How many significant figures are expressed in the number 0.732 ? What is the dec
ID: 834042 • Letter: H
Question
How many significant figures are expressed in the number 0.732 ?
What is the decimal form of 5.87x10-3 ?
If there are 4 quarts in 1 gallon and 1.06 quarts in 1 liter, how many liters are in a 42 gal barrel of oil?
Changes that alter the form of matter without changing its basic chemical composition are called
The prefix meaning 1,000,000 is
Is barium sulfate, BaSO4, an element or a compound?
Given CH4 + 2 O2 ? CO2 + 2 H2O, what is (are) the product(s) of this reaction?
By definition, atoms of the same element have the same number of
Bromine-80, 8035Br, is an isotope of bromine. Bromine-80 has Blank 1 protons and Blank 2 neutrons.
Atoms of the same element having differing numbers of neutrons are called
Outer electrons are called ____ electrons.
Quantization of energy for electrons means
Selenium (Se) has ____ valence electrons.
In one molecule of chromium (III) nitrate, Cr(NO3)3 there are
Blank 1 atoms of Cr
Blank 2 atoms of N
Blank 3 atoms of O
and it has a molar mass of Blank 4 g/mole.
How many moles of calcium hydroxide, Ca(OH)2, are in 4.2 g of Ca(OH)2 ? (The molar mass of Ca(OH)2 = 84 g/mole)
The molar mass of calcium oxalate, CaC2O4, is 128 g/mole. What is the % (by mass) of carbon in calcium oxalate?
Ethanol reacts with oxygen to form carbon dioxide and water. Balance the chemical equation. (If any of the coefficients is 1, place a 1 in the answer block. Do not leave any answer blank.)
Blank 1 C2H5OH + Blank 2 O2 ? Blank 3 CO2 + Blank 4 H2O
What is the name of Co(NO3)2 ?
The correct name for the SO3-2 ion is
In the reaction P4 + 5 O2 ? 2 P2O5, how many moles of O2 are consumed each time 1.25 moles of P2O5 form?
A solution that has as much solute dissolved as possible is
The Periodic Table is organized with elements having similar chemical properties placed in
The combustion of methane (in natural gas) forms carbon dioxide and water:
CH4 + 2 O2 ? CO2 + 2 H2O
How many grams of CO2 are formed for every gram of CH4 that combusts?
4.25 g of NaNO3 (molar mass = 85 g/mole) are dissolved in 100 mL of H2O. What is the molarity of the resulting solution?
A viscous liquid
Explanation / Answer
How many significant figures are expressed in the number 0.732 ? 3
What is the decimal form of 5.87x10-3 ? 0.00587
If there are 4 quarts in 1 gallon and 1.06 quarts in 1 liter, how many liters are in a 42 gal barrel of oil?
= (1/1.06)x(4/1) lit/gal x 42 gal= 158.5 L
Changes that alter the form of matter without changing its basic chemical composition are called Physical Changes
The prefix meaning 1,000,000 is Mega
Is barium sulfate, BaSO4, an element or a compound? Compound
Given CH4 + 2 O2 ? CO2 + 2 H2O, what is (are) the product(s) of this reaction?
Products -> CO2 ;H2O
By definition, atoms of the same element have the same number of electrons
Bromine-80, 8035Br, is an isotope of bromine. Bromine-80 has 35 protons and 45 neutrons.
Atoms of the same element having differing numbers of neutrons are called isotopes
Outer electrons are called __valence__ electrons.
Quantization of energy for electrons means
Selenium (Se) has __6_ valence electrons.
In one molecule of chromium (III) nitrate, Cr(NO3)3 there are
1 atoms of Cr
3 atoms of N
9 atoms of O
and it has a molar mass of 238 g/mole.
How many moles of calcium hydroxide, Ca(OH)2, are in 4.2 g of Ca(OH)2 ? (The molar mass of Ca(OH)2 = 84 g/mole) 4.2/84 = 0.05 moles
The molar mass of calcium oxalate, CaC2O4, is 128 g/mole. What is the % (by mass) of carbon in calcium oxalate? 24/128x100 = 18.75 %
Ethanol reacts with oxygen to form carbon dioxide and water. Balance the chemical equation. (If any of the coefficients is 1, place a 1 in the answer block. Do not leave any answer blank.)
1 C2H5OH + 3 O2 ? 2 CO2 + 3 H2O
What is the name of Co(NO3)2 ? Cobalt Nitrate
The correct name for the SO3-2 ion is Sulphite
In the reaction P4 + 5 O2 ? 2 P2O5, how many moles of O2 are consumed each time 1.25 moles of P2O5 form? 5/2x1.25 = 3.125 moles of O2
A solution that has as much solute dissolved as possible is Saturated
The Periodic Table is organized with elements having similar chemical properties placed in same Group
The combustion of methane (in natural gas) forms carbon dioxide and water:
CH4 + 2 O2 ? CO2 + 2 H2O
How many grams of CO2 are formed for every gram of CH4 that combusts? 1/16x44 = 2.75 grams CO2
4.25 g of NaNO3 (molar mass = 85 g/mole) are dissolved in 100 mL of H2O. What is the molarity of the resulting solution? (4.25/85)/100 x1000 = 0.5 M
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