Week 1 Lab - Introduction to Science Question Set
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Week 1 Lab
: Introduction to Science Question Set (Use as Study Guide)
1.
Which of the following could NOT be revealed by experimental data?
The hazard warnings for the chemicals used in the experiment (the safety and hazard information for every chemical in an experiment should be looked up at read PRIOR to beginning the lab.)
2.
A general chemistry student performs an experiment in which two liquids are mixed and, as soon as they meet, a white solid forms in the solution. Which of the following is a qualitative observation that could be derived from the result from this experiment? Choose all that apply
.
The solid formed is white
The solid forms quickly after the liquids are mixed (both are qualitative
observations that could be derived from the result of this experiment)
3.
All of the following are general rules which should be followed during an experiment EXCEPT:
There must always be quantitative data
(CORRECT! This statement is not always true. The result of an experiment may be qualitative)
4.
Match the term with the best definition of the term.
Independent variable
– a variable in an experiment that is changed by the scientist and is used to construct a hypothesis
dependent variable
– a variable in an experiment whose value depends on that of another variable
control
– a factor in an experiment that could affect the results of the experiment but
do not reflect the planned changes
variable
– a defined, measurable component of an experiment
5.
True
or False
. Multiple independent variables can be tested in a single experiment.
False (if multiple variables are manipulated in an experiment, it is not clear
which variable causes the experimentally observed results)
6.
A study is being done to test the effects of habitat space on the size of fish populations. Aquariums of various sizes are set up with six goldfish in each one. Over a period of six months, the fish are fed the same type and amount of food. The aquariums are equally maintained and cleaned throughout the experiment. The temperature of the water is kept constant. At the end of the experiment the number of surviving fish are surveyed. What is the
independent variable
?
The sizes of the aquariums
7.
Suppose you conduct one experiment and find that the E = mc^3, rather than the
historically accepted formula E = mc^2. What should
you do next?
Repeat the exact same procedure
8.
Which of the following is NOT
a true statement about a “hypothesis?”
Scientists create hypotheses without considering existing data
9.
True
or False
. A testable hypothesis (or question) asks how the dependent variable has an effect on the independent variable.
False
10.When running an experiment, it is recommended that the experimenter conduct multiple trials. Select all the benefits of repeating trials in an experiment. Choose all that apply
.
A qualitative or quantitative conclusion can be drawn from the data
A scientist is able to determine rather the results of an experiment, as a whole, show consistency
A decision can be made whether the results support or contradict the
initial hypothesis
11. What does the prefix “
kilo
”- mean?
1000.0
12.Which of the following correctly
expresses 0.000000000172 in scientific notation?
1.72 X 10^-10
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Related Questions
The diagram shows the setup of an experiment. A few observations of the experiment are listed in the table below the diagram.
Experimental Observations
Observation
Description
1
Color of solution turned blue
2
Shiny hair like crystals deposited on the copper strip
Which of the following is the correct explanation for one of the given observations?
Observation 1 is a result of silver ions moving into the solution.
Observation 2 is a result of nitrate ions moving into the solution.
Observation 1 is a result of silver ions changing their oxidation state.
or Observation 2 is a result of silver ions changing their oxidation state.
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Can you please answer these and give me an explanation.
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1.
(answer the questions in the tan boxes in the tables below each question)
A student conducted an investigation to determine the effect of water temperature on
the amount of sugar that dissolves in a beaker of water. Identify components for trial 1
of this investigation.
Beaker
Number
1
2
3
4
Amount of
Water (mL)
100
100
100
100
Amount of Water (mL)
Trial 1
Temperature of Temperature of Amount of Sugar
Sugar (°C) Water (°C)
Dissolved (g)
20
20
20
20
Temperature of Sugar
5
10
15
20
185
189
194
204
Temperature of Water
Terms
Variable
Constant
Amount of Sugar Dissolved
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34
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1. Compare physical and chemical properties.
2. Why is it necessary to state the specific conditions by which an observation is made?
3. Suppose we have two pieces of same type of wood that are obviously different lengths. We then place both in water. It is observed that both piece floats. What makes length an extensive property?
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Suppose your instructor places a can of regular and diet cola in a large container filled with water. What might you expect happen based on the results of this experiment?
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1. Seawater is composed of salt, sand, and water. Is seawater a heterogenous mixture or homogenous mixture?
2. Suppose there are four unknowns in bottles: three of the bottles are solutions and one is a pure substance. How are you going to determine which of the unknown is a pure substance?
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A stock solution is one that has been prepared before the experiment.
Question 1 options:
True
False
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Please answer question 5 part A
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answer all
3.Which of these does NOT happen during a chemical change?
a. New substances are formed with different chemical properties.
b. Attractive force between atoms of molecule formed or break.
c. The chemical properties of the substances before and after the reaction are
the same
d. Energy is always released or absorbed.
4. A granular substance is added to a liquid. Which of the following would supply
evidence to propose a chemical change has taken place?
a. The granules dissolve completely.
c. The volume of the liquid increases.
b. The liquid gives off heat.
d. The granules become smaller.
5. Which of the following does NOT indicate a chemical change is occurring?
a. formation of precipitate
c. evolution of gas/bubbles
b. color change
d. phases of matter change
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please give a answer with explanation
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Posttest
Direction. Read the questions carefully. Write the letter of the correct answer.
1. Water exists in three states of matter and continuously moving through a cycle
on Earth. At which stage in the water cycle does water transform from a gas to a
liquid?
a.evaporation
c. precipitation
b. condensation
d. Sublimation
2.
Carbon dioxide (CO2) forms when coal burns in the presence of oxygen. Which
of the following is the BEST evidence that a chemical reaction occurs when the coal
burns?
a. Production of mechanical energy c. A new substance is produced
b. Production of electricity
d. Formation of precipitate
3.Which of these does NOT happen during a chemical change?
a. New substances are formed with different chemical properties.
b. Attractive force between atoms of molecule formed or break.
c. The chemical properties of the substances before and after the reaction are
the same
d. Energy is always released or absorbed.
4. A granular substance is added to a liquid. Which of the…
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Need all three plz
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I need help with all five questions
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Starting with question 2 up to question 4
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MODIFIED TRUE OR FALSE
Explain each underlined word why is true or false
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Name the following Fe(NO3)2
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1. what are the differences and similarities of "The Chemical Professional's Code of Conduct" with Good Laboratory Practices ?
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This isn't a graded question... please don't reject it and solve this on your own
Any help would be appreciated please
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8 - 14 please
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From part a : answer the question 4-8
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A laboratory technician needs 1.00 L of 0.125 mol/L sulfuric acid solution for a quantitative analysis experiment. A commercial stock of 5.00 mol/L sulfuric acid solution is available from a chemical supply company. How much sulfuric acid should the lab technician take from the stocK
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Epsom salt is a product that may be added to a bath to help ease sore muscles.
Epsom salt crystals
Epsom salt ground crystals
A materials scientist tested two forms of Epsom salt under different conditions to see which would dissolve the fastest.
The test information is displayed in this table.
Sample
Mass
Form
Water temperature
A
50 grams
ground crystals
30°C
B
100 grams
crystals
20°C
50 grams
100 grams
ground crystals
20°C
crystals
30°C
Which sample of Epsom salt would you expect to dissolve the fastest?
O A. A
В. В
ос. С
O D. D
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A pair of students were mixing aqueous chemical solutions in a the Classes of Chemical
Reactions lab experiment. They labeled their test tubes A, B and C. Which of the test
tubes showed a reaction?
A
B
All three test tubes reacted.
Test tube B reacted.
Test tube C reacted.
Test tubes A and B reacted.
Test tube A reacted
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A teacher tells students to describe physical properties of 10 mL of
vinegar and 10 mL of milk. When the students finish listing the physical
properties in their science notebooks, the teacher pours the vinegar and
milk into the same beaker. The students are surprised to see a white solid
substance form within the beaker as the two substances are combined.
13 What occurs within the beaker as the teacher mixes the vinegar and milk?
A A chemical change that produces a precipitate
B A physical change that creates a new substance
C A physical combination that produces a solid
D A corrosive reaction between two liquids
14 Before going to school, a student cuts a ripe apple into six slices and places them in a plastic
bag. During lunch, the student observes that the apple slices now have brown spots. Which of the
following indicates a chemical change in the apple?
F Cutting the apple into six slices
G Changing color of the apple
H Placing the slices in a plastic bag
J Removing brown spots…
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