1st Nine Weeks Test

If particle 1 is a proton, which particle would represent a neutron?

• 2

• 3

• 1

• none of the them

Tags

NGSS.MS-PS1-1

The subatomic particles of an atom are the protons, neutrons, and electrons. Which of these are located in the nucleus

• protons and electrons

• electrons and neutrons

• protons and neutrons

• all of them

How many protons, neutrons, and electrons are present in an atoms of hafnium, Hf, with a mass number of 178? (use your periodic table reference sheet)

• 72 protons, 178 neutrons, 106 electrons

• 72 protons, 106 neutrons, 72 electrons

• 178 protons, 250 neutrons, 72 electrons

• 106 protons, 72 neutrons, 106 electrons

Tags

NGSS.MS-PS1-1

Which statement below is true?

• The compound is made up of multiple atoms.

• This element is made up of two different atoms.

• It is an allotrope representing a hydrobromide ion.

• This structural geometry shows elemental bromide.

Tags

NGSS.MS-PS1-1

In the classification of matter chart, letter B. would be a(n)

• acid

• base

• compound

• element

Elements are composed of

• many types of atoms.

• the same types of atom.

• many different compounds.

• the same type of compound.

Tags

NGSS.MS-PS1-1

During an investigation, a student combined the two clear, colorless solutions shown above:

The student observed that the temperature changed from 25◦C to 23◦C when the solutions were combined and that a white substance rapidly formed and settled to the bottom of the container. What most likely happened to produce these results?

• One of the original compounds came out of solution.

• Some of the water froze into ice crystals

• Rapid evaporation of water occurred, leaving a solid.

• The solutions reacted chemically.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Many processes occur in the digestive system. Which process is best classified as a physical change?

• Saliva converting the starch molecules in crackers into simple sugars

• Digestive enzymes breaking down proteins into smaller fragments

• Bacteria converting lactose into simple sugars in the intestines

• Teeth grinding an almond into pieces

A student is conducting an investigation to observe chemical reactions. The student obtains two strips of magnesium, Mg, ribbon that are each 3 cm long. One strip of magnesium is placed in a test tube containing 5 mL of water. The other strip of magnesium is placed in a test tube containing 5 mL of hydrochloric acid, HCl.

Both liquids are at room temperature.

The student’s observations are recorded in the table. Which statement is not supported by the student’s observations?

• A chemical reaction takes place between magnesium and hydrochloric acid.

• A gas is released in Test Tube 2.

• The substances in both test tubes are reactive only at high temperatures.

• Energy is released in the reaction involving hydrochloric acid.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

The chemical formula of magnesium sulfate is MgSO4. Two molecules of magnesium sulfate (2MgSO4) has _____.

• four atoms of oxygen (O)

• four atoms of silicon (Si)

• two atoms of magnesium (Mg)

• two atoms of oxygen (O)

Tags

NGSS.MS-PS1-1