Prefixes
What is the symbol and exponential notation for the prefix hecto?
h
1x10^2
What is the definition of a physical change?
What is the definition of a chemical change?
Physical: A change in matter which does not alter the chemical properties of the matter
Chemical: One chemical substance is transformed into one or more different substances
What is a group on the periodic table?
What is a period on the periodic table?
-A group (also known as a family) is a column of elements in the periodic table of the chemical elements
-The horizontal rows are called periods
What is matter?
Anything that has mass or takes up space
What is the formula for density?
D= m/V
What are some of the base SI units?
Length --> meter (m)
Mass --> kilograms (kg)
Time --> seconds (s)
Temperature --> Kelvin (K)
Amount of a substance --> mole (mol.)
Electric Current --> Ampere (A)
What scientific perspective can physical and chemical changes can be observed?
Macroscopic
What element is located in the 6th period, 2nd group?
Barium
What is special about the atoms of an element?
Elements are composed of atoms with identical physical and chemical properties
What are the threw viewpoints of Chemistry?
(Bonus: Define each perspective)
Macroscopic, Microscopic, Symbolic
What is the magnitude of a?
a --> atto therefore 1x10^18
You bought some bananas at the grocery store and forgot about them. Now they are rotting. Is this a physical or chemical change?
Chemical Change
In comparison to Alkali Metals, is Alkaline earth metals more reactive, less reactive, or have the same level of reactivity with oxygen?
Less reactive
How do liquid particles move?
Bonus: Why is this important?
Particles are quite close together and move with random motion throughout the container
Particles move rapidly in all directions but collide with each other more frequently than in gases due to shorter distances between particles
Michael buys several bags of balloons. On the package, it says that each bag has 100 balloons. He opens the bags and only one of them has 100 balloons inside; the other bags either have too many or too few.
How would you describe the bag of balloons with 100 balloons inside?
Accurate, but not precise
Reasoning:
This bag is accurate because it provided the correct number of balloons, however, the process is not precise as the results were clearly not repeatable. Accuracy deals with how close the measurement got to the accepted measurement. Precision deals with how consistent the measurement is. The bag with 100 balloons inside matched the claim made on the bag, meaning it was accurate. It was not precise because the other measurements show that the number of balloons is variable.
What is the prefix associated with the magnitude tera? Also include is symbol.
T
1x10^12
You are folding a piece of paper into a paper airplane then throw it. The airplane accidentally lands in a paper shredder. Is this a physical or chemical change?
Physical change
What group on the periodic tables is know to have very reactive element and these elements are considered metals?
Bonus: What's the name of these metals?
Group 1A
Alkali Metals
Saline has many uses in medicine. It's used to clean wounds, clear sinuses, and treat dehydration. What kind of mixtures are Saline solutions?
Homogenous! This is because the particles are distributed uniformly in the solution, why it is safe to use for medical purposes
Chemical formulas, electron density formulas, and line-bond formulas are all examples of what perspective of chemistry?
Symbolic
Since are measurements are decimal-based, what power is this based on?
Power of 10
What are the physical and chemical changes involved in burning wood?
Burning of wood is a example of both physical and chemical change! When wood is burnt the moisture present in it turns to vapour ,it is a physical change while it burns and generate CO2 is a chemical change
What are all the diatomic molecules?
Hydrogen, Nitrogen, Oxygen, Fluorine, Chlorine, Bromine, and Iodine
What is the difference between a pure substance and a mixture?
A pure substance consists only of one element or one compound
A mixture consists of two or more different substances, not chemically joined together.
Which of the following 10g metal samples would displaced the greatest amount of water?
a.) Copper (8.92 g/cm^3)
b.) Gold (19.3 g/cm^3)
c.) Iron (7.87 g/cm^3)
d.) Platinum (21.5 g/cm^3)
c. Iron