Exam #1

Both hot and cold glass have the same visual appearance.

• TRUE

• FALSE

The basic unit of all matter.

• Atom

• Molecule

• Cell

• Compound

Tags

NGSS.MS-PS1-1

A uniform mixture is referred to as this.

• Homogeneous mixture

• Heterogeneous mixture

• Colloid

• Suspension

Name the change of state that describes a gas becoming a liquid.

• Condensation

• Evaporation

• Sublimation

• Freezing

Hydrogen peroxide decomposes when exposed to sunlight to form water and oxygen.

• This is a physical property/change.

• This is a chemical property/change.

• This is an endothermic change.

• This is an exothermic change.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Magnesium metal melts at 650°C.

• This is a physical property/change.

• This is a chemical property/change.

• This is an endothermic change.

• This is an exothermic change.

A block of cobalt measures 1.50 cm x 3.0 cm x 2.0 cm. The mass is 81.18 grams. What is the density?

• 8.98 g/cm³

• 9.02 g/cm³

• 9.12 g/cm³

• 9.18 g/cm³

Significant Figures and Scientific Notation Fill in the following table – use the correct number of significant figures. Measurement: 172,050 No. of Sig Figs: ____

• 5

• 4

• 3

• 6

• not enough information to answer

Significant Figures and Scientific Notation Fill in the following table – use the correct number of significant figures. Measurement: 0.00001

Scientific Notation: ____

• 1 x 10^-5

• 1.00 x 10^-5

• 1.0 x 10^-5

• 0.00001

• 0.0001

​ (a)   is how close your measurement is to the accepted answer, while ​ (b)   is how close your measurements are to each other.

• accuracy
• precision
• correctness

Tags

chapter two