test

Question 1

What is the general trend of reactivity among metals in the periodic table?

Answer 1

Reactivity increases as you move down a group and decreases as you move across a period from left to right.

Question 2

True or False: Alkali metals are more reactive than transition metals.

Answer 2

True

Question 3

Fill in the blank: The most reactive metal is __________.

Answer 3

Francium

Question 4

Which of the following metals is least reactive? A) Potassium B) Gold C) Sodium

Answer 4

B) Gold

Question 5

What reaction occurs when metals react with oxygen?

Answer 5

Metals form oxides when they react with oxygen.

Question 6

What is the definition of displacement in physics?

Answer 6

Displacement is the vector quantity that refers to the change in position of an object, measured from its initial position to its final position.

Question 7

True or False: Displacement can be negative.

Answer 7

True

Question 8

Fill in the blank: Displacement is different from distance because it takes into account the _____ of the path taken.

Answer 8

direction

Question 9

Which of the following best describes displacement? A) Total path length, B) Straight line from start to finish, C) Average speed.

Answer 9

B) Straight line from start to finish

Question 10

What is the formula for calculating displacement when given initial and final positions?

Answer 10

Displacement = Final position - Initial position

Question 11

What is a giant covalent bond?

Answer 11

A giant covalent bond is a type of chemical bond where atoms are connected by covalent bonds in a large network structure.

Question 12

True or False: Giant covalent structures have a fixed number of atoms.

Answer 12

False: Giant covalent structures can have an indefinite number of atoms, forming a continuous network.

Question 13

Fill in the blank: Giant covalent bonds are typically found in materials such as ______ and ______.

Answer 13

diamond; silicon dioxide

Question 14

Which of the following is a characteristic of giant covalent structures? A) High melting point B) Low electrical conductivity C) Soluble in water

Answer 14

A) High melting point

Question 15

What type of lattice structure do giant covalent bonds often form?

Answer 15

They often form a three-dimensional lattice structure.

Question 16

What type of bonding occurs in simple covalent structures?

Answer 16

Covalent bonding

Question 17

True or False: Simple covalent structures typically have high melting and boiling points.

Answer 17

False

Question 18

Fill in the blank: Simple covalent structures are generally ______ in water.

Answer 18

insoluble

Question 19

Which of the following is a property of simple covalent substances? A) Conduct electricity B) Have low melting points C) Are hard and brittle

Answer 19

B) Have low melting points

Question 20

What is the typical state of simple covalent substances at room temperature?

Answer 20

Gas or liquid

Question 21

What are ionic substances primarily composed of?

Answer 21

Ionic substances are primarily composed of positive and negative ions.

Question 22

True or False: Ionic compounds typically have high melting and boiling points.

Answer 22

True

Question 23

Fill in the blank: Ionic substances conduct electricity when ______.

Answer 23

dissolved in water or melted

Question 24

Which of the following properties is NOT characteristic of ionic substances? A) Brittle B) Malleable C) High melting point D) Soluble in water

Answer 24

B) Malleable

Question 25

Explain the reason why ionic compounds are generally soluble in water.

Answer 25

Ionic compounds are generally soluble in water due to the attraction between the ions and the polar water molecules.

Question 26

What is the primary characteristic of metallic structures that allows them to conduct electricity?

Answer 26

The presence of free-moving electrons.

Question 27

True or False: Metallic structures are generally brittle and break easily under stress.

Answer 27

False.

Question 28

Fill in the blank: The ability of a metal to be drawn into wires is known as __________.

Answer 28

ductility.

Question 29

Which property of metals allows them to be hammered or pressed into shapes without breaking?

Answer 29

Malleability.

Question 30

What is the term used to describe the shiny appearance of metallic surfaces?

Answer 30

Luster.