Bekah

What is the variable being tested in an experiment called?

14 years ago

The number of trophic levels that can be maintained in an ecosystem is limited by: a. a gain in population size b. the loss of potential energy c. the number of individuals in the ecosystem i have chosen a but it is for a grade and i would love some help?...

14 years ago

A 8.00 M solution of hydrochloric acid is provided. You need to make 25.0 mL of a 0.490 M HCl solution. What volume, in mL, of the 8.00 M solution should you use?

14 years ago

Iron (II) ions can be precipitated from the following reaction: 4Fe(OH)+(aq) + 4OH-(aq) + O2(g) + 2H2O(l) --> 4Fe(OH)3(s) How many grams of oxygen gas will be needed to precipitate the iron contained in 125mL of 0.085M Fe(OH)+ solution?

14 years ago

How many grams of solute are needed to prepare each of the following solutions? A. 1.000 L of 0.180 M NaCl B. 250.0 mL of 0.150 M CuSO4 C. 500.00 mL of 0.355 M CH3OH

14 years ago

Zinc, copper, lead, and mercury ions are toxic to Atlantic salmon at concentrations of 6.42 times 10 to the -2 mM, 7.16 times 10 to the -3 mM, 0.965 mM, and 5.00 times 10 to the -2 mM, respectively. What are the corresponding concentration is milligrams p...

14 years ago

Calculate the concentrations of the following solutions, assuming the volumes are exact measurements: a. 18.64g of sodium hydroxide in 350mL of solution b. 8.97mL of 18M hydrochloric acid in 250mL of solution

14 years ago

How many milliliters of 0.100 M HNO3 are needed to neutralize the following solutions? A. 45.0 mL of 0.667 M KOH B. 58.5 mL of 0.0100 M Al(OH)3

14 years ago

Write formation reactions for the following. (You must include the states of matter for each atom or compound) A. Ca(NO3)2 (s) B. CH3OH (l) C. NaClO4(s)

13 years ago

when a 0.702g sample of a mixture of volatile hydrocarbons is burned in a bomb calorimeter with a heat capacity of 4287 J/C, the temperature rises by 4.72 degrees C. How much energy (in kilojoules) is released during combustion?

13 years ago

is this true:Introductory participial phrases and adverb clauses are set off from main clauses by commas.

13 years ago

a man's age today is 2 years more than three times the age his son will be 5 years from now. let a represent the son's age today. Write an expression to represent the man's age today. Then find his age if his son is now 8 years old.

10 years ago

First off, it is one thing to ask for assistance because you do not understand something. It is a completely different thing for someone to give you all of the answers. It really is your loss though, because instead of getting the reasoning why and unders...

15 years ago

the info of about the circle is irrelevent. Since the triangel is isosceles than that means another side of it is 4r. Find the missing side then use the area of a triangle formula!

14 years ago

-72/14*14/-72 (cross multiply) ?

14 years ago

R because the others all have set limitations. R is the only one that makes sense! Since numbers can go on forever that means numbers greater than 18 would be infinite!

14 years ago

Step 1: Eric = 1/2 of Dans; Eric + Dan = 18 Step 2: 12 + 6 = 18 Step 3: Eric has to be 6 because half of 12 is 6 and when you add them together you 18. Step 4: Equation- Part A: D = 12; E = 1/2D; T= 18. Equation- Part B: E + D = T so... 1/2D + D = 18!!!!...

14 years ago

Solubility and Precipitation: 1. Alkali Metal Cations, ammonium cations= Soluble. 2. Nitrate Anions, Acetate Anions= Soluble. 3. Halogen anions= Soluble...except: Ag+, Cu+, Hg2 +2, and Pb+2. 4. Sulfate Anions= Soluble...except: Ba +2, Ca+2, Hg2 +2, Pb+2,...

14 years ago

A is the correct answer.

9 years ago

A and D are right.

9 years ago

They cannot explode like a nuclear bomb, that's for sure.

8 years ago

A trick is to just look for the element in the equation that is paired on one side, but not on the other. This being said, the following answers are correct. Redox: 2CO+O2 = 2CO2 Zn+CuCl2 = ZnCl2+Cu Non-Redox: SO3+H2O = H2SO4 HCl+NaOH = H2O +NaCl

8 years ago

144/24 = 6

8 years ago

The correct answers are: 1.) C 2.) A 3.) C 4.) D 5.) A 6.) B 7.) A 8.) B

8 years ago

What in the world...

8 years ago

I already did this and the correct answer is C.

6 years ago