The periodic table is in increasing atomic mass. Hope this helped.
Answer:
Chemical reaction.
Explanation:
Changes in color and temperature indicates a chemical reaction has taken place.
A chemical reaction involves two species combining to give a product. They are usually a product of chemical changes between two combining species.
In a chemical change;
- New kinds of products are formed
- There are heat changes accompanying such reactions.
- We can have color changes but it is not all indicative.
<u>Answer:</u>
A measurement standard is defined as 'the exact quantity people agree to use for comparison'.
<u>Explanation:</u>
For the same type of quantity, there is a unit of measurement which is defined and adopted either conventionally or by law which is used as standard for measurement of that quantity.
This measurement standard is defined as 'the exact quantity people agree to use for comparison'.
For example, for length the standard unit of measurement is 'meter'.
Answer:
To correct the defects of vision by measuring the radius of curvature and thus the power of the lenses.
Explanation:
A spherometer is an instrument used to measure the curvature of objects such as lenses and curved mirrors.
Generally it consists of a fine screw which is moving in a nut carried on the center of a 3 small legged table or frame. The feet forms the vertices of an equilateral triangle. The lower end of the screw and those of the table legs are finely tapered and terminate in hemispheres.
If the screw has two turns of the thread to the milli meter the head is generally divided into 50 equal parts, so that differences of 0.01 millimeter may be measured without using a vernier scale.
The spherometer is used to measure the radius of curvature of the lenses so that the opthalmologist find the focal length of the lens and then give the power to the lens to correct the defects of vision.
