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frozen [14]
3 years ago
15

Which theory allows physical scientists to quantify or measure things like energy

Chemistry
1 answer:
Natali5045456 [20]3 years ago
6 0
Answer is: quantum theory (mechanics).
<span>Quantum theory is theory in </span>physics<span> which describes </span>nature<span> of energy levels of </span>atoms<span> and </span>subatomic particles. Quantum theory is formulated in different particularly developed mathematical formalisms.
According to this theory energy<span> of a system may be restricted to </span>discrete values<span> (</span>quantization<span>).</span>
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What needed to be present in marine mud to form fossil fuels?
UkoKoshka [18]
When organisms and plants died and sank to the bottom of swamps and oceans, brown soil-like materials called peat are formed. Over millions of years, the peat became covered with sand, clay and other minerals and the peat is converted into layers of sedimentary rocks. After a long time, different type of fossil fuels are formed.
8 0
3 years ago
You wish to prepare a buffer consisting of acetic acid and sodium acetate with a total acetic acetate plus acetate concentration
vovangra [49]

<u>Ans: Acetic acid = 90.3 mM and Sodium acetate = 160 mM</u>

Given:

Acetic Acid/Sodium Acetate buffer of pH = 5.0

Let HA = acetic acid

A- = sodium acetate

Total concentration [HA] + [A-] = 250 mM ------(1)

pKa(acetic acid) = 4.75

Based on Henderson-Hasselbalch equation

pH = pKa + log[A-]/[HA]

[A-]/[HA] = 10^(pH-pKa) = 10^(5-4.75) = 10^0.25 = 1.77

[A-] = 1.77[HA] -----(2)

From (1) and (2)

[HA] + 1.77[HA] = 250 mM

[HA] = 250/2.77 = 90.25 mM

[A-] = 1.77(90.25) = 159.74 mM



7 0
4 years ago
A steel block has a volume of 0.08 m³ and a density of 7,840 kg/m³. What is the force of gravity acting on the block (the weight
Rama09 [41]
Correct Answer: Option a. 6150.64 N

Weight (w) is defined as:

w = mg

So, first we need to find the mass (m) of the steel block using its volume and density.

Mass = Density x Volume 
So,
m = 0.08 x 7840 = 627.2 g

Using value of m and g = 9.807, we get

w = 627.2 x 9.807 = 6150.95 Newtons

Therefore, option a is the correct answer. 
The slight difference is because the value of g is rounded of to 3 decimal cases. 
6 0
3 years ago
Sodium sulfate dissolves as follows: Na2SO4(s) → 2Na+(aq) + SO42- (aq). How many moles of Na2SO4 are required to make 1.0 L of s
maxonik [38]

<u>Answer:</u> The number of moles of Na_2SO_4 is 0.05 moles.

<u>Explanation:</u>

To calculate the molarity of solution, we use the equation:

\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}

We are given:

Molarity of solution = 0.10 mol/L

Volume of solution = 1 L

Putting values in above equation, we get:

0.10mol/L=\frac{\text{Moles of sodium}}{1.0L}\\\\\text{Moles of sodium}=0.10mol

The chemical reaction for the ionization of sodium sulfate follows the equation:

Na_2SO_4(s)\rightarrow 2Na^+(aq.)+SO_4^{2-}(aq.)

By Stoichiometry of the reaction:

2 moles of sodium ions are produced by 1 mole of sodium sulfate

So, 0.10 moles of sodium ions will be produced by = \frac{1}{2}\times 0.1=0.05moles of sodium sulfate.

Hence, the number of moles of Na_2SO_4 is 0.05 moles.

8 0
3 years ago
Why is gas production not recognized as nitrate reduction?
Snezhnost [94]
The gas production not recognized as nitrate reduction is because <span>organisms that can ferment also produce gas. Therefore even if gas is produced on the tube, you can't tell if it's by fermentation or by nitrate reduction. I hope the answer helps. </span>
4 0
3 years ago
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