Periodic Table
Fe is found on the periodic table and is the chemical symbol that stands for Iron. Iron is an example of this.
What is an Element.
When proteins such as eggs and meat are cooked we observe a change in the physical properties of color and firmness. Those observations are evidence of this.
What is a chemical change, chemical reaction. Heat energy breaks chemical bonds in proteins. Easier to digest- fuels brain growth.
For a chemical equation to accurately depict a chemical reaction this must be true.
The total mass of each type of atom in both the reactants and the products are equal to one another.
A salad is an example of this because the ingredients are not mixed absolutely evenly.
What is a heterogenous mixture. components not in a uniform ratio throughout the sample.
An chemist can find an element most similar to another by simply doing this.
Looking for the element directly above or below the element in question. The elements are group up and down by similar properties.
Mixing two chemicals together and having the result that there is less mass in your product as in your reactants is always evidence of this.
A gas formed and escaped into the surroundings.
H2 + O2 -----> H2O
True of false. This is equation supports the law of the conservation of mass.
False. There are 2 O in the reactants and one 1 O in the products.
Coffee is a good example of this because it's ingredients are mixed absolutely evenly.
What is a homogenous mixture. components in a uniform ratio through out the sample.
This is the order the categories of elements are in on the periodic table form Left to Right.
highly reactive metals, relatively nonreactive metals, metalloids, reactive nonmetals, nonreactive gases.
Highly reactive to Not reactive Left to right
Metal to Non Metal Left to right
This is the most reactive element on the periodic table.
What is H. Hydrogen
2H2 + O2 -------> 2H2O
True of false. this equation supports the law of conservation of mass.
True. In both the reactants and products there are 4, H atoms and 2, O atoms.
Sugar is an example of this because it is made of more than one type of atom. C6H12O6
What is a Compound
The elements on the Periodic table are arranged left to right according to this.
What is reactivity. Increasing number of valence electrons. From 1-8. reactions happen to satisfy octet rule. an atom with 1 ve- needs 7 to get to 8. It reacts more than an atom with 7ve- that only needs 1 more to get to 8.
A change in color after mixing chemicals is evidence of this.
What is a chemical change.
Burning is an example of this
a chemical change, reaction
This is an example of a pure substance that is made of more than one element.
What is water.
An element in the Halogen family, will most easily bond with a member of this chemical family.
What are the Alkali Metals and Hydrogen, Group 1
A change in temperature after mixing chemicals when you do not have an outside heat source (of course) is evidence of this.
What is either and Exothermic or Endothermic Chemical Reaction.
In all chemical reactions what is true. What is true for EVERY chemical reactions.
Atoms are not created or destroyed, they are only moved around. Mass of reactants always equals mass of products.
During the Boiling process water changes state from a liquid to a gas however it does not undergo a change in it's identity. It is still water. This makes boiling an example of this.
What is a physical change.