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Grace [21]
3 years ago
12

What is the formula of silicon(IV)oxide?​

Chemistry
1 answer:
Vesnalui [34]3 years ago
6 0

Answer:

SiO2

Explanation:

'Si' is the label given to silicon on the periodic table.

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If we start with 1.000 g of strontium-90, 0.805 g will remain after 9.00 yr. This means that the of strontium-90 is ________ yr.
lesantik [10]

The question is incomplete, here is the complete question.

If we start with 1.000 g of strontium-90, 0.805 g will remain after 9.00 yr. This means that the half-life of strontium-90 is ________ yr.

a. 28.8 b. 30.9 c. 35.4 d. 32.2

Answer :  The half-life of strontium-90 is 28.8 years.

Explanation :

This is a type of radioactive decay and all radioactive decays follow first order kinetics.

First we have to calculate the rate constant.

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

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

where,

k = rate constant

t = time taken for decay process  = 9.00 year

a = initial amount or moles of the reactant  = 1.000 g

a - x = amount or moles left after decay process  = 0.805 g

Putting values in above equation, we get:

k=\frac{2.303}{9.00}\log\frac{1.00}{0.805}

k=0.0241\text{ year}^{-1}

To calculate the half-life, we use the formula :

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

0.0241\text{ year}^{-1}=\frac{0.693}{t_{1/2}}

t_{1/2}=28.8\text{ years}

Therefore, the half-life of strontium-90 is 28.8 years.

5 0
3 years ago
Which of the following are properties of metalloids?
harkovskaia [24]

Answer:

all of these are properties of metalloids

3 0
2 years ago
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Mol of CO2 are produced.<br> When 2.5 mol of O2 are consumed in their reaction,
monitta

Answer:

1.5 moles

Explanation:

4 0
3 years ago
Brainliest is you answer quick!!!
Diano4ka-milaya [45]

Answer:

The inside layer of skin is the Insulator layer.

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8 0
2 years ago
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How does knowing the meaning of prefix-trans help you remember what happens to light that strikes a translucent object ?
katovenus [111]

Explanation:

The prefix trans- and its variant tra- mean "across".

A translucent substance allows some light to go "across" it to the other side. Also, think about a transparent substance: it allows light to go "across" it; or a translation, it is a going "across" from one language into another.

6 0
2 years ago
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