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3 years ago

if a magnet is broken which one of the following remains unchanged in each part mass, magnetisation, length

Chemistry

1 answer:

Aleks [24]3 years ago

8 0

Explanation:

magnetization

coz it will still have two pols that is north and south pole

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Why does galium melt

levacccp [35]

Answer:

Like most other metals, Gallium is solid at room temperature (or liquid if it is too hot in your room). But, if it is held [in hands] for long enough, it melts in your hands, and doesn't poison you like Mercury would. This is because of its unusually low melting point of (~29 degree Centigrade).

- It melts once it reaches its melting point.

7 0

2 years ago

Match the following with their correct molecular weight. 2-butanone Propyl acetate 4-methyl-2-pentanone Butyl acetate Methanol E

Hatshy [7]

Answer:

2-butanone = 72.11 g/mol (option F)

Propyl acetate = 102.13 g/mol (option C)

4-methyl-2-pentanone = 100.16 g/mol (option D)

Butyl acetate = 116.16 g/mol (option B)

Methanol = 32.04 g/mol (option E)

Ethanol = 46.07 g/mol (option A)

Explanation:

Step 1: Data given

Molar mass of C = 12.01 g/mol

Molar mass of H = 1.01 g/mol

Molar mass of O = 16.00 g/mol

Step 2:

2-butanone = C4H8O

⇒ 4*12.01 + 8*1.01 + 16.00 = 72.11 g/mol (option F)

Propyl acetate = C5H10O2

⇒ 5*12.01 + 10*1.01 + 2*16.00 = 102.13 g/mol (option C)

4-methyl-2-pentanone = C6H12O

⇒ 6*12.01 + 12*1.01 + 16.00 = 100.16 g/mol (option D)

Butyl acetate = C6H12O2

⇒ 6*12.01 + 12*1.01 + 2*16.00 = 116.16 g/mol (option B)

Methanol = CH3OH = CH4O

⇒ 12.01 + 4*1.01 + 16.00 = 32.04 g/mol (option E)

Ethanol = C2H5OH = C2H6O

⇒ 2*12.01 + 6*1.01 + 16.00 = 46.07 g/mol (option A)

4 0

3 years ago

Which equation represents an oxidation-reduction reaction?

bazaltina [42]

In an oxidation-reduction reaction there is an exchange of electrons.

The exchange of electrons implies change in the oxidation states: at least one element increases its oxidation number while other reduces it.

By simple ispection you can predict that in the equation b. there is a change in oxidation states of Cl and Mn.

Now you can check it:

Equation 4H Cl + Mn O2 -> Mn Cl2 + 2H2 O + Cl2

oxidation sates 1+ 1- 4+ 2- 2+ 1- 1+ 2- 0

The oxidation state of Cl in HCl is 1- and it changed to 0 in Cl2

The oxidation state of Mn in MnO2 is 4+ and it changed to 2+ in MnCl2

Answer b.

3 0

2 years ago

Brian's family has a compost pile at home. They put all the weeds they pull up from the garden in it as well as any vegetable wa

gladu [14]

Answer:

Option - It would happen faster at warmer air temperatures

Explanation:

The chemical process of converting organic matter such as plants, litter into organic soil, or organic compost called decomposition and perform by decomposers such as fungus or bacteria.

Like all other living organisms, decomposers also live in an optimal range of temperature. The major decomposers normally lie in the range of 30 to 40-degree celsius. Any type of fluctuation in this range might slow down the reaction of decomposition.

7 0

2 years ago

What is the boiling point of cyclohexane at 620 mm hg?

Alchen [17]

The right answer is 271.78 degrees for cyclohexane.

For each liquid there is a precise relationship between pressure and boiling temperature, we can define the boiling temperature as the moment when the first bubble of vapor appears on the surface of a liquid.

8 0

2 years ago