Dutchess

A student finds that it takes 39.98 mL of 0.2418 M NaOH to titrate 30.00 mL of sulfuric acid solution. Determine the percent mass of the sulfuric acid in the solution when the molarity of sulfuric acid is 0.1612M. (you may assume that the density of the sulfuric acid solution is the same as pure water).

2NaoH + H2SO4 ---> Na2SO4 + 2H2O

Molar mass of sulfuric acid: 89.086

A 750. mL solution containing potassium chloride is evaporated to dryness and 662.93 milligrams of solid potassium chloride are collected. What was the molarity of the original solution?

I have no idea how to do this problem, and I'm pretty good at this stuff too :/ please explain? It'll help :)

When 4.93 grams of silver metal are dropped in 1000. mL of 2.0 M acetic acid, how many liters of gas are evolved at STP?

When 1.43 grams of aluminum metal are dropped in 600. mL of 6.0 M hydrochloric acid, how many liters of gas are evolved at 20°C, 1.08 atm?

Could you please explain :) It would really help me!

Equation: 2Al + 6HCl ---> 2AlCl3 + 3H2

please and thank you!

When 4.935 g of calcium hydroxide is reacted with a 18.0 mL of a 0.200 M sulfuric acid solution how many grams of calcium sulfate and water are formed?

It's a bit confusing for me!

thanks! i have no idea how to do this problem. th .200 M is throwing me completely off!

thanks! :)

Can be solid, liquid, or gas at room temperature

Conducts electricity when in liquid state

Involves bonding between two non-metals

Are all solids at room temperature

Involves a sharing of electrons

Have an electronegativity difference of more than 1.7

Have an electronegativity difference of less than 1.7

Involves a complete transfer of electrons

Tend to form extended lattices or crystals

Exist as separate molecules

Which of the following are true regarding ionic substances (check all that apply):?

Can be solid, liquid, or gas at room temperature

Conducts electricity when in liquid state

Involves bonding between two non-metals

Are all solids at room temperature

Involves a sharing of electrons

Have an electronegativity difference of more than 1.7

Have an electronegativity difference of less than 1.7

Involves a complete transfer of electrons

Tend to form extended lattices or crystals

Exist as separate molecules

Calculate the mass in kilograms of the amount of each of the following lead compound that contains 5.0 103 kg of lead:

PbS

My professor asked me to complete and balance this equation, but I'm completely lost! I've never even seen the compound NaOCH3!

NaOCH3(aq) + H2O(l) →

Ican't seem to tell what kind of reaction this is? Ca(s) + 2 H2O(l) → Ca(OH)2(aq) + H2(g)?

It can be more than one of these.

acid-base

double-displacement

gas evolution

oxidation-reduction

precipitation

single-displacement

synthesis

My teacher tells me its redox, but when I input it the answer online for my homework its wrong!

It can be more than one of these.

acid-base

double-displacement

gas evolution

oxidation-reduction

precipitation

single-displacement

synthesis

Alright. I've known my friend Katie for about three years. We weren't really close, but she was always in the same group of friends and I really enjoyed her company. Well, a couple of weeks ago, she introduced me to her boyfriend's best friend, whom I'm now in a really great relationship with. However, she's has become a complete betch. (Sorry for that). Her personality is very mean, but everytime she 'jokes' with me, she's constantly bringing me down with her words. She never has anything nice to say to me, joking or not. I've tried talking to her about it but she just said its just the way she is and she's only 'joking'.

I can't ignore her because she's in my social group, and I'm afraid that one day I will explode on her.

What should I do?

Sadly enough I was blessed to genetically carry a gene that causes major dark circles. REALLY dark circles. My eyes look hollow. Any good make up concealers out there to cover up without looking like I caked it on? Please and thank.

LGBT: my girlfriend is asexual? now what!?

she's okay if we never ever have sex.

she doesn't like touching me

doesn't find me sexually attractive.

I've never heard of femmes or lipstick lesbians having stereotypes.

That or I'm super sheltered.

Thanks a bunch~

[=~