Which of the following is considered a hypothesis (as opposed to an observation)? -
ANSWERBirds can fly because they have hollow bones
Which of the following would be considered a theory? - ANSWERHelium balloons float
because helium is less dense than air.
Which of the statements below is NOT part of the scientific method? - ANSWERAll of
the above steps are part of the scientific method.
Which statement about a hypothesis is TRUE? - ANSWERAll of the above statements
are true.
Who discovered the law of conservation of mass? - ANSWERAntoine Lavoisier
The distance between two hydrogen atoms in a molecule of water 0.0000000000172 m.
Express this distance in scientific notation. - ANSWER1.72 x 10^-10 m
Which of the following would NOT be considered a correct conversion factor? -
ANSWER1 pair of shoes = 1 shoe
In the number 48.93, which digit is estimated? - ANSWER3
The correct number of significant figures in the number 0.027090 is: - ANSWER5
The base SI unit for temperature is: - ANSWERKelvin
The correct scientific notation for the number 0.00050210 is: - ANSWER5.0210 x 10^-4
How many inches are in 25.8 cm? - ANSWER10.2 in
Which of the following statements is NOT part of the rules for determining significant
figures? - ANSWERNon-zero digits at the end of a number are not significant.
The correct number for significant figures in the number 1.250100 is: - ANSWER7
How many milliliters are in 17.5 L? - ANSWER1.75 x 10^4 mL
, Which state of matter has atomic spacing that is close together and definite shape? -
ANSWERSolid
Which state of matter has atomic spacing that is far apart and definite shape -
ANSWERLiquid
What is the calue of 783 K in units of C - ANSWER510 C
In order, what is the freezing point, room temperature and boiling point of water
according to the Celsius scale? - ANSWER32-75-212
Which state of matter has indefinite shape and is compressible? - ANSWERGas
How would you classify raisin bran? - ANSWERmixture- heterogeneous
Which type of energy is associated with the burning of gasoline? - ANSWERChemical
Which of the following is a heterogeneous mixture? - ANSWERRaisin bran
Which of the following statements about compounds is TRUE? - ANSWERA substance
composed of two or more elements is fixed, definite proportions.
Which among the following statements is FALSE? - ANSWERNone of the above
Cr is a member of which family? - ANSWERnone of the above
How many neutrons are present in C-14? - ANSWER8
An atom containing 7 protons, 8 neutrons, and 7 electrons - ANSWERIs charge-neutral
If an isotope of an element has 27 neutrons and a mass number of 52, how many
electrons must it have? - ANSWER25
Group 7A elements are called: - ANSWERHalogens
What is the correct chemical symbol for tin? - ANSWERSn
What is the charge on the cesium ion? - ANSWER1+
What is the correct formula for a potassium ion with 18 electrons? - ANSWERK+
Which of the following is NOT part of Dalton's Atomic Theory? - ANSWERAll of the
above
Group 8A elements are called? - ANSWERNoble gases
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