Answer:
Explanation:
Arrhenius defined an acid as a substance that interacts with water to produce excess hydrogen ions in aqueous solution.
A base is a substance which interacts with water to yield excess hydroxide ions, in an aqueous solution according to Arrhenius.
Bronsted-Lowry theory defined an acid as a proton donor while a base is a proton acceptor.
Answer:
The elements in this list are:
Silver, hydrogen, carbon, nitrogen, gold, magnesium, nickel, mercury.
Explanation:
Elements are chemical substances that can be found on the periodic table.
Answer: 35.4 grams
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.
![Molarity=\frac{n\times 1000}{V_s}](https://tex.z-dn.net/?f=Molarity%3D%5Cfrac%7Bn%5Ctimes%201000%7D%7BV_s%7D)
where,
Molality = 2.65
n= moles of solute =?
= volume of solution in ml = 445 ml
Putting in the values we get:
![2.65=\frac{n\times 1000}{445ml}](https://tex.z-dn.net/?f=2.65%3D%5Cfrac%7Bn%5Ctimes%201000%7D%7B445ml%7D)
![n=1.18](https://tex.z-dn.net/?f=n%3D1.18)
Mass of solute in g=![moles\times {\text {molar mass}}=1.18mol\times 30.02g/mol=35.4g](https://tex.z-dn.net/?f=moles%5Ctimes%20%7B%5Ctext%20%7Bmolar%20mass%7D%7D%3D1.18mol%5Ctimes%2030.02g%2Fmol%3D35.4g)
Thus 35.4 grams of
is needed to prepare 445 ml of a 2.65 m solution of
.
Answer:
A- observation
B- hypothesis
C,D,E- experiment
F- conclusion
Explanation:
Lucia has just carried out the scientific process. An observation refers to paying close attention to a particular phenomenon in nature. This leads to the proposition of an intelligent guess about the observed phenomenon. This intelligent guess is called a hypothesis.
The hypothesis now guides the design of an experiment designed to confirm or disprove the hypothesis. The results of the experiment now leads to the formulation of a conclusion as Lucia has just done.