1. all matter is made up of tiny particles called atoms
2. atoms are neither created nor destroyed in chemical reactions
3. atoms of different elements are combined in whole number ratios and more than one ratio is possible for a given combinations of elements
4. each element it made up of different kinds of atoms , and the atoms of different elements have different masses
Answer:
A. How much decay happens in each flashlight
Explanation:
In an experiment, the DEPENDENT OR RESPONDING VARIABLE is the variable that responds to changes being made to another variable called Independent variable. It is the variable that is measured by an experimenter.
In this question, an experiment was carried out to research the effect of sunlight on plastic decay. Three plastic flashlights were used for this experiment in which one was placed in a dark closet (control), and the others were placed in light at different times or intervals. However, the variable being measured or assessed is the decay of each flashlight. This means that "HOW MUCH DECAY HAPPENS IN EACH FLASHLIGHT" is the dependent variable.
Answer:
Answer is 80
Explanation:
Mass number is equal to the number of protons + neutrons = 45 + 35 = 80