Chemistry Semester Final
Which element naturally occurs in a diatomic molecule?
(H) Hydrogen
Calcium carbonate was placed in a flask on a balance, and dilute hydrochloric acid was added. Carbon dioxide that was produced escaped from the flask. The total mass of the flask and its contents was recovered every 10 seconds. The diagram above shows a plot of the results. Between which of the following times was the reaction the fastest?
0 & 10 seconds
How many liters are equivalent to 5 milliliters?
0.005L
Which of the following above elements is a positive ion with a charge of 1? elements protons neutrons electrons 1 12 11 10 2 1 0 2 3 15 16 15 4 20 20 18
1
Which represents an atom of calcium? element protons neutrons electrons 1 20 20 20 2 40 40 40 3 20 10 10 4 20 20 40
1
Elements from which 2 groups in the periodic table would most likely combine with each other ti form an ionic bond?
1 & 17
Give the correct charge: 6p + 7n + 6e =
1(-)
A scientist has found many of the following isotopes of oxygen: How many neutrons are present in this isotope? 19 O 8
11
How many protons, neutrons, and electrons in a neutral atom of sodium?
11 protons, 12 neutrons, 11 electrons
The net charge on an aluminum ion is +3 because there are...
13 protons and 10 electrons in the atom
A neutral atom of aluminum-27 contains how many protons, neutrons, and electrons?
13 protons, 14 neutrons, 13 electrons
Which set of coefficients will balance this equation? ?Al + ?HCl + ?AlCl3 + ?H2
2, 6, 2, 3
How many grams of sodium chloride are required to prepare 500.0 mL of a 0.100 M solution?
2.93g
The volume of object X is approximately... Original Fluid level = 70mL Final fluid level = 95mL
25mL
How should 0.000365 be expressed in proper scientific notation?
3.65 x 10⁻⁴
A student used the above ruler to measure the length of a nail. The length of this nail, according to the precision the ruler, is...
3.75cm
How many valence electrons does a neutral atom of Silicon have?
4
When the above equation is balanced, the coefficient of the hydrochloric acid will be... Al + HCl --> AlCl3 + H2
6
Which pair of solutions would be acidic if mixed in equal quantities? Solution pH A 2 B 6 C 9 D 12
A & B
Ulcers are often caused by an excess of stomach acid. Milk of magnesia is often used to soothe the irritation. Milk of magnesia is probably a...
A base
Charles' Law states that if a given quantity of gas is held at constant pressure, then its volume is directly proportional to the absolute temperature. This law explains why...
A gas filled balloon expands when it is heated
What us an example of a mixture?
Air
An alien astronaut landed on Earth and created the periodic table shown below. The astronaut was trying to determine what type of bond would present in several compounds. The type of bond in a compound containing G and E would be...
An ionic bond
What is the correct Lewis Dot Structure for Arsenic?
As
The smallest part of an element or molecule. Building block of all things.
Atoms
What is the main similarity among elements in group 2?
Chemical properties
A balanced chemical equation has equal numbers of atoms of each type on both sides of the equation. Thus illustrates the principle of...
Conservation of mass
Atoms of the same element must...
Contain the same number of protons
The correct formula for copper(1) bromide is...
CuBr
Methyl mercury, found in some stream sediments, is highly toxic to animal life. Using the graphed results of the study shown, the best analysis of the data reveals that the methyl mercury concentration in the stream sediment is...
Decreasing but reaches a maximum o=at the end of summer
The correct name for P2O5
Diphosphate Pentoxide
A substance in which all of the atoms are the same...
Element
Negative particles in orbits around the atom...
Eletrons
If a lab group were using hydrochloric acid to perform a substitution reaction, which precaution would not be a concern?
Flammability
The energy required to melt a solid into a liquid is called...
Heat of Fusion
Which is the base in the reaction? H2SO4 + KOH <---> H2O + K(+) + HSO4(-)
KOH
The following data was collected. The volume of the gas is known to be 2.20L Trial Measured volume (L) 1 5.20 2 5.20 3 5.19 4 5.20 5 5.20 This data reflects...
Low accuracy and high precision
Which formula is used to determine the half-life of a radioactive element?
M(f) = M(i).(0.5)
Between points 2 and 3(freezing and melting), energy is being used to...
Melt ice
The formula for dinitrogen tetroxide?
N2O4
Which of these elements contain 4 valence electrons?
Na3BrO3
Give the correct charge: 6p + 5n +7e =
Neutral
Center of the atom; contains protons and neutrons...
Nucleus
Ions of an element have different...
Numbers of electrons
Which completes the following equation? 203(g)(^R)3___
O2
In chemical compounds, covalent bonds form when....
Pairs of electrons are shared between 2 nonmetal atoms
The atomic number corresponds to an atom's number of...
Protons
Each balloon was filled with an identical number of moles gas. Which of the following best explains why balloon B is larger than balloon A?
The gas in balloon B is warmer.
