Vocabulary
A solid with a regular, repeating arrangement of geometric shapes is called
crystal
What occurs when a substance melts, boils, or dissolves we call it a
physical change
What pH is neutral?
7
Name two positives of plastic
lightweight, long-lasting, hard to break, easy to form into different shapes, inexpensive to make, can be recycled
Electrons are shared in which type of bonding
covalent
A pure chemical substance with two or more repeating elements combined is called
compound
What we all the chemicals or ingredients that are being combined in a chemical reaction
reactant
acid
Name two negatives of plastic
don’t break down easily in landfill, produce toxic fumes if burned
Electrons are lost in what kind of bonding
ionic
Molecules that are arranges in long chains of many repeating small molecules over and over
polymers
The type of chemical reaction during which heat energy is released.
exothermic reaction
Give a reason recycling is important
Recycling is important to help cut down amount of trash dumped in landfills, and allows unwanted items to be used again.
Where aren protons and neutrons found?
nucleus
Name the type of reaction that occurs when two or more chemical substances interact with each other and change into a different chemical substance
chemical reaction
The type of chemical reaction during which heat energy is absorbed.
endothermic reaction
How would we classify vinegar, lemon juice, stomach juices, or a car battery liquid?
acids
Give three (3) examples of common crystals you would find around your home or outside.
salt, sugar, ice (water), rocks, iron sulfide.
Electrons in the outer energy level are called
valence electrons
The type of reaction that produces a physical change that does not change the chemical substance, but instead only changes the appearance of it
physical reaction
a substance that speeds up a chemical reaction without being used up in the process is called
catalyst
Substance that tastes chalky or bitter, has a slippery feel when it is wet, and is often used in household cleaning products.
base
valuable gemstones that are formed when graphite is placed under heat and pressure is called
diamond
What is the freezing point of water?