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Answer:

2

Explanation:

Ed. 2020

3 Ca3 (PO4)2 + 4 CaO

So we can see that there are 3 Ca3 (Ca3, Ca3, Ca3), which means you multiply the subscript by the coefficient, meaning 9 Ca. Then we see (PO4)2, which means that there are two PO4 (PO4, PO4) so we multiply the subscript 2 by the subscript 4 on O to equal 8 O, and we multiply the subscript 2 by the subscript 1 on P (the 1 is not written) to equal 2 P.

So far we have 9 Ca, 8 O, and 2 P.

One last term, 4 CaO (means CaO, CaO, CaO, CaO) which translates to 4 Ca and 4 O.

Add them all together and you get (9+4=13) 13 Ca, (8+4=12) 12 O, and 2 P

Answer:

7.56°C is the temperature when the gas occupies 400cm³

Explanation:

Based on Charles's law, the volume of a gas is directly proportional to its absolute temperature under constant pressure. The equation is:

V₁T₂ = V₂T₁

Where V is volume and T is absolute temperature of 1, initial state and 2, final state of the gas.

Computing the values:

V₁ = 560cm³

T₂ = ?

V₂ = 400cm³

T₁ = 120°C + 273.15 = 393.15K

560cm³*T₂ = 400cm³*393.15K

T₂ = 280.71K - 273.15 =

Answer: I can suck you di ck

Explanation:

Answer:

Oil spills

Explanation:

I've done it before

Answer:

2C2H6 + 7O2 --> 4CO2 + 6H20

Explanation:

Balanced equation

Answer:

Explanation:

The reaction is:

C₃H₈ + 5O₂  →  3CO₂  +  4H₂O

We see, that the equation is ballanced.

As we have data from only one reactant, we assume the other is in excess.

Ratio is 1:4 (stoichiometry). We solve this, by a rule of three:

1 mol of propane can produce 4 moles of water

Then, 4 moles of propane, may produce

( 4 . 4 ) /1 = 16 moles of water can be made.

Remember, we always have to work with the limiting reactant.

Answer:

The liquid form of water starts to become solid (ice) at this temperature.

Answer:

H 2 O

Explanation:

H 2 O can act as a Brønsted-Lowry acid by donating a proton to produce its conjugate base OH - (known as the hydroxide ion). H 2 O can act as a Brønsted-Lowry base by accepting a proton to produce its conjugate acid H 3 O + (known as the oxidanium ion, or oxonium ion, or, in older textbooks as the hydronium ion (5)).

Answer:

false

Explanation:

Answer:

mole=mass/molarmass

Explanation:

molar mass of h2o=18

Answer: Chemical

Explanation:

Answer:

Ah I think it's Chemical

Explanation:

Maybe, because it wasn't just move onto something, it changed it.

Answer:

Explanation:

16. 12

17. 8

18. 9

19. 10

20. 5

21. 15

22.8

23. 24

24. 12

25. 3 i guess( some one comment for 25th pls)

26. 2

Air pollution must affect lichen growth because lichens have no roots they get all their nutrients from the air. If the air has pollutants that can become toxic for lichens.

A lichen can be described as a composite organism that arises from algae or cyanobacteria living among filaments of fungi species in a mutualistic relationship. Lichens have different properties that come in many colors, sizes, and forms.

A macro lichen can be defined as a lichen that is either bush-like or leafy.  Lichens do not have roots therefore they absorb water and nutrients as plants do  but like plants, they form their own nutrition by photosynthesis.

If lichens are exposed to air pollutants they are unable to avoid the accumulation of air pollutants. Because lichens possess no roots, their primary source of most nutrients is the air.

Lichen decline can be because of the accumulation of toxic substances as well as altered nutrient supplies that favor one symbiont over the other. Therefore, option (A) is correct.

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Answer:

Do you need 3 ways or just one?

1. Temperature.

2. Pressure.

3. Polarity.

Explanation:

Eh hope these help, Idr understand the question but those are 3 ways to increase the solubility of a solid in water.

Answer:

B

Explanation:

Trust me I've had problems like these

Robert Boyle established chemistry as a discipline based on measurement, freeing it from the mysticism and alchemy that had plagued it. He introduced the concept of chemical analysis and defined elements, compounds, and mixes.

Boyle used a vacuum chamber to alter the gas's pressure in order to find the link between pressure and volume in a gas, which is now known as Boyle's law. In order to demonstrate that pressure and volume are inversely related to one another, he made detailed observations and carried out a number of experiments.

He developed a new vacuum pump and performed experiments in vacuum, they found that neither sound nor flame could exist there.

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Answer:

C

Explanation:

The answer is C because only that amount can move

Answer:

Solid, Naturally Occurring, Inorganic, Fixed Composition, Crystal-like internal structure

Explanation:

Answer:

The moon is closer to earth

Explanation:

Around each new moon and full moon, the sun, Earth, and moon arrange themselves more or less along a line in space. Then the pull on the tides increases, because the gravity of the sun reinforces the moon's gravity. ... Thus, at new moon or full moon, the tide's range is at its maximum.

Answer:

Ionic bond

Explanation:

Covalent bonds can only form between non-metals and copper is a metal so it would be an ionic bond.

CuO (copper(II) oxide) is a compound with a covalent bond. The electronegativity difference is less than 1.7, which would make it a covalent bond.

In a covalent bond, atoms share electrons to form a stable molecule. The electronegativity difference between copper (Cu) and oxygen (O) is less than 1.7, indicating a nonpolar covalent bond. This means that the electrons in the bond are shared relatively equally between the copper and oxygen atoms, resulting in a molecule with a low degree of polarity.

Copper is a transition metal with an electronegativity of around 1.9, and oxygen has an electronegativity of approximately 3.44. The electronegativity difference (3.44 - 1.9 = 1.54) is less than 1.7, confirming that the bond between copper and oxygen is covalent rather than ionic.

In ionic bonds, the electronegativity difference is typically larger than 1.7, leading to a transfer of electrons from one atom to another, resulting in the formation of ions. Since the electronegativity difference in CuO is less than 1.7, it is considered a covalent bond.

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Answer:

false

Explanation:

This statement is false because plants release waste material, like oxygen, through small holes in the plants leaves.

Answer:

c

Explanation:

but I'm not 100 percent sure.

Answer:

purifying copper to produce copper wiring for homes

Explanation:

Answer:

b.purifying copper to produce copper wiring for homes

Explanation: