pH is defined as the negative log10 of the hydrogen ion activity, although general chemistry texts commonly express it in terms of the hydronium ion the pH is calculated as 3.23.
What is pH?In chemistry, the pH scale is used to define the acidity or basicity of an aqueous solution. Historically, pH stood for "potential of hydrogen."
The pH values of acidic solutions are typically lower than those of basic or alkaline solutions.
It is provided that,
{H3O+} = 5.79 X 10^-4M
We know that pH is basically the negative log10 of the hydrogen ion.
this means,
Thus, pH = -log10[H3O+]
Then putting the value of [H3O+]
pH = -log10 (5.39 x 10^-4)
pH = 3.23
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Complete question
PH is defined as the negative log10 of the hydrogen ion activity, aH+, although general chemistry texts commonly express it in terms of the hydronium ion concentration. Thus, pH = −log10 [H3O+], where [H3O+] represents the concentration of H3O+ in units of moles per liter (M). Calculate the pH or [H3O+], as required, for the following solutions. {H3O+} = 5.79 X 10^-4M
what kind of noncovalent interaction is typified by interactions between two molecules that are so close together that they can experience weak attractive forces bonding them together?
Van der Waals forces. Van der Waals forces are very weak forces between two very close surfaces.
Forces of van der Waals. When two surfaces are very close to one another, van der Waals forces are very weak.
Is the Van der Waals weak?In gases, liquefied and solidified gases, and nearly all organic liquids and solids, neutral molecules are drawn to one another by van der Waals forces, which are relatively weak electric forces.
Van der Waals interactions are nonionic forces that have a comparatively low energy of 0.5 to 1 kcal/mol.
The covalent link from its less electronegative Neighbour atom tends to drive the electron cloud toward neutral molecules with electronegative atoms like oxygen and nitrogen.
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An atom has 20 protons and has a +2 charge.
How many electrons does this atom have?
A 5. 00 gram sample of lead and a 3. 20 g sample of iron are placed into 367 ml of water. What will be the new volume level of water in units of ml? the density of lead is 11. 34 g/cc and the density of iron is 7. 874 g/cc. Do not enter ""ml"" as part of your answer.
The water now has a volume of 367.84 ml.
How to find the new volume?Density = Mass/Volume
The mass of the lead sample = 5 gm
The mass of the iron sample = 3.2 g
The volume of the water = 367 ml
The density of lead = 11.34 g/cc
The density of iron = 7.874 g/cc
The volume of the lead = Mass of lead/Density of lead = 5/11.34 = 0.441ml
The volume of lead is 0.441ml.
The V of iron is,
V = m/d = 3.2/7.874 = 0.406 ml
The volume of iron is 0.406 ml.
The water sample's new volume level is
367 + 0.441 + 0.406 = 367.84 ml, where
the new volume equals the original water volume plus the lead and iron amounts.
The water now has a 367.84 ml new volume level.
As a result,
367.84 is the new volume level of the water without the unit.
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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 !
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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Which TWO statements CORRECTLY describe a trend in physical or chemical properties for the elements shown in the Periodic Table?
Responses
A>The chemical properties of all the elements present in each period are similar.
B>The chemical properties of all the elements present in each period are similar.
C>The chemical properties of the elements present in each group are similar.
D>The chemical properties of the elements present in each group are similar.
E>The ionic radii of elements increases moving from right to left across a period of the Periodic Table.
F>The ionic radii of elements increases moving from right to left across a period of the Periodic Table.
D and E are correct statements
a(n) is the fundamental particle of matter, and any further breakdown of this would result in loss of the properties that are unique to its element.
An Atom is the fundamental particle of matter, and any further breakdown of this would result in loss of the properties that are unique to its element.
What is an atom?The smallest piece of matter with all of an element's chemical properties is an atom. Neutrons, protons, and electrons make up an atom's three constituent parts. The atom's nucleus is a compact, positively charged core made up of protons and neutrons, and is surrounded by an electron cloud, which is made up of negatively charged electrons.
What are the properties of an atom? The mass of protons and neutrons is roughly equal to 1.67 × 10−24 grams defined as one atomic mass unit. Because electrons only weigh 9.11 × 10−28 grams or about 1/1800 of an atomic mass unit. they have a far lower mass than protons.The protons in an atom are indicated by the atomic number. How many protons and neutrons there are in an atom determines its atomic mass. The number of neutrons can differ amongst atoms of the same element, even while all of their protons are the same. Isotopes are the name given to such atoms.The number and configuration of electrons within the electron cloud determine how an atom will behave chemically.The atomic number (number of protons) and the number of neutrons(neutron number) together determine an element's nuclear properties (atomic mass, nuclear cross-sections).
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Energy and Temperature Activity Worksheet
Instructions: Follow the directions below to complete part one and part two of this activity. You will submit both parts once completed.
Note: You are not performing the experiment—only designing it.
Introduction
The purpose of this assignment is to design an experiment that another student could follow and use to test whether land or water heats faster.
You will complete the following:
Part One: Experimental Design. Plan out an experiment by answering the guiding questions below.
Part Two: Design a Lab Report. Write the outline of a lab report so that another student could complete the experiment by using the materials listed below:
sand
water
heat lamps
thermometers
cups
Part One: Experimental Design
Use these guiding questions to create the experiment. Answer each question below:
What hypothesis will the experiment test?
expecting which will be faster land or water
What are the variables?
dependent
What purpose would the sand serve?
What purpose would the water serve?
What purpose would the heat lamps serve?
What purpose would the thermometers use?
How can you use these materials to test whether land or water heats faster?
How would you compare whether land or water heats faster?
Within a 24-hour period, at what three points should the temperature be taken? Why?
What would an effective conclusion need to include?
Part Two: Design a Lab Report
Once you have designed the experiment, you must write out the instructions so another student could act as the experimenter and follow them. Fill in the following elements of this lab report as described in italics below.
Lab Report
Objective
Explain the purpose of your lab.
Procedure
List the experiment procedures. Some steps have been filled in for you. You may need to adjust the numbers to match the steps you decide on.
Identify the variables.
Write out your hypothesis in an if/then format.
Gather your materials.
Analyze the data.
Analyze the data.
Data Analysis
Label a data table so that the experimenter can record observations for the sand and water temperatures at various points.
Conclusion
Explain what the experimenter should include in this section to show how the data proved the hypothesis.
Answer:
the experimenter should include an observater and an analysis
Explanation:
Answer:
The part 1 of the experiment designed to test whether land or water heats faster is answered below for each and every questions.
1 ) The experiment will test whether land or water heats faster
2 ) The independent variable of this experiment is sand, water and heat lamps and the dependent variable is the rate of heat transfer.
3 ) The sand represents the land part of the hypothesis
4 ) The water represents the water body part of the hypothesis
5 ) The heat lamps represent the sun which provided heat
6 ) The thermometers will be used to measure the temperature
7 ) It could be set up such a way that the sand and water receives equal amount of heat from the lamps for an equal amount of time.
8 ) The temperature can be measured using the thermometer to see whether the land or water has gained more heat. Whichever has gained more heat, heats faster.
9 ) Within a 24-hour period, the three points, the temperature be taken are at 8 hours, 16 hours and 24 hours. Because the temperature should be taken at a steady rate of time.
10 ) An effective conclusion would include the facts that proves the hypothesis.
Therefore, the part 1 of the experiment designed to test whether land or water heats faster is answered above
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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.
Calculate the average atomic mass of the following isotopes of Magnesium:
Isotope: % Abundance
Magnesium-22.5 78%
Magnesium- 25.3 13%
Magnesium-24.6 9%
The average atomic mass of isotopes of magnesium is 23.4 amu
To get the average atomic mass we have to multiply mass of each isotopes to the % of abundance and then add and divided by 100.
Isotope of magnesium given as,
1) 22.5 amu has an abundance of 78%
= (22.5 × 78 ) = 1755.0
2) 25.3 amu has an abundance of 13 %
= ( 25.3 × 13 ) = 328.9
2) 24.6 amu has an abundance of 9 %
= ( 24.6 ×9) = 221.4
The average atomic mass of magnesium will be
= (1755.0 + 328.9 + 221.4 ) /100
= 23.4 amu
Thus,The average atomic mass of isotopes of magnesium is 23.4 amu
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I NEED HELP ASAP
When the polyatomic ion (SO2)-2 combines with the iron (III) ion, Fe+3, the formula for the compound is...
Select one:
a. FeSO4
b. Fe2SO4
c. Fe2(SO4)3
d. Fe3(SO4)2
Answer:
Iron(III) sulfate (AKA Fe2(SO4)3)
Explanation:
How many kilograms of dry air are in a room that measures 15.0 ft by 18.0 ft by 8.00 ft? Use an average density of air of 1.168 g/L. There are 30.48 cm in one foot.
(THIS IS A DIMENSIONAL ANALYSIS QUESTION)
The number of kilograms of dry air in the room that measures 15.0 ft by 18.0 ft by 8.00 ft is 71.44 Kg
We'll begin by obtaining the volume of the room. This can be obtained as follow:
Dimension = 15.0 ft by 18.0 ft by 8.00 ftVolume =?Volume = dimension
Volume = 15.0 ft × 18.0 ft × 8.00 ft
Volume = 2160 ft³
Multiply by 28.3168 to express in liter
Volume = 2160 × 28.3168
Volume = 61164.288 L
How to determine the mass of dry airVolume of room = 61164.288 LDensity of air = 1.168 g/LMass of dry air =?The mass of the dry air can be obtained as follow:
Density = mass / volume
Cross multiply
Mass = Density × Volume
Mass of dry air = 1.168 × 61164.288
Mass of dry air = 71439.89 g
Divide by 1000 to express in kilograms
Mass of dry air = 71439.89 / 1000
Mass of dry air = 71.44 Kg
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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.
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Where does a spring in a ball point pen or a pogo stick get its energywhen an object moves, where does the energy come from?
A Jumping motion a spring in a ball point pen or a pogo stick get its energy. Energy that a moving object has due to its motion is Kinetic Energy.
Is there a motion involved in jumping?The human body is no different than any other object in that it must obey the laws of physics, and Newton's laws of motion apply when jumping. To achieve the highest possible jump height, an athlete attempts to vertically accelerate his body as quickly as possible.A jump from a plié in rest is less effective than a jump that moves into and out of the plié in a single smooth motion. Jumps can also be done in a horizontal motion. Trajectories, or paths of motion through space, are produced by these moves. Friction and gravity are two of the many forces at work here.
Kinetic energy:
Kinetic energy (KE) is the energy of a moving body, which means it is essentially the energy of all moving objects. It is one of the two major types of energy, the other being potential energy, which is the stored energy within objects at rest.Start working the ability of kinetic energy to do work is perhaps its most important property. Work is defined as force acting in the direction of motion on an object. Work and energy are so inextricably linked that they can be used interchangeably.
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The energy is kinetic energy. In a jumping motion a spring in a ballpoint pen or a pogo stick gets its energy when an object moves.
What is kinetic energy?A moving object or particle's kinetic energy, which depends on both mass and speed, is one of its characteristics.
Kinetic energy is the force that propels motion, which can be seen in the movement of a particle, an object, or a group of particles.
A person walking, a baseball being thrown, a piece of food falling from a table, and a charged particle in an electric field are all instances of objects in motion that use kinetic energy.
Kinetic energy (KE) is determined by multiplying the mass of an item (1/2*m) by the square root of its velocity.
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If you were to do a 50% serial dilution, starting with a 10% concentration, how many dilutions would you have to make before getting to 2. 5% as your final concentration?.
The number of dilutions needed to be made before getting to 2.5 % as the final concentration would be 2.
We are given that, we have to do 50% serial dilution, which means that after every dilution the concentration reduces to half of its initial value.
On starting with 10% concentration, the concentration after one dilution would be 5%.
After diluting it two times, the final concentration would be half of 5% i.e 2.5%.
Thus, the number of dilutions needed to be made before getting to 2.5 % as the final concentration would be 2.
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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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One gram of sodium chloride will take longer to dissolve in a solution of 2 m glucose than in a solution of pure water. What is the most reasonable explanation for this observation?.
One gram of sodium chloride takes longer to dissolve in a solution of 2M glucose than in pure water. This is because diffusion happens faster in pure water than in a solution containing a solute i.e. glucose and thus it will take longer to dissolve as a result of large number of collisions.
If you were to put 1 gram of sodium chloride (NaCl) in a beaker of pure water, it would eventually dissolve. However, if you dissolve same amount of sodium chloride (NaCl) in a beaker of water containing 2 moles of glucose, sodium chloride would take longer to completely dissolve.
The reason for this is that, in a solution having more molecules, the sodium chloride would experience more collisions. Due to this, the rate of diffusion will slow down, and thus, sodium chloride will take longer to completely dissolve.
To put it simply, solutions having large number of molecules present exhibit slower diffusion rate than solutions with fewer molecules present. So, if you want the sodium chloride to dissolve quickly, the best way is to put it in a solution of pure water.
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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?
7 types of chemistry
Answer:
Organic Chemistry.
Inorganic Chemistry.
Physical Chemistry.
Analytical Chemistry.
Stereochemistry.
Biochemistry.
Geochemistry.
Forensic Chemistry.
Explanation:
Question:
7 types of chemistry
Answer:
Inorganic Chemistry, Physical Chemistry, Analytical Chemistry, Stereochemistry, Biochemistry, Geochemistry, and Forensic Chemistry.
Explanation:
Inorganic chemistry is a branch of chemistry that deals with inorganic compounds. Physical chemistry is the branch of chemistry concerned with the application of the techniques and theories of physics to the study of chemical systems. Analytical chemistry studies and uses instruments and methods to separate, identify, and quantify matter. Stereochemistry is the branch of chemistry concerned with the three-dimensional arrangement of atoms and molecules and the effect of this on chemical reactions. Biochemistry is the branch of science concerned with the chemical and physicochemical processes and substances that occur within living organisms. Geochemistry is the study of the chemical composition of the earth and its rocks and minerals, and Forensic chemistry is the application of chemistry and its subfield, forensic toxicology.
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5. Give the number of significant figures in each of the following.
a) 1.05 g
b) 0.0003040 mm
c) 29000 + 10 ft
d) 0.90 x 1045 L
e) the number of eggs (12) that make up a dozen
Answer:
a) 3 sig figs
b - d) 4 sig figs
e) 2 sig figs
Explanation:
When it comes to sig figs natural numbers count. Zeros only count when thay are in between natural numbers. For example 1.05 g has 3 sig figs and they are 1, 0, and 5. And 0.0003040 mm has 4 sig figs since the 4 trailing zeros before the 3 don't count.
3.How does the Figure 2 model connect to phenomena?
4.Do you think the model shown in Fiqure 2 is useful?
Explain why or why not.
The model as shown in useful in the explanation of reflection.
What is a model?The term model refers to that which represents reality. A model could be used for the purpose of explanation or for the purpose of prediction. It is used to show how there are connections in real life.
Now let us examine the model as shown. We can see that this is a model of reflection. The image of the ball can be seen on the mirror because light that falls on the ball is reflected towards the mirror.
This model is very useful in the description of the the phenomenon of reflection in the real life.
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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
A(n) is a deep valley on land that forms along a divergent boundary
Along the diverging boundary, a deep valley known as a rift valley develops.
What is valley ?A valley is a long, low terrain that frequently stretches between hills or mountains. It usually has a river or stream that flows from one end to the other.
The majority of valleys are created by rivers or streams eroding the land's surface over a very lengthy period of time.
A valley is a low area of ground between hills, particularly one through which a river flows.
In "triple junctions," a type of divergent boundary where three tectonic plates collide at angles of around 120°, several rift valleys are found.
Thus, along the diverging boundary, a deep valley known as a rift valley develops
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Al(NO3)3 + Na(OH)
Determine the type of reaction then complete the reaction, by writing the product.
High school chemistry
Answer:
Double replacement reaction, Al(OH)3 + Na3(NO3)
Explanation:
1) We can see that there are 2 compounds that contain 2 elements. This means we have a double replacement reaction.
2) Make the products
Take the elements on the outside of the equation
Al+3 and (OH)-1
criss cross the charges and you get
Al(OH)3
Now do the same with the remaining elements
Na+1 (NO3)-3
Na3(NO3)
Al(OH)3 + Na3(NO3)
The density (mass per volume) of most liquids increases as the __________ is lowered.
The density (mass per volume) of most liquids increases as the temperature is lowered.
When the temperature is lowered, most liquids become denser (mass per volume). Density decreases as temperature rises more. Density rises with a drop in temperature.
Most liquids expand in volume as the temperature rises, which causes the density of the liquids to decrease. Similar to this, as temperature drops, most liquids lose volume, increasing density.
The molecules of a liquid or gas move more quickly, collide, and spread apart when it is heated. The molecules take up more space because they are dispersed widely. Their density is lower. Whenever a liquid or gas is cooled, the opposite happens.
When a substance is heated, the molecules move faster and slightly farther apart, taking up more space and causing the density to decrease. When something is cooled, the molecules slow down and get a little closer together, taking up less space and becoming denser.
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Which feature do polar compounds have that nonpolar compounds lack?(1 point)
which feature do polar compounds have that nonpolar compounds lack?(1 point)
oppositely charged ends
oppositely charged ends
ions
ions
ends that have the same charge
ends that have the same charge
electrons
Polar molecules have positive and negative ends and stronger intermolecular forces of attraction as compared to Non - Polar molecules.
The compound that are held together by polar covalent bonds are known as Polar compounds. For Example water molecule, both the ends of water molecule are oppositely charged due to which intermolecular forces increases. Polar substances have relatively high melting points and boiling points.
When electrons are shared equally in a covalent bond there is no net electrical charge across the molecule , the molecule is known as Non-Polar Molecule. Example - [tex]O_{2} , N_{2}[/tex], etc.
Polar molecules have positive and negative ends and stronger intermolecular forces of attraction as compared to Non - Polar molecules.
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Answer:
Oppositely charged ends
Polyacrylamide is a water-soluble polymer whose aqueous solution containing 25 g/l develops an osmotic pressure of 0. 54 torr at 25◦c. Find the approximate molecular weight of the polymer sample.
By ideal gas approximation, the molecular weight of the polymer sample is 861471.83 grams.
We need to know about the ideal gas theory to solve this problem. The ideal gas is assumed that there is no interaction between particles in a gas. It can be determined by the equation
P . V = n . R . T
where P is pressure, V is volume, n is the number of moles gas, R is the ideal gas constant (0.0821 atm.L/mol.K) and T is temperature.
From the question above, we know that
ρ = 25 g/L
P = 0.54 torr = 0.00071 atm
T = 25⁰ C = 298 K
We can change the number of moles to density form
P . V = n . R . T
P . V = gr/(Mr polyacrylamide) . R . T
Mr polyacrylamide = ρ . R . T / P
Mr polyacrylamide = 25 . 0.0821 . 298 / 0.00071
Mr polyacrylamide = 861471.83 gram
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if a piece of rock has a volume of 0.73 l and a mass of 1524 g what is the density
Answer: 2.1 g/mL
Explanation:
The lifting force on an airplane's wing does which of the following?
bro pleas can explane me why is so hard
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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