OCPS Chemistry

Which of the following is a pure, elemental substance?

• air

• CO₂(g)

• H₂(l)

• NaCl(s)

Which of the following is an example of a homogeneous mixture?

• sugar, C₁₂H₂₂O₁₁

• air

• fresh squeezed orange juice (with pulp)

• copper

Which of the following is an example of a heterogeneous mixture?

• steel

• chicken noodle soup

• filtered apple juice

• copper

which of the above drawings represents a mixture

• drawing (a)

• drawing (b)

• drawing (c)

• drawing (a) and (c)

Which of the following represents a physical change only?

• burning a propane camping stove

• cooking a steak

• adding electricity to water to produce hydrogen and oxygen gas

• condensing of steam

The term used to describe the conversion from a liquid state to a gaseous state is ______.

• condensation

• sublimation

• vaporization

• melting

Tags

NGSS.MS-PS1-4

Which of the following represents a chemical change?

• steel turning to rust in salt air

• ice melting to form liquid water

• water boiling to form steam

• sugar dissolving into hot coffee

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The number 0.0040000 has _____ significant figures.

• 4

• 0

• 6

• 2

• 5

The diameter of an atom is approximately 1.1 x 10^-10m. What is the diameter in millimeters?

• 1.1 x 10^-4mm

• 1.1 x 10^-16mm

• 1.1 x 10^-7mm

• 1.1 x 10^-13mm

How many significant figures are there in the answer to the following problem? (8.881 x 2.100) - 9.590 = ?

• one

• two

• three

• four