1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Bad White [126]
3 years ago
11

What property can be used to determine if a sample is a pure substance or a mixture?

Chemistry
1 answer:
Yuliya22 [10]3 years ago
7 0

Answer:

Melting point

Explanation:

Pure substances have sharp melting and boiling points while impurities lower the melting point and raise the boiling point

You might be interested in
If a concentration had X number of compounds and its concentration was 7 mol/L, if
Andreyy89

Answer:I think the answer would be 2 mol/L

7 0
3 years ago
Draw the electron dot structure for the hydrogen carbonate ion hco3-. Carbon is the central atom, and hydrogen is attached to ox
Anna11 [10]

Explanation:

this is your answer hope it will help you

5 0
2 years ago
An intravenous infusion is to contain 15 mEq of potassium ion and 20 mEq of sodium ion in 500 mL of 5% dextrose injection. Using
Studentka2010 [4]

Answer:

To supply the required ions it is necessary to inject 5,6mL of 6g/30mL solution and 131,1 mL of 0,9% solution.

Explanation:

1mEq of sodium are 59mg of NaCl and 1mEq of potassium are 75mg KCl

in intravenous infusion 15 mEq of K are:

15x75mg KCl = 1,125g of KCl

And 20 mEq of Na are:

20x59mg NaCl = 1,18g of NaCl

To supply the potassium ion it is necessary to inject:

1,125g of KCl×\frac{30mL}{6g} =<em> 5,6mL  of 6g/30mL solution</em>

And, to supply the sodium ion it is necessary to inject:

1,18g of NaCl×\frac{100mL}{0,9g} = <em>131,1 mL of 0,9% solution</em>

<em />

I hope it helps!

6 0
4 years ago
For a particular reaction, ΔH∘=20.1 kJ/mol and Δ????∘=45.9 J/(mol⋅K). Assuming these values change very little with temperature,
tia_tia [17]

Answer:

The temperature should be higher than 437.9 Kelvin (or 164.75 °C) to be spontaneous

Explanation:

<u>Step 1:</u> Data given

ΔH∘=20.1 kJ/mol

ΔS is 45.9 J/K

<u>Step 2:</u> When is the reaction spontaneous

Consider temperature and pressure = constant.

The conditions for spontaneous reactions are:

ΔH <0

ΔS  > 0

ΔG <0  The reaction is spontaneous at all temperatures

ΔH <0

ΔS  <0

ΔG <0 The reaction is spontaneous at low temperatures ( ΔH - T*ΔS <0)

ΔH >0

ΔS  >0

ΔG <0 The reaction is spontaneous at high temperatures ( ΔH - T*ΔS <0)

<u>Step 3:</u> Calculate the temperature

ΔG <0 = ΔH - T*ΔS

T*ΔS > ΔH

T > ΔH/ΔS

In this situation:

T > (20100 J)/(45.9 J/K)

T > 437.9 K

T > 164.75 °C

The temperature should be higher than 437.9 Kelvin (or 164.75 °C) to be spontaneous

7 0
3 years ago
The chemistry lab is 0.3394km from the nurses office. How many feet is the distance?
nlexa [21]
Easy just convert it to feet the answer is <span>1113.51706 Feet

</span>
6 0
4 years ago
Other questions:
  • What stores water, waste, and nutrients for the cell? A Plasma Membrane B Vacuole C Golgi Body D Nucleus
    13·1 answer
  • What is the ratio of molecules in the chemical equation below N2+3N2-&gt; 2NH3
    14·1 answer
  • What's an atom ?<br> Science
    5·2 answers
  • Elabora un organizador visual de cuales son las partes de una carta
    13·1 answer
  • During an experiment, 102 grams of calcium carbonate react with an excess amount of hydrochloric acid. If the percent yield of t
    6·1 answer
  • can someone please help me with this question, it's for my lab report. I tried my best but failed to do the calculation. please
    14·1 answer
  • Someone pleaseeeeee helppp
    14·1 answer
  • Ra/te me from 0 - 10<br> Im bored girls and guys<br> (i dont judge) :)
    14·1 answer
  • Name this organic compound​<br>I don't need explaination just give the name
    6·1 answer
  • An element consists of 1.40% of an isotope
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!