Matter and elements

Question 1

Matter is made up of discrete particles.

Answer 1

True

Question 2

If an atom loses electrons, it becomes negatively charged.

Answer 2

False

Question 3

There are empty spaces in between the particles of matter.

Answer 3

True

Question 4

The particles in solids are closely packed and orderly arranged.

Answer 4

True

Question 5

Chemical reactions change the way the atoms are grouped together.

Answer 5

True

Question 6

In an endothermic reaction, the temperature of the surrounding drops.

Answer 6

True

Question 7

The mass number of an element is the number of protons plus electrons of an atom.

Answer 7

False

Question 8

In Thomson’s atomic theory, it was stated that all atoms of a given element are identical

Answer 8

False

Question 9

John Dalton on his atomic model found out that an atom consists of protons and electrons.

Answer 9

True

Question 10

A dry ice which changes from ice to a visible fog when exposed to air is an example of deposition.

Answer 10

False

Question 11

Iodized table salt

Answer 11

mixture

Question 12

Ethyl alcohol

Answer 12

compound

Question 13

Oxygen dissolved in water

Answer 13

mixture

Question 14

Chromium

Answer 14

element

Question 15

Pure water

Answer 15

compound

Question 16

Cooking an egg

Answer 16

endothermic

Question 17

An ice cube melting

Answer 17

endothermic

Question 18

Burning candle on a cake

Answer 18

exothermic

Question 19

Dissolving salt on your hand with a bit of water

Answer 19

exothermic

Question 20

Plants using energy from the sun to make their own food

Answer 20

endothermic