quick check answers: (you're welcomeee)
1. d
2. d
3. d
4. c
5. d
6. b
100% correct as i just finished it.
ANSWER: the original results have not been replicated consistently and reliably. | the only way for cold fusion to become a reliable theory is if scientists repeat this experiment is to make sure the results are repeatable. If a scientist cannot reproduce it anywhere in the world, then its deemed unaccepted as a theory.
Answer: ratio is 10⁻⁵
Explanation:
From Acid-dissociation equilibrium constant, HA is given thus,
HA + H₂O ⇄ H₃O⁺ + A⁻
equilibrium constant, Ka = [H₃O⁺] [A⁻] / [HA]
[H₃O⁺] = Ka [HA] / [A⁻]
from this we have that
pH = -log[H₃O⁺]
and pKa = -logKa
Applying Henderson-Hassel bach equation;
pH = pKa + log [A⁻]/[HA] ...........(1)
A⁻ rep the salt and HA rep the acid
at a given pH of 7, the pKa value of carboxylic acid COOH is 3
∴ from equation (1).
7 = 3 + log(COO⁻/COOH)
log(COO⁻/COOH) = 4
thus (COO⁻/COOH) = 10⁻⁴ ...................(2)
The ratio of alanine COOH to COO- at pH 7 is (COO⁻/COOH) = 10⁻⁴
(ii) Also considering the ratio of alanine NH2 to NH3+ at pH 7 we have;
given Pka value is 8,
therefore pH = pKa + log [salt]/[base]
7 = 8 + log (NH₂/NH₃)
(NH₂/NH₃) = 10⁻¹
thus the ratio of the concentration of the neutral amino acid species to the zwitterionic species at pH 7 is;
10⁻⁴ ˣ 10⁻¹ = 10⁻⁵
cheers i hope this helps
Answer:
Explanation:
The conclusion is the summary of the post experimental analysis. This involves the comparison of the results of the experiment with the theory and associated background literature related to the research or experimentation topic.
The purpose of the conclusion is to make a brief account of the findings of the research or experimentation process.
Answer:
A chemical reaction is a process in which one or more substances (reactants) are transformed into one or more different substances (products). During a chemical reaction, chemical bonds between atoms in the reactants are broken, and new bonds are formed to create the products. This transformation often involves the rearrangement of atoms and the exchange of energy.
Key characteristics of a chemical reaction include:
1. **Reactants:** These are the substances that undergo the chemical transformation. They are present before the reaction begins.
2. **Products:** These are the substances that result from the chemical reaction. They are formed as a result of the rearrangement of atoms from the reactants.
3. **Chemical Equations:** Chemical reactions are typically represented using chemical equations, which show the reactants on the left side and the products on the right side. For example, the reaction between hydrogen and oxygen to form water is represented as: 2H2 + O2 → 2H2O.
4. **Conservation of Mass:** In a closed system, the total mass of the reactants is equal to the total mass of the products, according to the law of conservation of mass.
5. **Energy Changes:** Chemical reactions may release or absorb energy. Reactions that release energy are exothermic, while those that absorb energy are endothermic.
Chemical reactions are fundamental to chemistry and play a crucial role in various natural and industrial processes. They are involved in everything from the digestion of food in our bodies to the combustion of fuel in engines, and they underlie the synthesis of a wide range of substances, from pharmaceuticals to materials used in everyday life. Understanding and controlling chemical reactions is essential in fields such as chemistry, biology, and engineering.
Answer:
a chemical reaction is a process in which two or more chemicals react with each other
The covalent bonds present in based on the valence electrons and thus form 4 bonds.
The valence electrons are the number of electrons present on the last orbital of the atom.
The atomic number of carbon is 6, thereby it is given with the electronic configuration 2, 4.
There is the presence of the 4 valence electrons in the carbon atom, and thereby the number of covalent bonds formed by carbon atom is 4.
Learn more about valence electrons, here:
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