Chemistry Mid-Term

Groups, Periods, and Trends

100

What is the difference between groups and periods? (which has increasing atomic number/ mass and which has similar properties?)

Groups have similar properties

Periods have an increasing atomic mass

200

Generally, how does atomic size vary throughout the periodic table?

Up to down, right to left

300

Name one element that has similar properties to Chlorine:

Fluorine, Bromine, Iodine, Astatine, Ts

400

Within the p-block elements, the elements at the top of the table compared with those at the bottom, 

A. have larger radii

B. Are more metallic

C. Have lower ionization energy

D. Are less metallic

D. Less metallic

500

How do modern scientists use our knowledge of the relationship between element characteristics and atomic mass? 

A. Make computer parts

B. Change atomic makeup of elements

C. Predict properties of new elements

D. Create new elements

C. Predict

States of Matter

100

The random molecular motion of a substance is greatest when the substance is:

A. Condensed

B. A liquid

C. Frozen

D. A gas

D. A gas

200

Give an example of a chemical change

Lots of correct responses: burning, etc. 

300

Which phase change is described correctly?

A. Solid to gas is called deposition

B. Gas to solid is sublimation

C. Liquid to solid is freezing

D. Solid to liquid is vaporization

C: Solid to liquid: Freezing

400

Which of the following is a physical change?

Peach spoiling

Copper bowl tarnishing

Bracelet turning your wrist green

Dissolving salt in warm water

Dissolving salt in warm water

500

Which of the following is most likely a gas?

A. Metal 

B. Non-metal

C. Metalloid

D. Lanthanum

B. Non-metal

Chemical Bonds

100

When cations and anions join, they form what type of chemical bond?

Ionic, Covalent, or Metallic??

Ionic

200

An ionic compound is a giant structure of ions called:

A. Ionic structure

B. Covalent Structure

C. Ionic lattices

D. VSEPR

C: Ionic lattices

300

An ionic bond is formed when one or more electrons are:
A. Equally shared

B. Unequally shared

C. Transferred from one nucleus to another

D. Transferred from the valence shell of one atom to another

D. Valence shell transfer

400

Which of the following is an ionic bond? (SELECT ALL THAT APPLY)

NaCl

CO₂

KCL

CH₄

NaCl and KCl

500

Which of the following is not a property of an ionic bond?

A. Form crystals

B. Lose an electron

C. Poor conductor of electricity but only when dissolved in water

D. Have high melting points and high boiling points

Poor conductor of electricity but only when dissolved in water

Atoms and Theories

100

How many protons does Fe have if it has a mass number of 57?

31

200

Which part of the atom is most directly involved in bonding?

the electron

300

An element has an atomic number of 8 and a mass number of 19, how many neutrons does it have?

11

400

What is the total number of atoms represented in one molecule of (CH₃)₂NH

10

500

Which idea of Dalton is incorrect? (SELECT ALL THAT APPLY)

A. Atoms are small and tiny

B. Atoms of the same element are identical

C. Atoms can not be destroyed

D. Atoms of different elements combine in simple whole-number ratios to form compounds

B and C

Math and Moles

100

The true value is 9.8. If the results are 7.6, 7.3, 7.5, and 7.5, then the results are: 

A. Accurate

B. Precise

C. Neither

D. Both

B: Precise

200

How many total electrons does the iron ion have when it forms the ionic compound FeCl6

A. 26

B. 24

C. 21

D. 20

D. 20

300

The number 0.020 has how many significant figures? 

2

400

How many moles are in 48 grams of Carbon?

4 moles

500

A mass of 32.07 grams of sulfur will have ______ amount of atoms compared to 207.2 grams of Pb. 

A. Equal

B. More

C. Less

D. Exactly twice as much

Equal