Atoms/Matter
Gold is composed of only one type of these.
What are atoms?
This is where the most reactive metals are located on the periodic table.
What is the far left group?
Color change is evidence that this type of reaction has occurred.
What is a chemical reaction?
This must be true if the number of atoms stays the same regardless of how they are arranged.
What is their total mass stays the same?
This is how periods on the periodic table are organized.
What is increasing atomic number left to right?
This is what the atomic number represents.
What is the number of protons?
These are physical properties of all elements in the rightmost group of the periodic table.
What is gas state at room temperature?
This is what most likely has occurred if, when combining baking soda & vinegar, bubbles form.
What is gas formation?
This is what the compound potassium sulfate (K2SO4) is composed of.
What are 2 atoms of potassium, 1atom of sulfur, & 4 atoms of oxygen?
Sand at the beach would be this type of mixture.
What is heterogeneous?
When water boils, this is a physical change that occurs.
What is water vapor is produced & escapes into the air?
The ability to conduct electricity under certain conditions is a property of these.
What are metalloids?
This is what happens when a precipitate forms.
What is the production of a solid?
If a student combined 32 grams of a chemical & an unknown amount of another, this would be the mass of the unknown amount if the product's mass is 114 grams.
What is 82 grams?
This is how the atoms are combined in a mixture.
What is physically combined & can be separated?
Elements in the same group on the periodic table are similar in that they have the same number of these.
What are valence electrons?
This characteristic of elements determines their placement on the periodic table.
What is the number of protons?
This is a chemical reaction that absorbs heat energy.
What is an endothermic reaction?
This best describes how to balance the following chemical equation:
Mg + O2 --> MgO
What is add the coefficient 2 before Mg on both sides of the equation?
This is the pH of water if it is neither an acid or base.
What is 7?
When chemicals react in a closed container, this must be true.
What is that the mass both before and after the reaction is the same?
This describes the purpose of the bold staircase line on the right side of the periodic table (where the metalloids are located).
What is to separate metals from nonmetals?
Compounds are held together by these.
What are chemical bonds?
This best explains why, at the end of an experiment, only 82% of the mass of the initial reactants was present.
What is the other mass escaped as a gas?
This group of elements would most likely gain electrons.
What are the halogens (group 17)?