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3 years ago

What type of change is sugar dissolving in water physical or chemical

Chemistry

1 answer:

Hunter-Best [27]3 years ago

3 0

Answer:

Physical

Explanation:

No new substance is formed.

The process can be reversed using evaporation to separate the sugar from the water

So the change is physical

Hope this helps :)

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What is the mass percentage of C in caffeine, C₈H₁₀N₄O₂? Provide an answer to two decimal places.

mina [271]

Answer:

46.8% should be. correct, I'm not fully sure though. : )

8 0

2 years ago

Pure titanium metal is produced by reaction titanium(IV) chloride with magnesium metal. The equation for the reaction is: TiCl4(

qaws [65]

Answer:

The answer to your question is 1.013 Kg

Explanation:

TiCl₄ + 2Mg ⇒ 2MgCl₂ + Ti

mass of Mg = ?

mass of Ti = 1 kg

Process

1.- Calculate the molar mass of Magnesium and titanium (IV)

Mg = 24.3 g x 2 = 48.6 g

Ti = 48 g

2.- Write a proportion (rule of three)

48.6 g of Mg ------------- 48 g of Ti

x ------------- 1000 g of Ti

x = (1000 x 48.6) / 48

3.- Result

mass of Magnesium = 1012.5g

= 1.013 kg

7 0

3 years ago

What physical and chemical properties would an antique dealer use to determine the substance that makes up a

Alja [10]

Answer:

Characteristics such as melting point, boiling point, density, solubility, color, odor, etc. are physical properties. Properties that describe how a substance changes identity to produce a new substance are chemical properties. ... Physical and chemical properties can be used to classify a substance as ionic or molecular.

8 0

2 years ago

The pH of a 0.29 M solution of carbonic acid (H2CO3) is measured to be 3.44. Calculate the acid dissociation constant Ka of carb

arsen [322]

Answer: 4.55x10^-7

Explanation:

H2CO3 + H20 <==> H3O+ + HCO3-

Desigining an ICE table, we have:

Initial conc. of H2CO3 = 0.29 M

Initial conc. of H3O+ = 0

Initial conc. of HCO3- = 0

Change in conc. of H2CO3 = - x

Change in conc. of H3O+ = x

Change in conc. of HCO3- = x

Equilibrium conc. of H2CO3 = 0.29 - x

Equilibrium conc. of H3O+ = x

Equilibrium conc. of HCO3- = x

but pH = 3.44

pH = - log[H30+]

[H30+] = 10^-3.44 = 3.63x10^-4

[H30+] = 3.63x10^-4

Ka = [H3O+].[HCO3-] / [H2CO3]

[H30+] = x = 3.63x10^-4

[HCO3-] = 3.63x10^-4

[H2CO3] = 0.29 - x = 0.29 - 3.63x10^-4 = 0.289637

Ka = (3.63x10^-4)(3.63x10^-4)/0.289637 = 4.55x10^-7

6 0

3 years ago

The ph of coffee is 5.6. The ph of grapefruit juice is 2.6. This means that the proton concentration in coffee is

Brrunno [24]

pH scale is used to measure the acidity or alkalinity on a scale of 0-14 where 0-6.9 is the acidic region , 7.1-14 is the basic region and 7 is for the neutral substance. We can calculate the concentration of proton from pH.

$pH=-log[H^+]$