Identify the particles and their charges that an atom is composed of.
A proton has a positive charge, a neutron has no charge or is neutral, and an electron has a negative charge.
100
What does the period number tell you about an element?
The number of electron rings around the nucleus of the element.
100
Is hydrogen a compound, element or mixture? How do you know?
Hydrogen is an element because it is on the periodic table, atomic number 1.
100
Name 2 techniques you can use to speed up a chemical reaction.
Increase the temperature, adda catalyst, increase the surface area, increase the concentration.
100
Whart are the two parts of a chemical reaction in a chemical equation?
the reactants and the products
200
Draw and label an accurate model of Chlorine. What family is chlorine in and what does this tell you about the element?
1s2
2s2 2p6
3s2 3p5
17 protons and neutrons in the nucleus
2 electrons in the first shell, 8 electrons in the second shell and 7 electrons in the third shell.
Chlorine is a halogen; loves to bond to create salts.
200
Which scientist is remembered for first organizing our current periodic table?
Dmitri Mendeleev
200
Is plastic a compound, element or mixture? How do you know?
Plastic is a mixture becasue plastic cannot be written using a single chemical formula and plastic is not on the periodic table of elements.
200
What must happen to the molecules for a chemical reaction to speed up?
When the molecules of the reactants collide they form the products. The more frequently the reactants collide the faster the reaction occurs.
200
A reaction that releases thermal energy.
What is an exothermic reaction?
300
The atomic number tells us how many of these are in an atom.
the number of protons
300
What is the group/family on the far right side of the period table and why are they called this?
noble gases because they do not easily bond with other elements.
300
Is salt a compound, element or mixture? How do you know?
Salt is a compound because it can be written using a chemical formula: NaCl.
300
What is the difference between an element and a compound?
An element is made of all of the same type of atoms with the same number of protons in the nucleus. A compound is made of two or more elements that are bonded together.
300
A reaction that absorbs thermal energy.
What is an endothermic reaction?
400
What happens if you remove 2 protons from Uranium?
You no longer have the element uranium you have Thorium.
400
This group often bonds with halogens.
Alkali Earth Metals
400
Is HCl a compound, element or mixture? How do you know?
hydrochloric acid is a compound because it can be written using a chemical formula: HCl.
400
What is the difference between an acid and an alkaline solution?
An acid solution has a pH that is less than 7 and an alkaline has a pH that is greater than 7
400
Can chemical reactions emit photons? Explain.
Yes - these would be exothermic reactions that emit heat (infrared photons) or visible light (visible photons)
500
Why do halogens love to bond with other elements?
Halogen elements love to bond because their outer shell does not contain a full load of electrons; they bond with other elements to gain their electrons.
500
Elements in the middle of the table are called______
transistion metals
500
Interpret the chemical formula for Aluminum chloride: AlCl3
Aluminum chloride has 1 aluminum atom and 3 chlorine atoms in every molecule of AlCl3.
500
Will an alkaline have excess hydroxide or hydrogen ions?
An alkaline will have an of excess hydroxide ions.
500
What must happen for a chemical reaction to occur?