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2 years ago

Consider the reaction: NaNO3(s) + H2SO4(l) NaHSO4(s) + HNO3(g) ΔH° = 21.2 kJ

Chemistry

1 answer:

masya89 [10]2 years ago

5 0

Answer:

endet nach selam nw

4gh7

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Which statements about fresh-water sources are true.? (Multiple Choice) (please help asap thanks!:)

Kay [80]

Answer:

The correct answers are:
"Only about 3 percent of Earth's water is fresh water."

"About 75% percent of the fresh water on Earth is frozen in ice sheets."

"The largest source of usable fresh water is groundwater."

Explanation:

3 percent of Earth's water is most certainly fresh water. Confirmed with a few fact checks.

The largest source of usable fresh water on Earth is groundwater. It's more difficult to access but it's there and much more usable than water say frozen in ice on the sea.

The most correct option left would be 75% of Earth's freshwater being in ice sheets even though it's about 70%.

3 0

1 year ago

A ball is rolling across the floor. Every 3 seconds it travels 12 meters. Its speed, therefore, is 36 m/s. Is this problem solve

kirill [66]

No because you are supposed to do this

$d = t)v$
T for time and V for velocity or acceleration so what you do is take the two numbers

D= 3/12 it goes 12 meters every 3 seconds so you devide 12/3
$12 \div 3 = 4$
So for every second the ball roles 4 meters!
Hope this helps! :)

7 0

2 years ago

A solution of ammonia has a pH of 11.8. What is the concentration of OH– ions in the solution?

melomori [17]

[OH-]: 0.0063095734448

7 0

2 years ago

Read 2 more answers

Choose all that apply. Nitrogen has an atomic number of 7. Its atomic mass is 14. Nitrogen has

Goshia [24]

The atomic number of calculated as number of protons + number of neutrons. The number of protons are the same as atomic number. This implies that Nitrogen has seven protons. To get the the number of neutron we minus atomic mass from number of protons
that is 14-7=7 neutrons

6 0

2 years ago

Write a complete, balanced equation for the following reactions:

lys-0071 [83]

Answer:

Solution given:

c) Magnesium metal plus silver acetate (teachers note:

Balanced chemical equation:

$\boxed{\bold{\green{Mg+AgC_{2}H_{3}O_{2}\rightarrow MgC_{3}H_{3}O_{2}+Ag^{+}}}}$

d) hydrobromic acid plus zinc metal (teachers note:

Balanced chemical equation:

$\boxed{\bold{\green{2HBr+Zn \rightarrow Be_{2}+H_{2}}}}$

6 0

2 years ago