Chemistry
is the type of change that happens when chemical bonds break and new bonds form
what is a chemical change?
A chemical reaction that releases heat is known as this
what is an exothermic reaction?
A chemical reaction that absorbs (or takes in) energy is called what?
Endothermic
Element group that are shiny, malleable, ductile, and good conductirs
what are the metals?
is the element that comprises most of the mass of the sun
what is hydrogen?
a decomposing or rotting fruit is an example of what type of change
what is chemical change?
Producing sawdust from the sawing of firewood is an example of a ______ change?
Physical Change
If an atom looses an electron, it becomes a ________ ion.
Positive
This atomic particle has a neutral charge or a charge of zero.
Neutrons
Earth's atmosphere is comprised of around 78% of this element.
Nitrogen
When a liquid changed to a gas, the particle movement _________
Increases
Carbon Dioxide gas being produced from mixing vinegar and baking soda is a ________ change?
Chemical Change
If an atom gains an electron, it becomes a _______ ion.
Negative
is the most abundant metalloid in Earth's crust
what is silicon?
A substance made up of only one type of atom is called this
Element
the substances listed on the left side of a chemical equation
what are the reactants?
The chemical reaction between sodium (Na) and Chlorine (Cl) forms this.
Daily Double! Name at least two ways that a chemical reaction can be identified.
Gas formed, solid formed, color change, odor change, energy change.
Is this equation balanced?
Zn + 2HCl ------> 2ZnCl2 + 2H
NO!
A combination of two or more substances that are not chemically bonded together and can be separated by physical means is known as?
A Mixture
Which law states: matter is not created or destroyed
what is the law of conservation of mass?
An elements position in the periodic table is determined by this.
The atomic number or the number or protons in the nucleus
What two quantities do you need to know in order to calculate the density of a substance?
Its Mass and Volume
An element's position in the periodic table is based on this
what are the number of protons in the nucleus?
Copper sulfate and calcium carbonate are examples of this
Compounds