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vovikov84 [41]
3 years ago
6

What distinguishes two substances combined to become a compound vs. two substances combined to become a mixture? A. whether they

can be easily separated B. whether they chemically bond together C. whether they both are visible D. whether they are heterogeneous
Chemistry
1 answer:
JulijaS [17]3 years ago
4 0
The answer would be B.

Why?

Because compounds are a combination of two or more elements, while a mixture can be virtually anything. We cannot simply mix hydroxide and sodium together and claim it as a physical bond, it doesn't make sense since they react with each other in some way. However, mixtures are typically physical, since a chemical change most likely would not occur if we mixed popcorn and pretzels together in a bowl to make chex mix.

I hope I could help and I hope this made sense!
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What is the mass of 3.01 x 10^21 atoms of Co
OlgaM077 [116]

Answer:

0.295 g Co

General Formulas and Concepts:

<u>Chemistry - Atomic Structure</u>

  • Reading a Periodic Table
  • Using Dimensional Analysis
  • Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

Explanation:

<u>Step 1: Define</u>

3.01 × 10²¹ atoms Co

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

Avogadro's Number

Molar Mass of Co - 58.93 g/mol

<u>Step 3: Convert</u>

<u />3.01 \cdot 10^{21} \ atoms \ Co(\frac{1 \ mol \ Co}{6.022 \cdot 10^{23} \ atoms \ Co} )(\frac{58.93 \ g \ Co}{1 \ mol \ Co} ) = 0.294552 g Co

<u>Step 4: Check</u>

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

0.294552 g Co ≈ 0.295 g Co

5 0
3 years ago
How many atoms of oxygen are in a molecule of glucose<br> (C6H12O6)
valentinak56 [21]

Answer:

It is 6

Explanation:

6 oxygen atoms

4 0
2 years ago
Read 2 more answers
A 25.0 ml sample of 0.723 m hclo4 is titrated with a 0.273 m koh solution. the h3o concentration after the addition of 50.0 ml o
3241004551 [841]
This is an acid base reaction and the chemical equation for the above reaction is as follows;
KOH  + HClO₄ ---> KClO₄ + H₂O
the stoichiometry of acid to base is 1:1
KOH is a strong base and HClO₄ is a strong acid therefore they both ionize completely into their respective ions
Number of KOH moles - 0.723 M/1000 mL/L x 25.0 mL = 0.018 mol
Number of HClO₄ moles - 0.273 M/1000 mL/L x 50 mL = 0.013 mol 
since acid and base react completely, 0.013 mol of acid reacts with 0.013 mol of base.
The excess base remaining is - 0.018 - 0.013 = 0.005 mol 
total volume of solution = 25.0 mL + 50.0 mL = 75.0 mL 
[OH⁻] = 0.005 mol/0.075 L = 0.067 M 
pOH = -log[OH⁻]
pOH = -log(0.067 M)
pOH = 1.17
pOH + pH = 14
Therefore pH = 14 - 1.17 = 12.83
by knowing pH we can calculate the [H₃O⁺]
pH = -log [H₃O⁺]
[H₃O⁺] = antilog[-12.83]
[H₃O⁺]= 1.47 x 10⁻¹³ M
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3 years ago
True or false? In giant covalent structures the atoms form strong bonds by sharing electrons.
schepotkina [342]

Answer:

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qwelly [4]

Answer:

D

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