Elements:
What element on the periodic table of elements is number 1
Hydrogen is number one
What are examples of a physical changes involving water?
Melting, freezing, vaporization, condensation
What are reactants in a chemical change?
The substances that go into a chemical reaction
What is the first rule of PEN
Atomic number=# of protons
Heat is absorbed from the environment during this type of chemical reaction.
Endothermic
What element is B on the periodic table of elements
Boron is B
What are three pieces of evidence a physical change has taken place.
1. Change in State of Matter
2. Change in size or shape
3. Substances stay the same
What are the new substances that are formed by a chemical reaction called?
Products
What is the second rule of PEN
Atomic mass=# of protons + # of neutrons
Heat is released during the reaction during this type of chemical reaction.
Exothermic
What are the yellow elements called
Transition Metal
What is a physical change?
The material involved in the change is structurally the same before and after the change. (you can go back to your original form)
What is a chemical change?
a change of materials into another, new materials with different properties and new substances are formed
(Something can go back to its original form or can be changed back)
# of protons is equal to what
# of protons=#of electrons
This type of reaction forms bonds. It is bond making.
Exothermic Reactions
What are the grey elements called
Actinoids
Is burning wood considered a Physical change?
No, because it cannot be changed back to its original form.
Heat and light are produced.
Name five pieces of evidence a chemical change has taken place.
Color change, heat and light produced, production of a gas, formation of a solid, new substances (products) are formed, cannot easily be reversed, temperature change
What is the third rule of PEN
# of protons=#of electrons
This type of reaction forms bonds during the reaction. This is a bond breaking reaction.
Endothermic Reaction
What is plutonium's number
94 is correct
Frost forming on the grass is an example of a chemical or physical change? Why?
Physical change.
Change of state of matter from a liquid to a solid.
How does a chemical change, change a substance?
(*hint it's something to do with the atoms and molecules)
When bonds are broken and/or formed between molecules or atoms creating new substances (products) that are different from the reactants.
# of neutrons=atomic mass + # of protons
During the liver lab, which of the experiments was endothermic? How do you know?
Baking soda and vinegar because the temperature dropped.
What is mass and number of lawrencium
mass is 168 and number is 103
Describe why slicing pizza is a physical change but baking a pizza is not.
When you slice pizza... you still have pizza. (The substance doesn't change.)
When you bake pizza the individual ingredients that make up the pizza change into something else.
During the splint test after the liver and hydrogen peroxide reaction, the splint began to glow and relit. What can we conclude about the products for this reaction?
Oxygen was produced as fire needs it to fuel combustion.
Why is PEN inportent
It can help with solving elements and easier to identify too
During the liver lab, the first splint relit when it was placed inside the test tube. Why was the second flame extinguished during the flame test?
All of the oxygen created by the reaction was used up during the splint test. The reaction was over so no more oxygen was being produced.