HELP ASAP PLEASE!!!

1 answer:

8 0

1. Pure substances cannot be separated into any other kinds of matter, while a mixture is a combination of two or more pure substances.

2. A pure substance has constant physical and chemical properties, while mixtures have varying physical and chemical properties (i.e., boiling point and melting point).

3. A pure substance is pure, while a mixture is impure.

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What mass of Al would be obtained from the complete reduction of 10.2 tonnes of Al2O3?

Fynjy0 [20]

Answer:

5.4 tonnes.

Explanation:

The first step is to find the molar mass of Al2O3. Aluminum has a molar mass of about 27 and oxygen has a molar mass of about 16, so 2(27)+3(16)= 102g/mol=0.102kg/mol. 10200kg/0.102kg/mol=100,000 moles of Al2O3 in 10.2 tonnes. Multiplying this by the molar mass of the two aluminums, you get a total of 54*100,000=5400000g=5400kg=5.4 tonnes. Hope this helps!

3 0

3 years ago

True or False: Water molecules "stick together" due to hydrogen bonds.

Dimas [21]

Answer:

True

Explanation:

To begin with,

Hydrogen bonds are attractions that contain a force caused by the difference in charge. This is due to the positive hydrogen ions as well as slightly negative ions. Therefore, hydrogen bonds make water molecules 'sticky.' To add, the attractions between hydrogen bonds are weaker than ionic and covalent bonds but strong enough to cause them to 'stick together'

Hope this helps.

6 0

3 years ago

Calculate the specific heat capacity of a piece of ice if 1.30 kg of the wood absorbs 6.75×104 joules of heat, and its temperatu

spayn [35]

Answer:

1.8 J/ g ∘ C

Explanation:

A substance's specific heat tells you how much heat much either be added or removed from 1 g of that substance in order to cause a 1 ∘ C change in temperature.

The equation that establishes a relationship between specific heat, heat added or removed.

8 0

4 years ago

Read 2 more answers

Be sure to answer all parts. identify a, b, and c, intermediates in the synthesis of the five-membered ring called an α−methylen

Vanyuwa [196]

The complete reaction along with intermediates is given below, with each step highlighted in different color.

Step 1:
In this step an acidic proton at alpha position is abstracted from lactone moiety and corresponding enolate is formed, which is resonance stabilized. Both structures are shown. In this case LDA (Lithium diisopropylamide) acts as a base.

Step 2:
The enolate formed attacks on Methyl Iodide, as Iodide being greater in size is a good leaving group and alpha methyl moiety is generated.

Step 3:
This step is acid catalyzed Bromination. Bromine is added at alpha position.

Step 4:
This is elimination reaction and is according to Hofmann's Rule. Here less substituted alkene is generated.

7 0

4 years ago

Is the following equation balanced correctly? NaCl + H2 Na + 2HCl

slamgirl [31]

I think it’s you did this equation right!

They are equaled

NaCl + H2 Na + 2H Cl ✅

Good job

4 0

3 years ago