Answer:
B
Explanation:
Tanya should slowly spin the tennis ball five times around an imaginary axis.
The earth revolves around the sun 1 time per year.
BUT
the earth rotates on its' axis, causing seasons, Summer, winter, autumn, spring
The answer is TRUE.
Energy is an extensive property, which means that it is in proportion to the amount of matter: more mass, more energy.
You can measure, for example, the internal energy per mol or per gram of several compounds or elements. then if you want to know the total internal energy of the system you have to multiply by the number of moles or grams, depending on the unit of the internal energy that you use.
Answer:
Option D. A redox reaction occurred.
Explanation:
From the question given above it evident that a redox reaction has occurred because there is a colour change when aluminum was introduced into the beaker containing blue solution of copper(II) nitrate.
The equation for the reaction is given below below:
2Al + 3Cu(NO3)2 —> 2Al(NO3)3 + 3Cu
The oxidation number of Al changes from 0 to +2 indicating oxidation and the oxidation number of Cu changes from +2 to 0 indicating reduction.
As the oxidation - reduction reaction occurs, a colour change is observed.
Answer:
- <u>Find out the concentraion of the acetic acid, calculate the number of moles, which is equal to the number of moles of baking soda, and then multiply by the molar mass of baking soda to convert to mass in grams.</u>
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Explanation:
You need the concentration of the <em>acetic acid.</em>
With the concentration you can find the number of moles of acid in the given 100mL of acetic acid solution.
- # of moles = molar concentration × number of liters of solution
By stoichiometry of the reaction, you determine the number of moles of <em>baking soda</em>:
CH₃COOH(aq) + NaHCO₃(aq) → CH₃COONa(aq) + CO₂(g) + H₂O(aq)
↑ ↑ ↑
<em>acetic acid baking soda gas</em>
From that balanced molecular equation, you find that 1 mole of acetic acid react with 1 mole of baking soda.
Then, using the molar mass of bakind soda, you convert the number of moles into mass in grams:
- mass in grams = number of moles × molar mass.
Then, adding that mass of baking soda, may be a little excess to be sure, all the acetic acid would be consumed getting the <em>largest amount of gas possible.</em>