CHEMISTRY HIGH SCHOOL

The action of some commercial drain cleaners is based on the following reaction: 2 NaOH(s) + 2 Al(s) + 6 H2O(l) → 2 NaAl(OH)4(s) + 3 H2(g) What is the volume of H2 gas formed at STP when 6.32 g of Al reacts with excess NaOH?

Answers

Answer 1

Answer:

Answer : The volume of $H_2$ gas formed at STP is 7.86 liters.

Explanation :

The balanced chemical reaction will be:

$2NaOH(s)+2Al(s)+6H_2O(l)\rightarrow 2AnAl(OH)_4(s)+3H_2(g)$

First we have to calculate the moles of $Al$ .

$\text{Moles of }Al=\frac{\text{Mass of }Al}{\text{Molar mass of }Al}$

Molar mass of Al = 27 g/mole

$\text{Moles of }Al=(6.32g)/(27g/mole)=0.234mole$

Now we have to calculate the moles of $H_2$ gas.

From the reaction we conclude that,

As, 2 mole of $Al$ react to give 3 mole of $H_2$

So, 0.234 moles of $Al$ react to give $(0.234)/(2)* 3=0.351$ moles of $H_2$

Now we have to calculate the volume of $H_2$ gas formed at STP.

As, 1 mole of $H_2$ gas contains 22.4 L volume of $H_2$ gas

So, 0.351 mole of $H_2$ gas contains $0.351* 22.4=7.86L$ volume of $H_2$ gas

Therefore, the volume of $H_2$ gas formed at STP is 7.86 liters.

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The balanced chemical equation for the reaction of copper (Cu) and silver nitrate (AgNO3) is shown below. Cu + 2AgNO3 mc001-1.jpg 2Ag + Cu(NO3)2 How many moles of copper must react to form 3.50 mol of Ag?

Answers

The balanced reaction is:

Cu + 2AgNO3 = 2Ag + Cu(NO3)2

We are givent the amount of silver to be produced. This will be the starting point. Calculations are as follows:

3.50 mol Ag ( 1 mol Cu / 2 mol Ag ) = 1.75 mol Cu

Therefore, we need 1.75 mol of copper in order to produce 3.50 mol of silver.

Answer:

1.75 moles of copper must react to form 3.50 mol of Ag.

Explanation:

$Cu + 2AgNO_3\rightarrow 2Ag + Cu(NO_3)_2$

According to reaction 2 moles of silver are obtained from 1 mole of copper.

Then 3.50 mole of Silver will be obtained from:

$(1)/(2)* 3.5 mol=1.75 mol$

1.75 moles of copper must react to form 3.50 mol of Ag.

Charge is important when covalent bonds form

true
False

Answers

True because they need charge in order to make a covalent bond I just learned that

If a sodium atom lost one of its electrons and a chlorine atom gained it, what kind of bond would be formed between sodium and chlorine?a. ionic
b. valence
c. metallic
d. covalent

Answers

This would be an ionic bond. Ionic bonds form between metals and nonmetals due to the relatively large different in electronegativities where nonmetals are more electronegative than metals. This difference in electronegativities makes it so that the metal gives up the electron to make an octet and the nonmetal gains the electron to make an octet (there is no sharing of the electron). The metal becomes a cation while the nonmetal becomes a anion and their opposite electric charges keep them together.

I hope this helps let me know in the comments if anything is unclear.

With no doubt, this type of bond would be ionic.

An ionic bond is when we transfer electrons. This means that the atoms would gain a charge.

Na+Cl- would be the resulting compound because:-

Na (sodium) loses : which means it would GAIN a positive charge.

Cl (chlorine) gains: which means it GAINS a negative charge.

When a 1.0 M solution of HCl is titrated with a 1.0 M solution of KOH, which is the approximate pH at the equivalent point?

Answers

The equivalence point is when the concentration of H⁺ in solution is equal to the concentration of OH⁻ in solution. Since H⁺ and OH⁻ react with each other to make water (H⁺(aq)+OH⁻(aq)→H₂O(l)) the pH at the equivalence point is 7 due to everything being neutralized. (The equivalence point only has a pH of 7 when a strong acid is being titrated with a strong base).

I hope this helps. Let me know if anything is unclear.

Answer:

Decreases abs basicity decrease

Explanation:

Which atom in the ground state requires the least amount of energy to remove its valence electron?(1) lithium atom (2) potassium atom (3) rubidium atom (4) sodium atom

Answers

Answer:

Rubidium (Rb)

Explanation:

Ionization Energy is defined as, "the minimum energy required to knock out or remove the valence electron from valence shell of an atom".

Trends in Periodic table:

Along Periods:

Ionization Energy increases from left to right along the periods because moving from left to right in the same period the number of protons (atomic number) increases but the number of shells remain constant hence, resulting in strong nuclear interactions and electrons are more attracted to nucleus hence, requires more energy to knock them out.

Along Groups:

Ionization energy decreases from top to bottom along the groups because the number of shells increases and the distance between nucleus and valence electrons also increases along with increase in shielding effect provided by core electrons. Therefore, the valence electrons experience less nuclear attraction and are easily removed.

Conclusion:

Given elements belong to same group hence, Rubidium present at the bottom of remaining elements will have least ionization energy due to facts explained in trends of groups above.

What can the arrow in a chemical reaction be translated to mean?

Answers

When a chemical equation is written out, there will be an arrow to represent the chemical reaction occurring. In the equation 6H20+6CO2-->6C12H6O+6O2, the part before the arrow is what you start out with. Next comes the arrow, or the reaction. After the reaction, you have the end product.

Answer:

The arrow means "yield" or "react to form".

Explanation: The arrow means "yield" or "react to form".

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