Unsorted sands have a lower porosity. True O False

How are cells the basic units to all organisms??

Nonamiya [84]

Answer:

Cells as Building Blocks

A cell is the smallest unit of a living thing. A living thing, whether made of one cell (like bacteria) or many cells (like a human), is called an organism. Thus, cells are the basic building blocks of all organisms. ... Several systems that function together form an organism (like a human being).

5 0

3 years ago

Is carbon monoxide covalent or ionic?

Talja [164]

Covalent since they are both non metals, a metal and a non metal make an ionic bond

7 0

3 years ago

After examining the graphs, the scientist could

Ivanshal [37]

4
They need more oxygen due to higher temperatures

5 0

3 years ago

A quantity of 8.10 × 102 mL of 0.600 M HNO3 is mixed with 8.10 × 102 mL of 0.300 M Ba(OH)2 in a constant-pressure calorimeter of

victus00 [196]

Answer:

22.48°C is the final temperature of the solution.

Explanation:

Heat of neutralization of reaction , when 1 mol of nitric acid reacts= ΔH= -56.2 kJ/mol= -56200 J/mol

$Moles (n)=Molarity(M)\times Volume (L)$

Moles of nitric acid = n

Volume of nitric acid solution = $8.10\times 10^2 mL= 0.81L$

Molarity of the nitric acid = 0.600 M

$n=0.600 M\times 0.81 L=0.486 mol$

Moles of barium hydroxide = n'

Volume of barium hydroxide solution = $8.10\times 10^2 mL= 0.81L$

Molarity of the barium hydroxide= 0.300 M

$n'=0.300 M\times 0.81 L=0.243 mol$

$2HNO_3+Ba(OH)_2\rightarrow Ba(NO_3)_3+2H_2O$

According to reaction, 2 mol of nitric acid reacts with 1 mol of barium hydroxide .Then 0.486 mol of nitric acid will react with :

$\frac{1}{2}\times 0.486 mol=0.243 mol$ barium hydroxide.

Heat release when 0.486 mol of nitric acid reacted = Q

= ΔH × 0.486 = -56200 J/mol × 0.486 mol=-27,313.2 J

Heat absorbed by the mixture after reaction = Q' = -Q = 27,313.2 J

Volume of the nitric solution = 0.81 L = 810 mL

Volume of the ferric nitrate solution = 0.81 L = 810 mL

Total volume of the solution = 810 mL + 810 mL = 1620 mL

Mass of the final solution = m

Density of water = density of the final solution = d = 1 g/mL

$Mass=density\times Volume$

$m=1 g/ml\times 1620 ml=1620 g$

Initial temperature of the both solution were same = $T_1=18.46^oC$

Final temperature of the both solution will also be same after mixing= $T_2$

Heat capacity of the mixture = c = 4.184 J/g°C

Change in temperature of the mixture = ΔT = $(T_2-T_1)$

$Q=mc\Delta T=mc(T_2-T_1)$

$27,313.2 J= 1620 g\times 4.184 J/g^oC\times (T_2-18.46^oC)$

$T_2=22.49^oC$

22.48°C is the final temperature of the solution.

8 0

3 years ago

When will the net enthalpy of formation of a solution (δhsolution) be endothermic?

Gre4nikov [31]

Answer is: it can be endothermic when the amount of energy needed to break the intermolecular forces in the solute is larger than the amount of energy given off by formation of intermolecular forces in the mixture, so solution must be heated.
In ideal solution the forces of attraction between the solute-solute and the solvent-solvent and solute-solvent molecules are the same.

3 0

3 years ago