Year 10 Chemistry Test: Practice Questions
Document Details
Uploaded by CxldMoney
10
Tags
Summary
This is a practice chemistry test designed for year 10 students. It covers topics such as atomic particles, valence electrons, ionic formulas, and balancing equations. The test includes multiple choice and written questions to assess understanding of fundamental chemistry concepts.
Full Transcript
Page 1 PRACTISE CHEMISTRY TEST YEAR 10 Name ___________________ Part 1 Multiple Choice Place a cross on the correct answer. Choose one only. 1. Which of the following statements regarding atomic...
Page 1 PRACTISE CHEMISTRY TEST YEAR 10 Name ___________________ Part 1 Multiple Choice Place a cross on the correct answer. Choose one only. 1. Which of the following statements regarding atomic particles is false? a) Protons are found in the nucleus and are positively charged particles. b) Electrons move around the nucleus and contribute little to the mass of the atom. c) Neutrons are found in the nucleus and they have no charge. d) The numbers of neutrons, protons and electrons are always equal in a neutral atom. 2. Which of the following elements has 4 valence electrons? a) Carbon b) Nitrogen c) Neon d) Sulfur 3. The number of valence electrons in an atom is equal to a) the number of electrons in the atom. b) the charge on a positive or negative ion formed by that atom. c) the number of electrons in the outer energy level of the atom. d) the number of electrons needed to fill all the energy levels of the atom. 4. The number of valence electrons in the Group 2 elements of the Periodic Table is a) 2 c) 4 Page 2 c) 6 d) 8 5. Which of the following species does NOT have a stable electron configuration (i.e. like those of an inert gas)? a) Cl+ b) K+ c) Al3+ d) Mg2+ 6. Which of the ionic formulas below is written incorrectly? a) Na2O b) NH4NO3 c) Fe2(SO4)3 d) AlOH3 7. The correct name of the molecular substance represented by the formula, N2O is a) nitrogen dioxide. b) nitrogen oxide. c) nitrogen monoxide. d) dinitrogen monoxide. 8. If an element has the electron configuration: 2, 8, 2 then it would most likely form an ion of charge a) +2 b) -2 c) +6 d) -6 9. Which line of the table below gives the correct information for carbon-14 Protons Neutrons electrons a) 6 6 6 b) 6 8 6 c) 6 8 8 d) 14 14 14 Page 3 Part 2 Written Answer all questions in the spaces provided – 1. Give the chemical formula for the following ionic substances - a. Copper II nitrate b. Silver chloride c. Sodium phosphate d. Aluminium carbonate e. Ammonium sulfate f. Zinc hydroxide g. Potassium sulfide (7 marks) 2. Complete the following table for names and formulas of molecular substances NAME FORMULA Nitrogen gas NO2 Sulfur trioxide CO Phosphorus trichloride Dihydrogen monoxide (6 marks) Page 4 3. Balance the following equations – a. N2 + H2 ïƒ NH3 b. NaOH + H2SO4 ïƒ Na2SO4 + H2O c. NH3 + O2 ïƒ NO2 + N2O (6 marks) 4. Give the electron configuration for the following – a. Sodium atom b. Chlorine atom c. Argon atom d. Potassium ion (4 marks) 5. Give two pieces of scientific evidence about the inert or noble gases that is explained by the filled outer energy level present in each element in this group. (2 marks) 6. Three white powders were dissolved in acid then placed into a hot flame. Two of the substances produced a blue flame, and the other a pale green flame. What conclusions can you make about the substances? (2 marks) Page 5 7. What is the difference between a covalent bond and an ionic bond? Use NaCl and Cl2 as examples to assist in your answer. (3 marks) 8. Sodium and potassium are both in Group I of the Periodic Table. Give two properties of these metals. (2 marks)
