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Year 8 Chemistry

Year 8 Chemistry Revision

QuestionAnswer
Is an electron :a) negatively charged b) neutrally charged c) positively charged a) Electrons are negatively charged
Is a neutron a) negatively charged b) neutrally charged c) positively charged b) Neutrons are neutrally charged
Is a proton a) positively charged b) neutrally charged c) positively charged c) Protons are positively charged
Do metals: a) conduct electricity b) not conduct electricity a) Metals conduct electricity
Are metals maliable? Yes, metals are maliable
Are metals ductile? Yes, metals are ductile
Are metals brittle? No, metals are not brittle.
Do metals conduct heat? Yes, metals conduct heat
Are metals located: a) on the left side of the periodic table b) in a column down the right side of the periodic table c) across a few groups on the right hand side of the periodic table a) Metals are located on the left side of the periodic table
The non-metals are :a) on the left side of the periodic table b) in a column down the right side of the periodic table c) across a few groups on the right hand side of the periodic table c) the non-metals are across a few groups on the right hand side of the periodic table
True or False: Elements contain only one type of atom? True. Elements are made of only one type of atom
True or False: Compounds contain only one type of atom. False. Compounds are made of more than one type of atom, in a fixed ratio. EG H20 is a compound which contains twice as much hydrogen as oxygen
True or False: The production of a gas is a sign of a chemical reaction. True. The production of a gas does show a chemical reaction has occured
Name 2 signs of a chemical reaction The signs of a chemical reaction are:* change in mass* change in temperature* production of a gas* formation of a precipitate* permanent change in colour* production of light
What is a precipitate? A precipitate is a solid formed when 2 liquids are mixed. It is a sign that a chemical reaction has occurred.
What is an element's atomic number? An atom's atomic number is the number of protons in an atom's nucleus.
What is an element's mass number? The mass number is the number of protons + neutrons in an atom's nucleus.
In a atom, how many electrons are there compared with the number of protons? In a n atom, the number of electrons is EQUAL to the number of protons.
A chemical that increases the rate of a reaction without being consumed by the reaction is called? A catalyst
True or False: Increasing temperature decreases the speed of a chemical reaction False. Higher temperature increases reaction speed
True or False: Decreasing the size of particles decreases the speed of a chemical reaction. False. Smaller particles react faster.
Does stirring increase the speed of a chemical reaction? Yes, stirring increases the rate of a chemical reaction.
Can a physical change be easily reversed? Yes
Can a chemical change be easily reversed? Not ususally
What is a sign of a chemical change? Permanent change in colour Production of a gas Generation of light, heat or absence of heat
How do we write a chemical equation? reactants --> products
What is the Periodic Table? a list of the elements in order of increasing atomic mass. The groups show the properties.
How are the groups shown on the Periodic table? There are 18 groups, given as columns
How are the periods arranged on the Periodic table? There are 7 periods, given as rows
Created by: srolfe