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3 years ago

Which of the following do you think use plasma?

Chemistry

2 answers:

KATRIN_1 [288]3 years ago

5 0

Answer:

Rocket engines

Explanation:

U know how I know it? Well I'm an astrophysicist and of course I watch star wars...

Colt1911 [192]3 years ago

5 0

Answer Rocket engines

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Carbon-14 has a half-life of 5720 years and this is a first order reaction. If a piece of wood has converted 75% of the carbon-1

liraira [26]

Answer: 1145.8 years

Explanation:

Half-life of carbon-14 = 5720 years

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

$k=\frac{0.693}{5720\text{years}}$

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

Now we have to calculate the age of the sample:

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 = age of sample = ?

a = let initial amount of the reactant = 100 g

x = amount decayed = 75 g

a - x = amount left after decay process = 100 - 75 = 25g

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

$t==\frac{2.303}{1.21\times 10^{-4}}\log\frac{100}{25}$

$t=1145.8years$

8 0

3 years ago

Read 2 more answers

Is cleaning bleach a pure substance or mixture

Ray Of Light [21]

Cleaning bleach is a mixture of chemicals. pure bleach is called hypochlorite<span> and is a pure substance.

hope i helped :)</span>

4 0

3 years ago

How many moles of Ammonium Sulfate can be made from 30.0mol of NH3? 2NH3 + H2SO4 --> (NH4)2SO4

BartSMP [9]

Answer: 15.0 moles of $(NH_4)_2SO_4$ are formed from 30.0 mol of $NH_3$

Explanation:

The balanced chemical reaction is :

$2NH_3+H_2SO_4\rightarrow (NH_4)_2SO_4$

According to stoichiometry :

2 moles of $NH_3$ give = 1 mole of $(NH_4)_2SO_4$

Thus 30.0 moles of $NH_3$ will give = $\frac{1}{2}\times 30.0=15.0moles$ of $(NH_4)_2SO_4$

Thus 15.0 moles of $(NH_4)_2SO_4$ are formed from 30.0 mol of $NH_3$

7 0

4 years ago

So2−3(aq)→so2−4(aq) (basic solution) express your answer as a chemical equation. identify all of the phases in your answer. so32

alexira [117]

Answer:

$SO_{3}^{2-}(aq.)+2OH^{-}(aq.)\rightarrow SO_{4}^{2-}(aq.)+H_{2}O(l)+2e^{-}$

Explanation:

The given reaction is an example of oxidation reaction. The step-by-step balancing procedure has been shown below:

Chemical equation: $SO_{3}^{2-}(aq.)\rightarrow SO_{4}^{2-}(aq.)$

Balance H and O in basic medium: $SO_{3}^{2-}(aq.)+2OH^{-}(aq.)\rightarrow SO_{4}^{2-}(aq.)+H_{2}O(l)$

Balance charge: $SO_{3}^{2-}(aq.)+2OH^{-}(aq.)\rightarrow SO_{4}^{2-}(aq.)+H_{2}O(l)+2e^{-}$

Balanced chemical equation:

$SO_{3}^{2-}(aq.)+2OH^{-}(aq.)\rightarrow SO_{4}^{2-}(aq.)+H_{2}O(l)+2e^{-}$

6 0

4 years ago

How are the elements in the current periodic table arranged

natka813 [3]

Answer:

Elements in the periodic table are arranged from atomic number, increasing as you move more towards the right direction.

6 0

3 years ago

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