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3 years ago

Which type of combination is a mixture?

Chemistry

1 answer:

DochEvi [55]3 years ago

8 0

Answer:

C. physical

Explanation:

A mixture is a physical combination. Mixtures are combinations of compounds and molecules without any chemical reaction taking place.

Mixtures have the following properties:

They have an indefinite composition i.e they consist of two or more elements and or compounds in any proportion by mass
Their constituents retains their identities i. e physical property is retained.
Their constituents reacts differently to changed conditions.
They are easily separated into constituents by physical methods

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A sample of Ne gas has a pressure of 654 mmHg with an unknown volume. The gas has a pressure of 345 mmHg when the volume is 495m

Lemur [1.5K]

Answer:

The initial volume of Ne gas is 261mL

Explanation:

This question can be answered using Ideal Gas Equation;

However, the following are the given parameters

Initial Pressure = 654mmHg

Finial Pressure = 345mmHg

Final Volume = 495mL

Required

Initial Volume?

The question says that Temperature is constant;

This implies that, we'll make use of Boyle's law ideal gas equation which states;

$P_1V_1 = P_2V_2$

Where $P_1$ represent the initial pressure

$P_2$ represent the final pressure

$T_1$ represent the initial temperature

$T_2$ represent the final temperature

$P_1 = 654mmHg\\P_2 = 345mmHg\\V_2 = 495mL$

Substitute these values in the formula above;

$654 * V_1 = 345 * 495$

$654V_1 = 170775$

Divide both sides by 654

$\frac{654V_1}{654} = \frac{170775}{654}$

$V_1 = \frac{170775}{654}$

$V_1 = 261.123853211$

$V_1 = 261mL$ (Approximated)

The initial volume of Ne gas is 261mL

7 0

3 years ago

After learning about climate change in her science class, selena wants to make a few changes at home so she can affect climate c

ivanzaharov [21]

Selena can change from burning fossil fuel in her home to using solar energy.

<h3>What causes climate changes?</h3>

Climate change is caused by the release of the greenhouse gases which is gotten through the use and burning of fossil fuels such as coal.

The use of solar panels and solar energy by Selena in her house can help adjust the climate changes by decreasing the amount of greenhouse gases released into the atmosphere.

Learn more about greenhouse gases here:

brainly.com/question/20349818

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8 0

2 years ago

What type of bond is this combination likely to form

kari74 [83]

Answer:

A combination is certainly possible, but you should not take formal charges so literally

Normally, when a covalent bond is found, the two atoms both bring in one electron. As you identify correctly, in the case of nitric acid that would not be possible completely. If you draw the different possible resonance structures, the most likely structure has a single bond between the nitrogen and an oxygen where the oxygen has 3 lone pairs and both electrons in the bond are donated by the nitrogen. This makes the nitrogen "positive" and that oxygen "negative", but in fact the electrons move more freely in the molecule and charges are more distributed. You will not be able to find "the negatively charged" oxygen atom.

Explanation:

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3 years ago

Which statement is true about oxidation and reduction in an electrochemical cell?

Mila [183]

Answer : The correct option is, (3) Oxidation occurs at the anode and reduction occurs at the cathode.

Explanation :

Electrochemical cell : It is a type of device which is used to convert the chemical energy into electrical energy during the redox reaction.

In the electrochemical cell, there are two electrodes. The electrode on which the oxidation takes place is called the anode (or negative pole) and the electrode on which the reduction takes place is called the cathode (or positive pole). This cell is connected by the salt bridge.

In the external circuit, the electrons flow from the anode (negative pole) to cathode (positive pole) through the voltmeter.

In the inner circuit, the ions flow through the salt bridge.

Hence, the correct option is, (3) Oxidation occurs at the anode and reduction occurs at the cathode.

7 0

3 years ago

Read 2 more answers

A mirror will reflect (3 points) all wavelengths of visible light that shine on it some wavelengths of visible light that shine

Effectus [21]

A answer.

" All wavelengths of visible light that shine on it. "

it will not reflect 100 percent of the brightness.

HOPE THIS HELPS

7 0

3 years ago