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Ivahew [28]
3 years ago
14

Please help will reward brainliest

Chemistry
1 answer:
dimaraw [331]3 years ago
7 0
The answer is most definitely “A”
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How many significant figures does the number have?<br> 9,000,100
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5 Significant Figures

Explanation:

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The combination of all frequencies of visible light makes
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Answer:The visible light contains 7 colours  :  Violet, indigo, Blue, Green, Yellow, Orange and Red.

White colour is formed by the interference of all 7 colours, thus white light has the combination of all frequencies of visible light.

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the amount of heat involved in the synthesis of 1 mole of a compound from its elements with all substances in their standard sta
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<span>The </span>standard enthalpy of formation<span> <span>is defined as the change in </span></span>enthalpy<span> <span>when one mole of a substance in the </span></span>standard<span> <span>state (1 atm of pressure and temperature of 298.15 K) is </span></span>formed<span> <span>from its pure elements under the same conditions.</span></span>

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3 years ago
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Calculate sound speed in hydrogen H2 at temperture 50 C degree. Answer give in meter per second.
irina [24]

Answer:

The speed of sound in hydrogen gas is 361.5 ^{\circ} C

Explanation:

It is given that the temperature is 50 ^{\circ} C.

The speed of sound in meter per second is calculated by an equation.

The equation states that speed of the sound in meter per second is equal to the sum of the product of the temperature in degree celsius with 0.60 and a constant that is 331.5.

The equation is written as:

speed \ of \ sound \left(m/s \right) = 0.60 \times T + 331.5

Put the value of T = 50 then the equation becomes,

speed \ of \ sound \left(m/s \right) = 0.60 \times 50 + 331.5

Speed of sound (in m/s) = 361.5 m/s

4 0
3 years ago
A 2,000g of C-14 is left to decay radioactively. The half-life of Carbon-14 is approximately 5,700 years. What percentage of the
dsp73
Answer is: 12,6% (1/8) <span>percentage of the sample will remain.
</span>c₀ - initial amount of C-14.<span>
c - amount of C-14 remaining at time.
t = 5700</span> y.<span>
First calculate the radioactive decay rate constant λ:
λ = 0,693 ÷ t = 0,693 ÷ 5700</span> y = 0,000121 1/y = 1,21·10⁻⁴ y.
c = c₀·e∧-λ·t.
c = 2000 · e∧-(0,000121 1/y · 17100 y).
c = 252 g.
ω = 252 g ÷ 2000 g = 0,126 = 12,6%.
<span>

</span>
4 0
3 years ago
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