People/Laws
Who developed an early atomic theory stating that all matter is made of tiny particles called atoms?
Who is John Dalton?
Convert 217°C to Kelvin
217 °C + 273.15 = 490.15 K
How many seconds are in 50 years?
1.577 *10^9 seconds
How many Sigfigs does this number have:
100 centimetres in a meter.
Infinite
_______ is the study of matter and the changes that matter undergoes
What is Chemistry
Which Law states that atoms of elements combine in small, whole-number ratios to form different compounds?
What is the Law of Multiple Proportions
Convert 512°K to Celsius
521-273.15= 238.85°C
How many pg in 7.25×10-19 kg
7.25×10-4 picograms
How many significant figures are in 0.000800?
3, the left zeros are insignificant.
The “absolute” scale; Lowest possible temperature: 0 _____ (absolute zero)
What is Kelvin
What did Robert Millikan determine about the electron through his famous experiment?
What was his Famous Experiment?
He discovered the charge of an electron
The oil drop experiment
Convert −40°C to Fahrenheit.
-40°F
They're the same.
Celsius to Fahrenheit =
(C*9/5)+32 = F
If someone weighs 234 lbs. What is that in Gigagrams.
(1 lb = 435.6g)
1.02×10-4 Gg
Round 0.09995 to 3 significant figures.
0.100
Who used a cathode ray tube and applied high voltage to investigate the particles inside atoms?
Who is J.J. Thomson
This person discovered the electron. He has the plum pudding model/Chocolate chip cookie model for the atom.
Who are they?
J.J. Thompson
Using a cathode ray tube, he discovered that things are happening because the particles are leaving the metal and it is seen to us as light. THOSE PARTICLES were discovered at ELECTRONS (negatively charged)
Convert 347.6°F to Kelvin.
448.48 K
A patient needs to take 7.5 mL of medicine twice a day. The medicine is sold in 2.5-gallon containers. If each gallon contains 3.7854 L, approximately how many days will one container of medicine last?
631 days
What is the answer with the correct sig figs?
(21.29+0.4498)/1.0378
Answer: 20.95
21.29 -> 2 dps
0.4498 -> 4 dps
(21.29+0.4498)= 21.74
keep 2 decimal places:
21.7398/1.0378 = 20.947967
1.0378 -> 5 sfs
21.74 -> 4 sfs
final answer: 4 sfs
20.95
Atoms can be identified specifically by their protons (atomic number)
Do protons and neutrons have approximately the same mass?
Which number changes to form an isotope?
Yes, protons and neutrons have approximately the same mass
The number of NEUTRONS change to form isotopes.
What did Ernest Rutherford do and what did he discover about the structure of the atom?
Rutherford performed the gold foil experiment and proposed the nuclear model, where the positive charge is concentrated in the nucleus?
Convert 512.4°K to Fahrenheit.
462.65°F
A newly discovered metal has a density of 3.76×10-2 lb/in³. If 1 lb=453.592 grams, then what is its density in kg/L.
1.04 kg/L
Solve equation with correct sigfigs.
(53.27-70.9701)/0.071
Answer: -2.5 * 10-2
(53.27-70.9701)= -17.7001
-17.7001/0.071= -249.29718 (don't round yet)
-17.70 (2 dp = 4sfs)
0.071 (2 sfs)
final answer: -250
-2.5 * 10^2
A piece of metal has a mass of 2.35×104 mg and occupies a volume of 3.75×10-2 L.
What is its density in g/mL?
0.627 g/mL