Sig Figs & Scientific Notation
What do significant figures tell you about a number?
What is the prefix multiplier of deci-?
10^-1
What does endothermic and exothermic mean?
Endothermic - Absorbing Heat
Exothermic - Releasing Heat
Give an example of a homogeneous mixture and a heterogeneous mixture.
What are the charges of protons, neutrons, and electrons?
Protons - Positive
Neutrons - Neutral
Electrons - Negative
Calculate 4.8 - 3.965
How many significant figures is your answer?
1
10^9
Is condensation exothermic or endothermic?
Exothermic
Give an example of a chemical change and a physical change
Many correct answers
The atom's number of protons
What is 2.47 x 10^6 s in ps?
2.47 x 10^18 ps
My hand gets burned by steam. Describe what parts of this are endothermic, and what parts are exothermic. Bonus points: Include phase changes in your description
My hand is endothermic, the steam CONDENSES into a liquid on my hand, which is an exothermic process.
Is the following a chemical or physical change? A block of dry ice sublimes
Physical Change
A sulfur atom has a mass of 34 amu. How many neutrons does it have?
18 neutrons
668.0(1.245 + 255) = ___
1.71 x 10^5
What is 9675 m^3 in mm^3?
9.675 x 10 ^12 mm^3
Convert -55.00 degrees Fahrenheit to Kelvin
224.8 K
Classify the following substances: Silver ring, sand, hot tea, sugar.
Silver ring - Pure, element
Sand - Mixture, heterogeneous
Hot Tea - Mixture, Homogenous
Sugar - Pure, compound
What is the charge of a calcium atom with 18 electrons?
+2
When performing unit conversions, why do we use the number of significant figures from the starting number rather than from our conversion factors?
Our conversion factors are exact. Exact numbers have unlimited significant figures, so we take the lowest which will always be whatever number that we start with.
Convert 475.2 cm^3 to megaliters.
4.752 x 10^-5 ML
Which element would more easily form a 2+ ion, a strontium atom, or an oxygen atom? Bonus points for why.
A strontium atom, it is a metal. Metals form cations, nonmetals form anions.
Give three examples of chemical properties
Radioactivity, pH level, flammability, corrosiveness, toxicity, reactivity, stability, etc.
How many protons, neutrons, and electrons in the following: Potassium, with a mass of 40 amu, and a charge of +1
19 protons
21 neutrons
18 electrons