WorksheetsChemistry 1 Benchmark
Total questions: 59
Worksheet time: 30mins
Which of the following elements is unlike the other elements, due to its classification on the periodic table?
Nitrogen
Cobalt
Chlorine
Xenon
What atom below would consist of two protons in its nucleus?
Helium
Hydrogen
Lithium
Boron
The goal of alchemists was to transform lead into gold and silver. Why would scientists today view alchemy as false science?
Alchemists were not successful in transforming lead despite many attempts
Modern scientists have attempted the same and still are unable to do so.
Alchemist used incantation and rituals in their experiments
The law of definite proportions states that the number of atoms in lead cannot be changed to make gold.
The term for atoms of the same element that have the same atomic number but different mass numbers.
Ions
Isotopes
Neutrinos
Quarks
Which of the following observations is not an indication that a chemical reaction has taken place
Gas bubbles when powder is added
A solid material becomes liquid when it is heated
Heat is generated when sodium is exposed to water
Water forms when hydrogen burns in the presence of oxygen
What statement below best describes Bohr’s model of the hydrogen atom?
The electron is in circular orbitals (energy levels) around the nucleus
A large, dense nucleus surrounded by atoms in different orbits.
A nucleus surrounded by orbiting neutrons
All the particles are mixed together like plum pudding
What type reaction is show below 2Al + ZnO3 --> Zn + Al2O3
Double replacement
Single replacement
Synthesis
Combustion
In a reaction in which heat is transferred from the system to its surroundings is known as a __________ reaction.
Exothermic
Endothermic
Endoscopic
Endergonic
A student finds that 1.6 grams of CH4 will react with enough oxygen gas to produce 3.6 grams of water and 4.4 grams of carbon dioxide. Find the sum of the coefficients from the balanced chemical equation using the reaction above.
4
5
6
8
The data below shows the density of copper a student finds when doing a laboratory test. She compares this to the actual value in the Handbook of Chemistry and Physics to be 8.96 g/cm³. What was her percent error?
1.5%
98%
98.6%
99%
A student is doing a lab, her stoichiometry comes out to say she should get a yield of 4.20 grams of copper; however, she only got 3.21 grams of copper. What was her percent yield?
76%
76.2%
What is the correct electron configuration for Iron?
1s2,2s2,2p6,3s2,3p6,4s2,3d2
1s2,2s2,2p6,3s2,3p6,4s2,3d3
1s2,2s2,2p6,3s2,3p6,4s2,3d6
1s2,2s2,2p6,3s2,3p6,4s2,3d4
What is the symbol used to determine heat in joules of any reaction?
C
Q
Delta
Omega
Who was the person who arranged the modern periodic table?
Dmitri Mendeleev
J.J. Thompson
Henry Mosely
Aristotle
What was the problem of basing the periodic table by atomic mass?
Didn't fit on the paper
Didn't allow for the kinetic flowing of electrons
Gaps in the elements such as Te, and I
Too difficult to read
All elements are arranged horizontally because
Based on decreasing electronegativity
Have similar chemical behaviors
Have increasing electronegativity as you move left to right
Have the same valence electrons
Which group on the periodic table is most likely to form ionic compounds with the halogens?
Group 2
Group 13
Group 1
Group 4
What aspect of the periodic table BEST indicates the valence electrons present in an atom?
a. Groups
b. Families
What block do the majority of the non-metals fit into?
S block
P block
D block
F block
Which of the following are in the same period as phosphorus?
Carbon
Magnesium
Nitrogen
Oxygen
Which of the following compose most of the elements on the periodic table?
Metals
Non-Metals
Metalloids
Noble Gases
Each period in the periodic table corresponds to a(an) ______
Principle energy level
Energy Sublevel
Orbital
Suborbital
Of the elements Pt, V, Li and Kr which is a non-metal
Pt
V
Li
Kr
What group in the periodic table represents the alkali earth elements?
Group 1
Group 2
Group 3
Group 17
How many valence electrons does Oxygen have?
2
7
6
5
When an ionic element is dissolved in water they break up to form
anions
Ions
Acids
Salts
When a metal and a non-metal combine
The metal donates an electron becoming an anion
The metal donates an electron becoming a cation
The metal accepts an electron becoming an anion
The metal accepts an electron becoming a cation
What is oxidation number of strontium?
8
2-
2+
1+
Electron acceptors are called
Anions
Cations
Oxyanions
Ions
Elements that have more than one atom attached, and form a bonding association, still having a + or - charge are called?
Ions
Cations
Polyatomic Ions
Isomers
Elements that are characterized by filling of p orbitals are classified as _______?
Groups 1,2
Groups 13-18
Transition Elements
Inner transitions
Which of the following is a representative element?
Iron
Copper
Titanium
Aluminum
Iron (II) combines with hydroxide to form?
FeOH
Fe₃O₂
Fe(OH)₂
The cation of calcium and a phosphate anion combine to form?
CaP
Ca3(PO4)2
Ca2(PO4)3
Ca2(PO4)
What ion of Iron is involved to create the compound Fe2O3?
Fe
Fe2-
Fe3+
Fe+
The reaction below would not occur because? gold + lead chloride --> lead + gold chloride
Differences in electronegative forces
They involve pure metals
Gold is a compound
Gold is lower in the activity series than lead
The equation N2 + H2 --> NH3 best fits which type of equation listed below?
Net ionic equation
balanced covalent equation
Skeleton equation
Balanced equation
If a compound is composed of 22.1% Al, 25.4% P and 52.5% O What would be its empirical formula?
AlPO
Al2PO4
AlPO4
Al3PO8
Silver nitrate (aq) reacts with sodium chloride (aq) to produce silver chloride and sodium nitrate. What would be the net ionic equation for this reaction?
Na + NO3 --> NaNO3
Ag + NO3 --> AgNO3
Na+ + Cl- --> NaCl
Ag+ + Cl- --> AgCl
How many atoms are in 22.4 liters of CH3COOH
48.05 Atoms
6.64 x 10^12 Atoms
6.02 x 10^23 Atoms
1.35 x 10^25 Atoms
How many moles of oxygen are produced by the decomposition of six moles of potassium chlorate?
9 moles
6 moles
3 moles
4 mols
What is the mole ratio of the reaction between hydrogen and oxygen combining to form water?
2:2:2
1:2:3
1:2:2
2:1:2
Ten grams of iron and ten grams of oxygen combine to form how many grams of Iron (III) Oxide?
14 g
5.8 g
19 g
19.8 g
Using the following reaction determine the limiting reagent.
10 g of iron and 10 g of oxygen to combine to form iron(III) oxide
Iron
Oxygen
Iron (III) Oxide
All are reacted to completion
The reaction of nitrogen dioxide combining with water forming ammonia (nitrogen trihydride) and oxygen gas requires what set of coefficients to conserve mass?
2,1,3,1
4,6,4,7
2,3,2,2
2,3,2,3
IF the heat of the reactants is greater than the products the reaction is an example of a/an?
Oxidation Reduction reaction
Decomposition reaction
Exothermic reaction
Endothermic reaction
Which reaction would not occur based on the activity of the replacing metal?
Lithium + Magnesium Oxide
Potassium + Calcium Chloride
Fluorine + Calcium Iodide
Manganese + Magnesium Oxide
Refer to the phase diagram. What area on the phase diagram represents a solid becoming a liquid?
A
B
C
D
Refer to the phase diagram. What value would you use to calculate the amount of heat to change a solid to a liquid?
Heat of sublimation
Heat of vaporization
Heat of fusion
Heat of reaction
Refer to the phase diagram. Point F on the heating curve depicts where water reaches the
Triple point
Critical point
Heat of fusion
Heat of vaporization
Determine the experimental specific heat capacity in J/g K of a 0.80 mols of aluminum that was originally heated to a temperature 120.0 C then cooled to 25.00 C with -1941 J of heat was released.
-0.95 J/g K
0.95 J/g K
1.82 J/g K
-1.82 J/g K
How much heat in kilojoules is needed to evaporate 1.4 mols of water into steam? (Hvap water = 40.7 KJ/mol)
-56 kj
56.2 kj
Calculate ΔH for the reaction 2C(s) + 2H2(g) --> C2H4(g), given the following thermochemical equations: Known Heats of Formation 2CO2(g) + 2H2O(l) --> C2H4(g) + 3O2(g) ΔH = 1411 kJ C(s) + O2(g) --> CO2(g) ΔH = -393.5 kJ 2H2(g) + O2(g) --> 2H2O(l) ΔH = -572 kJ
5 KJ
-58 KJ
1938 KJ
52 KJ
Calculate ΔH for the reaction 4NH3 + 5O2 --> 4NO + 6H2O, from the following data. Rounded to the nearest whole number.
-2143 KJ
-755.4 KJ
-1628 KJ
-1995 KJ
Calculate ΔH for the reaction 2Al + 3Cl2 --> 2AlCl3 from the data.
-6584 KJ
-2894 KJ
-3943 KJ
-796 KJ
Alex thinks he has a 50.26 gram cube of iron. In which he heats the cube from 25 C degrees C to 327 degrees C once the cube hits the water in a coffee cup calorimeter containing 125.05 g of water. The temperature in the calorimeter changes from 25 C to 36 C. Determine the experimental heat capacity of this sample and use the specific heat chart to determine this unknown.
Aluminum
Concrete
Iron
Brass
A 75.0 g sample of a metal at room temperature is placed in boiling water until its temperature is 100.0°C. A calorimeter contains 100.00 g of water at a temperature of 24.4°C. The metal sample is removed from the boiling water and immediately placed into the water in the calorimeter. The final temperature of the water is 34.9°C. Assuming that the calorimeter provides perfect insulation, what is the specific heat of the metal?
4.184 J/g C
0.781 J/g C
1.01 J/g C
0.900 J/g C
Find the heat of combustion of ethene (C2H4), given the following information. ΔH C2H4 = +52.3 KJ/mol ΔH CO2 = -393.5 KJ/mol ΔH H2O = -285.8 KJ/mol C2H4 + 3O2 --> 2CO2 + 2H2O
-1,358.6 KJ
+52.300 KJ
-95.674 KJ
-1410.9 KJ
Calculate the ΔH for the following reaction in kilojoules/mol CaCl2(s) + 2H2O(l) --> Ca(OH)2(l) + 2HCl(g)
-195 KJ
-453 KJ
453 KJ
101 KJ
