2. A scientist mixed two samples together: a colorless liquid that melts at 12°C and a yellow solid that melts at 390°C. She analyzed the results and found two ending substances. One of the ending substances was a gray solid. This ending substance is made up of the repeating group of atoms shown above. Which of the diagrams to the left shows the repeating groups of atoms that make up the samples the scientist mixed together?

Answer: Number of oxygen atoms

because carbon dioxide is named CO2 which means 1 carbon 2 oxygen and monoxide is CO or 1 carbon one oxygen

Explanation:

2 Na ( s ) + 2 H2O ( l ) = 2 NaOH ( aq ) + H2 ( g )

Here's the balanced equation

Answer:

CuO + Zn → ZnO + Cu

Explanation:

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First, let's recall the equation for half-life:

N(t) = [tex]N_{0}[/tex] · [tex]\frac{1}{2}^{\frac{t}{t_{1/2}}}[/tex]

Woah.

While we could certainly solve this question by using the half-life equation, it might be easier to just give this question some thought.

Half-life, is, essentially, the time it takes for radioactive material to be halved.   For example, if something had a half-life of ten years and weighed 20 pounds, after ten years it would weigh 10 pounds and after another ten years would weigh 5 pounds, then 2.5, and so on. (Note that it never actually reaches 0! It keeps halving and halving over and over again, becoming smaller and smaller but never disappearing!)

In this question, we're given the half-life of Carbon-14 and asked how old a tree with 1/4 the amount of carbon-14 of a normal tree would be. Let's think about this question:

We figured out that it takes two half-lives for Carbon-14 to be 1/4 its original amount! Since the duration of a half-life never changes, we can simply multiply 5730 by 2 to find how many years it'd take to achieve two half-lives:

5730 · 2 = 11460

The tree is about 11,460 years old.

And we've solved it! (A quick tip - if you ever encounter a question like this again, you can quickly calculate the number of half-lives in your head depending on the amount remaining that they give you. Just keep halving the amount every half-life! One half-life is 1/2, two half-lives is 1/4, three is 1/8, four is 1/16, and so on and so forth)

If you have any questions about anything I explained here or need clarification on anything, just let me know! Good luck!

- breezyツ

Answer:

1.the highest point of the wave is the crest while lowest point is trough.

2.?

3. wave length

4. frequency

5. A is crest b is trough c is amplitude and d is wave length

7.a = this is longitudinal wave, b no = letter h represents a compression and letter I represents rarefactions , letter g represents a wave length.

8 . in transverse wave

9. longitudinal wave

10. longitudinal wave

11. transverse wave

12. ?

Explanation:

Ionic compounds conduct electricity when molten (liquid) or in aqueous solution (dissolved in water), because their ions are free to move from place to place. Ionic compounds cannot conduct electricity when solid, as their ions are held in fixed positions and cannot move.

Answer:

water and liquid HF are polar solvents, hence they disslove polar solutes like ionic salts

Waxes and Oil however are non polar solvents, hence they dissolve non polar solutes.

As a general law; Polar solvent dissolves polar solute. Non polar solvent dissolves non polar solutes

Answer:

0.2moles

Explanation:

 1 grams Cu(NO3)2 to mol = 0.159952398166305

10 grams Cu(NO3)2 to mol = 0.159952398166305

if we round that up the only valid answers are either 0.1 or 0.2

Explanation:

Take the first 6 going down and that's how your gonna do it

Answer:

kitchen

Explanation:

Chloroplast help to trap light energy from the sun which in turn is used to generate energy for the cell, likewise kitchen holds the materials that are required for cooking food which when taken gives the body energy as well.

Answer:

Anaerobic exercise uses energy that’s readily available in your muscles, because the body isn’t relying on oxygen, these strong, powerful movements can only be sustained for 10 to 15 seconds.

Explanation:

Anaerobic exercise is beneficial for good health because it:

Strengthens bones

Burns fat

Builds muscle

Maintains muscle mass, which is important for people as they age

As we age, we tend to lose muscle at a rate of about 1 percent per year after age 27, unless we actively work to slow that decline, Muscle is a metabolically active tissue and the more of it we can maintain, the more calories we can burn while at rest.
Anaerobic respiration occurs more quickly than aerobic respiration.
A major advantage of aerobic respiration is the amount of energy it releases. Without oxygen, organisms can split glucose into just two molecules of pyruvate. This releases only enough energy to make two ATP molecules.
Methanogenesis, a form of carbon-dioxide respiration, that is used to produce methane gas by anaerobic digestion. Biogenic methane is used as a sustainable alternative to fossil fuels.
Anaerobic respiration is a critical component of the global nitrogen, iron, sulfur, and carbon cycles through the reduction of the oxyanions of nitrogen, sulfur, and carbon to more-reduced compounds.
Specific types of anaerobic respiration are also critical in bioremediation, which uses microorganisms to convert toxic chemicals into less-harmful molecules to clean up contaminated beaches, aquifers, lakes, and oceans. For example, toxic arsenate or selenate can be reduced to less toxic compounds by various anaerobic bacteria via anaerobic respiration.
Hope you will find it helpful. I tried my best. Thank you.

The element which X represents in the given graphic is Carbon

From the question, we are to determine the element in which X represents

Comparing the given graphic with the atomic notation shown in the attachment, X has a mass number of 12 and an atomic number of 6

The element which has a mass number of 12 and an atomic number of 6 is Carbon.

Hence, the element which X represents in the given graphic is Carbon.

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The value of the Gibbs free energy (ΔG) for the reaction given in the question is –18 KJ/mol

The Gibbs free energy (ΔG) can be obtained by using the following equation as illustrated below:

ΔG = ΔH – TΔS

ΔG = 27 – (500 × 0.09)

ΔG = 27 – 45

ΔG = –18 KJ/mol

Thus, the value of ΔG for the reaction is –18 KJ/mol

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Answer:

Sugar dissolves faster in hot water than it does in cold water because hot water has more energy than cold water. When water is heated, the molecules gain energy and, thus, move faster. As they move faster, they come into contact with the sugar more often, causing it to dissolve faster.

Explanation:

Answer:

C. Solubility is how much solute will dissolve in solvent.

Explanation:

Solvent dissolves solutes, not the other way around, and solids aren't the only things that have solubility, I don't see how precipitation has anything to do with this, so answer C. is the correct answer. Also, I took the test and got the answer right.

The statement that is true about solubility is "Solubility is how much solute will dissolve in solvent".

Solubility is the amount of solute that can be dissolved in a solvent. Generally, the solubility of most solutes increases with an increase in the temperature of the solvent.

The property that can help sugar molecules or salt crystals to dissolve is known as solubility.

Factors that affect solubility include:

Concentration of the solute

Temperature

Pressure

Polarity of the solute and the solvent

Given options are-

Solubility is how much solid only will dissolve in liquid only.

Solubility is how much solvent will dissolve in solute.

Solubility is how much solute will precipitate out of solvent.

Solubility is how much solute will dissolve in solvent.

Therefore, The statement that is true about solubility is "Solubility is how much solute will dissolve in solvent".

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Answer:

The decrease of decomposers. The decrease of decomposers led to a change in carbon dioxide in biodome files.

Answer:

Explanation:

They are all gases at room temperature.

Hope this helps!

The new volume of the gas is 16.3 L.

Boyle's law states that the volume of a fixed mass of gas is inversely proportional to its pressure, at a constant temperature.

To calculate the new volume of the gas, we use the expression from Boyle's law.

Formula:

Where:

Make V' the subject of the equation

From the question,

Substitute these values into equation 2

Hence, The new volume of the gas is 16.3 L.

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Answer:

Answer 1) In the mixture of sand, NaCl and CaCO_{3}CaCO

3

first separation was done by dissolving the mixture in water. In the first step the NaCl will get dissolved whereas, CaCO_{3}CaCO

3

will be undissolved and sand will settle at the bottom. Here, the physical property of solubility of NaCl in water is taken into consideration. The collected water is then filtered off and evaporated to get the NaCl back from the mixture with some loss. No chemical change occurs in case of NaCl extraction from water.

Answer 2) When CaCO_{3}CaCO

3

was to be removed from the undissolved part. The chemical property of CaCO_{3}CaCO

3

was used. Where it gets dissolved in acidic medium. And this way we can extract CaCO_{3}CaCO

3

and remove sand from it. We change the chemical composition of CaCO_{3}CaCO

3

by adding HCl to the mixture and dissolve CaCO_{3}CaCO

3

to form CaCl_{2}CaCl

2

which gets dissolved into the solution of HCl. Here, first decantation occurs and then extraction is done. Second, extraction is done using potassium carbonate in it which separates CaCl_{2}CaCl

2

from sand.

Answer 3) Here, Unknown mixture of salt and sand weighed =7.52 g (before washing);

Unknown mixture of salt and sand weighed =3.45 g (after washing);

To calculate the amount of salt in it, we can simply subtract the values of before and after washing change in weights.

The property of NaCl being soluble in water it will go away with washing leaving behind the sand only, after washing.

So, Weight of salt was = 7.52g - 3.45 g = 4.07g

To find the percentage of sand that was mixed with salt =

(3.45 g sand / 7.52g of mixture) X 100 = 45.9% sand was mixed with salt.

To verify whether the correct percentage of salt and sand was calculated we can recheck the value for salt as well.

(4.07 g of salt / 7.52g of mixture) X 100 = 54.1% salt

On adding we get, 45.9% + 54.1% = 100%.

Which confirms that the calculations are correct.

Explanation:

Answer: Point nine six grams per mole which are often just written G / mo L and that's the molar mass or molecular weight for al2o3 aluminum oxide.

Explanation:

M1V1 = M2V2

M1 = 3.000 M

V1 = 0.8000 L

M2 = ?

V2 = 2.00 L

M2 = M1V1/V2 = (3.000 M)(0.8000 L)/(2.00 L) = 1.20 M

A chemist pours 500 mL of a 3.0000 molar solution of sodium hydroxide into a 3.0000 liter volumetric flask and fills the flask up with water. 1.20 M is the molarity of the new solution.

Molarity is also known as concentration in terms of quantity, molarity, or substance. It is a way to gauge how much of a certain chemical species—in this case, a solute—is present in a solution. It refers to a substance in unit volume for solution in terms of quantity.

The amount of moles / litre is the molarity unit that is most frequently used in chemistry. One mol/L of a solution's concentration is referred to as its molarity. It is frequently abbreviated as 1 M. When one gramme of solute dissolves in one litre of solution, the solution has a molarity of one.

M1V1 = M2V2

M1 = 3.000 M

V1 = 0.8000 L

M2 = ?

V2 = 2.00 L

M2 = M1V1/V2 = (3.000 M)(0.8000 L)/(2.00 L) = 1.20 M

Therefore, 1.20 M is the molarity of the new solution.

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Answer

I know the answer

Explanation:

Answer:

The study of electricity in chemistry.

Answer:

See below, please

Explanation:

1 mol CH4 ——＞2 mol H2O=2x18 g/mol= 36 g

The question is not clear. You should tell us the concentration of CH4, methane.

Reaction

CH₄ (g) + 2O₂ (g) <=> CO₂ (g) + 2H₂O(g)

assume at STP ( 1 mole gas = 22.4 L)

for 20 L, moles of methane:

= 20 : 22.4 = 0.893

moles of water = 2/1 x mol methane = 2/1 x 0.893 = 1.786

mass of water = mol x molar mass = 1.786 x 18 g/mol = 32.148 g

Answer:

I hope this helps you

:)

Answer:

The process in which we breathe out carbon dioxide and breathe in oxygen.

Explanation: