Which of the following is an example of how to supply activation energy to begin a reaction?a. Cool the reaction flask in an ice bath.
b. Add a catalyst.
c. Heat the reaction flask on a hot plate.
d. Add an inhibitor. '

Answers

Answer 1

Answer:

The event that is an example of how to supply activation energy to begin a reaction is adding a catalyst. The answer is letter B. Cooling the reaction flask in an ice bath, heating the reaction flask on a hot plate. And adding an inhibitor does not answer the question.

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Several steps are involved in the industrial production of sulfuric acid. One step involves the oxidation of sulfur dioxide gas to form sulfur trioxide gas. A catalyst is used to increase the rate of production of sulfur trioxide gas. In a rigid cylinder with a movable piston, this reaction reaches equilibrium, as represented by the equation below.2SO2(g) + O2(g) <==> 2SO3(g) + 392 kJ Explain, in terms of collision theory, why increasing the pressure of the gases in the cylinder increases the rate of the forward reaction. Determine the amount of heat released by the production of 1.0 mole of SO3(g). State, in terms of the concentration of SO3(g) , what occurs when more O2(g) is added to the reaction at equilibrium.
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8H2 + S8 8H2S Based on the mole ratios, what can most likely be predicted? A.1 mol of hydrogen will react with 1 mol of sulfur. B.8 mol of hydrogen will react with 1 mol of sulfur. C. 8 mol of hydrogen will react with 8 mol of sulfur. D.16 mol of hydrogen will react with 8 mol of sulfur.

In an experiment to test a new drug’s effectiveness, one group is given a larger dosage than is typically prescribed, and a second group is given a smaller dosage than is typically prescribed. Then, the results of the groups are compared to each other. What is missing that would improve this scientific design? control group

Answers

for the other group to pesxribe add another half to the bottle

Answer:

Need a control group.

Explanation: Without a control group you would not be able to interpret the results correctly.

Which type of stoichiometric calculation does not require the use of the molar mass?

Answers

The choices can be found elsewhere and as follows:

a. mass-mass problems
b. mass-volume problems
c. mass-particle problems
d. volume-volume problems

I believe the correct answer is option D. It is volume-volume problems that does not require the use of molar mass. Here you are dealing with molarities and volumes to determine concentrations. Molar mass is not part of any calculations.

Final answer:

The type of stoichiometric calculation that does not require the use of the molar mass is a calculation involving molar or stoichiometric ratios which are derived directly from the coefficients in a balanced chemical equation.

Explanation:

In stoichiometry, there are several types of calculations that can be performed. However, the type of stoichiometric calculation that does not require the use of the molar mass is the calculation involving the molar ratio, or stoichiometric ratio. This refers to the ratio of coefficients in a balanced chemical equation, which we use to determine the relative amounts of each substance involved in a chemical reaction.

An example of this is a balanced equation for the formation of water: H2 + 0.5O2 -> H2O. In this equation, the molar or stoichiometric ratio of hydrogen (H2) to oxygen (O2) to water (H2O) is 2:1:2. If we are given the number of moles of one substance, we can use this molar ratio to find the number of moles of any other substance in the equation, without needing to know their molar masses. This constitutes a stoichiometric calculation without the need for molar mass.

Learn more about Stoichiometric Calculations here:

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The three components essential for a fire are:a. Oxygen, fuel, ignition source.
b. Oxygen, fuel, primer.
c. Oxygen, fuel, oxygen enriched environment.
d. Oxygen, fuel, a liquid.

Answers

Hey there

The answer should be : Oxygen, fuel , heat

I hope that's help !

Fe(NO3)2 not sure how to get the oxidation numbers of all elements

Answers

You must remember that oxidation number of hydrogen in acids is always +1, oxidation number of oxygen in oxides & acids is always -2... metals has always oxidation number on plus!

group NO3 comes from HNO3...and oxidation number of whole acid group is always on minus and equal to the amount of hydrogen atoms in this acid... so oxidation number of NO3 = -1

we have 2 NO3 groups so 2*(-1) = -2 and that is the reason why oxidation number of Fe in this formula must be +2... because sum of all elements always gives 0!

Now we could count of oxidation number for nitrogen... we write HNO3 and start counting from right to left:
3*(-2) from oxygens + 1 from hydrogen = -5
so nitrogen must have +5 oxidation number... because sum all in formula must be 0.

If you eat foods that are compact and _______, more can fit into your stomach with less discomfort.A. dense
B. dry
C. puffed
D. tasty

Answers

The answer my friend is dense and here is why if you compact dense food it becomes even more flat and there is more room for food.

Answer:

A. dense

Explanation:

Which of the following is an example of a mixture? Option 1: Pure water Option 2: The air in your room Option 3: Gold Option 4: All of the above

Answers

Answer:

Explanation:

Pure water is not a mixture....it is only water

gold ...is only gold

2. air IS a mixture of various gases.....nitrogen , oxygen, co2 etc

Final answer:

Option 2: The air in your room. The air in your room is an example of a mixture because it consists of various gases that can be separated from each other.

Explanation:

The correct answer is Option 2: The air in your room.

A mixture is a combination of two or more substances that are not chemically bonded together. The air in your room is a mixture because it consists of various gases such as oxygen, nitrogen, carbon dioxide, and others. Each gas retains its individual properties and can be separated from the others.

On the other hand, pure water is a compound because it consists of two hydrogen atoms bonded to an oxygen atom, while gold is an element because it is composed of only gold atoms.