A student is trying to distinguish elements from compounds. If a substance is an element, what else must be true about it?
1 answer:
Answer: A. It can be found on the periodic table. E. It is made of only one type of atom.
Explanation: Element is the pure substance which is made up of similar atoms and cannot be separated into its components. Example : Al
Compound is the pure substance which is made up by combination of two or more elements in a fixed ratio by mass. Example :
A) Every element can be found on the periodic table.
B) Element can be a solid, liquid or a gas.
C) Elements can be separated into different components as it is made up of only single type of atoms.
D) Only solids have fixed shape and volume.
E) Elements are made up of only one type of atoms.
You might be interested in
Answer:
11.9 is the pOH of a 0.150 M solution of potassium nitrite.
Explanation:
Solution : Given,
Concentration (c) = 0.150 M
Acid dissociation constant =
The equilibrium reaction for dissociation of (weak acid) is,
initially conc. c 0 0
At eqm.
First we have to calculate the concentration of value of dissociation constant .
Formula used :
Now put all the given values in this formula ,we get the value of dissociation constant .
By solving the terms, we get
No we have to calculate the concentration of hydronium ion or hydrogen ion.
Now we have to calculate the pH.
pH + pOH = 14
pOH =14 -2.1 = 11.9
Therefore, the pOH of the solution is 11.9