1-The answer rounded to the correct number of significant figures after Performing the following calculations (2.43 + 1.87×10 -2) × 4.67 is ............ 2-The melting point of Selenium is 217 °C. This melting point in degrees of °F is .................... 3- The following percentages: 60.4% Xe, 22.1% O, and F , the empirical formula of the compound is
States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
Fill in the blanks with the correct answer:
1-The answer rounded to the correct number of significant figures after
Performing the following calculations (2.43 + 1.87×10 -2) × 4.67 is ............
2-The melting point of Selenium is 217 °C. This melting point in degrees of °F is ....................
3- The following percentages: 60.4% Xe, 22.1% O, and F , the empirical formula of the compound is ....................
4- The volume in (mL) needed from 0.353M of H2SO4 solution to neutralize the solution of Ba(OH)2 with 20.0 mL volume and 0.432M concentration. The answer is ...........
5- The mass (in g) of Ca in 16400 mg CaCl2 is ..................
6- The oxidation number of P in Ca3(PO4)2 is ...................
7- The oxidizing agent in the following
5Fe+2(aq) + MnO4-(aq) + 8H+(aq) 5Fe+3 + Mn+2(aq) + 4H2O(l)
8- Bromine (Br) has two isotopes, with masses of 78.92 and 80.92 amu. The natural
9- In the following reaction, The spectator ions are .......................
Pb(NO3)2(aq) + 2NaCl(aq) PbCl2(s) + 2NaNO3(aq)
10- A 1.056 g of a metal carbonate MCO3(s), containing an unknown metal M, were heated to give the metal oxide and 0.376 g CO2.
MCO3(s) + heat MO(s) + CO2(g)
The identity of the metal M is .....................
11- Consider the following equation: 2C2H6 + O2 4 CO2 + 6 H2O
When 6 mol of C2H6 are burned, the number of moles of CO2 produced will be ..........
- Consider the unbalanced reaction:
Al + O2 Al2O3
12- The limiting reactant of the reaction is ..............
13- The mass of Al2O3 in g produced from the reaction mixture of 3.82 g Al and 6.40 g O2 is ..................
14- If 5.75 grams of Al2O3 are actually obtained in laboratory experiment. The % yield of Al2O3 is ............
15- The name of the compound with formula, Ba3P2 is ................
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