Module 1 (Test Week 2) Flashcards
Matter
Anything that has mass and takes up space
What word can we replace the word “matter” with until we discuss the concept of matter ?
Weight (even though the definitions are different it is ok for now)
What is almost everything around us?
Matter
Light
A very common thing that surrounds you that has no mass and takes up no space.
What is considered pure energy and not matter?
Light
What is the first thing you have to be able to do in order to study matter ?
You have to be able to measure it.
When making _____, the _____ you use are just as important as the _____ you get.
- Measurements
- Units
- Number
The metric system
The system of standard units used to measure.
To know how much _____ is in an object, we must measure its _____.
- Matter
2. Mass
Chemistry
The study of matter and energy and the interactions between them.
Gram
The unit for mass in the metric system
Weight
Measures how hard gravity pulls on that object.
_____ depends upon where an object is _____ does not.
- Weight
2. Mass
Newton
The metric unit for weight.
Slug
The English unit for mass.
Meter
The metric unit for distance.
Foot
The English unit for distance.
Liter
The metric unit for volume.
Gallon
The English unit for volume.
Second
The English and metric unit for time.
- Mass
- Distance
- Volume
- Time
Metric unit: English unit:
- Gram 1. Slug
- Meter 2. Foot
- Liter 3. Gallon
- Second 4. Second
Micro - .000001 Milli - .001 Centi - .01 Deci - .1 Base unit - 1 Deca - 10 Hecta - 100 Kilo - 1,000 Mega - 1,000,000
Metric units of measure and their numerical equivalents.
Who uses the metric system as their main system of units ?
Scientists
Factor Label Method
Muy importante to the study of chemistry. A way to convert between units.
English/Metric Relationship
1in. = 2.54 cm
1 slug = 14.59 kg
1 gallon = 3.78 liters
One _____ _____ is the same as one _____.
- Cubic centimeter
2. Milliliter
Units of Measurement
A piece of information about a scale used in a measurement.
Derived Units
Two measurements or more plus “math”.
Accuracy
Close to true value.
Precision
Reflects the scale of the measurement.
Graduated Cylinder
A device that looks like a rain gauge that measures volume by the margins on its side.
Meniscus
A curved surface that happens when you pour liquid into a graduated cylinder; it curves because the attractive forces between the cylinder and the liquid makes the liquid move upon the sides.
Significant Figures
A digit within a number is considered significant if :
- Not a zero
- A zero between two significant figures
- A zero at the end of a number to the right of the decimal point.
Scientific Notation
The way to write numbers so that no matter their size, they always have a decimal point in them.
Density
An object’s mass divided by the volume the object occupies.
Or : p = M/v
Adding and Subtracting with Significant Figures
When adding and subtracting measurements, round your answer so that it has the same precision as the least precise measurement Ingrid the equation.
Ex. 25.46 cm - 7.8 cm = 17.66. To precise : should be 17.7.
Multiplying and Dividing with Significant Figures
When multiplying and dividing measurements, round the answer so that it has the same number of significant figures as the measurement with the fewest significant figures.
Ex. 3.012 miles /0.430 hours = 7.0046… Should be: 7.00 miles/ hours
Because the measurements for grams, meters, liters, and seconds are exact, the significant figures do not apply when transferring to the kL, hM, decG, etc.
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