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aivan3 [116]
3 years ago
11

What was alchemy?

Chemistry
2 answers:
stira [4]3 years ago
8 0

Answer:

D

Explanation:

its a very old study and philosophy of how to change basic substances such as metals into other substances

marusya05 [52]3 years ago
7 0
Im not completely sure on this but i think it would be C because it was a thing of the past
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You need to measure the brightness of a light bulb using the metric system. In which unit do you express your measurement?
kherson [118]
Candela is the correct answer. In measuring the brightness or luminosity of the bulb and you want to use the metric system, candela is the unit to be used. You are correct that candela is the unit of light intensity. The term candela is the Latin for candle which signifies light.<span> </span>
7 0
4 years ago
How hydrogen gas help to make vegetable ghee​
vladimir1956 [14]

Answer:

The vegetable oils are liquid at room temperature. They contain double bonds. During hydrogenation double bonds break hydrogen is introduced and form vegetable ghee.

Explanation:

Hydrogenation:

It is the chemical process in which hydrogen is introduced in unsaturated hydrocarbons in the presence of catalyst Ni.

Simple hydrogenation reaction:

H₂C = CH₂ + H₂    →     CH₃-CH₃

                            Ni

Hydrogenation is used on industrial level in  the production of vegetable ghee.

The unsaturated hydrocarbons, fatty acids undergoes hydrogenation and form ghee.

The vegetable oils are liquid at room temperature. They contain double bonds. During hydrogenation double bonds break hydrogen is introduced and form vegetable ghee.

4 0
3 years ago
Sarah is writing a paper explaining protein formation. Choose the correct way to complete each sentence.
Amanda [17]

Answer :

Amino acids join by forming (1) peptide bonds.  Water is released.

The chains of amino acids vary according to their (2) side chains, which each have differing makeup.  

These chains determine the protein’s structure and they fold to create a unique (3) third-dimensional shape.

Explanation :

Amino acid : The amino acids are the building blocks of protein. Amino acids are the compound which consist both amine (-NH_2) and carboxylic (-COOH) groups along with the side chains. In the protein, many amino acids are linked by the peptide bonds.

Th peptide bonds are formed by the combining of amino group of one amino acid to the carboxylic group of another amino acid by releasing of water.

Some examples of amino acids are glycine, lysine, alanine, etc.

Peptide bond formation image is shown below.

In the image 'R' can be contained by different groups like hydrogen, methyl, phenyl, etc

8 0
3 years ago
Claim: If I brush my teeth everyday, then I won't get cavities.
Rom4ik [11]
The dependent variable is i won’t get cavities
4 0
4 years ago
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Why is it necessary to know the temperature of the reactants and the products of a reaction in order to determine change in the
Crank

Answer:

Free Energy (G) can either increase or decrease for a reaction when the temperature increases. It depends on the entropy (S) change. The change in a quantity is represented by the Greek letter delta. ... Hence, when the temperature increases the numeric value of the free energy becomes larger.

Explanation:

6 0
3 years ago
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