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2 years ago

What is sinking cold air and rising warm air?

1 answer:

4 0

Since hot air is less dense than cold air, the hot air rises and the cold air sinks. Extra: Warm air topically brings rain cuz it forms over oceans and that’s why hurricanes form over sea and eventually move toward land

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Hannah made a diagram to show how plants make their own food. What should Hannah write to fill in the blank in the diagram?

Black_prince [1.1K]

Answer:

Answer: Energy from the sun.

Explanation:

<em>If you look at the hints it says that it needs something else for a plant to grow and what does a plant need? </em>

<em />

<em>Air, Water, and energy from the Sun to make food</em>

<em />

<em>Hope this helps :)</em>

7 0

3 years ago

Read 2 more answers

6.0 mol Al reacts with 4.0 mol O2 to form Al2O3.

Tema [17]

Answer:

3.0 moles Al₂O₃

Explanation:

We do not know which of the reactants is the limiting reactant. Therefore, you need to convert both of the given mole values into the product. This can be done using the mole-to-mole ratio made up of the balanced equation coefficients.

4 Al + 3 O₂ -----> 2 Al₂O₃

6.0 moles Al 2 moles Al₂O₃
---------------------- x ------------------------- = 3.0 moles Al₂O₃
4 moles Al

4.0 moles O₂ 2 moles Al₂O₃
---------------------- x ------------------------- = 2.7 moles Al₂O₃
3 moles O₂

As you can see, O₂ produces the smaller amount of product. This means O₂ is the limiting reactant. Remember, the limiting reactant is the reactant which runs out before the other reactant(s) are completely reacted. As such, the actual amount of Al₂O₃ produced is 2.7 moles.

However, since this problem is directly addressing how much Al₂O₃ is produced from Al, the answer you most likely are looking for is 3.0 moles Al₂O₃.

6 0

1 year ago

A compound has the formula X2O3 where x is an unknown element. If the compound is 24.26% oxygen, what element does x represent?

Vinil7 [7]

<h3>Answer:</h3>

Element X is Arsenic (Ar)

<h3>Explanation:</h3>

We are given the compound X₂O₃

The compound is 24.26% Oxygen

We are required to identify element X

<h3>Step 1: Determine the mass of Oxygen in the compound </h3>

Atomic mass of Oxygen is 16.0 g

There are three oxygen atoms in the compound

Therefore;

Mass of oxygen in the compound = 3 × 16

= 48 g

<h3>Step 2: Total mass of the compound </h3>

Total percentage = 100%

But, Oxygen in the compound is 24.26 % and has a mass of 48 g

Therefore;

Mass of the compound = (48 g ÷ 24.26 ) × 100

= 197.857 g

<h3>Step 3 mass of X in the compound </h3>

Since we know the mass of oxygen in the compound and the mass of the compound we can determine the mass of X

Mass of X in the compound = Mass of the compound - Mass of Oxygen in the compound

= 197.857 g - 48 g

= 149.857 g

But there are two atoms of X in the compound.

Therefore, molar mass of X = 149.857 g ÷ 2

= 74.929 g

<h3>Step 4: Identity of element X</h3>

We then we need to identify the element with a molar mass of 74.929 g

Therefore, the element represented above is Arsenic which has an atomic mass of 74.92.

Thus, our compound is Ar₂O₃

5 0

2 years ago

A cup has a mixture of iron filings, sand, and salt. How could you separate theses 3 materials? Write out the procedures you wou

Anarel [89]

Explanation:

A cup of mixtures of iron fillings, sand and salt is a mixture who constituents are in the same phase i.e solid.

To separate them out we use the physical properties of the substances.

First spread out the mixture uniformly over a piece of paper or on the table.
Pass a bar magnet over it.
The iron fillings will become attracted to the magnet and separate from the mixture.
then pour water into the mixture of sand and salt
the salt will dissolve since sand is made up of quartz which are highly insoluble.
separate the water solution. Evaporate to dryness and recover the salt.
the sand is left behind and dried.

learn more:

Mixtures brainly.com/question/1832352

#learnwithBrainly

3 0

2 years ago

Is this statement true or false?<br><br> Global warming is likely the result of human activity

Valentin [98]

Answer:Explanation:

This is True.

6 0

3 years ago