Sem 1- 6 week (1) Flashcards
Long hair should be tied back when working in a lab because
a) it is in style
b) it could catch on fire
c) It looks neater
d) you will stay cooler
b) it could catch on fire
The proper method for making an acid solution is
a) to slowly add acid to water
b) to slowly add water to acid
c) to use a large bottle of acid
d) to add equal parts of acid and water at the same time
a) to slowly add acid to water
When heating chemicals, remember to do all of the following EXCEPT:
a) point the mouth of the container away from people
b) roll up long sleeves
c) tie long hair back
d) seal the container
d) seal the container
Which of the following is NOT a good lab practice?
a) clean up work area during and after lab procedure
b) read and understand the lab prcedures before beginning the lab
c) once heated, leave chemicals to go to the restroom
d) wear goggles at all times during the experiment
c) once heated, leave chemicals to go to the restroom
All equipment for an experiment should be:
a) placed as far away from the edge as conveniently possible
b) placed on top of books or other personal items to conserve space
c) placed near the edge of the work space so you may reach it easily
d) lefft out for someone else to clean
a) placed as far away from the edge as conveniently possible
When handling hot containers, you must use caution because:
a) you will have to pay for anything that breaks
b) hot glass and cold glass look the same
c) hot containers will scorch the countertops
d) chemicals may explode
b) hot glass and cold glass look the same
All of the following are good lab techniques EXCEPT:
a) when noting the odor of a chemical, waft the vapors towards the nose
b) label all containers before filling them with a solution or solid
c) when inserting glass tubing into a rubber stopper, lubricate the tubing first
d) pour all chemicals down the drain
d) pour all chemicals down the drain
Which of the following would be a plausible next move if a scientist’s repeated experiments did not support his hypothesis?
a) Tamper with the experimental results so that the hypothesis was supported.
b) Change the scientific hypothesis into a theory.
c) Change the hypothesis and conduct a new experiment
d) Keep repeating the experiment until the hypothesis is supported.
c) Change the hypothesis and conduct a new experiment
Why can a scientific hypothesis never be completely proven true?
a) A scientific hypothesis is inaccurate.
b) Supporting evidence is difficult to find.
c) New evidence might become available that contradicts a scientific hypothesis.
d) It is impossible to design an experiment that can directly test a scientific hypothesis.
c) New evidence might become available that contradicts a scientific hypothesis.
Which best defines a scientific theory?
a) a well-established, highly-reliable explanation of a natural event.
b) a preliminary guess or idea about an event in nature
c) a true statement about an event in nature
d) a well-established principle that does not include and explanation
a) a well-established, highly-reliable explanation of a natural event.
When would an established scientific theory most likely be revised or replaced?
a) When one scientist argues against a theory
b) When general public opinion disagrees with the theory
c) When new information is gathered that does not support the current theory.
d) When the theory is promoted into a law.
c) When new information is gathered that does not support the current theory.
Which of the following statements would be the hypothesis most easily tested?
a) All organisms are made of cells
b) Oak trees grow tallest between temperatures of 10 and 40 degrees Celcius.
c) An invertebrate is an animal without a backbone or an internal skeleton
d) If life were to exist on another planet, that life would also be composed of carbon compounds.
b) Oak trees grow tallest between temperatures of 10 and 40 degrees Celcius.
Which of the following statements is the best definition of a scientific hypothesis?
a) a suspicion or hunch about an event in nature
b) a proposal that can be tested in an experiment
c) an idea or explanation that most people agree with
d) a well-supported explanation for a broad set of observations
b) a proposal that can be tested in an experiment
Suppose you were to read about a scientific statement based on data from hundreds of years of research and observation that applies to a broad set of naturally occurring events. Would you consider it a hypothesis or a theory?
a) hypothesis
b) theory
c) both
d) neither
b) theory
Which of these hypothesis would be most easily tested?
a) Green, healthy plants are the most attractive.
b) If the weather is cold, people feel more sick.
c) If acetic acid is added to a mold colony, the colony will be reduced in size.
d) Every plant cell has a cell wall, while every animal cell lacks a cell wall.
c) If acetic acid is added to a mold colony, the colony will be reduced in size.
Which of the following does not represent a limitation of science?
a) Science cannot resolve questions of meaning.
b) Science cannot resolve questions of value.
c) Science cannot test observations about the natural world.
d) Science cannot prove a theory to be absolute truth.
c) Science cannot test observations about the natural world.
Which of the following can science be used to investigate?
a) values
b) opinions
c) supernatural beings
d) nature
d) nature
Which tool would be used to most accurately measure the volume for a liquid? a) Graduated cylinder b) Beaker c) Erlenmyer Flask D) Cup
a) Graduated cylinder
How many significant figures are in the following number: 0.0105
Designate which digits are significant by bolding them.
There are 3 significant digits
0.0(105)
Which of the following units are not paired correctly?
a) Liter (L) - Mass
b) Newton (N) - Force
c) Pascal (P) - Pressure
d) Joule (J) - Work
a) Liter (L) - Mass
Based on the given information, determine if the data are accurate and precise, given an actual true value of 10.9mL?
Trial A
Volume (mL)
1
11.0
2
10.9
3
11.1
4
10.8
Both accurate and precise
Accurare only
Precise only
Neither accurate nor precise
Both accurate and precise
What is 0.80136 expressed with four significant figures?
- 801
- 8014
- 800
- 80136
0.8014
What is the correct standard notation for 4.5 x 10-4? 45,000 45 0.00045 0.000045
0.00045
What type of change is boiling water? Physical Static Chemical Nuclear
Physical
The state of matter that has an indefinite volume, and is compressible is; Solid Liquid Gas Both Solid and Liquid
Gas
What type of change is photosynthesis? Physical Static Nuclear Chemical
Chemical
The air inside of a hot air balloon is heated. The balloon slowly expands until the entire balloon lifts off the ground. What type of change is this? Nuclear Physical Static Chemical
Physical
A specific property can only be tested by changing the molecular composition of a sample. What type of change is this? Physical Chemical Nuclear Static
Chemical
The state of matter that is incompressible with an indefinite shape is; Solid Liquid Gas Both Solid and Liquid
Liquid
Which of the following properties can be listed as a physical property?
Reacting metal with acid
Freezing point of water is 32° F
Decomposition is rapid under gentle heat
Rusting
Freezing point of water is 32° F
Pick the answer choices that best complete the following sentence
A ____________ change is observed when a substance is modified, but the molecular composition remains consistent. This type of change helps identify _________ properties of that substance.
physical, chemical
chemical, physical
physical, physical
chemical, chemical
physical, physical
If the volume of a substance could be changed, and the molecules could be squished together, we would label this as; Definite, compressible Definite, incompressible Indefinite, compressible Indefinite, incompressible
Indefinite, compressible
What state of matter is incompressible, and has a definite shape? Solid Liquid Gas Both Solid and Gas
Solid
Goggles should be worn at all times when performing a lab.
True
False
True
When performing an experiment, is it ok to start mixing chemicals randomly to see what will happen? Please answer “yes” or “no”.
Yes
No
No
In order to properly dilute a concentrated acid, you should always add _____ to ______, not the other way around.
When diluting an acid, or a strong chemical, you should always pour the acid into the water, not the other way around.
In order to properly test the odor of chemicals in the lab, you should use the technique known as ____________.
Never inhale a fume directly from its container. You should always waft fumes in your direction to investigate odor.
True or False: It is permissible to wear sandals in the lab area as long as you aren’t handling any glassware.
True
False
False
Which of the following would you use to rinse chemical spills from your clothing?
a) fire blanket
b) safety shower
c) eyewash station
d) first aid kit
b) safety shower
On a MSDS diamond, which of the following reactivity ratings would indicate a substance is unstable if heated?
a) Blue Diamond 3
b) Red Diamond 2
c) Yellow Diamond 1
d) Any Diamond 0
c) Yellow Diamond 1
The MSDS is included with all chemical shipments and describes the safety precautions and proper disposal of the chemicals. MSDS stands for _________________.
MSDS stands for Material Safety Data Sheet.
Which of the following statements about science is true?
- Science is a flexible pursuit of truth.
- Science can answer almost any question imaginable.
- Science follows rules and procedures to answer questions.
- Science is a branch of philosophy interested in proving facts.
Science follows rules and procedures to answer questions.
Is the following statement true or false and why: the main goal of Science is to provide an understanding of the world that can be continuously refined and updated as we gain more knowledge.
- True, because science can be refined or updated once a conclusion is made.
- False, because science cannot be refined or updated once a conclusion is made.
- True, because science seeks to find absolute truth.
- False, because science seeks to find absolute truth.
True, because science can be refined or updated once a conclusion is made.
Science is based on observations that can be _____________.
tested
It takes _______ new experiment(s) to disprove a currently accepted theory.
One
Which of the following statements can science test?
- Two story houses heat up faster in direct sunlight compared to one story houses.
- Two story houses look better from the street than one story houses.
- Two story houses tend to be haunted more often than one story houses.
- Living in a two story house makes people feel taller than living in a one story house.
Two story houses heat up faster in direct sunlight compared to one story houses.
Which of the following is not a step in the scientific process?
- Report the results
- Make a product based on your conclusion
- Formulate and Test the Hypothesis
- Make an observation or question
Make a product based on your conclusion
Which of the following is not a characteristic of a good hypothesis?
- Specific
- Testable
- Realistic
- True
True
What happens when a Scientist’s original hypothesis is proved incorrect?
- Theories or conclusions are amended to agree with new data.
- Their experiments are thrown out and discredited.
- The scientific community ignores all of their research.
- The experiment that disproved the hypothesis is ignored and discredited.
Theories or conclusions are amended to agree with new data.
Which of the following is the primary characteristic that theories have that hypotheses do not?
- They have been extensively tested and accepted.
- They are questions or statements that are testable.
- They are based on observations of the natural world.
- They are predictions that can be used to form experiments.
They have been extensively tested and accepted.
True or False: A Theory can and should be modified many times as new information comes available.
True
False
True
Which would measure time with the most precision: a stopwatch measuring hundredths of a second or a wristwatch with a second hand?
stopwatch
wristwatch
stopwatch
