Chemistry Unit Test

Which of the following best describes an electron?

• 
  It has a negative charge and about the same mass as a neutron

• It has a negative charge and much less mass than a proton

• It has no charge and about the same mass as a proton

• It has a positive charge and much more mass than a neutron

Tags

NGSS.MS-PS2-3

Which two elements on the periodic table are in the same period?

• F and Cl

• Be and Ca

• Sn and Rb

• Li and Ga

Identify the parts of the atomic structure.

a

b

c

d

e

Nucleus

Electron Shell

Neutron

Proton

Electron

Tags

NGSS.MS-PS1-1

A chemist made the table below to record some atomic properties of four elements.

Based on the information in the table, which conclusion about the chemical reactivity of these elements is valid?

• Boron is the most reactive because it has the most protons.

• Fluorine is the most reactive because it has 7 electrons in the outer shell.

• Silicon is the most reactive because it has an equal number of protons and neutrons.

• Gallium is the most reactive because it has many more neutrons than protons.

Elements in a ..................have similar chemical properties.  

• period
• group
• row

The ______________ is the number of protons + neutrons in the nucleus of an atom.

• atomic number
• net charge
• chemical symbol
• atomic mass

Tags

NGSS.MS-PS1-1

Match the following amu (atomic mass unit) to their subatomic particle

• 1 amu

• Proton

• 1 amu (+)

• Electron

• 0 amu

• Neutron

Matter can undergo physical or chemical changes. Which of these are examples of physical changes?

Select TWO correct answers.

• Rusting Iron

• Freezing a popsicle

• Breaking an egg

• Burning Wood

• Cooking an egg

The formula for glucose is C₆H₁₂O₆. How many elements does glucose contain?

• 12

• 6

• 24

• 3

Tags

NGSS.MS-PS1-1

A researcher wants to experiment with an element that reacts like phosphorus (P) but has a greater atomic mass. Which element should the researcher select for the experiment?

• 
  Silicon (Si)

• Arsenic (As)

• 
  Sulfur (S)

• Nitrogen (N)