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4 years ago

How did Democritus characterize atoms?

Chemistry

1 answer:

Afina-wow [57]4 years ago

4 0

He states that atoms are indivisible and indestructible

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Calculate the mass in grams of 0.0420 moles of copper

galben [10]

4.2 grams i think i hope this helps

8 0

3 years ago

Give the number of significant figures in this number: 0.115

Reptile [31]

Answer:

It has 3 significant figures

Explanation:

Numbers after decimal are significant figures and zero before decimal is not a significant number.

Hence significant figures are 1,1&5

8 0

3 years ago

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He difference between elements and compounds is that...

Katarina [22]

A- elements have only one type of atom but compounds have multiple

4 0

3 years ago

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Consider the reaction: A (aq) ⇌ B (aq) at 253 K where the initial concentration of A = 1.00 M and the initial concentration of B

Ugo [173]

Answer:

The maximum amount of work that can be done by this system is -2.71 kJ/mol

Explanation:

Maximum amount of work denoted change in gibbs free energy $(\Delta G)$ during the reaction.

Equilibrium concentration of B = 0.357 M

So equilibrium concentration of A = (1-0.357) M = 0.643 M

So equilibrium constant at 253 K, $K_{eq}= \frac{[B]}{[A]}$

[A] and [B] represent equilibrium concentrations

$K_{eq}=\frac{0.357}{0.643}=0.555$

When concentration of A = 0.867 M then B = (1-0.867) M = 0.133 M

So reaction quotient at this situation, $Q=\frac{0.133}{0.867}=0.153$

We know, $\Delta G=RTln(\frac{Q}{K_{eq}})$

where R is gas constant and T is temperature in kelvin

Here R is 8.314 J/(mol.K), T is 253 K, Q is 0.153 and $K_{eq}$ is 0.555

So, $\Delta G=8.314\times 253\times ln(\frac{0.153}{0.555})mol/K$

= -2710 J/mol

= -2.71 kJ/mol

4 0

3 years ago

Which of the following halogens has the largest atomic radius?

pickupchik [31]

Answer:

$\boxed {\boxed {\sf B. \ Iodine }}$

Explanation:

Atomic radius is the measurement from the nucleus to the outer edge of the electron cloud.

As you go down a group (vertically) the atomic radius increases because more electron shells are added. As you go across a period horizontally, the atomic radius decreases.

If we look at the halogens group (17), we see they follow this order from top to bottom:

F - Fluorine

Cl - Chlorine

Br - Bromine

I - Iodine

Since it increases down the group, iodine must have the largest atomic radius.

4 0

3 years ago