Unit 1 Test Study Guide Flashcards
Write 0. 000 000 000 542 in scientific notation?
542 x 10^12
Write 5008 km in scientific notation
.5008 x 10^-4
What is the result of multiplying 2.5 10 by 3.5 10?
8750
Spongebob was trying to make Krabby Patties that weighed 12oz. He made 4 Krabby Patties. They all had the following weights: 12.12oz 11.9oz 12.2oz 12.1oz.
This is an example of Significant figures.
A class had a glass jar full of marbles. Each student guessed how many marbles the jar contained. Christina guessed 87 marbles and the jar had 88 marbles.
This is an example of Hypothesis.
Make your own example of a group of measurements that are precise.
Length of the stem of plants: 1.12cm, 2.32cm and .056cm
Make your own example of a group of measurements that are not precise.
Lengths of a pen: 2 and 1/3 of an inch
Make your own example of a group of measurements that are not accurate and not precise.
Length of a car: 24 inches and ¾ of an inch
How many significant figures are in the measurement 0.003415050 kg?
8 Significant Figures
Express the product of 232 km and 251.0 km using the correct number of significant digits.
200km and 250 km = 500000 km
Express the sum of 232.56 km and 251.2 km using the correct number of significant digits.
230 km and 250 km = 480 km
Round 171.009 m to four significant digits:
171.0
three significant digits:
171
two significant digits:
170
one significant digit:
200
What is the volume of an object measuring 2.44 x 10-3 by 1.44 x 10-2 by 8.5 x 10-2?
0.000298656
What is the main advantage of using the metric system over other systems of measurement?
You can have more precise and accurate answers.
What are the SI (metric) units of:
a. Mass- m
b. Length-cm
c. Volume- cm^3
d. Temperature- F or C
A substance boils at 259 K. What is the boiling point of this substance expressed in degrees Celsius?
.15 degrees Celsius
What is 0.0088 meters in centimeters?
.88 cm
What is the equation for density? (Write the words AND symbols)
Symbol is D for density, M for mass, and V for volume and its Density equals mass divided by volume
What is the density of an object having a mass of 18.0 g and a volume of 55 cm?
.327 cm
What is the volume of 45.6 g of silver if the density of silver is 10.5 g/mL?
4.34385
The mass of the electron is 9.10939kg. Round the mass to 1, 2, 3, and 4 significant figures.
10, 9.1, 9.11, 9.110
The density of osmium, which is the densest metal, is 22.57 g/cm. What is the mass of a block of osmium that measures 1.00 cm 4.00 cm 2.50 cm?
225.7
You are given a large irregularly shaped metal. Describe a method for determining the identity of the metal.
By weighing the mass and the volume, divide those and you get the density
A student measures a mass of 202.2 g, whereas the correct mass is 205 g. What is the percent error?
She/He did not round the mass
Scientific method-
A method of procedures where you do a systematic observation, measurement, and experiment, and the formulation, testing, and modification of hypotheses.
Hypothesis-
Where you make a statement without using an experiment to figure out it is true or false
Independent variable-
a variable that is changed or controlled.
Dependent variable-
variable that stays the same throughout the experiment
Accuracy-
How close to correctness your answer is
Precision-
How fined tuned your answer is
Error-
When the answer or ending is not correct or when an experiment fails through the work of the scientist making a mistake
significant figures-
are digits that carry meaning contributing to its measurement resolution
Absolute zero-
the lowest possible temperature where nothing could be colder and no heat energy remains in a substance
Kelvin-
A measurement of temperature
Density-
the result when you divide mass over volume
Weight-
How much mass an object has
