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Verdich [7]
3 years ago
9

Classify each of the following pure substances as an element or a compound. a. helium gas (He) b. mercury (Hg) in a thermometer

c. sugar (C12H22O11) d. sulfur (S) e. lye (NaOH)
Chemistry
1 answer:
olga nikolaevna [1]3 years ago
4 0

Answer:

A. Element

B. Element

C. Compound

D. Element

E. Compound

Explanation:

A, B, and D are elements while C and E are compounds. The three are elements backside basically they are yet to bond with any other element to form a compound.

Although the mercury is in glass, this doesn’t change the fact that it is an element. Being in glass does not affect the independence it enjoys as an element. This serves to mean that even elements can be useful in their elemental states and this does not affect their initial state. They still remain as elements even if they are in a particular confinement.

The other two I.e lye and sugar are compounds as they contain more than one element which are mixed together in appropriate volume

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Made up of the protons and neutrons, this part or the atom contains nearly all the mass of the atom
Sonja [21]

Answer:

The nucleus

Explanation:

3 0
3 years ago
If you refuse a legal chemical test issued by a law enforcement officer, the Division of Motor Vehicles is required to:
Andru [333]

Answer: Revoke the driver's license for at least 12 months

Explanation:

Chemical tests are used in order to measure the amount of drugs or alcohol that is in the body of a person when the person was arrested. To do this, samples of the urine or blood of the person can be taken and the result will be used to know if the person was driving under the influence of alcohol or not.

If the person refuse a legal chemical test issued by a law enforcement officer, the Division of Motor Vehicles is required to revoke the the driver's license of the person for at least 12 months.

6 0
2 years ago
SOMEONE PLS HELP ME ITS URGENT
Simora [160]

If copper is heated with iron oxide there is no obvious reaction because

copper is less reactive than iron.

On a reactivity chart, copper is far below iron. This makes it impossible for a replacement reaction to occur, so the equation doesn't change.

I hope I helped!

5 0
3 years ago
Read 2 more answers
how many ml of a 22.5% (v/v) ethanol solution would you need to measure out in order to have 12.5 ml of ethanol ?
Aleks [24]
Volume percent<span> or </span>volume/volume percent<span> (v/v%) is used when preparing solutions of liquids. It will have units of volume of the smaller composition substance over the volume of the solution. We calculate as follows:

12.5 mL ethanol = .225 mL ethanol / 1 mL solution ( V )
V = 55.56 mL of the 22.5 % by volume ethanol solution is needed

Hope this answers the question.</span>
8 0
3 years ago
A graduated cylinder was filled with 25.0 mL of water. A solid object was immersed in the cylinder, raising the water level to 3
yawa3891 [41]

Answer:

Density of the object is 8759.494 grams/L

Explanation:

As we know density of an object is mass of the object divided by its volume

Given

Volume of the object is equal to the change in volume of water with in the cylinder when the object was immersed in water.

Hence, volume of object is equal to

32.9 -25 = 7.9 mL

Mass of the object is 69.2 grams

Density

= \frac{69.2}{7.9 *10^{-3}}\\= 8759.494 grams/L

Density of the object is 8759.494 grams/L

7 0
3 years ago
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