science revision

Question 1

What is an element

Answer 1

a basic substance made of only one type of atom

Question 2

What is the symbol for iron

Answer 2

Fe

Question 2

What is the symbol for sodium

Answer 2

Na

Question 3

Is oxygen a metal or a non metal

Answer 3

non metal

Question 4

Do all metals end in (ium)

Answer 4

No, for example zinc

Question 5

How can you tell that something is a physical change

Answer 5

When there is a change of size, change of shape, change of state and are reversable

Question 6

How can you tell that something is a chemical change

Answer 6

When there is fizzing (new substance changed into a gas), change of colour, temperature changes, change of smell, light energy that is given out and it is hard to be reversed.

Question 7

Is a raw egg being cooked into a fried egg a physical or chemical change and why

Answer 7

Chemical because there is a change of colour, temperature, smell and it can’t be reversed.

Question 8

Is turning water into ice a chemical or physical change and why

Answer 8

Physical because there is a change of size, shape and it can be reversable

Question 9

Is baking a cake a chemical of physical change and why

Answer 9

Chemical because there is a change of smell, colour, temperature and can’t be reversed

Question 10

Is boiling water to make steam a physical or chemical change and why

Answer 10

Physical because there is a change of state and can be reversable

Question 11

Write the word equation for when magnesium reacts with oxygen it produces magnesium oxide

Answer 11

magnesium + oxygen —-> magnesium oxide

Question 12

Write the word equation for when Hydrochloric acid is formed when hydrogen reacts with chlorine

Answer 12

hydrogen + chlorine —–> Hydrochloric acid

Question 13

Copper oxide is produced when copper and oxygen react together

Answer 13

Copper + Oxygen ———> Copper oxide

Question 14

Sodium reacts with chlorine to produce sodium chloride

Answer 14

Sodium + Chlorine ——–> Sodium Chloride

Question 15

what are the properties of metals when solid

Answer 15

Good conductor of electricity, good conductor of heat, shiny, high density (heavy for its size), malleable (you can hammer it into different shapes) and ductile (able to bend but it wont break)

Question 16

what are the properties of a typical non-metal (when solid)

Answer 16

poor conductor of electricity, poor conductor of heat, dull, low density (light for its size), brittle (breaks easily)

Question 17

What is puberty

Answer 17

the process of physical changes through which a child’s body develops over time into an adult is called puberty

Question 18

What is adolescence

Answer 18

The period of time during which a young person develops from a child into an adult is called adolescence

Question 19

What is the difference between puberty and adolescence

Answer 19

Adolescence is both physical and emotional changes but puberty is just physical.

Question 20

what are the male and female sex hormones

Answer 20

Testosterone for males and Estrogen and Progesterone for females

Question 21

what does Oestrogen do

Answer 21

Responsible for the development of the female reproductive system. - Breasts grow larger, hips get wider and pubic hair grows

Question 22

what does Testosterone do

Answer 22

Responsible for the development of the male reproductive system. - Voice gets deeper, more muscular, and pubic hair grows.

Question 23

What is the definition of Fertilisation

Answer 23

Fertilization is the process in which the nucleus of a sperm cell fuses with the nucleus of an egg cell to produce a zygote.

Question 24

what is the function of the ovary? Give two things

Answer 24

To produce the egg and the sex hormones Estrogen and Progesterone

Question 25

What is the function of the testies

Answer 25

To produce sperm and the male sex hormone Testosterone

Question 26

How is a sperm cell adapted to its function

Answer 26

It has lots of Mitochondria for energy and a Flagellum to swim and meet the egg

Question 27

what is the function of the Cilia

Answer 27

The Cilia move the Eggs from the Ovary through the Oviducts / Fallopian tubes to the Uterus to meet with the Sperm

Question 27

What is Implantation

Answer 27

The fertilized egg (ball of cells) now attaches / implants into the wall of the Uterus (womb). When this happens the women is now pregnant

Question 28

What function does the Urethra perform in the male body

Answer 28

Its a tube that carries urine (wee) from the penis out of the body, and sperm from the sperm duct.

Question 29

What is the function of a penus

Answer 29

The penis allows the male to release sperm into a female during sexual intercourse. It also carries urine from the Urethra out of the body

Question 30

What is the function of the Uterus

Answer 30

It is the womb where a fetus develops until it is born

Question 31

What is the function of the Cervix

Answer 31

It is a ring of muscle at the entrance to the uterus that keeps the fetus in place when the women is pregnant

Question 32

What are the Ovarys

Answer 32

The Ovarys contain the egg cells. One egg is released each month.

Question 33

how many chromosomes do Sperm and egg cells have

Answer 33

23 (which is half the normal amount as the egg and sperm fuse together to form 46 chromosomes.

Question 34

What happens in stage one of the Menstrual cycle (days 1-6)

Answer 34

If the egg is not fertilized- the lining of the uterus is not needed so so shed from the woman's body bleeding lasts 2-5 days and is called a period.

Question 35

What happens in stage two of the Menstrual cycle (days 6-10)

Answer 35

The lining of the woman's Uterus starts to regrow ready for if she becomes pregnant. It is made up of spongey tissue.

Question 36

What happens in stage three of the Menstrual cycle (days 10-14)

Answer 36

Another egg is ready to be to be released from the ovary, waiting to be fertilized when the egg is released it is called ovulation.

Question 37

What happens in stage four of the Menstrual cycle (days 15-28)

Answer 37

Woman's Uterus thickens ready for a potential pregnancy few days after the woman's egg is released and she can become pregnant we call this fertile.

Question 38

What are the Oviducts

Answer 38

The Oviducts are the tubes that carry the egg into the Uterus where it will wait till it meets the Sperm.