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sweet-ann [11.9K]
4 years ago
15

Pamela wants to learn more about the career preferences of students in her school. She interviews a number of students from the

advanced science classes. Why is this sample likely to be biased? Advanced science students may not have clear career preferences. The numbers of boys and girls in the advanced science classes are not equal. Advanced science students are not representative of all the students in the school. It is too early for students to have career preferences while still in school. NextReset
Chemistry
1 answer:
Viktor [21]4 years ago
4 0
It is too early for students to have career preferences while still in school

(i believe) <span />
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Anastasy [175]
These types of reactions are called endothermic reactions. This is when the system absorbs the heat from the surrounding. In this case, the system is the chemical reaction and the environment is the direct vicinity of the chemical reaction. You notice that the pack becomes cold because heat from the surrounding is being absorb. 

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6 0
4 years ago
Which should give the least vigorous reaction when dropped in water?
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Which should give the least vigorous reaction when dropped in water?

H2SO4 - sulpfhuric acid
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3 years ago
Compare 1 mole of H2, 1 mole of O2 and 1 mole of F2
likoan [24]

Explanation:

(a)  As per the mole concept, one mole of any atom contains 6.022 \times 10^{23} atoms or molecules, that is, Avogadro's number of atoms.

Therefore, 1 mole of H_{2} = 2 \times 6.022 \times 10^{23} molecules

                                           = 1.2044 \times 10^{23} molecules

   1 mole of O_{2} = 2 \times 6.022 \times 10^{23} molecules

                                    = 1.2044 \times 10^{23} molecules

   1 mole of F_{2} = 2 \times 6.022 \times 10^{23} molecules

                                    = 1.2044 \times 10^{23} molecules

Hence, there are equal number of molecules present in the given atoms.

(b)   Mass of each given atom will be calculated as follows.

                Mass = no. of moles × molar mass

As one molecule of H_{2} contains 2 atoms of hydrogen.

So, mass of 1 mole of H_{2} = 2 mol \times 1.008 g/mol

                                                     = 2.016 g

      mass of 1 mole of O_{2} = 2 mol \times 15.999 g/mol

                                                     = 31.996 g

      mass of 1 mole of F_{2} = 2 mol \times 18.998 g/mol

                                                     = 37.996 g

Thus, we can conclude that F_{2} has the greatest mass.

8 0
4 years ago
Qual substância apresenta 2 (dois) pares de elétrons sendo compartilhados entre seus átomos na
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Answer:

Explanation:

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3 0
3 years ago
_______ and _______ are located in the nucleus of the atom, while _______ exist in orbitals in the empty space outside of the nu
hram777 [196]

The atomic structure of an atom is well explained experimentally by different experiments like Rutherford's experiment etc

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There is empty space around the nucleus in which negatively charged subatomic particles are found known as electrons.

So answers are

a) protons

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6 0
4 years ago
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