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wolverine [178]
3 years ago
10

Choose the correct answer !

Chemistry
1 answer:
zavuch27 [327]3 years ago
4 0

Answer:

Osmium

Explanation:

The metals conduct electricity the best, in this question the metal would be osmium.

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1.How many moles of each element are in 0.0250 mol of K 2 Cr O 4?
garik1379 [7]

Answer:

1. In 0.0250 moles of potassium chromate there are 0.05 moles of potassium , 0.025 moles of chromium and 0.1 moles of oxygen are present.

2. In 4.50 moles of ammonium carbonate there are 9 moles of ammonium ions and 4.5 moles of carbonate ions are present.

Explanation:

1.

Moles of potassium chromate = 0.0250 mol

Formula of potassium chromate = K_2CrO_4

1 mole of potassium chromate has 2 moles of potassium , 1 mole of chromium and 4 moles of oxygen.

Then in 0.0250 moles of potassium chromate:

Moles of potassium will be:

2\times 0.0250 mol= 0.05 mol

Moles of chromium will be:

1\times 0.0250 mol= 0.025 mol

Moles of oxygen will be:

4\times 0.0250 mol= 0.1 mol

2.

Moles of ammonium carbonate = 4.50 mol

Formula of ammonium carbonate =(NH_4)_2CO_3

1 mole of ammonium carbonate has 2 moles of ammonium ion and 1  mole of carbonate ion.

Then in 4.50 moles of ammonium carbonate:

Moles of ammonium ion will be:

2\times 4.50 mol= 9mol

Moles of carbonate ions will be:

1\times 4.50 mol= 4.5 mol

8 0
3 years ago
how does increasing concentration/ temperature/ surface area affect the yield of products in a chemical reaction (not reversible
egoroff_w [7]
Answer:
             <span>Increasing concentration, temperature and surface area will increase the yield of products.

Explanation:
                   Concentration:
                                           
Increase in concentration of reactants will increase the number of reactants per unit volume. Therefore, the probability of collisions will increase hence, it will result in the increase in yield.

                   Temperature:
                                        Increase in temperature increases the kinetic energy of reactants. Therefore, the increase in velocity of reactants results in the collisions with high energy. It makes it feasible for reactants to attain the optimum energy (activation energy) to convert into products with good yield.

                  Surface Area:
                                       The reactants in grinded / powder form reacts fast as compared to solid form. In fact, grinding results in increase of the surface area of reactants. Greater surface area increases the probability of reactants to colloid. Hence, increases the yield.</span>
6 0
3 years ago
How many moles of NaOH are present in 25.0 mL of a 0.1000 M NaOH solution?
Kisachek [45]
25 * 10^-3 L * 0.1 Mole/L = 25*10^-4 Moles

Hope it helps.
4 0
3 years ago
Read 2 more answers
If aluminum is heated from 650°C to 670°C, then it will change from a A.liquid to a gas. B.liquid to a solid. C.solid to a liqui
kirill115 [55]
Answer: C

Explanation:
6 0
3 years ago
Match each state of matter to its description.
WARRIOR [948]

Answer:

Explanation:

solid would be a wall e.g

liquid would be water e.g

gas would be oxygen e.g

6 0
3 years ago
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