WorksheetsCHEM Lab Assessment
Total questions: 34
Worksheet time: 36mins
8 cm
0 cm
7 cm
1 cm
Based on the photo, what is the volume of the liquid?
35 mL
24 mL
25 mL
30 mL
Q1. To determine the density of iron, a student immersed a sample of iron in 45.5 mL of water in a graduated cylinder, causing the level of the water to rise to 49.0 mL. If the iron had a mass of 31.5 grams, what is the density of iron?
127.4 g/ cm3
9.00 g/ cm3
37 g/ cm3
8.2 g/ cm3
Identify the reactants and products in the following chemical equation: Fe + O2 -> Fe2O3
Fe2O3 and O2 are the reactants, and Fe is the product.
Fe2O3 and Fe are the reactants, and O2 is the product.
Fe and O2 are the reactants, and Fe2O3 is the product.
Fe2O3 and Fe are the products, and O2 is the reactant.
Balance the chemical equation: Ca(OH)2 + H3PO4 -> Ca3(PO4)2 + H2O
3Ca(OH)2 + 2H3PO4 -> Ca3(PO4)2 + 6H2O
Ca(OH)2 + H3PO4 -> Ca3(PO4)2 + 2H2O
2Ca(OH)2 + H3PO4 -> Ca3(PO4)2 + 3H2O
3Ca(OH)2 + 2H3PO4 -> Ca3(PO4)2 + 4H2O
CH4 + 2H2O → CO2 + 4H2
What is the limiting reactant when 2g CH4 react with 15g H2O?
CH4
H2O
CO2
H2
Actual yield = 62g
Calculate the percent yield.
How many significant figures are in 0.68010?
6
5
4
answer not given
What is the correct Lewis Dot Structure for ammonia NH3
What is a valence electron?
electron found in a middle shell
electron found in outermost shell
electron found in innermost shell
electron not found in a shell
What is the VSEPR theory and how does it help determine molecular geometry?
The VSEPR theory is a model used in chemistry to predict the boiling point of molecules by considering the repulsion between electron pairs in the valence shell of an atom.
The VSEPR theory is a model used in chemistry to predict the size of molecules by considering the repulsion between electron pairs in the valence shell of an atom.
The VSEPR theory is a model used in chemistry to predict the color of molecules by considering the repulsion between electron pairs in the valence shell of an atom.
The VSEPR theory is a model used in chemistry to predict the shape of molecules by considering the repulsion between electron pairs in the valence shell of an atom.
beryllium iodide
A charged atom is called
ion
cation
anion
neutral
What is the correct name for this compound?
fluorine chlorine
iron chloride
iron(II) chloride
iron(I) chloride
When Ca2+ combines with N3- the resultant formula would be
CaN
Ca2N3
Ca3N2
Ca6N4
What is the correct formula for the compound dinitrogen pentoxide?
N2O3
NO2
N3O7
N2O5
The reaction A + B ⟶ AB is classified as a _____ reaction.
synthesis
decomposition
single replacment
double replacement
The reaction XY ⟶ X + Y is an example of _____.
synthesis
decomposition
single replacement
double replacement
What class of reaction best describes the equation below?
FeS + HCl ⟶ H2S + FeCl2
synthesis
combustion
single replacement
double replacement
What class of reaction best describes the equation below?
CH4 + O2 ⟶ CO2 + H2O
single replacement
double replacement
decomposition
combustion
What class of reaction best describes the reaction
Mg + HCl ⟶ MgCl2 + H2
combustion
synthesis
decomposition
single replacement
What is this?
graduated cylinder
flask
test tube
beaker
What is this?
metric ruler
Celsius thermometer
graduated cylinders
pan balances
What is this?
Pipette
Eye dropper
Tweezers
Forceps
What is this?
hot plate
electronic balance
bunsen burner
scales
What is this?
A Beaker
An Erlenmeyer Flask
A Test Tube
A Vial
Which is the correct temperature for this thermometer?
70.5 oC
70.49 oC
74.9 oC
76.9 oC
Which is the correct temperature for this thermometer?
58.4 oC
57.4 oC
50.74 oC
57 oC
What is the density (g/mL) of a sample of mineral oil if 250 mL has a mass of 230 g?
0.92 g/mL
1.00 g/mL
0.85 g/mL
1.10 g/mL
