Chapter 19 Science quizalize

This law states the mass of reactants has to be equal to the mass of the products. 1) Law of Multiple Proportions 2) Law of Conservation of Mass 3) Law of Chemical Reactions 4) Law of Definite Proportions

2) Law of Conservation of Mass

Students measure 2 g of baking soda and 5 g of vinegar. they mix them together in a beaker and watch bubbles form. The results of the mass liquid is 6.7 g. Based on the Law of Conservation of Mass, what should the mass of the gas that escaped be? 1) .7 g 2) .3 g 3) .5 g 4) 6.7 g

.3 g

If the reactants on the left side of a chemical equation are C3H8 + 5O2, the products in a balanced equation could be 1) 3CO2 + 4H2O 2) 4CO2 + 3H2O 3) 3CO + 4H2O 4) 2CO2 + 3H2O

1) 3CO2 + 4H2O

Which of the following is NOT a chemical change? 1) Ice in a beaker over the Bunsen burner turns into water 2) Lighting a Bunsen Burner 3) Lighting a match 4) Adding pieces of calcium to the water in the beaker

1) Ice in a beaker over the Bunsen burner turns into water

Which of the following is a chemical change? 1) Letting the milk sit out overnight and waking up to find sour milk 2) Pouring a glass of milk 3) Adding chocolate syrup to the milk 4) Stirring the chocolate syrup into the milk

1) Letting the milk sit out overnight and waking up to find sour milk

In a chemical reaction, mass is conserved. This means that 1) The type and number of atoms in the reactants equals the type and number of atoms in the products 2) The mass of the products is always twice the mass of the reactants 3) The mass of the products stays the same during a chemical reaction 4) The mass of the reactants stays the same during a chemical reaction

1) The type and number of atoms in the reactants equals the type and number of atoms in the products

How does the number and kind of atoms involved as reactants in a chemical reaction compare to the number and kind of atoms in the products? 1) There are the same number and kind of each 2) There are more atoms that react 3) It varies from one reaction to another 4) There are more atoms that are produced

1) There are the same number and kind of each

If two substances react and the temperature of the mixture increases, the reaction is 1) exothermic 2) endothermic 3) one that needs a catalyst 4) Not one that produces anything new

1) exothermic? *heat energy is produced or given off from the two substances reacting

When an element is reduced, its atoms 1) gain electrons 2) lose protons 3) gain protons 4) lose electrons

1) gain electrons

What are the coeffecients that will balance this reaction? _________HCl(aq) + __________ Mg(OH)2(aq) >> _________H2O(l) + __________MgCl2(aq) 1) 2, 2, 1, 1 2) 2, 1, 2, 1 3) 1, 2, 2, 1 4) 2, 1, 1, 2

2) 2, 1, 2, 1

Which of the following is a chemical change? 1) Water freezes to form ice 2) Fireworks explode in a colorful display 3) Sawdust is produced from wood being cut by a power saw 4) Juice is obtained from an orange

2) Fireworks explode in a colorful display

If a reaction is endothermic, 1) The same amount of energy is used to break the bonds of the reactants as is released when the bonds in the products are formed 2) It takes more energy to break the bonds of the reactants than is released when the bonds in the products are formed 3) More energy is released when the bonds in the products are formed than is used to break the bonds in the reactants 4) The temperature increases.

2) It takes more energy to break the bonds of the reactants than is released when the bonds in the products are formed.

If a reaction is exothermic, 1) It take more energy to break the bonds of the reactants than is released when the bonds in the products are formed 2) More energy is released when the bonds in the products are formed than is used to break the bonds in the reactants 3) The temperature goes down 4) The same amount of energy is used to break the bonds of the reactants as is released when the bonds in the products are formed

2) More energy is released when the bonds in the products are formed than is used to break the bonds in the reactants

In the following single replacement reaction, what would be the second product formed? Na + LiCl2 >> Li + ______________ 1) LiCl 2) NaCl 3) Cl 4) not enough information to answer

2) NaCl

In a reaction with hydrochloric acid, powdered magnesium reacts faster than the same mass of magnesium ribbon. Why is this? 1) The powdered magnesium is hotter than the magnesium ribbon 2) The powdered magnesium has a bigger surface area than the magnesium ribbon 3) The powdered magnesium contains more atoms than the magnesium ribbon 4) The powdered magnesium had a catalyst added

2) The powdered magnesium has a bigger surface area than the magnesium ribbon

A student uses clay to model the conservation of mass. First, she finds the mass of a block of clay on a balance. Then she molds the clay into a different shape, without adding or removing clay. She masses it again. How will her results model this law? 1) They will show the changing shape has changed the mass of the clay. 2) They will show that the shape has changed, but the mass is the same. 3) They will show that the shape has changed and the mass has also. 4) They will show that the larger the shape, the greater the mass.

2) They will show that the shape has changed, but the mass is the same.

One clue of a chemical change is the formation of a precipitate. A precipitate is formed when: 1) One liquid dissolves in another 2) Two liquids react and a solid is formed 3) Two liquids react and a gas is produced 4) A solid dissolves in a liquid

2) Two liquids react and a solid is formed

What are the reactants in the following chemical equation: Zn + CuSO4 >> ZnSO4 + Cu 1) Zinc and Copper (I) sulfate 2) Zinc and copper (II) sulfate 3) Zinc Sulfate and Copper 4) Zinc and Copper

2) Zinc and Copper (II) Sulfate

In a ___________________ chemical reaction, the type and number of atoms are the same on both sides of a chemical equation. 1) reverse 2) balanced 3) endothermic 4) unbalanced

2) balanced

The Law of Conservation of Mass states that matter is not gained or lost in a chemical reaction. Which of the following correctly restates this law? In a chemical reaction 1) the amount of mass is equal to the sum of the reactants and products 2) the amount of mass of the reactants will equal the mass of the products 3) matter is gained and lost but energy is conserved 4) matter is gained and lost depending on how much energy is added

2) the amount of mass of the reactants will equal the mass of the products

In the chemical reaction CH4 + 2O2 >> CO2 + 2H2O. If you count the atoms in the reactants, there are 1) 4 carbon atoms, 4 hydrogen atoms, and 2 oxygen atoms 2) 1 carbon atom, 4 hydrogen atoms, and 2 oxygen atoms 3) 1 carbon atoms, 4 hydrogen atoms, and 4 oxygen atoms 4) 4 carbon atoms, 4 hydrogen atoms, and 4 oxygen atoms

3) 1 carbon atom, 4 hydrogen atoms, and 4 oxygen atoms

Balance the equation: ______CaCO3 + ________HCl >> _________CaCl2 + ______H2CO3 1) Equation is already balanced 2) 2, 2, >> 1, 1 3) 1, 2 >> 1, 1 4) 1, 2 >> 2, 1

3) 1, 2 >> 1, 1

A precipitate is: 1) A change in solution color during a chemical change 2) A rocky edge 3) A solid formed from a chemical reaction 4) A substance dissolved in a liquid

3) A solid formed from a chemical reaction

Consider the reaction represented by the chemical equation: AgNO3(aq) + NaCl(s) >> AgCl(s) + NaNO3(aq). What are the reactants? 1) AgCl(s) + NaNO3(aq) 2) NaCl(s) 3) AgNO3(aq) + NaCl(s) 4) AgNO3(aq)

3) AgNO3(aq) + NaCl(s)

Which product is missing from this single replacement reaction? Cu(s) + H2SO4(aq) >> CuSO4(aq) + ??? 1) O2(g) 2) CO2(g) 3) H2(g) 4) H(g)

3) H2

Chopping vegetables before cooking increases their reaction rate. The factor that helps with the increase in the reaction rate is ____________________. 1) Decreased surface area 2) Increased concentration of vegetables 3) Increased surface area 4) Increased temperature

3) Increased surface area

An equation is balanced by 1) adding elements as necessary 2) changing subscripts 3) adding coefficients 4) erasing elements as necessary

3) adding coefficients

A catalyst 1) is one of the "ingredients" in a chemical reaction 2) dissolves chemicals that water is unable to 3) speeds up a chemical reaction without actually combining with reactants 4) is a large molecule that is broken down by a smaller one

3) speeds up a chemical reaction without actually combining with reactants

Complete the following chemical reaction: zinc + copper chloride >> copper + ? 1) chloride 2) zinc 3) zinc chloride 4) copper zinc

3) zinc chloride

If four carbon atoms combine with oxygen to form carbon dioxide molecules, how many carbon atoms will be found in the product? 2 3 1 4

4

Marble reacts with hydrochloric acid to produce calcium chloride, water and carbon dioxide. In which of these mixtures is the rate of reaction likely to be the greatest? 1) 1 g of marble chips in 100cm3 of hydrochloric acid at 30 degrees celsius 2) 1 g of marble chips in 100cm3 of hydrochloric acid at 20 degrees celsius 3) 1 g of powdered marble in 100cm3 of hydrochloric acid at 20 degrees celsius 4) 1 g of powdered marble in 100cm3 of hydrochloric acid at 30 degrees celsius

4) 1 g of powdered marble in 100cm3 of hydrochloric acid at 30 degrees celsius

Balance the reaction: __________ C2H5OH + _________O2 >> ______CO2 + ______ H2O 1) 1, 2 >> 2, 3 2) 1, 3 >> 2, 2 3) 1, 3 >> 1, 3 4) 1, 3 >> 2, 3

4) 1, 3 >> 2, 3

A chemical change is different than a physical change because in a chemical change 1) Molecules do not physically touch 2) The change can be seen but in a physical change it cannot 3) chemicals are used 4) A new substance is formed and in a physical change, no new substance is formed

4) A new substance is formed and in a physical change, no new substance is formed

Consider the reaction represented by the chemical equation: AgNO3(aq) + NaCl(s) >> AgCl(s) + NaNO3(aq). What are the products? 1) NaNO3(aq) 2) AgCl(s) 3) AgNO3(aq) + NaCl(s) 4) AgCl(s) + NaNO3(aq)

4) AgCl(s) + NaNO3(aq)

What has happened to the atoms of the reactants? 1) They have changed into new atoms 2) They have new names and places 3) Some have been lost to the environments 4) They have recombined to form the products

4) They have recombined to form the products

During a chemical reaction, 1) new elements are produced 2) elements are destroyed 3) atoms are destroyed 4) atoms are rearranged

4) atoms are rearranged

Vinegar is added to baking soda and bubbles of carbon dioxide rapidly form. A cloudy liquid is left behind. What are the products in this chemical reaction? 1) carbon dioxide and baking soda 2) vinegar and the cloudy liquid 3) vinegar and the baking soda 4) carbon dioxide and the cloudy liquid

4) carbon dioxide and the cloudy liquid

In the chemical reaction: iron + sulfur >> iron sulfide 1) sulfide is the product 2) iron, sulfur and iron sulfide are products 3) iron and sulfur are products 4) iron sulfide is the product

4) iron sulfide is the product

In a chemical reaction 1) Some atoms disappear while others multiply to form the products 2) new atoms are formed which combined to make the products 3) The atoms of the reactants always stay together to form the products 4) The atoms of the reactants unbond, rearrange, and then rebond to form the products

4) the atoms of the reactants unbond, rearrange, and then rebond to form the products

Some chemical reactions require a substance called a catalyst. The main purpose of a catalyst is 1) to warm up the reaction therefore making it go faster 2) to stop the reaction 3) to create more reactants 4) to speed up the reaction by lowering the amount of energy needed to start the reaction

4) to speed up the reaction by lowering the amount of energy needed to start the reaction

Which is the "x" in the following equation? C5H12 + xO2 >> 5CO2 + 6H2O 8 2 10 4

8

A chemical reaction may be sped up by 1) Heating the reactants 2) Using more finely ground reactants 3) Using more concentrated reactants 4) All of the above

All of the above

Balance the equation: ______Zn + _______ H2SO4 >> _______ZnSO4 + ______H2 1) 1, 1 >> 1, 2 2) Equation already balanced 3) 2, 1 >> 1, 1 4) 1, 2 >> 1, 2

Already balanced

The following is an example of which reaction? CH4 + O2(g) >>> CO2(g) + H2O (g) Single Replacement Double Replacement Combustion Decomposition

Combustion

The following is an example of which reaction? MgBr2(aq) + NaCl(aq) >> MgCl2(aq) + NaBr(aq) Decomposition Synthesis Double Replacement Single Replacement

Double Replacement

A catalyst slows down the rate of reaction to make better products. True or False

False

In a chemical reaction, only the atoms present in the ________________ can end up in the products. Reactants Ingredients Products

Reactants

The following is an example of which reaction? NH3(l) + H2O(l) >> NH4OH(aq) Single Replacement Decomposition Double Replacement Synthesis

Synthesis

A catalyst does not actually become part of the products of a chemical reaction. True or False

True

In a chemical reaction, no new atoms are created, and no atoms are destroyed. True or False

True

A chemical reaction is a process in which 1) law of conservation of mass applies 2) reactants change into >> products 3) a new substance is created 4) all of these are correct

all of the above

The following is an example of what type of reaction? Lead nitrate reacts with potassium iodide to form lead iodide and potassium nitrate. 1) synthesis 2) double replacement 3) single replacement 4) decomposition

double replacement

If two substances react and the temperature of the mixture decreases, the reaction is 1) Exothermic 2) Endothermic 3) one that causes atoms to be destroyed 4) never going to happen unless it is heated

endothermic?

In a chemical reaction, if the reactants are heated, the reaction usually happens faster slower at the same rate

faster

Consider the reaction represented by the chemical equation: NO3(aq) + NaCl(s) >> NO3Cl(aq) + Na(s). What type of chemical reaction is this? 1) decomposition 2) synthesis 3) double replacement 4) single replacement

single replacement