Unit 2 States Of Matter, Water Cycle , chemical Elements Etc

Question 1

Which state of matter has the strongest forces between its particles?

Answer 1

Solids

Question 2

Which state of matter has particles that do not touch one another?

Answer 2

Gas

Question 3

Which state of matter has particles that are close together in a regular pattern?

Answer 3

Solid

Question 4

Which state of matter has particles that are closely packed but not in a regular pattern ?

Answer 4

Liquid

Question 5

Explain what happens when a puddle of water on a pathway dissapears on a warm day?

Answer 5

When a puddle on water dissapears it is because when the air is warm the water evaporates into water vapour . Then the particles get extra energy and the water puddle goes from liquid to gas

Question 6

Pick the correct answer ?

Answer 6

The correct answer is ì and ii

Question 7

A liquid changes to a solid when it freezes . Describe what happens to the particles during this process ?

Answer 7

When the liquid is cooling there is less energy being transferred to the particles so they vibrate less, slow down then become a solid

Question 8

Pick the correct answer?

Answer 8

A= Precipitation
B= Condensation
C= Evaporation

Question 9

Pick the correct answer?

Answer 9

Diagram A is the atoms of an element
Diagram B is the atoms of a compound
Diagram C is the particles of an element
Diagram D is the particles if a compound

Question 10

What is the symbol of magnesium ?

Answer 10

Mg

Question 11

What are the symbols of all the metal elements?

Answer 11

Li Be
Na Mg
Ca Al
K

Question 12

What is the name of the element P?

Answer 12

P= Phosphorus

Question 13

Explain why scientists use symbols for the elements?

Answer 13

Because it eliminates the need to write out the full name

Question 14

Why do some elements have 2 letters in their symbol?

Answer 14

Because if all elements had 1 letter some elements could get confused so 2mletters helps to differentiate symbols