Y9 Topic 1

Question 1

What is an atom?

Answer 1

the smallest particle of a chemical element that can exist.

Question 2

What is a molecule?

Answer 2

A collection of two or more atoms held together by chemical bonds.

Question 3

How are the atoms in a molecule linked together ?

Answer 3

The atoms in a molecule are linked together through chemical bonds, which can be broadly of two types: Ionic Bonds(transfer through electrons) Covalent bonds(the equal sharing of electrons from both participating atoms).

Question 4

What is a compound?

Answer 4

A compound is a substance that contains two or more elements that are chemically combined. The elements in a compound are present in fixed proportions

Question 5

What are the three types of compounds?

Answer 5

Ionic, covalent (molecular)

Question 6

What is an Element?

Answer 6

A substance made of one type of atom only.

Question 7

What are the chemical formulae of the elements neon, nitrogen and sodium?

Answer 7

Ne
N2
Na

Question 8

How many elements are in Na2CO3?

Answer 8

3 Na2|C|O3

Question 9

What is an electron?

Answer 9

a negatively charged subatomic particle that has almost no mass

Question 10

How many electrons can you fit into a proton?

Answer 10

2000

Question 11

What is a proton?

Answer 11

the positively charged particles which are present in the nucleus of an atom and have a charge of plus 1

Question 12

Why are protons so important?

Answer 12

it gives the atom its identity according to the number of protons in an atom

Question 13

What is a neutron?

Answer 13

subatomic particles found inside the nucleus of every atom

Question 14

What does a neutron do?

Answer 14

help stabilise the nucleus of an atom

Question 15

What is a solution?

Answer 15

solution is a special type of mixture composed of two or more substances

Question 16

What is an example of a solution?

Answer 16

Salt water/ sugar dissolved in water/ rubbing alcohol

Question 17

What is a solvent?

Answer 17

A liquid in which a substance dissolves in is called the solvent

Question 18

What is an example of a solvent?

Answer 18

Water, methanol, acetone, ethanol

Question 19

What is a solute?

Answer 19

A substance that is dissolved in a solution

Question 20

What is an example of a solute ?

Answer 20

Salt, antifreeze, sugar

Question 21

How do you balance a chemical equation?

Answer 21

First, count the atoms on each side. Second, change the coefficient(amount) of one of the substances. Third, count the numbers of atoms again and, from there, repeat steps two and three until you’ve balanced the equation.

Question 22

Is this equation balanced- Ca + Cl2 → CaCl2.

Answer 22

Yes

Question 23

What is a reactant?

Answer 23

Reactants are the starting materials in a reaction that undergo a chemical change to form a product

Question 24

Which part of the word equation is the reactants

Mg+HCL—>MgCl2+H2

Answer 24

Before the arrow

Question 25

What is a product?

Answer 25

A product is where substances are being chemically bonded together