Untitled Quiz

Science is the well-tested knowledge based on observations and experiments.

Chemistry is the branch of science concerned with the substances of which matter is composed, the investigation of their properties and reactions, and the use of such reactions to form new substances.

True

<p>Noble gases can exist independently. Examples include Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), and Radon (Rn).</p> Signup and view all the answers

<p>Proton</p> Signup and view all the answers

<p>Protons are located in the nucleus of an atom.</p> Signup and view all the answers

<p>Protons have a positive charge of +1.</p> Signup and view all the answers

<p>True</p> Signup and view all the answers

<p>True</p> Signup and view all the answers

<p>A molecule is the smallest particle of matter that can exist independently. It is formed by the combination of two or more atoms held together by chemical bonds.</p> Signup and view all the answers

<p>Monatomic molecules are molecules made up of only one atom.</p> Signup and view all the answers

<p>Matter is anything that has mass and occupies space.</p> Signup and view all the answers

<p>A substance is a pure matter with a uniform composition, while a mixture is a combination of two or more substances that are not chemically combined.</p> Signup and view all the answers

<p>The two main components of substances are elements and compounds.</p> Signup and view all the answers

<p>An element is a substance that is formed of atoms having the same atomic numbers.</p> Signup and view all the answers

<p>There are approximately 118 elements known so far.</p> Signup and view all the answers

<p>False</p> Signup and view all the answers

<p>A pure substance formed by the chemical combination of two or more elements in a fixed ratio by weight.</p> Signup and view all the answers

<p>A homogeneous mixture is one in which the components are uniformly distributed and have a uniform composition throughout its mass.</p> Signup and view all the answers

<p>The atomic number of an atom is the number of protons present in its nucleus.</p> Signup and view all the answers

<p>The mass number of an atom is the total number of protons and neutrons present in its nucleus.</p> Signup and view all the answers

<p>True</p> Signup and view all the answers

<p>Isotopes are atoms of the same element that have the same atomic number (number of protons) but different mass numbers (number of protons and neutrons).</p> Signup and view all the answers

<p>The atomic number of Helium is 2.</p> Signup and view all the answers

<p>The mass number of Carbon is 12.</p> Signup and view all the answers

<p>The atomic mass of an element is the average weight of the atoms of that element, calculated based on the relative abundance of its different isotopes.</p> Signup and view all the answers

<p>A chemical symbol is a shorthand representation of an element, using one or two letters.</p> Signup and view all the answers

<p>A chemical formula indicates the number and types of atoms present in a compound.</p> Signup and view all the answers

<p>The three main types of chemical formulas include molecular formulas, empirical formulas, and structural formulas.</p> Signup and view all the answers

<p>A molecular formula gives the actual number of atoms of each element in a molecule. An empirical formula gives the simplest whole number ratio of atoms in a compound.</p> Signup and view all the answers

<p>A structural formula shows the arrangement and bonding of atoms in a molecule.</p> Signup and view all the answers

<p>The valency of an element is determined by the number of electrons present in its outermost shell.</p> Signup and view all the answers

<p>A periodic table is a tabular arrangement of all the chemical elements, organized based on their atomic numbers and recurring chemical properties.</p> Signup and view all the answers

<p>The periodic law states that the properties of elements are periodic functions of their atomic numbers.</p> Signup and view all the answers

<p>The horizontal rows in the periodic table are called periods.</p> Signup and view all the answers

<p>The vertical columns in the periodic table are called groups.</p> Signup and view all the answers

<p>The main groups of elements in the periodic table based on their electronic configurations are s-block, p-block, d-block, and f-block elements.</p> Signup and view all the answers

<p>Isotopes have various applications, including medical diagnosis, treatment, and research.</p> Signup and view all the answers

<p>Mass is the amount of matter in an object, while weight is the force of gravity acting on an object's mass.</p> Signup and view all the answers