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3 years ago

Question 1

1 answer:

4 0

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

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Given an unknown mixture consisting of two substances, explain how a scientist could use lab techniques to determine whether the

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3 years ago

Consider the graph below. Which phase change is most likely taking place in this graph? a gas to a liquid a liquid to a solid a

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A solid to a liquid

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2 years ago

It would take one light year to travel to the sun true or false?

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True! I’m pretty sure

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2 years ago

Copper(II) sulfide is formed when copper and sulfur are heated together. In this reaction,

storchak [24]

Answer:

The mass of copper(II) sulfide formed is:

= 81.24 g

Explanation:

The Balanced chemical equation for this reaction is :

$Cu(s) + S\rightarrow CuS$

given mass= 54 g

Molar mass of Cu = 63.55 g/mol

$Moles = \frac{given\ mass}{Molar\ mass}$

$moles=\frac{54}{63.55}$

Moles of Cu = 0.8497 mol

Given mass = 42 g

Molar mass of S = 32.06 g/mol

$Moles = \frac{given\ mass}{Molar\ mass}$

$moles=\frac{42}{32.06}$

Moles of S = 1.31 mol

Limiting Reagent : The reagent which is present in less amount and consumed in a reaction

First find the limiting reagent :

$Cu + S\rightarrow CuS$

1 mol of Cu require = 1 mol of S

0.8497 mol of Cu should require = 1 x 0.8497 mol

= 0.8497 mol of S

S present in the reaction Medium = 1.31 mol

S Required = 0.8497 mol

S is present in excess and Cu is limiting reagent

All Cu is consumed in the reaction

Amount Cu will decide the amount of CuS formed

$Cu + S\rightarrow CuS$

1 mole of Cu gives = 1 mole of Copper sulfide

0.8497 mol of Cu = 1 x 0.8497 mole of Copper sulfide

= 0.8497

Molar mass of CuS = 95.611 g/mol

$Moles = \frac{given\ mass}{Molar\ mass}$

$0.8497 = \frac{given\ mass}{95.611}$

Mass of CuS = 0.8497 x 95.611

= 81.24 g

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3 years ago

Academic Vocabulary The schools in one area are

alexandr402 [8]

Explanation:

Standards.

Assessments.

Accountability.

Professional Development.

School Autonomy.

Parent Involvement.

Learning Readiness.

Technology.

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3 years ago