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2 years ago

32. Calculate the pH of a solution at 1.00 x 10- MIH") and identify the substance as an acid or base,

Chemistry

1 answer:

Gre4nikov [31]2 years ago

8 0

Answer:

${ \boxed{ \tt{formular : pH = - log[H {}^{ + } ]}}} \\ pH = - log(1.00 \times {10}^{-6} ) = 6: it's an acid\\ since \: we \: lack \: the \: exponent, \: this \: question \: is \: unsolvable \\ { \green{ \bf{take \: note}}} :{ \tt{pH \: below \: 7 \: that \: is \: { \red{acidic}}. \: \: pH \: greater \: than \: 7 \: is \: { \red {basic}}}}$

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Rebecca is playing a video game that involves planting and cutting down trees. She moves up an energy level for each tree she pl

kipiarov [429]

Answer:

she ends at level 5 after her 3 turns

Explanation:

Rebecca starts at level 4 if she cuts down 6 trees for her next turn she loses 6 levels we can rewrite this as -6 so 4 + (-6) = -2 her next turn is planting 8 trees so she goes up 8 levels -2 + 8 = 6 her last turn she cuts down one tree

6 + (-1) = 5

altogether 4 + (-6) + 8 + (-1) = 5

8 0

1 year ago

Which of the following does NOT show the law of conservation of mass?

algol [13]

I think the correct answer from the choices listed above is option B. <span>24 mL of Mg burn in 32 mL O2 to produce 56 mL of MgO </span>does not show the law of conservation of mass. Volumes cannot be added because there are volume effects when you add different substances. So, the reactants is not equal to the product.

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2 years ago

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Explain the difference between plant and animals cells in 4 sentences.

dexar [7]

The main structural differences between plant and animal cells are the additional structures found in plant cells. These structures include: chloroplasts, the cell wall, and vacuoles.

6 0

2 years ago

he thermite reaction, in which powdered aluminum reacts with iron(III) oxide, is highly exothermic. 2 Al(s) + Fe2O3(s) Al2O3(s)

Afina-wow [57]

The given question is incomplete. The complete question is

The thermite reaction, in which powdered aluminum reacts with iron oxide, is highly exothermic: $2Al(s)+Fe_2O_3(s)\rightarrow Al_2O_3(s)+2Fe(s)$ . Use standard enthalpies of formation to find ΔH∘rxn for the thermite reaction. Express the heat of the reaction in kilojoules to four significant figures.

Answer: ΔH∘rxn for the thermite reaction is -851.5 kJ

Explanation:

The balanced chemical reaction is :

$2Al(s)+Fe_2O_3(s)\rightarrow Al_2O_3(s)+2Fe(s)$

We have to calculate the enthalpy of reaction $(\Delta H^o)$ .

$\Delta H^o=H_f_{product}-H_f_{reactant}$

$\Delta H^o=[n_{Fe}\times \Delta H_f^0_{(Fe)}+n_{Al_2O_3}\times \Delta H_f^0_{(Al_2O_3)}]-[n_{Al}\times \Delta H_f^0_(Al)+n_{Fe_2O_3}\times \Delta H_f^0_{(Fe_2O_3)}]$

where,

We are given:

$\Delta H^o_f_{(Fe_2O_3(s))}=-824.2kJ/mol\\\Delta H^o_f_{(Al_2O_3(s))}=-1675.7kJ/mol\\\Delta H^o_f_{(Fe(s))}=0kJ/mol\\\Delta H^o_f_{(Al(s)}=0kJ/mol$

Putting values in above equation, we get:

$\Delta H^o_{rxn}=[(2\times 0)+(1\times -1675.5)]-[(2\times 0)+(1\times -824.2)]=-851.5kJ$

ΔH∘rxn for the thermite reaction is -851.5 kJ

4 0

2 years ago

What shape and bond angles would this molecule have in three dimensions?

Darya [45]

Answer : The shape and bond angle of the given molecule is, bent and $120^o$ respectively.

Explanation :

In the given molecule, 'Y' is the central atom and 'X' is the neighboring atom. In the given molecule, there are 4 electron pairs that means the hybridization will be $sp^3$ and the electronic geometry of the molecule will be tetrahedral.

But as there are two atoms around the central atom, the third and fourth position will be occupied by lone pair of electrons. The repulsion between lone and bond pair of electrons is more and hence the molecular geometry will be bent or angular and the bond angle will be, $120^o$ .

Hence, the shape and bond angle of the given molecule is, bent and $120^o$ respectively.

5 0

2 years ago

Read 2 more answers