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3 years ago

2.When copper (II) nitrate reacts with sodium hydroxide, copper (11) hydroxide is produced.

Chemistry

1 answer:

Ann [662]3 years ago

7 0

Answer:

2Cu + S ~~~> Cu2S Copper (C) reacts with sulfur (S) to form copper sulfide as shown in the equation. A scientist adds 12.7 grams of Cu to 3.2 grams of S to start the reaction.

Explanation:

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Type the correct answer in the box. Given: SiO2 4HF → SiF4 2H2O In this chemical reaction, how many grams of HF are needed for 1

Tresset [83]

The mass of the substance is the product of the molar mass and the moles of the substance in the compound. The amount of the HF required in the reaction is 242 gm.

<h3>What is the relation of the mass and moles?</h3>

Mass is given as the product of the moles of the substance and of the molar mass of the substance in the compound.

Given,

Molar mass of Silicon dioxide = 60g/mol

mass of Silicon dioxide = 182 g

Molar mass of HF = 20 g/mol

Moles of the Silicon dioxide can be calculated as,

$\begin{aligned}\rm Moles &= \rm \dfrac{mass}{molar\;mass}\\\\&= {182}{60}\\\\&= 3.03\end{aligned}$

The balanced chemical reaction can be shown as,

$\rm SiO_{2} + 4HF \rightarrow SiF_{4} + 2H_{2}O$

From the reaction, it can deduce that,

1 mole of silicon dioxide reacts with 4 moles of HF

So, 3.03 moles of silicon dioxide reacts with 12.12 moles of HF

Mass of HF can be calculated as,

$\begin{aligned}\text{mass of HF} &= \rm moles \times \rm molar \; mass\\\\&= 12.12 \times 20\\\\&= 242 \;\rm g\end{aligned}$

Therefore, the reaction requires 242 gm of HF.

Learn more about mass here:

brainly.com/question/11558651

4 0

2 years ago

I. Boiling water and producing water vapor II. Freezing liquid water into ice cubes III. Mixing salt into a beaker of water unti

Nadusha1986 [10]

it would be A since water is a form of liquid and vapor is a type of gas

hope this helps!

5 0

3 years ago

How could you separate a mixture of acetone and alpha-naphthol?

puteri [66]

Answer : The mixture of acetone and alpha naphthol can be separated using simple distillation method.

Explanation :

The melting point of alpha naphthol is around 95 °C whereas boiling point of acetone is around 55°C. Therefore the mixture can be separated using simple distillation method.

In this method, the mixture is taken in a stoppered bottle which has a tube inserted through the stopper for passing the vapors .The container is gently heated. Acetone being volatile, gets converted to vapors at its boiling point. Since melting point of alpha naphthol is much higher than the boiling point of acetone, it remains in dissolved form and does not melt when the mixture is heated.

The vapors of acetone are passed through the tube and as they pass through the tube, they get condensed. The condensed liquid is collected in another container.

After all the acetone is evaporated, solid alpha naphthol is left at the bottom of the container.

In this manner, the mixture of acetone and alpha naphthol is separated.

8 0

3 years ago

solniwko [45]

The given 2 triangles are similar

Explanation:

Step 1 :

Given,

ABC is a triangle

N is the point on AB so that ∠ABC = ∠ ACN

We need to show that the triangles ABC and ACN are similar

Step 2 :

Two triangles are said to be similar if the corresponding angles are equal.

In the given triangles we have

∠A as the common angle

∠ABC = ∠ ACN

Since 2 angles of both the triangles are same, the third angle is also same, because the sum of the measures of all angles is 180 degrees

Hence the given 2 triangles are similar

4 0

3 years ago

Gasoline is used to power most of the cars in the United States and worldwide. The average fuel economy for a gasoline powered c

kotegsom [21]

Answer:

469 gallons

Explanation:

From the question given, we were told that:

For every 32 miles, 1 gallon of gasoline is consumed.

With the above information, we can obtain the number of gallon of gasoline consumed by a car per year i.e 15000 miles

This is illustrated below:

If 32 miles consumed 1 gallon of gasoline,

Therefore, 15000 miles will consume = 15000/32 ≈ 469 gallons of gasoline.

Therefore, 469 gallons of gasoline is consumed by the average car each year

The

7 0

3 years ago