Science Quiz

During a lab experiment, a beaker of hydrochloric acid was accidentally knocked over. Following correct laboratory safety procedures, everyone moved back and the teacher was notified of the spill. What is the safest next step to follow in the clean-up of this spill?

• Paper towels should be used to wipe up the acid.

• Water should be used to dilute the acid.

• Lick the spilled acid with your tongue.

• Let the acid sit on the counter until it evaporates.

Tags

NGSS.HS-ETS1-3

What is the basic unit of length in the metric system of measurement?

• yard

• inch

• meter

• centimeter

What is the basic unit of mass in the metric system of measurement?

• Liter

• ton

• gram

• pound

A student determines the density of an irregularly shaped block of lead in the laboratory. The displacement volume measured 25.2 mL using a graduated cylinder. The mass on the electric balance reads 285.768 g. What is the density of lead reporting to the appropriate number of significant figures allotted by the equipment used?

• 11 g/mL

• 11.3 g/mL

• 11.34 g/mL

• 11.340 g/mL

A student needs to use 5 x 10^-2 M HCl in an experiment (M represents molarity, a unit of concentration for solutions). All the labels state molarity in standard notation rather than scientific notation. In order for the student to use the correct molarity, what should the label on the bottle of HCl read?

• 500 M HCl

• 50 M HCl

• 0.5 M HCl

• 0.05 M HCl

Which type of change must occur to form a compound?

• Phase

• Chemical

• Physical

• Nuclear

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which substance cannot be decomposed by a chemical change?

• HF

• N₂O

• Ne

• H₂O

Which term best describes a sample of Fe₂O₃?

• a covalent compound

• an ionic compound

• an element

• a mixture

Tags

NGSS.MS-PS1-1

Which particle diagram best represents this same substance after a physical change has taken place?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-4

Which statement describes the type of change and the chemical properties of the product and reactants?

• The equation represents a chemical change, with the product and reactants having identical chemical properties.

• The equation represents a physical change, with the product and reactants having identical chemical properties.

• The equation represents a chemical change, with the product and reactants having different chemical properties.

• The equation represents a physical change, with the product and reactants having different chemical properties.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2