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solniwko [45]
3 years ago
15

1.) What are the chemical properties of matter?

Chemistry
1 answer:
denis23 [38]3 years ago
3 0

Answer:

Chemical properties are properties that can be measured or observed only when matter undergoes a change to become an entirely different kind of matter. They include reactivity, flammability, and the ability to rust. Reactivity is the ability of matter to react chemically with other substances.

Explanation:

Your cute btw :)

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The balanced is going to be 5ch4+5o2=5co2+h20
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Select the atoms that belong to the same element
harina [27]

Answer:Top Right and Bottom Right.

Explanation:

Proton's define an elements Identity

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Dax has been learning about chemical reactions, and he now understands that chemical reactions occur at different rates. Some ar
patriot [66]

Answer:

  • concentration
  • temperature
  • surface area (for solid reactants ONLY)
  • pressure (for gaseous reactants ONLY)
  • catalyst

Explanation:

  • Concentration- rate of the reaction increases with the increase of concentration of the reactants. More particles per unit volume leads to the frequency of collisions to increase. The number of successful collisions thereby increase and overall, lesser time is needed to complete the reaction (upon a higher concentration)
  • Temperature- With the increase of temperature, rate of reaction increases. Particles have more kinetic energy and they move faster. Due to this, number of successful collisions increases/number of effective collisions increases. More particles have energy greater than the activation energy and, activation energy can't change. If number of moles are changed, then number of product will vary.
  • Surface Area- Rate of reaction increases with the increase of surface area of the solid reactant. More particles are exposed to react and the frequency of collisions increases. Less time is needed to complete the reaction and with the decrease of size, surface area increases.
  • Pressure- Rate of reaction increases with the increase of pressure of the gaseous reactants. Gas molecules are closer/ more particles per unit volume is found. The frequency of collisions increase and number of effective collisions increases.
  • Catalyst- Substances which can speed up a chemical reaction by lowering the activation energy by creating an alternative route are called catalysts. They take part in a chemical reaction but after the reaction, they remains chemically unchanged. Catalysts can change the value of enthalpy change and increases both forward and backward reaction rates. They can't change the yield of a chemical reaction and can't change the equilibrium composition. (ex: usage of Vanadium (V) Oxide to manufacture sulfuric acid).
7 0
3 years ago
2) Show the calculation of Kc for the following reaction if an initial reaction mixture of 0.800 mole of CO and 2.40 mole of H2
nadezda [96]

Answer:

Kc = 3.90

Explanation:

CO reacts with H_2 to form CH_4 and H_2O. balanced reaction is:

CO(g) + 3H_2 (g) \leftrightharpoons CH_4(g)  +  H_2O(g)

No. of moles of CO = 0.800 mol

No. of moles of H_2 = 2.40 mol

Volume = 8.00 L

Concentration = \frac{Moles}{Volume\ in\ L}

Concentration of CO = \frac{0.800}{8.00} = 0.100\ mol/L

Concentration of H_2 = \frac{2.40}{8.00} = 0.300\ mol/L

                 CO(g) + 3H_2 (g) \leftrightharpoons CH_4(g)  +  H_2O(g)

Initial            0.100      0.300             0   0

equi.            0.100 -x    0.300 - 3x     x    x

It is given that,

at equilibrium H_2O (x) = 0.309/8.00 = 0.0386 M

So, at equilibrium CO = 0.100 - 0.0386 = 0.0614 M

At equilibrium H_2 = 0.300 - 0.0386 × 3 = 0.184 M

At equilibrium CH_4 = 0.0386 M

Kc=\frac{[H_2O][CH_4]}{[CO][H_2]^3}

Kc=\frac{0.0386 \times 0.0386}{(0.184)^3 \times 0.0614} =3.90

8 0
4 years ago
One of the essential minerals in the human body is salt. How much salt (NaCl) is in the average adult human body?
nlexa [21]
No! If it was 12% a 150 pound person would be about 18 pounds of salt!

~0.4%
The average 150lb person would contain ~280 g of NaCl.
6 0
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