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
lora16 [44]
2 years ago
12

A Teacher had her students write down hypothesis about an experiment. Which is a valid hypothesis? (1 point)

Chemistry
1 answer:
just olya [345]2 years ago
7 0

Answer:

You need to add the options to this question.

Explanation:

You might be interested in
Which bond is broken when energy is released?
blsea [12.9K]
Energy is released when a new bonds form.
4 0
3 years ago
Read 2 more answers
The pKa of lactic acid is 3.9. A lactate buffer will be useful from pH values ________. The pKa of lactic acid is 3.9. A lactate
Vedmedyk [2.9K]

Answer:

Explanation:

The usefulness of a buffer is its ability to resist changes in pH when small quantities of base or acid are added to it. This ability is the consequence of having both the conjugate base and the weak acid present in solution which will consume the added base or acid.  

This capacity is lost if the ratio of the concentration of conjugate base to the concentration of weak acid differ by an order of magnitude. Since  buffers having ratios differing by more will have their pH driven by either the weak acid or its conjugate base .

From the Henderson-Hasselbach equation we have that

pH = pKa + log [A⁻]/[HA]

thus

0.1 ≤  [A⁻]/[HA] ≤ 10

Therefore the log of this range is -1 to 1, and the pH will have a useful range of within +/- 1 the pKa of the buffer.

Now we are equipped to answer our question:

pH range = 3.9 +/- 1 = 2.9 through 4.9

7 0
3 years ago
How do hot fluids act in metamorphism?
olga nikolaevna [1]

Answer:

Hot fluids are formed mainly of water and dissolved minerals. They can seep through rocks and chemically react with the minerals in the rocks potentially changing the composition of the rock. Metamorphic rocks can form from other metamorphic rocks.

5 0
3 years ago
Read 2 more answers
What is the reason behind that the melting and boiling point of iron is more than that of sodium?​
sweet [91]

Answer:

As metals are giant lattice structures, the number of electrostatic forces to be broken is extremely large, and so metals have high melting and boiling points. This means that the melting point and boiling point of metals are more similar to those for ionic compounds than for covalent substances.

Explanation:

3 0
3 years ago
Use the periodic table to identify each of the following bonds as polar or nonpolar.
Molodets [167]

Answer:

Polar  

Step-by-step explanation:

Electronegativity increases from <em>left to right</em> in the Periodic Table.

Cl is further right than C (both tinted pink) in the portion of the Periodic Table below.

Cl is <em>more electronegative</em> than C, so the Cl has a partial negative charge and the C has a partial positive charge.

The C-Cl bond is polar.

5 0
3 years ago
Other questions:
  • How do evaporation and boiling differ?
    9·2 answers
  • Which type of energy in gasoline is transformed into mechanical energy and a motorcycle engine
    12·1 answer
  • D) does not dissociate in solution.
    12·1 answer
  • A wave at sea travel with a velocity of 25 m/s. If it has a wavelength of 10 m, what is it’s frequency?
    13·1 answer
  • Which of the following 0.820 M solutions would have the greatest colligative effect?
    9·1 answer
  • James Watson and Francis Crick _____.
    7·2 answers
  • Describe what happens when ionic and covalent (molecular) substances dissolve. Fill in the blanks using the options below:covale
    9·1 answer
  • If the same large amount of heat is added to a 250 g piece of aluminum and a 150 g piece of aluminum, what will happen? The 150
    12·1 answer
  • Use the drop-down menus to complete the statement and describe how energy relates to work.
    6·2 answers
  • Fill in the coefficients that will balance the following reaction:
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!