What's It Made Of?
PS.8.1.1
This substance is made of only one type of atom and its chemical formula contains only one symbol from the Periodic Table.
What are elements?
PS.8.1.2
A neutral particle found in the nucleus that adds mass to the atom.
What is a Neutron?
PS.8.1.3
These elements are found in Group 18 and are known for being very unreactive.
What are noble gases?
PS.8.1.4
Ice melting into liquid water is an example of this type of change.
What is a physical change?
PS.8.1.5
In a chemical equation, this number tells how many particles (molecules or formula units) of a substance are involved in the reaction.
What is a coefficient?
PS.8.1.1
A substance with the chemical formula CO₂ is best classified as a—
What is a compound?
PS.8.1.2
This negatively charged particle moves around the outside of the nucleus.
What is an electron?
PS.8.1.3
This tells you the number of protons in an atom of an element.
What is the atomic number?
PS.8.1.4
Cutting a sheet of paper in half changes its size but not what it is made of. This type of change is called a __________ change.
What is a physical change?
PS.8.1.5
In the formula H₂O, this part of the formula tells how many hydrogen atoms are in one molecule of water.
What is the subscript 2?
PS.1.1
A particle diagram shows different types of particles not bonded together but evenly mixed so every section looks the same.
How would this substance be classified?
What is a homogeneous mixture?
PS.8.1.2
A student builds a model of an atom and places most of the mass in the electrons because “they move around the most.” Is this model correct if not why is it not?
What is most of an atom’s mass is in the nucleus (protons and neutrons), not the electrons, which have very little mass.
PS.8.1.3
Elements in the same column (group) on the periodic table have the same number of these.
What are valence electrons?
PS.8.1.4
A substance changes color and releases heat when two materials are mixed. These observations indicate this type of change.
What is a chemical change?
PS.8.1.5
When a chemical reaction occurs, atoms are not created or destroyed; instead, they do this to form new substances.
What is rearrange?
PS.8.1.1
Italian salad dressing contains oil, vinegar, and herbs that separate over time.
Explain why this substance is classified as a heterogeneous mixture.
What is because the particles are not evenly distributed and different parts of the mixture look different?
PS.8.1.2
This subatomic particle determines the identity of an element and is equal to the number of neutrons in a neutral atom (correct mistake)
What is a proton, and it is equal to the number of electrons, not neutrons?
PS.8.1.3
An element is found in Group 1 of the periodic table. Based on its position, predict one physical or chemical property it is likely to have.
What is that it is highly reactive?
PS.8.1.4
When vinegar and baking soda are mixed, bubbles form and a new substance is produced. Identify the type of change and the evidence that supports your classification.
What is a chemical change shown by gas formation and the creation of a new substance?
PS.8.1.5
A model shows 2 magnesium atoms reacting with 1 oxygen molecule to form magnesium oxide. To conserve mass, this coefficient must be added to MgO in the equation
Mg + O₂ → ___ MgO.
What is 2?
A particle diagram shows two different types of particles evenly mixed together in the same container, and none of the particles are bonded to each other.
What is a homogeneous mixture, because it contains more than one type of particle that are not bonded together and are evenly distributed throughout the mixture?
PS.8.1.2
This atomic model shows a positively charged nucleus with negatively charged particles around it—identify the subatomic particles shown and their locations.
What are protons and neutrons in the nucleus and electrons outside the nucleus?
PS.8.1.3
This stair-step line on the periodic table separates metals from nonmetals.
What is the metalloid (zigzag) line?
PS.8.1.4
A student heats a solid until it melts, then continues heating until it produces a gas and a new substance forms. Classify each change and explain your reasoning using evidence.
What is the melting as a physical change and the gas production with a new substance as a chemical change, supported by changes in state versus the formation of new matter and energy changes?
PS.8.1.5
In an open system, a reaction seems to lose mass because a gas escapes. Explain why this does not violate the Law of Conservation of Mass and translate the balanced equation
2H₂ + O₂ → 2H₂O
into a word description.
What is: mass is conserved because atoms are released to the environment, not destroyed, and two molecules of hydrogen react with one molecule of oxygen to produce two molecules of water?