Alkali Metals Practice Questions PDF
Document Details
Uploaded by Meme
University of Doha for Science and Technology
Tags
Summary
This document contains questions and problems related to alkali metals, atomic structure, subatomic particles, isotopes, and states of matter. The questions cover various aspects of chemistry, including calculations and explanations.
Full Transcript
lkali metals practise questions A How do the group 1 metals react with water? lithium, sodium, pottassium all react strongly with water. What does the reaction produce? Hydrogen gas bubbles off a metal hydroxide is formed which is a strong AlKali Why are group 1 metals sto...
lkali metals practise questions A How do the group 1 metals react with water? lithium, sodium, pottassium all react strongly with water. What does the reaction produce? Hydrogen gas bubbles off a metal hydroxide is formed which is a strong AlKali Why are group 1 metals stored in oil? To prevent they from reacting with the oxygen and water vapour in the air. What happens to the reactivity as you go down the group? Group 1 metals increases down the group as there are more shells. Why are they called Alkali metals? because they form an Alkali Solution in water. Why do they get more reactive as they go downt group? The atoms become larger, and the outer electron is farther from the nucleus, this mak it easier for the outer electron to be lost. What reacts with the metal? Hydrogen Section 1: Atomic Structure and Subatomic Particles 1. Multiple Choice What are the three subatomic particles of an atom? a) Protons, neutrons, and electrons b) Electrons, photons, and neutrons c) Protons, electrons, and positrons d) Neutrons, protons, and neutrinos 2. Short Answer Where is the majority of an atom's mass located, and what subatomic particles contribute to this mass? 3. True or False Neutrons have a positive charge. (Circle one) ○ True ○ False 4. Short Answer What is the charge of a proton, and where is it found in the atom? Section 2: Isotopes and Atomic Mass 5. Multiple Choice Which of the following elements has isotopes? a) Helium (He) b) Carbon (C) c) Hydrogen (H) d) All of the above 6. Short Answer What is an isotope? Give an example of an element with isotopes and explain the difference between them. 7. Calculation A sample of carbon contains 98% carbon-12 (C-12) and 2% carbon-14 (C-14). The atomic mass of carbon-12 is 12 amu, and the atomic mass of carbon-14 is 14 amu. Calculate the average atomic mass of this sample of carbon. Section 3: States of Matter and Changes in State 8. Multiple Choice Which of the following describes the movement of particles in a solid? a) Particles move freely and spread out to fill the container. b) Particles vibrate in place, but do not move past each other. c) Particles move quickly and collide with each other. d) Particles move in a regular pattern, like in a liquid. 9. Short Answer Describe what happens to the arrangement and movement of particles when a substance changes from a solid to a liquid. 10. True or False In a liquid, the particles are spread far apart and move freely. (Circle one) ○ True ○ False Section 4: Atomic Mass and Molecular Mass 11. Calculation A molecule of water (H₂O) consists of 2 hydrogen atoms and 1 oxygen atom. The atomic mass of hydrogen is 1 amu, and the atomic mass of oxygen is 16 amu. What is the molecular mass of water (H₂O)? 12. Multiple Choice The atomic mass of an element is: a) The mass of a single atom of the element. b) The average mass of all naturally occurring isotopes of the element. c) The mass of a molecule made up of atoms of that element. d) The mass of one mole of the element. 13. Short Answer How would you calculate the relative atomic mass of an element if you are given the mass and percentage of its isotopes? Section 5: Atomic Number and Mass Number 14. Multiple Choice The atomic number of an element is equal to the number of: a) Protons only b) Neutrons only c) Electrons only d) Protons and neutrons 15. Short Answer An element has an atomic number of 8 and a mass number of 16. How many protons, neutrons, and electrons does an atom of this element have? Bonus Question (Optional) 16. Short Answer How does the presence of neutrons in an atom affect its stability? Explain with an example.
