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To Balance Or Not To Balance
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Guaca-MOLE
Dexter's Lab
100
How many oxygen atoms do I have in the following compound? Al(OH)3
3
100
What is the prefix for 5?
Penta
100
What does the atomic number tell you about an element? (2 answers)
Number of protons or electrons
100
Avogradro's number is:
6.02 x 10^23
100
Why should you always wash glassware (beakers, flasks, graduated cylinders, etc) before using them in the lab?
Remove contamination and chemical residue!
200
How many calcium atoms are in the following compound? Ca(OH)2
1
200
[NO3]- is called _____
Nitrate
200
The first column of the periodic table are what type of elements? Metal, nonmetal, or metalloid?
Metal
200
What is the unit for molar mass?
g/mol or grams per 1 mole
200
If time permits, why should you always do more than 1 trial in a lab procedure? (2 answers)
1. Create more precise measurements and calculations 2. More reliable data/reproducibility 3. Decrease errors in the procedure
300
Balance the following: P4 + O2 → P2O5
1 5 2
300
The name for P4S10 is:
Tetraphosphorus decasulfide
300
Group 7 elements are nonmetals but are commonly known as:
Halogens
300
1 mole of zinc has how many atoms?
6.02 x 10^23 atoms
300
When dealing with a chemical that is hazardous upon contact, what should be worn at all times? (3 answers)
Goggles, gloves, apron!
400
Balance the following: AgNO3 + K3PO4 → Ag3PO4 + KNO3
3 1 1 3
400
The formula for calcium phosphate is:
Ca3(PO4)2
400
Molybdenum has how many protons?
42
400
What does the "M" stand for in 6M HCl? (2 answers)
Molarity or moles per 1 liter
400
When we're finished with chemicals and solutions that were used in the lab, where should we dispose of them?
Waste container!!
500
Balance the following: C6H6 + O2 → CO2 + H2O
2 15 12 6
500
The name of CCl4 is:
Carbon tetrachloride
500
If a neutral barium atom lost 2 electrons, how many electrons would it have? Charge?
54; 2+
500
When converting from mole of one substance to mole of another substance, what conversion do you use? Where do you get this conversion?
Molar ratio; coefficients of the balanced equation
500
In chemistry, what do you call a compound that formed that does not readily dissolve in water? (2 answers)
Precipitate; insoluble product