What statement is true? O Law of conservation of mass means that number of atoms of the products is more than the number of atoms of the reactants. O New chemicals formed in chemical reaction have a larger overall mass than the original reactants. O The total amount of matter (atoms) before and after chemical reactions remains the same. O Mass is created in a chemical reaction.

13.0 g of titanium reacted with 60.0 g of bromine. In this reaction, assuming 100% yield, 69.0 g of titanium(IV) bromide were produced and 4.01 g of titanium were left after the reaction. Which reactant was the limiting reactant? Which reactant was the excess reactant? Explain your reasoning using complete sentences.

How many total atoms are in the compound CuSO4?  How many elements are in 2H2SO4?  How many molecules are found in this formula 2Li3PO4?  How many atoms of carbon are found in glucose, C6H12O6?

On another planet, the isotopes of titanium have the given natural abundances. Mass (u) Isotope 46 Ti 48 Ti Abundance 72.700% 45.95263 10.500% 47.94795 50 Ti 16.800% 49.94479 What is the average atomic mass of titanium on that planet? u average atomic mass = - TOOLS x10

In a combustion reaction, 32.4 g of hydrocarbon reacts with 96.0 g of oxygen to produce water and carbon dioxide. If 60.6 g of water is produced, how much carbon dioxide is produced? Mass =

A chemical change is a change in composition resulting in a product with different properties.  True  False

When a chemical reaction occurs, atoms rearrange to form now compounds, but no new atoms are created nor are any destroyed This concept is called conservation of mass. Mass conservation can be seen in a balanced chemical equation where the numbers of each kind of atom are the same on both sides of the reaction arrow. The figure (Figure 1) shows the reaction of element A (lavender spheres) with element B (tan spheres). Write the balanced chemical equation for this reaction in terms of A and B. Express your answer as a chemical equation. When balancing chemical equations with polyatomic ions, it may help to balance the ion as a whole. For example, the ion PO_4^3 can be treated as a unit and balanced in both the reactants and the product, or you can break it down and balance each atom separately. Phosphoric acid reacts with magnesium hydroxide to produce magnesium phosphate and water via the following reaction: Balance the equation, then enter the coefficients, in order, in the answer…

Determine the number of atoms in 53.0 grams of bromine, Br. (The mass of one mole of bromine is 79.90 g.) atoms 1 3 6. C 7 8. 9. +/- х 100

The molar mass is the mass of 6.022 x 1023 particles of matter. O True False

Compare and contrast the following terms: “a mole” (as it is used in chemistry) and “a dozen” Give one main similarity and one main difference between the two concepts.