Fireworks are different colors because they contain different elements. These colors occur when

atoms of various elements emit light @ different frequencies

Archimedes’ principle states the buoyant force acting on anobject

Equals the volume of the fluid displaced by the object

Higher viscosity liquids

Takes longer to pour than low viscosity ones

Electronegativity of an element is the

attraction an atom has for shared electrons-covalent bonds

Elements in the same column, group, have similar properties because

they have the same number of valence electrons

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1st semester physical science test review

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Physical Science Review

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Questions 21

Answers

1
At higher altitudes,steam escape from the liquid easier due to a lower air pressure. Therefore,
water boils at higher temps
water will not boil
water boils at the same temp
water boils at lower temps
2
Which scientist used the gold foil experiment to find the atomic nucleus?
JJ Thompson
Neils Bohr
John Dalton
Ernest Rutherford
3
Fireworks are different colors because they contain different elements. These colors occur when
atoms of various elements react with each other differently
atoms of various elements emit light @ different frequencies
the different elements burn at different temperatures
atoms of differen elements have different numbers of protons
4
Balance the equation: ___ Fe + ___ O2 --> ___ Fe2O3
2, 1, 1
2, 3, 1
1, 2, 3
4, 3, 2
5
Archimedes’ principle states the buoyant force acting on anobject
Decreases if the volume of the object increases
Equals the weight of the fluid displaced by the object
Decreases if the object is placed in a denser liquid
Equals the volume of the fluid displaced by the object
6
What is true of a kilogram of iron and a kilogram of rice?
They occupy the same space
The iron is less dense
The rice is more dense
They have the same mass
7
What is the chemical formula for Al3+ and OH-?
AlOH
Al(OH)3
AlO3H3
any of the above
8
Who published the first atomic theory in 1808?
John Dalton
Ddmocritus
Neils Bohr
Ernest Rutherford
9
Speaking of molecular movement: list the phases in order from fastest to slowest.
Liquid-Solid-Gas
Gas-Liquid-Solid
Gas-Solid-Liquid
Liquid-Gas-Solid
10
NaCl is formed when sodium ____ an electron and chlorine _____ an electron.
shares, shares
gains, loses
loses, shares
loses, gains
11
Atoms with the same number of protons but different atomic mass are called
polyatomic
ions
isotopes
subtypes
12
The building blocks of matter are
protons
atoms and molecules
not yet discovered
electrons
13
Higher viscosity liquids
Is easier to pour than low viscosity ones
Takes longer to pour than low viscosity ones
Have a lower volume than low viscosity ones
Must have a higher density than low viscosity ones
14
Electronegativity of an element is the
amount of static electricity an element produces
attraction an atom has for shared electrons-covalent bonds
amount of charge one atom of an element produces
attraction an atom has for shared electrons-ionic bonds
15
There is one way is to use only two categories for all matter. Which is it?
metals or non-metals
elements or compounds
solids or gases
substances or mixtures
16
When a chemical change occurs,
the law of conservation of mass is always observed
all of the above
the chem properties of the products differ from the reactant
atoms are rearranged
17
Rubber shrinks when it is heated. Warming a rubber bandwould
decrease its density
increase its volume
increase its density
decrease its mass
18
What is the by-product of this combustion reaction? C6H12O6 + 6O2 --> 6CO2 + 6H2O
sugar
energy is released
energy is absorbed
C6H12O6
19
Elements in the same column, group, have similar properties because
they contain similar amounts of energy
atoms want completely full or empty valence shells
they have similar numbers of isotopes
they have the same number of valence electrons
20
A compound:
ALL of these are true
Cannot be separated by physical means
Is classified as a substance
Is made of more than one kind of element
21
An object with a mass of 25 grams occupies 5.0 cm3 of space.Its density is
.20
125
5.0
4.25

1st semester physical science test review Flashcards | StudBud