Question 1

How many oxygen atoms are there in a molecule of carbon dioxide, CO₂?

Accepted Answer

Two

Answer

One

Answer

Four

Answer

Three

Question 2

Compound is a combination of two or more different elements chemically combined together. Which of the following samples of matter is NOT compound?

Accepted Answer

Ozone (O₃)

Answer

Water (H₂O)

Answer

Glucose (C₆H₁₂O₆)

Answer

Sodium Chloride (Na⁺Cl^-)

Question 3

Salt solution is consist of 25 grams of Sodium Chloride and 75 mL of water. What extensive property of matter uses the unit of twenty five grams (25 g)?

Accepted Answer

a. Mass

Answer

d. Both A and C

Answer

c. Volume

Answer

b. Weight

Question 4

Which statement is true about liquids and gases?

Accepted Answer

They take the shape of the container

Answer

They have definite shape.

Answer

They have definite volume.

Answer

There are no spaces between gas particles

Question 5

Which of the following statements is TRUE for solid particles?

Accepted Answer

The particles are close to each other because of strong attractions between them

Answer

The particles are far apart because of strong attractions between them.

Answer

The particles are far apart because of weak attractions between them

Answer

The particles are close to each other because of weak attractions between them

Question 6

Which of the following BEST describes the particle model and behavior of matter?

Accepted Answer

Particles of matter has spaces between them and are colliding.

Answer

Particles of matter has spaces between them but are not colliding.

Answer

Particles of matter has no space between and not colliding.

Answer

Matter is made up of tiny particles but has no spaces between them.

Question 7

The ice cubes taken out from the freezer melts and turned in to liquid. Which of the following does NOT explains the process?

Accepted Answer

Ice cubes from the freezer has higher temperature than its surrounding temperature.

Answer

Molecules of ice cubes vibrate fast and eventually loosen from fix position and move freely.

Answer

As heat transfer continues the kinetic energy of molecules in ice cubes increases.

Answer

Ice cubes from the freezer has lower temperature than its surrounding.

Question 8

Dew and water vapor are products of what physical change?

Accepted Answer

condensation-evaporation

Answer

evaporation-freezing

Answer

freezing-evaporation

Answer

evaporation-condensation

Question 9

Which of the following changes does NOT involve absorption of heat?

Accepted Answer

Solidification

Answer

Melting

Answer

Evaporation

Answer

Sublimation

Question 10

What phase change is illustrated in the figure on the figure?

Accepted Answer

Melting

Answer

Evaporation

Answer

Freezing

Answer

Condensation

Question 11

What physical changes takes place in number 1?

Accepted Answer

evaporation

Answer

freezing

Answer

melting

Answer

condensation

Question 12

What physical changes takes place in number 2?

Accepted Answer

condensation

Answer

freezing

Answer

melting

Answer

evaporation

Question 13

Which is evidence of chemical change?

Accepted Answer

Appearance of new substance

Answer

Formation of new shape

Answer

Drastic change of size

Answer

Increase of temperature

Question 14

In a chemical reaction _______________ .

Accepted Answer

the atoms of the reactants unbond, rearrange, and then rebond to form the products

Answer

new atoms are formed which combine to make the products

Answer

the atoms of the reactants always stay together to form the products

Answer

some atoms disappear while others multiply to form the products

Question 15

A chemical change is different than a physical change because in a chemical change _______.

Accepted Answer

Anew substance is formed and in a physical change no new substance is formed

Answer

The change can be seen but in a physical change it cannot

Answer

Chemicals are used

Answer

Molecules do not physically touch

Question 16

An atom and a molecule are different but related because ________.

Accepted Answer

A molecule is made up of two or more atoms

Answer

An atom is made up of many different types of molecule

Answer

An atom is smaller than a molecule

Answer

A molecule is the same as an atom

Question 17

How many different types of atoms are in methane (CH₄)?

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 18

How many molecules comprise methane (CH₄)?

Accepted Answer

1

Answer

2

Answer

4

Answer

3

Question 19

Who among the scientists discovered the electron?

Accepted Answer

Joseph John Thomson

Answer

Marie Curie

Answer

Ernest Rutherford

Answer

James Chadwick

Question 20

Through the alpha particles scattering experiment, Rutherford team conceptualized a model of an atom called _____________.

Accepted Answer

Nuclear model

Answer

Plum Pudding model

Answer

Electron cloud model

Answer

Planetary model

Question 21

It is the most accepted model of the scientists today known as Schrodinger and Heisenberg Model

Accepted Answer

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Answer

https://uploads.quizalize.com/a565da66-174c-48f2-9feb-2bd2e4d386e2/question/bad96a9ba23656a4d0458ad4c92f83b00ec0ed38.png

Answer

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Answer

https://uploads.quizalize.com/a565da66-174c-48f2-9feb-2bd2e4d386e2/question/2406f872adf1f2b7d7c42493a6b32adbd7a409ed.png

Question 22

The symbol

Accepted Answer

the mass number

Answer

the number of neutron

Answer

the atomic number

Answer

the isotope number

Question 23

How is positive ion formed?

Accepted Answer

When electrons are removed from one atom and the number of electrons becomes less than the number of protons

Answer

When electrons are removed from one atom and the number of electrons becomes more than the number of protons

Answer

When protons are added to the atom.

Answer

When electrons are removed from one atom and the number of electrons becomes equal to the number of protons.

Question 24

How many protons and electrons

Accepted Answer

34 protons, 36 (34 +2) electrons

Answer

34 protons, 2 electrons

Answer

34 protons, 32 (34-2) electrons

Answer

78 protons, 34 electrons

Question 25

Arrange the following elements according to decreasing atomic radius.

Accepted Answer

IV, III, II, I

Answer

III, II, I, IV

Answer

IV, II, III, I

Answer

IV, I, III, II

Question 26

In general, ionization energy ________as you go down and _______ as you go across(left to right) the periodic table.

Accepted Answer

decreases, increases

Answer

decreases, decreases

Answer

increases, increases

Answer

increases, decreases

Question 27

If metallic character of elements increases from top to bottom of the periodic table, which of the following elements is the most metallic?

Accepted Answer

Rg

Answer

Cu

Answer

Ni

Answer

Ag

Question 28

Calcium’s electron configuration is 1s² 2s²2p⁶ 3s² 3p⁶ 4s². Therefore, it has _______ energy shells and it belongs to group number_____.

Accepted Answer

4 ,2

Answer

4 , 4

Answer

2 , 2

Answer

2 , 4

Question 29

Which of the following shows the electron configuration for C-6 (Carbon)?

Accepted Answer

1s² 2s² 2p²

Answer

1s2

Answer

1s² 2s²2p⁶ 3s²

Answer

1s2 2s2

Question 30

In which group does C belong?

Accepted Answer

Group14

Answer

Group 12

Answer

Group 13

Answer

Group 11

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