Unit 1
Isotopes and Bohr Models
Unit 2
Atomic Structure (Lewis Dot)
Potpourri
100

When mixing an acid with water, this substance should always be added to the other.

What is acid?

100
What is a good definition for an isotope?
What is each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties.
100

This type of property can be observed or measured without changing the composition of a substance.

What is a physical property?

100

Draw the Lewis-Dot Structure following element: Carbon:

Should have C in the middle with 4 dots, one on each side

100
What are the charges on protons, neutrons, and electrons?
Protons are Positive+, Neutrons are Neutral (0), and Electrons are Negative (-)
200

This is defined as anything that has mass and takes up space.

What is matter?

200

Draw a Calcium atom Bohr Model.

Calcium Atom should have 20 Protons and 20 Neutrons in the center with 4 rings. 2 on the outermost shell.

200

This state of matter has a definite volume but takes the shape of its container.

What is a liquid?

200

Draw the Lewis-Dot Structure of the following element: Lead

Pb in the middle with 4 dots, one on each side

200

You measured the density of a piece of wood, then cut it in half. What is the density of the wood now?

Stays the same

300

Using dimensional analysis, convert 2.5 miles into inches.

What is 158,400 inches?

300

Draw a Chlorine-37 Isotope.

The Chlorine-37 Isotope should have 17 as the atomic number on bottom and 37 on top for the mass number. 

300

When a solid changes directly into a gas without becoming a liquid first, this phase change has occurred.

What is sublimation?

300

Draw the Lewis-Dot Structure of the following element: Chlorine

Cl in the middle with 7 dots, 3 pairs and 1 single

300

A student has a mixture of iron filings and sand. Which separation technique from your notes would be the best choice?

What is magnetism?

400

A student takes several measurements that are very close to one another but far from the accepted value. These measurements are considered this.

What is precise but not accurate?

400
How do the chemical properties of different isotopes of the same atom compare with one another?
All isotopes of an atom have the same chemical properties. They are identical! They just have different masses.
400

A student mixes two substances and a solid suddenly forms. According to the notes, this is one indicator that this type of change may have occurred.

What is a chemical change?
Bonus: What is a precipitate?

400

Draw the Lewis-Dot Structure of the following element: Helium

He in the middle, 2 dots, 1 on top and one on the side

400

Scientists discover a substance that contains two or more different elements chemically combined. What classification of matter is it?

What is a compound?

500

An object has a mass of 50 g and a volume of 25 mL. Calculate its density and determine whether it would sink or float in water.

hat is 2.0 g/mL, and it would sink?

500
Draw K-39 and K-40.
K has 19 protons, so K39 should have 20 neutrons and K-40 should have 21 neutrons. Both have 19 electrons.
500

This type of mixture has a constant, uniform composition throughout, such as salt water or air.

What is a homogeneous mixture?

500

Draw the Lewis-Dot Structure of the following element: Krypton

Kr in the middle, 8 dots, a pair on each side. 

500

Who are we playing tonight?

Katy

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