Steve traveled the first 7 hours of his

journey at 40 mph and the last 9 hours

of his journey at 50 mph. How long is

the whole journey in miles?

-

miles

Give me number of significant figures in the number 40

Calculate to the correct number of significant figures: (24.6681 x 2.38) + 332.58

Which atom has the weakest attraction for electrons in a chemical bond? (1) a boron atom (3) a fluorine atom (2) a calcium atom (4) a nitrogen atom

What are the environmental advantages and disadvantages of a particular home site?

Hydrogen fuel cells combine hydrogen and oxygen to produce water and energy. Assume 1 kg of fuel is used, and the mass of the water produced is 1.10 x 10-11 kg. How much energy is produced by this fuel cell?

Consider a protein in which a negatively charged glutamic acid side chain (pKa=4.2) makes a salt bridge (ion-ion interaction) with a positively charged histidine side chain (pKa=6.5). Part A.

The amount of fossil fuel that can be

A cylinder contains oxygen at a pressure of 10.0 atm and a temperature of 300.0 K. The volume of the cylinder is 10,000 mL. What is the mass of oxygen gas?

4 - explicar as mudanças de estados fisicos da materia 6 - definir e exemplificar: -Ligações iônicas ou eletrovalente -Ligações covalentes ou molecular 7-definir substancias puras e suas clasificações 8-definir e exemplificar misturas homogeneas e

What ion forms when an acid is dissolved in a solution?