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
Y_Kistochka [10]
2 years ago
15

Observation: I am in the lab timing how long it takes to boil 100 mL of water in a beaker over a Bunsen burner. I observe it tak

es 5:15 mins to boil the water. I want to get the most accurate answer possible so I repeat the test again making sure everything is the same. This time it takes 7:05 mins to boil the water. I think this is unusual so I repeat the experiment a third time and it takes 5:20 mins. What could we infer about the differences in the times observed?
Chemistry
1 answer:
77julia77 [94]2 years ago
8 0

Answer:

The likely causes inferred about the differences in times observed are;

1) Slight increase of the vapor pressure of the air immediately above the water surface due to the presence of a lid

2) Variation of heat input due to wind draft that alters the focus of the flame

3) The introduction of impurities into the water from the water source or through the sourcing mediums or containers or during handling of the water

Explanation:

The factors that affect the boiling point of water includes;

1) The amount of heat supplied, to the water

2) Vapor pressure above the water surface

3) Presence of impurities in the water

Therefore, the most likely causes for the difference in the times observed for the water to boil in the order of increasing probability of cause and effect are therefore;

1) Slight increase of the vapor pressure of the air immediately above the water surface due to the presence of a lid

2) Variation of heat input due to wind draft that alters the focus of the flame

3) The introduction of impurities into the water from the water source or through the sourcing mediums or containers or during handling of the water.

You might be interested in
Which statement describes what happens to the DNA in the process shown? A. Some of the DNA is destroyed, so each daughter cell h
kolbaska11 [484]

hhjjjbvhjbvb

hhmkn

hjkk

hhjj

7 0
3 years ago
Water flows over Niagara Falls at the average rate of 2,400,000 kg/s, and the average height of the falls is about 50 m. Knowing
Zinaida [17]

Answer:

1) The power of Niagara Falls is 1.176 × 10⁹ W

2) The number of 15 W LED light bulbs it could power is 78.4 × 10⁶ light bulbs

Explanation:

1) The Niagara falls water mass flow rate = 2,400,000 kg/s

The height of the fall = 50 meters

The gravitational potential energy = Mass (kg) × height (m) × gravity (9.8 m/s²)

The power = The energy converted per second = Mass flow rate (kg/s) × height (m) × gravity (9.8 m/s²)

Therefore;

The power of Niagara Falls= 2,400,000 kg/s × 50 m ×9.8 m/s²= 1.176 × 10⁹ W

The power of Niagara Falls = 1.176 × 10⁹ W

2) The number, n, of 15 W LED light bulbs it could power is given by the relation;

n × 15 W = 1.176 × 10⁹ W

∴ n = 1.176 × 10⁹ W/(15 W) = 78.4 × 10⁶ light bulbs

The number of 15 W LED light bulbs it could power = 78.4 × 10⁶ light bulbs.

6 0
3 years ago
A gas cylinder of volume 5.00 l contains 1.00 g of ar and 0.500 g of ne. the temperature is 275 k. find the partial pressure of
amid [387]
<span>11.3 kPa The ideal gas law is PV = nRT where P = Pressure V = Volume n = number of moles R = Ideal gas constant (8.3144598 L*kPa/(K*mol) ) T = Absolute temperature We have everything except moles and volume. But we can calculate moles by starting with the atomic weight of argon and neon. Atomic weight argon = 39.948 Atomic weight neon = 20.1797 Moles Ar = 1.00 g / 39.948 g/mol = 0.025032542 mol Moles Ne = 0.500 g / 20.1797 g/mol = 0.024777375 mol Total moles gas particles = 0.025032542 mol + 0.024777375 mol = 0.049809918 mol Now take the ideal gas equation and solve for P, then substitute known values and solve. PV = nRT P = nRT/V P = 0.049809918 mol * 8.3144598 L*kPa/(K*mol) * 275 K/5.00 L P = 113.8892033 L*kPa / 5.00 L P = 22.77784066 kPa Now let's determine the percent of pressure provided by neon by calculating the percentage of neon atoms. Divide the number of moles of neon by the total number of moles. 0.024777375 mol / 0.049809918 mol = 0.497438592 Now multiply by the pressure 0.497438592 * 22.77784066 kPa = 11.33057699 kPa Round the result to 3 significant figures, giving 11.3 kPa</span>
8 0
3 years ago
How many ions are in Li + Cl
Amanda [17]

It contains 5 ions.

Hope that helped!!

6 0
3 years ago
Which scientific discipline belongs in the blue box?
Bess [88]

Answer:

PHYSICS.

Explanation:

BLUE BOX CA BE REFERRED AS AN ELECTRONIC DEVICE WHICH IS USED IN THE TELEPHONIC CIRCIUTSTI PASS ON LONG DIATANT SIGNALS.

7 0
3 years ago
Read 2 more answers
Other questions:
  • In a chemical reaction, the element 13al will most preferably ________. in a chemical reaction, the element 13al will most prefe
    12·1 answer
  • How can I calculate the mass percent of carbon, nitrogen and oxygen in acetamide, C2H5NO?
    12·1 answer
  • The animal kingdom is large and diverse. Scientists discover new species all the time, and they need a way to classify them. The
    12·1 answer
  • Select the correct answer.
    6·1 answer
  • You are asked to determine the identity of an unknown liquid and can measure only one physical property. you heat a liquid and r
    7·1 answer
  • the mass number of a chromium Atom is 52 and it has 24 protons. How many neutrons does this atom have?
    11·2 answers
  • What is two of same elements is called
    10·2 answers
  • Characteristics of bipolar disorder typically include
    7·2 answers
  • Which sequence of events best summarizes how multicellular animals get energy and nutrients for growth, movement, healing, and o
    12·2 answers
  • Hurricanes derive their energy from: Group of answer choices the latent heat of condensation. the latent heat of fusion. the lat
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!