How would you expect the boiling point of methane to compare with the boiling point of water?
The boiling points would probably be different, because products and reactants usually have different properties.
It is impossible to tell, because chemical reactions don't give us any clues about the properties of products
compared to reactants.
The boiling points would probably be the same, because products and reactants always have the same properties
The boiling points of methane and water would be different.
Connie and Dewayne know that solid potassium reacts very strongly with water, producing a chemical called potassium hydroxide along with hydrogen gas. They know the chemical equation looks like this.
2K + 2H20 -> 2KOH + some amount of H2
a. There are 4 atoms of hydrogen shown on the reactant side. How many total atoms of hydrogen must be on the product side?
(1 point)
• 2
• 4
• 6
• 8
The total number of atoms of hydrogen on the product side would be 4 atoms.
b. What does the law of conservation of matter (or the law of conservation of mass) tell the students? (1 point)
• Matter is never gained or lost in a chemical or physical process
• Matter is always gained or lost in a chemical or physical process
• Matter might be gained in a chemical or physical process.
• Matter might be lost in a chemical or physical process.
The law of conservation of matter (or mass) tells the students that matter is never gained or lost in a chemical or physical process.
c. Connie and Dewayne combine 78 grams of potassium with 36 grams of water.
What would they expect the total mass of the products to be? Why?
• the total mass of the products would be greater than 114 grams, because water is really heavy.
• The total mass of the products would be 114 grams, because mass cannot be gained or lost in the process.
• The total mass of the products would equal 78 grams, because the mass of water doesn't
make a difference.
• the mass burned into nothing, would be something less than 14 grams, because some of the mass is burned into nothing
The total mass of the products would be 114 grams because mass cannot be gained or lost in the process according to the law of conservation of matter.
b. What gives you a good clue that chemical reactions are used to convert natural resources into synthetic products?
•the properties of synthetic materials and the natural resources used to make them are different
•The properties of synthetic materials and the natural resources used to make them are the same.
• It's impossible to compare and contrast the properties of synthetic and natural materials.
• Synthetic materials and natural resources don't have any properties.
The clue that chemical reactions are used to convert natural resources into synthetic products is that the properties of synthetic materials and the natural resources used to make them are different.
To compare the boiling points of methane and water, we need to consider the molecular structures and the intermolecular forces involved. Methane (CH4) is a simple hydrocarbon with a tetrahedral shape, whereas water (H2O) is a polar molecule with a bent shape.
The boiling point of a substance is the temperature at which it changes from a liquid to a gas phase. This change occurs when the intermolecular forces holding the molecules together are overcome. Generally, stronger intermolecular forces result in a higher boiling point.
In the case of methane, it is a nonpolar molecule and the primary intermolecular force is London dispersion forces. These forces are relatively weak compared to other intermolecular forces. On the other hand, water is a polar molecule, which means it has dipole-dipole attractions and hydrogen bonding. These intermolecular forces are stronger than London dispersion forces.
Considering these differences, we would expect the boiling point of water to be higher than that of methane. However, to determine the exact boiling points, we can consult a reliable source such as chemical databases, scientific literature, or use online resources that provide boiling point data for specific compounds. This information can be useful in making accurate comparisons and predictions.