PHYSICS HIGH SCHOOL

Which of the following solutes dissolved in 1000g of water would provide the fewest number of particles?A) 1000 g of glucose (C6H12O6)
B) 1000 g of sodium chloride (NaCl)
C) 1000 g of calcium carbonate (CaCO3)
D) 1000 g of potassium sulfate (K2SO4)

Answers

Answer 1
Answer:

Answer:

Option A

Explanation:

The number of particles a solute provides in a solution depends on its chemical formula and how it dissociates or ionizes in water.

A) 1000 g of glucose (C6H12O6) does not ionize or dissociate in water, so it remains as individual molecules. Therefore, it provides the fewest particles since it's composed of only C, H, and O atoms.

B) 1000 g of sodium chloride (NaCl) dissociates into two ions (Na⁺ and Cl⁻) in water, so it provides two particles per formula unit.

C) 1000 g of calcium carbonate (CaCO3) can dissociate into three ions (Ca²⁺, CO₃²⁻) in water, so it provides three particles per formula unit.

D) 1000 g of potassium sulfate (K2SO4) can dissociate into three ions (2K⁺ and SO₄²⁻) in water, so it also provides three particles per formula unit.

So, option A, 1000 g of glucose (C6H12O6), provides the fewest number of particles because it doesn't dissociate or ionize in water.

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A rock at the edge of a 200-m high cliff has more potential energy than an equal sized rock at the edge of a 600-m high cliff. True or False

Answers

Answer: The given statement is False.

Explanation:

Potential energy is defined as the energy possessed due to the height of the object.

Mathematically,

E_p=mgh

where,

E_p = potential energy of the rock

m = mass of the rock

g = acceleration due to gravity = 9.8m/s^2

h = height of the cliff from where the rock is thrown

  • When height of the cliff is 200 m

Putting values in above equation, we get:

E_p=m* 9.8* 200m\n\nE_p=1960m

  • When height of the cliff is 600 m

Putting values in above equation, we get:

E_p=m* 9.8* 600m\n\nE_p=5880m

So, E_p(60m)>E_p(200m)

Potential energy of the rock at 600-m high cliff is more than the potential energy of the rock at 200-m high cliff

Hence, the given statement is False.
It is false. The higher an object is the more potential energy they have.

(x - 4)2 = 36 Which of the following expressions represents the solutions to the given equation?

Answers

X = 22 is what I think.

A device that does work with one movement and changes the size or direction of a force is a(n)

Answers

A device that does work with one movement and changes the size or direction of a force is a simple machine.

Answer:

it is a simple machine

Explanation:

The Earlybird communications satellite hovers over the same point on Earth's equator indefinitely. This is because _____. A. its orbital period is 24 hours B. it is beyond the main pull of gravity C. it pulls as hard on Earth as Earth pulls on it D. it is kept aloft by ground control E. forces other than Earth's gravity act on it

Answers

A. its orbital period is 24
The Earlybird ... and every TV satellite ... hovers over the same point
on Earth's equator indefinitely because its orbit is continually adjusted
to ...

-- be in the plane of the equator,

-- be as perfectly circular as possible,

-- have a period exactly equal to the Earth's rotation period ...
about 23 hours 56 minutes 4 seconds, not 24 hours. 

What is your rate in miles/hour if you tun at a speed of 2.2 miles in 20 minutes

Answers

you need to convert minutes to hours so 
(2.2 mi)/(20 min) x (60 min)/(1 hr) = (6.6 mi)/(1 hr)

Q: How do flies walk on ceilings without falling

Answers