Question 1

Which statement is INCORRECT?

Accepted Answer

An electron can emit energy when it jumps to a higher energy level.

Answer

An electron can absorb energy when it jumps to a higher energy level.

Answer

Filling of electrons in an atom start from lower energy level to highest energy level.

Answer

Orbital is a region in an atom where an electron can be found.

Question 2

Which quantum number(s) do 2s and 2p orbitals have in common?

Accepted Answer

n

Answer

n and l

Answer

l and ml

Answer

l

Question 3

The element with electron configuration 1s2 2s2 2p6 3s2 3p2 is _______________.

Accepted Answer

Si (Z =14)

Answer

Mg (Z =12)

Answer

S (Z =16)

Answer

C (Z =6)

Question 4

The possible values of an electron's spin quantum number are

Accepted Answer

+1 /2 or− 1 /2

Answer

0 or 1

Answer

–1, 0, or 1

Answer

+1 or –1

Question 5

Which orbital shows a violation of Hund's Rules?

Accepted Answer

https://uploads.quizalize.com/646cc4f7-826d-4b3b-ba1a-6ba2c6321591/question/52398b033bdad88e4d7a27c7b87e8c9be5d9a836.PNG

Answer

https://uploads.quizalize.com/646cc4f7-826d-4b3b-ba1a-6ba2c6321591/question/5cccbc491dfbc04d520ebc0f2e090453fa06aa28.PNG

Answer

https://uploads.quizalize.com/646cc4f7-826d-4b3b-ba1a-6ba2c6321591/question/81499ac906c4d672a030a8753b6fa76c91db5667.PNG

Answer

https://uploads.quizalize.com/646cc4f7-826d-4b3b-ba1a-6ba2c6321591/question/1256808e997b44a9c98f1b8f1936b1412270baa7.PNG

Question 6

If n is the principal quantum number of a main energy level, the number of electrons in that energy level is _________.

Accepted Answer

2n2

Answer

n

Answer

n2

Answer

2n

Question 7

A vertical column in the periodic table is called a:

Accepted Answer

group

Answer

period

Answer

branch

Answer

valence

Question 8

Which model shows the possibility of an electron to be discovered in several locations around the nucleus?

Accepted Answer

Quantum Mechanical Model

Answer

Dalton’s Atomic Model

Answer

Bohr’s Model

Answer

Uncertainty Principle

Question 9

Electrical and thermal conductivity is one of the properties of compounds. Which of the following types of bond will have a high electrical conductivity?

Accepted Answer

ionic bond

Answer

non-polar covalent bond

Answer

polar covalent bond

Answer

covalent bond

Question 10

In covalent bonding, electrons are shared between atoms or elements to attain stability. What do you call the particle/substance produced with covalent bond?

Accepted Answer

molecule

Answer

atom

Answer

compound

Answer

none of the choices

Question 11

Which of the following physical properties is TRUE to an ionic compound?

Accepted Answer

high melting point

Answer

low boiling point

Answer

poor conductor

Answer

low melting point

Question 12

The following compounds are commonly found in nature or in our household. Which of the following will have the highest melting temperature?

Accepted Answer

sodium chloride (NaCl)

Answer

sucrose (sugar)

Answer

dihydrogen monoxide (water)

Answer

oxygen gas

Question 13

Non-polar covalent bonding involves the equal sharing of electrons between atoms to attain stability. Which of the following compounds has a non-polar covalent bond?

Accepted Answer

O2

Answer

HCl

Answer

CH4

Answer

NaCl

Question 14

Which is TRUE to a compound with polar covalent bond?

Accepted Answer

electron is shared unequally

Answer

electron is removed in an atom

Answer

electron is shared equally

Answer

electron is transferred

Question 15

What happens to the electron of a metal element in ionic bonding forming a compound?

Accepted Answer

transferred to non-metal

Answer

shared unequally with non-metal

Answer

shared to a non-metal

Answer

none of the choices

Question 16

Which of the following statements is INCORRECT about cation?

Accepted Answer

There is a decrease in the number of neutrons.

Answer

There is a decrease in the number of electrons.

Answer

The number of protons and electrons in the atom is unequal.

Answer

The charge of the ion will be positive.

Question 17

What ion can be combined with nitrogen ions to form an ionic compound?

Accepted Answer

Calcium ion

Answer

Carbon ion

Answer

Fluorine ion

Answer

Chlorine ion

Question 18

Which of the following chemical formulas is correct?

Accepted Answer

Al₂S₃

Answer

Al₃S₂

Answer

AlS2

Answer

Al3S

Question 19

Which of the following symbols is INCORRECT?

Accepted Answer

https://uploads.quizalize.com/646cc4f7-826d-4b3b-ba1a-6ba2c6321591/question/f00321988d85cab12a01030c82ac4c52a3018f4f.PNG

Answer

https://uploads.quizalize.com/646cc4f7-826d-4b3b-ba1a-6ba2c6321591/question/5490178151a997fc42f227cf5ab5d4ae2795dd3c.PNG

Answer

https://uploads.quizalize.com/646cc4f7-826d-4b3b-ba1a-6ba2c6321591/question/f50c794707a420d9f2d0e532f51ad822e1340564.PNG

Answer

https://uploads.quizalize.com/646cc4f7-826d-4b3b-ba1a-6ba2c6321591/question/b8317cdd0e07ac9f7e975bfac00c83a3aad9a0ec.PNG

Question 20

Chlorine and fluorine have 7 valence electrons. Which of the following families do these two elements belong to?

Accepted Answer

Halogens

Answer

Pnictogens

Answer

Alkali Metals

Answer

Chalcogens

Question 21

Which of the following ions is classified as a monatomic ion?

Accepted Answer

Co²⁺

Answer

CN–

Answer

NH₄⁺

Answer

Cr₂O₇^2–

Question 22

Iron (II) Sulfate is used to treat iron deficiency. What is the cation in the compound?

Accepted Answer

Fe²⁺

Answer

S2-

Answer

SO₄^2–

Answer

Fe+

Question 23

Which best describes organic compounds?

Accepted Answer

There is a Carbon atom together with a Hydrogen or an Oxygen atom.

Answer

There is a combination of Carbon atoms, a metal, and a non-metal atom.

Answer

There is no Carbon atom in the compound.

Answer

There is a Carbon atom but does not have a Hydrogen or an Oxygen atom.

Question 24

As you pour the engine oil in the machine, you notice that the flow is somewhat thick and sticky as compared to water. Which property best describes this scenario?

Accepted Answer

Engine oil has high viscosity

Answer

Engine oil has low volatility

Answer

Engine oil has high volatility

Answer

Engine oil has low viscosity

Question 25

Which of the following compounds is classified as organic compounds?

I. C₃H₈ II. CBr₄ III. CO₂ III. CaCO₃

Accepted Answer

I only

Answer

II and IV

Answer

III only

Answer

I, II, and III

Question 26

What do you think is the reason why Carbon is called a tetravalent atom?

Accepted Answer

Carbon has four valence electrons.

Answer

Carbon can also share two or three electrons, forming a double bond or triple bonds.

Answer

Carbon can make long chains.

Answer

Carbon can form branched chains or a cyclic ring.

Question 27

Which of the following statements is TRUE about the property of Organic compounds?

Accepted Answer

Organic compounds made up of long molecules are expected to have high viscosity.

Answer

Organic compounds made up of long molecules are expected to have low volatility.

Answer

Most organic compounds are flammable because they are made up of Carbon atoms only.

Answer

All organic compounds have the same odor.

Question 28

What do you think is the reason why smoking is not allowed in the vicinity of a gasoline station?

Accepted Answer

Gasoline is flammable and cigarette smoking can be the source of fire.

Answer

Cigarette smoking is bad for our health.

Answer

Cigarettes are poisonous when they are exposed to gasoline vapors.

Answer

It is in the city ordinance.

Question 29

Which of the following sets of Organic Compounds is flammable?

I. Acetone II. Kerosene III. Olive oil IV. Vinegar

Accepted Answer

I and II

Answer

III and IV

Answer

II and III

Answer

I, II, and III

Question 30

The following are formulas of organic compounds, which of the following is/are expanded structural formula/s?

Accepted Answer

III and IV

Answer

II only

Answer

I only

Answer

I and II

Question 31

Ethyne is a gas that is used in welding torches. Which of the following is the correct molecular formula of this compound?

Accepted Answer

C₂H₂

Answer

C₃H₆

Answer

C₂H₆

Answer

C₂H₄

Question 32

Refer to the structure below. Which group of hydrocarbons does the molecule belong to?

Accepted Answer

alkane

Answer

benzene

Answer

alkene

Answer

alkyne

Question 33

Below are examples of hydrocarbons, which of the following is/are saturated?

I. ethene II. ethyne III. propane IV. pentene

Accepted Answer

III only

Answer

I, II, and IV

Answer

I only

Answer

II only

Question 34

Why does the boiling point of hydrocarbons increase as the number of carbon atoms increases?

Accepted Answer

The attractions become stronger as the molecules lengthen in hydrocarbons.

Answer

Hydrocarbons are flammable.

Answer

Hydrocarbons are organic compounds.

Answer

There are carbon to carbon bonds linked to hydrogen atoms in hydrocarbons.

Question 35

Given the examples of substituted hydrocarbons, which of the following organic compounds can be used as an artificial flavoring?

Accepted Answer

ethyl ethanoate

Answer

amino acid

Answer

formaldehyde

Answer

diethyl ether

Question 36

Two organic compounds, ethyl butanoate and formaldehyde were placed in separate unlabeled beakers, what property can you observe on the two compounds?

I. Ethyl butanoate has a sweet smell

II. Formaldehyde has a pungent smell.

III. Both organic compounds have a sweet smell.

IV. Both organic compounds have a pungent smell.

Accepted Answer

I and II

Answer

I only

Answer

III and IV

Answer

II only

Question 37

Which of the following compounds is represented by a molecular unit?

I. table salt (NaCl)

II. table sugar (C₁₂H₂₂O₁₁)

III. water (H₂O)

Accepted Answer

II and III

Answer

I only

Answer

II only

Answer

I and II

Question 38

One of the severe complications of Covid-19 is pneumonia. Pneumonia is an inflammation of the air sacs in the lungs due to viral or bacterial infection. Some doctors may prescribe Azithromycin (C₃₈H₇₂N₂O₁₂). What is the molecular mass of this compound?

Accepted Answer

748 g

Answer

74.9 g

Answer

149 g

Answer

949 g

Question 39

How can the knowledge of mole be useful for environmentalists?

Accepted Answer

It gives information on the most dangerous pollutant in the atmosphere.

Answer

Mole concept can be used in measuring the amounts of pollutant-particles released in the atmosphere.

Answer

Mole concept can be used in environmental monitoring.

Answer

It gives feedback on the kinds of pollutants present in the atmosphere.

Question 40

Penicillin was the first natural antibiotic used to treat bacterial infections and continues to be one of the most important antibiotics. What is the molar mass of its form Penicillin G (C₁₆H₁₈N₂O₄S)?

Accepted Answer

334 g/mol

Answer

443 g/mol

Answer

443 g/mol

Answer

434 g/mol

Question 41

Which of the following molecules is equivalent to 1 mole?

I. 34 g NH₃ II. 42 g N₂ III. 44 g CO₂ IV. 70 g Cl₂

Accepted Answer

III and IV

Answer

II only

Answer

I only

Answer

I and II

Question 42

If you drink 3000.00 g of water in a day, how many molecules of water are added to your body?

Accepted Answer

1.00 x 10²⁶ molecules

Answer

1.00 x 10²⁵ molecules

Answer

1.00 x 10²³ molecules

Answer

1.00 x 10²⁴ molecules

Question 43

A chemist needs 5 moles of sodium hypochlorite (NaClO) that will be added to water to prepare a bleaching solution, how many grams of this compound should be placed in water?

Accepted Answer

370 g NaClO

Answer

540 g NaClO

Answer

270 g NaClO

Answer

74 g NaClO

Question 44

What is the percent composition for carbon and hydrogen in methane (CH4)?

Accepted Answer

H=25%; C=75%

Answer

H=21%; C=79%

Answer

H=27%; C=73%

Answer

H=31%; C=69%

Question 45

How can you apply the knowledge of percentage composition?

Accepted Answer

in knowing the amount of salt in foods

Answer

in determining the origin of the product

Answer

in identifying the element present in the substance

Answer

in checking the value of the substance

Question 46

Antacid tablets contain the compound aluminum hydroxide. It has a chemical formula of Al(OH)3. What is the percentage of aluminum in the compound?

Accepted Answer

35%

Answer

72%

Answer

25%

Answer

63%

Question 47

Which of the following statements is/are TRUE?

I. Percentage composition of compounds may be computed from its chemical formula or experimental data.

II. Percentage composition is helpful in analyzing the purity of the compound

III. Percentage composition is the ratio between the two elements in the compound.

Accepted Answer

I and II

Answer

I and III

Answer

I only

Answer

II only

Question 48

A compound has a molecular formula of C₁₂H₂₄O₆. What is this compound's empirical formula?

Accepted Answer

C₂H₄O

Answer

C₆H₁₂O₃

Answer

C₁₂H₂₄O₆

Answer

CHO

Question 49

The formula that contains the actual number of atoms in a compound is called ___________.

Accepted Answer

molecular formula

Answer

condensed formula

Answer

empirical formula

Answer

structural formula

Question 50

Which of the following is NOT an empirical formula?

I. C₃H₇ II. CaCl₂ III. C₂H₄O₂ IV. C₆H₁₂O₆

Accepted Answer

III and IV

Answer

II only

Answer

I and II

Answer

I only

Related quizzes

Related quizzes