Answer:

Explanation:
B.

BALANCED. 7C, 16H, and 22O on each side of equation.
A.

NOT BALANCED. 7C on left and 6C on right.
C.

NOT BALANCED. 16H on left and 10H on right.
D.

NOT BALANCED. 7C on left and 14C on right.
An ionic compound can be formed through the existence of valency above the compound e.g NH4 which have +3 as it's ionic charge
We have that energy=specific heat * change in temperature * mass. Thus, we have the final temperature (22) minus the initial temperature (55) to equal -33 as our change in temperature. Our specific heat is in J/g*C, so we're good with that because g stands for grams and the aluminium is measured in grams. As there are 10 grams of aluminum, we have

as our final temperature
An exothermic reaction would release energy and would therefore lose heat itself, while an endothermic reaction would absorb energy and gain heat. Therefore, losing heat would be an exothermic reaction
Feel free to ask further questions!
Explanation:
It is given that, the Average Speed of the orbiting space shuttle is 17500 miles/hour.
We need to convert the speed in kilometers/
second
We know that,
1 mile = 1.609 km
or
1 km = 0.621 miles
1 hour = 3600 seconds

Now cancel the miles in numerator.

So, 17500 miles/hour is equal to 7.82 km/s.