Lab Safety and Lab ToolsWarm Up

Which tools would be necessary to make the measurements needed in an investigation of the effect of temperature on the time it takes to dissolve salt in water?

A. Thermometer and hot plateB. Hot plate and stop watchC. Goggles and thermometerD. Stop watch and thermometer

The only tools a group of students have are a clock and a triple-beam balance. With these measuring tools, students could answer which of the following questions?

A. How many years does it take for a rock of a certain mass to become smooth in a river? B. How does the length of time a lima bean soaks in water affect the amount of water it can absorb? C. Can students who are taller run faster than students of the same age who are shorter? D. Does the mass of a planet affect how long it take to make one orbit around the sun?

Students are conducting an investigation in which they need to measure the mass of a beaker of a certain liquid. They place a glass beaker of the solution on a triple-beam balance. The students know the mass of the beaker is 125 grams. What is the mass of the liquid?

A. 35 grams

B. 125 grams

C. 210 grams

D. 335 grams

Batteries made before 1997 contain high levels of the toxic substance mercury. These batteries can’t be recycled and should not be thrown in the regular trash, while newer batteries are safe for both. An old battery would be safe for regular disposal or recycling if it were made in which of the following years?

A.1982B.1985C.1994D.1999

Students are working to find the mass of a hand lens. Which of the following would the students use to measure mass?

A.C.

B.

D.