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Q 1/18
Score 0
Which statement correctly describes chemical compounds?
30
They are listed in the periodic table.
They may be formed in reactions involving large energy changes.
They are represented by their chemical symbols.
They are only formed from metals and non-metals.
Q 2/18
Score 0
Which of the following statements is correct?
30
The symbol for an oxygen atom is O2.
The symbol for copper is C.
The formula for a chlorine molecule is Cl.
There are over 100 symbols for elements.
18 questions
Q.
Which statement correctly describes chemical compounds?
1
30 sec
Q.
Which of the following statements is correct?
2
30 sec
Q.
Which of the following equations represents the balanced equation for the reaction between sodium and chlorine?
3
30 sec
Q.
In the apparatus shown on the information sheet, used to separate a mixture of liquids, which of the following is represented by label A?
4
30 sec
Q.
The process by which common salt is obtained from a hot, concentrated solution of it in water is called:
5
30 sec
Q.
Mixtures are commonly met in everyday life. Which of these statements is true about mixtures?
6
30 sec
Q.
As part of a class exercise about fractional distillation, a teacher gave her students a list of compounds and told them to find their boiling points on the Internet. She then told the students to record their boiling points in the most suitable way. What type of graph should the students plot?
7
30 sec
Q.
The diagram on the data sheet represents the so-called plum pudding model of the atom. Which of the following statements was believed to be true about this early model?
8
30 sec
Q.
Which of the following conclusions about atoms was drawn from the results of the alpha scattering experiment carried out by Rutherford?
9
30 sec
Q.
The electronic structure of an atom of an element is shown on the data sheet. In which group of the periodic table is the element found?
10
30 sec
Q.
Which of the following has an overall positive charge?
11
30 sec
Q.
Which of the following statements about atoms is correct? All the atoms of an element have the same number of:
12
30 sec
Q.
An atom of beryllium contains four protons, five neutrons and four electrons. Which of the answers on the answer sheet represents this atom of beryllium?
13
30 sec
Q.
Atoms are very small. The radius of an atom is 0.1 nm and the radius of the nucleus of an atom is about 1 × 10–14 m. Choose the option below to form a correct statement. The radius of the atom:
14
30 sec
Q.
What is the difference between different isotopes of an element?
15
30 sec
Q.
Chlorine is made up of two isotopes: 25% chlorine-35 and 75% chlorine 37. Which of the following calculations gives the relative atomic mass of chlorine?
16
30 sec
Q.
Which of the following statements is correct about the electronic structure of atoms? The number of electrons in the :
17
30 sec
Q.
Which of the following describes the positioning of elements in the modern periodic table? Elements are arranged in:
