Which of the following statements about balancing reactions is false? If there is no coefficient or subscript, a one is implied. When coefficients are added, the type of compounds is changed in the chemical reaction. C Subscripts are multiplied by the coefficients to determine the number of atoms in a compound. Coefficients are added to compounds to ensure both sides of the reaction have equal numbers of each atom.

Write a balanced chemical equation for the following reactions and classify reactions. i. Liquid octane (C8H18) reacts with oxygen gas (O2) to form carbon dioxide and steam (gaseous water). ii. Solid sodium metal and water react to make sodium hydroxide and hydrogen gas.

Are the word equations correct? Are the balanced formula equations correct?

The concept of determining which reactant is limiting and which is in excess is akin to determining the number of sandwiches that can be made from a set number of ingredients. Assuming that a cheese sandwich consists of 2 slices of bread and 3 slices of cheese, determine the number of whole cheese sandwiches that can be prepared from 4444 slices of bread and 6969 slices of cheese. number of sandwiches:     Which of the two ingredients limits the number of sandwiches that can be made? slices of cheese slices of bread What quantity of the ingredient in excess remains? quantity of excess ingredient remaining:

Balance the following chemical equation. Note that a empty blank space will be interpreted as "1."   ___N2H4 (g) + ___N2O4 (g)  -->  ___N2 (g)  + ___H2O (g)

Question 25 of 97 Submit DDT was an insecticide used to prevent mosquito borne diseases. Due to the harmful effects on birds and fish, it is now banned in the US. However, other countries still use it to control mosquitos. It can be prepared by the reaction shown below. Determine the amount of DDT that can be produced and the percent yield for this reaction. 2C6H,CI + C2HOCI, – C,4H9CI, + H20 2 3 NEXT If a company in South America started with 1175 g of chlorobenzene (C6H5CI, MW 112.55 g/mol) and 538.5 g of chloral (C2HOCI3, MW 147.39 g/mol), set up the table below that represents 100% yield with the given reaction conditions. 2C6H,CI C2HOCI, C1.H,Cls H2O Before (mol) Change (mol) After (mol) O RESET 3.132 -3.132 3.654 -3.654 7.308 0. + -7.308 10.44 -10.44 MacBook Air F12 II F8 F10 F11 000 F9 20 F3 F7 F4 F5 F6 esc F2 F1 +.

Which of the following statements about the periodic table is TRUE? a. The alkaline earth metals are the most reactive group of elements b. The majority of elements on the table are metals c. All non-metals are gases at room temperature d. The most reactive non-metal is astatine

the reaction of 15 moles of carbon with 30 moles of oxygen will result in a theoretical yield of ____ moles of CO2 is what?

Directions: Balance first the chemical equation below by multiplying the coeffícient to the number of atoms of each element. Then, multíply it by the atomic mass or weight. Please refer to the periodic table of elements in recording for the atomic mass or weight of the elements Involved. Besure that the total mass of the reactant is equal to the mass of the product. This is the balance equation: 2H2 02 2H20 H=4 H=4 O=2 O=2 H=4x1=D4 g/mol O=2x16=32 g/mol H=4x1=D4 g/mol O=2x16-32 g/mol 36 g/mol 36 g/mol

The starting materials in a chemical reaction are called your "initial products". True False If the number of each type of atom on one side of the arrow differs from the number on the other side, the equation is still considered balance. True False Stoichiometry is the qualitative study of reactants and products in a chemical reaction. True False