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Korvikt [17]
3 years ago
5

Why do substances in a mixture keep their identities?

Chemistry
1 answer:
zheka24 [161]3 years ago
6 0

Answer:

because no chemical change takes place when a mixture is made

Explanation:

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Using the equation below, calculate the number of grams of H2O that are formed from the reaction of 34.0 g of NH3.
Mumz [18]

Answer:

54 grams of H₂O

Explanation:

4NH₃ + 3O₂   →   2N₂ + 6H₂O

Ratio is 4:6.

Let's convert the mass of ammonia in moles

Mass / Molar mass = Mol

34 g / 17 g/m = 2 moles

If 4 moles of ammonia are needed to produce 6 mol of water

2 mol of NH₃ will produce ( 2 .6 )/4 = 3 moles

Molar mass water = 18 g/m

Mass = mol . molar mass → 3 m . 18 g/m = 54 grams

8 0
3 years ago
Suppose you are given an unknown solid material. Describe some tests you might perform to prove that is either an element or a c
nikitadnepr [17]
<span>An element is a pure substance that cannot be broken down by further chemical techniques. Therefore you could try heating, cooling, electrolysis or other methods to see if it was an element or a compound.</span>
5 0
3 years ago
In a room full of air, the air is mainly composed of Nitrogen and Oxygen molecules (both at room temperature). Find (to two sign
zloy xaker [14]

Explanation:

Expression for the v_{rms} speed is as follows.

            v_{rms} = \sqrt{\frac{3kT}{M}}

where,   v_{rms} = root mean square speed

                     k = Boltzmann constant

                    T = temperature

                    M = molecular mass

As the molecular weight of oxygen is 0.031 kg/mol and R = 8.314 J/mol K. Hence, we will calculate the value of v_{rms} as follows.

               v_{rms} = \sqrt{\frac{3kT}{M}}

                            = \sqrt{\frac{3 \times 8.314 J/mol K \times 309.02 K}{0.031 kg/mol}}

                            = 498.5 m/s

Hence, v_{rms} for oxygen atom is 498.5 m/s.

For nitrogen atom, the molecular weight is 0.028 kg/mol. Hence, we will calculate its v_{rms} speed as follows.

                v_{rms} = \sqrt{\frac{3kT}{M}}

                              = \sqrt{\frac{3 \times 8.314 J/mol K \times 309.92 K}{0.028 kg/mol}}

                              = 524.5 m/s

Therefore, v_{rms} speed for nitrogen is 524.5 m/s.

3 0
3 years ago
A scientist has 8.5 g of silver nitrate and needs to prepare 1.5 L of a 0.020 M solution. Will there be enough silver nitrate? I
andrey2020 [161]

Answer:

is

Explanation:

the fest president is

4 0
3 years ago
What makes water so good at dissolving other things
Nina [5.8K]

Water molecules are polar. Water has the ability to dissolve a variety of different substances. Water dissolves more substances than any other liquid. Water has excellent chemical composition and physical attributes. This is why water is such a great solvent.

Hope this helps!

5 0
3 years ago
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