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denpristay [2]
3 years ago
13

!!!10 points!!!Which of the following is a lanthanide?

Chemistry
1 answer:
Ymorist [56]3 years ago
6 0

Answer: B. Europium (Eu)

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Just need a letter so no that does not help
il63 [147K]
Like A B C D or like a mailed letter

3 0
4 years ago
Write the net ionic equation (including phases) that corresponds to fe(clo4)2
labwork [276]
1) The question is incomplete. What is the compound which Fe(ClO4)2 reacts with?

It could be one of several salts.

2) Assuming it is Na2S the complete reaction is:

<span> Fe(ClO4)2 (aq) + Na2S(aq) → FeS (s) + 2NaClO4 (aq)

So, the next steps how how to work this problem assuming that reaction.

3) Show the ionic compounds as separate ions.
</span><span>
Fe(2+) (aq) + 2 ClO4(-) (aq) + 2 Na(+) (aq) + S(2-) (aq) → FeS(s) + 2 Na(aq) + 2 ClO4(-) (aq)

That is the total ionic equation.

4) Cancel the ions that appear on both sides of the equation , Na(+) and ClO4(-).

Fe(2+) (aq) + S(2-) (aq) → FeS(s)  <-------- this is the net ionic equation

What happens to sodium and perchlorate is that they do not participate in the reaction but remain dissolved which is called "spectator ions".</span>


6 0
4 years ago
The percent errors of your experimental values of the specific heats may be quite large. Identify several sources of experimenta
valkas [14]

Answer:

The various sources of such errors are given below.

Explanation:

  • Sources of uncertainty or error could include necessary splattering of water leading to reduced cold water density as well as elevated temperatures of equilibration.
  • The temperature might not have been reasonably stable when developers evaluated at every phase of the investigation or research.

So that the percentage of someone specific produces heat exploratory value systems inaccuracies can be somewhat massive.

6 0
4 years ago
gas mixture with a total pressure of 765 mmHg contains each of the following gases at the indicated partial pressures: 131 mmHg
True [87]

Answer:

322mmHg

Explanation:

To calculate the partial pressure of the helium gas, we use the Dalton’s law of partial pressure.

It states that for a mixture of gases which do not react, the total pressure is equal to the sum of the individual partial pressures.

This means that:

Total pressure = Partial pressure of CO2 + partial pressure of Ar + Partial pressure of O2 + Partial pressure of helium.

Hence, Partial pressure of the helium gas = 765-131-226-86 = 322 mmHg

8 0
3 years ago
Solid iron has a density of 7.9 g/cm3.Liquid mercury has a density of 13.6 g/cm3. will iron float or sink in mercury explain
MAVERICK [17]
Iron will float since it is less dense.
8 0
4 years ago
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