Edmodo revision sheet

Q1

define independent, dependant and controlled variable 

Independent -   Free from outside control

Dependant - something that relies on another 

Controlled variable - control variable has different meanings, depending on the area/place in which it is used. The control variable is something that is constant and unchanged in an experiment. 

Q2

When working with an acid you can prevent harmful risks by wearing the proper gear such as science glass. 

If you spill on your self and it hits your glasses instead of your eyes.

Q3

Models are used science because it is easier to understand things.

Chemistry

Q1 

What is the symbol for carbon, sodium, tungsten (you can use the periodic table)

Carbon=C, sodium=NA, tungsten=W

Q2

Define physical property and chemical property

Physical property's are colours, smell, appearances that do not change.

Chemical property's are pH levels, and reactivity.

Q3

Define an element, compound, molecule, mixtures, atomic number, atomic weight

Element- a group of protons, electrons, neutron

Compound- substances made up of 2 or more different element formed together.

Molecule- substances made up of 2 of the same elements.

Mixtures- 2 or more substances together that have no chemical change reaction.

Atomic number- atomic number tells you how many protons and electrons are in an atom

Atomic weight- protons plus the neutrons is the weight of the atom.

Q4

Name the element in group 3 period 3 

Scandium

Q5

Draw a picture of the boron atom