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WorksheetsY8 - topic 2 - lesson 8: Consolidation
Total questions: 49
Worksheet time: 25mins
Complete the sentence:
In an element, all of the atoms are the (a) .
What is shown by this particle diagram?
an element
NOT an element
What is shown by this particle diagram?
an element
NOT an element
Complete the definition of a compound:
A substance made up of atoms of two or more different elements that are (a) joined together
What type of substance is shown in the particle diagram?
element
compound
mixture
What type of substance is shown in the particle diagram?
element
compound
mixture
What type of substance is shown in the particle diagram?
element
compound
mixture
What type of substance is shown in the particle diagram?
element
compound
mixture
What type of substance is shown in the particle diagram?
element
compound
mixture
Complete the definition of a mixture:
Something that contains different substances that are (a) chemically joined to each other
What is being described: A change that occurs when one or more substances change into entirely new substances with different properties.
chemical change
physical change
What is being described: A change in a substance that does not involve a change in its identity (the particles are the same, but they are behaving differently).
chemical change
physical change
A physical change is: a change in a substance that does not involve a change in its identity (the particles are the same, but they are (a) differently).
A chemical change is a change that occurs when one or more substances change into entirely new substances with different properties (the atoms are joined together in (a) arrangements).
Which of the following is a chemical change?
dissolving sugar in tea
boiling a kettle of water
melting chocolate
baking a cake
Which of the following is a physical change?
a nail rusting
snow melting
frying an egg
wood burning
Which of the following is NOT a chemical change?
meat cooking in an oven
milk turning sour
boiling an egg
salt added to soup
Which of the following is NOT a physical change?
sugar added to tea
perfume evaporating
nail rusting
water boiling
Which of the following is NOT a sign of chemical reaction?
Fizzing (effervescence)
Colour change
Change in temperature
Melting
Which of the following is NOT a sign of chemical reaction?
Appearance or disappearance of solids
Colour change
Evaporation
Absorption or release of light
Which of the following IS a sign of chemical reaction?
Appearance or disappearance of solids
Melting
Evaporation
Dissolving
Which of the following IS a sign of chemical reaction?
Change in temperature
Freezing
Evaporation
Sublimation
The 5 signs of a chemical reaction are: (a) , colour changes, changes in temperature, absorption or release of energy and the appearance or disappearance of solids.
The 5 signs of a chemical reaction are: fizzing, (a) changes, changes in temperature, absorption or release of energy and the appearance or disappearance of solids.
The 5 signs of a chemical reaction are: fizzing, colour changes, changes in (a) , absorption or release of energy and the appearance or disappearance of solids.
The 5 signs of a chemical reaction are: fizzing, colour changes, changes in temperature, absorption or release of (a) and the appearance or disappearance of solids.
Reactants are the (a) materials in a chemical reaction.
Products are the substances that are formed during a chemical reaction and that are present at the (a) .
What is being described here: The substances that are formed during a chemical reaction and that are present at the end.
reactants
products
What is being described here: The starting materials in a chemical reaction.
reactants
products
What are the reactants in this experiment: A lump of magnesium was dropped into a test tube of hydrochloric acid, the chemical magnesium chloride was formed. A gas was also being formed. This gas was hydrogen.
magnesium chloride and hydrogen
magnesium chloride and hydrochloric acid
hydrochloric acid and magnesium
magnesium
What are the products in this experiment: A lump of magnesium was dropped into a test tube of hydrochloric acid, the chemical magnesium chloride was formed. A gas was also being formed. This gas was hydrogen.
magnesium chloride and hydrogen
magnesium chloride and hydrochloric acid
hydrogen and magnesium
hydrogen
What are the reactant(s) in this word equation?
sodium and chlorine
chlorine and sodium chloride
sodium chloride
sodium chloride and sodium
What are the product(s) in this word equation?
sodium and chlorine
chlorine and sodium chloride
sodium chloride
sodium chloride and sodium
Complete the paragraph: In a chemical reaction no mass is lost or gained because atoms cannot be created or destroyed. This means that the total mass of reactants is (a) to the total mass of products.
Complete the paragraph: In a chemical reaction no mass is lost or gained because (a) cannot be created or destroyed. This means that the total mass of reactants is equal to the total mass of products.
In a chemical reaction, two solutions with masses of 25g are mixed together to form a blue solid. What is the mass of the blue solid?
50g
75g
25g
You can't tell
In a chemical reaction, two solutions with masses of 30g are mixed together in a beaker to form a green solid and a gas which escapes. What is the mass of the contents of the beaker after the reaction?
60g
more than 60g
less than 60g
100g
In a chemical reaction, a solid with a mass of 50g reacts with oxygen in the air to form a new compound. What is the mass of the compound formed after the reaction?
50g
more than 50g
less than 50g
40g
Why might the mass of the products appear to be lower than the mass of the reactants after a chemical reaction has taken place?
a solid forms which is very light
a solution forms which has a low density
a gas is released
it changes colour
Why might the mass of the products appear to be higher than the mass of the reactants after a chemical reaction has taken place?
a solid forms which is very heavy
a solution forms which has a high density
one of the reactants was a gas
it changes colour
An (a) reaction is one that involves a decrease in temperature as heat energy is absorbed.
An (a) reaction is one that involves an increase in temperature as heat energy is released.
What type of reaction is being described: a reaction that involves a decrease in temperature as heat energy is absorbed.
endothermic
exothermic
What type of reaction is being described: a reaction that involves an increase in temperature as heat energy is released.
endothermic
exothermic
The temperature of the reactants is found to be 20oC. After a chemical reactions taken place, the products are found to have a temperature of 50oC. What type of reaction took place?
endothermic
exothermic
The temperature of the reactants is found to be 20oC. After a chemical reactions taken place, the products are found to have a temperature of 10oC. What type of reaction took place?
endothermic
exothermic
The temperature of the reactants is found to be 18oC. After a chemical reactions taken place, the products are found to have a temperature of 6oC. What type of reaction took place?
endothermic
exothermic
The temperature of the reactants is found to be 22oC. After a chemical reactions taken place, the products are found to have a temperature of 27oC. What type of reaction took place?
endothermic
exothermic
