Draw a model of hydrogen 12. Include Protons, Neutrons and Electrons
Answer----
100
Is Melting a candle a physical or chemical change?
What is a physical change
100
Define matter
What is anything that has mass and volume
100
What 2 substances form the nucleus of an atom?
What is proton and neutron
100
What is the amu of each particle in an atom
proton 1 amu
neutron 1 amu
electrons 0 amu (they do have mass, but it is so little it is considered 0)
200
Draw a model of Boron 10
Answer is .....
200
is reactivity with water a chemical or physical property
What is chemical
200
Define Physical change and list an example
What is a change that affects one or more physical properties of a substance
Examples- multiple
200
How many protons, neutrons and electrons does carbon-14 have?
6 protons
8 neutrons
6 electrons
200
List three clues that a chemical change has taken place.
Examples- color change, bubbling, fizzing or foaming, heat, production of light, sound, or odor.
300
How many neutrons does the isotope flourine-20 have
What is 11
300
iron and steel on a car that is painted does not rust, but if you get a scratch or chip in the paint and don't fix it rust will begin to form. Why?
What is paint is not reactive with oxygen, but iron and steel are.
300
Define chemical change and give an example
What is when one or more substances are changed into entirely new substances with different properties.
300
Explain why atoms are neutral.
Same number of protons and electrons.
Protons have a positive charge and electrons have a negative charge. They have the number so the charges cancel each other out.
300
What is the formula for calculating density?
Density equals mass divided by volume
400
Draw a model of lithium--8
What is ...
400
What is the difference between a chemical change and a physical change?
Chemical changes occur when one or more substances are changed into entirely new substances with different properties. A physical change only affects physical properties.
400
What does the word solubility mean? Is it a chemical or physical property?
What is the ability to dissolve into another substance. It is a physical property.
400
Explain why the atomic number is what identifies the element.
Atomic number tells how many atoms are in the nucleus of each atom of an element. Every element has a unique number of protons in the nucleus.
400
How do you find the volume of a gas?
find the volume of the container that it is in.
500
Draw how many protons an neutrons does copper-64 have
What is 29 protons and 35 neutrons
500
Aluminum can be rolled or pounded into sheets to make foil. What is this an example of?
What is malleability
500
What is the difference between mass and weight
mass is the amount of matter that something is made of. It doesn't change wherever it is measured. weight is a measure of gravitational force exerted on a object and can change depending on where it is measured. Same on Earth.
500
What happens to an atom if it gains electrons in a chemical reaction?
It becomes a negatively charged particle called an ion. (anion)
500
Explain why neutrons are necessary in the nucleus of an atom.
If they weren't there the positively charged atoms would repel each other and it would not be stable.