Rates,Atomic Structure, acids + bases and formulae

Question 1

state what happens when a chemical reaction takes place

Answer 1

Reactants react with each other

Question 2

state four changes which could indicate a chemical reaction has taken place

Answer 2

Change in colour, temperature change, light may have been produce and formation of gas

Question 3

what happened to the calcium making it disappear ?

Answer 3

A chemical reaction

Question 4

what is fizz in a chemical reaction

Answer 4

carbon dioxide bubbles

Question 5

Whats an unnoticable feature in a chemical reaction ?

Answer 5

Temperature

Question 6

How can the temperature be seen ?

Answer 6

Thermometer

Question 7

Suggest one advantage using a gas syringe has compared to collecting gas over

Answer 7

One advantage of using a gas syringe is it has a precise scale

Question 8

The pH scales is a numbered scale from below ??? to above ????

Answer 8

zero, 14

Question 9

Acids have a pH ???? 7

Answer 9

below

Question 10

Alkali have a pH ????? 7

Answer 10

above

Question 11

Neutral solutions have a pH of ????? 7

Answer 11

Exactly

Question 12

what colour would the indicator if a solution of ph of 1

Answer 12

Red

Question 13

what colour would the indicator be if a solution of pH 14

Answer 13

Purple

Question 14

A solution with a pH of 1 is (more or less) acidic than a solution with pH of 6 ?

Answer 14

More

Question 15

A solution with a pH of 8 is (more or less) alkaline than a solution with pH 14 ?

Answer 15

Less

Question 16

State what is meant by the Atomic Number of an element.

Answer 16

the number on the periodic table that equals the number of protons in the nucleus of the atom.

Question 17

how can atoms be neutral if they contain positive and negative particles

Answer 17

they contain equal numbers of positive protons and negative electrons

Question 18

what is the mass number of an element

Answer 18

the total number of protons and neutrons in its nucleus

Question 19

what name is given to these groups of atoms bonded together

Answer 19

A molecule

Question 20

what name is given to the bond formed between non-metals atoms

Answer 20

covalent bonding

Question 21

how is the bond between non-metals formed

Answer 21

covalent bonding

Question 22

what name is given to metal and non metal charged atoms

Answer 22

Ionic Compounds

Question 23

what type of charge is formed on a metal atom

Answer 23

positively charged ions

Question 24

what type of charge is formed on a non- metal atom

Answer 24

Negative Charged ions

Question 25

How are charged atoms formed

Answer 25

Gaining electrons or losing electrons creates an ion

Question 26

what bond is formed when sodium and chlorine react

Answer 26

Ionic Bond