CFU 8.5D & 8.5E Quiz

A chemical formula is provided below. How many atoms are contained in the substance?

H₂SO₄

• 3

• 6

• 7

• 10

Tags

NGSS.MS-PS1-1

A chemical formula is shown below. The subscripts in a chemical formula represent the-

NaNO₂

• A. number of atoms of the element in front of the subscript.

• B. atomic mass of the heaviest element in the compound.

• C. atomic number of the element that follows the subscript.

• D. column on the Periodic Table of the element next to it.

Tags

NGSS.MS-PS1-1

Which of the following could be determined using only the chemical formula of a carbohydrate?

• A. The chemical properties of the carbohydrate.

• B. The conductivity of the carbohydrate in water.

• C. The number of atoms of each element contained in the carbohydrate.

• D. The physical state of the carbohydrate at standard room temperature.

Tags

NGSS.MS-PS1-1

A model of one molecule of a chemical compound is shown. What is the correct way to write the formula for three molecules of this compound?

• A. 2H₂O

• B 3(2H₂O)

• C. H₂O₂

• D. 3H₂O₂

Tags

NGSS.MS-PS1-1

How many atoms of hydrogen (H) are found in (NH₄)2CO₃?

• 8

• 4

• 2

• 9

Tags

NGSS.MS-PS1-1

During an investigation, two flasks of unknown, clear liquids are combined in a beaker and the following observations are recorded. Which of the listed observations indicate a new substance was formed during this investigation?

I. Solution color remains clear

II. The amount of solution in the beaker increased

III. Solution temperature changed from 10 degrees C to

20 degrees C

IV. Some of the liquid remained in the flasks

• A. I and II

• B. I, II, and IV

• C. III, only

• D. I and III

Tags

NGSS.MS-PS1-2

Which of the following examples would support that a chemical reaction has occurred?

• A. After putting liquid batter into a hot pan, the batter solidifies and begins to turn brown.

• B. After turning on a blender filled with fruits, the fruit is chopped up and mixed together.

• C. After taking a tray filled with ice cubes out of the freezer, the cubes begin to melt.

• D. After adding a spoonful of sugar to a mug of hot coffee, the sugar dissolves completely.

Tags

NGSS.MS-PS1-2

When vinegar and baking soda are combined, bubbles begin to form. Bubbles are evidence of a chemical reaction because they -

• A. are less dense than air.

• B. form at a fast rate.

• C. released a gas

• D. have no mass.

Tags

NGSS.MS-PS1-2

During an experiment, a student combines a solid, metallic substance with a clear liquid in a beaker. The mixtures turns hot, produces bubbles, and sparks. Based on the observations, the student can conclude that –

• A. a phase change has occurred.

• B. atoms have been rearranged to form a new substance.

• C. the products are likely harmful to human skin.

• D. the metal substance is a poor conductor of heat.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

An experiment is performed in which a crystalline substance is added to a beaker filled with room temperature water. All of the following observations would serve as evidence that a chemical change occurred, EXCEPT –

• A. the crystals dissolve.

• B. a precipitate is formed.

• C. the bottom of the beaker feels warm to the touch.

• D. bubbles begin forming within the water.

Tags

NGSS.MS-PS1-2