Chemistry

Question 1

Inside atoms there are?

Answer 1

Protons, Neutrons and Electrons

Question 2

NaCl is made up from?

Answer 2

1x Sodium and 1x Chlorine

Question 3

KNO^3

Answer 3

1x Protein, 1x Nitrogen, and 3x Oxygen

Question 4

2N^2O^2

Answer 4

4x Nitrogen, 4X Oxygen

Question 5

H^3PO^4

Answer 5

3x Hydrogen, 1x Phosphorus, 4x Oxygen

Question 6

CH^4+2O^2

Answer 6

CO^2+2H^2O

Question 7

A chemical reaction involves the ____ of ____in a chemical, forming a _____

Answer 7

Rearrangement, atoms, new substance

Question 8

The ingredients and called the _____and the substances that result from a chemical reaction are called the ______

Answer 8

Reactants, products

Question 9

Scientists use a shorthand method of writing the chemical reaction called the chemical ______ method

Answer 9

Equation

Question 10

What does the coefficient of a molecule tell us?

Answer 10

The coefficient tells us how many molecules or atoms of that substance are involved in the reaction.

Question 11

What does the subscript in a molecule tell us?

Answer 11

The subscript shows how many atoms of that element are in one molecule of the compound.

Question 12

What is Physical change?

Answer 12

Process where some of the physical properties of a substances change, but the chemical properties are still the same.

Question 13

What are 2 examples of Physical Change?

Answer 13

Ice melting or Chopping wood

Question 14

What is Chemical Change?

Answer 14

Involves a change in the chemical properties of a substance to form a new substance.

Question 15

What are 2 examples of Chemical Change?

Answer 15

Burning paper or metal rusting

Question 16

What are 3 or more evidence of Chemical Change?

Answer 16

Change in texture, Production of sound or light, Change in temperature, Permanent colour change, Gas produced

Question 17

Identify the following as Chemical or Physical change:
Burning magnesium ribbon,
Bursting a balloon, Rusting of iron,
Souring of milk into yoghurt,
Freezing water,
Melting ice-cream, writing with a pen, Cracking and egg open, Dynamite exploding, Tearing paper, Toasting bread

Answer 17

C, P, C, C, P, P, P, P, C, P, C

Question 18

____are different types of atoms. Elements are not boned to any other atom. When electrons of two or more atoms interact, they from a ____. Molecules can be made up of all the ____atoms or they can be made up of different atoms. If a molecule is made up of different atoms, it is called a ___. If molecule is made up of only one type of atom, then it is called an _____ ______.

Answer 18

Elements, molecule, same, compound, elemental molecule.