Chem exam 1
*1. What was Robert Millikan famous for?
Performed the oil drop experiment which determined the charge of the electron. Multiplying the charge by the mass to charge gave the mass of an electron.
1. Express 1.40 x 10-3 L in decimal notation. A. 0.00140 L B. 0.0014 L C. 0.001 L
A. 0.00140 L
1. The prefix kilo- in the metric system represents a factor of _____. (Outcome # 7) (DOK 1) A. 10^3 B. 10^-3 C. 1/10^3
A. 10^3
*1. What is a cation? A. A cation is defined as an atom that has lost electrons and forms a positive charge. B. A cation is defined as an atom that has gained electrons and forms a negative charge. C. A cation is defined as an atom that has gained electrons and forms a positive charge.
A. A cation is defined as an atom that has lost electrons and forms a positive charge.*
1. Which elements are considered noble gases? A. He, Ne, Ar B. H, N, O C. F, Cl, Br
A. He, Ne, Ar*
1. What is the base unit for volume in the metric system? A. L B. mL C. dL
A. L*
*1. What is the best approach towards performing experiments to test a hypothesis? A. Perform more than 1 trial varying only one variable in each trial B. Perform more than 1 trial varying more than one variable in each trial C. Perform only 1 trial varying only one variable D. a botanist adds 20 mL of water to his plants on a daily basis and he notices a healthy growth, therefore, adding 40 mL of water on a daily basis will definitely enhance their growth further
A. Perform more than 1 trial varying only one variable in each trial*
*1. Which statement is correct about chlorine-35 and chlorine-37? A. They have the same number of protons and electrons, but a different number of neutrons. B. They have a different number of protons and electrons, but the same number of neutrons. C. They have the same number of protons, but a different number of electrons and neutrons.
A. They have the same number of protons and electrons, but a different number of neutrons.*
1. Which of the following would be a good example of an observation in the scientific method process? (Outcome # 10) (DOK 2) (Paired item 1) A. a physician observing a patient's reaction to some medication B. a physician observing his watch C. a physician speaking with and observing a patient in an examination room
A. a physician observing a patient's reaction to some medication*
*1. Which of the following would be a good example of a hypothesis in the scientific method process? A. a researcher considers that the more sunlight a green plant receives, the larger the plant will grow B. a researcher wonders amount the effect of more sunlight on green plant growth C. a researcher watches as a green plant exposed to more sunlight grows over a period of 1 month
A. a researcher considers that the more sunlight a green plant receives, the larger the plant will grow*
Which of the following is an example of applied research? A. a researcher tries to develop a new anti-cancer drug B. a researcher tries to extract a newly found natural product from plants to study its medicinal properties C. a researcher studies a hormone and its prospect as a cell signaling molecule
A. a researcher tries to develop a new anti-cancer drug*
*1. Which of the following would be considered a chemical change? A. a rusting nail B. melting ice C. crushing an aluminum can
A. a rusting nail*
1. Which statement is correct about the scientific method process? A. after testing a hypothesis, a conclusion can be drawn on whether it will be accepted or rejected B. after testing an observation, a conclusion can be drawn on whether it will be accepted or rejected C. after testing a conclusion, it can be predicted whether a hypothesis will be accepted or rejected
A. after testing a hypothesis, a conclusion can be drawn on whether it will be accepted or rejected
1. What can be used to measure the mass of an object? (Outcome # 10) (DOK 1) A. balance B. tape measure C. caliper
A. balance*
1. Which of the following would be a good tool for making scientific observations after isolating a solid product from a chemical reaction? (Outcome # 10) (DOK 2) A. balance B. clock C. tape measure
A. balance*
1. Why has Galileo been called the father of modern science? A. because he made observations and conducted experiments B. because he discovered electrochemical cells C. because he was a philosopher
A. because he made observations and conducted experiments*
1. Within the nucleus, the positive charge is __________. A. concentrated in the center of an atom B. spread evenly throughout an atom C. concentrated at multiple sites in an atom
A. concentrated in the center of an atom*
*1. A salt water solution is classified as what type of matter? A. homogeneous mixture B. heterogeneous mixture C. pure substance
A. homogeneous mixture*
1. What is applied research? A. it deals primarily with solving practical real-world problems B. it deals primarily with solving practical laboratory problems C. it deals primarily with the fundamentals of science that may result in future applications
A. it deals primarily with solving practical real-world problems
1. What is the SI unit for mass? (Outcome # 7) (DOK 1) A. kilogram B. gram C. milligram
A. kilogram
*1. Structural isomers are considered molecules with the same ____________. A. kinds and number of atoms but a different arrangement of these atoms B. number of electrons and protons but a different number of neutrons C. molecular formula but with a different overall charge
A. kinds and number of atoms but a different arrangement of these atoms
*1. The fact that LiBr is 7.99 % lithium and 92.01 % bromine by mass regardless of its origin is an example of _____. A. law of definite proportions B. law of conservation of mass C. Dalton's atomic theory A. How many neutrons are in carbon-12? (6* B. 7 C. 8
A. law of definite proportions*
1. What is the base unit for length in the metric system? A. m B. km C. mm
A. m
*1. In mass spectrometry, species are separated based off their _____? A. mass-to-charge ratio B. mass C. charge
A. mass-to-charge ratio*
1. What is the SI unit for length? (Outcome # 7) (DOK 1) A. meter B. kilometer C. millimeter
A. meter
1. List the basic steps of the scientific method process in the order they must be carried out. (Outcome # 10) (DOK 1) A. observation, hypothesis, prediction, experimentation, and conclusion B. hypothesis, observation, prediction, experimentation, and conclusion C. prediction, observation, hypothesis, experimentation, and conclusion
A. observation, hypothesis, prediction, experimentation, and conclusion*
*1. An explanation for the collection of observations is considered a _____. A. theory B. law C. hypothesis
A. theory*
*1. Which is of the following is an example of a physical property? A. water freezes at 273.15 K B. carbon monoxide is poisonous C. an iron nail rusts
A. water freezes at 273.15 K*
*1. What did J. J. Thomson discover?
All cathode rays emit negatively charged particles that are around 1800 times smaller than an atom. He calculated the mass to charge ratio of these charged particles, which were later named electrons
*1. Give an example of a substance that exists in nature as a single atom:
All the nobel gases (He, Ne, Ar, Kr, Xe...)
*Substance with two or more different atoms that is a molecule and compound
Any substance with two or more not metals (H2O, CO2,)
1. An experimental mouse weighs about 4.41 x 10-2 lbs. What would the weight be in the SI unit for mass? A. 20.0 g B. 0.0200 kg C. 20,003 mg
B. 0.0200 kg*
1. How many grams of iron are in 350 mg of iron? (Outcome # 7) (DOK 1) A. 3.50 g B. 0.350 g C. 35.0 g
B. 0.350 g
1. The prefix milli- in the metric system represents a factor of _____. (Outcome # 7) (DOK 1) A. 10^3 B. 10^-3 C. 1/10^-3
B. 10-3
1. Using the periodic table, what is the atomic number of argon? (Outcome # 1,9) (DOK 2) A. 26.98 B. 13 C. 18
B. 13*
*1. How many neutrons are in chlorine-37? A. 18 B. 20 C. 18.5
B. 20*
*1. What is an anion? A. An anion is defined as an atom that has lost electrons and forms a negative charge. B. An anion is defined as an atom that has gained electrons and forms a negative charge. C. An anion is defined as an atom that has gained electrons and forms a positive charge.
B. An anion is defined as an atom that has gained electrons and forms a negative charge.*
1. Which of the following is an example of applied research? A. a researcher tries to extract a newly found natural product from plants to study its medicinal properties B. a researcher tries to study the effect of a new drug on HIV-inhibition A. a researcher studies a hormone and its prospect as a cell signaling molecule
B. a researcher tries to study the effect of a new drug on HIV-inhibition
*1. Which of the following would be a good example of an observation in the scientific method process? A. a researcher watching a chemical reaction B. a researcher watching a chemical reaction and noting color and temperature changes C. a researcher setting up a chemical reaction in a flask and allowing it to stir for 2 hours
B. a researcher watching a chemical reaction and noting color and temperature changes*
*1. Which is of the following is an example of a physical property? A. carbon monoxide is poisonous B. acids are sour and bases are bitter C. an iron nail rusts
B. acids are sour and bases are bitter*
1. Which of the following is not a correct element name-symbol combination? A. copper, Cu B. arsenic, Ar C. gold, Au
B. arsenic, Ar*
1. Which of the following is not a correct element name-symbol combination? DOK 1 A. copper, Cu B. arsenic, Ar C. gold, Au
B. arsenic, Ar*
*1. The Greek philosopher Democritus phrased what word for a tiny piece of matter that cannot be divided? A. element B. atom C. electron
B. atom*
*1. To calculate the number of neutrons in an atom, you would subtract A. mass number from atomic number B. atomic number from mass number C. atomic number from electron number
B. atomic number from mass number*
1. Why is chemistry considered a central science? A. because it is a core course required for most majors in college B. because it is the fundamental science for many other disciplines C. because it is very important in medicine
B. because it is the fundamental science for many other disciplines
*1. The following is an example of a chemical change. A. cutting paper B. burning paper C. folding paper
B. burning paper
*1. Which is of the following is an example of a chemical property? A. water boils at 100 °C B. carbon monoxide is poisonous C. a copper penny weighs 3.00 g
B. carbon monoxide is poisonous*
1. The following is an example of a chemical change. A. shredding paper B. decomposing waste C. dissolving sugar
B. decomposing waste
1. Once a hypothesis has been established, it can be tested by conducting an _____. A. observation B. experiment C. analysis
B. experiment*
1. What is the base unit for mass in the metric system? A. kg B. g C. mg
B. g
1. Chlorine gas is considered a _____? A. noble gas B. halogen C. chalcogen
B. halogen*
1. Elements in group 17 are considered _____________. A. alkali Metals B. halogens C. noble Gases
B. halogens*
*1. Which of the following gases exists as a diatomic molecule? A. krypton B. hydrogen C. argon
B. hydrogen
1. What is basic research? A. it deals primarily with solving practical real-world problems B. it deals primarily with the fundamentals of science that may result in future applications C. it deals primarily with solving practical laboratory problems
B. it deals primarily with the fundamentals of science that may result in future applications*
*1. Isotopes of carbon differ with respect to the number of _________. A. protons B. neutrons C. electrons
B. neutrons*
1. The scientific method involves various techniques which allow researchers to investigate scientific questions through _____ and _____. A. analysis and observations B. observations and experimentation C. analysis and predictions
B. observations and experimentation*
*1. Elements arranged horizontally in the periodic table are in the same_____? A. group or family B. period C. column
B. period*
*1. Precision is defined as how _____ the measured values are to one another. A. common B. reproducible C. accurate
B. reproducible*
*1. Due to periodicity, which of the following elements has chemical behavior similar to that of Oxygen? A. bromine B. sulfur C. carbon
B. sulfur*
*1. Which is of the following is an example of a physical property? A. lead forming lead oxide in the presence of air B. the color of paint C. digestion
B. the color of paint*
1. Which of the following would be good tools for making scientific observations during a chemical reaction? (Outcome # 10) (DOK 2) A. barometer, thermometer, scale B. thermometer, your eyes, clock C. thermometer, your eyes, tape measure
B. thermometer, your eyes, clock*
*1. Substance that exists as both an element and molecule
Br2, I2, N2, Cl2, H2, O2, F2
*1. The prefix nano- in the metric system represents a factor of _____. A. 10^9 B. 10^-6 C. 10^-9
C. 10^-9
1. How many significant figures are in 0.20 L? A. 3 B. 1 C. 2
C. 2*
*1. Who provided evidence for the existence of a nucleus in an atom? A. John Dalton B. J.J. Thomson C. Ernest Rutherford
C. Ernest Rutherford*
*1. Which statement about subatomic particles is NOT true? A. Protons and neutrons have almost the same mass. B. Protons and electrons have opposite charges. C. Protons and neutrons have the same charge
C. Protons and neutrons have the same charge*
Which of the following would be a good example of a hypothesis in the scientific method process? (Outcome # 10) (DOK 3) (Paired item 1) A. a clinician confirms that taking a vitamin every day will decrease the level of tiredness in people B. a clinician tells a patient that taking a vitamin every day, may decrease the level of tiredness in people C. a clinician contemplates that taking a vitamin every day, may decrease the level of tiredness in people
C. a clinician contemplates that taking a vitamin every day, may decrease the level of tiredness in people*
1. Which of the following is an example of basic research? A. a researcher tries to study the effect of a new drug on HIV-inhibition B. a researcher tries to develop a new anti-cancer drug C. a researcher studies a hormone and its prospect as a cell signaling molecule
C. a researcher studies a hormone and its prospect as a cell signaling molecule*
*1. Which is of the following is an example of a chemical property? A. water boils at 100 °C B. acids are sour and bases are bitter C. an iron nail rusts
C. an iron nail rusts*
*1. The number of protons in one atom of an element is that element's __________. A. mass number B. atomic mass C. atomic number
C. atomic number*
*1. Which of the following would be considered a physical change? A. digesting food B. burning paper C. boiling water
C. boiling water*
1. Oxygen gas is considered a _____? A. noble gas B. halogen C. chalcogen
C. chalcogen*
1. Which of the following is not part of the scientific method process? (Outcome # 10) (DOK 1) A. observation B. prediction C. discussion
C. discussion*
*1. It is important that scientists use units that are understood on a global level. These units are referred to as SI units which stands for _____. A. standard international units B. standard intercontinental units C. international system of units
C. international system of units
1. What is the SI unit for temperature? (Outcome # 7) (DOK 1) A. Celsius B. Fahrenheit C. kelvin
C. kelvin
*1. A statement about mass always being conserved in a chemical reaction is an example of a _____. A. hypothesis B. theory C. law
C. law
*1. Which list of elements contains ONLY nonmetals? A. helium, carbon, gold B. sodium, chromium, copper C. phosphorus, nitrogen, oxygen
C. phosphorus, nitrogen, oxygen*
1. Identify the chalcogen that has 18 neutrons in the nucleus. A. sulfur-32 B. sulfur-33 C. sulfur-34
C. sulfur-34
*1. Accuracy is defined as how close a measured value comes to a _____. A. core value B. fixed value C. true value
C. true value*
*1. How would you determine the density of an irregular object? A. It would be impossible to determine the mass of the object without more information. B. D = m/v, so measure the mass of the object using a balance. Then to find volume, measure the height, width, and length using an appropriate measuring tool. C. D = m/v, so measure the mass of the object using a balance. Then to find volume, fill a graduated cylinder with a known amount of water and immerse the object in the water. The amount of displaced water is the volume in cm3or mL.
D = m/v, so measure the mass of the object using a balance. Then to find volume, fill a graduated cylinder with a known amount of water and immerse the object in the water. The amount of displaced water is the volume in cm3or mL.
