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
lianna [129]
3 years ago
15

To test the quality of water sources in her area, Shameka collects five samples from each water source and tests the quality of

each sample.
Which important step of scientific design
is Shameka conducting?​

Chemistry
1 answer:
RUDIKE [14]3 years ago
5 0
Experiment because she is actually taking the samples and testing them.
You might be interested in
Please help with these asap
aleksklad [387]

14. a. Acidic

15. b. Weaker

16. d. Dilute and weak

Explanation:

14. Which type of the solution is one with the pH of 3?

Solution with pH from 1 to 7 are acidic, equal to 7 is neutral and from 7 to 14 basic. The solution with the pH equal to 3 is <u>acidic</u>.

15. The smaller the value of the base dissociation constant (Kb), the <u>weaker</u> the base.

The dissociation reaction of a base (B) is:

B + H₂O → BH⁺ + OH⁻

Kb is defined as:

Kb = ( [BH⁺] × [OH⁻] ) / ( [B] × [H₂O] )

The potency of the base depends on the concentration of the hydroxide ion [OH⁻], so if the Kb ratio is small it means that the concentration of hydroxide ion is smaller so the base will be <u>weaker</u>.

16. A 0.39 M solution of an acid that ionizes only slightly in solution would be termed <u>dilute and weak</u>.

The acid is weak because is only slightly ionizing in solution. The therm diluted is a little bit arbitrarily because we ask yourself "diluted in respect with what"? I would characterize the acid to be diluted at a concentration of 1 M and concentrated at a concentration of 10 M.

Learn more about:

pH

brainly.com/question/1402522

#learnwithBrainly

8 0
3 years ago
Find the mass (in g) of 1.00 atom of lead.
Mice21 [21]

Answer:

207g

Explanation:

207.2 to be more specific

6 0
3 years ago
The gas in an aerosol can is at a pressure of 3.16 atm at 32.2°C. What would the gas pressure in the can be at 22.9°C?
olasank [31]

Answer:

The pressure of the gas would be 3.06 atm

Explanation:

Amonton's law states that the pressure is directly proportional to the absolute temperature of a gas under constant volume. The equation is:

P1 / T1 = P2 / T2

<em>Where P1 is the initial pressure = 3.16atm</em>

<em>T1 is initial absolute temperature = 273.15 + 32.2°C = 305.35K</em>

<em>P2 is our incognite</em>

<em>And T2 is = 273.15 + 22.9°C = 296.05K</em>

<em />

Replacing:

3.16atm / 305.35K = P2 / 296.05K

3.06 atm = P2

<h3>The pressure of the gas would be 3.06 atm</h3>
5 0
3 years ago
The decomposition of NH4HS is endothermic: NH4HS(s)⇌NH3(g)+H2S(g) Part A Which change to an equilibrium mixture of this reaction
shepuryov [24]

Explanation:

According to Le Chatelier's principle, any disturbance caused in an equilibrium reaction will shift the equilibrium in a direction that will oppose the change.

As the given reaction is as follows.

       NH_{4}HS(s) \rightleftharpoons NH_{3}(g) + H_{2}S(g)

(a)  When increase the temperature of the reactants or system then equilibrium will shift in forward direction where there is less temperature. It is possible for an endothermic reaction.

Thus, formation of H_{2}S will increase.

  • (b)  When we decrease the volume (at constant temperature) of given reaction mixture then it implies that there will be increase in pressure of the system. So, equilibrium will shift in a direction where there will be decrease in composition of gaseous phase. That is, in the backward direction reaction will shift.

Hence, formation of H_{2}S will decrease with decrease in volume.

  • When we increase the mount of NH_{4}HS then equilibrium will shift in the direction of decrease in concentration that is, in the forward direction.

Thus, we can conclude that formation of H_{2}S will increase then.

3 0
3 years ago
Which system includes feet, pounds, gallons, and miles?<br><br> metric <br><br> customary
slavikrds [6]

Answer:

customary Is the required system

3 0
2 years ago
Other questions:
  • Convert 0.14 kilograms to grams.
    8·1 answer
  • Helppppppppppppppppppppppppppp
    13·1 answer
  • When interviewed, Mr. Harrison was discussing barometric pressure and the low-pressure system moving in that may cause a change
    11·2 answers
  • When a 3.80 g sample of magnesium nitride (MW 101g/mol) is reacted with 3.30 g of water, 3.60 g of MgO is formed. What is the pe
    11·2 answers
  • Use the dichotomous key to identify these plant leaves.
    5·1 answer
  • What does inductive effect mean?​
    13·1 answer
  • A) melissa planted more seeds than juan.
    7·2 answers
  • Determine el número de muléculas y átomos contenidos en 64g de O2
    10·1 answer
  • What is the Law of the Conservation of Mass
    9·1 answer
  • An ice freezer behind a restaurant has a freon leak, releasing 41.44 g of C2H2F3Cl into the air every week. If the leak is not f
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!