Matter
What are the phases of matter
solid, liquid & gas
What is the first step in the Scientific Method?
make objective observation
define logs
the logarithm is the inverse function of exponents.
what is standard deviation
a measure of how dispersed the data is in relation to the mean.
how many sig figs does this number have
7000
1
it's composition; what elements (C,H,O,N) are present and in what proportion!
what is the end goal of the scientific method
to create theories that have been tested by experiments
solve this:
3^4 =
Log 3 (81) =?
3^4 = 81
Log 3 (81) = 4 (3 raised to what power would = 84)
what is uncertainty and what is the formula for it
average +/- standard deviation
Uncertainty of a measured value is an interval around that value such that any repetition of the measurement will produce a new result that lies within this interval.
how many sig figs does this number have
0.0000009
what is a physical change
what is a chemical change
physical change: when the piece of matter is not changing composition; it does not change its appearance; property displayed without changing composition
chemical change: when the piece of matter does change its composition; it combines with another to form a new piece of matter
how do I set up/create a hypothesis?
If...then...
If I need to study to pass the exam, then if I do not study then I will not pass the exam
If sugar causes cavities, then people who eat a lot of candy may be more prone to cavities.
solve this
log 5 (125) =
log 5 (125) = 3
find the standard deviation of
50, 100, 500
201.38
A football team lost 5 yards to the bench and then gained 9 yards away from the bench. What is the total yard distance from the bench?
-5 yd + 9yd = 4 yd from the bench
what are the two properties of matter
physical and chemical
What is a responding variable? give an example too!
it is another name for a dependent variable!!!
a variable (often denoted by y ) whose value depends on another variable
For example:
let's say you were investigating how light affects plant growth. The variable you change would be the amount of light (independent variable). The responding variable (or dependent variable) would be the height of the plants. In other words, the plants are responding to changes in light that you, the researcher, make.
solve this
e ^ 2x = 9
x = (ln 9)/2
what tools (scales, rulers, etc...) have uncertainty
how many sig figs of these 2 numbers
80.0
0.0280.0 has 3
0.02 has 1
name examples of physical change
name examples of chemical change
physical change: size, temp., texture, melting point, smell, density
chemical change: bonding behavior, half-life, time to react to something, how they burn, decaying
what is a manipulated variable? give an example too!
it is the independent variable!
example: I want to see if studying longer improves exam scores. The number of hours spent studying is the independent variable. This is the variable that the teacher manipulates to see how it affects exam scores. The response variable (or dependent variable): The exam scores. This is the variable that changes as a result of the manipulated variable (independent variable) being changed.
solve this
log 1000 =
3
which tool had the most uncertainty or in other words which tool was more precise? Pan or analytical
how about for, beaker vs graduated cylinder
analytical balance & graduated cylinder!!!
Debbie bought 10 notebooks and 5 pens costing 2 dollars each. How much did Debbie pay?
and
Half a number plus 5 is 11. What is the number?
2 × (10 + 5) = 2 × 10 + 2 × 5 = 20 + 10 = 30 dollars
(1/2)x + 5 = 11
(1/2)x + 5 - 5 = 11 - 5
(1/2)x = 6
2 × (1/2)x = 6 × 2
x = 12