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