Answer: A. the transfer of heat by currents
Explanation: There are three modes of heat transfer:
1) Conduction: This type of heat transfer happens when there is direct contact between the two object. Example: heating a pan on stove.
2) Convection: This type of heat transfer happens when there is a movement of fluid (liquid or gas) due to the movement of hot layers to the top and cold layers to the bottom which leads to convection currents. Example: Heating of swimming pool.
3) Radiation: This type of heat transfer happens when there is direct transfer of energy through space. Example: Heating of earth's surface.
B. The transmission of heat across matter is conduction.
C. The electromagnetic radiation from the surface of an object which is due to the object's temperature is radiation.
D. The transmission of heat across empty space is radiation.
Answer:
A: The transfer of heat by currents.
Explanation:
Convection is the transfer of heat by currents, typically within a liquid or a gas. When heat is transferred by convection, matter flows.
a solvent is what is doing the dissolving. so in this case the water would be your solvent because it is dissolving the salt. does that make sense?
Answer:-64
Explanation:
One example would be the dissolving of molecules with water so that they can be transported.
C2H6O + O2
ethanol oxygen gas --------------------------------------------------
What elements will be present in the substances that are created when ethanol burns?
Answer:
Carbon, hydrogen, and oxygen only will be present in the substances that are created when ethanol burns.
Explanation:
Combustion means the process by which the burning of any substance, whether gaseous, liquid or solid, occurs.
Combustion reactions are reactions where oxygen intervenes as a reagent. Oxygen has the ability to combine with various elements to produce oxides, where then oxidation is the combination of oxygen with another substance. There are oxidations that are extremely slow, but when oxidation is rapid it is called combustion.
When a substance containing carbon and hydrogen (a hydrocarbon) undergoes complete combustion, or burning, oxygen is consumed and carbon dioxide is produced, and water.
Then the reaction is:
C₂H₆O + O₂ ⇒ CO₂ + H₂O
The law of conservation of matter states that since no atom can be created or destroyed in a chemical reaction, the number of atoms that are present in the reagents has to be equal to the number of atoms present in the products.
Then, you must balance the chemical equation. For that, you must first look at the subscripts next to each atom to find the number of atoms in the equation. If the same atom appears in more than one molecule, you must add its amounts .
The coefficients located in front of each molecule indicate the amount of each molecule for the reaction. This coefficient can be modified to balance the equation, just as you should never alter the subscripts.
And by multiplying the coefficient mentioned by the subscript, you get the amount of each element present in the reaction.
So, considering the above, the balanced chemical equation is:
2 C₂H₆O + 6 O₂ ⇒ 6 CO₂ + 6 H₂O
In the previous combustion reaction you can see that:
You can see that in a chemical reaction the elements in the reagents must be the same elements present in the products.
So, carbon, hydrogen, and oxygen only will be present in the substances that are created when ethanol burns.
Explanation:
Matter is defined as the substance that has mass and occupies space.
This means every matter will have mass and every matter will also have volume as it occupies space.
Every matter is made up of number of atoms as these atoms are the small sub-units that combine together and constitute a matter.
Hence, the statement atoms and compounds are made out of matter is not true.
As density is mass present in per unit volume. Therefore, every matter will vary in density.
Thus, we can conclude that characteristics that define matter are as follows.
Answer:
The answer to your question is: a, b and c
Explanation:
A.) Matter has mass. this option is correct, matter is formed by mass.
B.)Matter has volume (takes up space). this option is correct, matter takes up space.
C.)Atoms and compounds are made out of matter. This option is correct, all atomsand compounds are made out of matter.
D.) All matter has the same density. This optio is wrong, matter of different elements or compounds have different density.