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10 Cards in this Set

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  • Back
_______1) Which of the following balances has the least uncertainty?
A) analytical balance, ± 0.0001 g D) electronic balance, ± 0.001 g
B) beam-type balance, ± 0.01 g E) platform balance, ± 0.1 g
C) double-pan balance, ± 1 g
A) analytical balance, ± 0.0001 g
_______2) One cubic centimeter of helium gas contains 26,900,000,000,000,000,000 atoms at standard conditions. Express this number of atoms in scientific notation.
A) 2.69 × 1017 B) 2.69 × 1018 C) 2.69 × 1019 D) 26.9 × 1018 E) 26.9 × 1019
C) 2.69 × 1019
_______3) Which of the following terms defines the amount of energy required to raise one gram of any substance one degree on the Celsius scale?
A) calorie B) heat C) specific heat D) joule
E) none of the above
C) specific heat
_______4) Dynamite is made from TNT and cellulose paper. If the formula is C7H5(NO2)3, what is the number of atoms in the formula of the explosive?
A) 4 B) 18 C) 21 D) 45 E) 48
C) 21
Because 7+5+(1+2)3= 21
_______5) What is the term for the value which indicates the number of protons for an atom of a given element?
A) atomic notation
B) atomic number
C) atomic mass
D) mass number
E) none of the above
B) atomic number
_______6) Which element has the following electron configuration: 1s2 2s2 2p6 3s2 3p6 4s1?
A) Al
B) Ca
C) K
D) Na
E) none of the above
C) K
_______7) What is the predicted ionic charge for a Cl ion?
A) 1+ B) 1- C) 7+ D) 7- E) none of the above
B) 1-
_______8) Add 25.5 cm to 0.50 cm and round off the answer.
A) 26 cm B) 26.0 cm C) 26.05 cm D) 26.1 cm E) 27 cm
B) 26.0 cm
9) Stainless steel is composed of iron, manganese, chromium, and nickel. If a 2.00 g sample was analyzed and found to contain 2.75% manganese, what is the mass of manganese in the sample?
9) 2.00 g X 2.75/100 = 0.0550 g
10) The specific heat of ice is 0.492 cal/(g × °C). How many calories of heat are required to raise 100.0 g of ice from
-20.0°C to -0.5°C?
10) 0.492 cal/(g × °C) X 100.0 g X |(-0.5°C- (-20.0°C))| = 959 cal