Chemistry 210 - Quiz 1
What is the correct IUPAC name for Sr₃N₂?
strontium nitride
The number 4.0 × 10⁵ has ___ significant figures.
2
How many oxygen atoms are in 21 molecules of tetraphosphorus decoxide (also known as phosphorus pentoxide), P₄O₁₀?
210 .One molecule of tetraphosphorus decoxide contains ten oxygen atoms. Multiply this by the number of molecules to find the number of oxygen atoms. For example, 21 molecules of tetraphosphorus decoxide contain 210 oxygen atoms.
The number 8.07 × 10⁻³ has ___ significant figures.
3
The number 875000 written in scientific notation would be
8.75 × 10⁵
Fahrenheit to Celsius:
C = (F - 32)/1.80
Kelvin to Celcius
C = K - 273 (C = K - 273.15 if you want to be more precise)
A white powder mixture is placed into water. Some of the powder sinks to the bottom of the container, some rises to the top. The separation of the powder mixture is an example of A) a chemical change B) a chemical reaction C) a physical change D) an extensive property
C) a physical change
The process of filtration is example of A) a chemical change B) a chemical reaction C) a physical change D) an intensive property
C) a physical change
Why is the dissolving of sugar in water a physical change? A) the chemical composition of the sugar changes B) the water gets sweeter C) the sugar changes from the solid state to the aqueous state D) the water surrounds the sugar molecules
C) the sugar changes from the solid state to the aqueous state
Write the balanced molecular chemical equation for the reaction in aqueous solution for cesium carbonate and magnesium nitrate. If no reaction occurs, write NR.
Cs₂CO₃(aq) + Mg(NO₃)₂(aq) → MgCO₃(s) + 2 CsNO₃(aq
Which of the following is an example of an extensive property of copper nugget? A) It is copper colored. B) It has a density of 8.96 g/cm³. C) It has a melting point of 1085 °C. D) It has a mass of 52.3 g.
D. It has a mass of 52.3 g.
Celsius to Fahrenheit:
F = 9/5(C) + 32 or F = 1.80(C) + 32
Which of the following states of matter is pictured below?
Gas
Elements that are most similar in their properties are found _____
Group
Which of the following is an exampleof scientific law:
In a chemical reaction, matter is neither created or destroyed.
A set of data was collected measuring the length of a sheet of steel using three different instruments. The actual length of the sheet is 1.32 m. Which instrument is the most precise in its measurements?
Instrument #3. Because instrument 3 measures more accurately than other instruments.
Which of the following is an intensive property of a sample of neon gas?
Its temperature
Which of the following is a step that is NOT in the scientific method?
Modifying laws
Which of the following temperatures is the coldest?
Note that 100 °F = 37.8 °C, which is equivalent 311 K. This is not the coldest temperature of the three choices
A chemical change:
Occurs when methane gas us burnedd
Complete the balanced molecular chemical equation for the reaction below. If no reaction occurs, write NR after the reaction arrow. Pb(NO3)2(aq) + KI(aq) →
Pb(NO₃)₂(aq) + 2 KI(aq) → PbI₂(s) + 2 KNO₃(aq)
What is the correct IUPAC name for KF?
Potassium
Which of the following states of matter is pictured below?
Solid
Three students measure the volume of a liquid using a graduated cylinder. In a separate experiment, the actual value volume of the liquid is 152 mL. Which set of data is the most accurate?
Student 3
What is the correct IUPAC name for CrN?
chromium (III) nitride
What is the correct IUPAC name for Cu₂S?
copper(I) sulfide
What is the correct IUPAC name for NiS?
nickel (II) sulfide
What is the correct IUPAC name for SnS₂?
tin (IV) sulfide
Molecules can be described as
two or more atoms chemically joined together.
The uncertainty in the measurement 0.0035 mg is: (Note: The last significant digit of a measurement is uncertain and its place value is used in the uncertainty.)
± 0.0001 mg
How many hydrogen atoms are in 27 molecules of diborane, B₂H₆?
162 One molecule of diborane contains six hydrogen atoms. Multiply this by the number of molecules to find the number of hydrogen atoms. For example, 27 molecules of diborane contain 162 hydrogen atoms.
What is the coefficient in front of the O₂ when the equation below is balanced (using only whole numbers and the lowest whole number ratio)? C₂H₄O₂(g) + O₂ (g) → CO₂(g) + H₂O (g)
2 Matter is conserved in a chemical reaction. Balanced equations contain the same number of atoms of each element on each side of the equation. For example, in the following balanced equation C₂H₄ (g) + 3 O₂ (g) → 2 CO₂(g) + 2 H₂O (g), there are 2 C atoms, 4 H atoms, and 6 O atoms on the reactant side. There are 2 C atoms, 6 O atoms, and 4 H atoms on the product side. These numbers are equal on both sides.
A thermometer reads 24.9 °C. What is the temperature in Kelvin?
298.1 K. (K=°C+273.15)
Express the number 554,780,000,040 in scientific notation to three significant figures.
5.55 × 10¹¹
The number 0.005925 correctly expressed in scientific notation is:
5.925 × 10^3
While traveling in Europe, you see a weather forecast of 24.8°C. What is this temperature in °F?
76.6 °F
Balance the following chemical reaction: Al₂(SO₄)₃ (aq) + K₃PO₄ (aq) → AlPO₄ (s) + K₂SO₄ (aq)
Al2(SO4)3 + 2K3PO4 → 2AlPO4 + 3K2SO4
Which one of the following would be a physical property of glucose? A) It is used by the body to generate energy. B) When combined with sulfuric acid it forms carbon. C) In its pure form, it is a white powder. D) It can be fermented to form ethanol.
C) In its pure form, it is a white powder.
In which direction on the periodic table does metallic character increase?
Down to the left. Metallic character increases down and to the left of the periodic table.
Write the chemical formula for mercury(I) sulfide
Hg₂S
hich of the following is an extensive property of the element carbon?
The mass of a carbon sample
Which of the following represents an exact quantity?
There are 2.54 cm in an inch
What is the correct IUPAC name for KF?
potassium fluoride
You measured the mass of a dry powder on a balance to be 23.76 g. What would you report as the uncertainty of this measurement?
± 0.01
The uncertainty in the measurement 206300 m is
± 100 m
The law of conservation of mass is best described as which of the following statements?
Matter can neither be created nor destroyed.
Which of the following groups of elements tend to form cations?
Metals
Which one of the following is an example of a heterogenous mixture? A) coffee B) water C) sand D) tap water
Sand
Which of the following describes a chemical change involving water? A) H₂O(l) → H₂O(s) B) H₂O(s) → H₂O(g) C) H₂O(l) → H₂(g) + ½O₂(g) D) H₂O(g) → H₂O(l)
C) H₂O(l) → H₂(g) + ½O₂(g)
Write the balanced molecular chemical equation for the reaction in aqueous solution for ammonium perchlorate and aluminum nitrate. If no reaction occurs, write NR.
NR
Complete the balanced molecular chemical equation for the reaction below. If no reaction occurs, write NR after the reaction arrow. KBr(aq) + CaI₂(aq) → NR
NR. KI and CaBr2 - Both of these solutions are highly soluble in water
Which one of the following would form a precipitate when mixed with aqueous Ba(NO₃)₂?
Na2SO4 When sodium sulfate, Na₂SO₄, is mixed with barium nitrate, Ba(NO₃)₂, in aqueous solution the precipitate barium sulfate, BaSO₄, is formed. Although sulfates are typically soluble in water, BaSO₄ is an exception and therefore insoluble in water. Ba(NO₃)₂(aq) + Na₂SO₄(aq) → BaSO₄(s) + 2NaNO₃(aq)
Write the chemical formula for sodium hydride
NaH
Write the chemical formula for nickel(II) nitrite
Ni(NO₂)₂
Which one of the following is an example of an element? A) brass B) nickel C) bronze D) sterling silver
Nickel
Scientific Method
a method of procedure that has characterized natural science since the 17th century, consisting in systematic observation, measurement, and experiment, and the formulation, testing, and modification of hypotheses.
What is the correct IUPAC name for MgO?
magnesium oxide
What is the correct IUPAC name for Mg₃P₂?
magnesium phosphide
What is the correct IUPAC name for K20?
potassium oxide
A thermometer reads 155.9 K. What is the temperature in °C?
-117.3 °C
How many carbon atoms are in 19 molecules of benzene, C₆H₆?
114. One molecule of benzene contains six carbon atoms. Multiply this by the number of molecules to find the number of carbon atoms. For example, 19 molecules of benzene contain 114 carbon atoms.
Convert 15.0 milligrams to kilograms.
15x10^6 kg
What numbers belong in the blank spaces to fully balance the following reaction? __Fe (s) + __Cl₂ (g) → __FeCl₃ (s)
2Fe+3Cl2 => 2FeCl3 Matter is conserved in a chemical reaction. Balanced equations contain the same number of atoms of each element on each side of the equation. A coefficient of 2 in front of Fe, a coefficient of 3 in front of Cl₂, and a coefficient of 2 in front of FeCl₃ yield the same number of Fe and Cl atoms on both sides of the equation.
Which of the following numbers contains four significant figures?
3.101
The number 6.040 has ___ significant figures.
4
Of the following, which sublevel is filled last?
4D - According to the Aufbau principle, the order in which atomic orbitals are filled is as follows: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, ... Of the options given, the 4d orbital is at the highest energy, and therefore it will be filled with electrons last.
How many significant figures does the number 23.070 have?
5
The number 917.00 has ___ significant figures.
5
You are working to earn enough money for a vacation which costs 3900. Your take-home pay is $16.50/hour, but you only work 4-hour shifts each day. How many days will it take for you to earn enough money to pay for your vacation if all the money you earn goes towards your vacation?
59 days
A thermometer reads 19.1 °C. What is the temperature in Fahrenheit?
66.38 °F or 66.4°F
The number 98000 written in scientific notation would be
9.8 × 10⁴
The following picture would be best described as
A liquid compound
A theory is another word for a
A model
What is the definition of a scientific theory?
A model that explains the underlying reasons for observations and laws
Which of the following is an example of an intensive property of a bar gold? A) The bar has a density of 19.2 g/mL. B) The mass of the bar is 11.4 kg. C) The volume of the bar is 218 L. D) The bar contains 3.49 × 10²⁵ atoms.
A) The bar has a density of 19.2 g/mL.
Why is the dissolving of salt in water a chemical change? A) the salt dissociates into ions B) the water gets saltier C) the water surrounds the salt compound D) the salt molecule does not dissociate into ions
A) the salt dissociates into ions
Write the chemical formula for silver chloride
AgCl
Which of the following hypotheses is testable by using the scientific method?
All swans are white.
What is the correct IUPAC name for AlBr₃?
Aluminum Bromide
What is the correct IUPAC name for Cs₃P? cesium phosphide
Cesium Phosphide
Which of the following is a pure substance that cannot be broken down into simpler substances by chemical means?
Chemical Element
Which one of the following is an example of a homogenous mixture? A) coffee B) salt C) concrete D) iron
Coffee
Kelvin to Fahrenheit:
F = 9/5(K - 273) + 32 or F = 1.8(K - 273) + 32
The precipitate formed when Fe(NO₃)₃ is mixed with KOH is
Fe(OH)₃ The products of this reaction are iron(III) hydroxide and potassium nitrate. Potassium nitrate is soluble in water. Iron(III) hydroxide is insoluble in water and its chemical formula is Fe(OH)₃.
What element is theoretically the largest of all on the periodic table?
Francium (Fr) Atomic radius increases as you move down the periodic table and to the left. Francium is the furthest down and to the left of this group and would be predicted to to be the largest element of the whole periodic table.
Under which process does an atom demonstrate the largest increase in size in one step?
Gaining its first electron to become a -1 anion. Anions are larger than the neutral atom from which they derived. Generally the change in size is greatest when an atom gains/loses its first electron. Subsequent changes in overall charge lead to smaller changes.
The accepted value for the density of iron is 7.9 g/mL. Which of the following sets of experimental data for the density of iron is the most precise?
Group 2: 7.65 g/mL, 7.64 g/mL
What quantum mechanics principle states that electrons are added to atomic orbitals with the same energy so that each orbital is singularly occupied with electrons having the same spin?
Hund's rule states that electrons are added to the atomic orbitals with the same energy levels (degenerate orbitals) in such a way that each orbital is occupied by a single electron with the same spin (either +½ or -½) before any orbital can be occupied by two electrons.
Which periodic trend quantifies the amount of energy required to remove an electron from a neutral, gaseous atom?
Ionization energy is the amount of energy required to remove an electron from a neutral, gaseous atom.
Fahrenheit to Kelvin:
K = 5/9(F - 32) + 273.15
Celsius to Kelvin:
K = C + 273 (or K = C + 271.15 to be more precise)
What is the noble gas core in the electron configuration for Sb?
Kr - The noble gas core for a given element is the last noble gas filled in the periodic table prior to the given element. Here, the last noble gas prior to Sb is Kr, so that is its noble gas core.