Atoms, Molecules and Classifying Matter Quiz

Multiple Choice Identify the choice that best completes the statement or answers the question.

____ 1. Given the simple representations for atoms of two elements:

Which particle diagram represents molecules of only one compound? a.

c.

b.

d.

____ 2. You are given a solution of sugar and sand in water. Your task is to separate the sugar from the sand. Which of the following experimental designs would you choose? a. Filter out the sand and evaporate the water. b. Filter out the sugar. c. Let the solution stand for several minutes to let the sugar and sand settle out. d. Use a magnet to separate the sugar from the sand.

____ 3. Which of the following is the best construction of an explanation that describes the structure of an atom? a. protons and electrons grouped together in a random pattern b. protons and electrons grouped together in an alternating pattern c. a core of protons and neutrons surrounded by electrons d. a core of electrons and neutrons surrounded by protons

____ 4. A student developed a table to show the charges of the subatomic particles of an atom. The subatomic particle’s charges are represented by letters.

Which of the following is identified by the letter Z? a. -1, negative c. +1, positive b. 0, neutral d. -1, neutral

____ 5. The diagram below shows three containers of gas. Which list correctly describes the substances in containers R, S, and T?

a. R = element, S = compound, T = mixture b. R = compound, S = element, T = mixture c. R = element, S = mixture, T = compound d. R = mixture, S = element, T = compound

____ 6. Students were presented with the unlabeled model of an atom below.

If object 3’s charge was missing, how could a student correctly label it? a. Object 3 is located in the nucleus therefore, the student should label it neutron. b. Object 3 is the smallest particle therefore, the student should label it electron. c. Object 3 has a positive charge therefore, the student should label it proton. d. Object 3 is the located outside the nucleus therefore, the student should label it

proton.

____ 7. Scientist were studying the behavior of polar bears in the Arctic Circle.

Scientists discovered a deposit of an unknown substance near the water source of the polar bears. Scientists predict that the unknown substance is causing a change in the mating behavior of polar bears. A student wanted to know what type of mixture the unknown substance was. Which of the following is not an acceptable solution for the scientists to classify the unknown substance as a heterogeneous or homogeneous mixture? a. Observe multiple samples from multiple areas of the deposit. b. Boil the substance to see what doesn't evaporate. c. See how the substance reacts to vinegar. d. Pour the substance through a filter.

____ 8. Students were asked to develop a model of the different types of molecules. Which of the following models have the correct representations of each molecule? a.

b.

c.

d.

____ 9. All of the following would be helpful in separating a mixture of sand and salt EXCEPT a. a magnet. c. a filter paper and funnel. b. a glass cup. d. water.

Type of Molecule

Diatomic Molecule

Molecular Compound or

Compound Molecule

Elemental Molecule

Description

Two or more different atoms

that are bonded.

Two of the same atoms that are

bonded.

The same type of atoms bonded.

Pictures

Type of Molecule

Diatomic Molecule

Molecular Compound or

Compound Molecule

Elemental Molecule

Description

Two of the same atoms

that are bonded.

Two or more different atoms that are bonded.

The same type of atoms bonded.

Pictures

Type of Molecule

Diatomic Molecule

Molecular Compound or

Compound Molecule

Elemental Molecule

DescriptionThe same type

of atoms bonded.

Two or more different atoms that are bonded.

Two or more different

atoms that are bonded.

Pictures

Type of Molecule

Diatomic Molecule

Molecular Compound or

Compound Molecule

Elemental Molecule

Description

Two or more different atoms

that are bonded.

The same type of atoms bonded.

Two of the same atoms

that are bonded.

Pictures

____ 10. The table identifies characteristics of two substances, P and Q.

P Q Composed of the same type of atoms Composed of two types of atoms Has a fixed melting point Does not have a fixed melting point

Which of these can be concluded about substances P and Q? a. P and Q are both compounds. b. P is an element and Q is a mixture. c. P is a mixture and Q is a compound. d. P is a compound and Q is an element.

____ 11. Students were asked to create models of a molecule that could be formed due to a chemical reaction. A picture of the student’s model is shown below.

Which of the following does the model best represent? a. O2 c. CO2 b. H2O d. NO

____ 12. A container is filled with sand and an unknown substance. If a student pulled a magnet through the container and discovered iron filings what could the matter in the container be classified as due to know patterns of matter? a. a solution c. a mixture b. a pure substance d. a compound

____ 13. When a pair of pure substances are mixed there are two possible outcomes. Which of the following cause and effect arguments would provide the best evidence for the outcome to be a mixture?

a. The two substances will not interact, and the outcome is a mixture. In a mixture, each of the components of the mixture will retain its physical properties.

b. The two substances will interact, resulting in a new substance with new physical properties.

c. The two substances can still be separated even though they will interact creating a mixture.

d. The two substances can not be separated because they will interact creating a mixture.

____ 14. Students are studying molecules in science class. Below is an example of a molecule.

Which pattern would be the least helpful for a student distinguishing between the type of bond that created any molecule? a. whether the atoms of the molecules are sharing electrons or not b. the number of atoms in the molecule c. how close the elements of the molecule are on the periodic table d. the number of valence electrons of the atoms in the molecule

____ 15. Tommy knows that Kool-aid is made by mixing Kool-aid flavor mix, sugar, and water; therefore, he was able to determine that it is a?

a. Mixture c. Pure substance b. Molecule d. Solution

____ 16. Which diagram of an atom is correctly labeled? a.

c.

b.

d.

____ 17. A teacher boils clear liquids in two beakers. Afterward, Beaker A has a white powder left in it, but Beaker B is empty. The teacher states that one beaker contained only water while the other beaker contained salt water. Student 1 reaches the conclusion that Beaker A contained a mixture whereas Beaker B contained a pure substance. Student 2 reaches the conclusion that Beaker A only held water while Beaker B held salt water. Which student’s conclusion is most likely correct? a. Both students are correct. b. Both students are incorrect. c. Student 1 is correct, while Student 2 is incorrect. d. Student 1 is incorrect, while Student 2 is correct.

Electron

Proton

Neutron

++Neutron

Electron

Proton

++

Electron

Neutron

Proton

++Proton

Neutron

Electron

++

____ 18. Which of the following is the best construction of an explanation that describes the structure of an atom? a. A particle of matter that carries an overall positive charge. b. A particle of matter that is formed by the bonding of two or more molecules. c. The smallest particle of an element that shows all the properties of that element. d. The smallest particle of an element that can be broken down further to form

molecules.

____ 19. Students in a science class were asked to identify a molecule. Daniel described water (H2O) as a diatomic element. Which of the following statements about Daniel’s description of water is true? a. Daniel is correct because water (H2O) is made of two or more of the same atoms

that are chemically bonded. b. Daniel is correct because water (H2O) is made of two or more different types of

atoms that are chemically bonded. c. Daniel is incorrect because water (H2O) is made of two or more different types of

atoms. d. Daniel is incorrect because water (H2O) is made of two molecules that are

chemically bonded.

____ 20. Tommy had part of a gallon milk in his refrigerator. He wondered if that milk was a mixture or pure substance. Which question is best to answer his question?

a. What is the chemical formula of milk?

b. What is the boiling point of milk?

c. What does milk look like after filtering?

d. What will happen when I put the milk to a flame?

____ 21. Which of the following effects the atomic radius and electronegativity of an atom by being farther from the center of an atom? a. nucleus c. neutron b. proton d. electron

____ 22. Iron can be found as a gray powder and sulfer can be found as a yellow powder. A student is shown models of two substances made of iron (Fe) and sulfer (S).

The student is asked to classify each substance as a mixture of a pure substance and describe how it would appear. Which classification and description of the models is correct? a.

b.

c.

d.

____ 23. Which molecule is also a diatomic element due to its components? a. bromine gas (Br2) c. hydrogen fluoride (HF) b. carbon dioxide (CO2) d. sodium Chloride (NaCl)

____ 24. Which of the following best describes a mixture? a. a material that is made up of many molecules b. a material that contains two or more different substances c. a substance that can be changed into another substance d. a substance that has been broken down into its smallest parts

____ 25. Students were presented with a model of a carbon dioxide (CO2) below.

Which statement correctly describes carbon dioxide (CO2)?

a. Carbon dioxide (CO2) is a diatomic element because it is composed of two elements.

b. Carbon dioxide (CO2) is a molecular compound because it is made of two or more elements combined.

c. Carbon dioxide (CO2) is a monatomic element because it is made of 1 type of atom.

d. Carbon dioxide (CO2) is a elemental compound because it is made of elements.

____ 26.

Based on its location on the partial periodic table shown above, which element would you predict has an electronegativity lower than Nitrogen (N) due to patterns in the periodic table? a. Boron (B) c. Chlorine (Cl) b. Fluorine (F) d. Helium (He)

____ 27. A student created the model of a sodium (Na) atom below.

The student added an arrow to represent the subatomic particle that is released or gained in order to bond with another atom. Which subatomic particle did the student identify with it’s appropriate charge? a. electron, positive c. proton, negative b. proton, positive d. electron, negative

____ 28. Potting soil usually contains soil, organic matter, and perlite (small white balls that help keep the soil loose). Which of the following terms could be used to classify potting soil? a. mixture c. element b. formula d. compound

____ 29. The model of a substance is shown below.

What type of molecule is represented? a. Monatomic because the molecule has one type of atom not bonded b. Elemental because it is made of a group of only one type of atom. c. Monatomic because it is made of two or more types of atoms not bonded. d. Elemental because it does not have chemical bonds.

____ 30. Which of the following is found farthest from the center of an atom? a. nucleus c. neutron b. proton d. electron