Conservation of mass
If 10 g of hydrogen reacts completely with 80 g of oxygen to form water, what is the mass of water formed?
90 g
Put the following metals in order from most reactive to least reactive: magnesium, copper, sodium.
sodium, magnesium, copper
Pressure is the force acting on a surface. What is the formula for pressure in solids?
Pressure = Force ÷ Area
When a gas is squeezed into a smaller volume, what happens to its pressure?
What is the rule that states the angle of incidence equals the angle of reflection?
The law of reflection.
Magnesium reacts with oxygen to form magnesium oxide. If 12 g of magnesium reacts completely with oxygen, the mass of magnesium oxide formed is 20 g. How much oxygen reacted?
8 g
Which metal would react more vigorously with water: calcium or iron? Explain your answer using the reactivity series.
What is the formula for fluid pressure, and which three factors affect the pressure in a fluid?
Fluid pressure = density × gravitational field strength × depth
P=⍴gh
If the temperature of a gas increases, how does this affect the volume of the gas?
The volume increases
What do we call the angle between the incoming ray of light and the normal to the mirror?
Angle of incidence.
A solution containing 10 g of salt and 90 g of water is mixed with another solution containing 20 g of salt and 150 g of water. Half of the total water is then evaporated. What is the final mass of the solution?
150 g
What type of reaction occurs when a more reactive metal pushes a less reactive metal out of its compound, for example when zinc reacts with copper sulfate to form zinc sulfate and copper?
displacement
A block has a mass of 1 kg and rests on a flat surface.
The block exerts a pressure of 500 Pa on the surface.
Take g=10 N/kg
Calculate the area of contact between the block and the surface.
P = F/A
F/P = A
10 N/500 Pa = A
1/50 m2 or 0.02 m2
Which gas law states that the volume of a gas is inversely proportional to its pressure?
Boyle's Law
Describe three properties of the image formed by a plane mirror? (hint: orientation etc)
Upright, the same size as the object, and the same distance behind the mirror as the object is in front.
Balance the following equation to show conservation of mass:
Mg + O₂ → MgO
Balanced answer: 2Mg + O₂ → 2MgO
Why does gold not react with acids?
Because gold is below hydrogen in the reactivity series.
Two open containers hold different liquids.
Container A contains oil of density 800 kg m⁻³ to a depth of 1.2 m
Container B contains water of density 1000 kg m⁻³ to a depth of 0.96 m
Take g = 10 N/kg
Calculate the pressure at the base of each container.
Which container exerts the greater pressure?
A 800 x 1.2 x g = 8 x 12 x 10 x g = 960 x g
B 1000 x 0.96 x g = 10 x 96 x g = 960 x g
The pressure at the base of both containers is the same: 9600 Pa
State Charles’s law.
Charles’s law states that the volume of a gas increases as its temperature increases, provided the pressure is kept constant.
What do we call the effect in a plane mirror that causes left and right to appear reversed? (hint L..... I....)
Lateral inversion
In an experiment, 12 g of magnesium reacts completely with 8 g of oxygen to produce 20 g of magnesium oxide.
magnesium + oxygen → magnesium oxide
If 18 g of magnesium reacts with oxygen under the same conditions, how much magnesium oxide would be produced? Explain your reasoning.
magnesium + oxygen → magnesium oxide
12 : 8 : 20
x every value by 1.5
18 : 12 : 30
30 g
Which non-metal, shown in the reactivity series, is used to displace iron from iron oxide during the extraction of iron?
carbon
A solid metal cube has a volume of 1.0 m³.
The top of the cube is 5 m below the surface of pure water, so the cube is completely submerged.
The density of water is 1000 kg/m³.
Take g = 10 N/kg.
Calculate the upward force (upthrust) acting on the cube.
Ptop = pgh = 1000 x 10 x 5 = 50,000 N
Pbottom = pgh = 1000 x 10 x 6 = 60,000 N
difference = 10,000 N
What do we call the constant tiny ‘banging’ of gas particles against the walls of their container?
collisions
What type of image appears to come from behind the mirror, cannot be projected onto a screen, and is formed when light rays do not actually meet? (hint: not real)
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