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3 years ago

Can you please help me with these true and false questions thanks!

Chemistry

1 answer:

jek_recluse [69]3 years ago

6 0

1 true
2 false
3 false
4 true
5false
6 false
7false
8true

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Which element is malleable and can conduct electricity in the solid phase?

Liono4ka [1.6K]

4 Tin is malleable and matrimonial lead in electricity.

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3 years ago

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In an atomic model that includes a nucleus, negative charge is

Ber [7]

In an atomic model that includes a nucleus, the negative charge correlates to the electron and is located outside of the positively charged nucleus. It is found in a given region, where there is a probability of electrons to be found called the electron cloud.

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4 years ago

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odium carbonate (Na2CO3Na2CO3) is used to neutralize the sulfuric acid spill. How many kilograms of sodium carbonate must be add

Arte-miy333 [17]

Answer : The mass of sodium carbonate added to neutralize must be, $6.54\times 10^3kg$

Explanation :

First we have to calculate the moles of $H_2SO_4$ .

$\text{Moles of }H_2SO_4=\frac{\text{Mass of }H_2SO_4}{\text{Molar mass of }H_2SO_4}$

Given:

Molar mass of $H_2SO_4$ = 98 g/mole

Mass of $H_2SO_4$ = $6.05\times 10^3kg=6.05\times 10^6g$

Conversion used : (1 kg = 1000 g)

Now put all the given values in the above expression, we get:

$\text{Moles of }H_2SO_4=\frac{6.05\times 10^6g}{98g/mol}=6.17\times 10^4mol$

The moles of $H_2SO_4$ is, $6.17\times 10^4mol$

Now we have to calculate the moles of $Na_2CO_3$

The balanced neutralization reaction is:

$Na_2CO_3+H_2SO_4\rightarrow Na_2SO_4+H_2CO_3$

From the balanced chemical reaction we conclude that,

As, 1 mole of $H_2SO_4$ neutralizes 1 mole of $Na_2CO_3$

So, $6.17\times 10^4mol$ of $H_2SO_4$ neutralizes

Now we have to calculate the mass of $Na_2CO_3$

$\text{ Mass of }Na_2CO_3=\text{ Moles of }Na_2CO_3\times \text{ Molar mass of }Na_2CO_3$

Molar mass of $Na_2CO_3$ = 106 g/mole

$\text{ Mass of }Na_2CO_3=(6.17\times 10^4mol)\times (106g/mole)=6.54\times 10^6g=6.54\times 10^3kg$

Thus, the mass of sodium carbonate added to neutralize must be, $6.54\times 10^3kg$

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4 years ago

Explain the solute and the solvent in a solution

romanna [79]

Answer:

a solute is a substance that is dissolved in the solvent (liquid)

a solvent is a substance that dissolves a solute (solid)

a solution is the mixture of both the solute and solvent forming uniform mixture

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3 years ago

When balanced, which equations would have the coefficient 3 in front of the first set of atoms? Check all that apply. A. AgBr +

masha68 [24]

<span>Balancing the choices, we have as follows:

A. 3AgBr + GaPO4 → Ag3PO4 +GaBr3

B. 3H2SO4 + 2B(OH)3 → B2(SO4)3 + 6H2O

C. Fe + 2AgNO3 → Fe(NO3)2 + 2Ag

D. C2H4O2 +2O2 → 2CO2 + 2H2O

Therefore, the correct answers are option A and B. Hope this answers the question. Have a nice day.</span>

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4 years ago