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kati45 [8]
3 years ago
5

Please help me with chemistry questions?

Chemistry
1 answer:
noname [10]3 years ago
4 0

The answer is option D

That is when an electric current is passed through liquid water, hydrogen gas accumulates at one electrode and oxygen gas accumulates at the other, a chemical change has occurred with energy being absorbed.  

This process is called electrolysis of water in which hydrogen gas accumulates at one electrode and oxygen gas accumulates at the other. In it decomposition of water occurs chemically using electricity as the energy source.  



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How much work is done in moving a load 15 meters using a force of 15 Newton’s
Svetradugi [14.3K]
Answer: 225 joules.

Explanation:


If this a one dimension problem, this is the motion is in the same direction of the force, the equation for work is:
Work = distance × force
⇒ Work = 15 m × 15 N = 225 joules.
This is a special case of the general equation 

Work = |F| |displacement| cosine (angle between the force and displacement)


When force and displacement are in the same direction, the angle is 0, so cos(0) = 1. This is the two vectors are parellel and the work is just the product of the two magnitudes (force and distance)
3 0
3 years ago
Is there currently a cure for HIV
Allisa [31]

Answer:

No

Explanation:

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3 years ago
The 3 principles of the kinetic theory
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Answer:

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5 0
4 years ago
A chemist wishing to do an experiment requiring 47Ca2+(half-life = 4.536 days) needs 5.00 g of the nuclide. What mass of 47CaCO
Artyom0805 [142]

Answer: The answer is 6.78 grams.

Explanation: The equation used for solving this type of problems  is:

\frac{N}{N_0}=(\frac{1}{2})^n

where, N_0 is the initial amount of radioactive substance, N is the remaining amount and n is the number of half lives.

Number of half lives is calculated on dividing the given time by the half life.

n = time/half life

Time is given as 48.0 hours and the half life is given as 4.536 days. let's make the units same and for this let's convert the half life from days to hours.

4.536days(\frac{24hours}{1day})

= 108.864 hours

So, n=\frac{48.0}{108.864}  = 0.441

Since 5.00 g is the required amount when the radioactive substance is delivered to the scientist, it would be the final amount that is N. We need to calculate the initial amount. Let's plug in the values in the equation:

\frac{5.00}{N_0}=(\frac{1}{2})^0^.^4^4^1

\frac{5.00g}{N_0}=0.737

N_0=\frac{5.00g}{0.737}

N_0 = 6.78 g

So, 6.78 g of the radioactive substance needs to be ordered.

4 0
4 years ago
The measures of the angles of △ABC are given by the expressions in the table. Angle Measure A ​​ (12x+12)∘ B 15° C (3x+18)∘ What
SOVA2 [1]

Answer:

Angle A = (12 × 9) + 12 = 108 + 12 = 120°

Angle C = (3 × 9) + 18 = 27 + 18 = 45°

Explanation:

if im not wrong this should be right

7 0
3 years ago
Read 2 more answers
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