Which of the following is a pure substance?

Chemistry Concepts and Principles

Interactive Video
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Chemistry
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9th - 10th Grade
•
Hard

Patricia Brown
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10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Saltwater
Air
Gold
Sand
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the role of a control variable in an experiment?
To change the outcome
To be measured
To be manipulated
To remain constant
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do you convert Celsius to Kelvin?
Add 273.15
Divide by 273.15
Multiply by 273.15
Subtract 273.15
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the formula for calculating percent error?
(Theoretical Value - Experimental Value) / Theoretical Value x 100
(Experimental Value + Theoretical Value) / 2 x 100
(Theoretical Value + Experimental Value) / 2 x 100
(Experimental Value - Theoretical Value) / Theoretical Value x 100
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which subatomic particle determines the atomic number of an element?
Proton
Electron
Nucleus
Neutron
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the electron configuration for an element with atomic number 10?
1s² 2s² 2p⁶
1s² 2s² 2p⁴
1s² 2s² 2p⁵
1s² 2s² 2p²
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is a polyatomic ion?
Cl⁻
Na⁺
O²⁻
SO₄²⁻
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