Science chapter test
How many groups are there in the modern periodic table?
18
How many protons do atoms of lead (Pb) have?
82
false
All the periods of the modern periodic table contain the same number of elements.
true
All the periods of the modern periodic table contain the same number of elements.
true
In each period, the atomic numbers increase from left to right
what is magnesium sulfate made out of?
Magnesium, sulfer, oxygen
false
Sodium is a nonmetal
false
Sodium is a nonmetal (modern)
false
The modern periodic table organizes all the known elements by increasing atomic number
false
The modern periodic table organizes all the known elements by increasing atomic number.
mixture
a combination of 2 or more substances that are not chemically combined
What is a column on the modern periodic table called?
a group
suspension
a mixture in which the particles remain suspended over time ex: salad dressing/ flour water (they do not disperse evenly
solution
a mixture made up of a solute and a solvent ex: sugar water/ salt water
compound
a substance made up of 2 or more different elements that are chemically combined where the elements have the same proportion and composition
what is calcium carbonate made out of?
calcium, carbonate, oxygen
each substance has a unique what?
chemical formula and composition
how do 90 elements create millions of different substances
combining non-chemically
What does the periodic table organize?
elements
What is a column on the modern periodic table called?
group
What are elements organized by in the modern periodic table?
increasing atomic number
What are elements organized by?
increasing atomic number
Which class of elements conducts electricity?
metals
What does the number of each period in the modern periodic table represent?
number of energy levels containing electrons
Which particles in the nuclei of atoms are used to arrange the elements in the modern periodic table?
protons
Which particles in the nuclei of atoms are used to arrange the elements?
protons
how did Mendeleyev organize the periodic table?
similarities in chemical properties
what happened when ascorbic acid and sodium bicarbonate
small bubbles, quick reaction, and it produced gas or created a precipitate
what is sodium chloride made out of
sodium and chlorine
why do new substances form after a chemical reaction?
the atoms rearrange because there is empty space
What do chemical formulas help to show
the composition of substances
different substances will never have the same what
the same elements in exact same proportions
what happened when ascorbic and sodium carbonate
there were large bubbles, quick reaction, and it had a long duration
what happened when ascorbic acid and calcium carbonate combined
there were large bubbles, slow reaction, and there was a color change
what is a substance
two or more elements that are chemically combined