Answer: The concentration of unknown sample is 1.8 mg/ml
Explanation:
According to the dilution law,
where,
= concentration of stock solution = ?
= volume of stock solution = 0.25 ml
= concentration of diluted solution = 0.45 mg/ml
= volume of diluted solution = (0.25+0.75) ml = 1.00 ml
Putting in the values we get:
Therefore, concentration of unknown sample is 1.8 mg/ml
Answer:
Explanation:
This is a typical double replacement or double decomposition reaction. In this kind of reaction, it involves the combination of ionic compounds which exchange their partners to form new compounds. Typical of these reaction is the formation of precipitates which are insoluble compounds.
The reaction equation is shown below:
AgNO₃
+ K₂SO₄ → 2KNO₃ + AgSO₄
)
From the rule of solubility:
- All trioxonitrate(v) salts are soluble
- Salts of silver sulfates are slightly soluble. This will form the precipitate in the solution.
We can write the ionic equation as:
Ag⁺ + NO₃⁻ + 2K⁺ + SO₄²⁻ → AgSO₄
+ 2K⁺ + NO₃⁻
The spectator ions or non-reactive ions are those ions that appears on both sides of the equation. These ions are the potassium and trioxonitrate ions. We cancel them out to give the net ionic equation of the reaction:
Ag⁺ + SO₄²⁻ → AgSO₄
Claim is : chemical reactions are smaller
1.08 g/cm^3
(when multiplying or dividing you use the least amount of significant figures to answer your question by which is the 19.5. That gives you 3 significant figures.)
4.83 km
(when adding or subtracting however you use the least precise the 4.810 goes into the thousandths place which is more precise then the 0.08 which only goes to the hundredths place.)
The answer is definitely D: all of the above.
Catalyst, the temperature (think about the reaction of the dissolving sugar in the water), and the concentration of reactants (think about the nuclear reactions).
