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Chemistry Exam Revis

Chemistry Exam Revision

QuestionAnswer
What charge does a proton have? Positive (+)
What charge does a neutron have? Neutral (0)
What charge does an electron have? Negative (-)
Where are protons found? In the nucleus.
Where are neutrons found? In the nucleus.
Where are electrons found? In electron shells around the nucleus.
What is the atomic number? The number of protons.
What is the mass number? The number of protons + neutrons.
What is an isotope? Atoms of the same element with the same number of protons but different numbers of neutrons.
What stays the same in isotopes? Number of protons.
What changes in isotopes? Number of neutrons.
How many electrons fit in the first shell? 2
How many electrons fit in the second shell? 8
How many electrons fit in the third shell? 8
What does the period number tell you? The number of electron shells
What does the group number tell you? The number of outer shell (valence) electrons
What is an ion? An atom that has gained or lost electrons
What happens when an atom loses electrons? It becomes a positive ion
What happens when an atom gains electrons? It becomes a negative ion
In ionic bonding, which element loses electrons? The metal
In ionic bonding, which element gains electrons? The non-metal
How do you name an ionic compound? Metal name first, non-metal ending in "-ide"
What is a hydrocarbon? A compound made of hydrogen and carbon
What is the word equation for combustion? Hydrocarbon + Oxygen → Carbon Dioxide + Water
What does collision theory state? Particles must collide correctly for a reaction to occur
What four factors increase the rate of reaction? Temperature, concentration, surface area, catalyst
What is a catalyst? A substance that speeds up a reaction without being used up
Acid + Metal → ? Salt + Hydrogen
Acid + Metal Hydroxide → ? Salt + Water
Acid + Metal Oxide → ? Salt + Water
Acid + Metal Carbonate → ? Salt + Water + Carbon Dioxide
What is the independent variable? The variable you change
What is the dependent variable? The variable you measure
An element has the electron configuration 2,8,1. What group and period is it in? Group 1, Period 3
What must happen to charges in an ionic compound? The positive and negative charges must balance
Why is MgCl₂ written with a 2 after the Cl? Mg²⁺ needs two Cl⁻ ions to balance the charges
Created by: lucydominguez47
 

 



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