I need help with simple chem homework

Overview

Submit your completed homework on pdf/word doc/jpeg format. This is a online submission. Show all the calculation to obtain full marks. Just writing or choosing answer makes your points "o"

1. Write the number of significant figures in each of the following and express each number in exponential notation.DO NOT ROUND!

A.0.0078881
B. 788000000000000000.

C. 30.0

D. 1000

E. Calculate volume of box using correct significant figure, when width is 15.56 cm, length = 27.36 height = 5.4325 cm

Pt=13

1. The weather forecast predicts the temperature will reach 40⁰ C. Express this temperature in Kelvin and in Fahrenheit. Show all the calculations.

Pt=6

1. You just measured a sugar cube and obtained the following information:
   mass = 3.48 g
   height = length = width = 1.3 cm
   Determine the volume and density of the cube. Show all the calculation Pt=10

Suppose the sugar cube was added to a cup of water. Before it dissolves, will the sugar cube float or sink to the bottom? Explain your answer.

1. Calculate atomic weight of chlorine. When ³⁵Cl (34.969 amu) with an abundance of 75.78% and ³⁷Cl (36.966 amu) with an abundance of 24.22%. Show all calculation

Pt=10

1. Name the following compounds:

a). Li₃N
b). HBr
d). H₃PO₃

_{These are all the questions you have to answer}