Unit 1 science review 6th grade

Which of the following is the symbol for chlorine?

• C

• Cl

• Ch

• Ce

The chemical symbol for nitrogen is —

• Na

• Ni

• Ne

• N

Which of the following statements are characteristics of an element?

I. Elements are made from a mixture.
II. An element is a pure substance.
III. Elements are represented by a symbol.
IV. Elements make up matter on Earth.

• I, III

• I, IV

• II, IV

• II, III, IV

Which of the following statements are characteristics of a compound?

I. Compounds are made from two or more elements.
II. A compound is a pure substance.
III. Compounds are represented by a chemical symbol.
IV. Compounds are represented by a chemical formula.

• I, III

• I, IV

• I, II, IV

• II, III, IV

Which model shown above best represents the element neon as a gas?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-4

Which of the following substances represents an element?

1. CO
2. Ag
3. HI
4. CN-
5. Db
6. Xe

• 2, 3, 5, and 6

• 2, 5, and 6

• 1 and 4

• 1, 3, and 4

Tags

NGSS.MS-PS1-1

Which of the following substances represents a compound?

1. Cr
2. KF
3. H2SO4
4. Cs
5. Al2O3
6. CaO

• 2, 3, 5, and 6

• 2 and 6

• 1 and 4

• 1, 2, and 4

Tags

NGSS.MS-PS1-1

Which of the following do NOT describe an element?

1. A mixture of different chemicals
2. Represented by a symbol that contains one uppercase letter
3. Represented by a symbol that can contain a second uppercase letter
4. Represented by a symbol that can contain a lower case letter
5. A pure substance
6. Can be identified using the periodic table

• 1 and 3

• 1, 3, and 4

• C

  2, 3, 5, and 6

• 1 and 4

Which of the following students best describes an element?

• 1

• 2

• 3

• 4

Compounds are pure substances. What other substances are considered pure substances?

• Chemical reactions

• Elements

• Mixtures

• Solutions