The amount of energy that is needed to raise the temperature of 5.0 grams of lead from 25°C to 35°C is 6.45J.
How to calculate energy?The energy of a substance can be calculated by using the following formula:
Q = mc∆T
Where;
Q = quantity of heat absorbed or releasedm = mass of substancec = specific heat capacity∆T = change in temperature (°C)According to this question, 5.0 grams of lead needs to be raised from 25°C to 35°C, the amount of energy needed can be calculated as follows:
Q = 5 × 0.129 × {35°C - 25°C}
Q = 6.45J
Therefore, the amount of energy that is needed to raise the temperature of 5.0 grams of lead from 25°C to 35°C is 6.45J.
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What additional information, if any, would enable you to calculate the molality of a 7. 35 molar solution of a nonelectrolyte solid dissolved in water?.
Answer:
7.35
Explanation:
I answer is water is 7.35. Molar solution.
You have 1 m3 of wood and 1 m3 of aluminum. Which is heavier? prove your answer with calculation.
(hint: density = mass/ volume)
Using the density, Aluminum is heavier than wood.
We need to know about the density to solve this problem. Density is a unit that measures how dense an object is. Density can be measured by dividing mass by volume. It can be written as
ρ = m / V
where ρ is density, m is mass and V is volume
From the question above, we know that
V Al = V wood = 1 m³
ρ Al = 2.7 g/cc
ρ wood is less than 1 g/cc
The heavier object is represented by mass and also mass is proportional to the density. Hence,
m ~ ρ
In the same volume, aluminum density is greater than the wood density
ρ Al > ρ wood
m Al > m wood
Thus, Aluminum is heavier than wood
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Which of the following substances has bonds with the greatest ionic character?
A- CCl4
B- CuCl2
C- CaCl2
D- NCl3
The substance that has bonded with the greatest ionic character is CaCl₂; option C.
What are ionic bonds?Ionic bonds are bonds formed between elements of atoms by transferring an electron or electrons from an electropositive element to an electronegative element.
The greater the electronegative difference between the two atoms forming the bonds, the stronger the ionic character of the bond. This is because the ionic bond is a result of electrostatic forces of attraction between the oppositely charged ions.
Considering the given compounds:
CCl₄ - the bond between the atoms are covalent bondsCuCl₂ - the bond between the atoms are ionic bonds but the electronegativity difference is not very largeCaCl₂ - the bond between the atoms are ionic bonds and the electronegativity difference is quite largeNCl₃ - the bond between the atoms are covalent bondsHence, the bonds between CaCl₂ the greatest ionic character.
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Solution a is hypotonic with respect to solution b. What will happen when a cell from solution b is placed in solution a?.
When a cell from solution b is placed in solution a, water will enter inside the cell and it will swell up.
There are three kinds of solutions- isotonic, hypotonic, and hypertonic solutions.
When a solution has the same osmotic concentration as the cell, it is known as an isotonic solution. If a cell is placed in such a solution, water neither enters the cell nor exits from it and the cell remains the same in size.
When a solution’s osmotic concentration is more than a cell's, it is known as a hypertonic solution.
When a cell is placed in such a solution it loses water and shrinks.
When a solution’s osmotic concentration is less than a cell's, it is known as a hypotonic solution.
When a cell is placed in such a solution, water enters inside it and the cell swells up.
In the given situation, solution a is hypotonic with respect to solution b.
So, if a cell from solution b is placed in solution a, water will enter the cell and it will swell up.
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. How much heat is required to change 25.0 g of liquid Ethanol that is at a temperature of 158.7 K to a gas at 351.5 K?
The heat that is required is 11.85 kJ.
What is the specific heat capacity?The term specific heat capacity has to do with the amount of heat that could be supplied to an object that is required to raise the temperature of a unit mass of the substances by 1 degree Celsius.
Recall that heat is a form of energy that manifests itself through the occurrence of a temperature change.
Given that;
H = mcdT
m = mass of the ethanol
c = heat capacity of the ethanol
dT = temperature change
H = 25.0 g * 2.46 * (78.5 - (-114.3))
H = 11.85 kJ
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The km of an enzyme is 5. 0 mm. Calculate the substrate concentration when this enzyme operates at one‑quarter of its maximum rate.
1.67 mM is the substrate concentration when this enzyme operates at one‑quarter of its maximum rate.
It is given that the km of enzyme is 5.0 mM.
Enzyme is a protein based molecule that increase the rate of the given chemical reaction.
The conncetion in the middle of substrate and rate of reaction is calculated by the Michaelis-Menten Equation.
V = Vmax[S] / Km + [S]
where, V is initial velocity Km is measure of affinity and S is substrate concentration.
V = 0.25 [5.0] / 1/4 [5.0]
V =1.67
We apply one quarter in the given equation and the answer would be 1.67 mM
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If it takes 3.5 hours for the Hogwarts Express, moving at a speed of 120 mi/hr, to make it from Platform 9 and 3/4 to Hogwarts, how far apart are they.
Answer:
I think 3.5 times 120mi
Explanation:
9 -3/4=
Which statement best describes a scatterplot?
A. it shows data as a percentage of a whole
B. it shows data points connected by a single line
C. it shows quantitative data that relate two variables
D. it shows qualitative data grouped by similarities
According to the research, the correct option is C. A scatterplot identifies the problem and its variables showing quantitative data that relate two variables.
What is a scatterplot?It is a control and support tool that shows a geometric design that presents the existing links and the level of correlation between variables and how one variable influences another.
In this sense, given that it is a tool or graphic representation it is widely used in statistics, that helps to identify the possible association between two related sets of data, it seeks to correlate said variables in order to better control the process and improve it.
Therefore, we can conclude that according to the research, the correct option is C. A scatterplot identifies the problem and its variables showing quantitative data that relate two variables.
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An atom has 20 protons and has a +2 charge.
How many electrons does this atom have?
What is the expression for water?
Answer:
H20
Explanation:
Answer:
H20
Explanation:
Two hydrogen and 1 oxygen
Pls mark as brainiest
A sample of an element X is made up of 11% of the isotope X-17 and 89% of the isotope X-13.
Calculate the relative atomic mass, Ar, of element X.
The relative atomic mass, Ar, of element X is 1.43.
What is the relative atomic mass?The relative atomic mass can be calculated by multiplying the mass of the isotope by the total isotope's abundance x 100. It is the weight is grams of the number of atoms of the element.
Given, that isotopes X - 17 which is 11%
The isotopes X - 13 which is 89%
The relative atomic mass will be
Ar = ∑ isotopic mass × total isotope abundance 100.
Putting the values in the equation
11 / 100 x 13 / 100 x 100 = 1.43
Thus, the relative atomic mass, Ar, of element X is 1.43.
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Sally and Juan's science teacher challenged her students to build a paper airplane that would stay airborne for ninety seconds. The students have two days to design and test their planes. The assignment will end with a "fly-off."
First, Sally and Juan researched plane designs. Then they built their first plane. Each time they tested the plane, it took a nose dive straight into the floor. They changed the design by reshaping the nose of the plane and adding some weight to the tail. The plane flew, but did not get very far. After a few tries, their plane stayed in the air an average of twenty-two seconds.
Predict the outcome of succeeding trials if Sally and Juan had changed their throwing technique.
Answer: Make it extra pointy and the paper must be strong secure, but not too heavy or else is wont fly.
Explanation: it will work if you follow these steps:... BELIEVE IN YOURSELF!!! :)
Why is a geologist most likely to find metamorphic rock underground instead of on Earth's surface?
O The metamorphic rock would heat up too fast on the surface of Earth.
O There is less pressure beneath Earth's surface.
O Weathering and erosion prevents metamorphic rock from forming at Earth's surface.
O There isn't enough heat and pressure at Earth's surface.
Answer:C
Explanation: i did this !
A 5. 0 l flask containing o2 at 2. 00 atm is connected to a 3. 0 l flask containing h2 at 4. 00 atm and the gases are allowed to mix. What is the mole fraction of h2? report your answer to two decimal places.
The mole fraction of H₂ = 0.55
What exactly is a mole fraction?A mole fraction is a concentration unit. The mole fraction, which is represented by "X," measures the relative amount of solute and solvent in the solution. The mole fraction is the number of moles of a specific component in the solution divided by the total number of moles in the given solution.A mole fraction is the proportion of molecules of a single component in a mixture. For example, if the mole fraction of methane in gas is 0.90, then 90% of the molecules are methane. Because the quantity fractions are similar to mole fractions, the mixture is also 90% methane.
Applying the ideal gas law
P V = n R T
=P V/R T
NO₂ = (2atm) (5L)/ RT
NH₂ = (4atm) (3L)/ RT
Assume the temperature of the two gases remains the same before and after the mixing occurs. The mole fraction of H₂ is
XH₂ = nH₂ /[tex]n_{total}[/tex] = nH₂ / nH₂+ nO₂
= [tex]\frac{\frac{(4atm)(3L)}{RT}}{\frac{(4atm)(3L)}{RT}+\frac{(2atm)(5L)}{RT}}[/tex]
= [tex]\frac{(4atm)(3L)}{(4atm)(3L)+ (2atm)(5L)}[/tex]
= 0.545455
The mole fraction of H₂ = 0.55
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An unknown substance appears as a white powder
Answer:
How do you identify an unknown white powder?
Not only can Raman spectroscopy be used to identify unknown white powders rapidly, it can also be used to identify explosives (Figure 3) and other biochemical agents such as anthrax and mustard gas
Explanation:
The way that a person can be able to identify an unknown white powder as a compound or any element is by the use of Raman spectroscopy, With its use, one can know if they are explosives, biochemical agents or others.
How do you identify a powder?The other ways to identify them are:
Appearance - Utilize a magnifying glass to describe the powder's look.Texture - Feel the substance's texture by squeezing some between your fingertips.Smell - Without breathing anything, carefully smell the substance. Reaction to water - A drop of water should be added to a sample of each powder to see how it reacts.Therefore, The way that a person can be able to identify an unknown white powder as a compound or any element is by the use of Raman spectroscopy, With its use, one can know if they are explosives, biochemical agents or others.
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See full question below
How do you identify an unknown white powder?
Which types of molecules will be in the in the beaker
after the reaction?
select one:
Answer:
H20 only
Explanation:
It's because that When a chemical forms, It turns into a product. The product can't just float away, but byproducts can.
Eit
re
2. What new ideas do you have about the structure of the rock deep underground?
3. How could you use what you learned to explain why some mountains grow or move?
What new questions do you have now?
The structure of the rock deep underground determined by some theory by the scientists.
The majority of scientists think that rocks and minerals' constituent constituents are what cause layers to form. Rocks and minerals can "change state," or melt or crystallize to produce other rocks, at certain pressures and temperatures.Different kinds of rocks "reflect" both body waves in various ways. This enables seismologists to distinguish between various rocks that are found deep inside the Earth's crust and mantle. For instance, deep underground oil resources can be found using seismic reflections.The following reasons are how we can explain why some mountains grow:Because of mountain erosion, the crust loses mass, raising the mountains.The balance between the mountains' vast weight and their buoyancy in the mantle is one of the factors influencing the height of the range.The following reasons are how we can explain why some mountains move:A process known as small scale convection occurs when mantle material sinks at a plate boundary and then flows upward farther away, pushing on the crust. Mountains can be moved by the slow but unstoppable movements, both gradually and through earthquakes or eruptions.To learn more about growing mountains visit:
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Which ONE of the following words is the ODD ONE OUT and WHY?
Mixture, Molecule, Compound, Element.
Needs to be 4 sentences at least lol
The odd one of the aforementioned substances is mixture because it is not a pure substance.
What are pure substances?A pure substance is a substance that has a fixed chemical composition. In chemistry, molecules, elements and compounds are all pure substances.
Molecules are pure substances and they contain one or more types of chemical elements i.e. two or more atoms held together by chemical bonds.
Compounds are substances formed by chemical bonding of two or more elements in definite proportions by mass.
Elements are the simplest chemical substances that cannot be decomposed in a chemical reaction or by any chemical means.
However, mixtures are substances made up of two or more substances that are not even in their chemical composition. Mixtures are impure substances.
Therefore, the odd one of the aforementioned substances is mixture because it is not a pure substance.
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the melting point of 4.0 g of sodium chloride is approximately 800 oc. what is the melting point of 2.0 g of sodium chloride under the same conditions? the melting point of 4.0 g of sodium chloride is approximately 800 oc. what is the melting point of 2.0 g of sodium chloride under the same conditions?
The melting point of 2.0g sodium chloride is: 400C
What is a melting point?The temperature at which an idealized pure substance can coexist in both its liquid and solid phases is known as its melting point. The temperature at which a substance transforms from a solid into a liquid is known as its melting point. Melting happens for a pure substance at a single temperature. The melting points published in the literature have all been measured at a pressure of 1 atm of air unless otherwise specified.
Given that,
The melting point of 4.0g sodium chloride=800C
Setting up a proportion:
4X = 800(2)
4X = 1600
X = [tex]\frac{1600}{4}[/tex]
X = 400
Therefore, the melting point of 2.0g sodium chloride is 400C.
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Please hurry and tell the answer to:
If a 20.0 g sample of sucrose (table sugar) has 1.30 g of Hydrogen, what would be the expected mass of Hydrogen in a 100.0g sample of sucrose?
Answer:
6.50 g of Hydrogen
Explanation:
We know that in every 20.0g of sucrose, there are 1.30g of hydrogen.
We now have 100.0g of sucrose. 100.0g is 5x larger than the 20.0g sample, which is a 5 : 1 ratio. Applying this ratio to the amount of hydrogen, we would have 5*1.3g of hydrogen in the 100.0g of sucrose.
5*1.3 = 6.5, so our answer is that there are 6.50g of hydrogen in 100.0g of sucrose.
Hope this helps!
Name some physical and chemical properties of hafnium.
Answer:
Physical Properties of Hafnium Hafnium is a shiny and silvery metal exhibiting ductile features. It is usually resistant to corrosion and exhibits similar chemical properties to that of zirconium.
Atomic Mass: 178.49 g.mol −
1Atomic Number: 72Symbol: Hf
Which of these substances is a compound?
A. acetic acid
B. carbon
C. chlorine
Answer: Acetic acid
Explanation: Chlorine and carbon are molecules, Acetic acid is a compound with the formula CH₃COOH
Choose of all the indicators of a chemical change. (A) Substance bends. (B) Chemical bonds are broken. (C) Unexpected change in temperature. (D) Odor change. (E) Producing a gas or fizzing. (F) Unexpected color change. (G) Chemical bonds are formed. (H) Precipitate (solid) formed. (I) Change is state of matter. (J) Substance dissolves into another.
Answer:
C,D,E,F,H,I,J are all basic observable indicators of chemical change
Explanation:
20 points!! please answer both correctly
B. The MOST plausible prediction and explanation of the ending mass is 3g of (AgCl + NaBr); matter is conserved so the total mass will be the same in the beginning and end.
What is the law of conservation of matter?
The law of conservation of matter states that mass cannot be created nor destroyed, but can be converted from one form to another.
When the law of conservation of matter or mass is applied in a chemical reaction we will observe the following;
the mass of the reactants and mass of products are conservedthe total mass of the reactants is equal to the total mass of the producteach component of the reaction is conservedno new element is createdFrom the given chemical reaction;
2 g of NaCl + 1 g of AgBr = ?AgCl + ? NaBr
Based on the law of conservation of matter, the total mass of the reactants (3 g) must be equal to the total mass of the product (3 g) because matter is conserved.
Thus, the MOST plausible prediction and explanation of the ending mass is 3g of (AgCl + NaBr); matter is conserved so the total mass will be the same in the beginning and end.
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How many molecules are in 2A1203? *
4 Molecules
6 Molecules
2 Molecules
5 Molecules
????
Answer:
6
Explanation:
2A is a molecule Argon bond. so, it's 1 + 2+ 3
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ents
cker
An element is dull, brittle and a poor conductor of heat and electricity.
What letter would be a likely place for this element to be located on the
Periodic Table.
OC
OA
OB
OD
A
D
B C
An element is dull, brittle and a poor conductor of heat and electricity therefore the letter would be a likely place for this element to be located on the Periodic Table is B which is the third option.
What is a Metalloid?These are referred to as semi-conductors and they are elements which have similar physical and chemical properties to that of metals and non-metals and a good example is Boron.
Boron has the symbol B and it is a dull, brittle element and also a poor conductor of heat and electricity which are examples of the properties of a nonmetals. It however conducts electricity under very high temperature.
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Calculate the degrees of unsaturation in a compound with the molecular formula c3h6 and draw two possible structures, including hydrogen atoms, for the formula.
The degree of unsaturation is 1, and the possible structures are propene and cyclopropane.
Because the compound doesn't contain any heteroatoms, the matter of calculating degrees of saturation is simply deducting the number of hydrogen atoms (6) from the one a three-carbon alkane would have (8) and dividing by two:
(8 - 6) / 2 = 1
Because a single degree of unsaturation means either a double bond or a ring, we can draw an example of each, sticking to the three-carbon formula. This way we end up with propene (double bond) and cyclopropane (ring).
In addition, these are the only structures possible for this molecular formula.
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Convert 0.00259 to scientific notation
Answer:
2.59 × 10^-3
move the decimal 3 spots to the right
Substance that increases [h ] and decreases ph when it dissociates in water is called a(n)?
The substance that increases [H+ ] and decreases pH when it dissociates in water is called an acid.
What are acids?Acids are substances that have lower than seven pH. They are sour in taste, and they dissociate into H+ ions in the water when dissolved in water. A strong acid is a hydrochloric acid, a weak acid is a nitric acid.
They have no electrons, just protons. They turn blue litmus paper to red. Furthermore, they react with metals to form hydrogen, and they react with a base to form salts.
Thus, the substance that decreases the pH when mixed with water is acid.
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Which chemical formula represents an organic molecule?
Responses
4H2O
4 uppercase H subscript 2 end subscript uppercase O
CCl2F2
uppercase C C lowercase l subscript 2 end subscript uppercase F subscript 2
Al2O3
uppercase A lowercase l subscript 2 end subscript uppercase O subscript 3
H2SO4
The chemical formula which represents an organic molecule is CCl₂F₂.
Organic compounds are those which have carbon atoms in them whereas inorganic compounds do not have carbon atom in it, but their are some exceptions.
Among the give responses,
4H₂O is an inorganic molecule, as there is no carbon in the molecular structure of H₂O. CCl₂F₂ is an organic compound which appears as gas. It contains carbon atoms in the chemical structure. It belongs to CFC compounds family. This organic molecule is formed by reaction of carbon tetrachloride with hydrogen fluoride gas in the presence of a catalyst, usually antimony pentafluorideCCl₄ + 2HF -----SbF₅-----> CCl₂F₂ + 2HCl
Al₂O₃ is an inorganic reagent. It does not have carbon atom. It is a covalent compound and not an ionic one.H₂SO₄ is an inorganic acid as it does not have carbon in it like other organic acids.To learn more about organic and inorganic,
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