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xeze [42]
3 years ago
9

How many molecules are there in 5H20? A.5 B.7 C.10 D.11

Chemistry
1 answer:
Ad libitum [116K]3 years ago
5 0

Answer:

the answers B which is 7

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Statement which represents chemical reaction
zvonat [6]

Answer:

второй ответ является правильным

Explanation:

химическое соединение заключается в том, что

6 0
3 years ago
How many joules of energy would it take to raise the temperature of 2.5 grams of magnesium metal from
garik1379 [7]

Answer:

Q = 63.75J

Explanation:

Mass = 2.5g

Initial temperature (T1) = 25°C

Final temperature (T2) = 50°C

Specific heat capacity of Mg = 1.020J/g°C

Heat energy = ?

Heat Energy (Q) = mc∇T

Q = heat energy

M = mass of substance

C = specific heat capacity of substance

∇T = change in temperature = T2 - T1

Q = mc∇T

Q = mc(T2 - T1)

Q = 2.5 × 1.020 × (50 - 25)

Q = 2.55 × 25

Q = 63.75J

The heat energy required to raise magnesium metal from 25°C to 50°C is 63.75J

4 0
3 years ago
Nuclear decay occurs according to first-order kinetics. What is the half-life of europium-152 if a sample decays from 10.0 g to
djyliett [7]

Answer:

13.5 years

Explanation:

Initial Concentration [Ao] = 10g

Final Concentration [A] = 0.768g

Time t= 50 years

Half life t1/2 = ?

These quantities are related by the following equations;

ln[A] = ln[Ao] - kt ......(i)

t1/2 = ln(2) / k ...........(ii)

where k = rate constant

Inserting the values in eqn (i) and solving for k, we have;

ln(0.768) = ln(10) - k (50)

-0.2640 = 2.3026 - 50k

50k = 2.3026 + 0.2640

k = 2.5666 / 50 = 0.051332

Insert the value of k in eqn (ii);

t1/2 = ln(2) / k

t1/2 = 0.693 / 0.051332 = 13.5 years

4 0
4 years ago
ANSWER ASAP!!!
lianna [129]

Answer:

The answer is c

Explanation:

6 0
3 years ago
Which list correctly aligns the levels of organisms from the least to the most complex? A. organ → system → tissue → cell B. tis
enyata [817]
It should be D, cells are parts, tissue is part and organ is part of a system.

6 0
3 years ago
Read 2 more answers
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