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3 years ago

Which one of the following atoms has the largest radius? Sr, Rb, K, Ca, Y

Chemistry

1 answer:

Alex17521 [72]3 years ago

6 0

Answer: Rb (rubidium) has a radius of 290 pm, making it have the largest of the 5 elements listed.

Explanation:

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8. Build a neutral lithium atom.

choli [55]

Answer:

Remove 1 electron

Explanation:

In the atom of each element, there are three subatomic particles viz: proton, neutron and electron. The number of proton (positively charged) and electron (negatively charged) determines the charge of that element. The more the proton, the more positively charged an ion is and vice versa for electron.

According to this question, a neutral atom of lithium (Li) with atomic no. 3 is given i.e. a lithium atom with charge 0. To make the lithium atom's charge change to +1, ONE ELECTRON MUST BE REMOVED OR LOST.

Note that, the proton number (atomic number) of an element does not change, rather the electron number changes in relation to the no. of protons.

3 0

3 years ago

4. The solubility of acetanilide in hot water is 5.5 g / 100 mL at 100oC and its solubility in cold water is 0.53 g / 100 mL at

Triss [41]

Answer:

89,4%

Explanation:

If you have a solutio of 2,5g of acetanilide in 50mL of water and you warm this solution to 100°C you will dissolve all acetanilide because the maximum solubility in 50mL will be:

5,5g / 100mL → 2,75g / 50mL.

Then, if you cold the water to 0°C the solubility in 50mL will be:

0,53g / 100mL → 0,265g / 50mL.

That means you will precipitate:

2,5g - 0,265g = 2,235g of acetanilide

The theoretical percent recovery will be:

2,2365g / 2,5g ×100 = 89,4%

I hope it helps!

7 0

3 years ago

Which orders the activities from the greatest to least impact to reduce consumption of fossil fuels?(1 point)

guapka [62]

Answer:

walk to work, carpool to work, drive alone to work

Explanation:

4 0

3 years ago

A gas mixture contains 10.0g of nitrogen and 5.00g of oxygen gas. calculate the partial pressure of oxygen gas in that mixture i

Alekssandra [29.7K]

The answer would be 0.85atm.

Have a nice day!

6 0

3 years ago

Complete the pie chart formula. (Category/ ) × 360° = Portion of graph.

iVinArrow [24]

Answer:

A toy car has a 1.5-A current, and its resistance is 2 . How much voltage does the car require?

Explanation:

4 0

3 years ago