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m_a_m_a [10]
3 years ago
15

Show that an aqueous solution with a pH of 5 has a hydroxide ionconcentration of 1×10^9M​

Physics
1 answer:
vekshin13 years ago
5 0

Explanation:

pH + pOH = 14

5 + pOH = 14

pOH = 9

pOH = -log([OH⁻])

9 = -log([OH⁻])

-9 = log([OH⁻])

1×10⁻⁹ = [OH⁻]

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Layer T contains a well-known index fossil that is 120 million years old. Layer R contains a different index fossil that is 100
RSB [31]

Answer:

Between 100 and 120 million years old

Explanation:

The principle of superposition refers to one of the geological principles used in the determining the relative depositional history or sequence of rock stratas in geologic stratigraphic study. The superposition principle explains that rocks deposited in stratas with the oldest rock layer being at the base and the youngest at the topmost layer. Hence using this principle, we can conclude that ; Rock layer M lies in between layer T and R ; thus M is younger than T and older than R. Therefore, the age of M will be between the range of age T and R.

7 0
3 years ago
1. (15 points) Small cart is rolling down an inclined track and accelerating. It fires a ball straight out of the cannon as it m
Elena L [17]

Answer:

Explanation:

This problem can be solved with the conservation of the momentum.

If the ball is fired upward, the momentum before and after the ball is fired must conserve. Hence, the speed of the ball is the same that the speed of the car just in the moment in wich the ball is fired.

Hence, the result depends of the acceleration of the car. If the change in the speed is higher than the speed of the ball, it is probably that the ball will be behind the car or it will come back to the car.

If the ball is fired forward, and if the change in the speed of the car is not enogh, the ball will be in front of the car.

HOPE THIS HELPS!!

5 0
3 years ago
An object with a mass of 78 kg is lifted through a height of 6 meters how much work is done
il63 [147K]
We got the following:
m = 78kg
h = 6m
g = 9.8 m/sec^{2} ≈ 10 m/sec^{2}
----------------------------------------------------------------------------
A = ?

As we know A = Ep = mgh    ->      potential energy
so the answer would be A = 78 * 6 * 10 = 4680 Joule


5 0
3 years ago
A car traveled at an average speed of 60 mph for two hours. How far did it travel? 30 miles
bulgar [2K]

Answer:

120 miles

Explanation:

Speed = Δd/Δt

60 = d/2

Distance = 120 miles

8 0
3 years ago
Read 2 more answers
describe the advantages and disadvantages of bilingualism in childhood. Be sure to support your answer with information you lear
eduard
I have no idea what lesson you're talking about, but I am multilingual so I'm sure my answer can suffice for the small amount of details.

One advantage of being bilingual as a child is that, when faced with text written in a different language nobody else but you understands, you can save everyone's butt from taking out inaccurate translators for that text.

The disadvantage that follows that is the fact that people will now recognize you as that one dude that speaks every language, even if you don't. So, now, you have everybody coming up to you to translate everything they don't understand.

Another advantage is that you can read something everyone else would find disturbing (like, my graphic horror/action stories) without anybody understanding it because it's in another language.

The disadvantage that follows is that they're almost always going to be nosy brats and asking what every word means.

The last advantage I'll list is that you can get away with saying stuff. Like, "man, that woman must be on something", or, "darned drunkards", without starting up a fight with them, because, really, who's going to understand Thai way over in America? (I honestly wouldn't recommend risking it, though. Speaking of which...)

The last disadvantage here is the fact that you won't know who speaks these languages around you. For all you know, your best friend had understood every comment about the loony across the street and simply chose not to comment on it.

So, for the final conclusion, knowing different languages is great and all, but it's not that great.
5 0
4 years ago
Read 2 more answers
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