Ch. 2 Clicker Review

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# Ch. 2 Clicker Review - PowerPoint PPT Presentation

Ch. 2 Clicker Review. 7th grade Mrs. Laubscher. Which of the following would you use to measure the mass of a flip flop?. 1. spring scale 2. a meniscus 3. a triple beam balance 4. graduated cylinder . The most important lab safety rule is. always wear safety goggles.

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### Ch. 2 Clicker Review

Mrs. Laubscher

1. spring scale

2. a meniscus

3. a triple beam balance

The most important lab safety rule is
• always wear safety goggles.
• always follow your teacher’s instructions and lab or textbook directions exactly.
• always wear an lab apron.
• Length, a metric ruler
• Time, seconds
• Volume, L x H x W or water displacement
Which of these is incorrect?
• Mass = grams
• Weight = newtons
• Length = meters
• Volume = g/cm3
Which of these is incorrect?
• 5 kg = 5000 g
• 2 L = 2000 mL
• 3 m = 30 cm
• 10 decigrams = 1 g
Which of these is correct?
• Boiling point is 100 degrees Celsius.
• Freezing point is 0 degrees Fahrenheit.
• Boiling point is 273 degrees Kelvin.
• Freezing point is 0 degrees Kelvin.

If the data collected when measuring your dog’s tail was 27 cm, 36 cm, 25 cm, and 39 cm and the actual value was 30 cm, you could conclude that your data was. . .

• Accurate and precise
• Accurate but not precise
• Precise but not accurate
• Neither accurate nor precise.
If the data collected for the temperature outside for this week was 82o, 78o, 15o, 75o, and 83o, we would say that the 15o is
• anomalous data.
• a significant figure.
• an estimate.
• a percent error.
For which of the following would the millimeter be the most appropriate unit of measure?
• The length of a belt.
• The height of a bee.
• The distance from Chesterland to Mayfield.
• The density of a pin.
What does it most likely mean if a graph shows no identifiable trends?
• There are more than two variables.
• There is a strong relationship between the variables.
• The graph has no use or value.
• There is no relationship between the variables.
• precision
• significant figures
• estimation
• anomalous data
To determine how close to the true value an experimental value is, you would use
• percent error
• precision
• significant figures
• accuracy
A line graph in which the data points fall along a straight line is called a
• linear graph.
• anomalous graph.
• nonlinear graph.
• a faulty graph.
What is the first thing you should do if an accident occurs in your classroom?
• Start first aid treatment.
• Find the emergency equipment.
• Call 911.
The difference between the greatest and least number in a data set is called the . . .
• Percent error
• Median
• Mode
• Range
• Mean
• Median
• Mode
• Range
The middle number in a set of data when arranged from greatest to least.
• Mean
• Median
• Mode
• Significant figure
To calculate the density of an object, you would
• Multiply L x W x H
• Divide volume by mass.
• Multiply weight x volume.
• Divide mass by volume.
Which of these prefixes is correct?
• Deka = 100
• Hecto = 10
• Milli = 1/100
• Kilo = 1000
Mass and weight are different on the Moon because
• mass measures the force of gravity on an object.
• weight measures the amount of matter an object contains.
• weight measures the force of gravity on an object.
• mass measures the space an object takes up.
The official SI unit of temperature is
• Fahrenheit
• Kelvin
• Celsius
• The boiling point of water.
The closeness of a measurement to its true value is its
• precision
• percent error
• accuracy
• significant figure
A line graph shows
• what variables were controlled in an experiment
• how the dependent variable changes in response to the independent variable.
• the input, process and output of a system
• changes in the independent variable
• 5 g/cm3
• 45 g/ml
• .2 g/cm3
• .2 g/ml
Objects that have a density ___ 1.0 g/cm3 will ____.
• Less than, sink
• Greater than, float
• Equal to, sink
• Less than, float
The significant figures in a measurement include
• the digits that have been measured exactly, plus one digit whose value has been estimated.
• only the digits that have been measured exactly.
• only the digit whose value has been estimated.
• only zeroes that are after the decimal point.
• What is its volume?

Hint: experimental –actual x 100%

actual

Why are line graphs said to be powerful tools?
• They show how different sets of data are related.
• They are easier to make than bar graphs.
• They can show both numerical and categorical data.
After you have completed a lab investigation you should do all of the following except
• turn off, unplug, and return any equipment to its proper place.
• pour all liquid wastes down the sink drain.
• clean up your work area.
• Kg/m3
• g/cm3
• ml
• cm3
Scientists have developed models for the structure of molecules because
• molecules move to fast.
• molecules are hazardous.
• molecules are too small.
• molecules are too far away.
For which of the following would the kilometer be the most appropriate unit of measure?
• The distance from Solon to Chesterland.
• The length of a car.
• The length of a nail.
• The weight of a jet plane.
If you spill a chemical on your skin, after notifying your teacher, you should
• cover the spill with a dressing.
• flush the skin with large amounts of water.
• go to the emergency room.
• apply an ice pack.

In a home central heating system, when the room temperature measured by the thermostat reaches a set value, the thermostat switches off the heater. This action by the thermostat is an example of

• feedback
• process
• output
• input
Scientists use which of the following to examine models of complex systems?
• simple models
• graphs
• diagrams
• computer programs