A. A liquid changes to a solid.
B. A solid changes to a gas.
C. A gas is released from a liquid.
D. A liquid changes to a gas.
Option C:
A gas is released from a liquid
Hope this will help :)
two or more substances combine chemically
two or more substances combine but keep their physical properties
two or more substances combine and create an irreversible reaction
Mixtures are combination of two or more substances which can be separated based on their physical properties. Hence, option c best describes a mixture.
Mixtures are substances formed by the combination of two or more individual components. The mixing can be of physical or chemical type. The individual components can be separated using some techniques based on their physical properties.
There are both homogenous mixtures and heterogenous mixtures. In homogenous mixtures the components are uniformly mixed and form a single phase.
Heterogenous mixtures are composed of components forming different phases. They can be easily separated using simple techniques. Irrespective of the type of mixing, the physical properties of the components are maintained as such in a mixture. Hence, option c is correct.
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Answer: two or more substances combine but keep their physical properties or two or more substances combine and create an irreversible reaction.
Explanation: Because i tried the other two and they didnt work so yeah thats life and i got a d on my test thx for the wrong info person before me.
Is my definition right?
Answer : When the forces are acting in the same direction of movement of the object it can be said as sum of the two individual forces will be equal to the "NET FORCE" .
Example : If two forces (2 kids pushing in the same direction to move the object big box) act on an object(big box) in the same direction, then the net force is equal to the sum of the two forces.
electromagnetic wave, mechanical wave, or both.
Electromagnetic wave travels faster through air than metal.
Option A
Explanation:
There are different kinds of wave energy. The most significant are electromagnetic and mechanical waves. The mechanical waves propagate through the medium by transfer of energy by vibrating of particles in medium.
So, the more number of particles present in the medium, the more fast the mechanical wave can propagate. So the mechanical waves travel faster in metals consisting of more number of free charge carriers. But electromagnetic waves does not need any of the medium to propagate. So it can travel faster in air than in metals.
(2) a negative ion
(3) an atom in an excited state
(4) an atom in the ground state
Answer;
-(3) an atom in an excited state
Explanation;
-An electron in a sodium atom gains enough energy to move from the second shell to the third shell. The sodium atom becomes an atom in an excited state.
-Ground state is the lowest allowable energy state of an atom. When electrons are subjected to stimuli like heat, light or electricity an electron may jump to a higher energy level, which is the excited state. Excitation is the elevation in energy level above the baseline energy state.