Is freezing water a physical or chemical change

Answers

Answer 1

Answer: Freezing water is a physical change, because it just changes the form of water, no it's chemical structure.

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Number of protons in an atom's nucleus?: _________

Answers

Answer:

The number of protons in the nucleus of an atom is its atomic number, which is unique to each element.

Explanation:

Answer:

It's the same as the atomic number e.g. Oxygen has the atomic number 8 so it has 8 protons in the nucleus.

Plz solve this i need helpprozac C17H18F3NO is a widely used antidepresent that inhibits the uptake of sertonin by the brain. how many molecules are in 3 grams of prozac?

Answers

Molar mass prozac

C17H18F3NO = 309.33 g/mol

1 mol -------------- 309.33 g
x mol -------------- 3 g

x = 3 / 309.33

x = 0.00969 mol

1 mol ------------- 6.02x10²³ molecules
0.00969 --------- y molecules

y = 0.00969 * 6.10x10²³

y = 5.83x10^21 molecules

hope this helps!.

Why must water be heated at about 80 degrees during esterification

Answers

The esters need to evaporate to be smelled.

What is the main cause for global wind patterns?A) currents in the ocean affect the air above it

B) unequal heating of different parts of earth

C) differences in elevation on different landmasses

D) greenhouse gases

(no guessing please )

Answers

B

sometimes the earths heating of the surface is unequal forming global wind patterns

How many atoms of zinc are in 6.05 moles of zinc

Answers

As we know that one mole contains 6.022 × 10²³ particles. And the number of particles are related to moles as,

# of Particles = Moles × 6.022 × 10²³ particles

In case of Zinc atoms,

# of Atoms = Moles × 6.022 × 10²³ Atoms/mol

Putting value of moles.

# of Atoms = 6.05 mol × 6.022 × 10²³ Atoms/mol

# of Atoms = 3.64 × 10²⁴ Atoms

Which of the following particles has the greatest mass? A)An alpha particle B) A Beta Particle C) A Proton D) An Electron

Answers

The answer is c) a proton

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Because water in the desert does not flow to the ocean ____________________form Select one:a. rillsb. drumlinsc. alluvian fans d. kettle lakes

How many grams of CO2 are in 2.1 mol of the compound?

20 g of sugar is stirred into a beaker containing 100 g of water. After the sugar has completely dissolved, the solution is put on a scale. What is the mass of the solution?

Smoking marijuana can be as unhealthy as smoking cigarettes and ___________a. can cause cancer.b. results in "smokers breath."c. can lead to premature aging.