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irinina [24]
2 years ago
7

(20 Points!!!!!)

Chemistry
2 answers:
Nezavi [6.7K]2 years ago
4 0
A) Chemical Change .........
trasher [3.6K]2 years ago
3 0

i am pretty sure it would be a chemical change so A

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An archaeologist graduate student found a leg bone of a large animal during the building of a new science building. The bone had
Vlad [161]

Answer : The time passed in years is 2.74\times 10^2\text{ years}

Explanation :

Half-life of carbon-14 = 5730 years

First we have to calculate the rate constant, we use the formula :

k=\frac{0.693}{t_{1/2}}

k=\frac{0.693}{5730\text{ years}}

k=1.21\times 10^{-4}\text{ years}^{-1}

Now we have to calculate the time passed.

Expression for rate law for first order kinetics is given by:

t=\frac{2.303}{k}\log\frac{a}{a-x}

where,

k = rate constant  = 1.21\times 10^{-4}\text{ years}^{-1}

t = time passed by the sample  = ?

a = initial amount of the reactant disintegrate = 15.3

a - x = amount left after decay process = 14.8

Now put all the given values in above equation, we get

t=\frac{2.303}{1.21\times 10^{-4}}\log\frac{15.3}{14.8}

t=274.64\text{ years}=2.74\times 10^2\text{ years}

Therefore, the time passed in years is 2.74\times 10^2\text{ years}

4 0
3 years ago
Consider the unbalanced chemical equation HBr + B = BBr3 + H2. When
Vitek1552 [10]

Answer:

B and BBr3

Explanation:

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2) 6HBr + <em>2B </em>= <em>2BBr3</em> + 3H2

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Mademuasel [1]
Its FeSO3 or iron(iii)sulfite = Fe2(SO3)3
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10

s=8

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2 years ago
How many moles are in 68.5 liters of oxygen gas at STP?
g100num [7]
We can solve this problem when we use the conditions of a gas at standard temperature and pressure. It has been established that at STP where the temperature is 0 degrees Celsius and the pressure is 101.325 kPa, the volume of 1 mole of gas is 22.4 L. We will use this data for the calculations.

68.5 L ( 1 mol O2 / 22.4 L O2 ) = 3.06 mol O2
7 0
2 years ago
Read 2 more answers
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