Science Worksheet

Front

Why did the liquid parts of a hard-boiled egg become solid after boiling?

Back

Heating changed the chemical bonds in the egg.

Front

How many different elements are in the compound sodium carbonate (Na2CO3)?

Back

3

Front

Dee adds five grams of a chemical to one liter of liquid and observes a reaction. If the reaction is endothermic, what will happen?

Back

The temperature of the liquid will decrease.

Front

A beam of light is shining on the surface of a liquid. Which diagram shows what happens when the light is reflected by the liquid? Options: A, B, C, D

Back

D

Front

Which property of a substance is chemical? Options: its density, its temperature, its melting point, its flammability.

Back

its flammability

Front

Which model represents phosphorus trichloride (PCl₃)? Options: Diagram A, Diagram B, Diagram C, Diagram D

Back

Diagram A

Front

Why did the ball thrown by Jerry fall to the ground after following a curved path?

Back

gravity changed the ball’s direction.

Front

The graph below relates distance and time for a moving object. What is the speed of the object represented by the graph above?

Back

2 m/s

Front

Which of the following is an example of heat transfer by conduction? Options: a whole metal spoon getting hot when one end is in hot soup, the inside of a car in the sun getting very hot, a tar road getting hotter in the sun than a concrete sidewalk, a fireplace fire heating a room on a cold day

Back

a whole metal spoon getting hot when one end is in hot soup

Front

In making a pizza, which process involves a chemical change?

Back

baking the dough to form the crust