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4 years ago

10

Which reaction is not characteristic of an acid a)it dissolves magnesium oxide b) it produces ammonia from ammonium compounds c)

it produces carbon dioxide from a carbonate d) it produces hydrogen from zinc metal

1 answer:

Evgen [1.6K]4 years ago

4 0

Answer:

B（not sure）

Explanation:

a) 2HCl+MgO=H2O+MgCl2

c)2HCl+CaCO3=H2O+CaCl2+CO2

d)2HCl+Zn=ZnCl2+H2

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What does it mean to say that the electric current from a wall socket is “120 V AC”?

patriot [66]

I don't know what you are asking but AC= Alternative current
V= Volt

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3 years ago

A label on an empty sample container reads 12.00 g. You add in a sample of a compound and mass the sample container obtaining 15

Maksim231197 [3]

The mass of the sample reported is 3.5465 g option e is correct.

Mass is the quantitative measure of the physical body.

The mass of the empty sample container is given as 12 g.

The mass of empty as well as sample containers is given as 15.5465 g.

Therefore, the mass of the sample will be given as :

Mass of sample = mass of a sample as well as empty containers - a mass of empty sample container

= 15.5465 - 12

= 3.5465 g

Therefore, the mass of the sample reported is 3.5465 g option e is correct.

For more information click on the link below:

brainly.com/question/26150306

# SPJ4

Complete question:

Your question is incomplete, but most probably your full question was, A label on an empty sample container reads 12.00 g. you add in a sample of a compound and the mass of the sample container obtaining 15.5465 g. what should the mass of the sample be reported as?

a) 3.546 g

b) 3.54 g

c) 4 g

d) 4.0 g

e) 3.5465 g

8 0

2 years ago

Is acetone a compound, an element or heterogeneous or homogeneous

makvit [3.9K]

Answer:

Acetone is a compound.

4 0

3 years ago

Read 2 more answers

In which of the following cases would recrystallization be favored over extraction when purifying a mixture of two solid compoun

777dan777 [17]

Answer:

B. II.

Explanation:

The idea of recrystallization works when the solubility of the target substance decreases as the temperature of the solution decreases.

The method of recrystallization involves dissolving the solute in a suitable hot solvent and then allow the solution to cool gradually. The pure solute dissolves in the hot solvent and then separates out of the solution as it is cooled to room temperature.

Hence recrystallization is preferred over solvent extraction when the desired compound is poorly soluble in the solvent pair at low temperatures and greatly soluble in the solvent pair at high temperatures.

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3 years ago

When menthol, CH3OH, is burned in the presence of oxygen gas, O2, a large amount of heat energy is released. For this reason, it

Drupady [299]

We have the following balanced equation:

$CH_3OH_{(g)}+\frac{3}{2}O_{2\text{ (g)}}\rightarrow CO_{2\text{ (g)}}+2H_2O_{(l)}$

They also give us the heat of reaction equal to -764 kJ, i.e. it is an exothermic reaction.

By observing the reaction, we can deduce that for this heat to be generated, one mole of methanol is needed. Now let's see how many grams that mole of methanol equals. We will use the molecular weight equal to 32.04 g/mol

$\begin{gathered} g\text{ of methanol = 1 mol }\times\text{ 32.04 g/mol} \\ g\text{ of methanol }=\text{ 32.04 g} \end{gathered}$

Now we know the grams of methanol that generate 764 kJ, because the heat of reaction is directly proportional to the mass of the reactants, we can apply a rule of three to know the grams needed to produce a heat of reaction equal to 701 kJ:

$\begin{gathered} \frac{32.04\text{ g of methanol}}{764\text{ kJ}}=\text{ }\frac{x\text{ g of methanol}}{701\text{ kJ}} \\ x\text{ g of methanol = }\frac{32.04\text{ g of methanol }\times\text{ 701 kJ}}{764\text{ kJ}} \\ g\text{ of methanol = 29.4 g} \end{gathered}$

So, 29.4 g of methanol must be found to produce 701 kJ of heat

5 0

1 year ago