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Chemistry Unit Test

QuestionAnswer
A water molecule (H20) is an example of a covalent bond because _________. Electrons are shared between the hydrogen and oxygen.
Ionic bonds for between what types of elements? Metals and Nonmetals
Covalent bonds form between what types of elements? Nonmetals and Nonmetals
How many atoms are in NH3? (Know how to calculate this... don't expect the same molecule on the test.) 4 (There is 1 nitrogen and 3 hydrogen atoms)
Look at your "mouse periodic table..." (you will be allowed to use this on the test as well) Which of the below elements will most likely form a covalent bond? a) K and Na b) Na and Cl c) H and O c) Hydrogen and oxygen because they are both nonmetals.
Look at your "mouse periodic table..." (you will be allowed to use this on the test as well) Which of the below elements will most likely form an ionic bond? a) Na and Cl b) H2O c) CH4 a) Sodium (Na) and Chlorine (Cl) (They form an ionic bond because 1 is a metal, and the other is a nonmetal.)
An atom that has a charge because it has gained or lost an electron is called a(n) ________? ion
What is matter? Everything around us is matter. Matter is anything that has mass and occupies space. There are 3 different states of matter - solid, liquid, and gas. Matter is made up of many atoms.
What is an atom? All matter is made up of atoms, which are made of protons, neutrons, and electrons. Atoms cannot be created nor destroyed, but can be rearranged.
What is a molecule? A molecule is 2 or more atoms bonded together. Molecules come in many shapes and sizes.
What is a covalent bond between atoms? In a covalent bond, the atoms are joined together by shared electrons.
What is mass? Mass is the amount of matter in an object. (Even though it is usually measured in grams (g) or kilograms (kg), it is NOT the same as weight because weight depends on gravity - you'd weigh less on the moon, BUT you'd have the same mass.)
Can you create H2O, CH4, and NH3 molecules just like the molecule worksheets? I emailed a key to 2 of these to co-teachers on October 3rd. At least one of these will be on the test. You'll need to use your element cards, so don't forget to bring them! Hopefully the answer is yes, but if not... practice and study those keys. :-)
Science is a _______________________ way to study the world in which we live. systematic
Science as ideas is called ______________________. philosophy
Science as observation includes the various scientific ___________________, such as chemistry and biology. disciplines
Science as invention is called __________________________. technology
Step 1 of the scientific method making observations
Step 2 of the scientific method forming a hypothesis
Step 3 of the scientific method perform experiment
Step 4 of the scientific method collect results
Step 5 of the scientific method draw conclusions
Interpreting scientific _____________ is an important part of scientific investigation, and can be the cause of many arguments. data
Chemistry is the study of the ______________ that makes up the physical world. matter
By doing quality ________________________, early scientists were able to show that the basic unit of matter is the _____________. atom
All things, both living and nonliving, are made of atoms, which are also called _________________. elements
Atoms are made of ____________________, __________________, and ____________________. protons, neutrons, and electrons
In a neutral atom, the number of _________________ equals the number of electrons. protons
To find the number of ________________, round the atomic weight to the nearest whole number, and subtract the number of protons (atomic number) neutrons
All elements are found in the _________________ __________________. periodic table
The central core of an atom is called the ___________________. nucleus
The _________________________ ________________________ are the ______________________ in the outer shell that can participate in forming chemical bonds with other atoms. valence electrons, electrons
Created by: jgordon.lpa