CHEMISTRY MIDDLE SCHOOL

a toothpick, pencil, and log are all the same type of wood. explain which would be most dense. answer

Answers

Answer 1
Answer:

Explanation:

Density is defined as the mass of a substance present in per unit volume.

Mathematically,         Density = (mass)/(volume)

As toothpick, pencil and log are all made up of same wood. So, this means that there will be same composition as amount of mass present in per unit volume will be the same.

Therefore, we can conclude that toothpick, pencil and log all of them will have same density.
Answer 2
Answer: They are all equally dense because they are made of the same material with the same molecular composition.

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if 20.0g of N2 gas has a volume of 0.40L and a pressure of 6.0atm, what is the temperature in degrees celsius?

Answers

Answer:

-232 °C

Explanation:

We can use the Ideal Gas Law and solve for T.

pV = nRT

Data:  

m = 20.0 g

p = 6.0 atm

V = 0.40 L

R = 0.082 06 L·atm·K⁻¹mol⁻¹

Calculations:

1. Moles of N₂

\text{n} = \text{20.0 g} * \frac{\text{1 mol}}{\text{28.01 g}} = \text{0.7140 mol}

2. Temperature of N₂

\begin{array} {rcl}pV & = & nRT\n\text{6.0 atm} * \text{0.40 L} & = & \rm\text{0.7140 mol} * 0.08206 \text{ L}\cdot\text{atm}\cdot\text{K}^(-1)\text{mol}^(-1) * T\n2.40&=&0.05859T\text{ K}^(-1)\nT& =& \frac{2.40 }{0.05859\text{ K}^(-1)}\n\n & = & \text{41.0 K}\end{array}

3. Convert the temperature to Celsius

T = (41.0 - 273.15) °C = -232 °C

explain the difference of valence electron behavior between ionic bonds and covalent bonds. Give an example of each type of bond using the three main groups from the periodic table.

Answers

Ionic bonds are typically weak, non-directional primary bonds between atoms, where one cation donates its valence electrons to one or more anions. They often occur between a metal and a non-metal such as table salt (NaCl). Materials made from ionic bonds tend to be more ductile than covalent ones but are still more brittle than metallic bonded ones.
Covalent bonding is a strong type of primary bond that is highly directional as the atoms share their valence electrons. This makes the material less ductile. An example of this is carbon-carbon bonds in diamond.

What is happening within the system when it is at equilibrium in terms of concentration, reactions that occur, and reaction rates? 2CH4(g) <--> C2H2(g) + 3H2(g)

Answers

Answer and Explanation:

It is worthy to be mentioned that the equilibrium in this reaction is dynamic equilibrium.

  1. In terms of concentration: the concentration of reactants (CH4) and products (C2H2 & H2) do not change and be constant at the equilibrium, that 2 moles of CH4 give one mole of C2H2 and 3 moles of H2.
  2. In terms of reactions that occur: the reactions that occur at the equilibrium are the forward and the reverse reaction. The forward reaction: 2CH4 → C2H2 + 3H2 and the reverse reaction: C2H2 + 3H2 → 2CH4.
  3. In terms of reaction rates: At equilibrium the rate of the forward reaction is equal to the rate of the reverse reaction.

Answer:

In a chemical reaction equilibrium is in the state which reacts with both products and reactants.  Both reverse and forward are happening and both reaction rates forward and reverse are equal.  

Explanation:

This is what i put and i got it right.

How is weathering related to the geologic cycle

Answers

Weathering is the breaking down of rocks, soil and minerals as well as artificial materials through contact with the Earth's atmosphere, biota and waters.

Easy Question! Chemistry - Please help! I give thanks - It's the picture - Question 4

Answers

The key to answering this question is to realize that you have two polyhedrons combined to form one thus the overall volume would be equal to the sum of the two polyhedron.

Total volume= (volume of prism) + (volume of cuboid)

a) Volume of cuboid (V_(1))= l * w * h
      l   = 13ft
      w = 18ft
      h =  21ft
: . V_(1) = 13ft * 18 ft * 21ft
                              = 4914ft ^(3)

b) Volume of Prism (V_(2)) =  (1)/(2) * b * h * H
      b  = 18ft
      h  = 16ft
      H = 13ft
: . V_(2)= (1)/(2) * 18ft * 16ft * 13ft
                              = 1872ft^(3)

Thus Overall Volume = 6786ft^(3)
    

How to find wavelength

Answers

Know the formula for calculating wavelength. To find the wavelength of a wave, you just have to divide the wave's speed by its frequency. ...State the formula in correct units. ...Plug the known quantities in the equation. ...Solve.

Answer:

Use the formula v=fλ Divide the velocity by the frequency to find the wavelength. (Make sure you add the unit λ for your final answer)

V: Velocity

F: Frequency

λ: Wavelength
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