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3 years ago

7

Please help me! Need quickly!

2 answers:

anzhelika [568]3 years ago

3 0

The correct answer will be C. Carbon and Oxygen because these both are non metals and non metals react colvalently (i.e share electrons) while when metals react with a non metals they react ionically (i.e lose and gain electrons)

lara31 [8.8K]3 years ago

3 0

The correct answer would be C.

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Unit 1 chemistry test

Artist 52 [7]

Ok what’s the question sir

5 0

3 years ago

The thermal decomposition of N2O5 obeys first-order kinetics. At 45°C, a plot of ln[N2O5] versus t gives a slope of −6.40 × 10−4

finlep [7]

Answer:

<u>1,080 min</u>

<u></u>

Explanation:

A <em>first order reaction</em> follows the law:

$rate=k[A]$ , where [A] is the concentraion of the reactant A.

Equivalently:

$\dfrac{d[A]}{dt}=-k[A]$

Integrating:

$\dfrac{d[A]}{[A]}=-kdt$

$\ln \dfrac{[A]}{[A_o]}=-kt$

Half-life means [A]/[A₀] = 1/2, t = t½:

t½ = ln (2) / k

That means that the half-life is constant.

The slope of the plot of ln [N₂O₅] is -k. Then k is equal to 6.40 × 10⁻⁴ min⁻¹.

Thus, you can calculate t½:

t½ = ln(2) / 6.40 × 10⁻⁴ min⁻¹

t½ = 1,083 min.

Rounding to 3 significant figures, that is 1,080 min.

5 0

3 years ago

HIIII ! any k-pop & K-drama stans!? REMEMBER TO THINK POSITIVE & EAT 3 MEALS A DAY, READ A BOOK (ANY BOOK, SHORT OR LONG

Hatshy [7]

Answer:

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Explanation:

4 0

3 years ago

Read 2 more answers

kumpel [21]

Explanation:

Using the Combined Gas Law, which is:

$\frac{P_1V_1}{T_1} =\frac{P_2V_2}{T_2}$

<em>(With </em> $P_1,V_1,T_1$ <em>being initial pressure, volume and temperature; and</em>

<em /> $P_2,V_2,T_2$ <em> being the new values)</em>

<em />

We can move the units around in order to solve for $P_2$ , which would look like this:

$P_{2} =\frac{P_1V_1T_2}{V_2T_1}$

Then we convert the Celsius temperature to Kelvin:

$25$ ° $C$ = $289$ $K$

$100$ ° $C$ = $373$ $K$

And now, we plug in all of the values and solve, with volume remaining as a constant:

$P_{2} =\frac{(1.00 atm) (20.0 L) (373 K)}{(20.0 L) (298 K)}$ $=$

$1.25$ $atm$ <em>or </em> $127$ $kPa$

7 0

4 years ago

Why do cars need a cooling system in conjunction with the engine?

stira [4]

A.
___________________

3 0

3 years ago