Chemistry, 07.11.2019 21:31 chiefkeef5330

Which of the following is an example of a velocity?

284 cm/sec southwest

65 miles per hour

24.5 m/sec2

15 miles in 2 hours

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Answer from: mervindavisk

65 miles per hour

Explanation:

Concept being tested: Velocity

We need to know what is velocity;

Velocity is the rate of change in displacement.

How is it calculated?

Velocity is calculated by dividing displacement by time taken.Velocity = Displacement ÷ time taken

What constitutes velocity?

Displacement is the distance covered by a moving body on a specific direction. It is measured in km, miles, meters, etc.Time on the other hand is measured in seconds, mins, hours, etc.

What are some of the units for measuring velocity?

Velocity can, therefore, be measured in km/hr, m/sec. miles/hour, etc

Answer to our question:

Thus, in this case, the most appropriate example of velocity is 65 miles per hour.It means after every 1 hour a displacement of 65 miles is covered.

Answer from: Quest

answer: the enthalpy of the overall chemical reaction is +87.88 kj or +88 kj.

according to hess's law, the overall enthalpy of a reaction is the difference between the sum of enthalpy values of all the products and the sum of enthalpy values of all the reactants.

δh(reaction) = ∑nδh(products) - ∑nδh(reactants)

δh(reaction) = [δh $pcl_{3}$ +δh $cl_{2}$ ] - [δh $pcl_{5}$ ]

δh(reaction) = [1(-287.02) + 1(0) ] - [1(-374.9)] kj = +87.88 kj

here, δh (pcl3) = -287.02 kj, δh(cl2) = 0, δh(pcl5) = -374.9 kj

therefore, enthalpy of the overall reaction is +87.88 kj or +88 kj.

Answer from: Quest

the balanced equation for reaction of ca metal with o2 to produce cao is as below

2 ca+ o2→ 2 cao2

explanation

the reaction is balanced since the number of atoms in reactant side is equal to number of atoms in product side. for example they are 2 atom of ca in reactant side and 2 atoms of ca in the product side.

the process is a meet the requirement of redox reaction because : calcium is oxidized from oxidation state 0 to 2+ while oxygen is reduced from oxidation state 0 to 2-

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Which of the following is an example of a velocity?

284 cm/sec southwest

65...

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