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Elements
Acids
Bases
Reactions
Molecules
100
These elements are ductile and malleable and conduct electricity.
Metals
100
What type of ions are released when an acid is mixed with water?
H+
100
What ions do bases release when they are mixed with water?
OH-
100
Where are the reactants shown in a chemical equation?
They are shown on the left side of the arrow.
100
If a substance is only made up of one type of atom, what is it called? If a substance is made up of at least two atoms attached to each other, what is it called?
Element Molecule
200
Chlorine has 17 electrons and 17 protons. What is its atomic number?
17
200
If a substance is an acid, what will its pH be?
Less than 7.0
200
If a substance is a base, what will its pH be?
Greater than 7.0
200
What is the Law of Conservation of Mass?
Matter cannot be created or destroyed.
200
How many oxygen atoms are there in a single molecule with the formula H2SO4?
4
300
Chlorine is a gas at room temperature. What type of element is it?
Nonmetal
300
What will occur when red litmus paper is dipped in an acidic solution?
There will be no color change.
300
What will occur when red litmus paper is dipped in an alkaline solution?
It will turn blue.
300
What are two of the four signs that a chemical change is occurring?
Change in color Production of a gas or solid Production of an odor Production of light
300
If a molecules has the formula 6CO2, what is the coefficient and what is the subscript?
Coefficient - 6 Subscript - 2
400
Copper has a melting point of 1083°C and a boiling point of 2567°C. What state will it be in if it is at 1524°C?
Liquid
400
If a molecule releases H+ very easily, what type of acid is it considered to be?
A strong acid
400
If a molecule releases a few OH- ions when mixed with water, what type of base is it considered to be?
A weak base
400
Is the following reaction balanced? Why or why not? 2H2O → 2H2 + O
No, there are two oxygens in the reactants but only one oxygen in the products.
400
How many total atoms of Fe are there in 4Fe2O3
There are 8 Fe atoms (four molecules, each with 2 atoms of Fe).
500
Sulfur has a melting point of 113°C and a boiling point of 445°C. If a sample of sulfur is heated from 225°C to 675°C, what is this change of state called?
Vaporization
500
What group of elements produces strong acids and which one of these acids is the strongest?
Halides - HI
500
What two groups on the periodic table produce strong bases?
Alkali metals and alkali earth metals.
500
Is the following reaction balanced Zn + CuSO4 → ZnSO4 + 2Cu If 25 grams of Zn are added to 50 grams of CuSO4, what will the mass of the products be?
No, there are two Cu atoms in the products but only one Cu atom in the reactants. The mass of the products will be 75 grams.
500
If an atoms loses or gains an electron, what is it called? If an atom gains an electron, what will its charge be?
Ion Negatively charged