Chem exam

A vibrant illustration of various chemical elements and compounds interacting with water, showcasing ionic and covalent bonds, with a colorful background representing the periodic table.

Chemistry Challenge: Test Your Knowledge!

Welcome to the ultimate chemistry quiz, designed to challenge your understanding of fundamental concepts. This quiz features a range of questions that touch on key areas of chemistry, including bonding, molecular structures, and the behavior of elements.

81 engaging multiple-choice questions
Covering essential topics in chemistry
Suitable for students, teachers, and enthusiasts

81 Questions20 MinutesCreated by ExploringAtom57

1. Which of the following terms would best classify a sample of pure sodium chloride?

A. An element

B. Highly reactive metal

C. A poisonous gas

D. A compound

2. What feature of water molecules enables ionic substance to dissolve in water?

A. The water molecules have a certain shape that allows them to surround the ions in solution.

B. The water molecules react with the ions.

C. The water molecules are sticky and can adhere to the ions.

D. The water molecules are polar and are attracted to the positive and negative ions, surrounding them.

3. Which of the following molecules would one expect to have a non-polar covalent bond?

A. HCl

B. F2

C. HF

D. ClF

4. How many electrons are being shared between the two carbon atoms in the compound ethyne? Ethyne has the Lewis structure: H−C≡C−

A. 1

B. 2

C. 3

D. 6

5. If a covalent bond were to be formed between a nitrogen atom (electronegativity 3.0) and an oxygen atom (electronegativity 3.5), which of the following statements would best describe such a bond?

A. Non-polar covalent

B. Polar covalent where the oxygen atom carried the partial negative charge

C. Polar covalent where the nitrogen atom carried the partial negative charge

D. Polar covalent where the oxygen atom carried the partial positive charge

6. Which statement is true of covalent bonds?

A. No matter the element, there is the same bond length between neighboring atoms.

B. Valence electrons must be shared equally between atoms in order to achieve stability.

C. Covalent bonds form when the nuclei of two atoms attract each other.

D. Atoms find the ideal separation distance where electrostatics forces are reduced to a minimum.

7. Linus Pauling is famous for

A. Proposing the idea of valence octets.

B. Proposing that ionic and covalent bonds are at opposite ends of a chemical bonding spectrum.

C. Devising dot diagrams to represent the electron configuration of atoms.

D. Discovering that there are multiple covalent bonds between some atoms.

8. The three dots in the Lewis dot diagram for boron indicate that it

A. Can bond with three other atoms.

B. Can only form triple covalent bonds.

C. Has three valence electrons.

D. Scores a 3 on Pauling's electronegativity scale.

1. Calcium Oxide is a (an) _____ compound and the formula for Calcium Oxide is ________

Covalent, CaO2

Ionic, CaO

Ionic, CaO2

2. Non-metals tend to _______ electrons to be come ________ ions

Lose, positive

Gain, negative

Lose, neutral

4. Oxygen has 6 valence electrons and it is diatomic. How many covalent bonds are there in an O2 molecule ?

Single

Double

Triple

13. From the list of elements given, select 2 elements that would likely form an ionic bond. K, C,

Br, Ar.

K, Br

Ar, C

K, Ar

14. How is the bond in F2 different from the bond in KCl ?

F2 is covalent and KCl is ionic

F2 is ionic and KCl is ionic

F2 is ionic and KCl is covalent

15. Hydrogen Fluoride has a (an) ________ bond and its chemical formula is _______

Covalent, HF

Ionic, HF

Covalent, H2F

18. Write the chemical formula for a compound that has one Calcium atom and 2 Chlorine atoms. Predict the bond between them

CaCl2, ionic

CaCl2, covalent

Ca2Cl, ionic

19. The process of becoming an ion from an atom is called as ________.

Ionization

Electrolysis

Electron affinity

Atoms are made up of three basic parts, which are -

Protons, neutrons, electrons

Neutrinos, protons, neutrons

Quarks, protons, electrons

Electrons, neutrons, and quarks

The nucleus is made up of -

Neutrons and electrons

Protons and neutrons

Protons and electrons

Electrons and quarks

Where are the electrons found in an atom?

In specific orbitals, like planets around the sun

In a cloud around the nucleus

In the nucleus

In a blob of positive matter

We use a model to learn about the atom - Why?

It is too small to be seen

Atoms are rare and hard to find

All atoms are dangerous to work with

All of the above

Which scientist saw the atom as a positively charged blob with negative particles inside, similar to a Chocolate Chip Cookie

A. Thomson

B. Dalton

C. Bohr

D. Rutherford

Which scientist explained that electrons were moving in fixed shells or orbits around the nucleus?

Dalton

Thomson

Rutherford

Bohr

Which scientist saw the atom as mostly empty space with electrons moving around the nucleus? He was the first to find the nucleus.

A.Dalton

B. Thomson

C. Rutherford

D. Bohr

. Scientist of the model of the atom in which the individual atoms are tiny solids like marbles

Dalton

Thomson

Rutherford

Bohr

One of Dalton's conclusions of his atomic theory was that all atoms of the same element are -

Reactive

Different

Combined

The same

Which scientist fired positively charged particles of light into a sheet of gold to come up with his theory?

DALTON

Thomson

Rutherford

Bohr

Which atomic model describes the structure of an atom to be much like the solar system

Dalton

Thomson

Rutherford

Bohr

Atoms are the basic building blocks of ¬¬¬¬_____that make up everyday objects. Answer choices

Atoms

Mass

Matter

Volume

How is the modern model of an atom different from the Bohr atomic model?

The masses of the atomic particles are different

The numbers of electrons are different.

The shapes of the nuclei are different.

The arrangement of the electrons are different.

_____________ are the smallest unit of matter that retains the identity of the substance.

Compounds

Atom

Water

H20

The nucleus of the atom has the ___________ and ___________ in it.

Protons ans neutrons

Electrons and neutrons

Protons and electrons

What is Chemical Change

Anything that changes its shape

Anything that creates a new substance

Anything that changes color

Anything that melts

The mass of an object _______ as it moves away from the center of Earth

Stays the same

Decreases

Increases

Doubles

The table shows data from a laboratory experiment in which Andrew measured the temperatures of water in various states. Which of the following would be a correct conclusion from this experiment?

The particles in iced water have less energy than the particles in ice have.

The particles in ice have more energy than the particles in water have.

The particles in iced water have more energy than the particles in boiling water have.

The particles in boiling water have more energy than the particles in iced water have.

Which of the following sentences best describes the process that happens when liquid water becomes ice?

Energy is added to the water, so its particles move more slowly.

Energy is added to the water, so its particles move more quickly.

Energy is removed from the water, so its particles lock into place.

Energy is removed from the water, so its particles move more randomly.

Which of the following could describe oxygen at room temperature?

It has a constant volume and a definite shape

It has a constant volume but takes the shape of its container.

Its particles move fast enough to overcome the attraction between them

Its particles have a very orderly, three-dimensional arrangement.

. Kevin compared the viscosities of several fluids. Substances A, B, and C flowed at different rates, but substance D did not flow at all. Which of the following is a valid conclusion?

Substance D must be at its melting point.

Substance D’s particles have strong attraction for one another.

Substance D is neither a liquid nor a gas.

Substance D’s particles have little attraction for one another.

. In a laboratory experiment, Joel observed water as it vaporized, froze, melted, and condensed. Which of the following is a valid conclusion?

He observed four different changes of state.

He observed two different chemical changes.

All of the changes required energy to be absorbed.

All of the changes required energy to be released.

A cup filled to the rim with water was left at room temperature overnight. The figure above shows how much water was left the next morning. Which of the following is a reasonable hypothesis for what happened to the water?

The water molecules at the surface lost enough energy to evaporate

The water molecules at the surface gained enough energy to evaporate.

The water molecules at the surface lost enough energy to condense.

The water molecules at the surface gained enough energy to sublimate.

A sealed, inflated beach ball was placed in a freezer overnight. The next day, the ball was still sealed but had shrunk. Analyze the following hypotheses to determine which is the best.

The pressure inside the ball increased, so the gas particles moved faster.

The gas inside the ball escaped, which caused the ball to shrink.

The temperature of the gas increased, which pushed gas out of the ball.

The temperature of the gas decreased, so the particles of gas moved closer together

In a laboratory investigation on changes of state, Rebecca observes that the melting point of water is 0°C and that the freezing point of water is 5°C. What conclusion can Rebecca draw from these observations?

Both melting and freezing are exothermic reactions.

Water boils at 0oC at normal atmospheric pressure.

Melting and freezing cannot occur at the same temperature.

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