Flashcards
Unit 1 Assessment
Cards in this deck (21)
- 1K -> CC = K - 273.15
- 2F -> CC = (F-32) * 5/9
- 3When are numbers significant? When are numbers not significant?Significant
- non-zero digits
- zeroes in-between non-zeros
- trailing zeros with decimal point
- every digit in scientific notation
Not Significant
- leading zeros - 4How do you round with sig figs when adding or subtracting?use the most uncertain value's sig figs & round the answer accordingly
- 5How do you round with sig figs when multiplying or dividing?Use the least number of sig figs & round the answer accordingly
- 6What are the metric prefixes?M- Mega (10^6)
k- kilo (10^3)
c- centi (10^-2)
m- milli (10^-3)
μ- micro (10-6)
n- nano (10-9)
p- pico (10^-12) - 7What is the equation for density?Density= Mass/Volume
d= g/cm^3
d= g/mL - 8What is the proportion of Avogadro's number?6.02 * 10^23/1mole
- 9What distinguishes the phases from one another?Solids- keep volume & shape
Liquids- keep volume not shape
Gas- Don't keep volume or shape - 10Pure Substances vs. MixturesPure substances:
- elements & compounds
Mixtures:
- homogeneous & heterogeneous - 11Elements vs. Compounds- Elements (Au)
- Compounds (NaCl) - 12Heterogeneous vs Homogeneous- Heterogeneous
(a mixture that varies within the sample)
-Homogeneous
(uniform throughout & looks the same) - 13Physical vs. Chemical propertiesPhysical Property:
boiling point, melting point, color, density
Chemical Property:
reactivity, flammability, toxicity - 14Extensive vs. Intensive propertiesExtensive Property:
- mass, volume
- will change with amount
Intensive Properties:
- boiling point, melting point, color, density
- will not change with amount - 15Describe the modern (nuclear) model of the atom and identify subatomic particles.- The nucleus consists of protons & neutrons
- Electrons are arounds the nucleus & are attracted to the protons because opposites attract
- Electrons are much smaller
- If the number of electrons & protons are equal, it results in a neutral atom
- If the number of electrons & protons are not equal, it results in an ion (cation or anion) - 16What are the charges of the subatomic particles?- Protons- positive
- Neutrons- neutral
-Electrons- negative - 17Make an argument for the existence of atoms, electrons, and the nucleus.The existence of atoms, electrons, & the nucleus can be proven by expl
- 18What is the Atomic Theory & who created it?- Dalton
- all matter is made up of atoms
- atoms are neither created or destroyed in chemical reactions
- compounds are combinations of two or more atoms
- all atoms of a given element are identical in size, mass & other properties - 19What is the law of multiple proportions?- supports Dalton's Atomic Theory
- there is a fixed ration for two elements to form more than one compound - 20What is the Cathode Ray Experiment & who conducted it?- J.J. Thompson
cathode rays- beams of electrons
- named electrons
- found that cathode rays were deflected by the electric field
- charge-to-mass remained the same regardless of the metal used to generate them - 21What is the alpha particle (gold foil) experiment & who conducted it?- Rutherford
- found that the alpha particles passed through the gold foil but some shot off trajectory
- this lead him to conclude that the nucleus of the gold had a positive charge
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- Chemistry Flashcards on Unit 1 Assessment , created by angel perez on 06/02/2023.
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