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Nady [450]
3 years ago
10

Which of the

Chemistry
2 answers:
saul85 [17]3 years ago
6 0

Answer:

During chemical reactions, matter is neither

created nor destroyed; it just changes form.

Explanation:

MariettaO [177]3 years ago
3 0

Answer:

the second one.

Explanation:

it just changes.

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A certain material has a density of 0.2 g/ml is this material good for building a bridge or for making cushions for a couch
MArishka [77]

A bridge must be made of metal or concrete or other materials that are strong enough to withstand the forces of the traffic passing over it. I doubt that the material could do that.

If the substance is a metal foam, it would make a rather hard cushion.

If the substance is too soft, it would make a cushion.

If the substance has the right combination of softness and elasticity so that it returns to its original shape when you get up, it might be a good material for a cushion.

3 0
3 years ago
Manganese-58 has a half-life of about 3 seconds. If you have a 90.0 gram sample, how
Rus_ich [418]

Answer:

18.018 seconds.

Explanation:

Given that the half life of Manganese, Mn = 3 seconds. The initial sample mass = 90.0 gram, the final sample mass = 1.40 gram.

The general idea to the question is to look for the time it will take to decay from the initial mass that is 90 gram to 1.40 gram.

Therefore, we will be making use of the formula below;

J(t) = J(o) × (1/2)^t/t(hL).

Where t(hL) is the half life, t is the time taken, J(t)= mass after time,t and J(o) is the initial mass. So, let us slot in the values into the equation above.

1.4 = 90 × (1/2)^ t/3.

1.4/90 = (1/2)^t/3.

t/3 = log(0.5) (1.4/90).

+Please note that the 0.5 of the log is at the subscript).

That is the base 0.5 logarithm of (1.4/90) 0.01556 is 6.0060141295.

t = 3 × 6.0060141295.

t = 18.018 seconds.

4 0
3 years ago
Match the alkane names and structures.<br> -butane<br> -methane<br> -ethane<br> -propane
SpyIntel [72]

Answer:

Explanation:

Here is the names and matches of butane methane ethane propane

7 0
3 years ago
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Why would fluorine, chlorine, and bromine be placed in the same group (the halogens) in the periodic table of elements? (1 point
inna [77]

D. They share chemical properties.

7 0
3 years ago
What is the mass of 1.88 mol Na
Rina8888 [55]
The answer to your question:

1.88 moles Na is 43.22 grams
5 0
3 years ago
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