which of these symbols represent a unit of volume? mL, mg, mm, cm
What is mL
100
according to the law of conservation of mass, when sodium, hydrogen, and oxygen form a compound then the mass of the compound is ____ the sum of the mass of the individual elements.
What is equal to
100
An atom is electrically neutral because the balance between these:
What is protons and electrons
200
A property of matter that does not change with the amount of matter, example: density
What is intensive property of matter?
200
A generalization that explains a body of known facts or phenomena.
What is a scientific theory
200
The quantity of matter per unit volume
What is density
200
In oxides of nitrogen atoms combine in small whole-number ratios, which supports the law of:
What is multiple proportions
200
Most of the volume of an atom is occupied by these:
What are electrons
300
A substance, made of two or more atoms that are chemically bonded, that can be broken down into simpler, stable substances.
What is a compound
300
a numerical result when its repeated measurements agree closely
What is precise
300
A change in the force of gravity on an object will affect its:
What is weight
300
Experiments with the cathode rays led to the dicovery of this.
What is electrons
300
Atoms of the same element that have different masses
What is isotopes
400
A change in matter that occurs at the molecular level and cannot easily be reversed.
What is a chemical change
400
The reason standards of measurement is used in scientific method
What is so they are reproducible in another laboratory
400
How many mL of water is 1.06 L
What is 1060 mL
400
Rutherford's experiments led him to conclude that atoms contain massive central regions that have this charge.
What is positive
400
The number of neutrons in Phosphorus-33 (atomic number 15)
What is 18
500
The unreactive elements on the periodic table
What are the noble gases in group 18
500
the plant food in an experiment with the hypothesis, "if more plant food is used then the plant will grow faster"
What is the independent variable
500
the four symbols of length written from largest to smallest
What are km, m, cm, mm
500
Nuclear forces are between what subatomic particles?