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Ivytech Chem 101 Midterm Updated Questions With Verified Answers 2025/
The definition of a scientif- ic law is
a number of similar obser- vations generalized into a brief statement summariz- ing past observations and predicting new ones Which statement about a hypothesis is TRUE
All of the above state- ments are true. Which of the following is an example of a scientific law
In a chemical reaction, matter is neither created nor destroyed.
A sample of wood with a mass of 3.0 grams was burned in an open dish. The ashes weighed 1. grams. What happened to the rest of the wood?
The remaining 1.8 grams was converted into gaseous compounds.
Which statement would NOT be an example of "quantification"
The water in the swimming pool feels colder than it was yesterday.
A popular science demon- stration is to take several liquids that will not mix to- gether and "stack" these liquids in a tall glass cylin-
der. Suppose the following three liquids were places in the same tall, narrow glass cylinder:
SUBSTANCE DENSITY
(g/mL) vinegar 1. motor oil 0. corn syrup 1. These liquids would stack in which order?
motor oil on top, vinegar in the middle, corn syrup on the bottom
Suppose a boat engine leaks 938 mL of oil into a lake. The mass of this spilled oil is 823 g. The oil will not mix with the lake water. Which statement is true?
The oil will float because its density of 0.877 g/mL is less than the density of water.
Determine the answer to the following equation with correct number of signifi- cant figures:
The correct number of sig- nificant figures in the num- ber 0.027090 is:
Physical properties are
those that a substance dis- plays without changing its composition
Which type of energy is as- sociated with the burning of gasoline
chemical
Which type of energy is as- sociate with motion
kinetic
Which state of matter has atomic spacing that is close together and indefi- nite shape?
liquid
When methane is burned with oxygen the products are carbon dioxide and water. If you produce 18 grams of water from 8 grams of methane and 32 grams of oxygen, how many grams of carbon
dioxide were produced in the reaction? Which of the following items is a pure substance ice
All of the following can be considered physical prop- erties EXCEPT:
flammability
Which type of energy is as- sociated with position potential
Which of the following statements is FALSE
All of the above state- ments are true
Which state of matter has indefinite shape and is compressible
gas
What is the atomic symbol for silver
Ag
How many neutrons are found in Ne-
What is the mass number of the hydrogen isotope that contains 2 neutrons?
Fluorine is considered which of the following? molecular element
What is the name of Ca(NO3) calcium nitrate
The ionic compound that forms between potassium and oxygen is:
K2O
What is the formula mass for potassium ni- trate, KNO
101.10 amu
What is the correct name of the compound whose formula is N2O4?
dinitrogen tetroxide
What is the name of HNO2? nitrous acid
How many of each type of atom are there in the for- mula Ca3(PO4)2?
Ca = 3, P = 2, O = 8
How many of each type of atom are there in the for- mula (NH4)2 HPO4?
N = 2, H = 9, P = 1, O = 4
How many atoms of lithi- um are in 18.7 g 1.62 x 1024 atoms
How many moles of car- bon are in 3.5 moles of cal- cium carbonate, CaCO3?
3.5 mol
What is the mass percent of chlorine in hydrochloric acid, HCl?
One half of a mole of atoms would contain how many atoms?
3.011 x 10^
What is the mass in grams of 5.40 moles of lithium?
37.5 g
How many molecules of sulfur trioxide, SO3, are in 78.0 grams?
5.87 x 1023 molecules
How many moles of potas- sium are in 156.4 g
4.000 mol
How many atoms are in 5.80 moles of He? 3.49 x 1024 atoms
What is the mass of 1.56 x 1021 atoms of magnesium in grams?
0.0630 g
- Na2SO4 (aq) +BaCl (aq) ö BaSO4 (aq) +2 NaCl (aq)
- H2SO4 (aq) + NaOH (aq) ö Na2SO4 (aq) + 2H2O (l)
The reaction CH4 (g) + 2O2 (g) ö CO2 (g) +2 H2O (g) is:
all of the above
When water is heated, bubbles form in the water. Is this evidence of a chem- ical reaction? Why?
Np, boiling water is a phys- ical change.
Methane gas (CH4), on complete combustion in air, produces:
1. CO
2. H
3. H2O
1 and 3 only
Which of the following statements about balanc- ing reactions is FALSE?
When coefficients are added the type of com- pound is changed in the chemical reaction. Before a chemical equa- tion can be written, one must know:
The symbols and formulas of all reactants and prod- ucts
