C. magnetic forces act at a distance
Explanation:
Since he was able to drag the keys along the table by moving the magnet, it shows that magnetic forces acts a distance.
Magnetism is a property exhibited by a wide range of materials.
Around a bar magnet, there are field forces in which the forces of the magnets are felt.
- Magnetic forces are non- contact forces. They don't need to be together to exert their force.
- This is why magnetic forces act at a distance.
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Where is the other statements
Answer:
Heat added to substances makes the molucelues move faster and spread out.
Explanation:
First we assume that the compound containing only C,H,and
O is combusted completely in the presence of excess oxygen, so that the only
things that can be produced are water and carbon dioxide.
From there we should back calculate the amount of
Hydrogen that is in the original sample by taking all of the hydrogen in the 0.239g
to came from the organic compound.
And since we know that the original mass of the sample
was .100g, we can also easily get a mass % H by taking the mass Hydrogen
calculated over the total original mass (.100 g)
So that:
0.239g H2O / (18.01 g/mol) = .01327 moles H20
.01327 Moles H20 * 2.02g H (per every mole H2O) = .0268g
H initially present in the sample
.0268g H / .100g sample = 26.8% H by mass
Answer:
B.
the number of carbon-carbon double bonds
Explanation:
Triglyceride is the ester which is derived from the glycerol and three units of fatty acids.
There are two types of triglycerides which are saturated and unsaturated triglycerides.
<u>Saturated fats are the triglycerides in which there is not double bond between the carbon atoms. These have higher value of melting point and are solid at the room temperature. </u>
<u>Unsaturated fats are the triglycerides which have some double bonded carbon atoms. These have lower value of melting point and are liquid at room temperature.</u>
