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4 years ago

How to make a lightsaver

Chemistry

1 answer:

Nikolay [14]4 years ago

7 0

saber is the right word

the should not be on brainly but...

idd get some glow sticks and put them in a this plastic rap then get some sort of handle or something and put plastic on the outsided too make it strait OR mow the lawn get 5 bucks and buy one

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HEEEEeEELP PLEasE! IS SCIENCE

Fynjy0 [20]

Gas and radio waves I’m pretty sure is correct

6 0

3 years ago

I NEED HELP PLEASE, THANKS!

Crazy boy [7]

Answer:

Here's what I get.

Explanation:

1. Brønsted-Lowry theory

An acid is a substance that can donate a proton to another substance.

A base is a substance that can accept a proton from another substance.

2. pH of ammonia

The chemical equation is

$\rm NH$_{3}$ + \text{H}$_{2}$O \, \rightleftharpoons \,$ NH$_{4}^{+}$ + \text{OH}$^{-}$$

For simplicity, let's re-write this as

$\rm B + H$_{2}$O \, \rightleftharpoons\,$ BH$^{+}$ + OH$^{-}$$

(a) Set up an ICE table.

B + H₂O ⇌ BH⁺ + OH⁻

I/mol·L⁻¹: 0.335 0 0

C/mol·L⁻¹: -x +x +x

E/mol·L⁻¹: 0.335 + x x x

$\rm K_{\text{b}} = \dfrac{\text{[BH}^{+}]\text{[OH}^{-}]}{\text{[B]}} = 1.8 \times 10^{-5}\\\\\dfrac{x^{2}}{0.335 - x} = 1.8 \times 10^{-5}$

Check for negligibility:

$\dfrac{0.335}{1.8 \times 10^{-5}} = 28 000 > 400\\\\x \ll 0.335$

(b) Solve for [OH⁻]

$\dfrac{x^{2}}{0.335} = 1.8 \times 10^{-5}\\\\x^{2} = 0.335 \times 1.8 \times 10^{-5}\\x^{2} = 6.03 \times 10^{-6}\\x = \sqrt{6.03 \times 10^{-6}}\\x = \text{[OH]}^{-} = \mathbf{2.46 \times 10^{-3}} \textbf{ mol/L}$

(c) Calculate the pOH

$\text{pOH} = -\log \text{[OH}^{-}] = -\log(2.46 \times 10^{-3}) = 2.61$

(d) Calculate the pH

pH = 14.00 - pOH = 14.00 - 2.61 = 11.39

3 0

4 years ago

What is the. Question

wel

Hi there!

The answer is B. Degrees Celsius. Because Celsius is the only option that measures temperature.

Hope this helped!! ☺♥

8 0

3 years ago

Read 2 more answers

Chemistry compound empirical formula and identify compounds weightWhich drug is c3 h3 01

valkas [14]

The drug C3H30 is called allenolate / 1-hydroxycyclopropyl

weight is 55.06g/mol

5 0

1 year ago

Describe what can happen to the reaction rate of a system that is heated then cooled

SIZIF [17.4K]

The answer for this question would be when we increase the temperature of a particular object, its molecules get energy in that specific reaction takes place more quickly and if we decrease the temperature the reverse of what will happen to that thing.

7 0

3 years ago