C14 is another radioactive substance with a half-life of 5730 years. If a mammoth died with
2000 grams of C14 and then its fossilized bones were found to have just over 250 grams of
C14, how old is the fossil?
a) 5730 years
c) 17,190 years
d) impossible to tell
b) 11,460 years

Answer:

The correct answer is (B) Oxygen is usually -2.

Explanation:

I did this test last week lol ;)

Answer:

In the elemental form, non-metals can be gas, liquid or solid. They aren't shiny (lustrous) and they don't conduct heat or electricity well. Usually their melting points are lower than for metals, although there are exceptions. The solids usually break easily, and can't bend like metals

Explanation:

To calculate the theoretical yield of potassium alum, we need to determine the number of moles of aluminum present in the 1.16 g sample and then use the stoichiometry of the reaction to find the corresponding number of moles of potassium alum.

Therefore, the theoretical yield of potassium alum that could be obtained in the reaction is approximately 10.23 grams.

First, we calculate the number of moles of aluminum using its molar mass:

Number of moles of aluminum = Mass of aluminum / Molar mass of aluminum

= 1.16 g / 26.98 g/mol (molar mass of aluminum)

≈ 0.043 moles

Next, we use the balanced chemical equation for the reaction between aluminum and potassium alum to find the mole ratio between aluminum and potassium alum. The balanced equation is:

2 Al + K2SO4 · Al2(SO4)3 + K2SO4

From the balanced equation, we see that 2 moles of aluminum react to form 1 mole of potassium alum.

Therefore, the theoretical yield of potassium alum is:

Theoretical yield = Number of moles of aluminum * (1 mole of potassium alum / 2 moles of aluminum)

= 0.043 moles * (1 mole / 2 moles)

= 0.0215 moles

Finally, we convert the number of moles of potassium alum to grams using its molar mass:

Theoretical yield in grams = Theoretical yield in moles * Molar mass of potassium alum

= 0.0215 moles * 474.39 g/mol (molar mass of potassium alum)

≈ 10.23 g

Therefore, the theoretical yield of potassium alum that could be obtained in the reaction is approximately 10.23 grams.

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The concentration of commercial hydrogen peroxide is 0.05 g/mL.

We must measure the amount of hydrogen peroxide (in grams) present per unit volume (in mL) of the solution.

5.0 g of hydrogen peroxide are used in 100 mL of solution, which is the concentration.

We can divide the numerator and denominator by 100 to get the concentration per 1 mL:

5.0 g / 100 mL = 0.05 g/mL

Therefore, the concentration of commercial hydrogen peroxide is 0.05 g/mL.

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The percentage yield is equal to 200.6%.

The balanced equation for the given chemical reaction is :

2C2H + 5O2 → 4CO2 + 2H2O

Let's find the limiting reagent:

Mass of C2H = 120 g

Mass of O2 = 288 g

Molar mass of C2H = 26 g/mol

Molar mass of O2 = 32 g/mol

The number of moles of C2H is equal to:

120 g × 1 mol/26 g = 4.62 mol

The number of moles of O2 is equal to:

288 g × 1 mol/32 g = 9 mol

According to the stoichiometry of the balanced equation, 2 moles of C2H react with 5 moles of O2, so:

If 4.62 moles of C2H is used, then the required amount of O2 would be:

5/2 × 4.62 mol = 11.6 mol

We only have 9 mol of O2 which means it is the limiting reagent.

C2H is the excess reagent.

Let's find the mass of water produced:

According to the stoichiometry of the balanced equation,2 moles of H2O is produced per 2 moles of C2H2 moles of H2O is produced per 5 moles of O2If 9 mol of O2 is used, the number of moles of water produced would be:

2/5 × 9 mol = 3.6 mol

The mass of water produced is equal to:

3.6 mol × 18 g/mol = 64.8 g

Therefore, 64.8 g of water can be produced.

The amount of excess reagent is equal to:

4.62 mol - 2/2 × 9 mol = 4.62 - 9

= -4.38 mol

C2H is the excess reagent and it is not possible to have negative amount of a substance.

So, we assume that there is no excess reagent.

If 130 grams of water is produced, then the percentage yield is equal to:

Percent yield = actual yield/theoretical yield × 100

Theoretical yield is equal to 64.8 g

Actual yield is equal to 130 g

Percent yield = 130/64.8 × 100

= 200.6%

Therefore, the percentage yield is equal to 200.6%.

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Answer:

Nitric acid is most commonly seen in the production of fertilizers for plants and grass

Explanation:

as it neutralizers with ammonia to form ammonium nitrate

Answer:

nitric acid include woodworking, rocket propulsion, metal finishing, and sanitizing.

Explanation:

The highly corrosive and oxidizing acid can also be used for dyes and certain kinds of explosives, since nitric acid can produce potentially explosive hydrogen gas when combined with some common metals.

The density of water is approximately 1 g/mL. The liquid with a density of 4 g/mL would definitely sink in water since the liquid's density (4 g/mL) is greater than the density of water.

The density of the liquid can be calculated by dividing its mass by its volume. So, the density of the liquid is 4 g/mL (200 g ÷ 50 mL).

Whether the liquid would float on water or not depends on the density of water. If the density of water is less than 4 g/mL, then the liquid would sink in water. However, if the density of water is more than 4 g/mL, then the liquid would float on water. The density of water is approximately 1 g/mL, so the liquid with a density of 4 g/mL would definitely sink in water.

Alternatively, to find the density of the liquid, we will use the formula:

Density = Mass / Volume

Given the mass of the liquid is 200 grams and the volume is 50 milliliters, we can plug these values into the formula:

Density = 200 grams / 50 milliliters = 4 grams per milliliter (g/mL)

Now, to determine if the liquid would float on water, we need to compare its density to that of water. The density of water is approximately 1 g/mL. Since the liquid's density (4 g/mL) is greater than the density of water, it will not float on water, and will instead sink.

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Carbohydrates require carbon as their primary component. There is carbon in every known carbohydrate. All carbohydrates also contain hydrogen and oxygen atoms, with the exception of a few simple sugars, which only contain carbon and hydrogen atoms.

Carbon, hydrogen, and oxygen atoms make up the macromolecules known as carbohydrates. They are a significant energy source. They can be found in fruits and vegetables as sugars, starches, and fibre. What categories do the carbs fit into? Starchy meals are complex carbohydrates because they include two or more sugar units. Compared to simple carbs, complex carbohydrates' molecules digest and transform more slowly. They are widely distributed in whole-grain bread, cereals, lentils, beans, peanuts, potatoes, peas, and corn. As one of the three primary macronutrients, carbohydrates are one of the three.

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Answer:

Freezing and condensation

Explanation:

Because they are exothermic, they release energy

Answer:

c. A nucleus with a large mass will be on the left side, and there will be neutrons in the equation.

Explanation:

In the process of nuclear fission, a neutron collides with a nucleus with a large mass and that nucleus splits into isotopes (substances that have the same atomic number that the original substance, but different weight number).

In this case, the nucleus with a large mass is U and n represents the neutrons.

Answer: 20 g

Explanation: heat received Q = m c dT

Q= 50J , dT= 25 C anc c= 0.10 J / g C

And m = Q / c dT

The mass of the iron sample that received the heat is determined as 20 g.

The mass of the iron sample is calculated as follows;

Q = mcΔT

where;

m = Q/cΔT

m = (50) / (0.1 x 25)

m = 20 g

Thus, the mass of the iron sample that received the heat is determined as 20 g.

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0.250 M solutions of HNO2 and CH3CO2H contain the major species H3O+, NO2- and CH3COOH, respectively, and the pH of each solution is equal to -log(0.250) = -(-2) = 2.

The major species present in 0.250 M solutions of HNO2 and CH3CO2H (HC2H3O2) are H3O+, NO2- and CH3COOH, respectively.

The H3O+ ion is the proton (H+) of the acid, while NO2- and CH3COOH are the conjugate base and acid, respectively.

The pH of the solution can be calculated by taking the negative logarithm of the concentration of H3O+ ions.

In the case of HNO2, the concentration of H3O+ ions is equal to the concentration of the acid, so the pH of the solution would be equal to -log(0.250) = -(-2) = 2.

Similarly, the pH of the solution of CH3CO2H is equal to -log(0.250) = -(-2) = 2.

It is important to note that in 0.250 M solutions of both HNO2 and CH3CO2H, the concentration of the conjugate base (NO2- and CH3COOH, respectively) is equal to the concentration of the acid.

This is because the dissociation of both acids is 100%.

To summarize, 0.250 M solutions of HNO2 and CH3CO2H contain the major species H3O+, NO2- and CH3COOH, respectively, and the pH of each solution is equal to -log(0.250) = -(-2) = 2.

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Answer:

Explanation:

A

Specialized periodicals in which scientists publish the results of their works are called scientific journals.

In educational publishing, a scientific journal is a periodical book intended to similarly the progress of technology, typically by way of reporting new studies.

Journal articles may include original research, re-analyses of studies, opinions of literature in a selected place, proposals of new but untested theories, or opinion pieces.

These scientific journals include the following.

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After considering the given the data we conclude that the  ionization energy generally increases from left to right across a period. Therefore, the element with the highest ionization energy in period 3 would be located on the right side of the periodic table.

We can also see from the search results that helium has the highest ionization energy of all the elements, while sodium has the lowest ionization energy in period 3. Therefore, we can conclude that the element with the highest ionization energy in period 3 is located to the right of sodium.
Based on the periodic table, we can see that the elements in period 3 are:
Sodium (Na)
Magnesium (Mg)
Aluminum (Al)
Silicon (Si)
Phosphorus (P)
Sulfur (S)
Chlorine (Cl)
Argon (Ar)
Therefore, the element with the highest ionization energy in period 3 is most likely Argon (Ar), which is located on the far right side of the period.
In summary, the element with the highest ionization energy in period 3 is most likely Argon (Ar).
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Answer:

A)strong and concentrated

Explanation:

I think. I haven't done chemistry since high school!

Answer:

Hello! Your answer would be (A)

Explanation: Hope this helped you out!

While picking up a buret, an unknown solution left by a previous solution drips onto your hand - Gloves

While pulling an empty beaker off the shelf at the beginning of lab, it slips out of your hand onto the floor - Closed-toe shoes

While checking on a stirring solution, the solution splashes up towards your face - Goggles

While transferring a solution from a flask to a beaker, the solution accidentally spills down the front of the lab bench - Lab coat

Explanation:

So, according to the question. the matches will be:

While picking up a buret, an unknown solution left by a previous solution drips onto your hand - Gloves

While pulling an empty beaker off the shelf at the beginning of lab, it slips out of your hand onto the floor - Closed-toe shoes

While checking on a stirring solution, the solution splashes up towards your face - Goggles

While transferring a solution from a flask to a beaker, the solution accidentally spills down the front of the lab bench - Lab coat

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First, let's remember the formula to calculate an object's density:

Then, we analyze what we have:

We need to determine the volume, so we transform our formula like this:

We replace our data:

Then, the answer is that the volume equals 12.4 cm^3.

Answer:0

Explanation: zero because it is the most stable form of oxygen in its standard state

  - True: Chemical cycling involves the recycling of nutrients and elements within ecosystems.
  - True: Energy flow refers to the transfer of energy from one organism to another in an ecosystem.

  Chemical cycling is a vital process in ecosystems as it allows nutrients and elements such as carbon, nitrogen, and phosphorus to be reused. These elements are taken up by organisms, incorporated into their tissues, and then released back into the environment through processes like decomposition and excretion.

This continuous cycling ensures the availability of essential nutrients for different organisms in the ecosystem. Energy flow, on the other hand, describes how energy is transferred between organisms within an ecosystem. It starts with the capture of energy by primary producers (plants, algae) through photosynthesis.

This energy is then passed on to herbivores that consume the producers, and subsequently to carnivores that eat the herbivores. At each trophic level, energy is transferred but not 100% efficient due to losses in the form of heat and waste products. Therefore, energy flow is unidirectional, with energy ultimately being lost as heat.

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Answer:

General equation = acid +metal---->salt+ hydrogen

word equation =hydrochlooric acid + magnesium ---> magnesium chloride + hydrogen gas.

Explanation:

I hope this is what you want.

Answer:

The magnesium reacts with the acid, producing visible bubbles of hydrogen gas. ... Magnesium ribbon is a flammable solid. Hydrochloric acid is a corrosive liquid. Hydrogen gas is explosive.

Summary: Magnesium, mossy zinc and copper foil are reacted with hydrochloric acid to produce hydrogen gas and a salt. The reaction rates are compared. Hazards: Hydrochloric acid is corrosive and toxic.

HF, HCl, HBr, HI, and HAt are the hydrohalic acids in order of strength from weakest to strongest.

Many hydrohalic acids are hydrohalic acid (chemistry) any acid that results from the binary combination of a halogen and hydrogen. In chemistry, hydrogen halides, which act as Arrhenius acids when in the aqueous phase, are diatomic inorganic compounds. HX is the formula, where X is one of the halogens, such as astatine, fluorine, chlorine, bromine, or iodine. At Standard Temperature and Pressure, all known hydrogen halides are gases.

Hydrogen halides are widely used to describe hydrohalic acids that react with water to form acids. The halogens' formula, HX, allows them to all be used for X. These are organic molecules with two atoms. Among the halogens are iodine, chlorine, bromine, and fluorine. The acid hydrofluoric acid (HF) is not a powerful acid. Since it partially dissociates in water, it is characterized as a weak acid.

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Aphanitic and phaneritic are two different textures found in rocks, which are formed through different cooling processes.


Phaneritic texture: This texture is characterized by large, visible crystals that can be seen without magnification. It occurs when molten rock cools slowly deep within the Earth's crust. The slow cooling allows sufficient time for large crystals to grow. Granite and gabbro are examples of phaneritic rocks.

The key difference between these textures lies in the cooling rate. Aphanitic rocks cool quickly, resulting in small crystals, while phaneritic rocks cool slowly, allowing large crystals to form. The cooling rate is influenced by the depth of formation and the presence of water or other cooling agents.

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Answer:

In a periodic table the average atomic mass of magnesium is given as 24.312 u.

The concept behind the common ion effect is ionization.

When another electrolyte (which includes an ion that is also present in the first electrolyte, i.e., a common ion) is added, the common ion effect suppresses the ionization of the first electrolyte. It is thought to follow from Le Chatlier's principle (or the Equilibrium Law).

An increase in the concentration of one of the ions dissociated in the solution by the addition of another species containing the same ion will result in an increase in the degree of association of ions in a solution where there are several species associating with each other via a chemical equilibrium process.

In the compounds of transition metals, this effect cannot be seen. This occurs as a result of the d-block elements' propensity to produce complex ions. The substance cuprous chloride, which is insoluble in water, is a good example of this. When chloride ions are added, the molecule forms the water-soluble CuCl2 complex ion, which can then be dissolved in water.

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The driving force of dehydration in aldol condensation is the removal of a water molecule from the aldol intermediate.

In aldol condensation, an enolate ion, formed from a carbonyl compound in the presence of a base, attacks the carbonyl group of another molecule to form a beta-hydroxy aldehyde or ketone, known as an aldol. The aldol is then dehydrated through the removal of a water molecule to form an α,β-unsaturated carbonyl compound.

This dehydration step is energetically favorable, as it eliminates a relatively unstable alcohol group and forms a more stable carbon-carbon double bond. The elimination of water also helps to drive the reaction forward by decreasing the concentration of the reactants

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The balanced chemical equation for the given reaction is given as,

2AgNO₃(aq) + NiCl₂(aq) → 2AgCl(s) + Ni(NO₃)₂(aq)

For writing a balanced chemical equation for the reaction between aqueous silver nitrate and aqueous nickel(II) chloride to produce solid silver chloride and aqueous nickel(II) nitrate

First, we have to write the chemical formula for the each of the reactants and products is,

Silver nitrate - AgNO₃

Nickel(II) chloride - NiCl₂

Silver chloride - AgCl

Nickel(II) nitrate - Ni(NO₃)₂

The balanced chemical equation for the reaction is given as,

2AgNO₃(aq) + NiCl₂(aq) → 2AgCl(s) + Ni(NO₃)₂(aq)

Hence, the balanced chemical equation for the reaction is

2AgNO₃(aq) + NiCl₂(aq) → 2AgCl(s) + Ni(NO₃)₂(aq)

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