Given the equation representing a reaction:

lesantik [10]

Answer:

A

Explanation:

The octet rule refers to the tendency of atoms to prefer to have eight electrons in the valence shell. When atoms have fewer than eight electrons, they tend to react and form more stable compounds. When discussing the octet rule, we do not consider d or f electrons. Only the s and p electrons are involved in the octet rule, making it useful for the main group elements (elements not in the transition metal or inner-transition metal blocks); an octet in these atoms corresponds to an electron configurations ending with s2p6 .

5 0

3 years ago

Read 2 more answers

A scientist is investigating the properties of two different biological membranes that have different amounts of cholesterol in

REY [17]

Answer:

The cholesterol has 2 main properties in cell membranes

Explanation:

The first one is that promotes the hydrophobicity, that is, the cell membranes turn more impermeable, so it will not allow to enter liquids, like the water.

The other function of cholesterol is that with a high quantity of cholesterol in it, it makes that the cell membrane is not so fluid, reduces the flexibility of the oils in membranes, this is because the cholesterol is a bigger molecule in contrast with fatty acid.

5 0

4 years ago

how many ml of 0.032 molar kmno4 are required to react with 50.0 ml of 0.100 molar h2c2o4 in the presence of excess h2so4

BartSMP [9]

Answer:

62.5 ml of 0.032 M KMnO₄ are required to react with 50.0 ml of 0.100 molar H₂C₂O₄ in the presence of excess H₂SO₄

Explanation:

The balanced reaction is:

2 KMnO₄ + 5 H₂C₂O₄ + 3 H₂SO₄ → K₂SO₄ + 2 MnSO₄ + 8 H₂O + 10 CO₂

By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

KMnO₄: 2 moles
H₂C₂O₄: 5 moles
H₂SO₄: 3 moles
K₂SO₄: 1 mole
MnSO₄: 2 moles
H₂O: 8 moles
CO₂: 10 moles

Molarity or Molar Concentration is the number of moles of solute that are dissolved in a certain volume.

The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution:

$Molarity=\frac{number of moles of solute}{volume}$

Molarity is expressed in units $\frac{moles}{liter}$

In this case, 50 mL (0.05 L) of 0.1 M H₂C₂O₄ react. So, replacing the data in the definition of molarity:

$0.1 M=\frac{number of moles of solute}{0.05 L}$

Solving:

number of moles of solute= 0.1 M*0.05 L

number of moles of solute= 0.005 moles

So, 0.005 moles of H₂C₂O₄ react. Then you can apply the following rule of three: if by stoichiometry 5 moles of H₂C₂O₄ react with 2 moles of KMnO₄, 0.005 moles of H₂C₂O₄ react with how many moles of KMnO₄?

$moles of KMnO_{4} =\frac{0.005moles of H_{2} C_{2} O_{4}* 2moles of KMnO_{4} }{5moles of H_{2} C_{2} O_{4} }$

moles of KMnO₄= 0.002 moles

Knowing that the molarity of KMnO₄ is 0.032 M, replacing in its definition and solving:

$0.032 M=\frac{0.002 moles}{volume}$

$volume=\frac{0.002 moles}{0.032 M}$

volume= 0.0625 L= 62.5 mL

<u><em>62.5 ml of 0.032 M KMnO₄ are required to react with 50.0 ml of 0.100 molar H₂C₂O₄ in the presence of excess H₂SO₄</em></u>

6 0

3 years ago

For the reaction shown, 38.25 grams of silicon is combined with 14.33 grams of nitrogen gas. How many grams of silicon nitride c

mr_godi [17]

From the periodic table:
molar mass of silicon = 28 grams
molar mass of nitrogen = 14 grams

From the balanced chemical equation,
3 x 28 = 84 grams of silicon react with 2 x 2 x 14 = 56 grams of nitrogen to produce 3(28) + 4(14) = 140 grams of silicon nitride.

Since it is mentioned that nitrogen is the limiting reagent, therefore, the reaction will stop once the amount of reacting nitrogen is consumed.
Now we know that 56 grams of nitrogen produce 140 grams of silicon nitride. Thus, we can use cross multiplication to calculate the amount of silicon nitride produced when using 14.33 grams of nitrogen as follows:

amount of produced silicon nitride = (14.33 x 140) / 56 = 35.8 grams

6 0

4 years ago

Questions int he photo, any absurd answers will be reported and person will get branliest if its correct.

postnew [5]

Answer:

1.Neutrons

2.Protons

Explanation:

If not correct im very sorry

5 0

3 years ago