1. Which star is brighter? Aldebaran or Betelgeuse 2. Which star is cooler? Rigel or Mira

3. Which star is larger in size? Polaris or Alpha Centauri B

4. Which star has a higher temperature? Tau Ceti or Procyon B

5. Which star is hotter? Regulus or Deneb

6. Which star is smaller in size? Sun or Antares

7. Which star is hotter? Altair or Rigel

8. Which star is dimmer? Antares or Sun

9. Which star is larger in size? Deneb or Mira

10. Which star is higher in temperature? Altair or Alpha Centauri A

11. Which star is hotter? Spica or Vega

12. Which star is a white dwarf? Procyon or Procyon B

1. explain hydrogen peroxide, h 2 o 2 properties and decomposition reaction. 2. describe how each of the following natural cycles plays a part in earth’s climate system. (a) the water cycle (b) the carbon cycle

How many protons, electrons, and neutrons are in each of the following isotopes? a. zirconium-90 b. palladium-108 c. bromine-81 d. antimony-123

Answer asap need to be answered by wednesday morning explain how a buffer works, using an ethanoic acid / sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.