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sashaice [31]
3 years ago
14

Whitch of the following are physical changes ?

Chemistry
2 answers:
Reika [66]3 years ago
7 0

Answer:

melting boiling frezzing

Explanation:

mamaluj [8]3 years ago
4 0

Answer:

melting, freezing, and boiling are physical changes

Explanation:rusting and souring are ex. of chemical, not physical

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An analysis of a sugar compound is found to contain 132 grams of carbon (C), 22 grams of hydrogen (H), and 176 grams of oxygen (
ddd [48]
132 g of C  ,   22 g of H   , 176 g of O

132 + 22 + 176 => 330 g <span>of the substance

</span>Now convert the masses in <span>moles :
</span>
C = 12.0 u        H = 1.0 u       O = 16.0 u

C = 132 / 12.0 => 11 moles

H = 22 / 1.0 => 22 moles

O = 176 / 16.0 => 11 moles

Using the values obtained the lowest proportion in mols of elements present, simply divide the values found for the least of them<span>:
</span>
C = 11 / 11 => 1

H = 22 / 11 => 2

O = 11 / 11 => 1

 formula empirically <span>is : CH</span>₂O

hope this helps!


8 0
4 years ago
Give me three reasons why iodine isn't soluble in water.<br><br> Thanks a lot !
inn [45]

Answer:

Because Iodine is a non-polar but water is polar therefore it can not have a hydrogen bond or any permanent dipole-dipole interactions

8 0
3 years ago
How are most meteoroids formed? A. As the Sun burns, it throws off small, solid particles at a regular rate which are launched i
Nutka1998 [239]

Answer:

It is no. D

Explanation:

Many meteoroids are formed from the collision of asteroids, which orbit the sun between the paths of Mars and Jupiter in a region called the asteroid belt.

6 0
4 years ago
What is the chemical formula of magnesium bromide? A. MgBr2 B. MgBr C. Mg2Br2 D. Mg2Br
DanielleElmas [232]
A. MgBr2
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7 0
3 years ago
I'm looking at the barometer in my lab as I type this question. It says the pressure is 968 torr. What is this pressure expresse
Ksenya-84 [330]

Answer:

1.27 atm.

Explanation:

The following data were obtained from the question:

Pressure (P) in torr = 968 torr

Pressure (P) in atm =...?

Thus, we can convert from torr to atm by doing the following:

Recall:

760 torr = 1 atm

Therefore,

968 torr = 968/760 = 1.27 atm

Therefore, 968 torr is equivalent to 1.27 atm.

7 0
4 years ago
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