# Posts by roro

Total # Posts: 42

**chemistry**

what is the method to prepartion CO from these equation in the lab CaCo3 + 2HCl ? CaCl2+H2O+ CO2 (g) Or CaCo3 ----(Heat 500 to 600 C0? Cao +Co2 (g) 2- CO2 + H2 ? CO (s) + H2O(g) i have CaCo3 powder and i do not have any idea how to work in lab??? method???

**chemistry**

the question is how to work in the lab by using these equation to get CO , i have CaCo3 powder and i do not have any idea to prepare CO

**chemistry**

how to prepare CO from this equation in the lab CaCo3 + 2HCl ? CaCl2+H2O+ CO2 (g) Or CaCo3 ----(Heat 500 to 600 C0? Cao +Co2 (g) 2- CO2 + H2 ? CO (s) + H2O(g)

**career cluster**

Damion wants to be a construction worker right out of high school and then work up to be a site foreman. He eventually wants to go to school and get his general contractor licence. Which statement best describes Damion’s thoughts? These are his goals. These are his values...

**Algebra. NEED HELP ASAP PLEASE**

So if $368 was saved in the fourth month, and $504 was saved at the twelve month, you subtract 504-368 which equals 136. Now you need to divide 136 by the remaining months, so 12-4=8, now you divide 136 by 8! Your savings rate is 17!

**Math**

"Jocelyn has 6 birds, their mean age is 10. The mode of their ages is 8. What might their ages be." I need to figure out all 6 birds' ages, but how would I be able to find the answer?

**physics**

1.115 11.5%

**Chemistry**

A volume of 5oo ml of potassium sodium tartrate solution S1 of c1=0.21mol/l is to prepared. Determine the mass of hydrated potassium sodium tartrate of formula KNaC4H4O6.4H2O needed for this preparation .(molar atomic masses : H=1;C=12;O=16;Na=23;K=39)

**Chemistry**

A volume of 5oo ml of potassium sodium tartrate solution S1 of c1=0.21mol/l is to prepared. Determine the mass of hydrated potassium sodium tartrate of formula KNaC4H4O6.4H2O needed for this preparation .(molar atomic masses : H=1;C=12;O=16;Na=23;K=39)

**Chemistry**

A volume of 5oo ml of potassium sodium tartrate solution S1 of c1=0.21mol/l is to prepared. Determine the mass of hydrated potassium sodium tartrate of formula KNaC4H4O6.4H2O needed for this preparation .(molar atomic masses : H=1;C=12;O=16;Na=23;K=39)

**Chemistry**

A volume of 5oo ml of potassium sodium tartrate solution S1 of c1=0.21mol/l is to prepared. Determine the mass of hydrated potassium sodium tartrate of formula KNaC4H4O6.4H2O needed for this preparation .(molar atomic masses : H=1;C=12;O=16;Na=23;K=39)

**Physics**

Please explicit the method for calculating the answers to b) and c).

**Physics**

How have you calculated the answer to b and c ???

**Physics**

Have you the formula? Please

**Physics**

Anonymous could you explain the formula? Please

**Physics**

fx(x)=rho_2*g*A for L/2 to L

**Physics**

Ok, thanks. No, I hav not solution for 1 and 2!

**Physics**

-0.71 mm is bad answer

**physics**

A 0.43 kg object connected to a light spring with a spring constant of 21.4 N/m oscillates on a frictionless horizontal surface. The spring is compressed 4.0 cm and released from rest. (a) Determine the maximum speed of the mass. (b) Determine the speed of the mass when the ...

**Physics**

A 0.30 kg mass is attached to a spring with a spring constant 170 N/m so that the mass is allowed to move on a horizontal frictionless surface. The mass is released from rest when the spring is compressed 0.15 m. (a) Find the force on the mass. N (b) Find its acceleration at ...

**physics**

A object-spring system undergoes simple harmonic motion with an amplitude of A. Does the total energy change if the mass is doubled but the amplitude is not changed? Do the kinetic and potential energies depend on the mass? Explain. Thanks in advance

**physic:(**

answer plz

**physic:(**

Starting at = 0 , a horizontal net force 0.280 (-0.440 is applied to a box that has an initial momentum -2.90 4.10 .

**physic:(**

Two ice skaters, Daniel (mass 70.0 ) and Rebecca (mass 45.0 ), are practicing. Daniel stops to tie his shoelace and, while at rest, is struck by Rebecca, who is moving at 14.0 before she collides with him. After the collision, Rebecca has a velocity of magnitude 8.00 at an ...

**chemistry**

how many milliliters (ml) of H2 gas will be produced at 1.0 atm and 25 Celsius all the MG reacts?

**chemistry**

He analizado antes de poder ver la solución para ver los pasos Gracias roro

**chemistry**

Consider the following reaction Al(OH)3 + 3HCL ____>ALCL3 How many milliltres of 0.8 M HCL will react with 2g of AL(OH)3 ??

**child care**

Mrs. Carroll and her sister want to keep their taxes low and keep Ms. Howard's liability to the amount of her original investment. Which type of business arrangement would be best for them

**physics**

Multiply by gravity and take the square root

**Geometry**

I am a triangle. My perimeter is 96 centimeters. Two sides are 34 centimeters and 25 centimeters and 25 centimeters. How long is my third side?

**Geometry**

I am a triangle. My perimeter is 96 centimeters. Two sides are 34 centimeters and 25 centimeters . How long is my third side?

**Geometry**

I am a triangle. My perimeter is 96 centimeters. Two sides are 34 centimeters and 25 . How long is my third side?

**math-2**

Darin counted 46 more cars than trucks in a parking lot. There were 29 trucks. Write an expression that shows how many cars were in the parking lot.

**Math**

A bike shop has 8 red, 5 blue, 12 black, and 9 white bikes. Write an expression that shows how many more black bikes than red bikes there are.

**Gil**

A bike shop has 8 red, 5 blue, 12 black, and 9 white bikes. Write an expression that shows how many more black bikes than red bikes there are.

**Chemistry**

the answer is actually B and A

**algebra**

2*12s + 2*20c + (2s + 10c) 24s + 40c + 2s + 10c 26s + 12c

**Algebra**

y= x^2 -x - 9 y=(x^2 -x + 0.5^2 - 0.5^2) -9 ; we get 0.5 by dividing 1 by 2) y=(x^2 -x + 0.25) - 0.25 -9 y=(x-0.5)^2 - 9.25

**Algebra**

when you used the calculator to find (-8)/(2)(2) you did not consider the order of operations you must multiply 2 by 2 before you divide -8 by the answer, otherwise your method is correct

**Quadratic equations- word problem**

x*y = 24 y = x - 5 so the equation becomes: x*(x - 5) = 24 expand: x^2 - 5x - 24 - 0 Factor by sum and product method: (x - 8)(x + 3) = 0 so x = 8 or x = -3 since the integers are positive, the solution is x = 8, and y = x - 5, so y = 8 - 5, y = 3 the two integers are 3 and 8

**English**

inquietude

**English**

Hi! I'm new here, but I have a quick question. I have been trying to learn how to use words figuratively. My professor gave us a list of words and we had to define them literally, figuratively and contextually. I have the literal and contextual down pat, but when it comes ...