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3 years ago

6. As you go down a family or group on the periodic table *

Chemistry

2 answers:

maks197457 [2]3 years ago

4 0

Answer:

the atoms have more valence electrons

Explanation:

icang [17]3 years ago

4 0

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A precipitate of zinc hydroxide can be formed using the reaction below.

worty [1.4K]

Answer:

Option B is correct. KOH is the limiting reagent, and 0.27 mole of Zn(OH)2 precipitate is produced.

Explanation:

Step 1: Data given

Number of moles ZnCl2 = 0.36 moles

Number of moles KOH = 0.54 moles

Step 2: The balanced equations

ZnCl2(aq) + 2 KOH(aq) → Zn(OH)2(s) + 2 KCl(aq)

For 1 mol ZnCl2 we need 2 moles KOH to produce 1 mol Zn(OH)2 and 2 moles KCl

Step 3: Calculate the limiting reactant.

KOH is the limiting reactant. It will completely be consumed (0.54 moles). ZnCl2 is in excess. There will react 0.54/2 = 0.27 moles

There will remain 0.36 - 0.27 = 0.09 moles.

Step 4: The products

There will be produced 2 moles KCl and 1 mol Zn(OH)2. Zn(OH)2 is the precipitate produced.

For 1 mol ZnCl2 we need 2 moles KOH to produce 1 mol Zn(OH)2 and 2 moles KCl

For 0.54 moles KOH, we will produce 0.27 moles precipitate (Zn(OH)2)

Option A is not correct because 0.27 mol of Zn(OH)2 will precipitate, not 0.54 mol

Option B is correct

Option C is not correct because ZnCl2 is not the limiting reactant, but the excess reactant

Option D is not correct because ZnCl2 is not the limiting reactant, but the excess reactant

7 0

3 years ago

What happens when warm air rises? (5 points)

Alika [10]

The movement creates a difference in air pressure.

When warm air rises it goes up to top of atmosphere.
The cold air remains at bottom.
Which makes a blank space in between.
To fill that space air comes from all sides
Which makes difference in pressure.
It becomes reason for creation of Tornado, hurricane,Cyclones etc

7 0

2 years ago

Read 2 more answers

A refrigerator uses_________________________ energy to move the_________________________ through the refrigerator pipes.

denis23 [38]

Answer:

thermal; coolant

Explanation:

A refrigerator transfers thermal energy from the cool air inside the refrigerator to the warm air in the kitchen. I hope this helps! ^-^

7 0

2 years ago

Read 2 more answers

If the density of carbon tetrachloride is 0.893 g/mL, and a sample has a volume of 9.29 mL, what is the mass?

NNADVOKAT [17]

Answer:

8.3g

Explanation:

d=m/v

m=d*v

m=0.893*9.29

m=8.3g

3 0

2 years ago

Create a story and describe the motion (in meters) of an object that has traveled a distance but has no displacement. Need Help

vekshin1

Answer:

One complete revolution around a circular path.

Explanation:

Let us take the case of a car moving in a circular track of radius r metres.

In one revolution, the car covers the length(distance) equal to the perimeter of the circle.

In this case, distance traveled = 2 $\pi$ r metres

But after one complete revolution, the car reaches the same position as it was at the beginning of the motion.

Hence, the initial and final points coincide or the car hasn't changed it's position w.r.t the initial point.

So in this case, the displacement is zero.

Hence, revolution of a car around a circular path is an example of an object traveling a distance but having no displacement.

3 0

3 years ago