WorksheetsChemical Interactions Inv. 1-2
Total questions: 23
Worksheet time: 12mins
What is the difference between the substances represented by the symbols Co and CO?
They are two different ways to represent the element cobalt.
One is the symbol for an element, and one is a formula for a compound
Co represents the element cobalt, and CO represents the element copper
They represent two substances, each made up of two elements
What was Mendeleyev's purpose for reorganizing the periodic table?
He wanted to fit all the elements on one page instead of in a long line
He wanted to put elements with similar characteristics in the same column
He wanted to order the elements from the lightest to the heaviest
He wanted to put all the metals on one side of the table and gases on the other
Which substance from the KEY is Sample B describing?
Alum
Citric Acid
Epsom Salts
Sodium Chloride
True or False: An element symbol can have TWO capital letters. For example PB is lead
True
False
Which of the following is correct when it comes to CO2?
One Carbon Two Oxygen
One Carbon One Oxygen
One Cobalt
Two Cobalt
A student mixes a white solid and a clear liquid together. Which observations are evidence that a chemical reaction has NOT occurred?
It turned a different color.
The solid disappears into the liquid
it bubbles and fizzes
It gets warmer
When Mendeleyev changed the layout, there were gaps where no known element fit. How did the gaps NOT help scientists look for undiscovered elements?
The gaps predicted the mass of new elements
The gaps predicted the characteristics of new elements.
The gaps showed scientists what elements could do.
The gaps showed scientists what elements could not exist
You mix 2 substances and you get bubbling and fizzing. Has a chemical reaction occurred?
Yes
No
You mix 2 substances and you get a color change that has occured. Has a chemical reaction occurred?
Yes
No
What substance was the student describing for Sodium Chloride?
The crystals are hexagonal in shape and sometimes stick together.
The crystals are long and narrow. They look like small rectangular sticks that stick together randomly.
The crystals look like cubes and seem much smaller than the crystals of other samples. The crystals don't seem to stick together.
The crystals look similar to snowflakes and are big in size.
What substance was the student describing for Citric Acid?
The crystals are hexagonal in shape and sometimes stick together.
The crystals are long and narrow. They look like small rectangular sticks that stick together randomly.
The crystals look like cubes and seem much smaller than the crystals of other samples. The crystals don't seem to stick together.
The crystals look similar to snowflakes and are big in size.
What substance was the student describing for Epsom Salts?
The crystals are hexagonal in shape and sometimes stick together.
The crystals are long and narrow. They look like small rectangular sticks that stick together randomly.
The crystals look like cubes and seem much smaller than the crystals of other samples. The crystals don't seem to stick together.
The crystals look similar to snowflakes and are big in size.
Based on the answer choices below, which answer provides some ideas about how to identify a substance?
Only making observations of the substance without testing out anything.
Figuring out what mixture in the world has the substance in it.
Guessing what elements are in the substance without observations and tests.
Breaking down the substance into its individual elements by making observations and completing lots of individual tests.
Elements can be combined to make up substances on Earth.
True
False
A result of a chemical reaction includes (but is not limited to)... Check all that apply.
bubbling
fizzing
smoke
color stays the same
temperate change
Every time a chemical reaction occurs, a _______________ is created.
bubble or fizz
smoke
temp change
a new substance
a type of matter defined by a unique particle
element
mass
substance
A chemical reaction occurs when substances interact to form __________________. (Choose the BEST answer.)
no new creation
new substances
an odor
fizz
