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
algol13
3 years ago
5

What could you change or add to your models based on what you have learned about molecules and phases so far?

Chemistry
2 answers:
timurjin [86]3 years ago
5 0

Answer:Phase changes require either the addition of heat energy (melting, evaporation, and sublimation) or subtraction of heat energy (condensation and freezing). ... Changing the amount of heat energy usually causes a temperature change.

Explanation:

babymother [125]3 years ago
3 0
Ummm I don’t know ‍♀️
You might be interested in
7 g of table salt is add to water in a dish. The dish is then heated until all the water evaporates. Assuming no chemical reacti
Aleks04 [339]

Answer:

7 grams

Explanation:

The water evaporates leaving the same amount of salt behind

hope this helps...

8 0
3 years ago
A 0.200 M solution of a weak acid, HA, is 9.4% ionized. Using this information, calculate Ka for HA.
slavikrds [6]

{ \qquad\qquad\huge\underline{{\sf Answer}}}

Let's solve ~

Initial concentration of weak acid HA = 0.200 M

and dissociation constant ({ \alpha}) is :

\qquad \sf  \dashrightarrow \:  \alpha =  \frac{dissociation \:  \: percentage}{100}

\qquad \sf  \dashrightarrow \:  \alpha =  \frac{9.4}{100}  = 0.094

Now, at initial stage :

  • \textsf{ Conc of HA = 0.200 M}

  • \textsf{Conc of H+ = 0 M}

  • \textsf{Conc of A - = 0 M}

At equilibrium :

  • \textsf{Conc of HA = 0.200 - 0.094(0.200) = 0.200(1 - 0.094) = 0.200(0.906) = 0.1812 M}

  • \textsf{Conc of H+ = 0.094(0.200)  = 0.0188 M}

  • \textsf{Conc of A - = 0.094(0.200)  = 0.0188 M}

Now, we know :

\qquad \sf  \dashrightarrow \: { K_a = \dfrac{[H+] [A-]}{[HA]}}

( big brackets represents concentration )

\qquad \sf  \dashrightarrow \: { K_a = \dfrac{0.0188×0.0188}{0.1812}}

\qquad \sf  \dashrightarrow \: { K_a = \dfrac{0.00035344}{0.1812}}

\qquad \sf  \dashrightarrow \: { K_a \approx 0.00195 }

\qquad \sf  \dashrightarrow \:  {K_a \approx 1.9 × {10}^{-3} }

7 0
2 years ago
Why an aspirin tablet works faster if it is crushed rather than swallowed whole?​
givi [52]

Answer: because the tablet is already crushed and is easy for the organism to absorb instead of having to break it down

Explanation:

7 0
3 years ago
Looking across period 4 of the periodic table, potassium (atomic number 19) is followed by calcium (atomic number 20), which is
Anika [276]
Atomic radius increases as you move left across the periodic table, therefore, potassium will have the largest atomic radius
3 0
3 years ago
How many electrons are located in the outermost energy level in the Bohr model of a boron atom? hint it not 4
borishaifa [10]
2 is the answer iam not sure about it
Yes
6 0
3 years ago
Other questions:
  • A sample of c3h8 has 4.56 Ã 1024 h atoms. how many carbon atoms does the sample contain?
    15·1 answer
  • Determine the type of reaction: H2O + C16H17NaO14 = CO2 + H20 + C2H3NaO3?
    14·2 answers
  • An open-minded scientist does all of the following except A. question existing ideas. B. hold on to his or her beliefs even if t
    11·2 answers
  • What are the main properties of a mixture
    14·1 answer
  • The frequency of a signal is found to be 6389 with an uncertainty of 436 Hz. To the correct number of significant digits, it sho
    6·1 answer
  • What does a particular point on a line of a phase diagram represent ?
    5·2 answers
  • How many liters of oxygen gas are there in 45.0g O, at 0 degrees C and 1 atm of pressure? make sure to round to the correct numb
    14·1 answer
  • Which process is a genetic engineering process?
    8·2 answers
  • Few grapes are placed in a bowl filled with honey and left undisturbed for few hours. What can be observed in the grapes after f
    10·1 answer
  • A tool might be made of an alloy because the alloy _____.
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!