Check out these 15 Elements and Compounds Trial Questions for BECE Candidates
This article contains Elements and Compounds Trial Questions with Answers. Get yourself run through these set of questions as you prepare to sit for your exams as a JHS student or BECE candidates.
These elements and Compounds trial questions are ideal for Basic 8 learners and those preparing to write their final exams. Solve them with your friends, individually if you have study groups do well to share with them.
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Below are the Elements and Compounds trial questions.
- Briefly explain the following; i. Elements ii. Compounds iii. Mixture
Elements are substances that are made of up pure substances which cannot be broken down by any known physical or chemical means
Compounds are formed when two or more elements are chemically combined
Mixture is the physical combination of two or more substances
- Explain why an atom is said to be electrically neutral
This is because the number of protons and the number of electrons are the same. Since protons have positive charge and electrons have negative, the two cancel out to give zero.
- An atom of chlorine has a mass number of 37 and atomic number of 17. Calculate the number of neutrons
Use the formula A = Z + N, where A represents mass number, Z represents atomic or proton number and N represents number of Neutrons. So put in the values in the equation
37= 17 + N, group like terms
N=37-17
N = 20
- State the three sub-atomic particles
Proton, neutrons and electrons
- Outline three particles of atom that have positive charges
Protons, alpha, cations
- How do negative ions formed? Briefly explain
Negative ions are formed by gaining electrons from other atoms.
- Identify the following elements i. Fe ii. K iii. Au iv. I
Fe= Iron K= Potassium Au= Gold I= Iodine
- Differentiate between cation and anion
Cations are the positive charges particles or positive ions whereas anions are the negative charge particles or negative ions
- What is an electronic configuration?
It is the arrangement of electrons on the shells of an atom
- Determine the electrical charges for the following i. Aluminium ion ii. Magnesium ion iii. Chloride
Aluminium ion = +3, Al3+
Magnesium ion = +2, Mg2+
Chloride = -1, Cl–
- Represent the atoms below on an atomic structure i. Neon ii. Sulphur iii. Oxygen
Draw this yourself, the first shell of an atom takes, 2 electrons, second takes 8 , third takes 8, since we are dealing with the first twenty elements the last shell will have 2 electrons.
Neon has 10 electrons, Sulphur has 16 electrons and Oxygen has 8 electrons
- Define valency and state the valencies for the atoms Iron and Zinc
Valency is defined as the combining power of an element
Iron (Fe) = 2 or 3
Zinc (Zn) = 2
- Complete the table below;
| Atom | Mass number | No. of neutrons | Atomic number |
| X | 16 | 8 | |
| Y | 20 | 17 | |
| Z | 23 | 12 |
- Fill in the spaces
- Determine the atoms X, Y, Z
Using the formula above, A = Z + N, solve for the empty spaces.
To know the names of the atom X, Y, Z, look at the number of protons and ask which element has that number.
- Give two examples each i. Mixture ii. Compounds
Mixture = Air, Crude oil, Sugar solution, sea water
Compounds = water, Ammonia, Sodium hydroxide, Carbon dioxide
- Write out the last three elements on the first elements
Argon, Potassium, Calcium
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