Chemistry Test 1 2025 (COPY) - Unit 1

Using their observations, which types of matter are mixtures?

• the water and copper wire

• the oil and vinegar; the water

• the water; the marbles and paper clips

• the oil and vinegar; the marbles and paper clips

Liam knows that some of the bubbles in his experiment must be oxygen. He draws an atomic model of the element oxygen. What does he include in his drawing? Select all that apply.

• sixteen protons in the nucleus

• eight electrons outside of the nucleus

• eight neutrons in the nucleus

• sixteen neutrons in the nucleus

• eight protons in the nucleus

Tags

NGSS.MS-PS1-1

A student is examining the liquid mercury inside a thermometer. If the liquid is composed of only mercury atoms, what can the student conclude?

• The liquid is a pure substance because it is made up of elements.

• The liquid is a pure substance because it is made up of mixtures.

• The liquid is an impure substance because it is in a liquid state.

• The liquid is an impure substance because it is inside a thermometer.

The diagram shows a chemistry demonstration. Which statement best describes this demonstration?

• Step one contains a compound, which is chemically combined in step two, forming a mixture in step three.

• Step one contains a compound, which is physically combined in step two, forming a mixture in step three.

• Step one contains a mixture of elements, which are physically combined in step two, forming a new compound in step three.

• Step one contains a mixture of elements, which are chemically combined in step two, forming a new compound in step three.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS1-5

Daniella wrote a table comparing pure substances and mixtures. Pure Substances: - elements and compounds - cannot be separated using physical means Mixtures: - contains two or more substances - are chemically combined Daniella made a mistake on her table. Which best describes the mistake she made?

• A. Elements and compounds are considered mixtures.

• B. Mixtures contain at least three or more substances.

• C. Pure substances can be separated using physical means.

• D. Mixtures are substances that are not chemically combined.

Salt and sugar are poured into a glass of water and stirred. Slowly, the salt and sugar crystals become harder to see and then cannot be seen at all. What happened to the salt and sugar?

• They dissolved into the water, forming a mixture.

• They evaporated from the water, forming a solid.

• They reacted with the water, forming a compound.

• They combined with the water, forming an element.

Tags

NGSS.MS-PS1-2

Sam's mother is cooking breakfast in a cast-iron frying pan. If the pan is made only of iron, what can Sam conclude?

• The pan is a pure substance with the chemical symbol Fe.

• The pan is a pure substance with the chemical symbol F.

• The pan is a pure substance with the chemical symbol Ir.

• The pan is a pure substance with the chemical symbol I.

Which statement BEST describes a major difference between different types of elements?

• Only some elements have atoms with subatomic particles.

• Only some elements are composed of atoms with electrons.

• The atoms of different elements have different locations for their nucleus.

• The atoms of different elements have different numbers of protons and electrons.

Bernice draws an oxygen atom. She draws a small circle for the nucleus. Inside of the circle, she draws plus signs for protons and dots for neutrons. Around the nucleus she uses minus signs to represent electrons. Which statements are true about her drawing? Select all that apply.

• There are eight protons in the nucleus.

• There are eight neutrons in the nucleus.

• There are sixteen electrons in her drawing.

• There are sixteen protons in the nucleus.

• There are sixteen neutrons in the nucleus.

Tags

NGSS.MS-PS1-1

Haven draws a model of a carbon (C) atom using the periodic table. What are the subatomic particles she draws in the nucleus, and how many of each?

• six protons and six neutrons

• six protons and six electrons

• twelve neutrons and six protons

• twelve neutrons and twelve electrons

Tags

NGSS.MS-PS1-1