Agroup of students designed a pamphlet. they used images and text to describe the chemical and physical changes that take place during cooking. which type of scientific model did the students design? a) an infographic because it visualize the molecular motion during the changes in nature. b) an infographic because the images improve understanding of the changes in matter. c) a graph because it shows interrelationship between two types of changes. d) a graph because it shows the effect of one variable on the other.

During a physical change the nature of the new substance formed remains the same in terms of its composition or the number of particles. Only properties like the state of matter, density, etc tend to change. In contrast during a chemical change the new substance is altogether of a different chemical composition.

Infographics makes use of images and text to help understand these concepts better through visualizations.

Ans : B)  An infographic because the images improve understanding of the changes in matter.

why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.

consider the reaction below.

 no rx

at 500 k, the reaction is at equilibrium with the following concentrations.

[pci5]= 0.0095 m

[pci3] = 0.020

[ci2] = 0.020 m

what is the equilibrium constant for the given reaction?

0.042

0.42

2.4

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