Suppose that a student did not stop the timer as
soon as bubbling stopped during a test at 40°c.
check all possible resulting errors.
measurements at all temperatures will have
errors.
the reaction time will be too long.
the reaction time will be too short.
the reaction time will resemble the reaction
time for a higher temperature.
the reaction time will resemble the reaction
time for a lower temperature.

B and E

Explanation:

The reaction time will be too long.

The reaction time will resemble the reaction time for a lower temperature.

2 and 5

Explanation:

the answer to the second part is 1, 2, and 4

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.  

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