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Which compound had double bonds within its molecular structure?
CO2
According to the law of conservation of mass, the total mass of the reacting substance is
Always equal to the total mass of the product
The equation below that does not violate the law of conservation of mass is
2Fe2O3 + 3C ➡4Fe + 3 CO2
Copper is one of a group of metals called the coinage metals. How many atoms of Copper (Cu) are in a pure copper coin weighing 12.0 g?
1.13 × 10²³ atoms
The electron configurations of main-group elements end in
S and P orbitals
To solve a mass-mass stoichiometry problem, you must know the …
Coefficients of the balanced equation
Sulfur (S) needs two more electrons to fill its outermost energy level. What is the number of electrons that S has in its outermost energy level before it forms a bond?
6
Solid aluminum and gaseous oxygen react in a combination reaction to produce aluminum oxide: 4 Al + 3 O2 ➡ 2 Al2 O3
In a particular experiment, the reaction of 2.5g of Al with 2.5 of O2 produced 3.5 g of Al2 O3. The % yield of the reaction is
74
The reaction Mg + 2HCl ➡ H2 + MgCl2 is a
Single displacement
An element with the electron configuration 1s²2s²2p^6 will be ionized to an
Anion
4Fe + ? O2 ➡ 2Fe2O3
How many oxygen (O2) molecules are needed to balance the chemical equation shown above
3
The shape of a molecule that has two covalent single bonds and no lone pairs on the central atom is …
Linear
The reaction 2C2H + 5O2 ➡ 4CO2 + 2H2O is a
Combustion reaction
The energy it takes to remove an electron from an atom ____ as you move left to right across the period, from magnesium to chloride
Generally increases
Identify the period and group of the element that has the electron configuration [NE]3s²3p³
Period 3, group 5A
Unequal sharing of electrons between two bonded atoms always indicates
A polar covalent bond
Which elements on the periodic table are most likely to form two or more ions with different charge?
Transitional metals
Which of the following molecules have a covalent bonding ?
CH4
Which element has the largest number of unpaired electrons
N
What is the Maximum mass in grams of NH3 that can be produce by the reaction of 1.0g of N3 with 3.0g of H2 via the equation below
N2 + H2 ➡ NH3
1.2
The combustion of ammonia in the presence of excess oxygen yields NO2 and H2O
4NH3 + 7 O2 ➡ 4 NO2 + 6 H2O
The combustion of 43.9g of ammonia produces ____g of NO2
119
The reaction of Mg + 2HCL ➡ H2 + MgCl2 is a
Single displacement
What defines a mole?
The Number of atoms in 12 g of carbon 12
The correct Lewis Dot structure for SO2 is
O-S=O
Calculate the number of molecules in 4.0 mol H2O
2.4 × 10^ 24 molecules
Ionic bonds generally occur between ___.
A mental and a nonmetal
What type of ions are present in solution but are not actually involved in a chemical reaction?
Spectator
Which of the following molecules have an ionic bond?
NaI
Stoichiometry is the branch of chemistry that deals with the ____ between elements and compounds, reactant and products in a chemical reaction
Numerical relationship
Which of the following elements has the greatest atomic radius?
Al
Which of the following equations represents a decomposition reaction
HgO ➡ Hg + O2
Actual yield is affected by
All of the above
Copper (Cu) is a transition element used in the making of coins. Calculate the mass in grams of 0.0420 moles of copper
2.67 g
What is the mass of potassium chloride when 2.50g of potassium reacts with excess of chlorine gas?
4.77g
When the following equation is balanced, the coefficients are
Al(No3)3 + Na2S ➡ Al2S3 + NaNO3
2, 3, 1, 6
When the following equation is balanced, the coefficients are
NH3 + O2 ➡ NO2 + H2O
4, 7, 4, 6
The shape of a molecule that has three single covalent bonds and one lone pair in the central atom is ___.
Trigonal pyramidal
Which of the following situations will cause the element with the electron configuration 1s²2s² 2p^6 3s² to have an octet configuration
Loss of two electrons
Elements in the same group have similar chemical properties because
They have the same number of valence elections
The law of conservation of mass states that during a chemical reaction, total mass is ___
The same
The Lewis structure of methane, CH4, has
Four single bonds
The symbol ♾^+ is placed next to which of the following
The less electronegative atom in a polar covalent bond
What is the theoretical yield of the below equation if 8.0 mol As2 O3 is reacted with excess carbon
2As2O3 + 3C ➡ 3CO2 + 4As
16 mol As
How many moles of Calcium are in 425g calcium (Ca)?
10.6 mol
Which of the following compounds does not contain a polyatomic ion?
Sodium sulfide
In the formation of a covalent bond, electrons are ___.
Shared
The name for the N2O3 is
Dinitrogen trioxide
A non polar covalent bond is one in which ___.
Electrons are shared equally
Which of the following elements behaves similar to calcium?
Magnesium
The correct name for NH4C2H3O2 is
Ammonium acetate
When the difference in electronegativity between two atoms is large, the atom can bond by transferring electron. Which type of bonding occurs when this happens?
Ionic
In the reaction Zn + H2SO4 ➡ ZnSO4 + H2, what element did the displacing?
Zn
When the following equation is balanced, the coefficient of AlCl3 is
Al2O3 + C + Cl2 ➡ AlCl3 + CO
2
Table salt crystals consist of a pattern of altering sodium ions and chloride ions. When salt is added to water the electrical conductivity of the water increases. Which explanation best describes this observation.
Salt separates into positive and negative ions in water
Which of the following compounds is an exception on the octet rule?
BH3
Which of the following bondings are listed in increasing order
Non-polar covalent, polar covalent, ionic
The overall charge of a formula unit for an ionic compound ___.
Is always zero
Methane (CH4) is a common hydrocarbon that is found when 1 carbon atoms bonds to 4 hydrogen atoms. Which diagram is the correct Lewis dot structure for methane?
H
|
H-C-H
|
H
In the chemical reaction described by the equation
4Fe + 3O2 ➡ 2Fe2O3
The mole ration of iron (III) oxide to iron is
1:2
Calcium carbide (CaC2) reacts with water to produce acetylene (C2H2):
CaC2 +2H2O ➡ Ca(OH)2 + C2H2
Production of 13g of C2H2 requires consumption of ____g of H2O
18
Which diagram best represents the group and period trends in atomic radii in the periodic table?
Generally decreases ➡
Generally increases ⬇
Which element typically bonds with other elements by receiving only 1 electron per atom?
Br
The formula weight of ammonia Sulfate is [(NH4)2 SO4] ____amu
132
For the reaction below, how many moles of N2 are required to produce 18 mol NH3
9
What is the balanced equation for the synthesis of sulfur dioxide
S8 +8O2 ➡ 8SO2
How many valence electrons does a chlorine atom have if its electron configuration is [Ne]3s²3p^5
7
In a chemical equation, the symbol (aq) indicates that the substance is
Dissolved in water
If a chemist calculated the maximum amount of product that might be obtained in a chemical reaction, he or she is calculating the
Theoretical yield
The reaction PB(NO3)2 + KI ➡ PbI2 + KNO3 is a
Double displacement reaction
When the electronegativities of two bonded atoms differ greatly, the bond is __.
Polar covalent
Four electrons are shared in a ___.
Double covalent bond
Because ammonia, NH3, had an unshared pair of electrons, its molecular shape is
Trigonal pyramidal
When the following equation is balanced, the coefficients are C2H6 + O2 ➡ CO2 + H2O
4, 7, 4, 6
The total number of the valence electrons in a nitrate ion, NO3-
24
Carbon (C) and hydrogen have electronegativites that are similar. Which type of bonding occurs between atoms in methane (CH4)
Covalent
The shape of a molecule whose central atom has four pairs of bonding electrons is ___.
Tetrahedral
What type of reaction is represented by this general equation?
F2 + MgCl2 ➡ Cl2 + MgF2
Single displacement
Which of the following is a correct Lewis Dot Structure
Cl
|
Cl-C-Cl
|
Cl
The unbalanced chemical equation for the reaction is which carbon monoxide burns in oxygen to form carbon dioxide is
CO + O2 ➡ CO2
Which of the following are decomposition reactions?
1. MgO → Mg + O2
2. CH4 + O2 → CO2 + H2O
3. PbO + СО2 → РbCO3
4. CaCO3 → CaO + CO2
1 & 4
2Na + ? H2O ➡ 2NaOH + H2
Which coefficient for H2O will balance the equation above?
2
What type of reaction is represented by this general equation?
A + BC ➡ AC + B
Single displacement
Predict the product in the combination reaction below
Al + O2 ➡ _____
Al2O3
Which of the following situations will cause the element with the electron configuration 1s²2s²2p^5 to have octet configuration?
Gain of one electron
The actual yield of a product is ____.
Measured experimentally
The correct formula for ammonium phosphate is
(NH4)3 PO4
Salts are examples of
Ionic compounds
In a chemical reaction, the reactant remaining after all of the limiting reactant is completely used up is referred to as the
Excess reactant
The VSEPR model is based on the idea that __.
shared and unshared electron pairs repel each other as much as possible.
Predict the product in the combination reaction below
Al + N2 ➡ ___.
AlN
Which of the following is the correct formula for iron (III) sulfate
Fe2(SO4)3
Limiting a reactant is often accomplished by ___.
Using an excess of another reactant
The number of unpaired electrons in H2O is
4
Which of the following is an incorrect Lewis dot structure?
H-N-H
-
Note
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