5. Which of the following is a synthesis reaction? (2 points)2H2 + O2 → 2H2O
2H2O2 → 2H2O + O2
CaCO3 → CaO + CO2
2AgNO3 + Zn → 2Ag + Zn(NO3)2

Answer: 2Na + 2H₂O → 2NaOH + H₂

According to the equation, 2 moles of Na react with 2 moles of H₂O to produce 1 mole of H₂ gas.

To calculate the number of moles of Na in 120 g, we need to know the molar mass of Na, which is 22.99 g/mol. We can set up a conversion factor:

120 g Na * (1 mol Na / 22.99 g Na) = 5.22 mol Na

Since the reaction ratio is 2 moles of Na to 1 mole of H₂, we can set up another conversion factor:

5.22 mol Na * (1 mol H₂ / 2 mol Na) = 2.61 mol H₂

Now, to convert moles of H₂ to grams of H₂, we need to know the molar mass of H₂, which is 2.02 g/mol. Again, we set up a conversion factor:

2.61 mol H₂ * (2.02 g H₂ / 1 mol H₂) = 5.27 g H₂

Therefore, when 120 g of Na reacts with water, approximately 5.27 grams of hydrogen gas will be produced.

Note: Remember to round your final answer to an appropriate number of significant figures based on the given data.

Explanation:

Final answer:

To find the grams of hydrogen produced, we need to calculate the moles of Na, determine the moles of H2O using the mole ratio, and convert the moles of H2 to grams.

Explanation:

To determine how many grams of hydrogen are produced when 120 g of Na is available, we first need to calculate the moles of Na using its molar mass. Then, we use the balanced chemical equation to determine the mole ratio between Na and H₂O. Finally, we convert the moles of H₂ to grams. Here are the steps:

1. Calculate the moles of Na:
moles of Na = (mass of Na) / (molar mass of Na)

2. Determine the moles of H₂O using the mole ratio:
moles of H₂O = (moles of Na) x (moles of H₂O / moles of Na)

3. Convert the moles of H₂ to grams:
grams of H₂ = (moles of H₂) x (molar mass of H₂)

Using these steps and the given values, we can calculate the grams of hydrogen produced from 120 g of Na.

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Answer:

C.

Explanation:

Metals tends to lose electrons and form positive ions, known as cations. Whereas, non-metals tend to gain electrons and form negative ions known as anions.

Answer:

C. Metal, nonmetal

Explanation:

Fill in the blanks

The metal elements tend to lose electrons and form positive ions, while the non-metal elements tend to gain electrons and form negative ions.

Answer:

The reaction of an aqueous hydrochloric acid solution with an aqueous sodium hydroxide solution is represented by the neutralization chemical equation:

HCl(aq) + NaOH(aq) --> NaCl(aq) + H2O(l) + Energy

Explanation:

This is called a neutralization reaction, which is a reaction in which an acid and a base react to form water and a salt. This reaction involves the combination of H+ ions and OH- ions to generate water. pH equal to 7 is a neutralization of a strong acid and strong base. The neutralization of a strong acid and weak base will have a pH of less than 7, and conversely, the resulting pH when a strong base neutralizes a weak acid will be greater than 7.

When a solution is neutralized, it means that salts are formed from equal weights of acid and base. The amount of acid needed is the amount that would give one mole of protons (H+) and the amount of base needed is the amount that would give one mole of (OH-).

The production of sodium chloride and water is the indication that reaction took place.

• The formation of sodium chloride and water would be evidence that a chemical reaction took place because new substances are formed from the reaction hydrochloric acid (HCl) and sodium hydroxide (NaOH).
• When  hydrochloric acid (HCl) reacts with sodium hydroxide (NaOH), the sodium of NaOH combine with chlorine of HCl produces sodium chloride (NaCl).
• Whereas the hydrogen of HCl combine with hydroxide of NaOH so we can conclude that production of sodium chloride and water is the indication that reaction took place.

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Answer:

I think D. shift the equilibrium reaction to favor the endothermic process

Explanation: