1
Data based on qualities
Write the following values in standard notation:
a) 9.6 x 10-3
b) 7.008 x 106
c) 2.03 x 102
d) 5.04 x 10-4
a) 0.0096
b) 7,008,000
c) 203
d) 0.000504
What is an aqueous solution?
When the solute is dissolved in water
What is matter?
This is objective, based on senses
What is an observation?
Data based on quantities (numbers and measurements)
What is quantitative data?
How many significant figures are in the following values?
a) 3.01
b) 850
c) 7,102.0
d) 0.00990
a) 3
b) 2
c) 5
d) 3
Classify the following as a heterogeneous or homogeneous mixture:
a) paint
b) saltwater
c) sand
d) air
a) HE
b) HO
c) HE
d) HO
A measure of the amount of matter
What is mass?
Nadia ate 10 Huel bars in the month of October.
Sam 12 Huel bars in the month of October.
Kiara ate 14 Huel bars in the month of October.
What is the average number of Huel bars that this group consumed in October?
10 + 12 + 14 = 36 / 3 = 12 Huel Bars
What is the difference between accuracy vs precision?
Accuracy measures how correct or close to the truth a measurement is and Precision measures how specific or consistent a measurement is.
Convert 275oF to Kelvin
°F = 275
K = ?
K = °C + 273.15
°C = 5/9 (°F - 32)
°C = 5/9 (°F - 32)
°C = 5/9 (275 - 32)
°C = 5/9 (243)
°C = 135
K = °C + 273.15
K = 135 + 273.15
K = 408.15
FINAL ANSWER: 408 K
Classify the following as an element or compound:
a) H2O
b) O2
c) C6H12O6
d) Li
a) compound
b) element
c) compound
d) element
The smallest unit of an element that maintains the identity of the element
What is an atom?
A student measures the mass of an object as 57 grams. The actual mass is 60 grams. Calculate the percent error.
|(57g - 60g)/(60g)| x 100%
|(-3g)/(60g)| x 100%
0.05 x 100%
FINAL ANSWER = 5%
What is the difference between extensive and intensive properties?
Extensive properties, like mass, are dependent on amount of the substance, whereas intensive properties, like magnetism, are not.
Physical properties, like density, can be observed without changing the identity of the substance whereas chemical properties, like reactivity, can only be observed by performing a chemical change.
Convert 1,800mm to cm
1,800mm x 1m x 100cm = 180,000cm
x 1000mm x 1m = 1,000
FINAL ANSWER: 180cm
List 3 signs that may demonstrate that a chemical change has occurred
Release of light
Sudden temperature change
Sudden color change
Odor change
Gas given off
Sudden appearance of a precipitate
A pure substance that cannot be broken down into anything simpler or more stable
What is an element?
Write a sentence using the terms atom, element, and compound to describe water, which has the following chemical formula: H2O
The compound H2O has 2 atoms of the element Hydrogen and 1 atom of the element Oxygen.
What is the difference between a chemical change and a physical change, and which results in a chemical change?
A physical change does not change the substance’s identity whereas a chemical change does because a chemical reaction occurs.
Give a scientific investigation design with appropriate constants and variables (independent variable and dependent variable) using the example below:
Example: I want to see if drinking coffee helps me to be more productive.
Independent variable = whether or not I drink coffee
Dependent variable = how much work I can get done in a certain amount of time
Control group = not drinking coffee
Experimental group = drinking coffee
Constants = same type of work/task, same food, same amount of sleep beforehand, same environment to work in
Matter is never created or destroyed, it only changes forms
What is the Law of Conservation of Matter?
Create a visual to summarize how matter can be classified
Matter
Substance Mixture
Element Compound Homogeneous Heterogeneous
Classify the following as a physical change or a chemical change:
a) slicing an apple
b) burning a candle
c) iron rusting
d) water boiling
a) physical
b) chemical
c) chemical
d) physical