Friday

April 18, 2014

April 18, 2014

Total # Posts: 39

**science**

is a dishwasher a wheel and axle

**science**

What are examples of inclined planes in the kitchen?

**Algebra 2**

How do solve (x^2/3) +1 = 9?

**Algebra 2**

Write x in terms of e: ln x^2 = 8. Is it e^2√2 = x?

**Chemistry**

Given the balanced equation representing a reaction: Cao(s) + CO2(g) ---> CaCO3(s) + heat What is the total mass of CaO(s) that reacts completely with 88 grams of CO2(g) to produce 200. grams of CaCO3(s)? I don't understand what you have to do.

**Chemistry**

Which quantity of particles is correctly represented by the formula H2SO4? Explain.

**Chemistry**

A rigid cylinder contains a sample of gas at STP. What is the pressure of this gas after the sample is heated to 410 K? a. 1.0 atm b. 0.50 atm c. 0.67 atm d. 1.5 atm Explain how you get the answer.

**Chemistry**

but can't you simplify that to CH3

**Chemistry**

why

**Chemistry**

What is the empirical formula of a compound that has a carbon-to-hydrogen ratio of 2 to 6? Is it CH3?

**Chemistry**

The gram-formula mass of NO2 is defined as the mass of one mole of a. one mole of NO2 b. one molecule of NO2 c. two moles of NO d. two molecules of NO Explain why.

**Chemistry**

thanks

**Chemistry**

A sample of gas confined in a cylinder with a movable piston is kept at constant pressure. The volume of the gas doubles when the temperature of the gas is changed from a. 200. K to 400. K b. 200. C to 400. C How do you know if it's kelvin or celsius? k= c + 273, by the way.

**English**

What kind of figurative language is in "She pulled in her horizon like a great fish-net,". Is it both a hyperbole and a simile?

**Chemistry**

thanks!

**Chemistry**

At STP, a 7.49-gram sample of an element has a volume of 1.65 cubic centimeters. The sample is most likely (1) Ta (3) Te (2) Tc (4) Ti How do you get the answer?

**Chemistry**

What is the only positive ion found in H2SO4(aq)? a. ammonium ion b. hydronium ion c. hydroxide ion d. sulfate ion The answer's b, but I don't understand why.

**Chemistry**

thanks

**Chemistry**

Why, in terms of atomic structure, is the radius of an Na atom larger than the radius of an Na+ ion?

**Chemistry**

In calcium, the electron configuration is 2-8-8-2. Why does the 3rd level have more energy than the 2nd if they're both 8?

**Chemistry**

Which element requires the least amount of energy to remove the loosely held electron from a gaseous atom in the ground state? a. bromine b. calcium c. sodium d. silver How do you know?

**Chemistry**

How is the chemical bonding in Na3PO4 both covalent and ionic?

**Chemistry**

Magnesium nitrate contains chemical bonds that are ? 1. Covalent Only 2. Ionic Only 3. Both Covalent And Ionic 4. Neither Covalent Nor Ionic The answer is 3, but I don't know why. How does NO3 even bond?

**Chemistry**

Which formula represents a molecular compound? (1) Kr 3) N2O4 (2) LiOH (4) NaI How do you know?

**Chemistry**

The chemical bond between which two atoms is most polar? (1) C–N (3) S–Cl (2) H–H (4) Si–O How do you find out?

**Global History**

Was the middle class satisfied with the steps Napoleon took to restore order to France?

**Algebra 2**

How do you simplify (x^3+x^2-x-1)/(x^3-x^2-x+1)?

**Algebra 2**

When you simplify 5^-1(3^-2*2^-3), is it 1/360?

**Chemistry**

thanks

**Chemistry**

An atom contains a total of 29 electrons. When the atom is in the ground state how many principle energy levels will contain electrons? a: 1 b: 2 c: 3 d: 4 How do you figure this out?

**Chemistry**

What is the total number of principal energy levels or shells in an atom with an atomic number of 30? and why? (1) 3 (2) 4 (3) 5 (4) 6

**Chemistry**

thanks

**Chemistry**

Compare the amount of heat required to vaporize a 200.-gram sample of H20(L) at its boiling point to the amount of heat required to melt a 200.-gram sample ofH20(s) at its melting point.

**Algebra 2**

When you solve 6 + 5|2r-3|≥ 4, is the answer r ≥ 13/10 and r ≤ 17/10?

**Algebra 2**

thanks

**Algebra 2**

so t=0 or t=-1 or t=1, and the solution set is {0,-1,1}?

**Algebra 2**

Is this how you solve t^3 - t = 0? t(t^2-1)=0 t(t-1)(t-1)=0 t=0 or t=1 {0,1}

**Algebra 2**

the solution set

**Algebra 2**

When you solve t(t+1)(t-2)=0, is the solution {0, -1, -2}?

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