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WorksheetsChemistry
Total questions: 40
Worksheet time: 22mins
Chemistry is
a characteristic of a substance that can be observed without changing the substance into another substance
the study of matter and how matter changes
anything that has mass and takes up space
a rapid reaction between oxygen and a substance called a fuel
The only sure evidence for a chemical reaction is
the formation of a gas
a color change
the production of one or more new substances
changes in properties
When an atom loses an electron, it becomes a
positive ion
negative ion
neutral ion
Neutral atom
Magnesium bromide is an ionic compound with the chemical formula MgBr2. What does the "2" tell you?
Bromide has a 2- charge
There are two magnesium ions to every bromide ion
There are two bromide ions for every magnesium ion
Bromide has a 2+ charge
In the chemical formula for an ionic compound, which item is written first?
the name of the positive ion
the name of the negative ion
the subscripts
the charges
The chemical name for the compound with the formula Na2S is
Sodium fluoride
magnesium sulfide
lithium oxide
sodium sulfide
What is a double bond?
A bond between two atoms
one pair of electrons shared between two atoms
two pairs of eelctrons shared between two atoms
two pairs of electrons shared between four atoms
Electrons involved in bonding between atoms are
valence electrons
inside the nucleus
closest to the nucleus
positively charged
Which of the following groups contains the most reactive elements?
the alkali metals
the alkaline earth metals
closest to the nucleus
the noble gases
CaCO3 represents a chemical
symbol
formula
subscript
reaction
Which is the correct chemical equation for the following statement? Sodium reacts with oxygen in a 2 to 1 ratio to produce sodium oxide.
4Na + O2 --> 2Na2O
2Na + O2 --> 2NaO
Na2O + O2 --> 2NaO
Na2 + O2 --> Na2O2
THe principle of conservation of mass is true
only for reactions that take place in open systems
only for reactions that take place in closed systems
for reactions in both open and closed systems
for no reactions at all
In chemical reactions, what does the principle of conservation of mass mean?
Matter is not created or destroyed
The total mass of the reactants is greater than the total mass of the products
The total mass of the reactants is less than the total mass of the products
Matter is not changed
A liquid mixture in which particles can be seen and easily separated by settleing or filtration is a
solution
suspension
solvent
solute
Which is a characteristic property of acids?
They turn blue litmus paper red
They turn red litmus paper blue
They taste bitter
They do not react with metals
What is one way to increase the solubility of sugar in water?
Heat the water
Chill the water
Increase the amount of sugar
Decrease the amount of water
When you add so much solute that no more dissolves, you have a(n)
saturated solution
unsaturated solution
neutralization
suspension
Ionic bonds form between two ions that have
ionic compounds
negative charges
positive charges
opposite charges
Ions that are made of more than one atom are called
ionic compounds
crystals
polyatomic atoms
ionic bonds
Which is most likely to form a negative ion?
an element from Group 17
a metal
an element from Group 1
an element with atoms that have eight valence electrons
Which of the following is the correct name for MgCl2?
magnesium chlorine
magnesium dichlorine
magnesium chloride
magnesium dichloride
In an electron dot diagram, two pairs of shared electrons represents a
single bond
double bond
triple bond
quadruple bond
A nitrogen molecule (N2) has one triple bond. How many electrons do the nitrogen atoms share?
1
3
4
6
Compared to ionic compounds, molecular compounds generally have
good conductivity
greater densities
more chemical bonds
a low boiling point
Elements that have the same number of valence electrons are
within the same group of the periodic table
within the same period of the periodic table
called noble gases
called metalloids
Which of the following is true about chemical reactions?
They are accompanied by changes in energy
They form new substances with new properties
both A and B
neither A nor B
In an endothermic reaction, energy is
Absorbed
released
converted to mass
synthesized
Which of the following in NOT a physical property?
melting point
state of matter
density
flammability
Substances formed as a result of a chemical reaction are called
catalysts
precipitates
products
reactants
In a balanced chemical equation,
atoms are conserved
coefficients are equal
molecules are equal
energy is not conserved
Which of the following resuls in a chemical change in matter?
bending straw
boiling water
Braiding hair
burning wood
How can you balance a chemical equation?
change the coefficients
change the products
change the reactants
change the subscripts
In general, what happens when you increase the temperature of a reaction?
The heat destroys the reactants
The rate of the reaction decreases
The rate of the reaction increases
The rate of the reaction stays the same
Which of the statements about the effect of solutes on solutions is true?
Solutes raise the boiling point of a solvent
Water with a solute dissolved in it will freeze at zero degrees Celcius
Solutes raise the freezing point of a solvent
Antifreeze boils at a lower temperature than pure water
Which of the following statements about solutions is NOT true?
solutions are mixtures
Solutions contain a solvent dissolved in a solute
A solution has the same properties throughout
The solute in a solution can be a solid, liquid or gas
Which of the following is NOT a property fo an acid?
An acid is corrosive
An acid turns red litmus paper blue
An acid reacts with metals and carbonates
An acid tastes sour
Because it wears away certain materials, an acid is described as
concentrated
contaminated
corrosive
carbonated
Which of the following best describes bases?
They feel slippery and taste sour
They turn red litmus paper blue and react with metals
They taste bitter and react with carbonates
They turn red litmus paper blue and taste bitter
Which of the following substances is most likely to have a pH close to 7?
lemon
antacid
baking soda
vinegar
Which of the following is an example of a solution?
fog
soda water
milk
mud
