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Fofino [41]
3 years ago
6

What is a chemical change??

Chemistry
1 answer:
alina1380 [7]3 years ago
4 0
<span>Chemical change is any change that results in the formation of new chemical substances. </span>
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The mass of water in a single popcorn kernel was found to be 0.905 grams after it popped at a temperature of 175 °C. Using the i
Rus_ich [418]

Answer:

0.583 kilojoules

Explanation:

The amount of heat required to pop a single kernel can be calculated using the formula as follows:

Q = m × c × ∆T

Where;

Q = amount of heat (J)

m = mass of water (g)

c = specific heat capacity of water (4.184 J/g°C)

∆T = change in temperature

From the given information, m = 0.905 g, initial temperature (room temperature) = 21°C , final temperature = 175°C, Q = ?

Q = m × c × ∆T

Q = 0.905 × 4.184 × (175°C - 21°C)

Q = 3.786 × 154

Q = 583.044 Joules

In kilojoules i.e. we divide by 1000, the amount of heat is:

= 583.04/1000

= 0.583 kilojoules

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3 years ago
HELP ITS DUE IN 10 MIN How long will it take an object to move 100 meters if the object is traveling with an average
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Answer:

Would it be<em><u> 7.69 seconds</u></em>?

Explanation:

5 0
2 years ago
19. What is the density of a 16.39
slavikrds [6]
Density= mass/volume

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Make sure to use the correct number of significant figures (4)
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I need this answer ASAP
asambeis [7]

Answer:

B: Physical Science

Explanation:

The answer is physical science because you need to know the laws of physics and chemistry to know how a car works. Physical sciences = the sciences concerned with the study of inanimate natural objects, including physics, chemistry, astronomy, and related subjects.

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Lab Report
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Answer:

The purpose of the experiment is to see how water of different temperature and salinity affect the density.

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Temperature and salinity directly affect the density of the water. Water of low temperature is more dense than water of high temperature, BUT, (fresh)water with no salt is less dense than (sea)water with more salt, so temperature and salinity change density of water.

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