WorksheetsCHEMISTRY 8
Total questions: 14
Worksheet time: 8mins
Which model of a chemical reaction illustrates the law of the conservation of mass?
Two clear liquids are mixed together in a beaker.What evidence suggests that a chemical reaction occurred?
The mixture remained clear
The liquids separated
The mixture became warm
The liquids became uniform
A fry pan being heated by a hot stove is a good model of (a)
A fry pan being heated is a good model of conduction because thermal energy is being transferred (a)
A design for a hand warmer is shown below. When the metal disk is bent, the dissolved chemicals begin crystallizing around the disk and spread throughout the container. As the chemicals crystallize, they release heat. However, the container gets so hot that it is uncomfortable against skin. Which design modification would best address this problem?
using a larger metal disk
making the plastic container more rigid
wrapping an insulator around the container
replacing the metal disk with a plastic disk
WHICH OF THE FOLLOWING ARE EXAMPLES OF CONDUCTION? (a)
Which are examples of convection? (a) (b)
Which is an example of radiation? (a)
Food becoming hot in the pan is a good model for (a)
food becoming hot in the pan is an example of conduction because thermal energy is being transferred by (a)
(a) is made up of different substances that may be separated by physical means.
milk is made up of different substances that may be separated by physical means; therefore, it is classified as (a)
A student noticed that when he squeezed on an air-filled latex balloon, the balloon's shape changed. Where he compressed the balloon between his hands, the volume of air decreased. However, that air pushed outward, causing the balloon to expand in other places. He made the same observations when he filled a latex balloon with water and compressed it between his hands. It was difficult to see whether the overall volume of the gas or water actually changed
Which two statements best explain why the syringe is better than the balloon for investigating how compression affects volume?
The syringe holds its shape.
The syringe is transparent.
The syringe has units of measurement.
The syringe is smaller.
The syringe can be filled more easily.
Which best explains why the plastic syringe is more rigid than the latex balloon?
The plastic is a solid, while the latex is a liquid.
The plastic is made up of a different arrangement of atoms than the latex.
The plastic has a cooler temperature than the latex.
The plastic particles have no empty space between them, but the latex particles do.
