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Rina8888 [55]
3 years ago
6

4. Explain what you’ve learned about significant figures. How many significant figures are in the measurement 0.03050 kg?

Chemistry
1 answer:
nasty-shy [4]3 years ago
3 0

There are 4 significant figures! Start counting after the first non-zero digit :)

Hope this helps.

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When 3.0 kg of water is warmed from 10 °C to 80 °C, how much heat energy is needed?
Naddik [55]

Answer:

THE HEAT NEEDED TO CHANGE 3KG OF WATER FROM 10 C TO 80 C IS 877.8kJ OR 877,800 J.

Explanation:

Mass = 3.0 kg = 3 * 1000 = 3000 g

Initial temperature = 10 C

Final temperature = 80 C

Change in temperature = 80 - 10 = 70 C

Specific heat of water = 4.18 J/g C

Heat needed = unknown

Heat is the amount of energy in joules needed to change a gram of water by 1 C.

Heat = mass * specific heat * change in temperature

Heat = 3000 g * 4.18 J/g C * 70 C

Heat = 877 800 Joules

Heat = 877.8 kJ.

The heat needed to change 3 kg mass of water from 10 C to 80 C is 877,800 J or 877.8 kJ.

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Answer:

Explanation:

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Excessive use of fertilizers make soil fertile. true or false​
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5 0
2 years ago
How conditions on Earth would be different if its axis of rotation were vertical instead of tilted.
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For the gas phase decomposition of nitrosyl chloride at 400 K , the rate of the reaction is determined by measuring the appearan
UkoKoshka [18]

Answer:

2.067 x 10⁻⁷ M/min.

Explanation:

  • Knowing that the rate of the reaction is the change in the concentration of reactants (decrease) or the products (increase) with time.

  • For the reaction: <em>2NOCl ⇄ 2NO + Cl₂,</em>

<em>Rate of the reaction = - 1/2 d[NOCl]/dt = 1/2 d[NO]/dt = d[Cl₂]/dt</em>

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3 years ago
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