Chemistry Midterm 2020

How many significant figures does the following number have: 2001800.

• 1
• 4
• 6
• 7

The majority of elements on the periodic table are

• man made.
• nonmetals.
• metals.
• gases.

A cube has a volume of 8.0cm³ and a mass of 21.6g. What is the density of the cube in grams per cubic centimeters. 

• 2.7
• .37
• 2.70
• 0.370

To determine density of a irregular shape a student immersed the object in 21.2mL of water and caused the water to rise to 27.8mL. If the object mass is 22.4g, what is the density?

• 27.8g/mL
• 3.0g/mL
• 6.6g/mL
• 3.4g/mL

In the modern periodic table elements are arranged by:

• atomic mass
• atomic number
• valence electrons
• number of isotopes

An element with a mass number of 11 and an atomic number of 5 has how many neutrons?

• 11
• 5
• 6
• 16

Tags

NGSS.MS-PS1-1

An atom has 10 protons, 15 neutrons and 10 electrons what is its mass number.

• 20
• 10
• 5
• 25

Tags

NGSS.MS-PS1-1

Which two subatomic particles make up the nucleus of an atom?

• Protons and Electrons
• Neutrons and Electrons
• Electrons and Protons
• Protons and Neutrons

Tags

NGSS.HS-PS1-8

Rutherford's gold foil experiment provided evidence that...

• Negative and positive charges are spread evenly throughout the atom.

• Alpha particles have a positive charge.

• Gold is not a dense as previously thought.

• There is a dense positively charged nucleus at the center of an atom & the rest is mostly empty space

Tags

NGSS.HS-PS1-8

Which graph shows the correct relationship between temperature and kinetic energy?

• A

• B

• C

• D

Tags

NGSS.HS-PS3-2