CHEMISTRY MIDDLE SCHOOL

Which one of this is endothermic and which one is exothermic?CH2+O2 -> CO2+H2O+Energy
CaCo+Energy -> CaCo+CO2

Answers

Answer 1
Answer: The first one is exothermic because energy is a reactant, the second formula is endothermic

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How do octopus use Newton's third law of motion to escape from enemies

A 20 N force is applied to an object with a mass of 100 kg. What is theacceleration of the object?
O
O
A. 0.2 m/s2
B. 120 m/s. 120 m/s2
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C. 80 m/s. 120 m/s2
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Answers

Answer:

A. .2 M/s2

Explanation:

Force = mass x acceleration

The force is given as 20 N and tthe mass as 100kg

Solve for accelartion as 20/100 = .2

(Also wrong subject this is a Physics problem)

Answer:

The answer is 0.2m/s^2

Explanation:

As we all know that, Force=Mass* Acceleration

So, to make acceleration the subject of the formular, we have Acceleration=Force/mass

And we were given that, Force=20N

Mass=100kg

So, Acceleration= 20/100

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What are genes carbohydrates,lipids,porteins or nucleic

Answers

Answer:

i think it is nucleic

Explanation:

because that is what i think

What amount in moles does 242 L of carbon dioxide occupy at 1.32 atm and 20 degrees C

Answers

Answer:

13.28 mol.

Explanation:

  • We can use the general law of ideal gas: PV = nRT.

where, P is the pressure of the gas in atm (P = 1.32 atm).

V is the volume of the gas in L (V = 242.0 L).

n is the no. of moles of the gas in mol (n = ??? mol).

R is the general gas constant (R = 0.0821 L.atm/mol.K).

T is the temperature of the gas in K (T = 20.0° + 273 = 293.0 K).

∴ n = PV/RT = (1.32 atm)(242.0 L)/(0.0821 L.atm/mol.K)(293.0 K) = 13.28 mol.

Summarize: How are matter and substances related?

Answers

All substances are matter but all matters are not substance. Matter is generally a loose term used in respect to a substance. Matter and substance are sometimes used for the same context, this is certainly not correct. Various examples have already proved that a matter will not always be a substance depending on its physical nature, but a substance is always a matter.

(cc/ to Taskmasters , I just switched it up a little bit.)

Why does the density of a substance remain the same for different amounts of the substance?

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Density represents mass per volume and so when homogeneous and incompressible, an amount increase/decrease does not affect density, as the mass and volume change in the same amount. Hope this helps!

Which describes the polarity in a water molecule?

Answers

Answer:

The oxygen atom in a water molecule is strongly electronegative. The atoms of the water molecule are held together by covalent bonds. water has nonpolar bonds, but it has a bent shape and is therefore polar.
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