Physical science exam 1) a scientist carries out an experiment. how could she other scientists judge the validity of her results? a. use confusing language in her report b. let other scientists closely review her work c. prevent others from seeing her data d. keep her experimental procedure a secret 2) which type of graph is best used to show the amount of product formed under different reaction conditions? a. box and whisker plot b. circle graph c. bar graph d. scatter plot 3) how are chemical and physical changes different on a molecular level? a. chemical changes involve the breaking of bonds in molecules. b. chemical changes do not affect bonding between atoms. c. physical changes do not involve molecules. d. physical changes cause new molecules to form.

b. let other scientists closely review her work

d. scatter plot

a. Chemical changes involve the breaking of bonds in molecules.

Explanation:

Scientists publish their work in peer reviewed journals  such that their work can be replicated by independent labs all over the world, and as a result scientific consensus can be reached

Scatter plot shows both positive, negative and no correlation between different amount of products formed under different experimental conditions.  

Chemical changes involves the formation of new bonds and breaking of old bonds such that new products are formed that are chemically completely different from the reactants. In a physical change there is no change in the chemical composition of the material but the substance undergoes a change in phase.  

water   molecules stay close to each other through cohesion, the collective action of hydrogen bonds between water molecules. cohesion plants draw water upwards from the root through the stem's transport tubes (xylem) to the leaf. this transport occurs even in large trees and against gravity. transpiration, evaporation of water from plant leaves, creates a tension on water molecules being pulled up from the stem and roots.

water also has high (the attraction of one substance to another) properties because of its polar nature. adhesion of water molecules to plant cell walls counteract gravity while water is transported from roots to leaves.

water exhibits a very high surface tension when compared to other liquids. surface tension is a property of a liquid that holds the surface together and allows it to resist an external force. by capillary action, the water forms concave menisci inside the pores. the high surface tension of water pulls the concavity outwards, generating enough force to lift water from the roots to the leaves of plants.

thus, cohesion, along with adhesion and surface tension creates a capillary action that keeps water molecules interacting and moving through the plants out to the leaf cells.

therefore, option d) is the correct answer.

explanation: