On its website, the epa claims that sulfur dioxide levels have fallen by 85etween 1990 and 2016. calculate the percent decrease between these two years to determine whether this claim accurate.

Lauren needs the information like mass of each substance respect to its volume in order to estimate the density of each liquid that creates the layers of colors.

Lauren can calculate density by the formula

Density = Mass/ Volume

According to the densities, the liquid that has a density less than that of water, it will float in water.

Whereas the objects or liquids that have a density more than that of water, it will sink to the very bottom.

A liquid’s density is a gauge of how heavy it is relative to the amount being measured. The liquid that weighs heavier is denser if you weigh two liquids with similar volumes or amounts.

A substance that is less dense than water will float if it is gently introduced to the water’s surface. Like a solid, a liquid’s density is determined by dividing its mass by its volume, or D = m/v. Water has an average density of one gram per cubic centimeter.

Liquids have particles that are closely spaced. Liquids have high densities because, although being randomly arranged, they are tightly packed.

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Answer:

6.5  x  (  6.02x 10^23)=  3.913  x10^24

Explanation:

1. Li2CO3 is dissolved in beaker A

2. CaCl2 is dissolved in beaker B

3. When A and B are mixed is a white colour precipitate is formed of          

   CaCO3.

4.  The sum of the coefficients of the net ionic equation is 0.

What is precipitation reaction?

In a precipitation process, two soluble salts in aqueous solution mix, and one of the byproducts is an insoluble salt known as a precipitate.

The precipitate can be removed from the liquid by centrifugation, decantation, or filtration, or it can remain suspended in the solution and fall out on its own. The term "supernate" refers to the liquid that is left over after a precipitate occurs.

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15. F

16. E

17. H

18. B

19. G

20. i

21. A

22. C

23. D

You're welcome :)

1. Sulfur is yellow (chemical)

2. Petroleum gas ignites when exposed to air and fire (chemical)

3. A diamond is a rated a 10 on the Mohs hardness scale (physical)

4. Rubidium has a density of 1.53 g/ml (physical)

5. Hydrogen has a mass of 1.00784 g (physical)

6. melting point of water is 32 degree F (physical,)

7. Copper can be transformed into wire. (physical).

8. 5 ml of water. (physical)

9. Zinc metal reacts quickly with hydrochloric acid to produce Hydrogen gas (chemical)

10. The element sulfur smells like rotten eggs.(chemical)

11. 5 grams of NaCl. (physical)

12. Aluminum is flatten to make aluminum foil (physical).

13. Your old bicycle has rusted (chemical).

The major difference between a physical and chemical change is that a chemical change involves the formation of entirely new substance while a physical change does not create a new substance.

Classification of the substances into physical and chemical substance

1. Sulfur is yellow (chemical, change in color through air reaction is chemical change)

2. Petroleum gas ignites when exposed to air and fire (chemical, combustion is chemical change)

3. A diamond is a rated a 10 on the Mohs hardness scale (physical, no new substance is formed)

4. Rubidium has a density of 1.53 g/ml (physical, no new substance is formed)

5. Hydrogen has a mass of 1.00784 g (physical, no new substance is formed)

6. melting point of water is 32 degree F(physical, no new substance is formed)

7. Copper can be transformed into wire. (physical, no new substance is formed).

8. 5 ml of water. (physical, no new substance is formed)

9. Zinc metal reacts quickly with hydrochloric acid to produce Hydrogen gas (chemical, new substance is formed)

10. The element sulfur smells like rotten eggs.(chemical, new substance is formed which is hydrogen sulfide)

11. 5 grams of NaCl. (physical, no new substance is formed)

12. Aluminum is flatten to make aluminum foil (physical, no new substance is formed).

13. Your old bicycle has rusted (chemical, new substance is formed)

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In the given redox reaction, the reducing agent is Cd (s).

When a chemical species "donates" an electron to an electron receptor, it is referred to as a reducing agent in chemistry (also referred to as a reductant, electron donor or reducer).

A reducing agent, which is often in one of its lesser oxidation states, serves as the electron donor. The loss of one electron in the redox reaction results in the oxidation of a reducing agent.

At the anode, oxidation reaction occurs:

[tex]Cd (s) \rightarrow Cd^2^+ (aq) + 2e^-[/tex]

At the cathode, reduction reaction occurs:

[tex]2Li^+ (aq) + 2e^- \rightarrow 2Li (s)[/tex]

The overall redox reaction is:

[tex]Cd (s) + 2Li^+ (aq) \rightarrow Cd^2^+ (aq) + 2Li (s)[/tex]

As it is known that the reducing agent is the one that undergoes oxidation in a redox reaction, therefore, Cd (s) is the reducing agent.

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Red gold is a gold‑copper alloy used to make jewelry.

Red gold is an alloy created by combining pure gold and copper without any or very little silver.

Here the percentage by mass of gold

= (100/9.47) × 5.71832496

= 60.3835794 %

The percentage by mass of copper

= (100/9.47) × 3.75167504

= 39.6164207 %

The pieces of jewelry ( weight 9.47g) contains 60.3835794 % Gold and 39.6164207 % copper.

What is red gold?

Red gold is an alloy created by combining pure gold and copper without any or very little silver.

Since gold is yellow—at least pure gold is—there is no such thing as red gold, the phrase "red gold" is truly an oxymoron.

A homogenous blend of two or more metallic elements is referred to as an alloy. Alloys are valuable because they can be designed to have unique properties that are impossible to achieve with pure metals. Silver and copper are the two ad metals that are used most frequently in gold alloys. In the past, the majority of gold alloys were composed of copper, silver, and all three metals, along with other trace metals. These mixes typically yield a pleasing yellow hue that resembles pure gold.

Let's assume the pieces of jewelry (weight 9.47g) contains X g gold and  Y g copper.

Now according to the question,

X+Y = 9.47 .......... (1)

Again we know that, density= mass/volume

So,

      X/19.3 + Y/8.96 = 0.715   ............. (2)

Or,  X/19.3 = 0.715 - Y/8.96

Or,  X = 13.7995 - 19.3Y/8.96

If we put the value of X in the equation (1). Then

     13.7995 - 19.3Y/8.96 + Y = 9.47

Or, Y(19.3/8.96 - 1) = 4.3295

Or, Y = 4.3295 /1.15401786

Or, Y = 3.75167504

Now, from equation (1).

     X+ 3.75167504 = 9.47

Or, X = 5.71832496

Here the percentage by mass of gold

= (100/9.47) × 5.71832496

= 60.3835794 %

The percentage by mass of copper

= (100/9.47) × 3.75167504

= 39.6164207 %

The pieces of jewelry ( weight 9.47g) contains 60.3835794 % Gold and 39.6164207 % copper.

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The mass number [tex]_{17} Cl^{35}[/tex]   is  35.

The mass number  [tex]_{17} Cl^{37}[/tex]   is  37.

isotopes of [tex]_{17} Cl^{35}[/tex]   contains. and isotopes   [tex]_{17} Cl^{37}[/tex] contain.

protons=17                                              protons= 17

neutrons=  18                                          neutrons=20

electrons= 17                                           electrons=17

Isotopes are two or more atom types that share the same atomic number (number of protons in their nuclei) and position in the periodic table (and, therefore, belong to the same chemical element). However, isotopes have different nucleon numbers (mass numbers) because they have varying numbers of neutrons in their nuclei. All isotopes of a given element have nearly identical chemical properties but differ in terms of atomic mass and physical characteristics.

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If the components have boiling points that are significantly different from one another, a straightforward distillation is utilized.

What is distillation process?

The technique of selectively boiling and condensing to remove the constituents or chemicals from a liquid mixture is known as distillation, or classical distillation. Heating solid materials to create gaseous products is known as dry distillation.

Distillation is the process of dividing up a mixture into its constituent parts according to their various boiling points. Alcohol purification, desalination, crude oil refinement, and the creation of liquefied gases from air are a few applications for distillation. In the Indus Valley, distillation has been used by humans at least since 3000 BC.

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The probability of getting 2 nickels, 2 dimes, and 1 quarter is; 0.1264

The area of mathematics known as probability deals with numerical descriptions of how likely it is for an event to happen or for a claim to be true. The probability of an occurrence is a number between 0 and 1, with 1 representing certainty and 0 representing impossibility of the event.

 The higher the probability of an event, the more probable it is to occur. Tossing a fair (unbiased) coin is a straightforward illustration. Since there are no other possible outcomes and the coin is fair, the probability of both "heads" and "tails" is half. Since there are no other conceivable outcomes, the probability of either "heads" or "tails" is equal to one.

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Answer:

The three tests to determine whether the solid is ionic or molecular compound are explained below

What is a Compound?

Chemical substances known as compounds are made up of two or more elements that are bonded chemically in a certain order. Chemistry is the study of the chemical, physical, and structural characteristics of material entities. Realizing that not all gases, liquids, and solids are created equal is crucial.

Explanation:

Firstly, the sample of the substance is taken in a test tube and heated over a flame. If the substance melts, then it is a covalent simple molecular compound and if no melting occurs then it may be either ionic or covalent ionic compound.

Secondly, Dissolve the substance in water or any other polar solvent. If it dissolves, then it can be either ionic or covalent simple molecular compound.

Next, electrolysis can be performed with the aqueous solution, if sample remains unmelted, dissolved in water and conducts electric current, then it is an ionic compound.

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Answer:

-5

Explanation:

For what I did was:

Switch the numbers

(35-33)

Do the math

Then add a negative because the smaller number is first meaning it will be a negative number

Answer:  m = 179.4 g

Explanation:

Answer:

26.5385

Explanation:

The molality of the solution is 3.6 molal

The boiling point is the temperature at which the pressure of the system is equal to the atmospheric pressure. Now we know that freezing point depression is one of the colligative properties.

We have that;

ΔT = K m i

ΔT = Freezing point depression

m = molality of the solution

i = Van't Hoff factor

i =1 because the solute is molecular

ΔT = 5.12 oC/molal * m * 1

We can get ΔT from; Freezing point of pure solvent - Freezing point of solution

=  5.49 °c - ( -13.0 °c) = 18.49°c

m = ΔT /k * 1

m = 18.49°c/5.12 oC/molal

m = 3.6 molal

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Answer:

Fe2O3 + 2Al -> 2Fe + Al2O3

Two substances, a and b were heated. Both substances change color. when cooled, both substances return to their original colors.

Changes within the size or form of matter are examples of physical change. Physical changes include transitions from one state to a different , like from solid to liquid or liquid to gas. Cutting, bending, dissolving, freezing, boiling, and melting are a number of the processes that create physical changes.

Physical changes occur when objects or substances undergo a change that doesn't change their chemical composition. This contrasts with the concept of chemical process in which the composition of a substance changes or one or more substances combine or break up to form new substances.

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Glycine is the only amino acid that is not optically active because it does not have a carbon chiral center.

The simplest amino acid is glycine. Because it is the only amino acid without an asymmetrical carbon atom, it differs from all the other amino acids. Glycine is therefore optically inactive. No stereoisomers exist in it. This amino acid is necessary for the manufacture of bile acids, porphyrins, creatine phosphate, and other amino acids as well as nucleic acids.

When compared to the other amino acids, glycine is integrated into proteins and enzymes at a rate of 7.5%, making it the second most prevalent amino acid on a molar basis. Glycine shares a similar ability to block neurotransmitter impulses in the central nervous system with gamma-aminobutyric acid and glutamic acid.

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Pepsin Pearls helps digest proteins in the stomach.

Here are some important pepsin advantages:

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Answer: samples of gaseous argon and solid iron in the same container

The rate of effusion and  the square root of molar mass is inversely proportionate .

The lighter a gas is, the quicker it will rave; the heavier a gas is, the quieter it will effuse. Of all the choices, helium (He) has the lowest molecular weight (atomic weight in this case), so it will have the most elevated rate of effusion.

The molar mass of nitrogen is more inferior than the molar mass of oxygen. Hence, the rate of effusion of nitrogen is more elevated than the rate of effusion of oxygen.

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The statement 'A subjective question deals with opinions, morals, and emotions and is not suited for science' is the explanation of why a subjective question is inappropriate for the scientific procedure (Option 4).

Opinions are inaccurate for the scientific method because any subjective point of view may bias the process to obtain knowledge, which always must be tested by experimentation.

In conclusion, the statement 'A subjective question deals with opinions, morals, and emotions and is not suited for science' is the explanation of why a subjective question is inappropriate for the scientific procedure (Option 4).

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Answer:

B. Energy that is transformed is neither destroyed nor created.

Hope this helps :)

Explanation:

This is what the Law of Conservation of Energy says, "Energy that is transformed is neither destroyed nor created."

The final temperature of the water is 29 degrees.

What is heat energy?

The results of the movement of minute particles known as atoms, molecules, or ions in liquids, solids, and gases are nothing but heat.  heat can be transferred from one substance to another and the flow because of the temperature difference between two objects is known as heat.

It is given that,

Mass of sample of water, m = 52 grams

Initial temperature, Ti = 10 degree

Heat absorbed, Q = 4,130 J

The specific heat of water is 4.184 J/(g C)

So,  the ultimate temperature of the water is 28.98-degrees.

The option C is correct.

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The following as an element, a compound, a homogeneous mixture, or a heterogeneous mixture:

(a) a milkshake: heterogeneous mixture

(b) air in a bottle: homogeneous mixture

(c) concrete: heterogeneous mixture

(d) helium gas: element

Whether a mixture is solid, liquid, or gaseous, homogeneous mixtures have the same ratios of their component constituents throughout a particular sample. Its composition stays the same throughout. There is just one observable phase of substance in a homogeneous mixture.

Due to the dispersion of fat particles throughout the milk and the fact that sugars are dissolved in the water portion, milk is used as an example of both a homogeneous mixture and a heterogeneous mixture.

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The complete question is -

Classify each of the following as an element, a compound, a

homogeneous mixture, or a heterogeneous mixture:

(a) helium gas:

(b) a milkshake:

(c) air in a bottle:

(d) concrete:

All possible types of intermolecular forces that can form between particles of :

(a) CS2: London dispersion forces

(b) CH2Br2: Dipole-dipole interaction and H-bonding

What are intermolecular forces?

Intermolecular forces, frequently abbreviated to IMF, are the appealing and repulsive forces that stand up among the molecules of a substance. These forces mediate the interactions among man or woman molecules of a substance. Forces additionally exist among the molecules themselves and those are together called intermolecular forces. Intermolecular forces are specifically answerable for the bodily traits of the substance. There are 5 varieties of intermolecular forces. They are as follows-

Thus, al the types of intermolecular forces possible between particles of :

(a) CS2: London dispersion forces

(b) CH2Br2: Dipole-dipole interaction and H-bonding

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The Elution sequence of compounds containing certain functional groups from the fastest to the slowest is hydrocarbons, olefins, ethers, halo carbons, aromatics, ketones, aldehydes, esters, alcohols, amines and acids.

Elution:

Elution in organic and analytic chemistry refers to the process in which one material is extracted from another material by washing it with the help of a solvent.

In an elution sequence, regardless of the polarity of the compounds, the solvent which is more polar, its chemicals elutes faster. Therefore, amending the polarity of the solvent will not change the order of elution of compounds. It might seem contradictory as a polar solvent seems to convey polar compounds beyond the non-polar compounds.

Contemplating the solvents and the chemicals will fight for the stationary phase locations conductive to help us visualize the intention. Slow elution would be created by the molecules which were remained to attach to the stationary phase due to poor ability of a less polar solvent to compete. Molecules and a polar solvent successfully asserted for the stationary phase locations.

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The ground state is the lowest energy state of the atom.

We know that the electron configuration has to do with the manner in which electrons are arranged in an atom. The ground state is the lowest energy state of the atom. The atom could move to higher energy states by absorbing energy sometimes in the form of heat or light.

The ground state has to do with the lowest energy state of the atom and according to the Bohr theory, the atom could acquire energy and move from this lowest energy state to higher energy states. The higher energy states are short lived and the electron returns to the ground state.

We want to show the ground state of each of the atoms as shown in the question;

N - [tex]1s^{2} 2s^{2} 2p^{3}[/tex]

S - [tex]1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{10} 4p^{4}[/tex]

Rh - [tex]1s^{2} 2s^{2} 2p^{6}3s^{2} 3p^{6} 4s^{2} 3d^{10} 4p^{6} 5s^{1} 4d^{8}[/tex]

Thus, these are the ground state electron configurations of the nitrogen, sulfur, and rhenium atoms shown above respectively.

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