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2 years ago

When gases are released from a reaction what type of change has occurred?

Chemistry

2 answers:

umka21 [38]2 years ago

3 0

Answer:

Color Changes. A change in color often indicates a chemical change.

Temperature Changes. Changes in temperature might also indicate a chemical change has occurred.

Precipitates. The formation of a precipitate is a sign that a chemical change has occurred.

Light Emission.

Gas Production.

Explanation:

Lesechka [4]2 years ago

3 0

Answer:

A chemical change has occurred.

Explanation:

A chemical change is accompanied by a change in the chemical composition of the substance.

A color change, formation of a precipitate, evolution of a gas , temperature change are the indications of a chemical change.

For example

$2AlCl_3 (aq)+3Na_2 CO_3 (aq)>Al_2 (CO_3 )_3 (s)+6NaCl(aq)$

Here we see the formation of a precipitate or an insoluble solid $Al_2(CO_3 )_3 (s)$

A chemical reaction is accompanied by a change in temperature.

Reaction in which heat is evolved is an exothermic reaction and reaction in which heat is absorbed is called as endothermic reaction.

Combustion reaction is an example in which heat and light is given off and it is exothermic.

Some reactions we see gas gets evolved. For example electrolysis of water produces Hydrogen and oxygen gas.

$2H_2O>2H_2+O_2$

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Enter your answer in the provided box. an aqueous solution containing 10 g of an optically pure substance was diluted to 500 ml

sladkih [1.3K]

Answer:

[α] = -77.5° / $\frac{\textup{dm-g}}{\textup{mL}}$

Explanation:

Given;

Mass of optically pure substance in the solution = 10 g

Volume of water = 500 mL

Length of the polarimeter, l = 20 cm = 20 × 0.1 dm = 2 dm

measured rotation = - 3.10°

Now,

The specific rotation ( [α] ) is given as:

[α] = $\frac{\alpha}{c\times l}$

here,

α is the measured rotation = -3.10°

c is the concentration

c = $\frac{\textup{Mass of optically pure substance in the solution}}{\textup{Volume of water}}$

c = $\frac{10}{500}$

c = 0.02 g/mL

on substituting the values, we get

[α] = $\frac{-3.10^o}{0.02\times2}$

[α] = -77.5° / $\frac{\textup{dm-g}}{\textup{mL}}$

7 0

3 years ago

Which of the following samples will have the lowest pressure if they are all at the same temperature and in identical containers

snow_lady [41]

Answer:

c. 15 g Kr

Explanation:

The amount of a gas (Moles) is directely proportional to its pressure. That means the higher amount of moles, the highest pressure and vice versa.

Using molar mass of the compounds (Ne=20.2g/mol, Ar = 39.9g/mol, Kr = 83.8g/mol, CO₂ = 44 g/mol and F₂ = 38.0g/mol), moles of 15.0g of each gas are:

Ne = 15g ₓ (1mol / 20.2g) = 0.74 moles of Ne

Ar = 15g ₓ (1mol / 39.9g) = 0.38 moles of Ar

Kr = 15g ₓ (1mol / 83.8g) = 0.18 moles of Kr

CO₂ = 15g ₓ (1mol / 44g) = 0.34 moles of CO₂

F₂ = 15g ₓ (1mol / 38g) = 0.39 moles of F₂

<h3>As 15g of Kr contains the less quantity of moles, this sample will con have the lowest pressure</h3>

8 0

3 years ago

Using the information in the chart, the distance and displacement of each object can be determined. Which object has a distance

Zigmanuir [339]

Answer:

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2 years ago

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Find the number of moles of water that can be formed if you have 126 mol of hydrogen gas and 58 mol of oxygen gas.

Elden [556K]

Since a water molecule is H2O, you would divide 126 hydrogen molecules by 2, and you would get 63. That means you have 63 double hydrogen molecules, and 58 oxygen molecules to pair up with them. So that means you could have 58 molecules of water, with 5 double hydrogen molecules, so basically 10 extra molecules of hydrogen along with the H2O molecules. Hope I helped! :)

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photoshop1234 [79]

Answer:

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Explanation:

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2 years ago

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