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3 years ago

What is a component of the solar system that revolves around the sun and is made of ice, gas, rock, and dust?

Chemistry

1 answer:

olasank [31]3 years ago

8 0

Answer:

comets

Explanation:

Comets have been called "dirty snowballs." They are small celestial objects, made of ice, gas, dust, and a small amount of organic material, that orbit our Sun. There are about 1000 known comets and more are discovered each year.

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Explain your thoughts on whether or not using solely IR is a good method to make positive IDs of chemicals.

Fed [463]

Answer:

No, IR should not soely be used to identify molecules

Explanation:

IR is a method that identifies the functional groups in a molecule by deducing the frequency of stretching and vibration of bonds. Each peculiar type of bond has a frequency for the vibration of each bond represented on the IR spectrum.

However, one method is never enough to identify a compound. A combination of methods must always be used to clear up ambiguities arising from overlapping IR frequencies. Also, interpretation of the nuanced peaks of the fingerprint region in IR spectra is quite challenging and only gives a fair idea of the functional groups present in the compound.

Therefore other methods such as NMR, UV-VISIBLE etc should also be involved in the identification of compounds.

6 0

3 years ago

How many grams of Fe2O3 will be produced from 300 grams of FeCr2O7

Dennis_Churaev [7]

You should use sacratic ill help is an app

7 0

4 years ago

Give three examples of monoatomic molecules.

umka2103 [35]

Answer:

Helium

Radon

and Neon

Explanation:

5 0

3 years ago

Chemical properties

ehidna [41]

The answer is C

Chemical properties or chemical changes are the ones which include changes that alter the identity of a substance. For example: burning of any substance which is also called combustion. You burn a piece of paper it changes its identity. It was cellulose fibres earlier now it’s ash after burning.
You burn petrol it was mixture of hydrocarbons but when burnt it changes to smoke which is just gases like carbon dioxide or nitrogen oxides. This is a chemical change

Changing of states is a physical change not chemical change. Think of meeting of ice the water molecules which were in solid state after melting become water molecules in the liquid state. Similarly, the evaporation or boiling will change the water molecules in the liquid state to the gaseous state also called its vapor state. These do not change identity it’s just the water molecules always may it be any state, solid, liquid or gaseous. So, boiling point and melting point are physical properties not chemical. The identity remains same during these processes.

Mass and color are not chemical properties. They don’t change identity when you measure them. If you weigh yourself on weight u won’t change into something else.

8 0

3 years ago

A solution of Co(NO₃)₂ is electrolyzed using a 15.0A current for 1.00 hour and Co(s) is produced at the cathode. Calculate the m

Katen [24]

Answer:

1. 0.56 mole of electron.

2. 0.28 mole of Co .

3. 16.52g of Co.

Explanation:

The following data were obtained from the question:

Current (I) = 15A

Time (t) = 1 hr = 1 x 60 x 60 = 3600secs

Next, we shall determine the quantity of electricity, Q flowing in electrolyte. This is illustrated below:

Quantity of electricity (Q) = current (I) x Time

Q = It

Q = 15 x 3600

Q = 54000C.

1. Determination of the moles of electrons used to electrolyzed the solution. This is illustrated below:

96500C = 1 mole of electron

Therefore, 54000C = 54000/96500 = 0.56 mole of electron.

Therefore, 0.56 mole of electron was used to electrolyze the solution.

2. Determination of the number of mole of Co produced at the cathode. This is illustrated below:

At the cathode:

Co2+ + 2e —> Co

From the balanced equation above,

2 moles of electron produce 1 mole of Co.

Therefore, 0.56 mole of electron will produce = 0.56/2 = 0.28 mole of Co.

Therefore, 0.28 mole of Co is produced at the cathode.

3. Determination of the mass of Co produced at the cathode. This can be achieved by doing the following:

Molar mass of Co = 59g/mol

Number of mole of Co = 0.28 mole

Mass of Co =..?

Mass = mole x molar mass

Mass of Co = 0.28 x 59

Mass of Co = 16.52g

Therefore, 16.52g of Co is produced at the cathode.

6 0

3 years ago