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2 years ago

Which is the best description of Darwin’s theory of evolution?

Chemistry

2 answers:

Leokris [45]2 years ago

5 0

Answer:

Explanation:

cfy.uhy.lobhyu444444444,.....xres;iiiiiiiiiiiuxoppppuuusxijnnhsxdrcfvtgbyhnuj

Anastaziya [24]2 years ago

5 0

Answer:

Explanation:

stop answering people questions and not actually helping them typing random stuff like i just did here

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The chemical mixture that composes our atmosphere is called ________.

Virty [35]

Answer: Air

Hope this helps

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3 years ago

Who's your celebrity crush and why?

dezoksy [38]

Answer:

Ian Somerhalder because he's JUST SO fine

Explanation:

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2 years ago

Read 2 more answers

Perform the following mathematical operation and report the answer to the correct number of significant figures? ( I have watche

professor190 [17]

0.008 ÷ 51.3 = 0.0002

Sig Figs

0.0002

Decimals

0.0002

Scientific Notation

2 × 10-4

E-Notation

2e-4

Words

zero point zero zero zero two

I HOPE I HELP

7 0

2 years ago

What do you think is responsible for the color produced in the flame, the metal atom or what is attached to the metal atom?

zlopas [31]

Answer:

metal Atom

Explanation:

every transition metal atom are responsible for the flame color. Some metal are also confirmed by flame test.

7 0

3 years ago

What is the total energy change for the following reaction:CO+H2O-CO2+H2

Alekssandra [29.7K]

Answer:

$\large \boxed{\text{-41.2 kJ/mol}}$

Explanation:

Balanced equation: CO(g) + H₂O(g) ⟶ CO₂(g) + H₂(g)

We can calculate the enthalpy change of a reaction by using the enthalpies of formation of reactants and products

$\Delta_{\text{rxn}}H^{\circ} = \sum \left( \Delta_{\text{f}} H^{\circ} \text{products}\right) - \sum \left (\Delta_{\text{f}}H^{\circ} \text{reactants} \right)$

(a) Enthalpies of formation of reactants and products

$\begin{array}{cc}\textbf{Substance} & \textbf{$\Delta_{\text{f}}$H/(kJ/mol}) \\\text{CO(g)} & -110.5 \\\text{H$_{2}$O} & -241.8\\\text{CO$_{2}$(g)} & -393.5 \\\text{H$_{2}$(g)} & 0 \\\end{array}$

(b) Total enthalpies of reactants and products

$\begin{array}{ccr}\textbf{Substance} & \textbf{Contribution)/(kJ/mol})&\textbf{Sum} \\\text{CO(g)} & -110.5& -110.5 \\\text{H$_{2}$O(g)} &-241.8& -241.8\\\textbf{Total}&\textbf{for reactants} &\mathbf{ -352.3}\\&&\\\text{CO}_{2}(g) & -393.5&-393.5 \\\text{H}_{2} & 0 & 0\\\textbf{Total}&\textbf{for products} & \mathbf{-393.5}\end{array}$

(c) Enthalpy of reaction $\Delta_{\text{rxn}}H^{\circ} = \sum \left( \Delta_{\text{f}} H^{\circ} \text{products}\right) - \sum \left (\Delta_{\text{f}}H^{\circ} \text{reactants} \right)= \text{-393.5 kJ/mol - (-352.3 kJ/mol}\\= \text{-393.5 kJ/mol + 352.3 kJ/mol} = \textbf{-41.2 kJ/mol}\\ \text{The total enthalpy change is $\large \boxed{\textbf{-41.2 kJ/mol}}$}$

4 0

2 years ago