States of Matter/ Sig Fig
Which change is a physical change?
a) Wood Burning
b) Iron Rusting
c) Dynamite Exploding
d) Gasoline Evaporating
Gasoline Evaporating
Express the quantity 33.2 x 10-4m in mm.
3.32 mm
Perform the calculation to the correct number of significant figures.
(43.998 x 0.00552) / 2.002
0.121
Determine the number of protons and neutrons in the isotope Fe-58.
26 Protons and 32 Neutrons
Which pair of elements do you expect to be the most similar in their chemical properties?
a) K and Fe
b) O and Si
c) Ne and N
d) Br and I
Br and I
Which property of rubbing alcohol is a physical property?
a) density (0.786 g/cm3) b) flammability
c) boiling point (82.5 C) d) Melting point(-89 C)
What is the mass of a 1.75-L sample of a liquid that has a density of 0.921g/mL?
1.61 X 103 g
Perform the calculation to the correct number of significant figures.
(8.01 - 7.50) / 3.002
0.17
An isotope of an element contains 82 protons and 122 neutrons. What is the symbol for the isotope?
204,82 Pb
Which element is NOT a main-group element?
a) Se
b) Mo
c) Sr
d) Ba
Mo
How many Significant Figures are in 0.0023040
Convert 1,285 cm2 to m2
0.1285 m2
A solid metal sphere has a radius of 3.53 cm and a mass of 1.796 kg. What is the density of the metal in g/cm3? The volume of a sphere is V=4/3pir3
9.75 g/cm3
Determine the number of electrons in the Cr3+ ion.
21 electrons
A naturally occurring sample of an element contains only two isotopes. The first isotope has a mass of 68.9255 amu and a natural abundance of 60.11%. The second isotope has a mass of 70.9247 amu. Determine the atomic mass of the element.
69.72 amu
Which of the following properties is extensive?
a) Density
b) melting point
c) color
d) electrical conductivity
e) mass
E) Mass
The gas mileage of a certain German automobile is 22 km/L. Convert this quantity to miles per gallon.
(1L = 0.264gal) (1km = 0.6214mi)
52mi/gal
An automobile uses 0.05mL of oil for each kilometer it is driven. How much oil (in liters) is consumed if the automobile is driven 20,000km?
1 liter
If X can represent the chemical symbol of any element in the periodic table, the 4028X represents an isotope of:
Nickel
What is the charge of the ion most commonly formed by S?
2-
How many significant figures are in the measurement 0.03030 Kg
Four
Some medical labratory tests can be run on as little as 5 microliters of blood serum. What is this volume in milliliters?
5 x 10-3mL
A heater gives off heat at a rate of 300kJ/min. What is the rate of heat output in kilocalories per hour? (1cal = 4.184J)
4,302,103.25 kc/hr or 4.30 x 106
How many electrons are present in 31P3+?
12
When two elements form two different compounds, the masses of element B that combine with 1g of element A can be expressed as a ratio of small whole numbers. Which law does this refer to?
Law of multiple proportions