A chemical reaction is a process in which what

Products produced reactants

The law of conservation of mass applies

Combustion always occurs

None of the above

The amount of heat gained by the water is 500 calories. Thus, option D is correct.

Given:

Mass of water (m) = 100 g

Change in temperature (ΔT) = 30°C - 25°C = 5°C

The specific heat capacity of water (c) is approximately 1 calorie/gram°C.

Now, the amount of heat gained by the water,

Q = mcΔT

Where:

Q is the heat gained or lost by the substance

m is the mass of the substance

c is the specific heat capacity of the substance

ΔT is the change in temperature

Plugging in the values into the formula:

Q = 100 × 1 × 5

Q = 500 calories

Therefore, the amount of heat gained by the water is 500 calories.

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Answer:

1d and 2d is the answer. Hope it helps

Answer:

1 grams Hydrogen is equal to 0.992122546977 mole.

Explanation:

Hydrogen is equal to 0.992122546977 mole.

Answer:

11.92 Liters O₂(g) at STP

Explanation:

For most stoichiometry problems, if one will convert all given data into moles, solve by rxn ratios, then finish by converting to needed dimensions to complete problem.

2Pb(NO₃)₂ => 2PbO + 4NO₂ + O₂

Given 237.5 grams PbO formed in reaction = 237.5 g/223.2 g/mole = 1.064 mole PbO

From equation ratios, moles O₂ formed = 1/2(moles PbO) = 1/2(1.064 moles O₂) = 0.532 mole O₂

0.532 mole O₂ = 0.532 mole x 22.4  liters/mole at STP = 11.91756272 liters (calculator answer) ≅ 11.92 liters O₂ at STP (4 sig.figs. based on given 237.5g PbO)

if 1500 tons of ammonia is needed to be produced daily to meet the needs of industry mass of nitrogen must be used from the atmosphere is  6.291 gram

Ammonia has alkaline properties and is corrosive and ammonia gas dissolves easily in water to form ammonium hydroxide a caustic solution and weak base

Here given data is 1500 tons of ammonia

1 tons = 1,000,000gram so

1500 tons = 1,500,000,000 gram

We have to calculate mass of nitrogen in 1500 tons ammonia =?

So, 1500 tons/17.031g/mol = 88.074g/mol

Then 88.074g/mol/14g/mol

= 6.291 gram

Therefore mass of nitrogen must be used from the atmosphere is  6.291 gram

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(1) Bromination, (2) E2 elimination, and (3) epoxidation is formed by 1,2‑epoxycyclopentane from bromocyclopentane by dragging the appropriate formulas into the bin.

Step 1: Bromocyclopentane is reacted with hydrobromic acid and silver oxide to produce 1,2‑dibromocyclopentane.

Step 2: 1,2‑dibromocyclopentane is then reacted with a base, such as sodium hydroxide, to produce 1,2‑epoxycyclopentane.

Step 3: Finally, the 1,2‑epoxycyclopentane is reacted with aqueous acid to form 1,2‑epoxycyclopentane.

Bromocyclopentane responds with sodium methoxide to frame tertiary liquor, sulfated with sulfuric acid, then treated with base to yield 1,2-epoxy cyclopentane.

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The volume produced from the reaction of 4. 95 L of ethane will be 14.85L.

The volume of a gas is precisely proportional to its moles according to Avogadro's law.

According to the equation:

2C₂H₆(g) + 7O₂(g) → 4CO₂(g) + 6H₂O(g)

2 moles of ethane form 6 moles of H₂O.

according  Avogadro's law: 2L of ethane produce 6L of H₂O.

If it reacted from 4.95 liters of ethane

so,

4.95L ethane x (6L of water / 2L of C2H6) = 14.85 liters of water are created.

According to Avogadro's law, equal volumes of gases contain an equal number of moles under constant pressure and temperature: V/n = unchanging

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the half-reactions

cathode : Zn²⁺ (aq) + 2e⁻ ---> Zn (s)  

anode : Mg (s) → Mg²⁺ (aq) + 2e−

a balanced cell reaction

Zn²⁺(aq) + Mg(s)→ Zn(s) + Mg²⁺ (aq)

Given

Zn and Mg electrodes

Required

The half-reactions for a galvanic cell

Solution

To determine the reaction of a voltaic cell, we must determine the metal that serves as the anode and the metal that serves as the cathode.

To determine this, we can either know from the standard potential value of the cell or use the voltaic series

1. voltaic series

Li-K-Ba-Ca-Na-Mg-Al-Mn- (H2O) -Zn-Cr-Fe-Cd-Co-Ni-Sn-Pb- (H) -Cu-Hg-Ag-Pt-Au

The more to the left, the metal is more reactive (easily release electrons) and the stronger reducing agent

So the metal on the left will easily undergo oxidation and function as anode

Since Mg is located to the left of Zn, then Mg functions as anode and Zn as a cathode

2. Standard potentials cell of Mg and Zn metals :

Mg2+ + 2e– → Mg E° = -2,35 V

Zn2+ + 2e– → Zn E° = -0,78 V

The anode has a smaller E°, then Mg is the anode and Zn is the cathode.

Answer:

Explanation:help

The age of a skeleton can be determined by measuring the amount of carbon-14 present in the remains. Carbon-14 is a radioactive isotope of carbon that undergoes decay over time. In this case, the skeleton has lost 19% of its carbon-14.
The decay rate, k, of carbon-14 is given as 0.01205% per year.

This means that each year, the amount of carbon-14 in the skeleton decreases by 0.01205% of the remaining amount.
To find the age of the skeleton, we can use the formula for exponential decay: N(t) = N0 * e^(-kt). Since we know that the skeleton has lost 19% of its carbon-14, the remaining amount is 100% - 19% = 81% of the initial amount. Therefore, N(t) = 0.81 * N0. Substituting these values into the formula, we have: 0.81 * N0 = N0 * e^(-0.01205t). Dividing both sides by N0, we get: 0.81 = e^(-0.01205t)

To solve for t, we take the natural logarithm (ln) of both sides: ln(0.81) = -0.01205t. Now we can solve for t: t = ln(0.81) / -0.01205. Using a calculator, we find that t is approximately 137.51 years. Therefore, the skeleton is estimated to be around 137.51 years old based on the 19% loss of carbon-14 and the given decay rate.

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The molar mass of insulin is approximately 0.798 g/mol, calculated using the equation for osmotic pressure and the given values of mass and volume.

To calculate the molar mass of insulin, we can use the equation for osmotic pressure:

π = (n/V)RT

where π is the osmotic pressure, n is the number of moles of solute, V is the volume of the solution in liters, R is the ideal gas constant, and T is the temperature in Kelvin.

First, convert the given values to appropriate units:

25.0 mg = 0.025 g
5.00 mL = 0.005 L

Next, rearrange the equation to solve for n (number of moles):

n = (πV) / (RT)

Substituting the given values:

n = (15.5 mmHg * 0.005 L) / ((0.0821 L·atm/(mol·K)) * 298 K)

Calculate n:

n ≈ 0.0313 mol

Finally, divide the mass of insulin (0.025 g) by the number of moles (0.0313 mol) to find the molar mass:

Molar mass = 0.025 g / 0.0313 mol

Molar mass ≈ 0.798 g/mol

So, the molar mass of insulin is approximately 0.798 g/mol.


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The elements arranged in increasing order of the most positive electron affinity for each group are:

(a) Li, Na, K

(b) I, Br, Cl, F

(c) Ba, Ca, Si, P, O

(a) Li, Na, K: In this group, the electron affinity increases as we move from left to right in the periodic table. Therefore, the elements arranged in increasing order of the most positive electron affinity are Li, Na, and K.

(b) F, Cl, Br, I: In this group, the electron affinity generally increases as we move from left to right and from bottom to top in the periodic table. Therefore, the elements arranged in increasing order of the most positive electron affinity are I, Br, Cl, and F.

(c) O, Si, P, Ca, Ba: In this group, the electron affinity generally increases as we move from left to right and from top to bottom in the periodic table. Therefore, the elements arranged in increasing order of the most positive electron affinity are Ba, Ca, Si, P, and O.

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Answer:

rest until and unless an external force is applied.

The property of matter that is conserved in chemical reactions and shown by balanced equations is known as the Law of Conservation of Mass. According to this law, mass can neither be created nor destroyed in a chemical reaction; it can only be transformed from one form to another.For instance, when two substances are combined, they react and form a new substance.

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The set containing all equivalent numbers is {0.100, 0.010, 10%, 1/10}.

This is because 0.100 is equal to 10%, which is equal to 1/10. Similarly, 0.010 is equal to 1% or 1/100. The other sets do not contain all equivalent numbers. For example, the set (0.75, 12, 3, 25, 4) contains numbers with different values and units, and there is no clear equivalence between them.

The set (0.100, -15%, 0.010) contains numbers with different signs and units, and there is no clear equivalence between them. Finally, the set (75%, 5, 50, 35%, 0.35, 36%, 0.360, 35, 100, 18, 50) contains numbers with different units and no clear equivalence between them. Therefore, the set {0.100, 0.010, 10%, 1/10} is the only set that contains all equivalent numbers.

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Answer:

inside cells are removed

Answer:

They then put a balloon on top of the bottle immediately after adding them together. The student observed that the balloon inflated and got larger.

Explanation:

Btw brainliest me plss

Answer:

The student's prediction is wrong.  Mass cannot be spontaneously created.

Explanation:

Sorry, but all the other answers are wrong. They didn't even come close to answering your question. This question concerns ourselves with the law of mass conservation. This states that, in a reaction, the total mass of the reactants must equal the total mass of products formed after the reaction. For instance, if the mass of the reactants both weighed 5 grams, then the products, if you measured their weight afterwards, would be 5 grams. The reaction does not generate new mass at the end of the reaction, this cannot be done for any reaction, let alone this one. Thank you!

Answer:

Bcoz the carcinogenes  damage the genome or to the disruption of cellular metabolic processes

Explanation:

Answer:

Carcinogens may increase the risk of cancer by altering cellular metabolism or damaging DNA directly in cells, which interferes with biological processes, and induces the uncontrolled, malignant division, ultimately leading to the formation of tumors.

Explanation:

Two approaches to calculate the number of carbon monoxide molecules in 45 pg are using Avogadro's number or molar mass.

1) Approach using Avogadro's number:

Determine the molar mass of carbon monoxide (CO). The molar mass of carbon is approximately 12.01 g/mol, and the molar mass of oxygen is approximately 16.00 g/mol. Therefore, the molar mass of carbon monoxide (CO) is: 12.01 g/mol (carbon) + 16.00 g/mol (oxygen) = 28.01 g/mol

Convert the given mass of carbon monoxide to moles. 45 pg = 45 x 10⁻¹² g (since 1 pg = 10⁻¹²  g) moles = mass / molar mass moles = 45 x 10⁻¹²  g / 28.01 g/mol

Calculate the number of molecules using Avogadro's number. Avogadro's number states that there are 6.022 x 10²³ molecules in one mole of a substance. Number of molecules = moles x Avogadro's number of molecules = (45 x 10⁻¹²  g / 28.01 g/mol) x (6.022 x 10²³ molecules/mol)

Approach using molar mass

Determine the molar mass of carbon monoxide (CO). The molar mass of carbon monoxide (CO) is calculated as 28.01 g/mol (as explained in Approach 1).

Convert the given mass of carbon monoxide to moles. 45 pg = 45 x 10⁻¹² g (since 1 pg = 10⁻¹²  g) moles = mass / molar mass moles = 45 x 10⁻¹²  g / 28.01 g/mol

Use stoichiometry to calculate the number of molecules. The balanced chemical equation for carbon monoxide (CO) is: 1 mole of CO = 6.022 x 10²³molecules of CO

Since the stoichiometry is 1:1, the number of molecules is equal to the number of moles. Number of molecules = 45 x 10⁻¹²  g / 28.01 g/mol

Both approaches involve using the molar mass of carbon monoxide and Avogadro's number to convert mass to moles and then to molecules.

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Chemicals are not supposed to be poured down the drain.

Chemicals should not be poured down the drain. This can cause harm to the plumbing system, sewage treatment plants, and the environment. Dispose of household chemicals properly by taking them to a designated recycling center or household hazardous waste collection event.

Thus the action that have been undertaken by Thomas and Trenton  is quite wrong since the chemicals that they have poured down the drain could lead to an environmental hazard.

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Answer:

Potassium

Explanation:

In group one of the periodic table both the melting and the boiling points usually decrease down the group.

Now, down the group, it's lithium that comes first, then sodium, then potassium.

Thus, among the 3, potassium is furthermost down the group by virtue of the factor it has the highest atomic number.

Therefore, we can say that potassium has the lowest boiling point among the 3.

Answer: C

Explanation:

Answer:

C. the car is moving slowly

The chemical formula for the cation presents in the aqueous solution of Pb NO3 2 is Pb2+.  The chemical formula for the cation presents in the aqueous solution of Pb NO3 2 is Pb²⁺. In this formula, "Pb" represents the element lead and indicates its positive charge. Coefficients and phases are not included in the response as requested.

The chemical formula for the cation presents in the aqueous solution of NH4 2CO3. Express your answer as a chemical formula. Do not include coefficients or phases in your response.  Submit Previous Answers Request Answer X Incorrect Try Again 8 attempts remaining Part Complete previous part.  Solving for u we find u dt u 60 Is this the only solution Is this a solution to u 1.5 u 60 We define the general solution as but what do all the solutions together look like What does this figure show? The additional piece of information such as u 60 is called an If 60, then the solution is which is called an solution.

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Answer:

Explanation:

A precipitation reaction occurs upon the mixing of two solutions of ionic compounds when the ions present together in the mixture can form an insoluble compound. In such cases, the solution turns visibly cloudy, a phenomenon known as precipitation.

A set of particles (atoms or molecules) that are constantly moving at random makes up a gas sample, according to the kinetic energy of a  molecular theory.

Moreover, these gas particles' average kinetic energy solely depends on the temperature of the gas. With an increase in gas temperature, the average kinetic energy rises (this tells that the fifth statement is true). Despite the fact that certain gas molecules will always be travelling more quickly than others, the gas can still be represented by its average kinetic energy. Because kinetic energy is proportional to the square of the speed, the second claim—that the average speed of gas molecules rises with rising temperature—is derived from this.

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Answer:

A covalent bond is formed when the difference of electronegativity between two atoms is between 0.0-2.0.

B

the Earth is eccentric,this means that it has changed repeatedly over time

And if it took the earth more time to orbit round the sun than it does now the years would have more than Han 365 days a year