Notes

Question 1
A juice bottle contains the directions "Shake well before using." This indicates the juice mixture is most likely a __________________________.
a. suspension
Selected: b. colloidThis answer is incorrect.
c. element
d. compound
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Question 2
Which of the following is NOT a pure substance?
a. carbon dioxide
Selected: b. milkThis answer is correct.
c. oxygen
d. water
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Question 3
I spent ________________ minutes reading this textbook section prior to answering these assigned questions.
Selected: a. between 10 and 20This answer is correct.
b. between 0 and 5
c. between 5 and 10
d. zero
e. over 20
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Question 4
Based on the _________________________________, a mixture can be classified as a solution, a suspension, or a colloid.
a. shape of its particles
Selected: b. size of its largest particlesThis answer is correct.
c. size of its smallest particles
d. color of its particles
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Question 5
Which of the following is a mixture?
a. silicon dioxide
b. water
Selected: c. sandThis answer is correct.
d. silicon
e. carbon dioxide
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Question 6
What are the two categories of pure substances?
a. solutions and suspensions
b. solutions and colloids
c. elements and colloids
d. compounds and colloids
Selected: e. elements and compoundsThis answer is correct.
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Question 7
If a pure substance contains three elements joined in a fixed proportion, it is a(n) ________________.
Selected: a. compoundThis answer is correct.
b. atom
c. suspension
d. mixture
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Question 8
The properties of a mixture _______________________.
a. cannot vary because the composition is fixed
b. can vary because the composition is always exactly the same
c. cannot vary because the composition is not fixed
Selected: d. can vary because the composition is not fixedThis answer is correct.
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Question 9
What type of mixture forms when a small amount of sugar totally dissolves in hot water?
a. solution
Selected: b. colloidThis answer is incorrect.
c. compound
d. suspension
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Question 10
Elements ___________________________.
a. can be broken down into simpler substances and contain only one type of atom
b. cannot be broken down into simpler substances and contain only one type of atom
c. can be broken down into simpler substances and contain more than one type of atom
Selected: d. cannot be broken down into simpler substances and contain more than one type of atomThis answer is incorrect.
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Question 11
Water is a compound because it ____________________.
Selected: a. can be broken down into simpler substances AND it always has the fixed proportion of two hydrogen atoms for each oxygen atomThis answer is correct.
b. cannot be broken down into simpler substances and it always has the fixed proportion of two hydrogen atoms for each oxygen atom
c. can be broken down into simpler substances AND it always has the fixed proportion of five hydrogen atoms for three oxygen atoms
d. cannot be broken down into simpler substances and it always has the fixed proportion of one hydrogen atom for two oxygen atoms
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Question 12
An evenly distributed mixture where it is difficult to distinguish one substance from another is a(n) _________________.
a. element
Selected: b. homogeneous mixtureThis answer is correct.
c. compound
d. heterogeneous mixture
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Question 13
Which of the following mixtures is a heterogenous mixture?
Selected: a. a pile of mixed nutsThis answer is correct.
b. air
c. dilute sugar water
d. stainless steel
e. swimming pool water (water and chlorine)
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Question 14
A substance that is made up of only one kind of atom is a(n) ______________________.
a. colloid
b. compound
Selected: c. elementThis answer is correct.
d. solution
e. homogeneous mixture
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Question 15
Which of the following are pure substances?
a. solutions
b. mixtures
c. suspensions
d. colloids
Selected: e. compoundsThis answer is correct.
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Question 16
What is the symbol for aluminum?
Selected: a. AlThis answer is correct.
b. AL
c. A
d. Au