Chem Unit Test(Isabella V)

Periodic Trends

100

The higher the electronegativity, the higher the likelihood for the atom to become an anion
(True/False)

True

200

What element has the most electronegativity and the least electronegativity?

Fluoride has the most electronegativity, and Francium the least electronegativity

300

The ability of an Atom's inner electrons to shield its nucleus. What is this called?

Electron shielding

400

Name three groups in the periodic table.

All groups: Alkali metals, Alkaline earth metals, Lanthanides, Actinides, Transition metals, Boron group, Carbon group, Pnictogens, Chalcogens, Halogens, Noble gases.

500

From top to bottom does metallic character increase or decrease?

Increase

Chemical Bonds and Forces

100

Chemical bond formed when two atoms share one or more pairs of valence electrons. What is this?

Covalent Bond

200

Occurs when electrons are transferred from one atom to another.

Ionic bonds

300

Occurs when the shared are not equally shared. This occurs when one atom has higher electronegativity.

What type of bond is this?

Polar covalent bond

400

What are the three types of intermolecular forces?

Dipole-Dipole interaction, Hydrogen bond, London Dispersion forces.

500

Strong chemical bonds that hold atoms together within a molecule. What type of force is this?

hint: They are located within a SINGLE molecule and hold the atoms together.

Intramolecular forces.

Physical and Chemical changes

100

What is a physical change?

Changes that DO NOT create a new substance or change the chemical composition.

200

AB + CD     --->    AD + CB

What type of reaction is this?

Double Displacement

300

AB + C   ----->   AC + B

What type of reaction is this?

Single displacement

400

occurs when two(or more) atoms or molecules come together.

What type of reaction is this?

Combination reactions/synthesis reactions

500

CH₄ + O₂   ------->    CO₂ + H₂O

What type of reaction is this?

Combustion

states of matter

100

What are the properties of a solid?

Think about definite shape and volume

A solid has a definite shape and volume

200

compressing a gas is easier than compressing a solid or a liquid due to the space between particles.
(true/false)

True

300

How many states of matter are there? And what are they?

There are 4 states of matter. Solid, liquid, gas, and plasma.

400

Give 5 examples of gases.

Oxygen, helium, hydrogen, carbon dioxide, nitrogen, etc.

500

What are examples of plasma? and where can I find it?

Space. some examples are lighting and stars.

pH scale

100

The pH scale ranks different __________ based on their _____ levels.

aqueous solution, acidity.

200

The more hydroxide ions (OH^-) the more acidic a solution is.

(true/false)

False

300

If Timmy dips a blue litmus paper into a solution and it stays the same, but then he dips a red litmus paper into a solution and that one stays the same too, what does that mean?

It means Timmy's solution is neutral

400

On the pH scale each pH jumps by ___, if so than

how much greater is a pH of 3 acidic compared to a pH of 6?

10x

and it would be 1000x more acidic

500

OH^-  >  H₃O⁺

Is this solution more acidic or more basic?

Its more basic