Question 1

Which of the following chemical elements corresponds to the symbol O?

Accepted Answer

The symbol O corresponds to the element oxygen.

Question 2

Which of the following can be separated into two or more pure substances using a physical method?

Accepted Answer

A mixture is made up of two or more pure substances, which can usually be separated using physical methods such as filtration or distillation. Compounds and elements cannot be separated by physical methods.

Question 3

Sterling silver is an alloy of silver and 7.5% copper.Which of the following describes sterling silver?

Accepted Answer

Sterling silver is a homogeneous mixture because it is a uniform and evenly distributed combination of silver and copper. It is not a compound because the silver and copper retain their individual properties and can be separated by melting or dissolving the alloy. It is also not an element because it is a combination of two different elements, silver and copper.

Question 4

What is the term for a change of state from a liquid to a solid?

Accepted Answer

Freezing is the process in which a liquid changes to a solid state due to the removal of heat.

Question 5

A deep-sea scuba tank contains helium,oxygen,and traces of other gases.Which of the following describes the gas in the scuba tank?

Accepted Answer

The gas in the scuba tank is a homogeneous mixture because it contains multiple gases that are evenly distributed throughout the tank. It is not a compound because compounds are made up of two or more elements chemically combined in a fixed ratio, and it is not an element because it contains multiple different types of atoms. It is also not a heterogeneous mixture because the gases are evenly distributed throughout the tank.

Question 6

What is the term for a direct change of state from a gas to a solid?

Accepted Answer

Deposition is the term used for the direct change of state from gas to solid, where the gas molecules lose energy and come together to form a solid without passing through the liquid state. Condensation is the change of state from gas to liquid, vaporization is the change of state from liquid to gas, and sublimation is the change of state from solid to gas without passing through the liquid state.

Question 7

Water in a swimming pool contains dissolved sodium chloride and many other salts.Which of the following describes water in a swimming pool?

Accepted Answer

Water in a swimming pool is a homogeneous mixture because the dissolved sodium chloride and other salts are uniformly spread throughout the water, creating a single phase solution.

Question 8

Brass is an alloy of copper and zinc and the percentage of copper can vary from 60-80%.Which of the following describes brass?

Accepted Answer

Brass is a homogeneous mixture because it is a blend of two or more metals, copper and zinc, that are evenly distributed throughout the mixture.

Question 9

Which of the following chemical elements corresponds to the symbol H?

Accepted Answer

The chemical symbol H corresponds to hydrogen. Hafnium's symbol is Hf, helium's symbol is He, and tritium's symbol is T or 3H.

Question 10

Which of the following can be separated into two or more pure substances using a chemical method?

Accepted Answer

A compound can be separated into its constituent elements or simpler compounds through chemical reactions, such as decomposition. Elements cannot be broken down further by chemical means, and mixtures can be separated by physical methods, not chemical.

Question 11

Which of the following chemical elements corresponds to the symbol F?

Accepted Answer

The chemical symbol F corresponds to the element fluorine on the periodic table. Fermium is represented by the symbol Fm, francium by Fr, and phosphorus by P. Therefore, the correct answer is B) fluorine.

Question 12

Which of the following chemical elements corresponds to the symbol B?

Accepted Answer

The chemical symbol B corresponds to boron. Barium is represented by the symbol Ba, beryllium by Be, and bismuth by Bi. Therefore, only option D (boron) is the correct answer.

Question 13

Bronze is an alloy of copper and tin and the percentage of copper can vary from 70-90%.Which of the following describes bronze?

Accepted Answer

Bronze is a homogeneous mixture because it is a combination of two or more substances (copper and tin) that are evenly distributed at a molecular level. It is not a compound because it is not formed by chemical bonds between the copper and tin atoms, and it is not an element because it is not made up of only one type of atom. It can also be classified as an alloy, which is a type of homogeneous mixture made up of two or more metals.

Question 14

Air contains nitrogen,oxygen,argon,and other gases.Which of the following describes air?

Accepted Answer

Air is a homogeneous mixture, meaning that it has uniform composition throughout and its components are evenly distributed.

Question 15

Which of the following chemical elements corresponds to the symbol N?

Accepted Answer

N is the chemical symbol for nitrogen, which is not listed among the options provided.

Question 16

Which of the following chemical elements corresponds to the symbol S?

Accepted Answer

The symbol S corresponds to the element sulfur, which is not listed among the options provided.

Question 17

Which of the following chemical elements corresponds to the symbol P?

Accepted Answer

The chemical symbol P corresponds to phosphorus. Platinum is represented by Pt, plutonium by Pu, and potassium by K.

Question 18

Which of the following chemical elements corresponds to the symbol C?

Accepted Answer

The symbol "C" corresponds to Carbon, which is not listed among the options provided. Cadmium is Cd, Chromium is Cr, Cobalt is Co, and Copper is Cu.

Question 19

Which of the following chemical elements corresponds to the symbol A?

Accepted Answer

The symbol "A" does not correspond to any chemical element. Aluminum is represented by "Al", antimony by "Sb", argon by "Ar", and arsenic by "As".

Question 20

Which of the following chemical elements corresponds to the symbol I?

Accepted Answer

The symbol I corresponds to iodine on the periodic table.

Quiz 3: Matter and Energy