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Naddik [55]
4 years ago
15

Which term best describes the role of hydrogen gas in the formation of water molecules?

Chemistry
1 answer:
kobusy [5.1K]4 years ago
6 0
The answer is D, reactant.
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If you dilute 40.0 mL of a 7.0 M solution to make 100.0 mL of solution, what is the molarity of the dilute solution?
Burka [1]

Answer:

2.8M

Explanation:

The following data were obtained from the question:

Volume of stock solution (V1) = 40mL

Molarity of the stock solution (M1) = 7M

Volume of diluted solution (V2) = 100mL

Molarity of diluted solution (M2) =?

Using the dilution formula, we can easily find the molarity of the diluted solution as follow:

M1V1 = M2V2

7 x 40 = M2 x 100

Divide both side by 100

M2 = (7 x 40)/100

M2 = 2.8M

Therefore, the molarity of the diluted solution is 2.8M

3 0
3 years ago
What is the answer to the question?​
Charra [1.4K]
The answer to your question is the number 3
8 0
3 years ago
A small portion of a crystal lattice is sketched below. What is the name of the unit cell of this lattice? Your answer must be a
Nikolay [14]

This is an incomplete question, the given sketch is shown below.

Answer : The name of given unit cell is, FCC (face-centered cubic unit cell)

Explanation :

Unit cell : It is defined as the smallest 3-dimensional portion of a complete space lattice which when repeated over the and again in different directions produces the complete space lattice.

There are three types of unit cell.

  • SCC (simple-centered cubic unit cell)
  • BCC (body-centered cubic unit cell)
  • FCC (face-centered cubic unit cell)

In SCC, the atoms are arranged at the corners.

Z=\frac{1}{8}\times 8=1

The number of atoms of unit cell = Z = 1

In BCC, the atoms are arranged at the corners and the body center.

Z=\frac{1}{8}\times 8+1=2

The number of atoms of unit cell = Z = 2

The given unit cell is, FCC because the atoms are arranged at the corners and the center of the 6 faces.

Z=\frac{1}{8}\times 8+\frac{1}{2}\times 6=4

The number of atoms of unit cell = Z = 4

Thus, the name of given unit cell is, FCC (face-centered cubic unit cell)

7 0
4 years ago
Calculate the energy required to move from solid water at 0 degrees C to liquid water at 0 degrees C
Serhud [2]

Answer:

Q = 334\,kJ

Explanation:

Let assume that 1 kilogram of water in solid state at one atmosphere of pressure. The fussion latent heat of 334\,\frac{kJ}{kg}, the heat required to change the phase of water is:

Q = m \cdot L_{f}

Q = (1\,kg)\cdot \left(334\,\frac{kJ}{kg} \right)

Q = 334\,kJ

7 0
4 years ago
What are the products formed when ethane burns in excess oxygen?
Neporo4naja [7]
2 C2H6 + 7 O2 -> 4CO2 + 6 H2O 
<span>so the products are carbondioxide & water vapour</span>
3 0
3 years ago
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