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Carry out the following conversions: (a) 242 lb to milligrams, (b) $68.3 \mathrm{cm}^{3}$ to cubic meters, (c) $7.2 \mathrm{m}^{3}$ to liters, (d) $28.3 \mu$ to pounds.

$$6.24 \times 10^{-8} l b$$

Chemistry 101

Chapter 1

Chemistry: The Study of Change

Intro to Chemistry

Rice University

University of Maryland - University College

Lectures

02:29

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.

04:42

In chemistry and physics, matter is any substance that has mass and takes up space by having volume. All everyday objects that can be touched are ultimately composed of atoms, which are made up of interacting subatomic particles, and in everyday as well as scientific usage, "matter" generally includes atoms and anything made up of them, and any particles and objects that act as if they have both rest mass and volume. However it does not include massless particles such as photons, or other energy phenomena or waves such as light or sound. Matter exists in various states (known as phases) that are defined by various physical properties, such as state of matter, phase, shape, and density. The Standard Model of particle physics and the general theory of relativity describe fundamental particles and the fundamental forces acting between them that control the structure and dynamics of matter.

02:46

Carry out the following co…

06:24

02:47

to carry out these calculations, we do need to recognize the number of significant figures in each step. So for the 1st 1 we're going to convert pounds two grams when there's 453.59 grams in a pound. We have three significant figures here. More than that here. The one is exact. This one also is exact definition and the 1000 is exact. So we're limited. Three significant figures of our first number, 1.10 attended the eight milligrams that will go from Centimeters Cube two meters cute, knowing that there's a hunt for everyone. Meter. There's 100 centimeters, but we need to cube that. So are cubed units here. Canceling will get meters cube. These numbers are exact, were limited to three here. So we have 6.83 10 of the negative five meters cubed. Then we have two significant figures here. We'll go from meters cube, two centimeters cube, using the reciprocal of the conversion factor we had up here. Then we were in Centimeters Cube. You know, there's 1000 Centimeters Cube, her leader, and all of these numbers are exact except his 1st 1 with two significant figures. So we rounded two significant figures 7.2 times 10 to the three leaders here. We've got three significant figures in micrograms. We know that for every one microgram, there's one times 10 the negative six grams. We can then go from grams into pounds, knowing there's 453.59 grams in a pound. This number is not exact, but has five significant figures. This one is exact, but we have three here. So around three significant figures 6.24 10 of the negative £8.

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