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Stella [2.4K]
3 years ago
12

Can anyone help me please

Chemistry
2 answers:
JulijaS [17]3 years ago
5 0

Matter either loses or absorbs energy when it changes from one state to another.

antiseptic1488 [7]3 years ago
3 0

Answer: Matter either loses or absorbs energy when it changes from one state to another.

Explanation: "For example, when matter changes from a liquid to a solid, it loses energy. The opposite happens when matter changes from a solid to a liquid. ... The amount of energy in matter can be measured with a thermometer."

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How many millibars are equal to 27:23 inches of mercury. How did you get you answer
Nady [450]

the correct answer is.. ill tell you when i search it up gimme 2 seconds


4 0
3 years ago
What is the percent of oxygen by mass in a pure sample of fecr2o4? 1. 52% 2. 13% 3. 37% 4. 7.1% 5. 29%?
Marta_Voda [28]
Let us suppose that we have 1 mol of FeCr2O4. I'm going to use approximate masses because I have no idea what your periodic table will say. Just put in the exact masses from your periodic table.

Fe = 56
Cr*2 = 2*52 = 104
O4 = 4*16 = 64
===========
Total = 56 + 104 + 64 = 224
The % oxygen = (64 / 224) * 100 = 28.5 % but none of your answers match this. Perhaps you are talking about Fe2(Cr2O4)3 The brackets make all the difference in the world.

Without going through all the detail I did before, The molecular mass is
Fe * 2 = 112
Cr * 6 = 312
O * 12 = 192
The total molecular mass = 616

The % Oxygen = (192 / 616) * 100 = 31% roughly. That answer isn't there either. 

Let's wait and see who else answers.

6 0
3 years ago
Atomic mass represents the number of:<br> rotons<br> neutrons<br> electrons<br> protons and neutrons
Pavlova-9 [17]

Answer:

Proton Atomic Mass = 1

Neutron = 1

Electron = 0.0005

8 0
3 years ago
A ballerina weighs 103 lbs and is up on her toes with only 10.0 cm2 of her slippers in contact with the floor. What pressure is
Ahat [919]

Answer:

A

Explanation:

1 lb = .453 kg...so...103 x .453 = 46.72 kg  

you then multiply that by the force of gravity which is 9.8(m/s2)...so...  

46.72 x 9.8 = 458 newtons(kg x m/s^2), which is the force.  

pressure (in pascals) = Force(N) / Area (m2)  

we need to convert 10cm2 to m2 which = .001m^2  

458 / .001 = 458000 = 4.58 x 10^5 Pa

8 0
3 years ago
Read 2 more answers
Calculate the number of molecules of hydrogen and carbon present in 4g of methane
DIA [1.3K]

Molar Mass of 1 molecule of methane(CH4) = 12 + 4 = 16g/mol

That is, 16g if CH4 contain 1 mole molecule of it

= 6.022×10²³ molecules of CH4 which consists of 1 mole of C atoms and 4 moles of H atoms.

=> 4 g of CH4 contains 1/4 × 6.022×10²³ molecules

= 1.5055×10²³ molecules of CH4

= 1.5055×10²³ C atoms and 6.022×10²³ H atoms

Note: the question should be how many atoms of hydrogen and carbon and not molecules.

Hope it helps…

7 0
2 years ago
Read 2 more answers
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