CHEMISTRY
問題一覧
1
Is the calculation of reactants and products in chemical reactions.
a. Stoichiometry
b. atomic mass
c. mole concept
a
2
It is used as the bridge between chemistry on the atomic and macroscopic scale.
a.stoichometry
b. Avogadro's no.
c. atomic mass
c
3
The concept of the mole can be used to convert between mass and number of particles.
a. Avogadro's no.
b. mole concept
c. atomic mass
a
4
The amount of substance is measured in units of moles.
a. Avogadro's no.
b. mole concept
c. atomic mass
b
5
The simplest form of expressing the elemental composition of a compound.
a. Empirical Formula
b. molecular formula
a
6
Derived first from the weight percentages of the elements present in the compound.
a. Empirical Formula
b. molecular formula
a
7
Contains the most simplified ratio of the moles of elements in the compound.
a. Empirical Formula
b. molecular formula
a
8
The actual representation of the elemental composition of the compound.
a. Empirical Formula
b. molecular formula
b
9
Related to the total weight of the compound in question and often derived after obtaining the empirical formula.
a. Empirical Formula
b. molecular formula
b
10
Not often used in reaction schemes.
a. Empirical Formula
b. molecular formula
a
11
A principle stated in 1811 by the Italian chemist ____________(1776-1856)
a. Angelo Avogadro
b. Amadeo Avogadro
c. Amando Avogadro
b
12
In a chemical reaction ______ is converted to one or more new _________.
a. Compound/s
b. Atom/s
c. Substance/s
d. Element/s
c
13
What law do chemical reactions follow?
a. Law of Definite Proportions
b. Law of Multiple Proportions
c. Law of Constant Composition
d. Law of Conservation of Mass
d
14
In chemical reactions, no ________ is created or destroyed.
a. Atom
b. Molecule
c. Matter
d. Compound
a
15
In a chemical equation, what term is used to call the starting substances?
a. Products
b. Reactants
c. Elements
d. Compounds
b
16
In a chemical equation, what term is used to call the substances placed on the right side?
a. Products
b. Reactants
c. End products
d. Resultants
a
17
This symbol is used to tell the direction of the chemical reaction.
a. Arrow
b. Chemical Arrow
c. Reaction Arrow
d. Forward Arrow
c
18
To balance a Chemical Equation, _______ are used.
a. Subscripts
b. Coefficients
c. Grams
d. Moles
b
19
What term is used to determine whether a substance is a solid, liquid, or gas in a chemical equation?
a. States of Matter
b. Physical states
c. Chemical states
d. Phase of Matter
b
20
When a substance is dissolved in water, we indicate this with “aq” meaning it is in an?
a. Aquatic Environment
b. Aquatic Solution
c. Aqueous Solution
d. Aqueous Environment
d
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1
Is the calculation of reactants and products in chemical reactions.
a. Stoichiometry
b. atomic mass
c. mole concept
a
2
It is used as the bridge between chemistry on the atomic and macroscopic scale.
a.stoichometry
b. Avogadro's no.
c. atomic mass
c
3
The concept of the mole can be used to convert between mass and number of particles.
a. Avogadro's no.
b. mole concept
c. atomic mass
a
4
The amount of substance is measured in units of moles.
a. Avogadro's no.
b. mole concept
c. atomic mass
b
5
The simplest form of expressing the elemental composition of a compound.
a. Empirical Formula
b. molecular formula
a
6
Derived first from the weight percentages of the elements present in the compound.
a. Empirical Formula
b. molecular formula
a
7
Contains the most simplified ratio of the moles of elements in the compound.
a. Empirical Formula
b. molecular formula
a
8
The actual representation of the elemental composition of the compound.
a. Empirical Formula
b. molecular formula
b
9
Related to the total weight of the compound in question and often derived after obtaining the empirical formula.
a. Empirical Formula
b. molecular formula
b
10
Not often used in reaction schemes.
a. Empirical Formula
b. molecular formula
a
11
A principle stated in 1811 by the Italian chemist ____________(1776-1856)
a. Angelo Avogadro
b. Amadeo Avogadro
c. Amando Avogadro
b
12
In a chemical reaction ______ is converted to one or more new _________.
a. Compound/s
b. Atom/s
c. Substance/s
d. Element/s
c
13
What law do chemical reactions follow?
a. Law of Definite Proportions
b. Law of Multiple Proportions
c. Law of Constant Composition
d. Law of Conservation of Mass
d
14
In chemical reactions, no ________ is created or destroyed.
a. Atom
b. Molecule
c. Matter
d. Compound
a
15
In a chemical equation, what term is used to call the starting substances?
a. Products
b. Reactants
c. Elements
d. Compounds
b
16
In a chemical equation, what term is used to call the substances placed on the right side?
a. Products
b. Reactants
c. End products
d. Resultants
a
17
This symbol is used to tell the direction of the chemical reaction.
a. Arrow
b. Chemical Arrow
c. Reaction Arrow
d. Forward Arrow
c
18
To balance a Chemical Equation, _______ are used.
a. Subscripts
b. Coefficients
c. Grams
d. Moles
b
19
What term is used to determine whether a substance is a solid, liquid, or gas in a chemical equation?
a. States of Matter
b. Physical states
c. Chemical states
d. Phase of Matter
b
20
When a substance is dissolved in water, we indicate this with “aq” meaning it is in an?
a. Aquatic Environment
b. Aquatic Solution
c. Aqueous Solution
d. Aqueous Environment
d