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
Lena [83]
2 years ago
11

PLEASE HELP, this assignment is worth 45 points and i dont have any free time to finish it

Chemistry
2 answers:
fomenos2 years ago
6 0

........................

777dan777 [17]2 years ago
4 0
…………….. ………….…
…………………………………………………
You might be interested in
Hi can someone please help me find the average for these temperatures? I need them asap
goblinko [34]

Answer:

55 degrees F - cold water

120 degrees F

the last on I don't know

5 0
2 years ago
What element transmits heat easily
pashok25 [27]
A conductor transmits heat and electrical good. 
8 0
2 years ago
Hardness in groundwater is due to the presence of metal ions, primarily Mg2 and Ca2 . Hardness is generally reported as ppm CaCO
Maslowich

Answer:

  • 0.0144 M
  • 1440 ppm

Explanation:

Ca(In)²⁺ + EDTA → Ca(EDTA)²⁺ + In

We use the volume of EDTA consumed in the titration to <u>calculate the moles of Ca⁺² ions</u>:

  • 0.012 L * 0.0600 M * \frac{1molCa^{+2}}{1molEDTA} = 7.20x10⁻⁴ mol Ca⁺²

Now we <u>calculate the molarity</u>:

  • 7.20x10⁻⁴ mol Ca⁺² / 0.050 L = 0.0144 M

To calculate in ppm, we <u>use the moles of Ca⁺² and convert to mg of CaCO₃:</u>

  • 7.20x10⁻⁴ mol Ca⁺² = 7.20x10⁻⁴ mol CaCO₃
  • 7.20x10⁻⁴ mol CaCO₃ * 100g/mol * \frac{1000mg}{1g} = 72 mg CaCO₃

Finally, <u>the concentration in ppm</u> is:

  • 72 mg CaCO₃ / 0.050L = 1440 ppm
5 0
2 years ago
Why is it necessary to use clean sponge and cleaning rags in dishwashing?​
NARA [144]

Answer:

cloths/sponges can harbor harmful pathogens and spread germs if not cleaned frequently. A damp, smelly dish cloth/sponge is telling you germs are multiplying!

Explanation:

hope this is able to help you :)

6 0
2 years ago
Is boiling eggs chemical or physical practice?
Elden [556K]

Answer:

chemical

Explanation:

because heat is being taken to the egg

3 0
3 years ago
Other questions:
  • For each of the processes, determine whether the entropy of the system is increasing or decreasing. The system is underlined.
    13·1 answer
  • A 9.87-gram sample of an alloy of aluminum and magnesium is completely reacted with hydrochloric acid and yields 0.998 grams of
    11·1 answer
  • Which of the following most accurately describes the effect of exposure to radiation? Select all that apply
    13·2 answers
  • Which of the following is a compound? A. Sn B. CO C. H D. Mg
    9·1 answer
  • Diets that are high in ____ are associated with an increased incidence of hypertension.
    12·1 answer
  • A tank has 1.90 mols of Nz gas under a pressure of 4.972 atm at 31.8 °C.
    15·2 answers
  • What do fossil fuels come from?
    12·1 answer
  • What happens when liquid changes to gas?
    15·1 answer
  • A mixture of He, Ar, and Xe has a total pressure of 2.40 atm. The partial pressure of He is 0.300 atm, and the partial pressure
    8·1 answer
  • How many moles of OH−(aq) (hydroxide ions)are present in the balanced redox reaction?
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!