# Chemistry is the science of matter, especially its chemical reactions, but also its composition, structure and properties. Chemistry deals with atoms and their interactions with other atoms, and particularly with the properties of chemical bonds. Chemistry also involves understanding the properties and interactions of individual atoms and molecules for use in larger-scale applications.

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##### Stephanie C.

University of Central Florida

##### Allea C.

University of Maryland - University College

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So for the next problem will be calculating the number of sick picks for this number. Eso whatever. You're giving something in scientific notation and you want to calculate the number of sick pigs. Um, it is best to write out the scientific notation impossible. Eso Here we have 5.2100 times 10 something in the fourth eso if we write it out here because this is being multiplied by 10 to the negative fourth. That means our decimal place is moving toward the left. Because if it were positive, uh, eventually right, um and so we can write zeros here and the decimal place. We moved to a lot four times. So 1234 So then our new number of U 0.0 five to 2100 eso again for sig figs. These heroes, you don't count because there are place holders and so we'll be counting all of the significant figures after the zeros. So that means we have one thio three 456 So we have six numbers se fakes. And this is because anything that is non zero will contribute one significant figure zeros that are sandwiched between two non zero numbers also contribute, um, to the significant number account and trailing zeroes, Um that are after a decimal place also contribute to significant figures, and so we have six in total for this number.

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##### Stephanie C.

University of Central Florida

##### Allea C.

University of Maryland - University College