Answer:
c. hydrogen-ion concentration
Explanation:
pH is a logarithmic measure of the hydrogen ion concentration of an aqueous solution pH = -log[H + ] where log is the base 10 logarithm and [H + ] is the hydrogen ion concentration in moles per liter
Answer:
73.4% is the percent yield
Explanation:
2KClO₃ → 2KCl + 3O₂
This is a decomposition reaction, where 2 moles of potassium chlorate decompose to 2 moles of potassium chloride and 3 moles of oxygen.
We determine the moles of salt: 400 g . 1. mol /122.5g= 3.26 moles of KClO₃
In the theoretical yield of the reaction we say:
2 moles of potassium chlorate can produce 3 moles of oxygen
Therefore, 3.26 moles of salt, may produce (3.26 . 3) /2 = 4.89 moles of O₂
The mass of produced oxygen is: 4.89 mol . 32 g /1mol = 156.6g
But, we have produced 115 g. Let's determine the percent yield of reaction
Percent yield = (Produced yield/Theoretical yield) . 100
(115g / 156.6g) . 100 = 73.4 %
Answer:
B. %73.40 on edge 2020
Explanation:
Took the quiz and got it right, hope this helped:)
(2) lead (Pb) (4) chlorine (Cl)
Answer: Option (1) and (2) are correct.
Explanation:
Elements which contain same number of valence electrons tend to show similar chemical properties. This is because having same number of valence electrons will make the atoms to react in a similar way.
For example, Silicon is a group 14 element. So, it contains only 4 valence electrons. Similarly, germanium and lead are group 14 elements and it has 4 valence electrons.
Therefore, silicon, germanium, and lead will have similar chemical properties.
Whereas phosphorous is a group 15 element, and chlorine is a group 17 element.
Thus, we can conclude that out of the given options germanium and lead elements has physical and chemical properties most similar to silicon (Si).
Explanation:
Neon is in group 8/0, which means that it has a full outer shell. Atoms react to get a full outer shell but as neon already has a full outer shell, it doesn't react and stays monatomic.
However, chlorine is in group 7, so it needs 1 more electron to complete its outer shell, two chlorine atom share one electron each with each other so they have full outer shells. This is why chlorine is diatomic.
The two analogies that I used to describe quantized change are;
- Notes on a Piano
- Digital Clock
Quantized change is simply means that the change is definite under certain restrictions such as the gears in our cars. This means that change comes in discreet amounts.
The 2 analogies that I can use to describe it are as follows;
1) Notes on a Piano; When we are turn on a piano, the notes on the piano are fixed and as such we can only play the notes that the keys can hit.
2) Digital clock; The representation of time in digital clocks is in terms of numbers which can be said to be discrete variables.
Read more at; brainly.com/question/12508919
Answer:
See explanation
Explanation:
1) A flight of stairs because there is a specific number of steps one may take at a particular time. That is, the number of steps that can be taken at a given time is not continuous.
2) The gear system of a car: The gear system of a car can only take whole number integer values. It is not continuous and only one level of gear can be attained at a given time.
Arrhenius acids are substances which produces hydrogen ions in solution, Arrhenius bases are substances which produces hydroxide ions in solution. A Bronsted-Lowry acid is a proton donor (usually hydrogen ion). And a Bronsted-Lowry base is a proton acceptor (usually hydrogen ion). Consider a chemical reaction between HCl and NaOH. We have the reaction HCl + NaOH à NaCl + H2O. The hydroxide ions in the NaOH are bases because they accept hydrogen ions from acids to form water. And an acid produces hydrogen ions in solution by giving a proton to the water molecule. Therefore, the answer is d. a Bronsted-Lowry base.