Christmas Test Flashcards
What is an element
An element is a substance that contains one type of atom only
Define the term an atom
An atom is the building block of a material. It contains of three substance particles
What mass is in a proton
1
What mass is in neutron
1
What mass is in an electron
1/1040
Define the term molecules
They consist of two or more atoms chemically combined
Define the term molecules of an element
Two or more particles of the same element eg hydrogen gas
Define the term molecules of a compound
Two or more atoms of a different element’s chemical composition eg water H2O
Name 3 alkali metals
Lithium,sodium and potassium
What are alkali metals
Alkali metals all have 1 electron on the outer shell which they want to loose. This makes them very reactive
Where are alkali metals stored
Stored under oil to stop them from tarnishing (reacting with O2)
What happens when alkali metals are put in water
They are less dense than water so they float. They also fizz across the surface as they melt into a ball. Steam is released of due to heat released. Litumes paper turns blue as it is now an base and not an acid
What happens when alkali metals are put in water
They are less dense than water so they float. They also fizz across the surface as they melt into a ball. Steam is released of due to heat released. Litumes paper turns blue as it is now an base and not an acid
Define the term atomic number
the number of protons in the nucleus of an atom
Define the term mass number
the sum of the numbers of protons and neutrons present in the nucleus of an atom
What are protons
is a subatomic particle with a positive electric charge
What are neutrons
an uncharged atomic particle
Define the term electron
negatively charged subatomic particle that can be either bound to an atom or free
What is the second group called
Alkaline earth metals
How are alkaline earth metals alike
They all have 2 outer electrons they don’t want
Name the 7 group
The halogens
How are the halogens alike
They all have 7 outer electrons and are very reactive as they want to gain one
What is group 8 called
The noble gasses
What do the Nobel gases all have on common
All have a full outer shell which makes them very un reactive
What do all the Nobel gases have in common
They all have a full outer shell which makes them very un reactive
Define the term chemical bounding
It’s when 2 or more elements join together chemically
What is ionic chemical bounding
It occurs between metal and nonmetal atoms. Metal atoms lose an electron while nonmetal ones gain one. Eg MgO
Define the term covalent chemical bounding
It occurs between nonmetal atoms which share electrons. eg. H2 and CO2
What happens during day 1-5 of the menstrual cycle
Your period starts as the lining of the womb gets released and comes out of the uterus
What happens during days 6-12 of the menstrual cycle
The lining of the womb builds up to prepare for pregnancy
What happens during day 14 of the menstrual cycle
Ovulation occurs and the egg gets released into the fallopian tube
What happens during days 16-28 of the menstrual cycle
The lining of the womb stays the same and waits for the next cycle to continue and the cycle stays over again
What happens during the fertile period
It is the time that a woman can get pregnant
What does the sperm duct do
It carries sperm cells to the penis
What happens in the testies
It is where the sperm is produced
What happens in the penis
It is the transfer and fusing together of sperm to the vagina
What happens on the scrotem
It is there to keep the temperature of the testies lower
How many copies of each gene does a person have in each cheak sell
2
What is meant be variation
It is the differences in the characteristics of the organisms
What is the name of the process which evolution occurs
Theory of natural selection
What does the womb do
It holds the foetus during pregnancy
What is the cervix
It is the neck of the womb
What does the vagina do
It is where the penis releases seaman and it’s the birth canal
What does the fallopian tube do
It carries the egg words the uterus
What does the overy do
The overy produces the egg
