A Put on your thinking cap
5. Match
Ph
a.
b. Sa
c. c
d. I
1. Answer the following questions.
a. How can you find out the likeness and difference between objects?
b. How are liquids and solids alike?
c. How are liquids and solids different?
d. What is the difference between liquids and molecules?
e. What is a chemical change? How is it different from a physical change?
f. Give three examples of physical change and chemical change.
e.
f.
HE
2. What is the difference between:
W
a. Sugar in water and pebbles in water?
2.
b. Oil in water and milk in water?
3. Name the following:
Petrol
wood
a. A liquid that is used as fuel
Answers
Answer:
Explanation:
Water can take many forms. At low temperatures (below 0oC ), it is a solid. When at "normal" temperatures (between 0oC and 100oC ), it is a liquid. While at temperatures above 100oC , water is a gas (steam). The state that water is in depends upon the temperature. Each state has its own unique set of physical properties. Matter typically exists in one of three states: solid, liquid, or gas.
We are all familiar with matter. The definition of Matter is anything that has mass and volume (takes up space). For most common objects that we deal with every day, it is fairly simple to demonstrate that they have mass and take up space. You might be able to imagine, however, the difficulty for people several hundred years ago to demonstrate that air had mass and volume. Air (and all other gases) are invisible to the eye, have very small masses compared to equal amounts of solids and liquids, and are quite easy to compress (change volume). Without sensitive equipment, it would have been difficult to convince people that gases are matter. Today, we can measure the mass of a small balloon when it is deflated and then blow it up, tie it off, and measure its mass again to detect the additional mass due to the air inside. The mass of air, under room conditions, that occupies a one quart jar is approximately 0.0002 pounds. This small amount of mass would have been difficult to measure in times before balances were designed to accurately measure very small masses. Later, scientists were able to compress gases into such a small volume that the gases turned into liquids, which made it clear that gases are matter.