CHEM EXAM CHAPTER 1,2,3
The width, length and height of a large, custom-made shipping crate are 1.22 m, 3.22m, and 0.83m, respectively. The volume of the box using the correct number of significant figures ______m^3
3.3m^3
All samples of a given compound, regardless of their source or how they were prepared, have the same proportions of their constituent elements. Which law does this refer to?
The law of definite proportions
Identify a liquid
Definite volume, no definite shape
Determine the name of N2O5
Dinitrogen pentoxide
How many liters of wine can be held in a wine barrel who capacity is 22..0 gal? 1 gal=4qt=3.7854 L
22.0 gx 3.7854l= 83.3
Determine the volume of an object that has a mass of 455.6 g and a density of 19.3 g/cm^3
23.6
Identify an anion
An atom that has gained an electron
Boron has two naturally occurring isotopes: B-10 with an isotopic mass of 10.013 amu B-11 with an isotopic mass of 11.009 amu Calculate the % abundance for each isotope if the average atomic mass of boron is 10.81 amu.
Answer:
If a student peforms an experiment to determine the density of sugar solution. she obtains the following results: 1.11g/ml, 1.81 g/ml, 1.95 g/ml, 1.75 g/ml. If the actual value for the density of sugar solution is 1.75 g/ml, which statement below best describes her results?
Answer:
If the walls in the room are 955 square feet in area, and a gallon of paint covers 15 square yards, how many gallons of paint are needed for the room? (3 ft= 1yd)
Answer:
Calculate the mass percent composition in Li3PO4?
Answer: 17.98%
Determine the answer to the following equation with the correct number of significant figures: (4.123X 0.12) + 24.2
Answer: 24.7
What is the molar mass of nitrogen gas?
Answer: 28.0 g/mol
How many neutrons are in nickel?
Answer: 31
How many significant figures are in the measurement, 0.005890g?
Answer: 4 sig figs
Given the formula for calcium hydrogen Sulfate
Answer: Ca(HSO4)2
When two element form two different compounds, the mass of element B that combine with 1g of element A can be expressed as a ratio of small whole numbers?
Answer: Law of Mutiple Proportions
Which of the compounds, Li3P, PH3, C2H6, IBr3 are iconic compounds?
Answer: Li3P and PH3
Which of the following represents a physical property? a. Sodium metal is extremely reactive with chlorine gas. b. Mercury is a silvery liquid at room temperature c. Aluminum has a tendency to "rust" e. Argon has an unreactive nature
Answer: Mercury is a silvery liquid at room temperature
Which of the following statements about subatomic particles is TRUE? a Neutral atom contains the same number of protons and electrons b. Protons have about the same mass as electrons c. Electrons make up most of the mass of an atom d. Protons and neutrons have opposite, but equal in magnitude, charges e. Neutrons and electrons are found in the nucleus of an atom
Answer: Neutral atom contains the same number of protons and electrons
A chemical change a. occurs when methane gas is burned b. occurs when paper is shredded c. occurs when water is vaporized d. occurs when salt is dissolved in water e. occurs when powdered lemonade is stirred into water
Answer: Occurs when methane gas is burned.
Determine the empirical formula for a compound that is found to contain 10.15 mg P and 34.85 mg Cl.
Answer: PCl3
What answer should be reported with the correct number of significant figures, for the following calculations? (965.43 X 3.911) + 9413.4136
Answer: Should be reported four sig figs
What should have been reported, with the correct number of significant figures, for the following calculation? (249.362)/ 63.498
Answer: Should be reported three sig figs
Which of the following statements about isotopes is true? A) Isotopes of the same element differ only in the number of electrons they contain. B) An isotope of an atom with a larger number of neutrons is larger than an isotope of the same atom that contains fewer neutrons. C) Isotopes of the same element have the same mass. D) Isotopes of the same element don't usually have the same properties. E) Some elements have 3 or more naturally occurring isotopes.
Answer: Some elements have 3 or more naturally occurring isotopes
Hydrochloric acid is an example of A) a compound. B) an element. C) a heterogeneous mixture. D) a homogeneous mixture.
Answer: a compound
Two or more substances in variable proportions, where the composition is constant throughout are
Answer: a homogenous mixture
choose the purse substance below a. tea b. a casserole c. carbon monoxide d. sugar water e. pomergranate juice
Answer: carbon monoxide
Choose the homogenous mixture from the list below a. cola b. mud c. ice water d. salad dressing e. salsa
Answer: cola
If a student peforms an experiment to determine the density of sugar solution. she obtains the following results: 1.11g/ml, 1.81 g/ml, 1.95 g/ml, 1.75 g/ml. If the actual value for the density of sugar solution is 1.75 g/ml, which statement below best describes her results?
Answer: her results are neither precise nor accurate
Isotopes differ in number of what particles a. beta particles b. protons c. electrons d. neutrons e. gamma particles
Answer: neutrons
which of the following are examples of intensive properties a. density b. volume c. mass d. none of the above are examples of intensive properites e. all of the above are examples of intensive properties
Answer: none of above are example of intensive properties Intensive prop consit of: tempertaure, color, boiling point, luster, and hardness.
Which of the following does not describe a non-metal? a. tend to gain electron b. found in the upper right-hand corner of the periodic table c. poor conductors of electricity d. nonmetals are generally unreactive
Answer: poor conductors of electricity and poor conductors of heat
Identify the charges of the protons, neutrons, and electrons
Answer: protons +1, neutrons 0, and electrons -1
Determine the answer of the following equation with correct number of significant figures (17.103+ 2.03) X 1.02521
Answer: the determinate of the this equation is 3 sig figs
Identify the element that has an atomic number of 40?
Answer: zirconium
Which species is represented by the following information? P+= 17. n=18 e-=18 A. Cl B. Cl- C. Ar D. Ar+ E. Kr
Cl
Determine the name for CoCl2* 6 H20
Cobalt (II) chloride * hexahydrate
What does "X" represent in the following symbol ? 235 92. X
Urnamium top number: Mass #. ( protons + neutrons) bottom number: Atomic # (protons)
Two or more substances in variable proportions, where the composition is constant throughout are
homogenous mixture
Which of the following statements is false? A) Halogens are very reactive elements.B) The alkali metals are fairly unreactive.C) Sulfur is a main group element. D) Noble gases do not usually form ions. E) Zn is a transition metal.
noble gases do not usually form ions
Give the name for PBr3
phosphorus tribromide
Determine the name for P4O10
tetraphosphorus decoxide
