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True [87]
3 years ago
5

You are writing a report on whether global warming really exists. Which of the following resources would be the most scientifica

lly reliable? (2 points) an article containing documented experiments and data a newspaper article quoting leaders of several countries a website with articles posted by people around the world an article containing a poll taken of students at leading universities
Chemistry
1 answer:
Ierofanga [76]3 years ago
5 0

For this question, I would definitely say an article containing documented experiments and data because if you are talking about something to do with science, you should use science to prove your point. People usually believe articles done by someone who did the experiment themselves rather than quoting other people from their findings.

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Which of the following are indicators of a chemical change?
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Answer:

All unexpected changes: color change (two clear liquids make purple), temperature change, Odor change or formation, precipitate formation (solid forms), and the production of gas.

Explanation:

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When elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that
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Water has a heat of fusion of about 300J/gram and a heat capacity for liquid water of a about 4J/gC. How much heat is needed to
amm1812

Answer:

The total heat required is 3.4 kJ

Explanation:

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

There is a direct proportional relationship between heat and temperature. So, the amount of heat a body receives or transmits is determined by:

Q = c * m * ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case you know;

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Q= 4\frac{J}{g*C} *10 g * 10 C

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On the other hand, you must determine the heat required to convert 0 ∘ C of ice to 0 ∘ C of liquid water by:

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<u><em>The total heat required is 3.4 kJ</em></u>

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L
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mol/dm³ is measure for molarity
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