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vichka [17]
3 years ago
7

When the water level of a stream or river exceeds its natural banks, it has reached its

Chemistry
2 answers:
shusha [124]3 years ago
7 0
C. FLOOD STAGE is reached when the water level of a stream or river exceeds its natural banks.

Flood stage is a level at which a body of water's surface has risen to a sufficient level to cause sufficient inundation in areas that are not normally covered by water, causing inconvenience or a threat to life and/or property.

Yuki888 [10]3 years ago
7 0
When the water level of a stream or river exceeds its natural banks, it has reached it flood stage.
#answerisC
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A chemistry student is experimentally determining the boiling point
Hunter-Best [27]

Answer:

Option (e) should be discarded.

Explanation:

The given set of data is said to be precise if the values are close to each other. In this problem, a chemistry student is experimentally determining the boiling point  of bromine.

In this case, all values are close to each other but option (e) i.e. 56.3° should be discarded to make his data precise.

4 0
3 years ago
A wooden boat is discovered just south of the Graet Pyramid in Egypt had a Carbon-14 content of approximately 25% of that found
wolverine [178]

Because 25% is half of 0.5 and the half life of {}^{14}\text{C} is given as 5,715, the time it takes to reach this amount should just be double the half life: 11430 years.

However, in other cases the problem may not have easy numbers, so below is a more mathematical approach.

The half life formula is A=A_0*(\frac{1}{2} )^{\frac{t}{h} }.

Solving for t gives:

t=\frac{h*\ln(\frac{A}{A_0} )}{\ln(\frac{1}{2} )}

Given information:

A=0.25A_0\\h=5715\text{ yrs}

Plug in given values and solve for t.

t=\frac{5715 *\ln(0.25) }{\ln(\frac{1}{2} )} =11430 \text{ yrs}

With correct significant figures, this would be 11000 years.

6 0
3 years ago
A0C3H7OH + <br> a1O2 → <br> a2CO2 + <br> a3H2O
Kobotan [32]
2C₃H₇OH + 9O₂ = 6CO₂ + 8H₂O

a₀=2
a₁=9
a₂=6
a₃=8
5 0
3 years ago
Glycine, C2H5O2N, is important for biological energy. The combustion reaction of glycine is given by the equation 4C2H5O2N(s) +
Sergio039 [100]

Answer:

ΔH°f C₂H₅O₂N(s)  = -537.2kJ

Explanation:

Based on the reaction:

4 C₂H₅O₂N(s) + 9O₂(g) → 8CO₂(g) + 10H₂O(l) + 2N₂(g)

ΔHrxn = ΔH°f products - ΔH°f reactants.

As:

ΔH°fO₂(g) = 0

ΔH°fCO₂(g) = -393.5kJ/mol

ΔH°fH₂O(l) = -285.8kJ/mol

ΔH°fN₂(g) = 0

The ΔHrxn is:

ΔHrxn = (8×-393.5kJ/mol + 10×-285.8kJ/mol) - (4×ΔH°fC₂H₅O₂N(s)) = -3857kJ/mol

-6006kJ/mol - (4×ΔH°fC₂H₅O₂N(s)) = -3857kJ/mol

-4×ΔH°fC₂H₅O₂N(s) = 2149kJ/mol

ΔH°fC₂H₅O₂N(s) = 2149kJ/mol / -4

<h3>ΔH°f C₂H₅O₂N(s)  = -537.2kJ</h3>
5 0
3 years ago
Prescription drugs usually have a relatively __________.
GREYUIT [131]
High potential for harm and abuse
3 0
3 years ago
Read 2 more answers
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