Separation & Purification
List 2 ways you separate mixtures at home.
Straining rice, picking stones from grains, evaporation.
Which particles are found in the nucleus of an atom?
Protons & neutrons
Name 1 acid in food and 1 base in cleaning products.
Acid: vinegar, lemon; Base: baking soda, soap
Give 1 example of an exothermic change in cooking.
Burning gas, frying food
What’s the difference between speed and velocity?
(Velocity has direction
Which method is best to get salt from seawater?
Evaporation
Which is heavier: a proton or an electron?
Proton
What is the pH of a neutral solution?
7
Is melting ice endothermic or exothermic?
Endothermic
If a car travels 200 m in 20 s, what is its speed?
10 m/s
What property allows you to separate iron from sand?
Magnetism
Carbon-14 and Carbon-12 are examples of what?
Isotopes
Write the word equation: Hydrochloric acid + sodium hydroxide → ?
Sodium chloride + water
In an exothermic reaction, is more energy absorbed or released?
Released
What does the slope of a distance–time graph represent?
Speed
Name the process used to separate crude oil into different fuels.
Fractional distillation
How many electrons can the 1st shell hold?
2
What gas is released when acid reacts with a metal?
Hydrogen Gas
Describe the energy diagram of an endothermic reaction.
Products higher than reactants.
State Hooke’s Law.
Extension is directly proportional to force, within elastic limit
Chromatography separates mixtures based on what property?
Different solubilities/affinities
Write the electron configuration of sodium (Na)?
2,8,1
Why do farmers add lime (CaO) to soil?
To neutralize acidity
Breaking bonds absorbs energy; forming bonds releases energy. Which dominates in exothermic reactions?
Bond forming
A 2 kg ball accelerates at 3 m/s². What force is applied?
F = ma = 6 N