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3 years ago

I promise its easy points

Chemistry

1 answer:

Pepsi [2]3 years ago

7 0

Answer:

The theory for the origin and evolution of the universe is the Big Bang model, which states that the universe began as an incredibly hot, dense point roughly 13.7 billion years ago.

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THIS IS EASY BUT FOR SOME REASON MY BRAIN IS DED PLS HELP

Mama L [17]

Answer:

Solid

Explanation:

The particles in the solid matter are held close together and in fixed particles.

6 0

3 years ago

What is the chemical formula for the binary compound composed of au3+ and i- ions?

Step2247 [10]

AuI3, or Gold Iodide.

Hope this helps! :)

8 0

3 years ago

The half-life of a first-order reaction is 13 min. If the initial concentration of reactant is 0.13 M, it takes ________ min for

Zigmanuir [339]

Answer:

Therefore it takes 8.0 mins for it to decrease to 0.085 M

Explanation:

First order reaction: The rate of reaction is proportional to the concentration of reactant of power one is called first order reaction.

A→ product

Let the concentration of A = [A]

$\textrm{rate of reaction}=-\frac{d[A]}{dt} =k[A]$

$k=\frac{2.303}{t} log\frac{[A_0]}{[A]}$

[A₀] = initial concentration

[A]= final concentration

t= time

k= rate constant

Half life: Half life is time to reduce the concentration of reactant of its half.

$t_{\frac{1}{2} }=\frac{0.693}{k}$

Here $t_{\frac{1}{2} }=0.13 min$

$k=\frac{0.693}{t_{\frac{1}{2}} }$

$\Rightarrow k=\frac{0.693}{13 }$

To find the time takes for it to decrease to 0.085 we use the below equation

$k=\frac{2.303}{t} log\frac{[A_0]}{[A]}$

$\Rightarrow t=\frac{2.303}{k} log\frac{[A_0]}{[A]}$

Here , $k=\frac{0.693}{13 }$ , [A₀] = 0.13 m and [ A] = 0.085 M

$t=\frac{2.303}{\frac{0.693}{13} } log(\frac{0.13}{0.085})$

$\Rightarrow t= 7.97\approx 8.0$

Therefore it takes 8.0 mins for it to decrease to 0.085 M

7 0

3 years ago

What is the pH of a solution with [H+]2.3 x 10^-9 ? a. -9.00B.-8.64C. 9.00D.8.64?

Assoli18 [71]

pH can be defined as negative logarithm of hydronium ion concentration .

pH can be mathematical represented as :

pH =-log [H+]

[H+]=2.3*10^-9

pH= -log[2.3*10^-9]

=8.64

5 0

4 years ago

Read 2 more answers

What are ways that we can respond to eliminate an invasive species? Choose all that apply.

Dafna1 [17]

B. chemical control by use of chemicals

D.physical control by physically removing the species

A. biological control by using other living organisms to rid of invasive species

Taken the quiz, and got them all correctly answered!
Have a good day.

4 0

3 years ago