1.) D.electric charge 2.) B. Conduct the lighting away from the house
The option that correctly compares a pure substance to a mixture is: B. A pure substance can only be separated by chemical means, whereas some mixtures can be separated by physical means.
A pure substance can be defined as a substance that has a definite and constant (fixed) structure and they are typically made up of only a kind of particles. Thus, a pure substance is a chemical substance that has a constant (fixed) chemical composition and properties.
As a result of a pure substance being a chemical substance, it cannot be separated into its constituents by a physical separation technique or method.
Instead, a pure substance being a chemical substance can only be separated by chemical separation technique or method.
In contrast, mixtures can be separated by a physical separation technique or method.
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change in velocity=final velocity-initial velocity=9-3=6m/s
acceleration=change in velocity/time
=6/3=2m/s²
<span>Using Coulomb's law: k*(-0.3)*(-0.3)/(d^2)=19.2
D is the distance between the two negative charges</span>
Because the sound waves are being observed by the people that are there and it is not empty as in an empty place the sound waves will come back to you.