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2 years ago

Why can three atoms of magnesium have different masses?

2 answers:

5 0

Answer: the atoms of those isotopes have the same atomic number (number of protons), making them belong to the same ele- ment, but they have different mass numbers (total number of protons and neutrons) giving them differ- ent atomic masses.

Explanation:

attashe74 [19]2 years ago

3 0

Answer:

Three atoms of magnesium can have different masses because each of the three atoms has a different number of neurons.

I hope this helped :)

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Show me step by step solution

Cloud [144]

Ok I may be young but combine the two reactions to create a compund

7 0

3 years ago

How many pounds of ice are required to absorb 4900 kJ of heat as the ice melts? The heat of fusion of water is 0.334 kJ/g.

Goshia [24]

Answer:

m = 32.34 pounds of ice.

Explanation:

In this case we need to use the following expression of heat:

q = m * ΔHf (1)

Where:

q: heat absorbed in J or kJ

m: mass of the compound in g

ΔHf: heat of fusion of the water in kJ/g

We are asked to look for the mass of ice in pounds, so after we get the grams, we need to convert the grams to pounds, using the following conversion:

1 pound --------> 453.59 g (2)

So, we have the heat and heat of fusion, from (1) let's solve for the mass, and then, using (2) the conversion to pounds:

q = m * ΔHf

m = q / ΔHf

m = 4900 / 0.334 = 14,670.66 g of ice

Now, the conversion to pounds:

m = 14,670.66 g * 1 pound/453.59 g

<h2>m = 32.34 pounds of ice.</h2>

Hope this helps

5 0

2 years ago

One problem with elimination reactions is that mixtures of products are often formed. For example, treatment of 2-bromo-2-methyl

NikAS [45]

Answer:

Structures are given below.

Explanation:

Treatment of 2-bromo-2-methylbutane with KOH in ethanol will give elimination of HBr through E2 mechanism.
H atoms adjacent to Br will be eliminated.
2-bromo-2-methylbutane has two possible adjacent H atoms that can be eliminated giving mixture of products.
Product of this elimination reaction is alkene. Here saytzeff fule is followed during elimination. So most substituted alkene will be major product.
Structure of alkenes are given below.

5 0

2 years ago

Is adding hot cocoa to hot water a chemical or physical change?

saul85 [17]

Adding hot cocoa to hot water would be a chemical change

6 0

3 years ago

Which of the following symbolic representations of matter signifies a mixture of elements?

andreev551 [17]

D only..

A is pure compound
B is mixture of compound and element
C is mixture of compounds
D is mixture of elements

7 0

2 years ago