Group 1 and 2 Elements: Properties, Reactivity, and Compounds

Question 1

How does the atomic radius change as you move down Group 1 and Group 2 elements?

Accepted Answer

Increases due to more energy levels

Answer

Decreases due to increased shielding

Answer

Stays the same

Question 2

Which of the following reactions represents the thermal decomposition of calcium carbonate?

Accepted Answer

CaCO3(s) → CaO(s) + CO2(g)

Answer

CaCO3 → CaO + CO2

Answer

CaCO3 + 2HCl → CaCl2 + H2O + CO2

Answer

CaCO3 + H2SO4 → CaSO4 + H2O + CO2

Question 3

Which of the following elements has the largest atomic radius within Group 1?

Accepted Answer

Rubidium

Answer

Lithium

Answer

Sodium

Answer

Potassium

Question 4

What is the name of the colourless gas produced when a Group 1 element reacts with water?

Accepted Answer

Hydrogen

Answer

Oxygen

Answer

Nitrogen

Answer

Carbon dioxide

Question 5

Which of the following elements is used to produce a green colour in fireworks?

Accepted Answer

Potassium

Answer

Lithium

Answer

Sodium

Answer

Rubidium

Question 6

What is the chemical formula of calcium oxide?

Accepted Answer

CaO

Answer

Ca2O

Answer

CaO2

Answer

Ca(OH)2

Question 7

Which of the following is a balanced chemical equation for the reaction between sodium and hydrochloric acid?

Accepted Answer

2Na + 2HCl → 2NaCl + H2

Answer

Na + HCl → NaCl + H2

Answer

2Na + HCl → 2NaCl + H2

Answer

Na + 2HCl → NaCl2 + H2

Question 8

What is the name of the mineral that is the primary source of calcium?

Accepted Answer

Limestone

Answer

Gypsum

Answer

Fluorite

Answer

Barite

Question 9

Which of the following properties is characteristic of Group 1 elements?

Accepted Answer

Highly reactive and form stable oxides

Answer

Form stable oxides and have a high melting point

Answer

Have a high melting point and exist as diatomic molecules

Answer

Exist as diatomic molecules and are less reactive

Question 10

What is the chemical formula of the ionic compound formed when sodium reacts with chlorine?

Accepted Answer

NaCl

Answer

Na2Cl

Answer

Na2Cl2

Answer

NaCl2

Question 11

What is the trend in atomic radii observed when moving down Group 1?

Accepted Answer

Atomic radii increase

Answer

Atomic radii decrease

Answer

Atomic radii stay the same

Answer

Atomic radii alternate

Question 12

Write the balanced chemical equation for the reaction between calcium oxide and water.

Accepted Answer

CaO + 2H2O → Ca(OH)2

Answer

CaO + H2O → CaOH

Answer

CaO + H2O → CaH + O2

Answer

CaO + 2H2O → CaH2 + O2

Question 13

What is the chemical process by which Group 1 elements lose electrons?

Accepted Answer

Ionization

Answer

Oxidation

Answer

Reduction

Answer

Combustion

Question 14

What is the name of the oxide formed by magnesium?

Accepted Answer

Magnesia

Answer

Magnesite

Answer

Magnesium peroxide

Answer

Magnesium hydroxide

Question 15

Which of the following characteristics describes Group 1 elements?

Accepted Answer

Highly reactive metals

Answer

Form coloured compounds

Answer

Exist as diatomic molecules

Answer

Are good oxidizing agents

Question 16

Which reaction will produce hydrogen gas?

Accepted Answer

Sodium reacting with water

Answer

Calcium reacting with chlorine

Answer

Magnesium reacting with oxygen

Answer

Potassium reacting with nitrogen

Question 17

What is the chemical formula of the ionic compound formed when magnesium reacts with chlorine?

Accepted Answer

MgCl2

Answer

MgCl

Answer

Mg2Cl

Answer

Mg2Cl2

Question 18

Which of the following elements is NOT a reducing agent?

Accepted Answer

Copper

Answer

Sodium

Answer

Calcium

Answer

Barium

Question 19

Which of the following is a balanced chemical equation for the reaction between sodium and chlorine?

Accepted Answer

2Na + Cl2 → 2NaCl

Answer

Na + Cl → NaCl

Answer

Na2 + Cl2 → 2NaCl

Answer

2Na + Cl → NaCl

Question 20

What is the oxidation state of calcium in CaCl2?

Accepted Answer

+2

Answer

0

Answer

+1

Answer

-2

Question 21

Balance the chemical equation and identify the type of bond formed in the product:

Ca + Cl₂ →

Accepted Answer

CaCl₂; Ionic bond

Answer

CaCl; Covalent bond

Answer

Ca₂Cl; Metallic bond

Answer

CaCl₄; Covalent bond

Question 22

Which of the following is a typical property of Group 1 elements?

Accepted Answer

Highly reactive with water

Answer

Form covalent bonds

Answer

Low melting points

Answer

Exist as gases at room temperature

Question 23

Which of the following compounds is NOT formed by a Group 2 element?

Accepted Answer

Sodium chloride

Answer

Calcium oxide

Answer

Magnesium hydroxide

Answer

Strontium sulfate

Question 24

What is the trend in atomic radii down Group 1?

Accepted Answer

Increases

Answer

Decreases

Answer

Remains constant

Answer

Alternates between increasing and decreasing

Question 25

What is the oxidation number of the metal in the compound CaF2?

Accepted Answer

+2

Answer

-2

Answer

-1

Answer

+1

Question 26

What is the solubility of barium sulfate in water?

Accepted Answer

Insoluble

Answer

Very soluble

Answer

Slightly soluble

Answer

Moderately soluble

Question 27

Which of the following is a characteristic of thermal decomposition reactions of Group 2 carbonates?

Accepted Answer

They produce carbon dioxide gas

Answer

They are endothermic

Answer

They require a catalyst

Answer

They only occur at very low temperatures

Question 28

What is the formula of the compound formed when strontium reacts with chlorine?

Accepted Answer

SrCl2

Answer

SrCl

Answer

Sr2Cl

Answer

Sr2Cl2

Question 29

In the reaction between sodium and chlorine, what type of bond is formed?

Accepted Answer

Ionic

Answer

Covalent

Answer

Metallic

Answer

Hydrogen

Question 30

Which of the following is a common oxidation state for Group 2 elements?

Accepted Answer

+2

Answer

+1

Answer

-2

Answer

+4

Question 31

Which of the following statements about the reactivity of Group 1 and Group 2 elements is true?

Accepted Answer

Group 1 elements are more reactive than Group 2 elements

Answer

Group 2 elements are more reactive than Group 1 elements

Answer

Group 1 and Group 2 elements have similar reactivities

Answer

Reactivity decreases down both groups

Question 32

Which of the following properties is characteristic of magnesium?

Accepted Answer

Low density

Answer

High tensile strength

Answer

Good thermal conductivity

Answer

Brittle at room temperature

Question 33

Which of the following is the chemical formula for calcium oxide?

Accepted Answer

CaO

Answer

Ca2O

Answer

CaO3

Answer

Ca3O

Question 34

What is the type of chemical bonding present in sodium chloride (NaCl)?

Accepted Answer

Ionic

Answer

Metallic

Answer

Covalent

Answer

Hydrogen

Question 35

What is the oxidation state of magnesium in magnesium oxide (MgO)?

Accepted Answer

+2

Answer

0

Answer

-1

Answer

+1

Question 36

What is the name of the element with the chemical symbol Mg?

Accepted Answer

Magnesium

Answer

Molybdenum

Answer

Mercury

Answer

Manganese

Question 37

Which of the following describes the reaction that occurs when a Group 1 metal is added to water?

Accepted Answer

Forms a metal hydroxide and releases hydrogen gas

Answer

Forms a metal chloride and releases oxygen

Answer

No reaction occurs

Answer

Forms a metal oxide and releases carbon dioxide

Question 38

What is the term used to describe the gradual change in properties of elements across the periodic table?

Accepted Answer

Periodic trend

Answer

Physical trend

Answer

Chemical trend

Answer

Atomic pattern

Question 39

Which of the following is a defining property of Group 1 elements?

Accepted Answer

Highly reactive metals that readily form +1 ions

Answer

Solid at room temperature

Answer

Dull in appearance

Answer

Poor conductors of electricity

Question 40

Which of the following is NOT a compound formed by Group 2 elements?

Accepted Answer

CaCl3

Answer

MgO

Answer

CaF2

Answer

SrSO4

Question 41

Describe the trend in atomic radius down Group 2:

Accepted Answer

Increases

Answer

Alternates

Answer

Decreases

Answer

Remains constant

Question 42

Which of the following reactions correctly represents the thermal decomposition of calcium carbonate?

Accepted Answer

CaCO3(s) → CaO(s) + CO2(g)

Answer

CaCO3(s) → Ca(s) + CO(g)

Answer

CaCO3(s) + H2O(l) → Ca(OH)2(aq) + CO2(g)

Answer

CaCO3(s) + 2HCl(aq) → CaCl2(aq) + H2O(l) + CO2(g)

Question 43

Name the compound formed when sodium reacts with oxygen:

Accepted Answer

Sodium oxide

Answer

Sodium hydroxide

Answer

Sodium chloride

Answer

Sodium carbonate

Question 44

Which of the following is a significant use of magnesium?

Accepted Answer

Production of lightweight alloys

Answer

Fuel for rockets

Answer

Fertilizer production

Answer

Glass manufacturing

Question 45

Identify the type of chemical bond formed between Group 1 and halogen elements:

Accepted Answer

Ionic bond

Answer

Van der Waals force

Answer

Metallic bond

Answer

Covalent bond

Question 46

Describe the products formed when calcium reacts with water:

Accepted Answer

Calcium hydroxide and hydrogen gas

Answer

Calcium hydroxide and oxygen gas

Answer

Calcium oxide and hydrogen gas

Answer

Calcium carbonate and hydrogen gas