Whats the matter? 🧪
1) Choose the homogeneous mixture from the list below.
A) a burrito
B) ice water
C) mud
D) wine
E) salad
D) wine
2) The mass number is equal to
A) the sum of the number of the neutrons and electrons.
B) the sum of the number of protons, neutrons, and electrons.
C) the sum of the number of the electrons and protons.
D) the sum of the number of protons and neutrons.
E) the number of protons
D) the sum of the number of protons and neutrons.
3) Which of the following elements is an alkaline earth metal?
A) Be
B) Pu
C) I
D) Rb
E) S
A) Be
5) If the melting point of copper metal is 1085°C, what is its melting point in Kelvin?
A) 1358 K
B) 812 K
C) 777 K
D) 571 K
E) 1985 K
A) 1358 K
14) How many significant figures are in the measurement, 273.300 m?
A) 2
B) 3
C) 4
D) 5
E) 6
E) 6
4) Choose the pure substance from the list below.
A) carbon dioxide
B) a casserole
C) coffee
D) orange juice
E) salt water
A) carbon dioxide
8) Identify the description of an atom. A) protons and neutrons in nucleus; electrons in orbitals
B) electrons in nucleus; protons and neutrons in orbitals
C) neutrons in nucleus; protons and electrons in orbitals
D) protons and electrons in nucleus; neutrons in orbitals
E) neutrons and electrons in nucleus; protons in orbitals
A) protons and neutrons in nucleus; electrons in orbitals
17) Which of the following elements is NOT a metal?
A) Ca
B) Li
C) Zn
D) Ne
E) Co
D) Ne
7) The diameter of an atom is approximately 1 × 10-10 m. What is the diameter in decimeters?
A) 1 × 10-9 dm
B) 1 × 10-24 dm
C) 1 × 10-6 dm
D) 1 × 10-21 dm
A) 1 × 10-9 dm
23) How many significant figures are in 1.650 × 104 m?
A) 3
B) 5
C) 1
D) 2
E) 4
E) 4
9) Which of the following is an example of a chemical change?
A) baking soda dissolves in water
B) ice melting
C) coffee brewing
D) leaves turning color in the fall
E) None of the above is a chemical change.
D) leaves turning color in the fall
24) How many electrons are in each neutral atom of titanium?
A) 25.9
B) 29
C) 26
D) 22
E) 47.9
D) 22
18) Identify the element that has an atomic number of 70.
A) oxygen
B) bromine
C) gallium
D) ytterbium
E) mercury
D) ytterbium
6) Calculate the mass (in g) of 1.9 × 1024 atoms of Pb.
A) 6.5 × 102 g
B) 3.1 × 102 g
C) 2.2 × 102 g
D) 4.1 × 102 g
E) 1.7 × 102 g
A) 6.5 × 102 g
11)How many significant figures are there in the answer to the following problem? (3.335 × 5.400) + 0.940 = ?
A) one
B) two
C) three
D) four
D) four
13) In a chemical reaction, matter is neither created nor destroyed. Which law does this refer to?
A) First Law of Thermodynamics
B) Law of Modern Atomic Theory
C) Law of the Conservation of Mass
D) Law of Definite Proportions
E) Law of Multiple Proportions
C) Law of the Conservation of Mass
22)What does "X" represent in the following symbol?
28
X
14
A) silicon
B) nickel
C) zinc
D) ruthenium
E) sulfur
A) silicon
16) Which of the following is equal to exactly 1 mole of atoms?
A) 34.00 grams of selenium
B) 6.00 grams of carbon
C) 26.98 grams of aluminum
D) 12.31 grams of magnesium
E) 31.93 grams of cobalt
C) 26.98 grams of aluminum
10)A mass of mercury occupies 0.550 L. What volume would an equal mass of ethanol occupy? The density of mercury is 13.546 g/mL, and the density of ethanol is 0.789 g/mL.
A) 9.44 L
B) 0.0320 L
C) 31.2 L
D) 0.106 L
A) 9.44 L
25)The estimated costs for remodeling the interior of an apartment are: three 1-gallon cans of paint at $13.22 each, two paint brushes at $9.53 each, and $135 for a helper. The total estimated cost with the appropriate significant figures is $ ________.
A) 1.9 × 102
B) 193.7
C) 194
D) 2 × 102
E) 193.72
C) 194
20) Gold is an example of
A) a compound.
B) an element.
C) a heterogeneous mixture.
D) a homogeneous mixture.
B) an element.
12) An ion has 8 protons, 9 neutrons, and 10 electrons. The symbol for the ion is
A) 17Ne2+ .
B) 17O2-
C) 19F+
D) 17O2+
E) 19F-
B) 17O2-
15) How many moles of potassium are contained in 449 g of potassium?
A) 23.6 moles
B) 0.956 moles
C) 14.5 moles
D) 11.5 moles
E) 6.67 moles
D) 11.5 moles
19)The density of air under ordinary conditions at 25°C is 1.19 g/L. How many kilograms of air are in a room thatmeasures 11.0 ft × 12.0 ft and has a(n) 10.0 ft ceiling? 1 in. = 2.54 cm (exactly); 1 L = 103 cm3
A) 44.5
B) 4.45 × 104
C) 3.99
D) 0.1145
E) 0.166
A) 44.5
21)How many significant figures are there in the answer for the following problem? [(154.7 - 132) × 3.07]/0.700 = ?
A) one
B) two
C) three
D) four
B) two