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3 years ago

Which of the following is not an example of a chemical reaction? Rust Heat from Fire Photosynthesis Melting Ice

Chemistry

2 answers:

VARVARA [1.3K]3 years ago

8 0

Melting ice. Hopefully this helps!

stich3 [128]3 years ago

7 0

Answer: Ice melting

ICE MELTING,... because Ice melts slowly so which is not a chemical reaction... You are trying to find which is not a chemical reaction which would be Ice melting because,... heat and fire have a combination with each other!!

Explanation:

Rust also has a chemical reaction because if you leave something outside yes it is going to rust that is a chemical reaction..

Also photosynthesis is plants decaying or sprouting that is also photosynthesis

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Is silicon a compound yes or no

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Answer: Yes

Explanation: Silicon is never found as a free element naturally, meaning it always occurs with other elements.

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3 years ago

2.What two factors must be held constant for density to be a constant ratio?

irina1246 [14]

Answer:

Temperature and Pressure

Explanation:

Temperature and pressure cause change in volume.

So any change in volume will alter the ratio of density as given by equation of density.

Density = mass/ volume

Change in volume will alter the ratio.

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2 years ago

Read 2 more answers

If nitrogen-13 has a half life of 2.5 years, how much remains from a 100g sample after 7.5 years

Sonbull [250]

Answer:

12.50g

Explanation:

T½ = 2.5years

No = 100g

N = ?

Time (T) = 7.5 years

To solve this question, we'll have to find the disintegration constant λ first

T½ = In2 / λ

T½ = 0.693 / λ

λ = 0.693 / 2.5

λ = 0.2772

In(N/No) = -λt

N = No* e^-λt

N = 100 * e^-(0.2772*7.5)

N = 100*e^-2.079

N = 100 * 0.125

N = 12.50g

The sample remaining after 7.5 years is 12.50g

5 0

3 years ago

A sample of metal has a mass of 18.20g, and a volume of 7.38mL. What is the density in g/cm^3?

AlexFokin [52]

Density = Mass ÷ Volume. You get 2.466

8 0

3 years ago

Problem PageQuestion Methane gas and chlorine gas react to form hydrogen chloride gas and carbon tetrachloride gas. What volume

IgorC [24]

Methane gas and chlorine gas react to form hydrogen chloride gas and carbon tetrachloride gas. What volume of hydrogen chloride would be produced by this reaction if 3.16 L of chlorine were consumed at STP.

Be sure your answer has the correct number of significant digits.

Answer: Thus volume of carbon tetrachloride that would be produced is 0.788 L

Explanation:

According to ideal gas equation:

$PV=nRT$