Review Force and Lab Safety

Front

What type of investigation did the students conduct when given samples of simulated Martian soil to observe, describe, and investigate for any evidence that may indicate that life existed at one time? Options: Descriptive, Comparative, Experimental, Conclusive

Back

Descriptive

Front

All of the following statements concerning when and how to use an eyewash are true EXCEPT: Flush the eyes with water for a minimum of 15 minutes., Know the location and how to use the eyewash before handling chemicals., After flushing with water, the school nurse should examine the eyes to determine if further treatment is needed.

Back

Keep the eyes closed while flushing with water.

Front

A fire blanket is used for: Smothering flames when someone’s clothing or hair catches fire, Absorbing chemical spills, Extinguishing large fires, Protecting clothing and skin from chemical burns

Back

Smothering flames when someone’s clothing or hair catches fire

Front

A student mixed baking soda with lime juice. Which observation indicates a chemical change? Options: The mixture has the color of the lemon juice., The mixture tastes sour., A gas is released and is seen as bubbles., The baking soda can no longer be seen.

Back

A gas is released and is seen as bubbles.

Front

Which of the following questions CANNOT be used to decide whether a chemical change has taken place? Was there any precipitate formed?, Was there a change in size?, Was there a production of gas?, Was there a change in thermal energy?

Back

Was there a change in size?

Front

Which of the following is NOT an example of a chemical change? A glass falling down and shattering on the ground, Sodium metal bursting into flames when placed in water, Burning of coal, Tarnishing of silver

Back

A glass falling down and shattering on the ground

Front

Which image shows how Earth’s gravity acts on the falling ball? Options: A, B, C, D

Back

A

Front

What is the net force on the object shown in the picture below?

Back

40 newtons toward left

Front

In a tug of war competition between Team A and B, what will be the direction of the net force acting on the rope?

Back

The net force will act towards Team B.

Front

Alex is pushing a heavy box. The force he exerts is represented by the arrow. In order to make his task easier, in which direction should an additional force be applied?

Back

B