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3 years ago

Uses of carbon dioxide.

Chemistry

1 answer:

andrey2020 [161]3 years ago

6 0

Answer:

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Explanation:

used in fire extinction, blasting rubber, foaming rubber and plastic

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In the reaction of aluminum and iron(iii) oxide to form iron and aluminum oxide, δh is - 850 kj. how many grams of aluminum oxid

Semmy [17]

The grams of aluminium oxide are formed when 350 kj heat are released is calculated as follows

1mole = 850Kj
what about 350kj
=1mole x350/850 = 0.412 moles

mass of Al = moles of Al x molar mass of Al

= 0.412mol x 27 g/mol = 11.124 grams

8 0

3 years ago

The half-life of silicon-32 is 710 years. If 40 grams is present now, how much will be present in 800 years

Licemer1 [7]

18 g of silicon-32 will be present in 800 years.

A radioactive half-life refers to the amount of time it takes for half of the original isotope to decay and it's given by

$N(t) = N_0 (\frac{1}{2}) ^\frac{t}{t_\frac{1}{2} }$

where,

$N(t) =$ quantity of the substance remaining

$N_0 =$ the initial quantity of the substance

$t =$ time elapsed

$t_1_/_2 =$ the half-life of the substance

From the given information we know:

The initial quantity of silicon-32 is 40 g.

The time elapsed is 800 years.

The half-life of silicone-32 is 710 years.

So, using the calculation above, we can determine how much silicon-32 is left.

$N(t) = 40 (\frac{1}{2}) ^\frac{800}{710} \\N(t) = 40 (\frac{1}{2}) ^\frac{80}{71} \\\\N(t) = 18 g$

Therefore,18 g of silicon-32 will be present in 800 years.

Learn more about half-life here:

brainly.com/question/25750315

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5 0

2 years ago

Two students noted that the acceleration of a car was =40 k/m squared . the fiesta student , "that can't be right . you can't ha

Tju [1.3M]

Answer:

First one: Yes, It can be negative.

Explanation:

First one: The reason you can have negative acceleration is that acceleration can slow down, or decelerate, causing the negative acceleration.

8 0

3 years ago

What type of reaction is occurring when an acid and a base are mixed together?

Law Incorporation [45]

Answer:

It is a neutralization reaction

Explanation:

When an acid and a base are mixed together the reaction occurring is called a Neutralization. It receives that name because the protons ( $H^+$ ) of the acid react with the hydroxil ( $OH^-$ ) of the base, canceling their acid and basic power, respectively.