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Mariana [72]
3 years ago
5

2. Combine lead (II) nitrate and potassium iodide solutions.

Chemistry
1 answer:
olga_2 [115]3 years ago
6 0

Answer:

Pb(NO3)2+ 2Kl →PbI2 + 2KNO3

Mg + 2HCl → MgCl2 + H2

4H2O → 4H^+ + 4OH^-

2Mg + O2 → 2MgO

Explanation:

This question has to do with the balancing of chemical reaction equations. The general rule for balancing chemical reaction equation is that the number of atoms of each element on the left hand side of the reaction equation must be equal to the number of atoms of the same element on the right hand side of the reaction equation.

This principle was followed in balancing each reaction equation above. For instance, in the burning of magnesium, there are two atoms of both magnesium and oxygen on either side of the reaction equation.

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A sample of the mineral hematite Iron (III) oxide has a mass of 12.4g. How many moles of the mineral are present?
8090 [49]

Thus problem is providing us with the mass of iron (III) oxide as 12.4 g so the moles are required and found to be 0.0776 mol after the calculations:

<h3>Mole-mass relationships:</h3>

In chemistry, we use mole-mass relationships in order to calculate grams from moles and vice versa. In this case, since we are given the mass of iron (III) oxide as 12.4 g one can calculate the moles by firstly quantifying its molar mass:

Fe_2O_3\rightarrow 2*55.85 g/mol+3*16.00 g/mol=159.7g/mol

Then, we prepare a conversion factor in order to cancel out the grams and thus, get moles:

12.4gFe_2O_3*\frac{1molFe_2O_3}{159.7gFe_2O_3} \\\\=0.0776molFe_2O_3

Learn more about mole-mass relationships: brainly.com/question/18311376

8 0
2 years ago
Write down the structural formula for the monomer from which
Sati [7]

Answer:

Vinyl chloride is an organochloride with the formula H2C=CHCl that is also called vinyl chloride monomer (VCM) or chloroethene. This colorless compound is an important industrial chemical chiefly used to produce the polymer polyvinyl chloride (PVC).

Explanation:

7 0
2 years ago
Read 2 more answers
Solid sodium reacts violently with water, producing heat, hydrogen gas, and sodium hydroxide. How many molecules of hydrogen gas
Zinaida [17]

Answer: Number of molecules of hydrogen gas 6.32\times 10^{32}

Explanation:

2Na+2H_2O\rightarrow 2NaOH+H_2

Number of moles of sodium =\frac{\text{mass of sodium}}{\text{molar mass of sodium}}=\frac{48.7 g}{23 g/mol}=2.11mol

According to reaction , 2 moles of sodium produces 1 mole of hydrogen gas , then 2.11 mol of sodium will= \frac{1}{2}\times 2.11 mol of hydrogen gas that is 1.05 moles of hydrogen gas.

Number of molecules = N_A(\text{Avogadro number})\times moles of substance

Moles of hydrogen gas formed = 1.05 moles

Number of molecules of hydrogen gas = N_A\times moles of hydrogen gas

Number of molecules of hydrogen gas =6.022\times 10^{23} mole^{-1}\times 1.05 mole=6.32\times 10^{32}

8 0
3 years ago
How might a hurricane in Florida cause anomalous nest data
cluponka [151]
Assuming that the nests are bird's nests and the data is a data gathered by the biologists about those nests. 
A hurricane would cause some damage to the nests that is existent and cause a remarkably low count even during breeding season. It would also influence later birds because of population weakening due to the hurricane.
6 0
3 years ago
What are all the different types of chemical change?
creativ13 [48]

Answer:

the types of chemical reaction are combination, decomposition, single replacement, double replacement, combustion

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