Chemistry, 23.08.2019 00:30 albattatasraap5wymy

Question 1
which of the following describes the treatment in an investigation?
a controlled test designed to answer a question or solve a problem
the factor that responds to a change
the factor that is kept constant
the factor that is changed in order to observe a response
question 2
which statement best describes an independent variable?
the variable that responds to change in an investigation
the variable you change in an investigation
the effect in a cause effect relationship
the factor that can never change in an investigation
question 3
liam did an investigation to see how water temperature affects the amount of salt that will dissolve in the water. he filled 4 beakers with exactly 100 milliliters of water each. he then heated each beaker to a different temperature and tested salt solubility at each different temperature. what was liam's independent variable?
amount of water in each beaker
the number of beakers
the amount of salt that dissolved in each beaker
the temperature of the water in each beaker
question 4
which of the following is an example of a treatment?
plants response to changes in temperature
changes made to the temperature of a greenhouse
the kind of soil the plants are in
question 5
jose is curious about which home remedy removes skunk smell from his dog. which of the following is a variable that must be kept constant?
how well the skunk smell is removed.
the home remedy used
the breed of dog
question 6
it is not important to make sure that all variables other than the independent variable are kept constant.
true false
question 7
in order to determine whether or not a substance is an acid or a base, you may stick your finger in the container and make your decision based on whether or not your finger feels slippery.
true false
question 8
a poison hazard symbol means your should not let chemicals contact your skin, ingest or inhale the substance.
true false
question 9
repeating an experiment is important because
you form a hypothesis
it proves the hypothesis is correct
it reduces the chance of error
question 10
when using repeated trials during a scientific investigation, scientists should find the average of their data for use in their final report.
true
false

Answers: 1

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Answers

Question 1Which of the following describes the treatment in an investigation?

the factor that is changed in order to observe a response

Question 2
Which statement best describes an independent variable?

The variable you change in an investigation

Question 3
Liam did an investigation to see how water temperature affects the amount of salt that will dissolve in the water. He filled 4 beakers with exactly 100 milliliters of water each. He then heated each beaker to a different temperature and tested salt solubility at each different temperature. What was Liam's independent variable?

the temperature of the water in each beaker

Question 4
Which of the following is an example of a treatment?

Changes made to the temperature of a greenhouse

Question 5
Jose is curious about which home remedy removes skunk smell from his dog. Which of the following is a variable that must be kept constant?

The home remedy used

Question 6
It is not important to make sure that all variables other than the independent variable are kept constant.

False

Question 7
In order to determine whether or not a substance is an acid or a base, you may stick your finger in the container and make your decision based on whether or not your finger feels slippery.
False

Question 8
A poison hazard symbol means your should not let chemicals contact your skin, ingest or inhale the substance.

True

Question 9
Repeating an experiment is important because

it reduces the chance of error

Question 10
When using repeated trials during a scientific investigation, scientists should find the average of their data for use in their final report.

True

Answer from: Quest

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence, the electronegativity (or the ability to attract electrons) is lessened."

Answer from: Quest

High-energy and unstable.

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