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3 years ago

Which group contains elements that have the following characteristics:

1 answer:

6 0

actually the answer is B because Chlorine, sulfur, and silicon. Chlorine is a halogen and gas. Sulfur forms an ion with a -2 charge in ionic bonds. Silicon is a well-known metalloid.

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What is the atomic number z of 73li?

aev [14]

I think thats a trick question on the periodic table there is no Z, theres Zi which is zinc but no Z

3 0

3 years ago

Read 2 more answers

A person shuffles across the rug and then place his finger near his friend's nose, causing a small spark that transfers about 10

sineoko [7]

Answer:

$n = \frac{10^{-9}C}{1.6 x10^{-19}C}= 6.25 x10^{9} electrons \approx 6.3 x10^{9} electrons$

Explanation:

For this case we know that the charge associated to the transferred electrons of the small spark is $10^{-19}C$ and we want to find the number of electrons transferred.

From the properties of matter we know that the charge of the electron is

$q_e = |-1.6 x10^{-19}C |= 1.6 x10^{-19}C$

And we know that the total charge is given by this expression:

$Q = n e$

Where Q represent the charge, n the number of electrons and e the charge of the electron.

If we solve for n we got:

$n = \frac{Q}{e}$

And replacing we got:

$n = \frac{10^{-9}C}{1.6 x10^{-19}C}= 6.25 x10^{9} electrons \approx 6.3 x10^{9} electrons$

6 0

3 years ago

How is heat energy transferred from a warm object to a cold object there is direct contact?

sdas [7]

A is the answer!!!!!!!!!!!!

8 0

4 years ago

Read 2 more answers

How many slices of bread did each climber have to eat to compensate for the increase of the gravitational potential energy of th

ICE Princess25 [194]

Answer:

Each climber had to eat 72 slices of bread to compensate for the increase of the gravitational potential energy of the system climbers-Earth

Explanation:

One piece of bread releases about $1.0 \times 10^{6}J$ of energy in the body, but efficiency in converting the body's chemical energy into mechanical work is 9.5 %, so $1.0 \times 10^{6}J(9.5\%)=95\times 10^{3} J$ .

On the other hand, we need to calculate the total work to reach the top of Mt. Everest , so $W=mgh=(79 Kg)(9.8 m/s^{2})(8850 m)=6.8 \times 10^{6}J$

Finally, we have that $\# slices=\frac{W}{Energy/Slice} =\frac{6.8 \times 10^{6}J}{95\times 10^{3} J} =72 \ slices \ of \ bread$

8 0

3 years ago

When does a full moon happen?

Crank

Light of the moon is from the light of the sun. So if you're in a certain area where the angle from where your seeing the moon happens to be where the sun's light shines throughout that area. You see a full moon. It's like shining a flashlight on a ball. You move around it and you see half of the light, quarter of the light or even none at all.

3 0

3 years ago