2025 Intro to Chem and Water

Multiple Choice

What is matter?

• Anything that has mass and volume

• Everything inclulding energy

• A state of being a liquid

• Only things that have energy

Categorize

Options (7)

6

The number of protons in a single atom of an element

1 or 2 letters used to represent each element

C

12.01

The total mass of the neutrons and protons in an atom

Found by subratcting the atomic number from atomic mass

Use the information from the picture to categorize the elements properties according to the periodic table

Atomic number

Element symbol

Atomic Mass

Number of Neutrons

Labelling

Label this atom's particles.

Drag labels to their correct position on the image

Protons

Electrons

Neutrons

Nucleus

Multiple Choice

Compounds

• are made of two or more types of atoms chemically bonded together

• are made of one type of atom

• are found on the periodic table

• can be separated into their individual parts through physical means

Multiple Choice

A(n) _____ is a chemically pure substance that is made of two or more atoms bonded together. The atoms can be of the same or of different elements

• Element

• Compound

• Mixture

• Molecule

Multiple Choice

Why do elements bond?

• To be friends
• To create a new element
• To become stable

Multiple Choice

How are covalent bonds formed?

• Sharing of electrons
• Transfer of electrons

Multiple Choice

How are ionic bonds formed?

• Transfer of electrons
• Sharing of electrons

Multiple Choice

What is a valence electron?

• The sum of neutrons and protons.
• The # of electrons in the last shell.
• A type of bond.
• A popular compound.

Multiple Choice

The octet rules states that most elements want to have _____ valence electrons.

• 2

• 4

• 6

• 8

Multiple Choice

How many valence electrons does Oxygen (O) have?

• 6

• 8

• 15

• 16

Multiple Choice

What type of bonding does this picture show?

• Ionic

• Covalent

Why water is polar:

Sharing of electrons is unequal between atoms

-The electrons spend more time around the oxygen atom, making the oxygen more negative.
-Because electrons spend less time around the hydrogen atoms, they are more positive.
-Causes the molecule to be bent.

Multiple Choice

A water molecule is a _______ since the negative end of one water molecule is attracted to the positive end of another water molecule.

• polar molecule
• sustain life
• surface tension
• specific heat

Multiple Choice

A liquid substance capable of dissolving other substances is called a...

• solvent
• solute
• solution

Multiple Choice

An attraction between molecules of different substances is called...

• cohesion
• adhesion

Multiple Choice

Water is called the ________ because it dissolves so many substances.

• surface tension
• universal solvent
• capillary action
• specific heat

Multiple Choice

Why does ice float?

• water expands when it freezes, making ice less dense than water

• water compacts when it freezes, making ice more dense than water

• hydrogen bonds in water push the ice to the surface

• ice is afraid of water, and avoids it

Multiple Choice

What is the correct chemical formula for water?

• H₂O

• HO₂

• H₂O₂

• ₂H₁O

Multiple Choice

You body sweats to help prevent you from overheating. How does water regulate temperature?

• it lets heat pass through it

• it absorbs a lot of heat, then decreases in temperature

• it absorbs a lot of heat, but only increases a little in temperature

• heat is afraid of water and avoids it

Multiple Choice

A water strider can skate along the top of a pond because:

• covalent bonds result in water cohesion (surface tension)

• hydrogen bonds result in water cohesion (surface tension)

• water striders have adapted to take advantage of water cohesion

• water striders are afraid of water and avoid it

Multiple Choice

Peyton wants to see if the salinity of water affects the population numbers of anchovies in a local body of water.

What would be the INDEPENDENT variable in his experiment?

• Biomass of aquatic plants

• Level of salinity in a given area

• Water temperature

• Total number of fish observed

After you finish this:

Use the information in this presenation to complete the water properties graphic organizer that you teacher will give you. The graphic organizer is on paper.