Show:
Balancing Chemical Equations
Chemical Changes
Atomic Structure
Chemical Formulas
Atomic Theorists
100
Balance the Chemical Equation Below H2+O2 -- H2O
2H2 + O2 ---2H2O
100
Is a bike rusting a chemical or physical change? How do you know?
Chemical change. Cannot be undone and color change.
100

what is the positive part of an atom? 

proton

100
In a chemical formula Ca would be called the _____
Chemical symbol or atomic symbol
100

Famous philosopher who first created the word atomos 

democritus 

200
Balance the chemical equation below H2 +O2 ---- H2O2
Balance Already
200
When you combine baking soda and vinegar is it a chemical or physical change? How do you know?
Chemical, formation of bubbles
200

What is the negative part of an atom? 

electrons 

200
In a chemical formula the small number to the right of an atom/element is called the _____
subscript
200

What scientist came up with the atomic model based off of some plum pudding 

jj thompson 

300

Balance the equation below ___N2 + ___O2 → ___N2O5

2N2 + 5O2 → 2N2O5

300
What is a precipitate?
A solid that is formed when two solutions combine chemically.
300

What two subatomic particles are in the nucleus of an atom? 

proton and neutron

300
In a chemical formula the large number before a molecule, used to balance the chemical equation is called the _____
coefficient
300

which theorist had the atomic model consisting of a nucleus based off of a gold foil experiment 

earnest rutherford 

400
Balance the equation below ___K + ___B2O3 → ___K2O + ___B
6K + ___B2O3 → 3K2O + 2B
400
Elephant toothpaste is a chemical change. What are 2 pieces of evidence that prove it is?
Formation of bubbles, change in temperature, cannot be undone.
400

If an element has an atomic number of 11 and an atomic mass of 22.99. How many electrons does it have? 

11

400
The left side of an equation is called the ______ and the right side is called the _________
reactants, products
400

which theorist thought that atoms were based off of the 4 elements 

aristotle 

500
Balance the Chemical Equation Below C6H6 + O2 → CO2 + H2O
2C6H6 + 15O2 → 12CO2 + 6H2O
500
What are the 5 signs of a chemical change?
odor change temperature change color change formation of a precipitate cannot be undone
500

If an element has an atomic number of 17 and an atomic mass of 35.45. How many neutrons does it have? 

18

500
The arrow in a chemical equation tells you.....
A chemical reaction occurred.
500

"According to Ancient Astronaut Theorists" is a quote from what scientifically inaccurate TV show?  

ancient aliens