when the following molecular equation is balanced using the smallest possible integer coefficients, the values of these coefficients are: nitrogen (g) + hydrogen (g) → ammonia (g) submit answer

Answer:

Long term radioactive dating such as in dating rocks

Explanation:

If we examine the graph carefully, we will notice that the number of atoms falls to zero after about 40000 years. This is quite a long time! Many rock formations were formed thousands of years ago and their ages can only be measured by an isotope that has an equally long half life.

Hence for an isotope with such a long half-life, we can effectively measure the age of a rock formation that contains the particular isotope in question. Rocks are composed of diverse chemical isotopes which are normally used to determine the age of the rock formation. Since rocks were formed thousands of years ago, these isotopes must be capable of having a half-life of thousands of years also in order to be useful in measuring the age of rocks.

The balanced equation for this reaction can be written as follows: Mg + 2HCl → MgCl2 + H2

The reaction between magnesium (Mg) and hydrochloric acid (HCl) produces magnesium chloride (MgCl2) and hydrogen gas (H2).

Let's go through the process of balancing the equation step by step:

Write down the chemical formulas for the reactants and products.

Mg + HCl → MgCl2 + H2

Count the number of atoms for each element on both sides of the equation.

Left side: 1 Mg, 1 H

Right side: 1 Mg, 2 Cl, 2 H

Start balancing the equation by adjusting the coefficients.

Since there is one Mg atom on each side, the coefficient for Mg remains 1.

Now, let's balance the hydrogen atoms. There are two H atoms on the right side but only one on the left side. To balance them, we need to place a coefficient of 2 in front of HCl.

Mg + 2HCl → MgCl2 + H2

Now, check the chlorine atoms. There are two Cl atoms on the right side, which means we need two HCl molecules to provide enough Cl atoms. So, the equation is already balanced in terms of chlorine.

Double-check all the atoms to ensure the equation is balanced:

Left side: 1 Mg, 2 H, 2 Cl

Right side: 1 Mg, 2 Cl, 2 H

The equation is now balanced, with the same number of atoms on both sides.

Thus, the balanced equation for the reaction between magnesium and hydrochloric acid is:

Mg + 2HCl → MgCl2 + H2

In this reaction, magnesium displaces hydrogen from hydrochloric acid, resulting in the formation of magnesium chloride and the evolution of hydrogen gas. It is a classic example of a metal-acid reaction and is often observed in chemistry demonstrations due to the effervescence of hydrogen gas.

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Answer: I mean I guess but then why don't we have dinosaurs now be reasonable next time thanks.

Explanation:

The required mass of water vaporized is 15.5 grams, from a 250 gram sample of water at the boiling point had 35.0 kj

Given: Mass of water (m) = 250 gHeat added (q) = 35.0 kJHeat of vaporization (ΔHvap) = 40.6 kJ/mole

To find:Mass of water vaporized (x) Formula:q = ΔHvap × nx = (q / ΔHvap) × nMass = moles × molar mass

We know that molar mass of water (H2O) = 18 g/molMoles of water vaporized (n) = (35.0 kJ / 40.6 kJ/mol) = 0.861 mol

Therefore,Mass of water vaporized (x) = 0.861 mol × 18 g/mol= 15.5  

Detailed Solution: According to the given statement,250g of water was taken at its boiling point and 35.0 kJ of heat was added to it, we need to find how many grams of water were vaporized. To solve this question, first, we need to know the heat of vaporization for water, which is 40.6 kJ/mole. It means to vaporize 1 mole of water, 40.6 kJ of heat is required.

Mass of water (m) = 250 g Heat added (q) = 35.0 kJHeat of vaporization (ΔHvap) = 40.6 kJ/molen = q / ΔHvapn = (35.0 kJ / 40.6 kJ/mol) = 0.861 molMoles of water vaporized (n) = 0.861 mol

Therefore, Mass of water vaporized (x) = 0.861 mol × 18 g/mol= 15.5 g Hence, the required mass of water vaporized is 15.5 grams.

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Answer:

-175.15

Explanation:

1.0 °C = 274.15 K

2.0 °C = 275.15 K

3.0 °C = 276.15 K

4.0 °C = 277.15 K

5.0 °C = 278.15 K

6.0 °C = 279.15 K

7.0 °C = 280.15 K

8.0 °C = 281.15 K

9.0 °C = 282.15 K

As we add a base to an acidic solution, the pH of the solution increases.

The pH will continue to increase as we add more base until it reaches a certain point where the amount of base added is stoichiometrically equivalent to the amount of acid present in the solution. At this point, the pH of the solution will be at its highest point, known as the equivalence point.

At the equivalence point, all the acid has reacted with the base, and the solution contains only the salt and water formed by the reaction. The pH of the solution at the equivalence point will depend on the strength of the acid and base used.

The reason for the increase in pH as we add base is due to the neutralization reaction that takes place between the acid and the base. The acid donates a proton (H⁺) to the base, which accepts the proton and becomes a conjugate acid. This reaction reduces the concentration of H⁺ ions in the solution, which causes the pH to increase.

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Answer:

C- transforemed or changed

Explanation:

matter can be changed by application of heat or cold

Answer:

independent variable -- different batteries

dependent variable -- the time that clock stop

Explanation:

In an experiment or a research study, there are two type of variables that can affect the result of the experiment or the conclusion. They are independent variable and the dependent variable.

An independent variable may be defined as that variable in an experiment which can be changed or can be controlled in the scientific experiment in order to test the effect on the dependent variable. It cannot be changed by other variables.

On the other hand, dependent variable are those are those which can be altered or change that can affect the experiment.

In the context, Emily uses  the different types of the batteries as an independent variable and the time where the clock stopped in the dependent variable in her research.

The only factor affecting the average kinetic energy of a group of gas particles is its temperature.

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From the balanced equation below the mole ratio of PCl3 to PCl5 is 1:1

\(PCl_{5} + PCl_{5}\) -------------------> \(PCl_{5}\)

Number of moles of \(PCl_{3}\) can be expressed as  1 mole

Number of moles of  \(Cl_{2}\) can be expressed as 1 mole

Number of moles of  \(PCl_{5}\) can be expressed as 1 mole

Mole ratio of \(PCl_{5}\) can be expressed as 1:1

The ratio of the mole quantities of any two compounds present in a balanced chemical reaction is known as the mole ratio. A comparison of the ratios of the molecules required to accomplish the reaction is given by the balancing chemical equation.

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Answer:

+3

Explanation:

Let's consider the chemical formula XN. It must be formed by a cation coming from X and an anion coming from N. Nitrogen has only one negative charge: -3. We know, that the sum of the charges of the elements that form a compound is equal to the charge of the compound. considering XN is a neutral compound (charge 0), we can use this information to calculate the charge of X.

X + N = 0

X + (-3) = 0

X = +3

Prediction 1 best shows what the population could look like after many generations. Because, the long beak traits is having more life time.

Each characteristics in a living thing is created by a respective genetic coding in its body. The genetic code which is responsible for a particular behavior or appearance is called a genetic trait.

Here, the prediction 1 is best . It already saying that long-beak hummingbirds are more likely to survive, that baby survived long enough to pass on its mutation, so the long-beak trait became more common over generations.

Prediction 2 says abut a  genetic trait which is less fit to survive. Hence, cannot affect the next generation population. Therefore, prediction 1 is best.

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Your question is incomplete. But your complete question probably was:

Prediction 1 :Two hummingbirds with short or medium beaks had a baby with a mutation in its genes for the long-beak trait.

Prediction 2 is best. A hummingbird could have been born with a mutation in its genes for the long-beak trait and lived for a little while.

Answer:

true

downstream to the riverbed. However, the most common mechanism to produce older rocks on top of younger is by thrust faulting. Thrust faults form where rocks are being compressed, usually by plate tectonic mechanisms. Thrust faults rip up older strata and pile it on top of younger rocks.

Explanation:

Time taken by students of different ages to finish the same puzzle is an independent variable whereas the amount of coffee grounds that affect the taste is a dependent variable.

One of the most important aspects of scientific study is establishing the cause and effect relationships. Knowing which variable is the cause, or independent variable, and which is the effect, or dependent variable, is crucial. Here time taken by students of different ages to finish the same puzzle differs for each student and each student's time taken is independent of other, so it is a independent variable. But the taste of coffee is an effect which depends on the amount of coffee grounds used, so it is a dependent variable

Time taken by students of different ages to finish the same puzzle is an independent variable whereas the amount of coffee grounds that affect the taste is a dependent variable.

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Answer: I believe it’s element symbols

Explanation: I hope we both get it right

d. all of the above

AnswerD:

Explanation:

Answer:

8 valence electrons

Explanation:

Neon is a noble gas, and all noble gases have 8 valence electrons. The same goes for its group; all elements in the last group of the periodic table have a full valence shell--8 electrons.

Answer:

Explanation:

It occurs as the mineral fluorite (also called fluorspar), which is often deeply coloured owing to impurities. ... Calcium reacts with fluorine to form the compound CaF2. ... (lead is very close) as hydrogen the bond would be considered ionic! ... What is the most stable monatomic ion formed from nitrogen?

Answer:

CaF2 is stable when it is formed because Ca loses two of its electrons. Both accept one electron each. now the Calcium is satisfied because it lost its two electrons and is now behaving like a noble gas, which is what they all want to be like The Flourine is satisfied because they both gained one electron, allowing them to have 8 valence electrons also like a noble gas.

The key is in the 8 valence electrons! Ca has to lose two to have 8, and F has to gain one to have 8fluorinefluorines...

Explanation:

In the long version of the Periodic table, the elements Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Caesium (Cs), and Francium (Fr) collectively make up one group. Because their oxides and hydroxides are soluble in water and produce a potent alkaline (basic) solution, these metals are collectively referred to as alkali metals.

Alkali metals' distinctive flame colors—red, yellow, violet, crimson, and blue for Li, Na, K, Rb, and Cs, respectively—are qualitative markers of the contemporary analytical techniques used to calculate the quantities of alkali-metal salts in aqueous solution.

Most other metals are harder than alkali metals. The most reactive elements in this category are cesium and francium.

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When antacid reacts with HCl to produce H2CO3 it produce fizzy gas react due to a double displacement reaction.

Table salt and carbonic acid are produced in a two fold displacement process when hydrochloric acid and antacid are combined. Additionally, due to the instability of carbonic acid, it will decompose into water and carbon dioxide, emitting a "fizzy" gas.

Strong acid hydrochloric acid is denoted by the chemical formula HCl. The primary ingredient in antacids is sodium bicarbonate, sometimes known as baking soda and has the chemical formula NaHCO3.

Antacid undergoes a chemical reaction when it reacts as a carbonate with powerful acids like hydrochloric acid to create compounds with a different chemical makeup from the beginning components. Similar reactions will be produced by other carbonates, such as calcium carbonate, which makes up the majority of Tums.

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Answer: Rusting Photosynthesis

Explanation: Hope this helps

The angular momentum of an electron in the third Bohr orbit of a hydrogen atom is given by mvr=3h÷2π

Momentum is defined as the amount of motion occurring in something that is moving, or the force that drives something forward to keep it moving.

Bohr never assumed stable electronic orbits with the electronic angular momentum quantized as

l=mvr = \(\frac{nh}{2pi}\)

Quantization of angular momentum means that the radius of the orbit and the energy will be quantized as well.

Bohr assumed that the discrete lines seen in the spectrum of the hydrogen atom were due to transitions of an electron from one allowed orbit/energy to another.

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The mass percent of NaHCO₃ in an Alka Seltzer tablet is approximately 32.15%.

To calculate the mass percent of NaHCO₃ in an Alka Seltzer tablet, we need to know the mass of NaHCO₃ and the mass of the entire Alka Seltzer tablet. Let's assume that the mass of an Alka Seltzer tablet is 3.40 g, and that it contains 1.00 g of NaHCO₃.

Using the formula for mass percent, we can calculate:

mass percent = (mass of NaHCO₃ / mass of Alka Seltzer) x 100

mass percent = (1.00 g / 3.40 g) x 100

mass percent = 29.41%

Therefore, the mass percent of NaHCO3 in an Alka Seltzer tablet is approximately 29.41%. However, this calculation assumes that the only ingredient in the tablet is NaHCO₃, which is not true. In reality, Alka Seltzer tablets contain other ingredients as well, so the actual mass percent of NaHCO₃ in a tablet may differ from this calculated value.

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To determine the categorization of each solution of Er₂(SO₄)₃, we need to compare the concentration of Er₂(SO₄)₃ in each solution with its solubility at 20 °C, which is given as 137.6 g/L H₂O.

If the concentration of Er₂(SO₄)₃ in a solution is less than 137.6 g/L H₂O, the solution is unsaturated. This means that more solute can dissolve in the solvent.
If the concentration of Er₂(SO₄)₃ in a solution is exactly 137.6 g/L H₂O, the solution is saturated. This indicates that the maximum amount of solute has dissolved in the solvent at that temperature.
If the concentration of Er₂(SO₄)₃ in a solution exceeds 137.6 g/L H₂O, the solution is supersaturated. This occurs when the solute concentration is higher than the equilibrium solubility, usually achieved through cooling or evaporation.
By comparing the concentration of Er₂(SO₄)₃ in each solution with the given solubility of 137.6 g/L H₂O, you can categorize each solution as unsaturated, saturated, or supersaturated accordingly.

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Answer:

Absolute temperature and 100% accurate

Explanation:

Answer:

Absolute temp is measured on a scale in which the hypothetical lowest limit of physical temperatures is assigned the value zero (absolute zero )

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Answer:

the degree of ionization in water is high

Explanation:

The term pH is defined as the negative logarithm of hydrogen ion concentration.

Hence;

pH = -log[H^+]

The pH scale shows the degree of acidity or alkalinity of a solution. A solution of pH 1 is a strong acid. A strong acid dissociates completely in solution.

Hence, acid U has a high degree of ionization in water.

15 moles of O2 are required to generate 12 moles of SO2 gas. From the balanced chemical equation:

2CuFeS2 + 5O2 → 2Cu + 2FeO + 4SO2

We can see that for every 4 moles of SO2 produced, 5 moles of O2 are required. This is based on the stoichiometric coefficients of the reactants and products in the equation.

Therefore, if we want to generate 12 moles of SO2 gas, we need to determine how many moles of O2 are required.

Using a proportion:

4 moles of SO2 corresponds to 5 moles of O2

12 moles of SO2 corresponds to x moles of O2

We can set up the proportion:

4/5 = 12/x

Cross-multiplying:

4x = 5 * 12

4x = 60

Dividing both sides by 4:

x = 60/4

x = 15

So, 15 moles of O2 are required to generate 12 moles of SO2 gas.

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