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Viefleur [7K]
3 years ago
10

What gases are exchanged during respiration?

Chemistry
2 answers:
Usimov [2.4K]3 years ago
7 0

Answer:

Explanation:

there should be more showing than telling

Dvinal [7]3 years ago
7 0

Answer:

oxygen and carbon dioxide.

Explanation:

You might be interested in
Determine the mass of oxygen that is needed to react with 33 grams of phosphorus.
Kipish [7]

Answer:

D = Mass =  42.6 g

Explanation:

Given data:

Mass of phosphorus react = 33 g

Mass of oxygen needed = ?  

Solution:

Chemical equation:

4P + 5O₂     →      2P₂O₅

Number of moles of phosphorus:

Number of moles = mass/molar mass

Number of moles = 33 g/ 30.97 g/mol

Number of moles = 1.065 mol  

now we will compare the moles of phosphorus and oxygen.  

               P         :       O₂  

               4         :        5  

        1.065        :        5/4×1.065 = 1.33mol

Mass of oxygen needed:

Mass = number of moles × molar mass

Mass = 1.33 mol × 32 g/mol  

Mass = 42.6 g

Thus, 43.6 g of oxygen needed to react with 33 g of phosphorus.

8 0
3 years ago
In the reaction MgCl2 + 2KOH Mg(OH)2+ 2KCI, if 3 moles MgCh are added to 4 moles KOH, what determines how much Mg(OH)2 is made?
gulaghasi [49]

Answer:-

KOH determines how much Mg(OH)2 is made.

2 mol of Mg(OH)2 formed

Explanation:-

The balanced equation is

MgCl2 + 2KOH --> Mg(OH)2+ 2KCI,

From seeing the coefficients we notice

2 mol of KOH reacts with 1 mol of MgCl2

4 mol of KOH reacts with 1 x 4 / 2 = 2 mol of MgCl2

3 moles of MgCl2 was added but only 2 mol react.

So we see there is excess MgCl2 .

Hence KOH is the limiting reactant.

So KOH determines how much Mg(OH)2 is made.

We see from the balanced chemical equation,

2 mol of KOH gives 1 mol of Mg(OH)2.

4 mol of KOH will give 1 x 4 /2 = 2 mol of Mg(OH)2.

7 0
3 years ago
Conversion factors are useful in solving problems in which a given measurement must be expressed in
spin [16.1K]

Conversion factors are useful in solving problems in which a given measurement must be expressed in some other units of measure.


Conversion factors
are helpful in solving issues where one unit of measurement needs to be expressed in another. In general, a measurement's numerical value changes when it is multiplied by a conversion factor, while the quantity being measured's real size stays the same.
A conversion factor is a number that is used to multiply or divide one set of units into another. If a conversion is required, it must be done using the correct conversion factor to get an identical value. For instance, 12 inches equals one foot when converting between inches and feet.

To learn more about Conversion factors please visit -brainly.com/question/23510660
#SPJ1

4 0
2 years ago
Identify the state(s) of matter that each property describes.
DIA [1.3K]

Answer:

1) takes the shape of its container ( liquid and gas).

2) fills all available space (gas)

3) maintains its shape ( solid)

4) can be poured ( liquid)

5) is compressible ( gas)

6) has a fixed volume ( liquid and solid)

Explanation:

Matter is simply defined as anything that has weight and occupies space. It exists in three states, namely: solid, liquid and gaseous states.

The properties of different states of matter includes:

SOLID STATE

--> It has a definite shape: The shape of a solid is fixed; it does not depend on the shape of other materials.

--> It has a definite volume: it occupies its own shape due to the force of cohesion among its molecules.

--> It is tightly packed: The molecular movements of particles are negligible.

LIQUID STATE

--> liquid has a defined volume.

--> it has no definite shape: There is no specific shape of a liquid. It occupies any available space. It's shape depends on the shape of the container into which it is poured.

GASEOUS STATE

--> it has no fixed shape: Due to the distance in the molecules of gas, the gaseous state has no shape. It occupies the shape of its container.

--> It has no fixed volume: it occupies the shape of any container that is closed.

--> It is highly compressible: The particles of gas are far off from one another and there is room for collision.

4 0
3 years ago
What are the amounts of molecules in 19 g flourine
olya-2409 [2.1K]

Answer:

molecules present in, 76 gram of fluorine

Explanation:

atomic weight of fluorine is 19 g per mole, molecular weight  is 38g per mole .

Therefore 76 gram fluorine contains 1976=4 gram atom

8 0
3 years ago
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