Answer: Option (C) is the correct answer.
Explanation:
Periodic table has different symbols for individual elements which have been discovered till now. As a result, this periodic table is followed internationally as it is approved and doesn't have any flaws.
Thus, we can conclude that out of the given options, they are all recognized internationally is true about the symbols assigned to the elements.
Answer:
Sample B
Explanation:
When heat is added to a substance, the molecules and atoms vibrate faster. Since the speed for Sample B is higher this means it has a higher temperature as well.
Answer:
In physical changes no new materials are formed and the particles do not change apart from gaining or losing energy
Explanation:
Answer:
46.76 g
Explanation:
The reaction that takes place is:
First we <u>determine the limiting reactant</u>:
1.3 moles of SiO₂ would react completely with (3 * 1.3) 3.9 moles of C. There are not as many C moles, meaning that C is the limiting reactant.
Now we<u> convert C moles (the limiting reactant) into CO moles</u>, using <em>the stoichiometric coefficients</em>:
- 2.5 mol C * = 1.67 mol CO
Finally we <u>convert 1.67 moles of CO to gram</u>s, using its <em>molar mass</em>:
- 1.67 mol CO * 28 g/mol = 46.76 g