Flashcards in Chemistry Deck (43):
_______'s results are NUMERICAL
______'s results are made by using the senses
What value tells us the number of protons in an atom of an element?
What category are born and silicon in on the periodic table?
Which of the following represents a compound: F2, Br2, NO, Ca
What is matter?
Anything that has mass and takes up space
What is a physical property?
A characteristic of a substance that can be measured and observed without changing identity of substance (qualitative/quantitative)
Change of state is a __________ physical property.
Viscosity is a _______ physical property
What is sublimation?
Changing from a solid to a gas
Ductility is a _________ physical property
Hardness is a ________ physical property
Conductivity is a ____________ physical property
What is a chemical property?
The ability of a substance to change/react and form new substances
What are 3 examples of a chemical property?
Reactivity with acid, combustibility, corrosion (stability, toxicity)
What are the 5 points of the particle theory?
Particles, Identical, Spacing, Attraction, Movement
Matter is divided into 2 groups; _______ and _______
Mixtures (made up of 2 or more different types of particles) and pure substances (made of only 1 type o' particle)
What is the difference between mixtures and compounds?
Compounds are chemically combined while mixtures are physically combines
________ is a type of mixture in which you can see 2 or more phases
What is a physical change?
A change in matter that doesn't produce any new products or substances
What is a chemical change?
A change in matter that produces new substances
What are the 5 clues that a chemical change happened?
A new colour appears, heat is given off, bubbles of gas are formed, precipitate forms in a liquid, change is difficult to reverse
What is the mass number?
Total number of neutrons and protons
What are examples of subatomic particles?
Electrons, protons, neutrons
Burying garbage is a _______ change
Physical THEN chemical
Running a car motor is a _____ change
Dissolving sugar is a ___________ change
Melting wax is a ________ change
The number of valence electrons increases ___________
As you move across a period (is the same for elements in the same group)
The size of an atom increases as you move _________
Down or right to left
What are 2 ways that atoms can combine?
1. Gaining or losing electrons
2. Sharing electrons
What are ionic bonds?
Ions held together by their charges, very strong (crystal lattice)
What are covalent bonds?
Atoms held together because they are sharing electrons
What is viscosity?
The measure of a substance's resistance to flow (viscous = slow)
What is melting point?
Temperature where a solid turns into a liquid
What is solubility?
A measure of the ability of a substance to dissolve in another
What is ductility?
The ability of a substance to be stretched into a wire
What is hardness?
A substance's ability to be scratched
What is conductivity?
A substance's ability to conduct electricity or heat
What is combustibility?
A substance's ability to burn in air
What is corrosion?
A substance's ability to react with air to form an oxide
What is stability?
A substance's ability to remain unchanged