Select the correct answer. A bicycle traveled 150 meters west from point A to point B. Then it took the same route and came back to point A. It took a total of 2 minutes for
the bicycle to return to point A. What is the average speed and average velocity of the bicycle?
ОА.
The average speed is 2.5 meters/second, and the average velocity is
2.5 meters/second east.
OB
The average speed is O meters/second, and the average velocity is
2.5 meters/second east.
Ос.
The average speed and average velocity are both O meters/second.
OD. The average speed is 2.5 meters/second, and the average velocity is
O meters/second.

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.

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answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol