How does the amount of a substance affect the rate at which temperature changes?

1 answer:

5 0

The amount of heat energy transferred (out or in) depends on three factors:1. The capacity of the substance to absorb heat – called the specific heat capacity 2.The amount (moles) of the substances reacting3. The change in temperature
So its not the "amount" of the substance as much as the density of it (the moles). The more dense something is, the slower the rate.

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What are the electrons for calcium

IRINA_888 [86]

The traditional calcium atom has twenty protons and twenty electrons making it neutral.

The calcium in the pic is a calcium ion so the number of protons and electrons are not equivalent.

Since it's 2+ that means the ion is positively charged and for that to happen electrons are away.

So 20-2=18

There are 18 electrons

5 0

3 years ago

An electrochemical cell is composed of pure nickel and pure iron electrodes immersed in solutions of their divalent ions at room

Andrej [43]

Answer:

0.758 V.

Explanation:

Hello!

In this case, case when we include the effect of concentration on an electrochemical cell, we need to consider the Nerst equation at 25 °C:

$E=E\°-\frac{0.0591}{n} log(Q)$

Whereas n stands for the number of moles of transferred electrons and Q the reaction quotient relating the concentration of the oxidized species over the concentration of the reduced species. In such a way, we can write the undergoing half-reactions in the cell, considering the iron's one is reversed because it has the most positive standard potential so it tends to reduction:

$Fe^{2+}+2e^-\rightarrow Fe^0\ \ \ E\°=0.440V\\\\Ni^0\rightarrow Ni^{2+}+2e^-\ \ \ E\°=-0.250V$

It means that the concentration of the oxidized species is 0.002 M (that of nickel), that of the reduced species is 0.40 M and there are two moles of transferred electrons; therefore, the generated potential turns out:

$E=(0.440V+0.250V)-\frac{0.0591}{2} log(\frac{0.002M}{0.40M} )\\\\E=0.758V$

Beat regards!

8 0

3 years ago

The smallest particle of an element is a(n) .<br>atom<br>molecule<br>DNA

mamaluj [8]

Answer:

An atom is the smallest particle of an element

5 0

2 years ago

A solution with pH of 9 has [OH-] concentration of

Drupady [299]

PH = -log([H+])
[H+] = 10^(-pH)

[H+] = 10^(-9)

[H+][OH-] = Kw
Kw = 1.0*10^-14 at 25 degrees celsius.

[OH-] = Kw/[H+] = (1.0*10^-14)/(1*10^-9) = 1.0*10^-5

The concentration of OH- ions is 1.0*10^-5 M.

7 0

3 years ago

A sample of air has a volume of 140.0 mL at 67C. To w

bonufazy [111]

Answer:

What that means is that when pressure and number of moles are kept constant, increasing the temperature will result in an increase in volume. Likewise, a decrease in temperature will result in a decrease in volume. In your case, the volume of the gas decreased by a factor of about 3, from "140.0 mL" to "50.0 mL".

7 0

2 years ago