Science Semester Exam Review

A scientist is heating up an unknown sample. Assuming the substance is a solid and the temperature is rising what is occurring at Point 2 in the graph?

• Melting

• Condensation

• Freezing

• Evaporating

A student prepared diagrams to model atoms of two elements. Atoms of which two elements are represented by these models?

• Oxygen, O, and Neon, Ne

• Silicon, Si, and Phosphorus, P

• Fluorine, F, and Neon, Ne

• Beryllium, Be and Boron, B

Tags

NGSS.MS-PS1-1

The diagram below shows a model of an atom. Which of the following could describe a subatomic particle found at location X in the diagram?

• It is located inside the nucleus and has a negative charge

• It has mass and a negative charge

• It is located outside the nucleus in an electron cloud

• It is located inside the nucleus and has a positive charge

Tags

NGSS.MS-PS1-1

Four students were asked to complete a table for a science assignment. Each student selected one chemical element from each of four groups in the Periodic Table and then classified each element as a metal, a nonmetal or a metalloid. Which table is completed correctly?

• Option D

• Option C

• Option B

• Option A

Tags

NGSS.MS-PS1-1

Identify the 2 elements that will conduct electricity AND are found in the same period.

• Lithium and Beryllium

• Nitrogen and Neon

• Carbon and Nitrogen

• Lithium and Nitrogen

Students performed a lab investigation on chemical reactions. The students put on goggles and plastic gloves and then followed the steps below. Which observation would indicate that a chemical reaction occurred?

• The vinegar took the shape of the container in step 1

• The steel wool changed shape during step 6

• The temperature of the vinegar increased during step 4

• The steel wool sank into the vinegar in step 3

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Carbon dioxide (CO2) is a compound with molecules that consist of one Carbon atom and two Oxygen atoms. Why is carbon dioxide a compound and not an element?

• Carbon dioxide contains multiple Oxygen atoms

• Carbon dixoide consists of more Oxygen atoms than Carbon atoms

• Carbon dioxide consists of more than 1 element making it a compound

• Carbon dioxide is a gas

Tags

NGSS.MS-PS1-1

Which of the following substances listed are pure substances?

• None of these are pure substances

• Option I only

• All 4 are pure substances

• Option I and II only

Tags

NGSS.MS-PS1-1

During an investigation, a student combined the 2 clear colorless solutions shown below in the image. 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?

• The solutions reacted chemically

• Some of the water froze into ice crystals

• Rapid evaporation of water occurred, leaving a solid

• One of the original compounds came out of solution

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The formula for caffeine is shown below. Based on the formula we can determine that one molecule of caffeine contains which of the following?

• 8 Carbon atoms, 10 Hydrogen atoms, 4 Nitrogen atoms and 2 Oxygen atoms

• 1 Carbon atom, 8 Hydrogen atoms, 10 Nitrogen atoms, and 2 Oxygen atoms

• 10 Carbon atoms, 8 Hydrogen atoms, 10 Nitrogen atoms and 4 Oxygen atoms

• 8 Carbon atoms, 10 Hydrogen atoms, 2 Nitrogen atoms, and 4 Oxygen atoms

Tags

NGSS.MS-PS1-1