Elements
is H2O and element?
no. its a compound
how does a compound form?
chemically combined elements
lemon juice has a pH of 2, water has a pH of 7, and dish soap has a pH of 13.5. what is dish soap- be specific.
a distinct property of elements that is used directly to sort the periodic table
metal/ nonmetal/ metaloids
After you've completed your research by collecting data and observations, and its time to write your conclusion, do you go back and erase/change your hypothesis if the data proved it wrong?
No, you write in your conclusion how it was proven to be wrong, by using the data you collected as evidence.
How many elements are present in NaOH?
3
give 3 examples of the physical properties for compounds
litmus paper turns red when indicating acids, what color does it turn to indicate a base?
Blue
what way do periods go on the periodic table?
across/ rows
You've just finished your experiment on testing several solutions for their pH measurements. in order to find more accurate results you ask your classmate to _____________ the lab
replicate
How do elements combine to form new things?
atoms in an element combine in a multitude of ways to produce compounds that make up all living and nonliving things.
give 3 examples of chemical properties to compounds
flammability, reactivity, acidity, ability to rust/tarnish, combustion, oxidation
what is the number range on the pH scale for acids?
1-6
elements in the same row (period) have the same what?
number of occupied energy levels
DOUBLE JEOPARDY: What is the difference between independent and dependent variables in an experiment?
independent variable: is changed (I CONTROL)
dependent variable: affected by the change
ex: plant growth (dependent) on the amount of watering(independent)
there are a _______ amount of elements? starts with an "f"
finite- small
Are there any compounds listed on the periodic table?
no
DOUBLE JEOPARDY: does a base react with a metal?
NO
the columns on the Periodic table are call groups. Elements in the same group have similar ____________?
chemical properties
in order to make an experiment more accurate, it's important to have several trials. this is an example of
repetition
How many elements are in C6H12O6
3
Is there any way to count how many compounds we know of, like we do with elements?
no, not really! there are too many, and some we don't know of yet.
you start with an acidic solution, what will happen when you add a basic solution?
Neutralization. (a salt and water will form)
Elements in the same columns (group) have the same what?
the same number of electrons in the last occupied energy level. (valence electrons)
True or False: the more trials you attempt in an experiment, the more accurate your results will be.
true