3 years ago

Is my answer correct?

Chemistry

1 answer:

natta225 [31]3 years ago

3 0

Yes the ANSWER is Correct-

On first half life the mass will be 10 gram

On second half life the mass will be 5 gram

On third half life the mass will be 2.5 gram

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B) Name three substances which can undergo sublimation and deposition respectively

SpyIntel [72]

solid carbon dioxide, iodine, arsenic, and naphthalene

Explanation:

Examples of substances that undergo sublimation

Examples of solids that sublime are dry ice (solid carbon dioxide), iodine, arsenic, and naphthalene (the stuff mothballs are made of).

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3 years ago

Earth is approximately 1.5x10^8 km from the sun. The speed of light is 3.0x10^8. How many minutes does it take for light to reac

Masteriza [31]

1.5 x 10 $^{8}$ mm = 1500 x 10 $^{8}$ m

1500 x 10 $^{8}$ / ( 3.0 x 10 $^{8}$ ) = 500 s

500/60 = 8.3

So approximately it takes 8.5 minutes

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How many moles of hydrogen are in 5.2 moles of c7h18

alexandr1967 [171]

The percentage of hydrogen in C7H18 is calculated as follows:
[18/(12*7+1*8)]*100=18%
The amount of hydrogen in 5.2moles is given by:(18/100)*5.2=0.94moles

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lina2011 [118]

The Cambrian period I think

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Light travels at a speed of 3.00 × 1010 cm/sec. What is the speed of light in kilometers/hour?

snow_lady [41]

Answer:

300,000km is the speed of light

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