Chemistry 1111

The Study of Change

100

_____ is the study of matter and the changes it undergoes. 

Chemistry 

200

1. _________ mixture is a composition that is the same all throughout. 

2. _________ mixture is a composition that is not uniform all throughout. 

1. Homogeneous

2. Heterogeneous  

300

1. What is the formula of density.

2. Find the density of a piece of gold with a mass of 301 grams and has a volume of 15.6cm^3. 

1. density= mass/volume

2. 16.3 g/cm³ 

explanation:

301g/15.6 cm³ = 19.3 g/cm³

400

1a. How do you convert Celsius to Kelvin?

1b. Convert 238.9 °C into Kelvins

2a. How do you convert Celsius to Fahrenheit? 

2b. What is 87 °C in Fahrenheit? 

1a. K= °C + 273.15

1b. 512.05K

Solution: 238.9+273.15= 512.05

2a. (C°*180/100)+32

2b. 188.6

Solution: (87C°*180/100)+32= 188.6 F°

500

1. Determine the number of significant figures in the following measurements.

a. 478 cm

b. 0.825 m

c. Why is 9000 mL an ambiguous case? 

1a. 3 significant figures

1b. 3 significant figures

1c. The number of significant figures can't be determined because it could be 9.000x10³, with 4 significant figures; 9.00x10³, with 3 significant figures; 9.0x10³, with 2 significant figures, or 9x10³, with 1 significant figure. 

Atoms, Molecules, and Ions

100

What is being described:

All elements are composed of atoms. All atoms of a given elements are identical.... not done

Dalton's Atomic Theory of 1808