CHEMISTRY MIDDLE SCHOOL

A certain unknown compound burns with a violet flame. What metal is present in the unknown compound? What is the evidence?

Answers

Answer 1
Answer:

Answer:

Potassium Compounds.

Explanation:

Potassium compounds give a violet flame when heated in a flame; this can be viewed through a blue cobalt glass.

If you are not sure, try a known compound to see what the flame color looks like.

Be sure the wire is clean and fairly free from color before testing your unknown.

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What's the word called part of an experiment that changes to observe an outcome?

Answers

that is called the variable because it varies/changes in the experiment,

it's like x in algebra (with more than one placeholder), if it changes, it normally gives you a different result

The anticodon is the three-base code on the tRNA molecule that binds to the codon on mRNA. What is the associated codon for the anticodon CUA?The anticodon is the three-base code on the tRNA molecule that binds to the codon on mRNA. What is the associated codon for the anticodon CUG?

Answers

so it would be the complimentary base pairing, meaning that the codon must have been:
GAC
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It would be GAT for the first one and GAC for the second.

What is the mass of 4.38 x 10^24 formula units of sodium chloride (NaCl)?

Answers

Answer:

Mass = 427.05 g

Explanation:

Given data:

Formula units of sodium chloride = 4.38 ×10²⁴

Mass of NaCl = ?

Solution:

One mole contain formula units = 6.022 ×10²³

4.38×10²⁴ formula units × 1mol /6.022 ×10²³ formula units

0.73 ×10¹ mol

7.3 mol

Mass of NaCl:

Mass = number of moles × molar mass

Mass = 7.3 mol × 58.5 g/mol

Mass = 427.05 g

What are the main causes for seasons on earth?

Answers

As the earth turns one of the sides moves closer to the sun, creating summer in that area, at the same time the part of the earth on the other side moves farther away, hence making it colder and the season becomes winter
The tilt of the earth

Can you describe how mixtures relate to substances?

Answers

A substance in chemistry is a form of matter consisting having fixed chemical composition (like water). A mixture is a material made up of two or more substances (like water with sugar) - mixed, but not combined with chemical bonding.
A substance is a pure form of matter in which all the constituent particles are the same in their chemical nature, while a mixture is a combination of two or more substances. A substance cannot be separated into other kinds of matter by any physical process. But a mixture can be separated into pure substances  by appropriate separation techniques such as filteration, sedimentation, evaporation, crystallisation, etc..

Do lemonade dissolve in sand

Answers

the answer is no... :)
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