H Bio - Atoms, Chemical Bonding, and Water Quiz - Jenna Dailey | Biblioteka

2

Which statement about water is false?

Water in its purest state has a neutral pH.

The atoms of a water molecule are joined together by covalent bonds.

The oxygen atom of a water molecule has a partially positive charge.

Water is composed of 2 hydrogen atoms and 1 oxygen atom.

2

Cobalt has an atomic mass of 59 and an atomic number of 27. How many neutrons does cobalt have?

27

59

15

32

2

Which of the following identifies the number and location of protons in a lithium atom?

3 protons, located in a shell

4 protons, located in the nucleus

7 protons, located in a shell

3 protons, located in the nucleus

2

In a sugar water solution...

the sugar stays suspended in the water.

the sugar is the solvent.

the water is the solute.

the water is the solvent.

5

Match each description with the correct property of water.

Stavka koja se može prevući		Odgovarajuća stavka
Water is great at breaking apart substances due to its partial charges.		Cohesion
Water acts as a great barrier due to its cohesive forces.		High Heat Capacity
Water forms droplets.		Capillary Action
Water can move against the force of gravity by traveling through blood vessels from our feet to our heart.		Surface Tension
Water has a resistance to changes in temperature.		Universal Solvent

2

Which statement about polar molecules is true? Select all that apply.

Many ionic compounds are polar.

Water is a polar molecule.

The atoms in polar molecules do not evenly share electrons.

Polar molecules can hydrogen bond with other polar molecules.

2

Which statement about ionic bonds is true? Select all that apply.

They form when atoms share electrons.

It is an attraction between polar molecules.

They form when atoms transfer electrons.

It creates a magnetic attraction between positively and negatively charged ions.

2

What defines if an atom is stable?

Stable atoms have their outermost shell full of electrons.

Stable atoms have 8 electrons in their 3rd shell.

Stable atoms have an equal number of protons and electrons.

Stable atoms do not have isotopes.

2

Which statement about potassium-42 is true? Select all that apply.

It is an isotope of potassium.

It has 23 protons in its nucleus.

It has an atomic number of 42.

It has an atomic mass that differs from potassium-40.

2

Examine the diagram below. Which statement below is false?

The calcium and chlorine atoms are covalently bonding together.

After chemical bonding, all 3 atoms are stable.

The resulting compound is CaCl₂.

Calcium becomes a positively charged ion.

3

In the space below, draw a sodium atom with all its subatomic particles.

8

Please drag each statement under its correct category (acid, base, or water).

An example is bleach.
Releases more H⁺ ions than OH^- ions in solution.
Releases equal concentrations of H⁺ and OH^- ions in solution.
Releases more OH^- ions than H⁺ ions in solution.
An example is lemon juice.
Has a pH less than 7.
Has a pH of 7.
Has a pH greater than 7.

Acid
Base
Water

2

Draw 2 water molecules. (You do NOT need to include the subatomic particles in the atoms.) In your drawing, label a hydrogen bond and a covalent bond.

3

Potassium oxide is a compound formed via ionic bonding between potassium (K) and oxygen (O) atoms. Demonstrate how this ionic compound forms. You only need to include the electrons in your atoms.

4

Organic chemistry studies carbon-based molecules. Due to its atomic structure, carbon atoms form the base of many large, complex molecules. In the space below, draw a carbon atom. Then, explain why carbon is an important atom in creating large molecules, such as the one shown below.