In a chemical reaction, 100 grams of calcium chloride was added to 300 grams of baking soda for a total mass of 400 grams. Assuming that the law of conservation of mass was demonstrated during this reaction, what would be the mass of the product?

400 grams because the mass of the product is equal to the sum of the reactants.

200 grams, because the mass of the product is less than the mass of the reactants.

500 grams because the mass of the product is more than the mass of the reactants.

It cannot be determined from the given information.

The diagram above shows a candle before, during, and after burning. The mass before and after the reaction is also shown. What can you conclude about the chemical reaction?

When the candle was burned, 7 grams of smoke and ash was released into the air.

When candle wax melts and becomes solid again, it is less dense than the original candle wax.

Because the reaction only involves a change in state, the mass of the products is less.

The mass of the candle is lower after burning because matter was destroyed during the reaction.

The pH of the following bases is: blood=8, milk of magnesia=9 and ammonia=12—which of the following is the best description?

Milk of magnesia is the strongest base.

James created a saltwater solution by adding a scoop of the solute, salt, to a beaker of the solvent, water. After all the salt dissolves, James places the beaker of salt water on a hot plate and begins to heat the solution. After half of the water evaporates, the concentration of the solution has

It is impossible to tell without measuring.

A chemistry student mixes 5 grams of sodium chloride (NaCl) in 100 ml of water and stirs until all of the salt is dissolved. Once dissolved, the student measures the electrical conductivity of the solution. An additional 5 grams of NaCl is then dissolved in the solution. Which statement MOST accurately describes how the additional five grams of salt will affect the electrical conductivity of the solution?

The conductivity of the solution will increase because more ions are being added to the solution.

The conductivity of the solution will decrease because salt is an insulator and more is being added.

The conductivity of the solution will decrease because the concentration has changed—the solution is more dense.

The conductivity of the solution will increase because additional electrical potential is being added to the solution.

Jose makes two mixtures. Mixture one contains 10 g of salt dissolved in 50 mL of water. Mixture two contains 20 g of salt dissolved in 50 mL of water. Compare the concentrations of the two mixtures.

Mixture two is more concentrated than mixture one.

Both mixtures are equally concentrated.

The mixtures are of equal concentration.

Mixture one is more concentrated than mixture two.

Which conclusion about Solution Z is BEST supported by the data?

Solution Z is more basic than Solution Y.

Solution Z is more acidic than Solution X.

Why is sulfuric acid (H2SO4) considered an acid?

It produces hydrogen (H+) ions in solution

It contains a hydroxide (OH-) ion

During science, Jim's teacher gives this simple rule to use as a first attempt to increase solubility of the solute and the rate of solution.

Agitate the solute in the solvent

Decrease the temperature of the water

Increase the concentration of salt

Increase particle size of the solute.

Assume that Charlee has two separate beakers containing the same amount of clear liquid in each with the same temperature. At this point, all equipment (beakers and stir rods) are identical. She adds one spoonful of the same solute to each beaker and stirs them at the same speed. In one beaker, the rate of dissolving of the solute is significantly faster than the other. Elaborate on a possible reason why.

The beaker that dissolved the solute slower already has some solute in it.

The instrument used to stir was much bigger than the instrument used to stir the other.

The solutes placed in the beaker were put in at different rates.

The water was much warmer in the beaker that dissolved it faster.

The compound LiOH is classified as a base. Based on this, what is known about this substance?

LiOH will have a pH higher than 7 and turn litmus paper blue

LiOH will have a pH higher than 7 and turn litmus paper red

LiOH will have a pH lower than 7 and turn litmus paper red

LiOH will have a pH lower than and turn litmus paper blue

Chemical Energy Part 2 Unit Test (HS)

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MULTIPLE CHOICE QUESTION

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Which choice represents the total number of Oxygen atoms in the chemical equation 4H + O₂ ➔ 2H₂O?

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Using the solubility curve given, what mass of solute will dissolve in 100mL of water at the following temperature? KNO3 at 70°C

Using the solubity curve given, which of the following substances is most soluble in water at 15°C.

Using the solubity curve given, a solution that contains 70g of NaNO3 at 30°C (in 100 mL H2O) would be classified as _____

Using the solubility curve given, a solution that contains 50g of NH4Cl at 50°C (in 100 mL H2O) would be classified as_____

Using the solubility curve given, a solution that contains 30g of KClO3 at 50°C (in 100 mL H2O) would be classified as______________.

What type of reaction does the following equation represent? Na + KCl → K + NaCl

Which choice represents the total number of Oxygen atoms in the chemical equation 4H + O2 ➔ 2H2O?

In a chemical reaction, 100 grams of calcium chloride was added to 300 grams of baking soda for a total mass of 400 grams. Assuming that the law of conservation of mass was demonstrated during this reaction, what would be the mass of the product?

The diagram above shows a candle before, during, and after burning. The mass before and after the reaction is also shown. What can you conclude about the chemical reaction?

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Which choice represents the total number of Oxygen atoms in the chemical equation 4H + O₂ ➔ 2H₂O?