sanjsan

What activities are ways to reduce the negative impacts humans have on earths resources

If a nanometer is one billionth of a meter (0.000 000 001 m), how many nanometers are there in one meter?

Which physical state is described as having a fixed shape and fixed volume?

Supply the term that describes each of the following changes of physical state:
a) solid to liquid
b) liquid to gas

Supply the term that describes each of the following changes of physical state:
a) gas to liquid
b) liquid to solid

Indicate whether the following changes of physical state require heating or cooling:
a) solid to liquid
b) gas to liquid

Classify each of the following as an element, compound, homogeneous mixture, or heterogeneous mixture:

a) silver ingot
b) silver ore
c) silver oxide
d) silver alloy

Write the chemical symbol for each of the following elements:

a) strontium
b) xenon
c) oxygen
d) zinc
e) fluorine
f) sodium
g) copper
h) nickel

In H-NMR, which H would show up most downfield?

1. Compare chemical properties of metals and non metals. 
2. What is electronic effect? 
3.  

1.Isotopes iron-59 is used in__________.

A. Treatment of thyroid cancer

B. Bone marrow function 

C. Treatment of leukemia 

D. Spleen imaging

Al (s) + Fe2O3 (s) --> Al2O3 (s) + Fe (s)

How many grams of Fe can be produced when 69.2 g of Al is reacted with an excess (unlimited) supply of Fe2O3?

CaCO3 (s) --> CaO (s) + CO2 (g)

If 17.5g of CO2 is produced from the thermal decomposition of 42.73g of CaCO3, what is the percentage yield of the reaction? (Molar mass CaCO3= 100.09, CaO= 56.0774, CO2= 44.01)

Solve the systems by elimination.

2x + 4y = - 16

-2x + 2y =- 2

solve the system by elimination

6x - 10y = - 18

3x + 10y = 36

Fe2O3 (s) + 2 Al (s)= 2 Fe(l) = Al2O3 (s) a) What masses of iron (III) oxide and aluminum must be used to produce 22.0 g iron? iron (III) oxide ? g AND aluminum ? grams b) What is the maximum mass of aluminum oxide that could be produced ? ? grams