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3 years ago

10

Hi! I'm doing homework about covalent bonds in Chemistry and I am supposed to figure out which 3 are right and which 3 are wrong

. I'm having a really hard time. Any help is appreciated!

2 answers:

Scilla [17]3 years ago

5 0

1,5,4
I think hope this helps ☺️

Kruka [31]3 years ago

4 0

Answer:1,5,4

Explanation:

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A student has a test tube that contains 50 mL of water. She wants to add a substance to the water that will cause the test tube

PilotLPTM [1.2K]

B
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6 0

2 years ago

Determine the mass of 6.33 mol of iron(II) nitrate.

uysha [10]

Answer:

1822.72 g

Explanation:

Applying,

n = R.M/M.M.................. Equation 1

Where n = number of moles of iron(II) nitrate, R.M = Reacting mass of iron(II) nitrate, M.M = molar mass of Iron(II) nitrate.

Make R.M the subject of the equation

R.M = n×M.M............. Equation 2

From the question,

Given: n = 6.33 mol

Constant: M.M of iron(II) nitrate = 287.95 g/mol

Substitute these values into equation 2

R.M = 6.33(287.95)

R.M = 1822.72 g

Hence the mass of iron(II) nitrate is 1822.72 g

8 0

3 years ago

Practically: Add 1.66 ml of my 0.3M lemonade to a 15 ml microcentrifuge tube. Add 3.33 ml of your diluent (water, in this case)

Sedbober [7]

Answer:

We would need 10 mL of the concentrated CaCl₂ stock solution, and 30 mL of water.

Explanation:

To solve the question asked we can use the C₁V₁=C₂V₂ equation, where:

C₁ = 200 mM

V₁ = ?

C₂ = 50 mM

V₂ = 40 mL

We <u>solve for V₁</u>:

V₁ = 10 mL

We would need 10 mL of the concentrated CaCl₂ stock solution, and (40-10) 30 mL of water.

4 0

3 years ago

How many moles of KCIO3 are required to produce 58.3 grams of 02? <br> 2 KCIO3 —> 2 KCI + 3 O2

strojnjashka [21]

Answer:

1.21 mol KClO₃

General Formulas and Concepts:

<u>Atomic Structure</u>

Reading a Periodic Table
Moles
Mole Ratio

<u>Stoichiometry</u>

Analyzing reactions rxn
Using Dimensional Analysis

Explanation:

<u>Step 1: Define</u>

<em>Identify variables</em>

[rxn] 2KClO₃ → 2KCl + 3O₂

[Given] 58.3 g O₂

[Solve] mol KClO₃

<u>Step 2: Identify Conversions</u>

[rxn] 2 mol KClO₃ → 3 mol O₂

[PT] Molar Mass of O: 16.00 g/mol

Molar Mass of O₂: 2(16.00) = 32.00 g/mol

<u>Step 3: Convert</u>

[DA] Set up: $\displaystyle 58.3 \ g \ O_2(\frac{1 \ mol \ O_2}{32.00 \ g \ O_2})(\frac{2 \ mol \ KClO_3}{3 \ mol \ O_2})$
[DA] Divide/Multiply [Cancel out units]: $\displaystyle 1.21458 \ mol \ KClO_3$

<u>Step 4: Check</u>

<em>Follow sig fig rules and round. We are given 3 sig figs.</em>

1.21458 mol KClO₃ ≈ 1.21 mol KClO₃

6 0

3 years ago

Deep sea divers can experience the bends due to an increased amount of nitrogen in the blood

garri49 [273]

b is the correct answer

6 0

3 years ago