When you accidentally overfill a water glass, the water takes on a dome-like or convex shape, but a half-filled water glass takes on a concave shape, in which the water is higher at the sides of the glass. This is because:Within the glass, adhesive forces dominate, and on top of the glass, cohesive forces dominate.

Within the glass, water tries to maximize its surface area, and on top of the glass, water tries to minimize its surface area.

Water's surface tension is greater inside the glass than on top of the glass.

Adhesive forces between water and the glass get weaker with height.

Answers

Answer 1

Answer:

Answer: The correct answer is within the glass, adhesive forces dominate, and on top of the glass, cohesive forces dominate.

Explanation:

Adhesive forces are defined as the molecular forces which are present between different substances. For Example: When water is poured into glass, the molecular forces between the walls of container and water molecules.

Cohesive forces are defined as the molecular forces which are present between same substances.

When water is put in the glass, two types of meniscus form, one is concave meniscus and another is convex meniscus.

Concave meniscus is formed due to adhesive forces and is dominating inside the glass.

Convex meniscus is formed due to cohesive forces and is dominating on the top of glass. As, on the top of glass no walls of glass are present. So, water molecules stick together to other water molecules.

Hence, the correct answer is within the glass, adhesive forces dominate, and on top of the glass, cohesive forces dominate.

Answer 2

Answer: The water is higher at the sides of the glass. This is because within the glass, adhesive forces dominate, and on top of the glass, cohesive forces dominate.

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Used to deliver acids and bases in a titrationa. calorimeter
b. Geiger counter
c. Burette
d. Funnel
e. Bunsen burner

Answers

c) burette

we just did a titration lab in class :)

What is the vapor pressure of the pure solvent if the vapor pressure of a solution of 10 g of sucrose (C6H12O6) in 100 g of ethanol (C2H6O) is 55 mmHg?

Answers

Answer:

56.4 mmHg

Explanation:

Given:

Vapor pressure of the solution, P solution = 55 mmHg

The mass of sucrose (C₆H₁₂O₆) = 10 g

Also, Molar mass of sucrose (C₆H₁₂O₆) = 180 g/mol

So, moles = Given mass/ molar mass

Hence, moles of sucrose in the solution = 10 g / 180 g/mol = 0.05556 mol

Given that: Mass of ethanol = 100 g

Molar mass of ethanol = 46 g/mol

Hence, moles of ethanol = 100 g / 46 g/mol = 2.174 mol

Mole fraction of solvent, ethanol is:

X ethanol = 2.174 mol / (2.174 + 0.05556) mol = 0.975

Applying Raoult's Law

P solution = X ethanol*P° ethanol

=> P° ethanol = P solution / X ethanol = 55 mmHg / 0.975 = 56.4 mm Hg

Explanation:

The given data is as follows.

Vapor pressure of the solution $(P_(solution))$ = 55 mm Hg

Mass of sucrose = 10 g

Molar mass of sucrose = 180 g/mol

Therefore, moles of sucrose present into the solution will be calculated as follows.

No. of moles = $(mass)/(molar mass)$

= $(10 g)/(180 g/mol)$

= 0.055 mol

Mass of ethanol is given as 100 g and its molar mass is 46 g/mol.

Hence, number of moles of ethanol will be calculated as follows.

No. of moles = $(mass)/(molar mass)$

= $(100 g)/(46 g)$

= 2.174 mol

As mole fraction = $(no. of moles)/(total number of moles)$

Hence, mole fraction of etahnol will be calculated as follows.

$X_(ethanol)$ = $(no. of moles)/(total number of moles)$

= $(2.174)/(2.174 + 0.055)$

= 0.975

Now, using Raoult's Law as follows.

$P_(solution) = X_(ethanol) * P_(ethanol)$

$P_(ethanol)$ = $(P_(solution))/(X_(ethanol))$

= $\frac{55 mm Hg}}{0.975}}$

= 56.4 mm Hg

Thus, we can conclude that the vapor pressure of the pure solvent is 56.4 mm Hg.

4 Which quantity represents the number of protons in an atom?(1) atomic number
(2) oxidization number
(3) number of neutrons
(4) number of valence electrons

Answers

Atomic number. That's basically the definition of atomic number.

The quantity that represents the number of proteins in an atom is the atomic number.

Why is the reaction of Iron and hydrochloric acid slow

Answers

Answer:

The chloride formed when iron reacts with hydrochloric acid is iron (II) chloride, also known as iron dichloride. The reaction between iron and hydrochloric acid is slower than the reaction with zinc, with much smaller hydrogen bubbles produced.

Answer:

The reaction of iron and hydrochloric acid is slow beacause When dilute Hydrochloric acid is added to iron filings, iron(II) chloride & hydrogen gas is produced. In this reaction iron displaces hydrogen from hydrochloric acid to form iron chloride & hydrogen gas this reaction is a single displacement reaction which reacts slowly.

Explanation:

The marathon covers 26 miles, 285 yards. Express this distance in kilometers.(1 km= 0.6214 miles, 1 inch = 2.54 centimeters)
Show calculation steps

Answers

Answer:

Conversion gives 42,107 km in total

Explanation:

A marathon covers 26 miles and 285 yards.

If 1 kilometer is 0.6214 miles, then how many kilometers are 26 miles, then:

1 km = 0.6214 miles

X = 26 miles

X = 41,841 km

Now if 1 yard is 36 inches, how many inches is 285 yards?

1 yard = 36 inches

285 yards = X

X = 10260 inches

If an inch is equal to 2.54 cm, how many centimeters are 10260 inches?

1 inch = 2.54 cm

10260 cm = X

X = 26060.4 cm

And 26060.4 cm is 0.260604 km

Finally, the sum of the distance would be:

41.841 km + 0.260604 km = 42.107 km

What is the formula mass of Al2(SO4)3?

Answers

Classic! I assume you have one of those handy-dandy reference tables, but if not look up the periodic table. The formula mass is the total mass of all the atoms in the equation, in other words it's all of the atomic masses added up together. So let's begin.
There are 2 aluminum atoms
Al- 2 atoms*27 <--- 27 is the estimated atomic mass number
S- 3 atoms*32
O-12 atoms*16
multiply that out...
Al- 54 grams +
S- 96 grams +
O- 192 grams+ now lets add everything together
__________
342 grams of Al2(SO4)3. Pretty cool?

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