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jok3333 [9.3K]
3 years ago
7

What percentage of a substance remains after 7 half-lives have passed?

Chemistry
1 answer:
Mila [183]3 years ago
5 0

Answer:

Not really sure, buts its either B or C.

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How many kilograms of water can be evaporated from a 1 m2 surface of water in a lake on a hot, clear summer day, if it is assume
Vladimir79 [104]

Answer:

for example the same boat and a lot more to the right thing in this country is a good thing to say about it is not a fan game that I have a lot more than the

3 0
4 years ago
Is the answer B? Help
Masja [62]

Answer:

A

Explanation:

Hmm, so we have the following in the diagram

Pt(s)

Cl2(g)

Ag(s)

NaCl(aq)

AgNO3(aq)

Pt 2+, 4+, 6+  Though it states Pt is inert

Cl 2-

Ag 1+

Na 1+

NO3-

Anode definition: the positively charged electrode by which the electrons leave an electrical device.

Electrode definition: a conductor through which electricity enters or leaves an object, substance, or region.

Cations attracted to cathode pick up electrons

Anions attracted to anode release electrodes+

Reduction at Cathode (red cat gain of e)

Oxidation at Anode (ox anode loss of e)

So from the diagram we can see that the charge is being generated through the 2 metal plates.

So the answer is A, the anode material is Pt and the half reaction is 2Cl- = Cl2 + 2e-

7 0
3 years ago
How many grams of the molecule glucose C6H12O6 would be required to make 1 L of a 0.5 M solution of the molecule?
soldier1979 [14.2K]

Answer:

90g

Explanation:

We need to find the molar mass of C6H12O6. This is done below:

MM of C6H12O6 = (12x6) + (12x1) + (6x16) = 72 + 12 + 96 = 180g/mol

From the question, we obtained:

Volume = 1L

Molarity = 0.5M

Number of mole = Molarity x Volume

Number of mole = 0.5 x 1 = 0.5mol

Mass conc of C6H12O6 = number of mole x MM = 0.5 x 180 = 90g

6 0
3 years ago
What interment that mesure air pressure
vova2212 [387]
The instrument that measures air pressure is called a barometer. It measures the wind pressure and it is easy to move and read.

Hope I helped!

- Amber
4 0
3 years ago
In order to ice to melt it must absorb heat This makes it an blank process.
sveta [45]

Answer: A. Endothermic

Explanation:

In an endothermic reaction, heat is sucked in from the surrounding area by the reactants so that they may use it to react and form new products. This will therefore reduce the temperature in the said surrounding by the amount that the reaction needed.

This is what ice does when it melts. It sucks in the heat surrounding the area and then melts but leaves the area colder. For instance, putting ice in water ensures that the ice melts but because it sucked in the heat from the water to do so, the water gets colder as a result.

7 0
3 years ago
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