Practice Questions 1

Question 1

Which is NOT true?
Isotopes of same element have the same # of protons
Isotopes of same element have the same # of electrons
Isotopes of same element exhibit the same physical properties
Isotopes of same element exhibit same chemical properties

Answer 1

Isotopes of same element exhibit the same physical properties

Question 2

Which type of chemical bond is present in molecules such as MgO and NaH2?
Hydrogen bond
Covalent bond
Polar covalent bond

Isotopes of same element exhibit the same physical properties

Answer 2

Isotopes of same element exhibit the same physical properties

Question 3

A carbon atom can become stable only by:
Losing 4 valence electrons to form ionic bonds & acquire a stable duplex
Gaining 4 electrons to form ionic bonds and acquire a stable octet
Sharing 4 electrons with atoms of other elements
Losing 4 electrons to any free radical

Answer 3

Sharing 4 electrons with atoms of other elements

Question 4

In the reaction N2 + 3H2 <=> 2NH3 the total number of bonds in the product is
Equal to the number of bonds in the reactants
One less than the number of bonds in the reactants
One greater than the number of bonds in the reactants
Two less than the number of bonds in the reactants

Answer 4

Equal to the number of bonds in the reactants

Question 5

Within the periodic table, the tendency of the elements to gain electrons:
Decreases from left to right in a period
Increases for left to right in a period
Decreases from top to bottom in all groups
Increases from top to bottom in all groups

Answer 5

Increases for left to right in a period

Question 6

When moving down a group of the periodic table, the ionization energy of each successive element normally/
Increases
Decreases
Remains the same
Increases and then decreases

Answer 6

Decreases

Question 7

Short answers: draw Lewis structures and structural formula for NH3

Question 8

Short answers: draw Lewis structures and structural formula for H2CO

Question 9

Short answers: draw Lewis structures and structural formula for HCN

Question 10

Write the chemical formula for Ammonium Chloride

Answer 10

NH4Cl

Question 11

Write the chemical formula for Calcium carbonate

Answer 11

CaCO3

Question 12

Write the chemical formula for Potassium cyanide

Answer 12

KCN

Question 13

Predict the reaction products and write a balanced statement
Zn + CuSO4 ->

Answer 13

Zn + CuSO4 -> ZnSO4 + Cu

Question 14

Predict the reaction products and write a balanced statement
Ba(NO3)2 + Na2SO4 ->

Answer 14

BaSO4 + 2NaNO3

Question 15

Predict the reaction products and write a balanced statement
2NO ->

Answer 15

N2 + O2

Question 16

Pure iron can be produced by a reaction between iron (III) oxide and aluminum. Write a balanced equation for this reaction.
What type of reaction is this?

Answer 16

Fe2O3 + 2Al -> Al2O3 + 2Fe
Single displacement