4.16 Chemical Reactions UT

According to the Law of Conservation of Matter, if 88 g of carbon dioxide (CO2) is produced in a reaction between oxygen (O) and 24 g of carbon (C), what is the mass of dioxygen (O2) in the reactants? A. 104 g B. 64 g C. 32 g D. 24 g

The correct choice is... B. 64 g

Which statement comparing ionic and covalent bonds is correct? A. Elements in Group IA are more likely to form covalent bonds than ionic bonds with other atoms. B. Covalent bonds tend to be less polar than ionic bonds. C. The difference between electronegativities for atoms in covalent bonds than for atoms in ionic bonds. D. More electrons are transferred to form covalent bonds than ionic bonds.

The correct choice is... B. Covalent bonds tend to be less polar than ionic bonds.

Which phrase describes an oxidizing agent? A. a substance that provides electrons to other substances B. a substance that gains an electron in a reaction C. a substance that reacts with oxygen D. a substance that provides oxygen in a reaction

The correct choice is... B. a substance that gains an electron in a reaction

How many atoms of carbon (C) are present in the reactants of the following chemical equation? C7H16 + O2 -> CO2 + H2O A. 23 atoms B. 1 atom C. 7 atoms D. 16 atoms

The correct choice is... C. 7 atoms

Use the reaction to complete the sentence. 2CO + O2 -> 2CO2 Carbon monoxide and oxygen combine to produce carbon dioxide. The total bond energy of the products is 1,472 kJ. The bond energy of each carbon-oxygen double bond in carbon dioxide is _____. A. 1,472 kj B. 2,944 kj C. 736 kj D. 368 kj

The correct choice is... C. 736 kj

Which event is an example of an exothermic reaction? A. melting ice B. decomposition C. combustion D. evaporation

The correct choice is... C. combustion

Cooking an egg is one type of process, while the formation of snow is another. In three to five sentences, identify each as exothermic or endothermic and explain how you know.

For this, simply do just that; identify both scenarios as either endothermic or exothermic and explain your reasoning. Remember, endothermic 'absorbs' meanwhile exothermic 'releases'.

Methane (CH4) is a gas that is found in small quantities in Earth's atmosphere. Which type of bonds does methane have, and why does one carbon atom bond with four hydrogen atoms? In three to five sentences, explain your answer in terms of valence electrons and electronegativity.

For this, you are basically discussing methane in a short 3-5 sentence essay. Pin-point the different bonds methane has, and explain why one carbon atom bonds with four hydrogen atoms. Keep in mind you are going to answer "in terms of valence electrons and electronegativity". Feel free to use your notes regarding the lesson if needed, unless your teacher/guidelines say otherwise.

According to the Law of Conservation of Matter, what happens to atoms during a chemical reaction? A. The atoms are rearranged to form new substances. B. Atoms are converted into energy during the chemical reaction. C. Nothing; they stay the same. D. More atoms are produced to form new substances.

The correct choice is... A. The atoms are rearranged to form new substances.

Use the table to answer the question. Graph represents the reaction CH4 + 4CI2 -> CCI4 + 4HCI Which statement about the change in bond energy of this reaction is correct? A. The reaction is exothermic because the total bond energy of the reactants is less than the total bond energy of the products. B. The reaction is endothermic because the energy of each bond in the reactants is less than the energy of a bond in the products. C. The reaction is endothermic because the total bond energy of the reactants is greater than the total bond energy of the products. D. The reaction is exothermic because the energy of each bond in the reactants is greater than the energy of a bond in the products

The correct choice is... A. The reaction is exothermic because the total bond energy of the reactants is less than the total bond energy of the products.

Acid-base reactions can also be classified as which type of reaction? A. double replacement B. synthesis C. single replacement D. decomposition

The correct choice is... A. double replacement

The left side of a chemical reaction is shown. Cu + AgNO3 -> Which type of reaction will the reactants undergo? A. synthesis B. single displacement C. decomposition D. double displacement

The correct choice is... B) single displacement

Aluminum oxide, Al2O3, decomposes into aluminum, Al, and oxygen gas, O2. Which ratio of aluminum to oxygen gas in the products of the reaction? A. 2 : 3 B. 4 : 3 C. 3 : 2 D. 1 : 3

The correct choice is... B. 4 : 3

Which statement correctly compares synthesis and decomposition reactions? A. Synthesis and decomposition reactions are both neutralization reactions. Synthesis reactions are in the form AB -> A + B, while decomposition reactions are in the form A + B -> AB. B. Synthesis and decomposition reactions are both neutralization reactions. Synthesis reactions are in the form A + B -> AB, while decomposition reactions are in the form AB -> A + B. C. Synthesis and decomposition reactions are opposites to each other. Synthesis reactions are in the form AB -> A + B, while decomposition reactions are in the form A + B -> AB. D. Synthesis and decomposition reactions are opposites to each other. Synthesis reactions are in the form A + B -> AB, while decomposition reactions are in the form AB -> A + B.

The correct choice is... D. Synthesis and decomposition reactions are opposites to each other. Synthesis reactions are in the form A + B -> AB, while decomposition reactions are in the form AB -> A + B.

Use the equation to answer the question. CH4 + 2O2 -> CO2 + 2H2O If you change the 2 in front of 2O2 to a 3, what will be the change in the results on the right side of the equation? A. There are now 3H2O molecules. B. Nothing changes in the equation. C. There are now 3CO2 molecules. D. There is an extra O2 molecule left over.

The correct choice is... D. There is an extra O2 molecule left over.

Which of the following equations shows a chemical change? A. NH3(g) ->NH3(l) B. H2O(s) -> H2O(g) C. C3H8 + 5O2 -> 3CO2 + 4H2O D. C2H5OH(l) -> C2H5OH(g)

The correct choice is.... C. C3H8 + 5O2 -> 3CO2 + 4H2O

When magnesium hydroxide reacts with nitric acid, it produces magnesium nitrate and water. Mg(OH)2 + 2HNO3 -> Mg(NO3)2 + 2H2O In one to two sentences, explain how this reaction demonstrates that matter is neither created nor destroyed in a chemical reaction.

Your turn; discuss the Law of Conservation of Matter rule and explain how the given reaction applies to the rule. It is a short answer essay that is only 1-2 complete sentences long. Remember, stay on track with the topic. And don't worry; if you have to look back in the lesson or back at your notes, you are free to do so unless the assignment guidelines or teacher says otherwise.

In three to five sentences, predict the bonding activity between phosphorous and chlorine. Why do you think they would bond that way?

Your turn; this is a short answer essay. Really, all it is asking you to do is predict how the combination of the two elements will react and give your reasoning. Remember, it doesn't have to be to elaborate, just 3-5 complete sentences that stays on topic and follows the guidelines to what the question is asking.