Considering the definition of atomic mass, isotopes and atomic mass of an element, the percent natural abundance of antimony-121 and antimony-123 are 57.2% and 42.8% respectively.
Definition of atomic massThe atomic mass (A) is obtained by adding the number of protons and neutrons in a given nucleus of a chemical element.
Definition of isotopeIsotopes of an element are those where their atomic numbers are the same, but the number of neutrons is different.
Definition of atomic massThe atomic mass of an element is the weighted average mass of its natural isotopes.
The atomic masses of chemical elements are usually calculated as the weighted average of the masses of the different isotopes of each element, taking into account the relative abundance of each of them.
Abundance of each isotopeIn this case, you know that:
The mass of antimony-121 is 120.904 amu and a percent natural abundance of x% or x expressed as a decimal number.The mass of antimony-123 is 122.904 amu and a percent natural abundance of (100 -x)% or (1-x) expressed as a decimal number. [both abundances add up to 100%]The average atomic mass of Antimony is 121.76 amu.The average mass of antimony can be calculated as:
120.904 amu×x + 122.904 amu×(1-x)= 121.76 amu
Solving it is possible to calculate the value of x:
120.904 amu×x + 122.904 amu×1- 122.904 amu×x= 121.76 amu
120.904 amu×x + 122.904 amu- 122.904 amu×x= 121.76 amu
120.904 amu×x - 122.904 amu×x= 121.76 amu - 122.904 amu
(-2 amu)×x= -1.144 amu
x= (-1.144 amu)÷ (-2 amu)
x= 0.572 → x%= 57.2%
So, the value (1-x) is 1-0.572= 0.428 → (100 -x)%= (100-57.2)%= 42.8%
Finally, the percent natural abundance of antimony-121 and antimony-123 are 57.2% and 42.8% respectively.
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What is the ionic bond diagram of magnesium hydride?
The correct answer is MgH2.
In most cases, a metal reacting with a non-metal results in the formation of ionic compounds. As is common knowledge, metals always contain extra electrons on their outermost shells while non-metals never do. Metals thus transfer their electrons to non-metals, allowing both to reach the required octave.
Mg, a metal, contains two electrons in its outermost valence shell (E.C-2, 8, 2), while hydrogen, a gas, only has one electron in its outermost shell in the compound MgH2 (E.C- 1). As a result, Mg receives two electrons, achieving its stable state and satisfying the octet rule. On the other side, hydrogen gets one electron per atom, achieving the electrical structure of helium and becoming stable.
MgH2 is an ionic compound as a result.
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what is the average atomic mass, in amu, of a large sample of palomarium? (reminder: atomic masses of each isotope and their percent abundances are given in the student handout)
The average atomic mass in amu of a large sample of the isotope Palomarium- 46:46.00159 amu
What is the average atomic mass?The weighted average mass of the atoms in a naturally occurring sample of an element is the average atomic mass, also known as atomic weight.
Unified atomic mass units are typically used to express average masses (u).
Let
46Palomarium = 46.00159 = x%
48Palomarium = 47.98621 = 1-x%
⇒ 46.9939 = (46.00159)x + (47.98621) (1-x)
⇒ 46.9939 = -1.98462x + 47.98621
⇒-0.99231 = -1.98462x
⇒ x = 0.50 = 5.%
and 1-x = 1-0.50 = 50%
avg atomic mass = 46.00159 (0.5) + (47.98621) (0.5)
= 46.9939 amu
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which is more efficient , the incandescent or fluorescent bulb
Fluorescent bulb is the more efficient one.
An electric bulb which has a filament inside it and the electricity passes through the filament and it get heated an it glows. The condition inside the bulb is vacuum or inert gas. This is an incandescent bulb. they uses a lot of energy.
Fluorescent bulb is a mercury vapour low pressure, gas discharge lamp which will use less energy and fluoresce to produce visible light. So in this the electric current will cause the gas to get exited and there is a production of UV light which causes the coating on the inside of the lamp to glow..
Fluorescent bulb is the more efficient that the incandescent bulbs. They also have more life span than incandescent bulbs.
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(01.07 MC)
A student compares the boiling point of substances having different intermolecular forces. Which scientific problem is the student most likely investigating?
Group of answer choices
A:Is boiling point affected by the strength of particle attraction?
B:Is boiling point correlated to melting point?
C:Is boiling point affected by the mass of the sample?
D:Is boiling point the temperature at which a substance changes its state?
The scientific problem that the student is trying to investigate is the boiling point affected by the strength of particle attraction. So the correct option is A.
What is the boiling point?
A liquid partially vaporises into the airspace above it at any temperature up until the vapour the liquid's pressure at that temperature, which is a characteristic value. The vapour pressure rises as the temperature rises, and when the liquid reaches the boiling point, vapour bubbles develop inside the water and come to the surface.
A liquid's boiling point changes depending on the pressure being applied; the normal boiling temperature is the point at which the vapour pressure is comparable to the average atmospheric pressure at sea level (760 mm [29.92 inches] of mercury). Water boils at sea level at 100° C (212° F). Lower boiling point temperatures are seen at greater elevations.
Therefore, the correct option is A.
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Help someone ASAP!! Giving Brainliest!!!
1. Which element is a transuranium element?
A. thorium
B. einsteinium
C. erbium
D. neodymium
B. Einsteinium
Transuranium elements are the elements after the number 92 in the periodic table.
Which two words best complete this sentence: When wood burns it is converting chemical _________ energy stored in the wood into ________________ energy and light and sound of the fire.
potential, even greater potential
conduction, convection
potential energy, kinetic
kinetic energy, potential
Answer:
It would be C, Potential energy, kinetic.
Explanation:
4. Metal X forms two different chlorides A and B, if 12.7g of chloride A and 16.3g of chloride B contain 7.1g and 10.7g of chlorine respectively. Show that the figures agree with the law of multiple proportions. Write their formulae.
The formulae of the metal according to the law of multiple proportions are XCl₂ and XCl₃, and X is Fe so FeCl₂ and FeCl₃
We have the two chlorides that are XyClw and XyClz. We have to show that the ratios w to z are in small whole numbers.
Compound A = 12.7 g X and 7.1 g Cl, then X must be 5.56 g
Compound B = 16.3 g X and 10.7 g Cl, then X must be 5.56 g.
7.1 x (12.7/16.3) = 5.53 g Cl for each gram of X
10.7 x (12/7/16.3) = 8.34 g Cl for each gram of X. Then what is the ratio of the two Cl numbers: Now, divide both numbers by the smaller one. That is
5.53/5.53 = 1.00
8.34/5.53 = 1.508.
Rounding off 1.508 to 1.50, then you can see that 1.0 to 1.5 is actually 2 to 3 and those are small whole numbers. Within experimental error, the law of multiple proportions is proved to be true.
The compounds must be XCl₂ and XCl₃, and X is Fe so FeCl₂ and FeCl₃ are the compounds.
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Solve the following Scientific Notation Questions:
1) Express the following in standard form:
a) 5.2 x 10³
Answer:
The answer in standard form is 5200
Explanation:
It's extremely easy once you learn how to do it! Let me teach you! To change a number from scientific notation to standard form, move the decimal point to the left if you have a negative exponent, and to the right if you have a positive exponent. For example 5.2 × 10^-3 would be 0.0052 because the exponent is negative, so you over the decimal to the right however many times it says (whatever number the exponent is is how many places you move the decimal). So, the decimal is moved to the left 3 times, stopping it at 0.0052. And positive exponents are done the same way: only you move to the right and you will not get a decimal answer (its an actual number). You should move the point as many times as the exponent indicates. You answer should ever include the power of ten, because that only makes another problem to convert to standard form.
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To bake a cake I used 150 grams of flour, 70 grams of sugar, and 45 grams of milk. After going through a chemical change by baking the ingredients to make the cake, how many grams will the cake weigh? Will it be more, less, or equal to what we started with? Explain.
The cake should weigh 265 grams ordinarily. However, it could weigh less.
Chemical reactions and the law of conservation of massAccording to the law of conservation of mass, masses can neither be created nor destroyed during the course of chemical reactions. However, masses can be converted from one form to another.
Going by this law, the mass of the resulting cake from the illustration should be the cumulative mass of the ingredients of the cake.
However, during the process of baking, some mass might have been converted to gas and escaped into the atmosphere. Thus, the final cake may weigh less than the cumulative mass of the ingredients.
In the absence of conversion of mass to gas and no ingredient spillage during the entire process, the mass of the cake should be the cumulative mass of the ingredients.
Thus:
Mass of the cake = 150 + 70 + 45
= 265 grams
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What does Resources that control the size a population can reach are known as? Mean I need to study for a test
Answer: What does Resources that control the size a population can reach are known as? a limiting factor
Explanation: A limiting factor is anything that constrains a population's size and slows or stops it from growing. Some examples of limiting factors are biotic, like food, mates, and competition with other organisms for resources.
Is there a relationship between groups and periods on the periodic table and electron configuration?
Considering the relationship between groups and periods on the periodic table and electron configuration:
The groups in the periodic table determines how many electrons are found in the outermost shell of the atom of the element.The periods in the periodic table determine how many electron shells there are in the atom,What is electronic configuration?Electronic configuration is the arrangement of the electrons around the nucleus of an atom in orbits or shells or energy levels.
The electronic configuration of atoms depends on the groups and periods which the element belongs to.
The groups in the periodic table refer to the vertical columns in the periodic table while the periods in the periodic table refers to the horizontal rows.
The groups in the periodic table determines how many electrons are found in the outermost shell of the atom of the element.
The periods in the periodic table determine how many electron shells there are in the atom,
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An organic compound X, which contains carbon, hydrogen and oxygen only, has an M, of 85. When 0.43 g of X are burned in excess oxygen, 1.10 g of carbon dioxide and 0.45 g of water are formed. Find the empirical and molecular formulae of compound X
Emperical formula and molecular formula of compound X, both will be same that is C₅H₁₀O
An Empirical formula is the chemical formula of a compound that gives the proportions of the elements present in a compound but not the actual numbers or arrangement of atoms in a compound .
CₓHᵧOᶻ + nO₂ ---> CO₂ + H₂O
Moles of CO₂= 1.10/44 = 0.025 ( it comes from the Mass of CO₂ divided by Mr of CO₂)
moles of H₂O= 0.45/18 = 0.025 (Mass of H₂O divided by Mr of H₂O)
moles of compound X= 0.43/86 = 0.005 (Mass of X divided by Mr of X)
So we get the ratio = 1:5:5, respectively ratio of X burned, to CO₂ produced, to H₂O produced .
So the equation here becomes like this
=> CₓHᵧOᶻ + nO₂ ---> 5CO₂ + 5H₂O
Since ratio of compound X burned to CO₂ produced is 1:5, must be 5 carbon atoms in X if 5CO₂ produced.
Since ratio of compound X burned to H₂O produced is also 1:5, must be 10 hydrogen atoms in X if 5H₂O produced.
so the Emperical formula becomes C₅H₁₀O
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Protein x has an absorptivity of 0.4mlxmg^-1 at 280 nm. what is the absorbance at 280 nm of a 2.0mgxml^-1 solution of protein x?
The absorbance at 280 nm of a 2.0mg × ml^-1 solution of Protein x = 0.8
ExplanationProtein x = (0.4 Lmg-1cm-1) (2.0 mgmL-1) × (1)
= = 0.8
What is protein?The body depends heavily on proteins, which are big, complicated molecules. They are crucial for the structure, operation, and control of the body's tissues and organs and carry out the majority of their job within cells.
Proteins are made up of hundreds or thousands of smaller building blocks called amino acids that are linked together in lengthy chains. Proteins are created by combining 20 different types of amino acids.
Each protein has a distinct three-dimensional shape that is based on the amino acid sequence, which also determines the protein's particular function. Combinations of the three DNA building blocks (nucleotides), which are defined by the order of genes, are used to code for amino acids.
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Which bonding type results in stronger bonds? What is your evidence?
Answer:
Covalent bonds are the strongest bonds in nature and under normal biological conditions have to be broken with the help of enzymes. This is due to the even sharing of electrons between the bonded atoms and as with anything equally shared there is no conflict to weaken the arrangement.
Explanation:
Bonding electrons are described as electrons that participate in chemical bonds. Chemical bond, a strong attraction between atoms, ions, or molecules, might be the subject here. Atoms sharing electron pairs form a covalent or molecular connection. An attraction between the atomic orbitals of atoms in a molecule is called a bonding molecular orbital.
Which bonding type results in stronger bonds? What is your evidence?
A covalent bond is created when the difference between two atoms' electronegativities is too small for an electron transfer to occur and produce ions. Bonding electrons are collectively referred to as the electrons that are present between the two nuclei. The "glue" that binds the atoms into molecular structures is the bound pair.
It is the most powerful link. By sharing an electron, the two atoms in such a bond are joined together.
One Hydrogen atom with one valence electron and one Chlorine atom with seven valence electrons, for instance, make up the HCL molecule. In this instance, hydrogen and chlorine share an electron to create a single bond.
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One isotope of a metallic element has the mass number 64 and 34 neutrons in the nucleus. the cation derived from the isotope has 28 electrons. what is the atomic number?
One isotope of a metallic element has the mass number 64 and 34 neutrons in the nucleus. the cation derived from the isotope has 28 electrons. So the atomic number will be 30.
Mass number of isotope = 64
Number of neutrons = 34
So number of protons = 64 - 34 = 30
Hence atomic number of metal = 30
Thus metal is = zinc
Now as it is forming cation with 28 electrons it means it has lost two electrons so it must have a dipositive charge.
The symbol of metal ion will be Zn^+2
The number of protons in an atom's nucleus or the number of electrons in an electrically neutral atom is the atomic number of that atom. An atom of sodium, for instance, has 11 protons and 11 electrons. Therefore, the atomic number of the Na atom is equal to the sum of its protons and electrons, or 11.
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Why is the Sun's lifespan primarily based on its initial mass?
Answer:
Probably because there is more helium to burn. After billions of years there's only gonna be helium so no more of that firey energy.
I think....
A student drops a bottle of shampoo because his hands were slippery from the shampoo. Other than its slippery feel, what other tests would confirm which type of compound was in the shampoo? Choose the two statements that apply.
A. It tastes bitter.
B. It reacts with metals.
C. It turns red litmus blue.
D. It turns blue litmus red.
Answer:A student drops a bottle of shampoo because his hands were slippery from the shampoo. Other than its slippery feel, what other tests would confirm which type of compound was in the shampoo? Choose the two statements that apply.
A. It tastes bitter.
B. It reacts with metals.
C. It turns red litmus blue.
D. It turns blue litmus red
Explanation: ans B. It reacts with metals. mark me as brainliest
Answer these questions in the introduction of your Lab Report:
What is elasticity?
How is elasticity related to the bounciness of a ball?
What was the purpose of your experiment?
3. Answer these questions in the discussion and conclusion of your Lab Report:
What do your results indicate about the relationship between temperature and bounce height of a ball?
What are some sources of error in your experiment?
What are some ways that you could modify this experiment?
An elastic collision is one in which the system does not experience a net loss of kinetic energy as a result of the collision.
What is elastic collision?An elastic collision occurs when there is no net loss of kinetic energy as a result of the collision. Momentum and kinetic energy are both conserved in elastic collisions. Elasticity is a material body's ability to return to its original dimensions and shape after being deformed by external forces. When the rubber ball hits the ground, it is compressed or "squished," but because it is extremely elastic, it immediately returns to its original shape. The following are the goals of the elastic collision experiment: When a ball hits the ground, it can do one of four things: It may return at the same speed as when it first hit the ground.When the ball is heated, it becomes more elastic because the bonds can move more freely and thus stretch more than those in a cooler ball, resulting in less energy loss. As a result, the ball bounces higher. Take two identical balls. One is treated with heat, the other with cold water, and both are allowed to bounce from the same height.
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Explain why there are different colors of visible light
Question: GoodMorning: ) ✨ Explain why there are different colors of visible light ?
Answer: WAVELENGTHS OF VISIBLE LIGHT
As the full spectrum of visible light travels through a prism, the wavelengths separate into the colors of the rainbow because each color is a different wavelength. Violet has the shortest wavelength, at around 380 nanometers, and red has the longest wavelength, at around 700 nanometers.Light is made up of different wavelengths, or colors, and white light is a combination of all of them. When a ray of white sunlight hits a patch of beach ball, the paint absorbs most of the wavelengths. It reflects the rest. For example, if the patch is blue, it reflects the blue wavelengths and absorbs all the others.
Explanation: Here are the 7 from shortest to longest wavelength.
Violet - shortest wavelength, around 400-420 nanometers with highest frequency. ...
Indigo - 420 - 440 nm.
Blue - 440 - 490 nm.
Green - 490 - 570 nm.
Yellow - 570 - 585 nm.
Orange - 585 - 620 nm.
Red - longest wavelength, at around 620 - 780 nanometers with lowest frequency. Electromagnetic waves have many different wavelengths and frequencies that span a range known as the electromagnetic spectrum (Fig. 1.1). Light is a narrow range of electromagnetic waves that the eye can detect. Light of different wavelengths produces different perceptions of color.
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BROOO HELPPPP
Three students are given a 200g object to weigh on a balance and record the following masses: 150g, 151g, 150g. What can be said about the accuracy and precision of the balance?
In the given weigh on a balance and recorded masses 2.25g is the accuracy and precision of the balance
A balance used to weigh quantities to a very precise number, usually up to one milligram and accuracy is the balance related to the measurement uncertainty of each reading.
Here given data is three students are given = 200g weight and record the following masses = 150g, 151g, 150g
We have to calculate accuracy and precision of the balance = ?
So accuracy and precision of the balance = sum of data/no of measurement
Here sum of data means = 150g, 151g, 150g and no of measurement = 200g
accuracy and precision of the balance = 150g+151g+150g/200
accuracy and precision of the balance = 2.25g
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6. What must be done to observe the chemical properties of a substance?
O Change it into a different substance.
Be able to describe its hardness or luster.
Watch it melt from a solid into a liquid.
Change its shape into a different shape.
The statement that explains what must be done the observe the chemical property of a substance is as follows: Change it into a different substance (option A)
What is a chemical property of a substance?The chemical property of a substance is any of a material's properties that only becomes evident during a chemical reaction.
Chemical reaction is a reaction that typically involves the breaking or making of interatomic bonds, in which one or more substances are changed into others.
This suggests that chemical properties cannot be observed via change of state or phase but can only be observed when the substance changes into a different substance i.e. undergo a chemical reaction.
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A chemist has synthesized a greenish-yellow gaseous compound that contains only chlorine and oxygen and has a density of 7. 71 g/l at 36. 0°c and 2188. 8 mmhg. What is the molar mass of the compound?.
The molar mass of the compound is 67.5 g/mol which chemist has synthesized.
To find the molar mass of the compound,
Using ideal gas law, PV = nRT and can also be written as PM = dRT.
where,
P refers to the pressure which is measured in atmospheres (atm),
T refers to the temperature which is measured in kelvin (K),
R is the ideal gas law constant ,i.e, 0.0821 atm(L)/mol(K)
M is know as the molar mass (g/mol)
d is the density (g/L).
Given data :
P = 2.88 atm
d = 7.71 g/L
R = 0.0821 atm(L)/mol(K)
T = 36 C = 36+273 K = 309 K
According to the ideal gas law,
Formula to find the molar mass can be written as -
M = dRT
P
M = (7.71 x 0.0821 x 309)
2.88
M = 67.83 g
Therefore,
Molecular Formula = ClO₂
The molar mass of ClO₂ = 35.5+2 x 16 = 67.5 g.
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How would you describe the bond that exists between two oxygen atoms to make the o2 molecule? how many lone pairs are present on each individual oxygen atom?.
The bond that exists between two oxygen atoms to make the O2 molecule is described as two covalent bonds and two lone pairs of electrons are present on each individual oxygen atom.
A double bond in chemistry is a covalent bond between two atoms that involves four bonding electrons, rather than two as in a single bond.
In the oxygen molecule, O2, the oxygen atoms that make up the molecule are bonded together by sharing two pairs of electrons. Each oxygen atom has 6 valence electrons, if they share two of their valence electrons with each other, they each have 8 valence electrons.
In this way, the so-called octet rule is fulfilled, where atoms gain, lose or share electrons with other atoms to have 8 valence electrons and thus acquire a noble gas configuration.
What is an atom?The atom is the smallest part of the composition of matter, it is indivisible and is composed of a nucleus that has protons and neutrons, and around the nucleus there are the electrons.
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Water and rubbing alcohol have distinct properties and will react differently with the same substance. Observe these properties of water and rubbing alcohol: color, smell, and ability to dissolve salt. Record your observations in the table. To observe the solubility of salt in the liquid, put one-quarter teaspoon of salt into each container and stir. You may weigh out 1.5 g of salt on the electronic balance if you don’t have a one-quarter teaspoon measure.
[Please help!]
Water and alcohol has no colour. Water has no smell but alcohol smell like musty. Salt more dissolve in water as compared to alcohol.
What is the colour, smell and solubility of salt in water and alcohol?The water is colourless as well as odorless means it has no smell. Water can dissolve salt because the positive ion of water molecules attracts the negative chloride ions and the negative ion of water molecules attracts the positive sodium ions while on the other hand, the alcohol is colourless means it has no colour. The smell of alcohol is musty and sharp. Salt dissolves less in alcohol, because alcohol molecules have less ions as compared to water. Alcohol is non-polar like oil and salt is polar so it does not dissolve or very little in alcohol.
So we can conclude that Water and alcohol has no colour. Water has no smell but alcohol smell like musty. Salt more dissolve in water as compared to alcohol.
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Consider the gases h2, ne, o2, and ar. Put them in order of their decreasing rate of effusion.
The order of decreasing rate of effusion of gases is as follows :Hydrogen, Neon, Oxygen, and Argon.
Rate of Effusion :
The rate of effusion is inversely proportional to the square root of the molecular mass and the rate of effusion of a gas is directly proportional to the speed of the movement of gas.
It can be mathematically expressed as
rate of effusion ∝ 1
√M
This means that if two gases are at same pressure and temperature, the ratio of their rate of effusion is inversely proportional to ratio of square roots of mass. So, lighter gases will diffuse more quickly. The molecular masses of the gases are,
molecular mass of H₂= 2 g
molecular mass of O₂ =32 g
molecular mass of Ar = 39.94 g
molecular mass of Ne = 20.17 g
If we take ratios of these, for example between hydrogen and oxygen -
rate of effusion of hydrogen = √32 = 4
rate of diffusion of oxygen √2 1
Hydrogen effuses four times more rapidly than oxygen.
The rate of effusion is highest in Hydrogen and lowest in Argon.
The order of decreasing rate of effusion of gases is as follows:
Hydrogen, Neon, Oxygen, and Argon.
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If the density of gold is 19.3 g/cm3 and it has a volume of 10 cm3, what is its mass?
The mass of gold is 193g.
Density is defined as the mass of a material substance per unit volume. The equation for density is d = M/V, where d stands for density, M for mass, and V for volume. It is generally measured in grams per cubic centimeter. Density provides an easy way to calculate a body's mass from its volume or vice versa; the mass is equal to the volume multiplied by the density (M = Vd), whereas the volume is equal to the mass divided by the density (V = M/d).
Now, in the given question,
Density of gold = 19.3 g/cm³
Volume of gold = 10 cm³
Since, Density = Mass/Volume
Therefore, Mass of gold = Density of gold × Volume of gold
= 19.3g/cm³ × 10 cm³
= 193g.
Hence, the mass of gold is 193g.
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A problem is usually posed in the form of a:
a. question
b. experiment
c. method
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A problem that is usually posed in the form of a method.
What exactly is the scientific method? What are the stages of a scientific method?
A scientific method is a set of steps designed to assist you in solving problems and answering questions. The scientific method is comprised of the following stages:
Identifying and defining the problem - The problem chosen must have a limited scope and a clear goal; otherwise, a solution cannot be found. Creating a hypothesis - Hypothesis is the process of giving a logical justification for an observation. In the scientific method, it is a crucial step.Experimentation or hypothesis testing: After a hypothesis is put forth, it is tested through various types of research. Data gathering – After the problem has been observed and identified, data must be gathered in order to provide an answer to the pertinent question. Finding the outcome: The outcome could be direct or indirect. Repeating it is advisable. Retesting again: Repeated results are reliable and do not require additional validation.In order to apply the rule or law generally: The term "principle" or "law" refers to a thoroughly verified fact pertaining to a scientific finding or phenomenon. Its prediction has proven to be trustworthy.
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If a dextrose solution had an osmolarity of 100 mosmol/l, what percentage (w/v) of dextrose (mw = 198. 17) would be present?
w/v percentage of a dextrose solution with an osmolarity of 100 mosmol/L would be 1.9817%.
Because dextrose does not disassociate in an aqueous solution, the osmolarity of the solution is equal to its molarity, so we have a 100 mmol/L (or 100 mM or 0.1 M) dextrose solution. That means that, in 100 mL (0.1 L) of this solution, we have:
c = n/V, so n = c x V = 0.1 M x 0.1 L = 0.01 mol
n = m/M, so m = n x M = 0.01 mol x 198.17 g/mol = 1.9817 g of dextrose
w/v percentage would be:
100% x 1.9817 (g) / 100 (mL) = 1.9817%
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12.3 grams of sodium equals how many atoms of sodium?
According to Avogadro, one mole of a material consists :
6.022x10∧23 atoms. Avogadro's number is this. Use dimensional analysis to determine the number of atoms present in two moles of sodium.
Na x 2.0 moles
6.022⋅10
23g1
mol=1.20
10.24 Na atoms.
How is molar mass linked to moles?The mass of 6.022 10 23 atoms, molecules, or formula units make up one mole of a material, which is known as the molar mass. This value is given in grammes per mole.
The SI unit for calculating a material's amount is the mole. It is symbolised by the letter mol. The volume of material that includes the same number of distinct things is another name for it. The molar mass of a substance is its mass expressed in grammes per mole.
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"Ions and Isotopes Practice
plete the following:
. For each of the ions listed, identify the total number of electrons for each
1. A1+³
2. Fe*3
3. Mg2
4. Sn¹2
5. Co-²
6. Co
7. Lit¹
8. Cr+3
9. Rb-¹
10. Pt¹2
The electron is a subatomic particle with a negative one elementary charge electric charge. Due to their lack of known components or substructure, electrons, which are part of the first generation of the lepton particle family, are typically regarded to be elementary particles.
For each of the ions listed, identify the total number of electrons for each
Al+3 = 10Fe+3 = 23Mg-2 = 14Sn+2 = 48Co-2 = 29Co-3 = 30Li+1 = 2Cr+3 = 21Rb-1 = 38Pt+2 = 76You must keep in mind that when an ion bears a positive charge, the number of electrons is lower than the number of protons in order to compute the number of electrons in the positive-charged ion. Therefore, you must subtract the magnitude of charge (which is frequently expressed as a superscript on the right side of the symbol) from the atomic number or proton number in order to obtain the number of electrons.
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