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CHEM: BONDING
PHY: DENSITY
CHEM: SALT
PHY: VACCUM
CHEM: SALTS 2
100

Charge for protons

positive

100

Equation for density along with the correct unit.

density = mass (g) / volume (cm3)

100

A list of metals in order of how reactive they are.

reactivity series

100

In a wood fire, 70% of chemical energy in wood is changed to thermal energy. The remaining energy is changed to light and waste chemicals.

Calculate the % of the chemical energy in the wood that is changed to light and waste chemicals.

100-70= 30%

100

____SO4 + Fe --> Fe___ + Cu

CuSO4 + Fe --> FeSO4 + Cu

200

elements in the Periodic Table are arranged according to their?

proton number/ atomic number

200

A block of aluminium has a volume of 5.0 cm3 and a mass of 13.5g. Calculate the density of the aluminium.

Give your answer in g/cm3.

2.7 g/cm3

200

No reactions with oxygen, water and dilute acid.

Give 2 elements.

silver and gold.

200

In an oil-burning power station, 55% of the chemical energy in the oil is changed to thermal energy and 10% is used in the power station. The remainder is changed to electrical energy.

Calculate the % of the chemical energy in the oil that is changed to electrical energy.

55 + 10 = 65

100-65 = 35%

200

Lead + silver nitrate --->

Lead + silver nitrate ---> lead nitrate + silver

300

Sodium chloride, NaCl, is made up of sodium ions, Na+, and chloride ions, Cl −. 

Explain how the ions in sodium chloride are held together.

attraction between positive and negative ions

300

Aiko calculates the density of some objects. 

(a) A block of iron has a mass of 19.68 g.  The volume of the block is 2.50 cm3.  

(i) Write down the equation Aiko uses to calculate density.

ii) Calculate the density of Aiko's block of iron.  

i) (density =) mass/volume

ii)  7.87 (g  /  cm3)

300

Lucas wants to make zinc chloride. 

Write down the name of the metal and acid he uses to make zinc chloride.  

(metal) zinc 

(acid) (dilute) hydrochloric acid

300

Suggest how the shiny silver surfaces on the vacuum flask help to keep the liquid warm.

(idea that) shiny surface reflects thermal energy back into the liquid

300

Mike places a piece of aluminium metal in a test tube of copper sulfate.

How can Mike tell that a reaction has taken place?

If there has been a colour change in the

solution or the metal.

400

i) Name the type of bonding in a hydrogen molecule.

ii) explain why.. 

i) covalent, pair of shared electrons

ii) (chlorine atom) gains one electron (to make a chloride ion) 

400

Aiko calculates the density of four objects.  Look at her results. 

object               density in g  / cm3 

       A                      2.7 

       B                      8.4 

       C                      0.002 

       D                      13.6

Which object is a gas?

Explain your answer.  

C and has a (very) low density

400

Blessy makes some magnesium sulfate. 

She adds an excess of magnesium to some dilute sulfuric acid until the reaction stops. 

Unreacted magnesium is left at the bottom of the solution.

Describe how Blessy separates the magnesium sulfate solution from the unreacted magnesium.  

filtration or filtering

400

The vacuum does not contain any particles. Explain why the vacuum reduces the transfer of thermal energy.

convection cannot take place  

 conduction cannot take place

400

What is the difference between a base and an alkali?

A base is a metal oxide. If a metal oxide

dissolves in water, it makes and alkaline solution.

500

Look at the diagrams showing a chlorine atom and a chloride ion draw by your teacher.

Describe how a chloride ion is made from a chlorine atom.

(chlorine atom) gains one electron (to make a chloride ion)

500

A wooden block: 

Height: 4cm, Length: 6cm, width: 3cm

i) Calculate the volume in cm3

ii) The wooden block has a mass of 54g. Calculate the density in g/cm3.

i) 72 cm3

ii) 0.75 g/cm3

500

Blessy wants to make solid magnesium sulfate from the magnesium sulfate solution. 

Describe how she makes solid magnesium sulfate.

evaporation or evaporate the mixture

500

Gabriella removes the lid and the stopper from the vacuum flask. Some of the hot liquid evaporates. What happens to the temperature of the liquid that remains in the vacuum flask? Explain why. Use ideas about particles. 

3 marks = 3 points answer

1) (liquid) cools down or (temperature) decreases

2) high(er) energy particles (near the surface of the liquid) escape (into the  air) 

3)(average) energy of the remaining particles decreases

500

1) Al + CuSO4 ---> Al2SO4 + Cu

2) Al + Pb(NO3)2 --> Al(NO3)3 + Pb

3) Pb + CuSO4 ---> PbSO4 + Cu

4) Pb + AgNO3 --> Pb(NO3)2 + Ag

Decide, which of the 4 metals, Al, Cu, Pb or Ag is the most reactive.


Al