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WorksheetsCFU 8.5D & 8.5E Quiz
Total questions: 10
Worksheet time: 8mins
A chemical formula is provided below. How many atoms are contained in the substance?
H2SO4
3
6
7
10
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.
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.
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
How many atoms of hydrogen (H) are found in (NH4)2CO3?
8
4
2
9
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
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.
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.
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.
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.
