Two scientists made the same observation during an investigation. Since their explanations differed about the observation, they
made additional observations. Why would more observations be helpful for this investigation?
A)
More observations will show both scientists' explanations are not correct.
B)
More observations are needed to show both scientists' explanations are
correct
More observations will prove the scientists' investigation was done
incorrectly.
2)
More observations could help resolve differences in the scientists
explanations.​

Answer:

a.)  

To warm the liquid from 35°C to 78°C:

(2.3 J/g-K) x (42.0 g) x (78 - 35) = 4154 J

To vaporize the liquid at 78°C:

(38.56 kJ/mol) x (42.0 g C2H5OH / 46.06867 g C2H5OH/mol) = 35.154 kJ

Total:

4.154 kJ + 35.154 kJ = 39.3 kJ

b.)  

To warm the solid from -155°C to -114°C:

(0.97 J/g-K) x (42.0 g) x (-114°C - (-155°C)) = 1670 J

To melt the solid at -114°C:

(5.02 kJ/mol) x (42.0 g C2H5OH / 46.06867 g C2H5OH/mol) = 4.5766 kJ  

To warm the liquid from -114°C to 78°C:

(2.3 J/g-K) x (42.0 g) x (78 - (-114)) = 18547 J

To vaporize the liquid at 78°C:

35.154 kJ  (as in part a.)

Total:

1.670 kJ + 4.5766 kJ + 18.547 kJ + 35.154 kJ = 59.9 kJ

Explanation:

 1021.27 J heat is required to heat 9.61g of ethanol from 24.1⁰C to 67.3⁰C

The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius.

It is a measure of how much energy it takes to raise the temperature of a substance. It is the amount of heat necessary to raise one mass unit of that substance by one temperature unit.

It is given by the formula -

                                                  Q = mcΔT

where, Q = amount of heat

m = mass

c = specific heat

ΔT = Change in temperature

Given,

Mass of ethanol = 9.61g

Initial temperature = 24.1⁰C

Final temperature = 67.3⁰C

Q = mcΔ T

        = 9.61 × 2.46 × ( 67.3 - 24.1)

         = 1021.27 J

Therefore,  1021.27 J heat is required to heat 9.61g of ethanol from 24.1⁰C to 67.3⁰C

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Answer:

When there is an increased number of sun spots, it means the surface temperature is decreased which will decrease the temperature of the Earth's surface as well.

Explanation:

Sunspots are temporary phenomena on the Sun's photosphere that appear as spots darker than the surrounding areas. They are regions of reduced surface temperature caused by concentrations of magnetic field flux that inhibit convection. Sunspots usually appear in pairs of opposite magnetic polarity.

Answer:

A i took the test

Explanation:

good luck ;)

Answer  The body also needs calcium for muscles to move and for nerves to carry messages between the brain and every body part. In addition, calcium is used to help blood vessels move blood throughout the body and to help release hormones and enzymes that affect almost every function in the human body

Explanation:

Answer:

Calcium is a mineral for humans which is really important.It helps you be healthy and be in shape(mostly your teeth and your bones).Calcium also keeps your blood and muscles moving and helps your nerves send messages from your brain to the rest of your body.Calcium helps you a lot and is essential to your life.

Hope that was helpful.Thank you!!!

Answer:

a

Explanation:

Answer:

The rotational period of the moon is equal to one revolution around Earth.

I think  this is the answer am not that positive.

Explanation

Only one side of the Moon is visible from Earth because the Moon rotates on its axis at the same rate that the Moon orbits the Earth – a situation known as synchronous rotation, or tidal locking. The Moon is directly illuminated by the Sun, and the cyclically varying viewing conditions cause the lunar phases.

Answer:

The rotational period of the moon is equal to one revolution around the earth

Explanation:

I took the test. Hopes this helps :)

Answer:

just do the lab or what ever

Explanation:

because your just taking notes and taking data

Answer:

Oxygen

Explanation:

Water's formula is H20. Which is two hydrogen and one oxygen.

Answer:

2MnO2 (s)

Explanation:

3KCN(aq) + 2KMnO4(aq) + 1H2O(l) → 3KCNO(aq) + 2MnO2(s) + 2KOH(aq)

Reactants:

K: 5

C: 3

N: 3

Mn: 2

O: 9

H: 2

Products:

K: 5

C: 3

N: 3

Mn: 2

O: 9

H: 2

All the foursingle neutron /proton in the image coming out of the chain reactions and bombarding are responsible of producing a chain reaction.

It is the change in the identity or characteristics of an atomic nucleus, induced by bombarding it with an energetic particle.

The bombarding particle may be an alpha particle, a gamma-ray photon, a neutron, a proton, or a heavy ion.

In the given image of a nuclear reaction the objects which could hit other atoms, producing a chain reaction are all the four single neutron /proton coming out of the chain reactions and bombarding.

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Answer:

Picture of model of a nuclear reaction attached.

Explanation:

Answer:

A.

Explanation:

the boiling point is 4172 F

Answer:

They will share electrons .

Explanation:

When P and O2 reacts, they will share electrons as both of the elements are non-metals.

Only metal elements such as K , Na , Ca , etc. can transfer electrons to the other non-metal elements.

Protons are located in the nucleus of the atom along with neutrons, have a positive charge, and a mass of 1.673 x [tex]10^{-27}[/tex] kg.

A base turns red litmus blue. Litmus paper is paper that has been treated with a specific indicator, a mixture of 10 to 15 natural dyes that turns red in response when the pH is acidic, and blue when it is basic.

Answer:

D

Explanation:

because macroscopic is visible to the naked eye.

Answer:

Since we can't utilize charges to make sense of what number of every particle we have (as we did with ionic mixes), we need to determine with prefixes mono-, di-, tri-, tetra, penta-, hexa-,, etc.

Answer:

C.11

Explanation:

Boron-11 makes up around 80% of all natural Boron. And, typically, the quickest way to determine the most abundant isotope of an element is to just round the atomic mass to the nearest whole number.

Answer:

c . Desert

Explanation:

desert biome is character as a drive with temperature ranging from Hot cold and little plant life .

Answer:

desert

Explanation:

the desert does not have a diverse community with animals, is very dry with little precipitation, and is usually incredibly hot but has a cold/warm temperature at night in the winter.

When you dissolve acid in water  positive hydronium ions are released. Therefore, the correct option is option A.

Any material that when dissolved in water has an acidic taste, may alter the color of some indicators (such as reddening blue litmus paper), can react with some metals (such as iron) to release hydrogen, can combine with bases to produce salts, and can accelerate some chemical changes (acid catalysis).

Acids are examples of both organic chemicals that belong towards the carboxyl group, sulfonic acid, as well as phenol groups as well as the inorganic substances referred as the mineral acids, such as sulfuric, nitric, hydrochloric, as well as phosphoric acids. When you dissolve acid in water positive hydronium ions are released.

Therefore, the correct option is option A.

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Answer: The amount of carbon-14 left after 10 years is 25 g

Explanation:

Formula used :

[tex]a=\frac{a_o}{2^n}[/tex]

where,

a = amount of reactant left after n-half lives = ?

[tex]a_o[/tex] = Initial amount of the reactant = 100 g

n = number of half lives =[tex]\frac{\text {given time}}{\text {half life}}=\frac{10}{5}=2[/tex]

Putting values in above equation, we get:

[tex]a=\frac{100g}{2^2}[/tex]

[tex]a=\frac{100g}{4}=25g[/tex]

Therefore, the amount of carbon-14 left after 10 years is 25 g

8 slices of cheese are required to make 8 ham sandwiches from 16 slices of bread based on the stoichiometry of the reaction.

The balanced equation of the production of ham sandwich is given below:

[tex]2H + C +T+5P+ 2B \rightarrow H_2CTP_5B_2 \\ [/tex]

From the stoichiometry of the reaction, 2 slices of bread and 1 slice of cheese are required to make 1 atm sandwich.

There are 16 slices of bread present to make ham sandwich.

Number of slices of cheese required = 16/2 = 8 slices.

Therefore, 8 slices of cheese are required.

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Answer:

its sunspots :)

Explanation:

can i pleasee have the brainiest tyty

for my rank

The statement is true. Inside heat tends to escape from a house on a cold winter day, primarily through the poorly insulated parts like windows and doors. The principle of heat transfer, specifically conduction, explains this phenomenon.

The statement is True. On a cold winter day, the heat from inside a house tends to move to the colder outside environment, and this flow of heat usually occurs predominantly through the windows and doors if they are not properly insulated. This phenomenon is explained by the principle of heat transfer, specifically the mechanism called conduction, where thermal energy is transferred from a hotter object to a colder one.

Windows, particularly those that are single-pane, are usually not very good insulators, so they can allow a significant amount of heat to escape. This is why in cold climates, it's common to use double-pane or even triple-pane windows, which have air or another insulating material between the panes to reduce heat loss.

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Explanation:

the convection currents in the oven produced by the heat, cooks both the bottom and the top at the same rate.

Answer:

Explanation:

The air is heated by the heat source in the oven. The hot air rises, surrounds the bread, and heats the bread on all sides.

Answer: The moles of gas are in the container are 0.08

Explanation:

According to ideal gas equation:

[tex]PV=nRT[/tex]

P = pressure of gas = 1.0 atm

V = Volume of gas = 2.0 L

n = number of moles = ?

R = gas constant =[tex]0.0821Latm/Kmol[/tex]

T =temperature =[tex]300K[/tex]

[tex]n=\frac{PV}{RT}[/tex]

[tex]n=\frac{1.0atm\times 2.0L}{0.0821L atm/K mol\times 300K}=0.08moles[/tex]

Thus the moles of gas are in the container are 0.08

Answer:

C

Explanation:

The diagram which shows electrons violating the Pauli exclusion principle is: C. a box containing an up and a down arrow and 2 other up arrows.

The Pauli exclusion principle can be defined as a principle which states that no two electrons (fermions) in a single atom can have the same values for all four (4) of their electronic quantum numbers.

Furthermore, this principle states that the orbital of an atom can only contain a maximum of two electrons, and they must have opposing spin orientations.

In conclusion, the diagram which shows electrons violating the Pauli exclusion principle is a box containing an up and a down arrow and 2 other boxes with 2 up arrows, that are having the same spin orientations as shown.

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The correct answer is 'Eukarya because the organisms are all eukaryotic' since the organisms mentioned have cells with nuclei. Bacteria and Archaea are both prokaryotic and do not contain organisms with eukaryotic cells.

The correct answer to the question is A) Eukarya because the organisms mentioned are all eukaryotic. This means that the cells of these organisms contain nuclei. The domain Eukarya includes diverse groups such as animals, plants, fungi, and protists. These kingdoms are distinguished by the presence of eukaryotic cells, which differentiate them from prokaryotic cells found in the other two domains, Bacteria and Archaea, both of which lack a nucleus. Bacteria and Archaea are known as prokaryotes and often consist of single-celled organisms. Eukarya, on the other hand, can consist of both unicellular and multicellular organisms. Therefore, Option B 'Eukarya because the organisms are all prokaryotic' is incorrect as eukaryotes have a nucleus. Option C 'Bacteria because some of the organisms are autotrophs' is not correct either since autotrophy is not exclusive to Bacteria and does not define domain classification on its own. Lastly, Option D 'Archaea because the organisms are all diverse bacteria' is incorrect because Archaea is a separate domain, and it encompasses organisms that are genetically distinct from bacteria and eukaryotes, despite their prokaryotic cell structure.

Answer: The temperature of the heated gas is 357 K

Explanation:

To calculate the final temperature of the system, we use the equation given by Gay-Lussac Law. This law states that pressure of the gas is directly proportional to the temperature of the gas at constant pressure.

Mathematically,

[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex]

where,

[tex]P_1\text{ and }T_1[/tex] are the initial pressure and temperature of the gas.

[tex]P_2\text{ and }T_2[/tex] are the final pressure and temperature of the gas.

We are given:

[tex]P_1=8.53atm\\T_1=293K\\P_2=10.4atm\\T_2=?[/tex]

Putting values in above equation, we get:

[tex]\frac{8.53}{293K}=\frac{10.4}{T_2}\\\\T_2=357K[/tex]

Hence, the temperature of the heated gas is 357 K

Answer:

427.50

Explanation:

The question requests for the missing particle in a nuclear reaction involving the Potassium isotope. Unfortunately, the reaction is incomplete. Nonetheless, the conservation laws of atomic number and atomic mass would be employed to find the missing particle if the equation was complete.

In this nuclear reaction, both the atomic number and the atomic mass must be conserved. For atomic numbers (proton numbers), you add the atomic numbers on one side of the equation and set it equal to the sum of atomic numbers on the other side. The same thing applies to atomic mass (proton + neutron numbers). However, the nuclear reaction is not complete.

This question is seeking to determine the missing particle in this nuclear reaction involving potassium (K). The missing part of the nuclear equation would help us determine the product particles after a certain type of nuclear decay. Unfortunately, the reaction is not completely given, if it were we could utilize conservation laws to identify the missing particle.

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