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
Oliga [24]
3 years ago
6

I need your help!! about Chemistry (15 point!!)

Chemistry
1 answer:
irakobra [83]3 years ago
6 0
1. I think it is true?
2. Low melting points
3. True
4. Atomic number, I think it’s periods?
5. Groups?


Sorry, I might not get all of them right :(


Hope this helps you in any way!!
You might be interested in
Cual es la nomenclatura stock/tradicional/sistematica del oxigeno????
ANEK [815]

Answer:

english pls so i can answer

7 0
3 years ago
What is the pH of a mixture of 0.042 M NaH2PO4 and 0.058 M Na2HPO4? Hint: The pKa of phosphate is 6.86.
AlekseyPX

Answer:

The pH value of the mixture will be 7.00

Explanation:

Mono and disodium hydrogen phosphate mixture act as a buffer to maintain pH value around 7. Henderson–Hasselbalch equation is used to determine the pH value of a buffer mixture, which is mathematically expressed as,

pH=pK_{a} + log(\frac{[Base]}{[Acid]})

According to the given conditions, the equation will become as follow

pH=pK_{a} + log(\frac{[Na_{2}HPO_{4} ]}{[NaH_{2}PO_{4}]})

The base and acid are assigned by observing the pKa values of both the compounds; smaller value means more acidic. NaH₂PO₄ has a pKa value of 6.86, while Na₂HPO₄ has a pKa value of 12.32 (not given, but it's a constant). Another more easy way is to the count the acidic hydrogen in the molecular formula; the compound with more acidic hydrogens will be assigned acidic and vice versa.

Placing all the given data we obtain,

pH=6.86 + log(\frac{0.058}{0.042})

pH=7.00

5 0
3 years ago
Hi can anyone answer these two distance and time questions
Likurg_2 [28]
1 is hours and 2 is meters
5 0
3 years ago
The natural tendence of an object to resist change in its state of motion is:
melisa1 [442]

Inertia. Inertia is the natural tendency of bodies to remain in their states of either rectilinear or resting motion.

5 0
3 years ago
What is the mass of 8.0 x 10^26 UF6 molecules?
gulaghasi [49]
First, find the number of moles of UF6
Avagadro's number = 6.023 x 10^23

Number of moles = 8.0 x 10^26 / Avagadro's number = 8.0 x 10^26 / 6.023 x 10^23 = 1.328 x 10³ moles

Molecular weight of UF6 = Molecular weight of U (238.02891) + Molecular weight of F6 (6 x 18.9984032) = 238.02891 + 113.9904192 = 352.0193292 g/mol

Therefore mass of 8.0 x 10^26 UF6 molecules = 352.0193292 g/mol x 1.328 x 10³ moles = 467.481669 x 10³ grams




3 0
3 years ago
Other questions:
  • In a chemical reaction, the mass of the reactants always equals the mass of the products.
    5·1 answer
  • What mass of ammonia can be produced if 13.4 grams of nitrogen gas reacted ?
    8·1 answer
  • For 520.0 ml of a buffer solution that is 0.175 m in hc2h3o2 and 0.165 m in nac2h3o2, calculate the initial ph and the final ph
    10·1 answer
  • A reproducible measurement is an accurate one. A. True B. False
    11·2 answers
  • Which circult is a serles circult?​
    14·1 answer
  • . Which statement describes the difference between an independent and dependent variable? a. The dependent variable changes base
    14·2 answers
  • An atom that has 13 protons and 15 neutrons is element
    13·1 answer
  • A sample of 250 g of water are heated from 40°C to 121°C, calculate the amount of heat energy absorbed.
    11·1 answer
  • Magnesium and bisulfate<br> Formula
    13·1 answer
  • Please help me with this question!! I’m not sure if they’re the insoluble ions that precipitate with chromate or the soluble one
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!