# Posts by Vikki

Total # Posts: 25

**math**

*"<_" is less than equal to* 5) -15<x-8<-4 6)12<_4n<28 7)-2<_3b+7<_13

**Chemistry**

if a flask of 750 ml of 0.80m of nacl solution was left, and 275 ml evaporated, what is the new concentration

**Chemistry**

If 6.0g of CH4 and 5.0g of O2 are used, what is the mass of CO2 produced?

**chm**

The equilibrium constant for the equation 2 H2(g) + CO(g) CH3OH(g) Is 19 at a certain temperature. If there are 3.11 x 10-2 moles of H2 and 5.79 x 10-3 moles of CH3OH at equilibrium in a 6.75 L flask. What is the concentration of CO? What is the Kp at 1439 °C for the ...

**chm**

The equilibrium constant for the equation 2 H2(g) + CO(g) CH3OH(g) Is 19 at a certain temperature. If there are 3.11 x 10-2 moles of H2 and 5.79 x 10-3 moles of CH3OH at equilibrium in a 6.75 L flask. What is the concentration of CO? At 1280 °C the equilibrium constant for...

**Biology 12**

The question is asking to calculate the overall energy change in the combustion of ethane (C2H6). This is what I have done: The balanced equation: C2H6 + 6 O2 --> 2 CO2 + 3 H2O (6) 411 + 346 + (6) 494 --> (2) 799 + (3) 459 2466 + 346 + 2964 --> 1598 + 1377 = 5776 = ...

**Biochem 12**

Calculate the energy released per gram of propane when it is burned in a combustion reaction. The chemical formula for propane is C3H8.

**chm**

An aqueous solution that is 10.0 percent sulfuric acid (H2SO4) by mass has a density of 1.143 g/mL. Determine the molality of the solution. ( 3 significant figures)

**12 U Math**

Solve and check for extraneous roots. log_2x+log_2(x+2)=3 * _2 is a subscript and (x+2) isn't a superscript*

**Math**

Solve the equation. Check for extraneous roots. 4^2x-4^x-20=0

**Trigonometry**

A variant on the carousel at a theme park is the swing ride. Swings are suspeneded from a rotating platform and move outward to form an angle x with the vertical as the ride rotates. The angle is related to the radial distance,r, in metres, from the centre of rotation; the ...

**Math Gr 12**

Use a calculator to determine angle x, rounded to the nearest degree. csc x = 1.25

**english**

According to Jean Piaget, in what is all learning based? A. Sensorimotor learning B. Preoperational learning C. Concrete operational learning D. Formal operational learning 2. Which of the following questions is a thinker/doer most likely to ask? A. Why? B. What? C. How? D. ...

**East Asia,and south easia**

With respect to human rights issues in Southeast Asia, which statement is most accurate?

**Probability**

Suppose that an unfair coin comes up heads 54.1% of the time. The coin is flipped a total of 13 times. a) What is the probability that you get exactly 6 heads? b) What is the probability that you get exactly 6 tails? c) What is the probability that you get at most 9 tails?

**TRIG**

tan^-1(5.5/6.2) =41.6 ^^^using a TI-84 PLUS^^^

**U.S. History**

One example of government trying to help American business was a) high tariffs. b) patronage c) blue laws d) Munn v. Illinois

**world history**

Civilizations in the Americas and sub-Saharan Africa were isolated from Eurasia mostly because of?

**algebra**

Got hung up with what to do about the 7 and did not attach the 9 to the left side. Thank you!

**algebra**

2x+(x-y)^3 when x=9 and y=7 This problem is from a test review sheet (answer included)I have almost filled a notebook trying to solve this.

**world issues**

Is fair trade a solution for farmers in the developing world?

**SraJMcGin,**

thankyou ! :)

**Geography**

please could someone help me answer these questions ...? globalisation brings many problems describe all the benefits in all the different stages of production and countries. globalisation brings many benefits describe all the benefits in all the different stages of production...

**Org. Chem.**

The alkene would be formed via an E1 mechanism because it is formed by an elimination reaction in a dehydration reaction between n-butyl alcohol, a primary alcohol, and sulfuric acid, an obviously strong acid. The ether would be formed via Williamson ether synthesis, which is ...

**math**

three-fourths of a gallon is how many eights of a gallon?