What can be found in the Asteroid Belt?

The age of fossils can sometimes be determined by radiometric dating, which is based on the constant rate of decay of radioactiv

True [87]

The age of the fossil given the present amount of Carbon-14 is given in the equation,
A(t) = A(o)(0.5)^t/h
where A(t) is the current amount, A(o) is the initial amount, t is time and h is the half-life. Substituting the known values to the equation,
A(t) / A(o) = 0.125 = (0.5)^(t/5730)
The value of t from the equation is 17190.
Thus, the age of the fossil is mostly likely to be 17190 years old.

8 0

3 years ago

How many grams of oxygen are required to react with 12.0 grams of octane(C8H18) in the combustion of octane in gasoline?

solniwko [45]

Answer : 42 grams of oxygen are required.

Explanation :

Step 1 : Write balanced chemical equation.

The combustion reaction of octane with oxygen can be written as,

$2 C_{8}H{18} (g) + 25 O_{2} (g) \rightarrow 16 CO_{2} (g) +18 H_{2}O (g)$

Step 2 : Find moles of octane.

The given mass of octane is 12 g

Molar mass of octane is 114.2 g/mol

The moles of octane are calculated as,

$moles =\frac{grams}{MolarMass} =\frac{12g}{114.2g/mol} = 0.105 mol$

We have 0.105 mol octane.

Step 3: Use mole ratio from balanced equation to find moles of O₂

The mole ratio of octane and O₂ is 2 : 25. Let us use this as a conversion factor.

$0.105 mol C_{8}H_{18} \times\frac{25mol O_{2}}{2molC_{8}H_{18}} = 1.31 mol$

We have 1.31 mol O₂.

Step 4 : Convert moles of O₂ to grams.

The molar mass of O₂ is 32 g/mol.

The grams of O₂ can be calculated as,

$1.31 mol O_{2} \times\frac{32g}{mol} = 42 grams$

42 grams of oxygen are required.

8 0

3 years ago

The Moon is always half lit and half dark.

Natasha_Volkova [10]

Answer:

True

Explanation:

Just like the Earth, half of the Moon is lit by the Sun while the other half is in darkness.

4 0

3 years ago

Read 2 more answers

An essential utensil for various tasks from cleaning vegatables to training pasta ir tin contents

zavuch27 [327]

Correct question: A tool used for vegetable strainer,it is essential for various tasks from cleaning vegetables to straining pasta or tin contents.

Answer: The tool is called COLANDER.

Explanation:

In the kitchen, there are different types of equipments and utensils which makes work easier and faster. Examples of such equipment/ utensils includes:

--> graters,

--> cutleries ( spoon, fork, knife)

--> colanders

--> Pots

--> Blenders

These utensils are made up of rubber, plastics, wood, ceramics and stainless steel.

A Colander is an important kitchen utensil, a type of strainer with perforated holes. The holes allows fluid to drain leaving behind the solid part. It is usually bowl - shaped. It helps in performing the following roles in the kitchen:

--> cleaning vegetables

--> straining of pasta

--> straining of tin contents

Colanders are usually made of stainless steel, plastics and ceramics.

4 0

3 years ago

14. As the temperature of a gas in a closed container increasses, what is true of the particles in the substance? (2 points)

Ede4ka [16]

The rate of particle movement increases, also increases the pressure in the vessel

4 0

3 years ago