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
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
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
Identify an anion
An atom that has gained an electron
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:
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
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
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 name for CoCl2* 6 H20
Cobalt (II) chloride * hexahydrate
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
What does "X" represent in the following symbol ? 235 92. X
Urnamium top number: Mass #. ( protons + neutrons) bottom number: Atomic # (protons)
