Chemical Equations When a chemical reaction occurs, atoms rearrange to form new

Question

Chemical Equations When a chemical reaction occurs, atoms rearrange to form new 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 ofeach kind of atom are the same on both sides of the of 1 Part A davender spheres thrlementBun Spheres Write hel he figure (Figure 1) shows the reaction of element and B for this reac1 ed chemical equa on answer as a chemical e Submi Hints MLAnswer Give Up Review Part Incorrect Try Again 4 attempts remaining Enter your answer such that the coeffcients in the chemical equation are expressed in the smallest whole numbe Balancing equations with polyatomic ions When balancing chemical equations with polyatomic ions, it may help to balance the ion as a whole, For example, the i PO. can be treated as a unit and balanced in both the reactants and the product, or you can break it down and bala each atom separatly

Explanation / Answer

Part A

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

2A + 3B2 -> 2AB3---------ANSWER

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Part C

You carefully weigh out 10.00g of CaCO3 powder and add it to 40.50g of HCl solution. You notice bubbles as a reaction takes place. You then weigh the resulting solution and find that it has a mass of 46.40g. The relevant equation is

CaCO3+2HCl-->H2O+CO2+CaCl2

What mass of CO2 was produced in this reaction?

caco3 molar mass = 100.0869 g/mol=100.1 g/mole

Number moles of CaCO3 = 10.00 g / (100.1 g/mole) = 0.100 moles CaCO3

Mass CO2 = moles CO2 * MW CO2 = moles CaCO3 * MW CO2 = 0.100 moles * 44.01 g/mole

= 4.40 grams CO2 -answer

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