Unit 3&4 Review

An airplane travels a distance of 4,000 km from New York to Los Angeles in 5 hours. Enter the numerical value for the average speed of the airplane.

Answer: ___km/h

The chemical formula for methane is CH₄. This is an example of-

• an ion

• a compound

• an element

• a cation

Tags

NGSS.MS-PS1-1

An equation for a chemical reaction is shown.

NaOH + HCl --> NaCl + H₂O

Which provides evidence that mass is conserved in the reaction?

• Two new substances are formed in the product.

• Water is one of the products, but not one of the reactants.

• Two Hydrogen atoms are in the reactants, and two Hydrogen atoms are in the products.

• One chlorine atom pairs with a sodium atom in the products.

Tags

NGSS.MS-PS1-5

Which of these observations is an indication that a chemical reaction has occurred?

• Steam forms above boiling water.

• A solid is formed when two clear solutions are mixed.

• A solid forms when a clear solution is frozen.

• Smaller solids are formed when a larger solid is broken down using a hammer.

Tags

NGSS.MS-PS1-2

Calculate the average speed of the object between 1 and 3 seconds.

Answer: __ m/s

Tags

NGSS.MS-PS3-1

Students mix two liquids in a beaker and listed their observations. Based on these observations, which statement contains the best evidence that a chemical reaction occurred?

• There is a change in shape.

• There is a change in volume.

• The two liquids mix into a solution.

• The two liquids form a new substance.

Tags

NGSS.MS-PS1-2

The names and chemical formulas of four substances are shown in the chart. Which substance listed in the chart is made up of the most atoms?

• Carbonic Acid

• Nitric Acid

• Phosphoric Acid

• Sulfuric Acid

Tags

NGSS.MS-PS1-1

A compound secreted by honeybees to paralyze intruders in their hives is known as 2- heptanone. The formula for this compound is shown.

CH₃C₄H₈COCH₃

How many atoms of each element are in one molecule of 2-heptanone.

​ (a)   Carbon atoms, ​ (b)   Hydrogen atoms, ​ (c)   Oxygen atoms

• 7
• 14
• 1
• 8
• 6
• 4
• 3
• 11

Tags

NGSS.MS-PS1-1

Matter can undergo physical and chemical changes. Categorize the following as either a physical or chemical change.

Groups:

(a) Physical Change

,

(b) Chemical Change

• Cooking an Egg

• Burning Wood

• Freezing a Popsicle

• Breaking an Egg

• Ripping Paper

• Rusting Iron

Tags

NGSS.MS-PS1-2

Organize the following into either Acid or Base characteristics.

Groups:

(a) Acid Characteristics

,

(b) Base Characteristics

• Litmus paper RED

• Bleach

• Bitter Taste

• Lemons

• Litmus paper BLUE

• Soaps

• Vinegar

• Reacts with Metals

• Slippery feel

• Sour Taste