Chapter 1 Review
What are the three Basic metric units used to measure length, mass, and time?
- meters - grams - seconds
A box has a volume of 1.01 m^3, One student says has a volume 1 m^3 , while the second says it has the volume is 1.23m^3?
- the second is more precise - the first is more accurate
An object has a mass of 123.4 kg, Which is the same as 8.456 slugs. which measures more mass: 1 slug or 1 kg?
1 Slug
What are the three significant figure rules?
1) All non-zero figures are significant 2) A zero is significant if it is between two significant figures 3) A zero is also significant if it's at the end of the number and to the right of the decimal point.
Whats the answer of 21.0234g - 12 g/make sure the significant figures are right?
9g
Significant Figures
A digit in a measurement that contributes to the measurement's precision.
Mass
A measure of how much matter exists in an object.
Weight
A measure of how strongly gravity pulls on an object.
Density
A measure of how tightly packed the Matter in a substance. OR Density = Mass/Volume
Unit
A quantity that describes the measurement being made.
Matter
Anything that has mass and takes up space
A carpet-layer measures a room to be 4.6 m long and 3.2 m wide. He multiplies the two measurements and reports the area of the room to be 14.72. What two things are wrong with his answer?
First he didn't put the units, and there are too many significant figures.
You are reading a scientist's lab notebook and see a measurement of 14.5 mL. What was the scientist measuring: length, mass, volume, or time?
If your reading a scientist's lab notebook and see a measurement of 14.5mL the scientist was measuring VOLUME.
What is the Basic Metric unit for volume?
Litter
What physical quantity is measured with mg?
Mass
When a figure is significant, does that means it is mathematically important?
No not necessarily
What is the Basic English unit for Mass?
Slugs
Accuracy
The closeness of a measurement to the true value of what is being measured/how close to real answer.
Precision
The degree to which repeated measurements show the same result/ to what degree(remenber with lots of decimals places).
When you put ice cubes in a glass of water, the ice cubes float. What does that tell you about the density of ice compared to the density of water?
The density of water is more than the density of an ice cube.
Two students are measuring the mass of an object. One reports his answer as 4.56 g, while the other reports her answer as 4.58 g. The teacher gives each student 100% credit. How can they both be right?
The last digit is alway uncertain.
What happens to the significant figures when you add or subtract to measurements together?
When adding and subtracting measurements, you must report your answer in the same precision as the least precise number in the problem. ex. 21.0234g -12g = 9g
What happens to significant figures when you multiply or divide measurements?
When multiplying and dividing measurements, you must report your answer with the same number of significant figures as the measurement which has the fewest significant figures.
You are measuring the volume of an object using a scale that is marked off with lines that represent 10mL each. To what level of precision (one mL, tenth of mL, hundreth of an mL, etc.) should you report a measurement?
You would measure to one mL
