Why did the beaker most likely feel warm

The answer is:

the volume stays the same. it is the pressure that increases

The balanced chemical equation for the reaction of solid carbon with oxygen gas to produce carbon dioxide is C + O_2 → CO_2. The equation is balanced as per the law of conservation of mass.

The balanced chemical reaction between oxygen gas and solid carbon to produce carbon dioxide is written as follows:

C + O_2 → CO_2

In this equation, 'C' represents solid carbon and 'O2' represents oxygen gas. On the reactant side of the equation, we have one atom of carbon and two atoms of oxygen. On the product side, we have one molecule of carbon dioxide which consists of one carbon atom and two oxygen atoms. This confirms that the equation is balanced according to the law of conservation of mass which states that the number of atoms of each element on the reactant side must be equal to the number of atoms of the same element on the product side in any given chemical reaction.

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Final answer:

Solid carbon reacts with oxygen gas to produce carbon dioxide gas, represented by the balanced chemical equation: [tex]C(s) + O2(g) - CO2(g).[/tex]  The equation balances the number of atoms on both sides, conforming to the conservation of mass.

Explanation:

When solid carbon reacts with oxygen gas, the product is carbon dioxide gas. This reaction is an important example of a combustion reaction where carbon combines with oxygen to produce carbon dioxide. The balanced chemical equation for this reaction is:

[tex]C(s) + O2(g) - CO2(g)[/tex]

In this equation, the (s), (g), and (g) represent the physical states of the substances involved: solid, gas, and gas, respectively. It's vital to balance chemical equations to reflect the conservation of mass, indicating that the same number of atoms of each element react and are present in the products. In this case, one atom of carbon reacts with one molecule of oxygen (which consists of two atoms of oxygen) resulting in one molecule of carbon dioxide.

maybe it when you do not know what is going to happen the future

F, Br, l

Answer:

F, Br, l

Explanation:

Astatine is radioactive element which has symbol, At and the atomic number of the element is 85.

It belongs to the group 17 and period 6.

The elements in the same group shows similar properties as they have same general electronic configuration.

So, it shows similar properties with group 17 elements which are - F, Cl , Br, l

Answer- A

Answer:

9414.0 J.

Explanation:

Q = m.c.ΔT.

where, Q is the amount of heat absorbed by water,

m is the mass of water (m = 150.0 g),

c is the specific heat of water (c = 4.184 J/g °C),

ΔT is the temperature difference (final T - initial T) (ΔT = 15.0 °C).

∴ Q = m.c.ΔT = (150.0 g)(4.184 J/g °C)(15.0 °C) = 9414.0 J.

Answer:

a) 5.0 g.

b) 2.94 g.

c) 0.02798 mol.

d) 2.06 g.

e) 0.1144 mol.

f) 4.0 mol/mol.

g) Yes, the experiment results corroborate with the formula BeSO₄.4H₂O.

Explanation:

a) Determine the mass of the original hydrate.

The mass of the original hydrated salt = The mass of the crucible with the hydrated salt - the mass of the empty crucible = 15.0 g - 10.0 g = 5.0 g.

b) Determine the mass of just the anhydrous salt.

The mass of the anhydrous salt = the mass of the crucible with the anhydrous salt (after heating) - the mass of the empty crucible = 12.94 g - 10.0 g = 2.94 g.

c) Calculate the number of moles of anhydrous salt using the molar mass of just BeSO₄.

The no. of moles of the anhydrous salt = mass of anhydrous salt/molar mass of BeSO₄ = (2.94 g)/(105.075 g/mol) = 0.02798 mol.

d) Determine the mass of water lost.

The mass of water lost = the mass of the crucible with the hydrated salt (before heating) - the mass of the crucible with the anhydrous salt (after heating) = 15.0 g - 12.94 g = 2.06 g.

e) Calculate the number of moles of water lost using the molar mass of water.

The no. of moles of water lost = the mass of water lost/molar mass of water = (2.06 g)/(18.0 g/mol) = 0.1144 mol.

f) Determine the smallest whole number ratio of moles of water : moles of anhydrous salt.

The smallest whole number ratio of moles of water : moles of anhydrous salt = The no. of moles of water lost/The no. of moles of the anhydrous salt = (0.1144 mol)/(0.02798 mol) = 4.089 mol/mol ≅ 4.0 mol/mol.

g) Did the experiment results corroborate with the formula BeSO₄.4H₂O?

Yes, the experiment results corroborate with the formula BeSO₄.4H₂O.

The original hydrate weighed 5 grams, while the anhydrous salt weighed 2.94 grams. There were 2.06 grams of water lost, and the molar ratio of water to the anhydrous salt was 4:1, confirming the formula for the hydrate.

The mass of the original hydrate can be calculated by subtracting the mass of the empty crucible from the mass of the crucible containing the hydrate. This gives you 5 grams (15.00 - 10.00).

The mass of just the anhydrous salt is calculated by subtracting the mass of the empty crucible from the mass of the crucible containing the anhydrous compound, giving 2.94 grams (12.94 - 10.00).

The number of moles of anhydrous salt can be calculated by dividing the mass of the anhydrous salt by the molar mass of BeSO4. Using a molar mass of 105.07 g/mol, the number of moles of anhydrous salt is 0.028 mol.

The mass of water lost is the difference between the mass of the original hydrate and the mass of the anhydrous salt. This gives 2.06 grams of water.

The number of moles of water lost is calculated by dividing the mass of water lost by the molar mass of water. Using a molar mass of 18.015 g/mol, the number of moles of water lost is 0.114 mol.

The smallest whole number ratio of moles of water to moles of anhydrous salt can be calculated by dividing the number of moles of each by the smaller of the two numbers. This gives a ratio of 4:1, which matches the formula for the hydrate, BeSO4 • 4H2O, confirming the results.

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Answer:

Its melting point is 17 °C.

Explanation:

So, the melting point is 17 °C.

And this is shown in the figure attached.

Answer:

A

Explanation: this is science and I'm like dis guy

C) repulsive forces between specific lone pairs of electrons. the bond angle in a water molecule is bent.

Hope it helps :)

Answer:

Explanation:

Zeff means the effective nuclear charge and it is equal to the atomic number (number of protons) less the core electrons (all the electrons less the valence electrons).

Number of core electrons is equal to the total number of protons less the number of valence electrons, so you get:

Since, the atoms are neutral, # protons = # total electrons, which yields to:

               = # total electrons - # total electrons + # valence electrons

               = # valence electrons.

So, we have found that Zeff = # valence electrons

In the image, each circle represents a different energy level, with increasing energy when you move away from the nucleus.

The image is showing that both atoms D an E have one valence electron (the only electron is the outermost energy level). Atoms with the same number of valence electrons are in the same column of the periodic table, so both atoms are in the same column and have Zeff of 1 (each circle represents a different energy level, with increasing energy when you move away from the nucleus).

Atom D has fewer energy levels, so it is above atom E in the periodic table.

Hence, you have found that the image is showing that both atoms have Zeff of 1; therefore, Atom D is above Atom E in the same column because of the additional energy level.

It would be C!

Only plants have chloroplast, they use it in the process of photosynthesis. The cell membrane is found in both plant and animal cells, though! It works to regulate whatever comes inside the cell, and it also assists in holding the cell's shape.

Answer

C

Explanation:

This is because for the first one only plant cells have chloroplasts which contain chlorophyll which is used to absorb sunlight.

The second was incorrect to because cell membranes are not present in animals cells.

The last one is incorrect because enlarged vacuoles are not present in an animals cell.

Answer:

Ca₃P₂O₈.

Explanation:

The mass of oxygen in the rock = the mass of the rock - (the mass of Ca + the mass of P) = (5.88 x 10⁻⁴ g) - (2.28 x 10⁻⁴ g + 1.18 x 10⁻⁴ g) = 2.42 x 10⁻⁴ g.

no. of moles = mass/atomic mass.

no. of moles of Ca = (2.28 x 10⁻⁴ g)/(40.078 g/mol) = 5.689 x 10⁻⁶ mol.

no. of moles of P = (1.18 x 10⁻⁴ g)/(30.97 g/mol) = 3.81 x 10⁻⁶ mol.

no. of moles of O = (2.42 x 10⁻⁴ g)/(16.0 g/mol) = 1.51 x 10⁻⁵ mol.

The mole ratio of (Ca: P: O) will be ((5.689 x 10⁻⁶ mol)/(3.81 x 10⁻⁶ mol): (3.81 x 10⁻⁶ mol)/(3.81 x 10⁻⁶ mol): (1.51 x 10⁻⁵ mol)/(3.81 x 10⁻⁶ mol)).

∴ The mole ratio of (Ca: P: O) will be (1.5: 1.0: 4.0).

Multiplying by 2.0 to get the empirical formula of the rock:

The empirical formula of the rock is Ca₃P₂O₈.

Is there a graph presented?

I need to see it in order to answer.

How do you know if a molecule has a dipole moment?

The larger the difference in electronegativity between the two atoms, the more electronegative that bond is. To be considered a polar bond, the difference in electronegativity must be large. The dipole moment points in the direction of the vector quantity of each of the bond electronegativities added together

Formula

Concentration = mols / Liters

Givens

C = 3 moles / Liter

V = 2.5 L

mols = ???

Solution

3 = mol/2.5                  Multiply both sides by 2.5

3*2.5 = mol/2.5 * 2.5  Cancel on the right. Combine on the left.

mol = 7.5

Answer: 7.5 mols

Answer:

3(NH₄)₂SO₄(aq) + 2Cr(NO₃)₃(aq) → 6NH₄NO₃(aq) + Cr₂(SO₄)₃(s)↓

Explanation:

3(NH₄)₂SO₄(aq) + 2Cr(NO₃)₃(aq) → 6NH₄NO₃(aq) + Cr₂(SO₄)₃(s)↓

3.0 moles of ammonium sulfate reacts with 2.0 moles of chromium(III) nitrate, forming 6.0 moles of ammonium nitrate and 1.0 mole of chromium(III) sulfate.

Final answer:

To find the percent composition of CrF3, divide the mass of each element by the molar mass of CrF3 and multiply by 100.

Explanation:

To calculate the percent composition of CrF3, you need to find the mass of each element in the compound and divide it by the overall mass of the compound. In this case, CrF3 consists of one chromium (Cr) atom and three fluorine (F) atoms. The atomic mass of chromium is 51.996 grams/mole and the atomic mass of fluorine is 18.998 grams/mole. Therefore, the molar mass of CrF3 is (51.996 g/mol) + 3(18.998 g/mol) = 130.988 g/mol. To find the percent composition of each element, divide the mass of each element by the molar mass of CrF3 and multiply by 100. The percent composition of Cr in CrF3 is (51.996 g/mol / 130.988 g/mol) * 100 = 39.6% and the percent composition of F in CrF3 is (3(18.998 g/mol) / 130.988 g/mol) * 100 = 54.4%.

basically all of the molecules in the can of soda started to stop moving due to the compression and change of temperature. the ice had frozen the molecules and which then made the can of soda nice and cold lol

The total amount of energy in the cooler remains the same. The warm soda transfers its heat energy to the ice, causing the soda to cool and the ice to melt. The cooler, soda, and water from the melted ice eventually reach a thermal equilibrium where they have the same temperature.

In the scenario where a student puts a warm can of soda in a cooler filled with ice, the amount of thermal energy in the cooler's system changes due to the process of heat transfer. This process follows the second law of thermodynamics which stipulates that heat tends to flow from hotter objects to colder objects until they reach equilibrium.

In this case, the warmer soda will transfer its heat to the colder ice. During this process, the ice will absorb the heat without a rise in temperature until all of it has melted. This is because this absorbed energy is used to break the bonds holding the ice molecules together in a solid state, causing a phase change to liquid water.

Simultaneously, the soda can's temperature drops as it loses heat to the ice. Eventually, everything in the cooler—the soda, the melted ice water, and the air within—will reach the same temperature, marking the achievement of thermal equilibrium. Therefore, the total amount of energy in the cooler remains the same, it's just transferred (not lost or gained). The energy initially within the can of soda is transferred to the ice, and the overall rise in the cooler’s temperature represent this energy transfer.

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There are 14 neutrons in Silicon. (neutrons are equivalent to the atomic number)

The given statement related to density is false.

Hence, the given statement is false.

Learn more about density:

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Answer:

Electronegativity difference of C and C:

0.0

covalent

Electronegativity difference of Mg and Cl:

1.8

ionic

Explanation:

When the difference in electronegativity is less than 1.5, elements generally form covalent bonds.

Electronegativity is a measure of an atom's ability to attract and hold electrons in a covalent bond. When the difference in electronegativity between two elements is less than 1.5, they generally form a covalent bond.

For the pair of elements C and C, both have the same electronegativity value of 2.5, so the electronegativity difference is 0. Since the difference is less than 1.5, C and C form a covalent bond.

For the pair of elements Mg and Cl, their electronegativity values are 1.2 and 3.0 respectively. The electronegativity difference is 1.8, which is greater than 1.5. Therefore, Mg and Cl form an ionic bond.

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The ice is completely bmelted and the water temperature is above 0 degrees Celsius.

Answer:

The ice is completely melted and the water temperature is above 0 degrees celsius

Explanation:

The initial temperature of ice is 0 degree celsius.

the mass of ice is 0.060 kg

specific heat of ice = 2.108 kJ/kg K

specific heat of water = 4.184 kJ/kg K

mass of water = 0.250 kJ/kg K

initial temperature of water = 25 degree celsius

let final temperature of both ice and water = t degree celsius.

Now to reach this temperature, the ice will melt and the temperature of water will be above 0 degree celsius.

The exchange takes place in the millions of alveoli in the lungs and the capillaries that envelop them. As shown below, inhaled oxygen moves from the alveoli to the blood in the capillaries, and carbon dioxide moves from the blood in the capillaries to the air in the alveoli.

Hope this helped

it is either C or D but i really dont know but good luck

The energy decreases as you move through the trophic levels from the bottom to the top of the energy pyramid. This is because the energy is used up by the organisms at each level. The pyramid shape is used to represent the flow of energy because of the way that energy is used up and lost throughout the system.

Answer:

The energy pyramid is one type of graphical representation of ecological relationships that is in the shape of a pyramid. The base must have the largest amount of biomass (shown as the widest bar) so it can support the energy requirements of the organisms at higher levels. Each higher level in the pyramid gets smaller (the bars get narrower) because only about 10% of the available energy transfers to the next level. The shape of the energy pyramid shows that there is enough biomass energy contained in the primary producers at the bottom to support the predators at the top, even though energy is lost at each level.

Explanation:

I wanna say D dissolves wastes and nutrients.

hope this helps

Have a great night

God bless you

- Kayla :)

Answer:

D

Explanation:

Answer:

Fir tree

Explanation:

Producers, Consumers, and Decomposers in the Forest Community. Producers are any kind of green plant. Green plants make their food by taking sunlight and using the energy to make sugar. The plant uses this sugar, also called glucose to make many things, such as wood, leaves, roots, and bark. Rabbit, Fungus, and raccoon are all decomposers!

The molar mass of NaCl is 23 + 35.5 = 58.5 g/mol, so the mass of the sample ia 0.78 × 58.5 = 45.63 g.

There is 45.58 grams of NaCl  in 0.78 moles

Moles is a measurement unit in Chemistry for measuring large number of molecules and atoms.

1 mole is equal to 6.022 * 10²³ atoms

It is calculated by dividing mass of the molecule/compound by Molar mass of the substance.

Mass of 1 mole of a substance = Molar mass of the substance

0.78 moles of NaCl = ? grams

1 mole of NaCl means 58.44 grams.

0.78 moles  = 0.78 * 58.44

0.78 moles of NaCl = 45.58 grams of NaCl

Therefore there is 45.58 grams of NaCl  in 0.78 moles.

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The answer is 0.25 g/cm3

The equation for finding density is mass divided by volume.

Therefore,

         12 grams/ 49 cm3= 0.24489795918367 gram/cubic centimeter

               you would then round this to the nearest significant figure which is the number of significant numbers you have and the highest amount of sig figs present in this equation is two sig figs. That means that you would round your answer, becasue it has a zero before the decimal which doesn't count as a significant figure, to the nearest hundredth which would be 0.25 and then you add your value after it which is g/cm3

Density = mass/volume

Density = 12g/49cm^3

Density = 0.24 g/cm^3

The answer would be, D. because ive taken the test.

Conclusions or predictions that are made by studying observations ,  Option D is the correct answer.

Inferences are the conclusions that are drawn based on evidence and reasoning.

These are made on the data available and not after proper research.

Inference are correct if there is enough evidence to back it.

It is asked in the question that what are Inferences among the option given

It can be concluded that Option D , conclusions or predictions that are made by studying observations , is the correct answer.

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Well glass and water or more heavy then air

Answer:The light ray bends more at the air-glass boundary than at the air-water boundary.

Explanation:

Got it from plato

The tilt of the Earth on its axis is what causes the seasons.