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CHEM 120 MIDTERM (CHAPTER 1-3) QUESTIONS WITH 100% CORRECT ANSWERS
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CHEM 120 MIDTERM (CHAPTER 1-3) QUESTIONS WITH 100% CORRECT ANSWERS
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Name: Score:93 Multiple choice questions
Term
copper (II) bromide
Hclo4
No And No2
Cahpo4
CuBr21 of 93
Term
ammonium ion
NH4+
Hclo4
7.79 X 10^-4
610 X 10^-42 of 93
Term
The Greeks proposed that matter consisted of four fundamental substances:
fire, earth, water, air
natural law
germanium is a metal
the greeks3 of 93 Term
Molecular formul a
tells you ho w much atoms of each el ement are in a compound
By either adding or subtracting el ectrons from the atom
The amount of product forme d when the l imiting r eactant is compl etely consumed
property of matter that is used as an ID tag for substances4 of 93
Term
Uncert ainty
property of matter that is used as an ID tag for substances
mixture unif orm in compo sition and pr opertie s throughout .
The amount of product forme d when the l imiting r eactant is compl etely consumed
the digit to the right of the number and mu st be e stimated, depends on the pr ecision.5 of 93
Term
NaC2H3O 2
calcium hy droxide
sodium acetate
natural law
nickel (ii) carbona te6 of 93 Term
A quantit ative obser vation
Germanium is a metal
Natural law
Mass
Contains a number and a unit7 of 93
Term
Express the number 0.000779 in scientific not ation
7.158 x 10^-4
7.79 x 10^-4
1.65 x 10^5
7.6 x 10^38 of 93
Term
Ga (Gallium)
one mol e of something consis ts of 6.022 x 10^23 units of substance
52 protons, 75 neutr ons, 54 el ectrons, 2- net charge
mixture of having a uniform compo sition and pr opertie s throughout and is usually called a
solution.
31 protons, 38 neutr ons, 31 electrons, 3+ net charge9 of 93 Term
Define Density
Force exerted by gravity of an object , most of the time it depends on gravity and change s
accordingl y to location.
property of matter that is used as an ID tag for substances
52 protons, 75 neutr ons, 54 el ectrons, 2- net charge
ion that has a positive charge (net 1+ charge)10 of 93
Term
Systematic Err or
known as the determina te err or, usually occurs in the same direction e ach time and varies
between high or always low.
exampl e: impr operl y measuring or having ina ccurate results.
a way that atoms, form bonds by sharing el ectrons; hel ps keep the atoms in a tight knit
bond
the giving off of rays of ener gy or particl es of breaking apart of atoms of certain
element s.
3 different emissions:
- gamma: gives off high ener gy
- bet a: particl es that are a high spee d electron
- alpha: p articl es that has a 2+ charge
By either adding or subtracting el ectrons from the atom11 of 93
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