In Figure 8, the letters A, E, G, J and Z show the positions of six elements in the periodic table - Edexcel - GCSE Chemistry - Question 8 - 2019 - Paper 1
Question 8
In Figure 8, the letters A, E, G, J and Z show the positions of six elements in the periodic table. These letters are not the symbols of the atoms of these elements.... show full transcript
Worked Solution & Example Answer:In Figure 8, the letters A, E, G, J and Z show the positions of six elements in the periodic table - Edexcel - GCSE Chemistry - Question 8 - 2019 - Paper 1
Step 1
Using the letters A, E, G, J and Z
(i) give the letters of the two elements that are non-metals.
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Answer
The two elements that are non-metals are E and J.
Step 2
Using the letters A, E, G, J and Z
(ii) give the letters of two elements in period 2.
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Answer
The two elements in period 2 are A and E.
Step 3
Using the letters A, E, G, J and Z
(iii) give the letter of an element that normally forms an ion with a charge of +1.
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Answer
The element that normally forms an ion with a charge of +1 is J.
Step 4
All atoms of element E in this sample contain
(iv) 5 protons, 5 neutrons, 6 protons, 6 neutrons.
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Answer
The correct answer is A: 5 protons. Element E contains a total of 5 protons.
Step 5
Element X has an atomic number of 18.
State the electronic configuration of an atom of element X.
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Answer
The electronic configuration of element X (atomic number 18) is 2.8.8.
Step 6
In an experiment, 3.5 g of element A reacted with 4.0g of element G to form a compound.
Calculate the empirical formula of this compound.
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Answer
To find the empirical formula, we first need to calculate the number of moles of each element:
Moles of A:
Moles of A=7 g/mol3.5 g=0.5 mol
Moles of G:
Moles of G=16 g/mol4.0 g=0.25 mol
Calculate the ratio:
A:G=0.5:0.25=2:1
Thus, the empirical formula of the compound is (A_2G).
Step 7
An oxygen atom has six electrons in its outer shell.
A hydrogen atom has one electron in its outer shell.
Complete the dot and cross diagram of a molecule of water, H2O.
Show outer shell electrons only.
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Answer
The dot and cross diagram of a water molecule (H₂O) is represented as follows:
H H
\ /
O
In this diagram, the 'H' represents hydrogen atoms with one dot each for their outer shell electron, while 'O' represents oxygen with six total electrons, showcasing the shared pairs of electrons.
