8th grade Questions I will slove subject science exercise
Answers
Answer:
1.Which of the following presents a safety hazard while working in the science laboratory?
A knowing how to use equipment
B wearing safety goggles
C following directions
D working alone
2. What is the proper safety response to a trash-can fire in a lab?
A throw chemicals on the fire
B leave the room to seek help
C watch the fire to see if it spreads
D use the appropriate fire extinguish
3.A very large redwood tree is measured to be about 100 units tall. Which unit is the most appropriate to
use?
A millimeters
B centimeters
C meters
D kilometers
4.The fine lead used in mechanical pencils has a diameter of about
A 0.5 centimetres
B 5.0 centimetres
C 0.5 millimetres
D 5.0 millimetres
5.Taylor stirs 2 grams of salt into a cup of water. He then tries to get the salt back by evaporating the
water. In this experiment, the mass of salt recovered would be the same as the initial mass because
A some of the salt evaporates with the water
B salt does not evaporate with water
C a chemical change occurred
D salt does not dissolve in water