A golf ball has more mass than a tennis ball because it..
answer
contains more matter.
question
A vapor is which state of matter?
answer
gas.
question
Which state of matter has a definite volume and takes the shape of its container?
answer
liquid.
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Which state of matter takes both the shape and volume of its container?
answer
liquid.
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Which state of matter is characterized by having a definite shape and a definite volume?
answer
solid.
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Which of the following is a physical change?
answer
evaporation.
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Which of the following is a heterogeneous mixture?
answer
steel.
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Which of the following is a homogeneous mixture?
answer
salt water.
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Which of the following is true about compounds?
answer
they can be physically separated into their component elements.
question
The first figure in a properly written chemical symbol is always..
answer
capitalized.
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The chemical symbol for iron is..
answer
Fe.
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Which of the following is a chemical property?
answer
ability to react with oxygen.
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In the chemical reaction in which sucrose is heated and decomposes to form carbon dioxide and water, which of the following is a reactant?
answer
water.
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Which of the following is NOT apart of Dalton's atomic theory?
answer
atoms are always in motion.
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Which of the following is true about subatomic particles?
answer
the mass of a neutron nearly equals the mass of a proton.
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All atoms are...
answer
neutral, with the number of protons equaling the number of electrons.
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The nucleus of an atom is..
answer
the central core and is composed of protons and neutrons.
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The atomic number of an element is the total number of which particles in the nucleus?
answer
protons.
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An element has an atomic number of 76. The number of protons and electrons in a neutral atom of the element are...
answer
76 protons and 76 electrons.
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The sum of the protons and neutrons in an atom equals the...
answer
mass number.
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Isotopes of the same element have different...
answer
numbers of neutrons.
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How many protons, electrons, and neutrons does an atom with the atomic number 50 and the mass number 125 contain?
answer
50 protons, 50 electrons, 75 neutrons.
question
If E is the symbol for an element, which 2 of the following symbols represent isotopes of the same element?
answer
E: 20-10 &
E: 21-10
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In which of the following is the number of neutrons correctly represented?
answer
238:92; U has 146 neutrons.
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Which of the following is necessary to calculate the atomic mass of an element?
answer
the atomic number.
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In Bohr's model of the atom, where are the electrons and protons located?
answer
the electrons move around the protons, which are at the center of the atom.
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How does the energy of an electron change when the electron moves closer to the nucleus?
answer
it decreases.
question
How many energy sublevels are in the second principal energy level?
answer
2.
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What is the maximum number of orbitals in the p sublevel?
answer
3.
question
What is the electron configuration of potassium?
answer
1s2, 2s2, 2p6, 3s2, 3p6 ,4s1
question
Stable electron configurations are likely to contain...
answer
filled energy sublevels.
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The quantum mechanical model of the atom...
answer
involves the probability of finding an electron in a certain position.
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What is another name for the representative elements?
answer
group A elements.
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Which of the elements is in the same period as phosphorus?
answer
magnesium.
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Of the elements Pt, V, Li, and Kr, which is a nonmetal?
answer
Kr.
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The atomic number of an element is the total number of which particles in the nucleus?
answer
protons and neutrons.
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Which of the following elements is a transition metal?
answer
copper.
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Which of the following statements is true about ions?
answer
cations form when an atom loses electrons.
question
In which of the following groups of ions are the charges all shown correctly?
answer
Ca2+, Al3+, Br-
question
Which of these elements does not exist as a diatomic molecule?
answer
H
question
Why do atoms share electrons in covalent bonds?
answer
to attain a noble-gas electron configuration.
question
In which of the following compounds is the octet expanded to include 12 electrons?
answer
H2S
question
What type of ions have names ending in -ide?
answer
only anions.
question
When Group 2A elements form ions, they...
answer
lose two electrons.
question
What determines that an element is a metal?
answer
its position in the periodic table.
question
An -ate or -ite at the end of a compound name usually indicates that the compound contains..
answer
a polyatomic anion.
question
Which of the following formulas represents an ionic compound?
answer
N2O4
question
In which of the following is the name and formula given correctly?
answer
sodium oxide, NaO
question
Which of the following shows correctly an ion pair and the ionic compound the two ions form?
answer
Fe3 + O2- ; Fe2O3
question
Select the correct formula for sulfur hexafluoride..
answer
SF6
question
What is the correct name for the compound CoCl2?
answer
cobalt(II)chloride
question
Which of the following is the correct name for N2 O5?
answer
dinitrogen pentoxide
question
In the chemical equation H2O2 (aq) ---> H2O(l)+O2(g), the O2 is a...
answer
product.
question
Which of the following is the correct skeleton equation for the reaction that takes place when solid phosphorus combines with oxygen gas to form diphosphorus pentoxide?
answer
P(s)+O2(g) ---> P2O5(s)
question
What are the coefficients that will balance the skeleton equation below?
answer
3, 1, 2
question
When the following equation is balenced, what is the coefficient for HCl? Mg(s) + Hcl(aq) --> MgCl2 (aq) + H2 (g)
answer
2
question
Chemical equations must be balanced to satisfy...
answer
the law of definite proportions.
question
What are the missing coefficients for the skeleton equation below? Al2 (SO4)3(aq) --->Al(OH)3(aq)+K2 SO4(aq)
answer
1, 6, 2, 3
question
In a combustion reaction, one of the reactants is...
answer
oxygen.
question
In a double-replacement, the..
answer
reactants are two ionic compounds.
question
What are the correct formulas and coefficients for the products of the following double-replacement reaction? Rb Oh + H2 PO4-->
answer
H2 Rb+PO4 OH
question
Which of the following statements is NOT true about double-replacement reactions?
answer
the reactant may be a solid metal.
question
The complete combustion of which of the following substances produces carbon dioxide and water?
answer
CaHCO3
question
The reaction 2Fe + 2Cl2 ---> 2FeCl3 is an example of which type of reaction?
answer
combination reaction.
question
The equation 2C3 H7 OH+ 902 --> 6CO2 + 8H2 O is an example of which type of reaction?
answer
combustion reaction.
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