B. A physical change is a change from one state of matter to another; a chemical change results in a new substance formed.
C. A physical change produces a new element, and a chemical change results in a bond breaking between atoms.
D. A chemical change results in a new element being formed, and a physical change results in a new compound being formed.
Answer:
A physical change is a change from one state of matter to another; a chemical change results in a new substance formed.
Physical properties:
Physical properties are those which have same composition. In other words, composition does not change, only state may be change like solid to liquid, liquid to gas, solid to liquid etc.
Example.
Water when freezes into ice, it is physical change, just state is change.
Chemical properties:
The chemical properties depend upon composition.
Example:
Formation of precipitates is an example of chemical change.
Answer:
32 m/s
Explanation:
Frequency is the number of waves that pass a particular point in 1 second
Wavelength is the distance between 2 crests or 2 troughs
Speed = frequency x wavelength
Substituting the values
Speed = 4 Hz x 8 m
Speed = 32 m/s
Waves speed is 32 m/s
Question 7 options:
Their speeds are the same.
the object with the greater speed has greater kinetic energy
the object greater speed has the lower kinetic energy
the object with the smaller mass has the greater kinetic energy
Answer: Option (B) is the correct answer.
Explanation:
Kinetic energy is the energy due to the motion of an object.
Mathematically, K.E =
where m = mass
v = velocity
Therefore, an object whose velocity is more will have more kinetic energy.
Thus, we can conclude that out of the given options, the object with the greater speed has greater kinetic energy is true about their kinetic energy.