S1 Particle Diagrams
True or false: Students should include both system and surroundings in particle diagrams.
False! Only the system
The object is blue, rough, and squishy. Is this qualitative or quantitative data?
qualitative data
The variable we manipulate in an experiment is the:
Independent variable
How many sig figs are in these numbers:
100
100.0
100.010
1
4
6
What is a particle?
A simple representation of matter
What is the U shape liquid creates in glassware called?
meniscus
Data found outside of the data set in a graph is referred to as ___________ data
extrapolated
Put these numbers into scientific notation or standard form
1.20x105
0.0090
120000
9.0 x10-3
The liquid inside of the glass is clear so it is water. Is this an observation or an inference?
Inference
A student's measurements for the length of an object are 15.6g, 17.8g, 16.0g, and 16.5g. His average is 16.5 g.
The actual length of the object is 16.56g. Is his data accurate, precise, both, or neither?
Accurate but not precise
A student wants to determine the relationship between amount of sunlight and plant growth height. Identify the Independent and Dependent variables
IV- sunlight
DV- growth height
120.0 (1 sig fig)
0.002560 (2 sig figs)
100
0.0026
A student was asked to measure how much time it takes sodium chloride to dissolve in water. He used an electronic balance to measure out 10g of NaCl, and a graduated cylinder to measure 20mL of water. He then added the water and NaCl to a clean beaker and timed how long it took to dissolve. Identify the system.
The NaCl (salt) and water
How many sig figs are in these numbers?
6.500g
150,000 mL
0.000001780 g
4
2
4
An equation of a line for a graph is determined to be y=(4.5g/mL)x + 0
What will the mass be if the volume is 46.7mL?
210 g
Perform the following calculations, rounding your answer to the correct number of sig figs:
410g x 5.00g =
(6.7x10-2mL) x (8.00 x 1011g) =
2100 g2
5.4 x 1010mL/g
Draw a particle diagram of this lab: A student added 25g magnesium chloride to 20mL of water. When weighed together after dissolving, he found the total mass of the system to be 45 g.
Answers will vary
A student was asked determine how long it takes 10.0g of sugar to dissolve in 25.0mL of water. Create a materials list and procedure for this experiment.
Answers will vary
The equation of a line is found to be
y=(5.0g/mL)x+0
What will be the volume if the mass is found to be 600.0g?
120mL
Perform the following calculations, rounding your answer to the appropriate number of sig figs:
56g + 15.60g =
7.00mL -0.100mL =
72g
6.90mL