What law determines that chemical equations must be balanced? What does this law say?

Answers

Answer 1

Answer: This is seen in the first law of Thermodynamics stating that matter and energy cannot be destroyed nor created.

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Find the [H+] in an acetic acid solution that has a pH of 5.12

Answers

Data:
pH = 5.2
[H+] = ?

Knowing that: (Equation to find the pH of a solution)
$pH = -log[H+]$

Solving:
$pH = -log[H+]$
$5.2 = - log [H+]$
Knowing that the exponential is the opposite operation of the logarithm, then we have:
$[H+] = 10^(-5.2)$
$\boxed{\boxed{[H+] = 6.30*10^(-6)}}\end{array}}\qquad\quad\checkmark$

An archaeologist discovered some charcoal at an excavation site. He sent the samples to a lab for C-14 dating, knowing that the half-life of C-14 is approximately 5,600 years. The lab reported that the charcoal had 1/8 the amount of C-14 in it that a living sample would have. How many years oldwas the charcoal?
A. 700 years
B. 1,867 years
C. 8,400 years
D. 16,800 years
E. 44,800 years

Answers

here we assume that disintegration has occur so the normal t½ formular will not be used
mathematically we..⅛×5600 =700
therefore it is about 700years option A

Photosynthesis produces carbon dioxide and energy

carbon dioxide and oxygen

glucose and oxygen

glucose and carbon dioxide

Answers

Photosynthesis produces glucose and oxygen.... Respiration on the other hand would produce the other options.

Answer: Since most of the dissolved CO2remains as CO2 molecules, Ka1(apparent) has a much larger denominator and a much smaller value than the true Ka1. The bicarbonate ion is an amphoteric species that can act as an acid or as a base, depending on pH of the solution. At high pH, it dissociates significantly into the carbonate ion (CO2−3):

Explanation: In organisms carbonic acid production is catalysed by the enzyme, carbonic anhydrase. CO2 is a potent electrophile having an electrophilic reactivity that is comparable to benzaldehyde or string α,β-unsaturated carbonyl compounds. However, unlike electrophiles of similar reactivity, the reactions of nucleophiles with CO2 are thermodynamically less favored and are often found to be highly reversible. Only very strong nucleophiles, like the carbanions provided by Grignard reagents and organolithium compounds react with CO2 to give carboxylates. In metal carbon dioxide complexes, CO2 serves as a ligand, which can facilitate the conversion of CO2 to other chemicals. The reduction of CO2 to CO is ordinarily a difficult and slow reaction:

According to the law of conservation of energy, the energy released by the system must be transferred to and absorbed by the surroundings

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True!
Energy released by system is absorbed by surroundings.

5. Given the following equation: 8 Fe S8 8 Fes, what mass of iron is needed to react with16.0 grams of sulfur? How many grams of FeS are produced?

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18 grams of fes is produced

Magnesium and nitrogen react in a combination reaction to produce magnesium nitride: 3 Mg + N2 → Mg3N2 In a particular experiment, a 9.27-g sample of N2 reacts completely. The mass of Mg consumed is __________ g.

Answers

Mass is the amount of the substance present in the sample of the mixture, it is a quantitative measure. The mass of the magnesium consumed is 23.76 gm.

What is mass?

Mass of any substance is the product of the moles of the substance and the molar mass of the substance present in the sample mixture.

The reaction can be shown as,

$\rm 3 Mg + N_(2) \rightarrow Mg_(3)N_(2)$