Physical/Chemical Changes & Properties
What kind of change occurs when ice melts into water?
Physical
What is the type of matter made of one type of atom that cannot be broken down by chemical means? (All the same color)
Element
What type of elements is the majority of the periodic table made up of?
Metals
Which subatomic particle is negative?
Electrons
Created or destroyed
Is rust forming on metal a physical or chemical change?
Chemical
When two substances are combined chemically, forming a new substance. Ex. NaCl (Two or more colors connected)
Compound
What group is the most reactive?
Group 1 (alkali metals)
What subatomic particles are located inside the nucleus?
Neutrons and Protons
In a balanced equation, the reactants should equal the ____________
Products
The color, texture, and density of a substance are all examples of what type of property?
Physical
Different atoms occupying the same space, but only physically combined. (Two or more colors, not connected to one another)
Mixture
Elements in the same __________ have similar properties and reactivity.
Group/Family
What does the atomic number tell you?
Number of protons
A chemical reaction occurs that produces gas. What type of system would make the mass on the scale stay the same both before and after the reaction?
Closed system
Two substances are added to the same container and bubbles are formed. What type of change has occurred?
Chemical
When two or more atoms of the same type are chemically bonded, such as O2
Molecule
Which group or family is the LEAST reactive?
18/ Noble Gasses
What does subtracting the atomic number from the atomic mass tell you?
The number of neutrons
If 10 g of hydrogen reacts with 80 g of oxygen, what is the total mass of water produced?
90g
A reaction causes fire to be produced. What type of heat-related chemical reaction has occurred?
Exothermic
What type of substance is salt water?
Mixture
What does the group or family number tell you?
The number of valence electrons
What should be true about the number of protons compared to the number of electrons?
They should be equal
A student places 12 grams of baking soda into a sealed bag with 24 grams of vinegar. The two substances react to form carbon dioxide gas, water, and a salt. After the reaction finishes, the bag and its contents are weighed.
36g