Atoms Y9 science

Question 1

dconservation of mass

Answer 1

In a chemical reaction mass is neither created nor destroyed

Question 2

conservation of energy

Answer 2

Energy is not created or destroyed but merely changes forms, going from potential to kinetic to thermal energy

Question 3

Kinetic energy

Answer 3

energy of motion, observable as the movement of an object or subatomic particle.

Question 4

Potential energy

Answer 4

the stored energy in an object due to its position, properties, and forces acting on it

Question 5

Useful energy

Answer 5

the energy that goes towards the desired output of the end-use application

Question 6

Element

Answer 6

a pure substance made of only 1 type of atom that can not be broken down further into other substances

Question 7

Molecule

Answer 7

two or more atoms connected by chemical bonds

Question 8

Compound

Answer 8

Compounds are substances which can be formed by chemically combining two or more elements.

Question 9

chemical reaction

Answer 9

a process in which one or more substances, also called reactants, are converted to one or more different substances, known as products

Question 10

Chemical equation

Answer 10

symbolic representations of chemical reactions in which the reactants and the products are expressed in terms of their respective chemical formulae.

Question 11

Exothermic

Answer 11

a chemical reaction that releases heat, causing the temperature of the immediate surroundings to rise

Question 12

Endothermic

Answer 12

Chemical reactions that absorb (or use) energy cooling the environment

Question 13

Combustion

Answer 13

chemical process in which a substance reacts rapidly with oxygen and gives off heat

Question 14

Products

Answer 14

the species formed from chemical reactions

Question 15

Reactants

Answer 15

a substance that takes part in and undergoes change during a reaction

Question 16

Greenhouse gases

Answer 16

gases in the earth’s atmosphere that trap heat

Question 17

The enhanced greenhouse effect

Answer 17

extra greenhouse gases in our atmosphere trap too much of the Sun’s energy

Question 18

The greenhouse effect

Answer 18

The greenhouse effect is the process through which heat is trapped near Earth’s surface by substances known as ‘greenhouse gases.’

Question 19

Fuel

Answer 19

material such as coal, gas, or oil that is burned to produce heat or power

Question 20

Emission

Answer 20

the production and discharge of something, especially gas or radiation

Question 21

Fossil fuels

Answer 21

a generic term for non-renewable energy sources

Question 22

Molecular formula

Answer 22

a chemical formula that gives the total number of atoms of each element present in a molecule.

Question 23

Compound

Answer 23

a substance made from two or more different elements that have been chemically joined

Question 24

Wasted energy

Answer 24

occurs when energy is produced but not used, or when it is used inefficiently

Question 25

Energy

Answer 25

the ability to do work

Question 26

Transport

Answer 26

take or carry (people or goods) from one place to another using a vehicle,

Question 27

What happens to energy during an endothermic reaction?

Answer 27

An endothermic reaction is any chemical reaction that absorbs heat from its environment.

Question 28

Where does the heat come from in an exothermic reaction?

Question 29

mixture

Answer 29

a combination of two or more pure substances in which each pure substance retains its individual chemical properties.

Question 30

Provide examples of current methods humans use to transport themselves and objects

Answer 30

boat,car,train,truck,plane

Question 31

Recall the types of kinetic energy

Answer 31

-elastic energy
-light energy
-sound energy
-thermal energy

Question 32

Recall the types of potential energy

Answer 32

-chemical
-gravitational
-mechanical
-nuclear

Question 33

a general equation for combustion

Answer 33

Fuel + oxygen = carbon dioxide + water + energy

Question 34

common types of fossil fuels

Answer 34

Coal
oil
natural gas

Question 35

3 impacts of fossil fuel emissions on the environment

Answer 35

-global warming
-worse air quality
-weakening ozone layer

Question 36

the thing in the top left of a element on the perotic table

Answer 36

atomic number

Question 37

the on the bottom middle

Answer 37

atomic mass

Question 38

fossil fuels

Answer 38

non-renable energy source