Chemistry, 16.10.2020 07:01 hiiliohi9433

Science investigation skills (I need to have 5 answers )

Answer 1.

Predict

Answer 2.

Use variable

Answer 3.

Plan and conduct investigations

Answer 4.
Draw conclusions

Answer 5.

Hypothesize

Answer 6.

Measure

Answer 7.

Classify and order

Answer 8.

Record and display data

Answer 9.

Use time and space relationships

Answer 10.

Use numbers

Answers: 2

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Answers

Answer from: alonnachambon

Explanation:

Choices

Predict

Use variable

Plan and conduct investigations

Hypothesize

Measure

Classify and order

Record and display data

Use time and space relationships

Use numbers

Selection:

These are in approximate order:

Hypothesize: Build an explanation of the observation. The hypothesis should be done after a thorough review of existing information. Library database searches and researcher interviews are suggested.Predict: prediction of what would happen if the explanation were correct. E.g., If an atom is homogenous and has no internal structure, then bombarding it with with neutrons will result in most neutrons going right through the atom, and none would be reflected backwards.

Plan and conduct investigations: Design experiments that test the hypothesis. E.g., see if any neutrons are reflected backwards. If they are, the hypothesis needs to be changed.

Measure: Do the work. Calibrate the equipment and record everything.

Record and display data: Publish the results and conclusions for peer review. Seek other's input in order to generate general agreement that the data, procedure, and conclusions are warranted.

===

Use numbers? Nah. Not if they are not required to reach a conclusion.(e.g., the precipitate will be pink or the reaction will stink).

Use Time and Space Relationships: Yes, but only if the hypothesis depends on them.

Classify and Order: OK, especially if you are a biologist, but not always necessary.

Use variable: usually, but what and how depends on the experiment.

Blame: Place blame on the lab partner (Just kidding).

Answer from: Quest

b. examine and describe cells

Answer from: Quest

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 : $4x (s) + 3o_{2} (g) \rightarrow 2x_{2}o_{3} (s) h rxn = -600 kj/mol$

equation 2 : $2x (s) + 3cl_{2} (g) \rightarrow 2xcl_{3} (s) h rxn = -800 kj/mol$

equation 3 : $4xcl_{3} (s) + 3o_{2} (g) \rightarrow 2x_{2}o_{3} (s) + 6cl_(2} h rxn = -200 kj/mol$

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 : $4xcl_{3} (s) \rightarrow 4x (s) + 6cl_{2} ( h rxn = (+800) \times 2 kj/mol$

let us add equation 1 & 4

$4x (s) + 3o_{2} (g) \rightarrow 2x_{2}o_{3} (s) h rxn = -600 kj/mol$

$4xcl_{3} (s) \rightarrow 4x (s) + 6cl_{2} ( h rxn = (+1600) kj/mol$

$4xcl_{3} )s) + 3o_{2} \rightarrow 2x_{2}o_{3} (s) + 6cl_{2} (g) h rxn = (+1000) kj/mol$

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

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Science investigation skills (I need to have 5 answers )

Answer 1.

Predict...

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