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qaws [65]
2 years ago
11

Mixture Problem A jeweler has five rings, each weigh- ing 18 g, made of an alloy of 10% silver and 90% gold. She decides to melt

down the rings and add enough silver to reduce the gold content to 75%. How much silver should she add?
Chemistry
1 answer:
Tpy6a [65]2 years ago
8 0

Answer:

Explanation:

Total weight of 5 rings

= 18 x 5

= 90 g

silver = 10% of 90 g

= 9 g

gold = 81 g

Let silver added = x gm

Total weight = 90 +x

75% of (90+x) is gold

= 3/4 x  (90+x)g is  gold

So  3/4 x  (90+x)  = 81

(90+x)  = 81 x 4 / 3

= 108

x = 18 g

silver to be added = 18g .  

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Which of the following statements regarding glucose is FALSE?a) Glucose is the main component of starch and glycogen.b) Glucose
marishachu [46]

Answer:

The correct option is C.

Explanation:

Carbohydrates are one of the macro molecules that are consumed by living organisms. The end product of carbohydrate is glucose. Glucose is a very important fuel that the body cells used to produce energy, which they use to carry out their daily activities. Glucose is also known as blood sugar and it is the only fuel that living cells can use for the production of ATP. Other food macro molecules such as lipids and proteins can also be converted to glucose if there is a need for that. Glucose is always stored in the body in form of glycogen.

The statement given in option C about glucose is wrong because glucose is a monosaccharide and not a disaccharide.

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Explanation:

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valentina_108 [34]
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How many microliters are in 7.4 x 10^-61 centimeters?
schepotkina [342]

Answer:

Microliters = 7.4\times 10^{-58}

Explanation:

SI unit of volume is liter.

1 dm^{3}=1 liter ..............................(1)

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1dm^{3} = 1000 cm^{3}.................(2)

replacing value of 1 dm^{3}from equation (1) in equation (2)

1 liter = 1000 cm^{3}...................(3)

but

1 liter = 10^{6} microliters....................(4)

replacing value of 1 liter from equation (3) in equation (4)

1000 cm^{3} = 10^{6} microliters

on solving further ,we get

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7.4\times 10^{-61}\times 1000

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