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likoan [24]
4 years ago
6

Which of the following is a compound? A brass, B rust, C iron, D steel. please explain

Chemistry
2 answers:
iren [92.7K]4 years ago
6 0
B is the correct answer from my understandings
slava [35]4 years ago
5 0
Brass is a metal alloy<span> made of </span>copper<span> and </span><span>zinc, so B.

</span>
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An emerald gemstone is an impure form of the mineral beryl, Be3Al2Si16O18. What is the percentage of silicon in the mineral?
solong [7]

Answer:

b. 54.9%

Explanation:

An emerald gemstone has the formula Be₃Al₂Si₁₆O₁₈. We can find the mass of each element in 1 mole of Be₃Al₂Si₁₆O₁₈ by multiplying the molar mass of the element by its atomicity.

Be: 3 × 9.01 g = 27.03 g

Al: 2 × 26.98 g = 53.96 g

Si: 16 × 28.09 g = 449.4 g

O: 18 × 16.00 g = 288.0 g

Total mass = 818.4 g

The mass percentage of silicon is:

(449.4 g / 818.4 g) × 100% = 54.91%

4 0
3 years ago
The diagram below shows part of the rock cycle.
snow_lady [41]
The answer is igneous
5 0
4 years ago
Read 2 more answers
A medicine is given 73 grains ap/lbs. of patient per dose. The patient weighs 65.7 kilograms. how many drams ap should the apoth
erastova [34]

10,573.4

Explanation:

Given parameters:

Dosage per patient = 73ap/lbs

Weight of patient = 65.7kg

Unknown:

Amount of grams/ap to be given to the patient;

 

Solution:

Since our final answer should be expressed in grams, let us convert all units into grams.

   1000g = 1kg

 Converting 65.7kg to g = 65.7 x 1000 = 65700g

73ap/lbs;

      1lb = 453.6g

 73ap/lbs x \frac{1lb}{453.6g} = 0.161ap/g

Now,

 For a 65700g person, the number of grains app required;

      65700 x 0.161 = 10,573.4grains ap per dose

learn more:

Mass brainly.com/question/3764212

#learnwithBrainly

3 0
3 years ago
The melting point of chromium is 1890. The melting point of argon is -189. Suggest a reason for this difference.
DanielleElmas [232]

Answer:

Different forces between atoms and difference in structure.

4 0
4 years ago
Granite was formed slowly as magma cooled. What is the result of this slow cooling?
Brums [2.3K]

Answer:

The answer is Large Crystals

Explanation:

I took the test just now.

4 0
4 years ago
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