WorksheetsCHEM Lab
Total questions: 36
Worksheet time: 18mins
The number 0.00442 would be written in scientific notation as:
0.442 x 10^{-4}
4.42x10−3
442 x 10
4.42 x 10^3
How many significant figures are there in the number 1.060?
1
2
3
4
Convert 1.2 mg to kilograms.
1.2 x 10^{-6} Kg
1.2 x 10^{-5} kg
1200 g
12000 g
Gold is an example of a _______.
Molecule
Element
Compound
Covalent bond
If the atomic mass of an element is 12 and the atomic number is 6, how many neutrons are in the atom of this element?
12
6
18
2
Magnesium (Mg) is located to the right of sodium (Na) because Mg has fewer
protons
no protons.
no neutrons
more protons.
How many electrons are present in the outer most shell of an Argon gas?
6
8
2
18
Which element has the chemical symbol Hg and is used in light bulbs?
Mercury
Copper
Tungsten
Which would you use to find the volume of an irregularly shaped rock?
(length) x (width) x (height)
Water displacement method
Direct measurement
A triple beam balance
Determine the volume of the liquid in the cylinder.
12.5 mL
12.0 mL
12 mL
12.50 mL
90 mL of salt water has a mass of 120 g. What is the density of the salt water in g/mL?
75 kg/L
1.3 kg/L
3.0 kg/L
9.0 kg/L
What is the volume of this cube?
9 cm²
12 cm³
24 cm³
36 cm³
A rock is dropped into a graduated cylinder containing 45 mL of water. The new volume is 47 mL. What is the mass of the rock, if density of water is 1.0 g/mL?
4 g
2 g
47 g
87 g
If 100.0 J of energy is added to a 50.0 g of Cu, what will be the change in temperature (ΔT)? (specific heat capacity = 0.382 J/°C.g)
30.2 °C
5.23 °C
7.2 °C
19.8 °C
Alkali metals belong to a group I of elements in periodic table, which of these is an atom of an alkali metal?
A.
B.
C.
D.
What is the volume of a solution whose concentration is 0.2 mol/L if it contains 49 g of H₂SO₄?
2.5 L
5.6 L
7.2 L
How much water is present in a 35 % mass solution if its total mass of the solution is 400 g?
260 g
670 g
632 g
The correct molecular geometry of CCl₄ is
linear
trigonal planar
tetrahedral
pyramidal
Using the VSEPR model, the molecular geometry of the central atom in BCl3 is __________.
linear
trigonal planar
tetrahedral
bent
Which of the following elements has the most attraction for electrons in a chemical bond?
oxygen
carbon
fluorine
nitrogen
A balloon is filled with 35.0 mL of helium in the morning when the temperature is 20.0 ºC. By noon the temperature has risen to 45.0 ºC. What is the new volume of the balloon?
0.038 L
38.0 L
380 L
How many moles are in 4.3x1022 molecules of H3PO4?
7.1 x 10^{-2} moles H3PO4
3.1 x 10^{-6} moles H3PO4
2.1 x 10^{-2} moles H3PO4
What is the molar mass of (NH4)2SO4?
114.09 g/mole
118.34 g/mole
128.06 g/mole
132.13 g/mole
In an atom with 15 protons and 17 neutrons, the electron number of the element is ______.
30
15
34
64
94
What is the formula of the compound formed between strontium ions and nitrogen ions?
SrN
Sr3N2
Sr2N3
SrN2
What is the correct formula for iron (III) phosphide?
Fe2P3
Fe2P
FeP
Fe3P2
When the following equation is balanced, what is the coefficient of H2O? H2SO4 + Ba(OH)2 → BaSO4 + H2O
2
1
3
Is this reaction endothermic or exothermic? Ca(OH)2 + heat → CaO + H2O
endothermic
exothermic
Consider the hypothetical chemical reaction represented by the equation 3 A + 2 B → A3B2 Which of the following is a correct interpretation of this equation?
3 grams of A react with 2 grams of B to form 1 gram of A3B2
3 moles of A react with 2 moles of B to form 1 mole of A3B2
What is the measure of a tetrahedral bond angle?
90 Degrees
109.5 Degrees
120 Degrees
180 Degrees
Convert 80.0 °C to °F?
176 °F
26.7 °F
353 °F
– 176 °F
– 26.7 °F
Which of the following terms describes how close values are to each other?
Accuracy
Precision
The atomic number of chlorine is 17 and the mass number is 35. How many protons, neutrons and electrons does the chlorine atom contain?
Protons = 17, Neutrons = 18, Electrons = 17
Protons = 17, Neutrons = 35, Electrons = 17
Protons = 17, Neutrons = 17, Electrons = 35
Protons = 17, Neutrons = 17, Electrons = 18
How many valence electrons does phosphorus have?
1
2
5
15
19
What is the charge on the iron cation in the compound FeCl3?
No charge
1+
2+
3+
3-
If 0.05 moles of salicylic acid are used in the esterification reaction, how many moles of oil of wintergreen can be produced?
0.05 moles
0.10 moles
1 mole
6.02x1023
3.01 x 10^2 moles
