ATI TEAS 7 CHEMISTRY WELL ELABORATED QUESTIONS AND
ANSWERS A GRADE LATEST UPDATE 2024.REVISED
What is a coefficient? - ANSWER- A number placed in front of a symbol or formula in
order to multiply it
What is a Mole? - ANSWER- Unit that is used to measure the amount of a substance
•number of atoms, molecules, or mass of a substance
What are catalysts? - ANSWER- speed up reactions
Endothermic reactions
Exothermic reactions
Endothermic reaction - ANSWER- Reaction that absorbs heat
Example: temperature increases when cooking an egg ( heat is absorbed from the pan
to cook the egg)
Exothermic reactions - ANSWER- Reactions to release heat
Example: The concentration of reactants causing combustion or rain condensation of
water vapor into rain releasing energy in the form of heat
Equilibrium - ANSWER- the rate of the forward reaction is equal to the rate of the
reverse reaction
How does temperature increase reaction rate? - ANSWER- By providing additional
energy to the molecules, speeding them up thus, more collisions with sufficient energy
can occur.
,How does concentration increase reaction rate? - ANSWER- There are more molecules
to collide and react with.
How does surface area increase reaction rate? - ANSWER- There is more space on the
substance to interact with on collisions.
How do catalysts increase the rate of reaction? - ANSWER- by lowering the activation
energy.
Mole - ANSWER- measurement of particles/atoms/molecules.
1 mole is equal to - ANSWER- 6.02 x 10^23 particles.
Avogadro's Number - ANSWER- 6.02 x 10^23.
Molar Mass - ANSWER- weight of 1 mole in a substance. measured in g/mol.
can also be atomic mass.
Molecular Mass - ANSWER- The sum of the masses of all the atoms in a molecule.
Sigfigs must be rounded to what? - ANSWER- The least number of decimals.
The coefficients in a chemical equation represent the... - ANSWER- number of
atoms/molecules AND the number of moles.
Mass, Density, Volume - ANSWER- Density = mass/volume
What is a proton? - ANSWER- Single positive charge
What is a neutron? - ANSWER- subatomic particle with no charge
What is an electron? - ANSWER- negatively charged particle
,proton - ANSWER- particle with a single positive charge
neutron - ANSWER- particle with no electric charge
electron - ANSWER- has a negative charge and is about 2000x smaller than a proton
protons - ANSWER- the types of elements are determined by the number of _____
within the nucleus
isotopes - ANSWER- are atoms of the same element that have different number of
neutrons
isotopes - ANSWER- Carbon-12 and Carbon-14 are _________
atomic mass - ANSWER- the total number of protons and neutrons
atomic number - ANSWER- the number of protons in an atom
the number of protons - ANSWER- how is charge (+/-/neutral) of an atom determined by
negative - ANSWER- if there are more electrons than protons, the atom will have a
______ charge
positive - ANSWER- if there are more protons than electrons, the atom will have a
______ charge
neutral - ANSWER- if the number of protons and electrons are equal, then the atom will
have be _________
, ions - ANSWER- atoms that have gained or lost protons, and as a result, have a charge
either positive or negative
cations - ANSWER- atoms that have lost one or more electrons and have a resulting
positive charge
anions - ANSWER- atoms that have gained one or more electrons and have a resulting
negative charge
anion with a negative charge - ANSWER- What does chlorine (Cl) become when it
gains an electron?
outermost - ANSWER- When an atom gains electrons, it usually happens in the _____
shell.
groups - ANSWER- the columns of the periodic table
periods - ANSWER- the rows of the periodic table
transition elements or metalloids - ANSWER- the few elements that do not fit perfectly
into the periodic table
active metals (alkali and alkaline earth metals) - ANSWER- the first two rows of the
periodic table
reactive metals - ANSWER- the middle of the periodic table (transition elements)
groups - ANSWER- what represents how many valence electrons are in an atom?
protons - ANSWER- the type of element is determined by the number of ______ within
the nucleus.
ANSWERS A GRADE LATEST UPDATE 2024.REVISED
What is a coefficient? - ANSWER- A number placed in front of a symbol or formula in
order to multiply it
What is a Mole? - ANSWER- Unit that is used to measure the amount of a substance
•number of atoms, molecules, or mass of a substance
What are catalysts? - ANSWER- speed up reactions
Endothermic reactions
Exothermic reactions
Endothermic reaction - ANSWER- Reaction that absorbs heat
Example: temperature increases when cooking an egg ( heat is absorbed from the pan
to cook the egg)
Exothermic reactions - ANSWER- Reactions to release heat
Example: The concentration of reactants causing combustion or rain condensation of
water vapor into rain releasing energy in the form of heat
Equilibrium - ANSWER- the rate of the forward reaction is equal to the rate of the
reverse reaction
How does temperature increase reaction rate? - ANSWER- By providing additional
energy to the molecules, speeding them up thus, more collisions with sufficient energy
can occur.
,How does concentration increase reaction rate? - ANSWER- There are more molecules
to collide and react with.
How does surface area increase reaction rate? - ANSWER- There is more space on the
substance to interact with on collisions.
How do catalysts increase the rate of reaction? - ANSWER- by lowering the activation
energy.
Mole - ANSWER- measurement of particles/atoms/molecules.
1 mole is equal to - ANSWER- 6.02 x 10^23 particles.
Avogadro's Number - ANSWER- 6.02 x 10^23.
Molar Mass - ANSWER- weight of 1 mole in a substance. measured in g/mol.
can also be atomic mass.
Molecular Mass - ANSWER- The sum of the masses of all the atoms in a molecule.
Sigfigs must be rounded to what? - ANSWER- The least number of decimals.
The coefficients in a chemical equation represent the... - ANSWER- number of
atoms/molecules AND the number of moles.
Mass, Density, Volume - ANSWER- Density = mass/volume
What is a proton? - ANSWER- Single positive charge
What is a neutron? - ANSWER- subatomic particle with no charge
What is an electron? - ANSWER- negatively charged particle
,proton - ANSWER- particle with a single positive charge
neutron - ANSWER- particle with no electric charge
electron - ANSWER- has a negative charge and is about 2000x smaller than a proton
protons - ANSWER- the types of elements are determined by the number of _____
within the nucleus
isotopes - ANSWER- are atoms of the same element that have different number of
neutrons
isotopes - ANSWER- Carbon-12 and Carbon-14 are _________
atomic mass - ANSWER- the total number of protons and neutrons
atomic number - ANSWER- the number of protons in an atom
the number of protons - ANSWER- how is charge (+/-/neutral) of an atom determined by
negative - ANSWER- if there are more electrons than protons, the atom will have a
______ charge
positive - ANSWER- if there are more protons than electrons, the atom will have a
______ charge
neutral - ANSWER- if the number of protons and electrons are equal, then the atom will
have be _________
, ions - ANSWER- atoms that have gained or lost protons, and as a result, have a charge
either positive or negative
cations - ANSWER- atoms that have lost one or more electrons and have a resulting
positive charge
anions - ANSWER- atoms that have gained one or more electrons and have a resulting
negative charge
anion with a negative charge - ANSWER- What does chlorine (Cl) become when it
gains an electron?
outermost - ANSWER- When an atom gains electrons, it usually happens in the _____
shell.
groups - ANSWER- the columns of the periodic table
periods - ANSWER- the rows of the periodic table
transition elements or metalloids - ANSWER- the few elements that do not fit perfectly
into the periodic table
active metals (alkali and alkaline earth metals) - ANSWER- the first two rows of the
periodic table
reactive metals - ANSWER- the middle of the periodic table (transition elements)
groups - ANSWER- what represents how many valence electrons are in an atom?
protons - ANSWER- the type of element is determined by the number of ______ within
the nucleus.
