Deleon Chemistry- Chapter 4 test answers excluding math problems
3.17 g of sodium combines completely with chlorine to form 8 grams of sodium chloride. What is the mass of chlorine in this sample sodium chloride
4.83 g
A 20 g sample of solid carbon and 127 g of oxygen gas burn to form 73 g of pure carbon dioxide. If no other products are formed and all the carbon is reacted, what is the mass of the unreacted oxygen
74 g
12 g of solid carbon reacts with 4 g of an elemental hydrogen to produce natural gas. How much carbon and hydrogen I needed to make 100 g of natural gas
75 g of carbon and 25 g of hydrogen
Which of the following is a chemical change
A penny tarnishes
Which of the following illustrates an increase in potential energy
A person climbs a set of stairs
which of the following is a physical change
A rubber band is stretched
Which of the following is not a physical change
Burning candle
Combining hydrogen gas and oxygen gas to form water is a
Chemical change
which of the following is not a chemical change
Compression of oxygen gas
According to the law of conservation of energy, energy can be
Converted from one to another
as kelvin temperature decreases The average kinetic energy of the particles in a sample
Decreases
Which is not a chemical property
Freezing
in the reaction 16 H (aq) + 10 Br (aq) + 2 MnO4 (aq) —> 5 Br2(l) + 2 Mn (aq) + 8 H2O (l) The reactants are
H (aq) Br (aq) MnO4 (aq)
which of the following represents a physical change
H2O(s)—-> H2O(l)
Which of the following terms represents a form of energy
Heat
which of the following is a chemical property of chlorine
It combines with sodium to form sodium chloride
The quantity of heat required to raise the temperature of 1 g of a substance by 1°C is called
specific heat
An example of a physical property is
None of these choices
The change of vapors into ice is a
Physical change
Energy that matter possesses Due to its position is called
Potential energy
physical properties include all the following except
Reactivity with other substances
Which of the following is a physical change
Salt dissolving in water
Which of the following is a chemical change
Silver tarnishes
shiny silver colored strip of metal is heated in a hot flame. it turns powdery and white. When the flame is removed and the strip cools it remains powdery white. What can you conclude from these observations
This strip has undergone a chemical change
Which is not a physical property of water
Water reacts with sodium metal to produce sodium hydroxide and hydrogen
Which is not a physical property
fizzing
Which of the following is a chemical change
iron rusting
what is the SI unit for energy
joule
specific heat of aluminum is 900 j/g °C. How much energy is required to heat 45 g from 20°C to 50°C
1220 J
hydrogen combines with oxygen to form water. If 1.67 g of hydrogen completely combines with 13.33 g of oxygen what mass of water will be produced
15 g
A compound is decomposed into its constituent elements carbon hydrogen and oxygen. If on decomposition 6 g of carbon 3 g of hydrogen and 8 g of oxygen were formed, what was the mass of the compound before it was decomposed
17 g
how many joules of energy are required to raise the temperature of 150 g of water from 15°C to 45°C
18800 J
given the following list for a metal; melting point- 1600°C, density- 9.8 g/mL, volume- 35 mL, mass- 89 g; how many of the above can be used to characterize this metal
2
A sample of carbon monoxide has a mass of 4 g. What is the mass of oxygen in this compound if the mass of carbon is 1.71 g
2.29 g
15.6 g of a metal absorbs 836.8 J of heat energy that raises the temperature by 21°C. What is the specific heat of the metal
2.6 J
A 400 g sample of water is at 30°C. How many joules of energy are required to raise the temperature of the water to 45°C
25100 J
the following list represents properties of iron metal; melting point- 1538°C, density- 7.87 g/cm^3, atomic mass- 55.85 amu, undergoes oxidation in moist air; how many of these are physical properties
3
a 100 g iron rod is heated to an unknown initial temperature. while cooling down to a temperature of 25°C the rod releases 600.2 J of energy. What was the initial temperature
38.3 J
4.184 Jouels is equal to
0.513 cal
which is not a physical property
bleaching action
A sample of an unknown substance was tested in the laboratory. The sample could not be decomposed by chemical or physical means. based on there results, The laboratory reported that the sample is most likely an
element