Review For Test #1
Review and practice for your Chemistry Test #1. If you miss something, include the information in your notes to help you remember.
Questions and Answers
- 1.
Whichof the following words isclosest in meaning to the word concept?
- A.
Plan
- B.
Question
- C.
Idea
- D.
Solution
Correct Answer
C. IdeaExplanation
The word "concept" refers to an abstract or general idea or notion. In this context, the word "idea" is the closest in meaning to "concept" as it also represents a general or abstract thought. A plan is a specific course of action, a question is an inquiry, and a solution is a resolution to a problem, so they are not as closely related to the meaning of "concept" as the word "idea" is.Rate this question:
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- 2.
In the sentence, "Scientists include both constant and changing parameters in their experiments," what doe the word parameter mean?
- A.
Rules, limits or boundaries
- B.
Value used to dfine something
- C.
Environment of surroundings
- D.
Procedure in an experiment
Correct Answer
A. Rules, limits or boundariesExplanation
The word "parameter" in the sentence refers to rules, limits, or boundaries. In scientific experiments, scientists include both constant and changing parameters, which means they establish certain rules or limits that define the conditions under which the experiment is conducted. These parameters help ensure that the experiment is conducted in a controlled and consistent manner, allowing for accurate observations and conclusions to be drawn.Rate this question:
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- 3.
What is the first step you should take if someone is cut with broken glass during an experiment?
- A.
Apply first aid
- B.
Clean up the class
- C.
Complete the experiment
- D.
Make sure you are safe
Correct Answer
D. Make sure you are safeExplanation
The first step you should take if someone is cut with broken glass during an experiment is to make sure you are safe. This means assessing the situation and ensuring that there are no immediate dangers or hazards that could harm you or the injured person further. It is important to prioritize your safety before providing any assistance or first aid to the injured individual.Rate this question:
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- 4.
What tool might a scientist use for an experiment about the mass of objects?
- A.
Graduated cylinder
- B.
Celcius thermometer
- C.
Electronic scale
- D.
Meterstick
Correct Answer
C. Electronic scaleExplanation
A scientist would use an electronic scale for an experiment about the mass of objects. An electronic scale is a precise and accurate tool that can measure the weight of objects in grams or kilograms. It provides a digital reading, making it easier for scientists to record and analyze data. Graduated cylinders are used to measure volume, Celsius thermometers measure temperature, and metersticks measure length, so they would not be suitable tools for measuring mass.Rate this question:
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- 5.
Which of the following should be avoided in the area where an experiment is taking place?
- A.
Tying long hair back in a ponytail
- B.
Keeping information from previous experiments on the work area
- C.
Wearing safety goggles that fit snugly over your eyes
- D.
Wearing heat-resistant gloves if an open flame is used
Correct Answer
B. Keeping information from previous experiments on the work areaExplanation
Keeping information from previous experiments on the work area should be avoided in the area where an experiment is taking place. This is because having previous experiment information on the work area can lead to confusion, mix-ups, and potential errors. It is important to have a clean and organized work area to ensure accurate and reliable results.Rate this question:
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- 6.
What is the density of an object with a mass of 100.8 g and a volume of 144 cm3?
- A.
700 g/cm3
- B.
70 g/cm3
- C.
7 g/cm3
- D.
0.7 g/cm3
Correct Answer
D. 0.7 g/cm3Explanation
The density of an object is calculated by dividing its mass by its volume. In this case, the mass of the object is given as 100.8 g and the volume is given as 144 cm3. Dividing the mass by the volume gives us a density of 0.7 g/cm3.Rate this question:
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- 7.
What is the density of an object with a mass of 89.5 g and a volume of 75.1 mL?
- A.
1.0 g/mL
- B.
1.19 g/mL
- C.
2.19 g/mL
- D.
6721.45 g/mL
Correct Answer
B. 1.19 g/mLExplanation
The density of an object is calculated by dividing its mass by its volume. In this case, the mass of the object is 89.5 g and the volume is 75.1 mL. Dividing the mass by the volume gives us a density of 1.19 g/mL.Rate this question:
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- 8.
When a prefix is put in front of a base unit in the metric system, what does the prefix do to the base unit?
Correct Answer
Change the size of the unit
Make the unit bigger or smallerExplanation
When a prefix is added to a base unit in the metric system, it modifies the size of the unit. The prefix can either increase or decrease the size of the base unit, making it bigger or smaller. The prefix acts as a multiplier or divisor, indicating a multiple or fraction of the base unit. This allows for easier representation and conversion of measurements within the metric system.Rate this question:
- 9.
What does the prefix "c" mean in the metric system?
Correct Answer
centi, 100xExplanation
The prefix "c" in the metric system denotes the unit "centi" which means one hundredth or 1/100th. Therefore, when "c" is used as a prefix, it signifies that the value is multiplied by 100.Rate this question:
- 10.
How many mm long is a line that measures 18 cm?
Correct Answer
180 mmExplanation
A line that measures 18 cm is equivalent to 180 mm because there are 10 millimeters in 1 centimeter. Therefore, to convert centimeters to millimeters, we multiply the given measurement by 10. In this case, 18 cm multiplied by 10 equals 180 mm.Rate this question:
- 11.
Convert: 23.98 hm into _____________ mm
Correct Answer
2,398,000. mmExplanation
The question asks to convert 23.98 hm (hectometers) into millimeters. To do this, we need to multiply the given value by a conversion factor. Since there are 10 decimeters in a meter, 100 meters in a hectometer, and 1000 millimeters in a meter, the conversion factor is 10 * 100 * 1000 = 1,000,000. Multiplying 23.98 hm by the conversion factor gives us 2,398,000 mm.Rate this question:
- 12.
Convert: 72.9 g into _____________kg
Correct Answer
.0729 kgExplanation
To convert grams to kilograms, we need to divide the given value by 1000 since there are 1000 grams in a kilogram. Therefore, 72.9 grams is equal to 72.9/1000 = 0.0729 kilograms.Rate this question:
- 13.
What unit do we use to measure the speed of a bicycle?
Correct Answer
m/s or km/hExplanation
We use meters per second (m/s) or kilometers per hour (km/h) to measure the speed of a bicycle. These units are commonly used to quantify the rate at which an object, in this case, a bicycle, is moving. Meters per second is a standard unit in the International System of Units (SI), while kilometers per hour is a commonly used unit for measuring speed in everyday life. Both units provide a clear measurement of how fast the bicycle is traveling.Rate this question:
- 14.
Measurements that have good accuracy and good precision are called ________________ by scientists.
Correct Answer
good dataExplanation
Scientists refer to measurements that have good accuracy and good precision as "good data". Accuracy refers to how close a measurement is to the true or accepted value, while precision refers to how close multiple measurements of the same quantity are to each other. When both accuracy and precision are high, scientists consider the measurements to be reliable and of good quality, hence the term "good data".Rate this question:
- 15.
A __________ is a way to represent an object or a system to help us understand somehing that is not familiar to us.
Correct Answer
modelExplanation
A model is a representation of an object or system that aids in our understanding of something that is unfamiliar to us. Models can be physical, such as a scale model of a building, or conceptual, such as a mathematical model used to predict weather patterns. By studying and analyzing models, we can gain insights and make predictions about the real-world objects or systems they represent. Models are valuable tools in fields such as science, engineering, and economics, helping us to comprehend complex concepts and phenomena.Rate this question:
- 16.
In science, a ____________ is an explanation that combines many hypotheses and observations. (e.g. gravity)
Correct Answer
TheoryExplanation
In science, a theory is an explanation that combines many hypotheses and observations. It is a well-substantiated explanation that has been repeatedly tested and confirmed through experimentation and observation. Theories are the highest level of scientific understanding and provide a framework for further research and investigation. They are based on a large body of evidence and are widely accepted within the scientific community. Theories can be used to make predictions and guide future scientific endeavors.Rate this question:
- 17.
Only when a model correctly predicts the results of many different experiements can a ______ be constructed to summarize results and obervations of many experiements. It tells how things work.
Correct Answer
lawExplanation
When a model consistently predicts the outcomes of various experiments, it provides a basis for constructing a law that summarizes the results and observations of those experiments. A law is a scientific principle or rule that describes how things work in a particular context. It represents a generalization or pattern that has been observed and verified through multiple experiments, allowing scientists to understand and explain the underlying mechanisms or relationships involved.Rate this question:
- 18.
In science, measuring the L x W x H helps you find the _____________ of an object.
Correct Answer
VolumeExplanation
Measuring the length, width, and height of an object allows us to calculate its volume. Volume is a measurement of the amount of space occupied by an object. By multiplying the length, width, and height, we can determine the total volume of the object.Rate this question:
- 19.
Why did scientist agree to use the SI measurement units worldwide instead of the units common at each of their own locations?
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