Chemistry Unit Exam: REVIEW

What is a compound?

• A single element

• A physical blend of substances

• A mixture of elements

• A substance composed of atoms of 2 or more elements chemically combined

Tags

NGSS.MS-PS1-1

What is the chemical formula for water?

• CH3COOH

• NaCl

• H2O

• CH4

Tags

NGSS.MS-PS1-1

What is the chemical formula for salt?

• CH4

• H2O

• NaCl

• CH3COOH

What type of bond is formed when atoms share electrons?

• Covalent bond

• Hydrogen bond

• Ionic bond

• Metallic bond

What is an ionic bond?

• A bond formed by the attraction of two similar atoms

• A bond formed by the attraction of two oppositely charged atoms

• A bond formed by the sharing of protons

• A bond formed by sharing electrons

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-3

Which of the following is an example of an ionic compound?

• Sodium chloride (NaCl)

• Oxygen (O2)

• Methane (CH4)

• Water (H2O)

What property of water makes it a universal solvent?

• Viscosity

• Polarity

• Temperature

• Density

Tags

NGSS.HS-ESS2-5

Which of the following is NOT a particle found in an atom?

• Molecule

• Neutron

• Proton

• Electron

What is the charge of a neutron?

• Negative

• Neutral

• Positive

• Variable

What happens to the charges of protons and electrons in a standard atom?

• They amplify each other

• They attract each other

• They repel each other

• They cancel each other out