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3 years ago

At standard pressure which substance becomes less soluble as temperature increases from 10. °c to 80.°c

1 answer:

5 0

20 At standard pressure, which substance becomes less soluble in water as temperature increases from 10.oC to 80.OC? (1) HCl (2) KCl (3)NaCl (4)NH4Cl1Use Table G, HCl is a gas and slopes down

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What is the mass of a sample of water that takes 2000 kJ of energy to boil into steam at 373 K. The latent heat of vaporization

Arte-miy333 [17]

Answer:

0.89kg

Explanation:

Q=mL L=specific latent heat

Q=energy required in J

m=mass in Kg

Q=mL

m=Q/L

m=2000000J/2.25 x 10^6 J kg-1

m=0.89kg

3 0

3 years ago

What is the complete ionic equation of Al2(SO4)3(aq) + 2K3PO4 (aq) = 2AlPO4 (s) + 3K2SO4 (aq)?

olchik [2.2K]

Answer:

$2Al^{3+} (aq) +2PO_{4}^{3-} (aq) = 2AlPO_{4} (s)$

Explanation:

1. First, you want to break up the aqueous solutions into their respective ions (remember to write the charge and number of each element). Note that you can only do this to compounds marked as aqueous, so leave the solid be.

$2Al^{3+} + 3SO_{4}^{2-} + 2K_{3}^{1+} + 2PO_{4}^{3-} = 2AlPO_{4} (s) + 3K_{2}^{1+} +3SO_{4}^{2-}$

(Technically, both Potassium ions would have a coefficient of 6. I am leaving them as they were originally just for ease)

2. Now, you want to get rid of compounds on each side that are the same. These are called spectator ions, and they are exactly as the name says: they simply "spectate" the reaction, meaning they can be removed from the complete ionic equation.

Both the sulfate and potassium ions would be considered spectator ions and would be canceled out. Once removed the equation would look like:

$2Al^{3+} (aq) +2PO_{4}^{3-} (aq) = 2AlPO_{4} (s)$

3. The complete ionic equation would be:

$2Al^{3+} (aq) +2PO_{4}^{3-} (aq) = 2AlPO_{4} (s)$

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3 years ago

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Imagine that you push on a large rock. At what point does your effort change the rock’s mechanical energy?

xz_007 [3.2K]

It changes when you have started pushing the rock because at that moment it has started moving

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4 years ago

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Questions to be ask for testing a starch

ddd [48]

I'm assuming you're asking how to test for a starch,

To do so you do this thing called the "Iodine Test"
The potassium iodide aqueous solution will form this complex with starch to form a purplish-blue color.

However, watch out for the pH as hydrolysis of starch could occur to prevent the test from working out-- and the temperature as the greater it is, the less intense the color is

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3 years ago

Como es la fórmula química del agua

dimaraw [331]

Answer:

h2o

Explanation:

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3 years ago