Strontium-90 has a half-life of 29 years. If a site held 2000 kg of this isotope, approximately what mass of strontium-90 would be left after 116 years?.

13.015  grams of acetylene (C2H2) are required to produce 1.0 moles of CO2.

To find the number of grams of acetylene (C2H2) required to produce 1.0 moles of CO2, we can use the balanced equation for the combustion of acetylene: 2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(g)

From the balanced equation, we know that for every 2 moles of C2H2 that react, 4 moles of CO2 are produced. Therefore, if we want to produce 1.0 moles of CO2, we need to react 1.0 moles of CO2 / 4 moles CO2/ 2 moles C2H2 = 0.5 moles of C2H2.

To convert moles to grams, we use the molar mass of C2H2 which is 26.03 g/mol

So, 0.5 moles of C2H2 = 0.5 x 26.03 g/mol = 13.015 g C2H2

Therefore 13.015  grams of acetylene (C2H2) are required to produce 1.0 moles of CO2

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The process that creates chemical elements lighter than iron is known as nuclear fusion and the evidence is the fusion of carbon and helium nuclei which forms an oxygen nucleus, and so on.

This is referred to as the type of reaction which is characterized by two or more atomic nuclei being combined to form one or more different atomic nuclei and subatomic particles.

It is also responsible for the creation of chemical elements lighter than iron through successive reactions and a common example is the fusion of carbon and helium nuclei to form an oxygen nucleus thereby making it the correct choice.

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Although this sounds fantastic, there is still a lot of debate around the usage of GMOs, and there are good reasons why they shouldn't be used in food, as suggested by Option D, because there isn't enough data on the long-term impacts of consuming GMOs.

The GMO debate centres on genetic material that has been purposefully altered using genetic engineering techniques for improved production, disease resistance, etc. It is unclear at this time whether these modifications are safe for ingestion by humans or the environment. Long-term study should be required for this because some studies have found GMO to be hazardous, such as causing diabetes, while others have found it to be beneficial.

Because there isn't enough data on the long-term effects of consuming GMOs, as Option D says, there is still a lot of controversy around the usage of GMOs and good reasons why they shouldn't be used in food.

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Complete Question -

Genetically-Modified Organisms (GMOs) are currently being developed for agriculture. Currently commercialized GM crops in the U.S. include soy (94%), cotton (90%), canola (90%), sugar beets (95%), corn (88%), and Hawaiian papaya (more than 50%). The use of GMO crops can reduce agricultural costs to farmers and provide greater crop-yields, possibly helping with issues of food shortages. Although this sounds great, there is still a lot of controversy around the use of GMOs. Which of these is a valid argument on why we should not use GMOs in our food?

A) GMOs do not have any nutritional value

B) GMO crops are always more expensive to buy

C) GMO crops are invasive and take over the habitat of local crops

D) there is not enough research on long-term effects of eating GMOs

Answer:

Accuracy refers to how close the arrows are to the bull's eye, while precision refers to how close the arrows are to each other.

In this scenario, the archer's shots are precise but not accurate. The arrows are all within 1 cm of each other, which shows that the archer's shots are consistent and repeatable, but none of the arrows are within 30 cm of the bull's eye. This means that the archer's shots are accurate to a certain extent, but not accurate enough to hit the bull's eye.

To improve the accuracy of the archer, he/she could practice aiming at the bull's eye, and focusing on form and technique. The archer could also get feedback from a coach or mentor to understand what might be causing the arrows to land away from the bull's eye.

On the other hand, the archer's precision is good, and this can be maintained by regular practice and fine-tuning the aim and form. The archer should aim to keep the consistency of the shots and keep the arrows close to each other.

Approximately 0.26 moles of CO2 fill the container.

To determine the number of moles of CO2 that fill the container, we can use the ideal gas law equation:

PV = nRT

Where:

P = pressure of the gas (1.00 atm)

V = volume of the gas (6.28 L)

n = number of moles of gas (unknown)

R = ideal gas constant (0.0821 L·atm/mol·K)

T = temperature of the gas in Kelvin (293 K)

Rearranging the equation, we have:

n = PV / RT

Substituting the given values:

n = (1.00 atm) * (6.28 L) / (0.0821 L·atm/mol·K) * (293 K)

Calculating the expression:

n = 6.28 / 24.0513

n ≈ 0.26 moles

Therefore, approximately 0.26 moles of CO2 fill the container.

It's worth noting that the answer is rounded to two decimal places, as the given values were provided with two decimal places. Additionally, the calculation assumes ideal gas behavior and that there are no other gases or impurities present in the container.

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When radioactive atoms decay, they give off alpha particles, beta particles, and gamma rays in addition to radiation.

Alpha particles are made up of two protons and two neutrons, making them similar to a helium nucleus. They have a positive charge and are relatively large and slow-moving. Beta particles are high-energy electrons or positrons, and are much smaller and faster than alpha particles. They have a negative charge. Gamma rays are high-energy electromagnetic radiation, similar to X-rays. They have no mass and no charge and are the most energetic and penetrating of the three types of particles. These particles are emitted during the radioactive decay process, and the type and amount of particles emitted depends on the specific isotope undergoing decay.

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London Dispersion and Ion-dipoled intermolecular forces contribute to creating a solution of KBr in H₂O.

London Dispersion forces occur between all molecules and result from the fluctuating distribution of electrons in the molecules, leading to a temporary dipole moment. Dipole-dipole forces are attractive interactions between the positively charged end of one molecule and the negatively charged end of another molecule.

The underlying universal forces that cause attractive interactions between nonpolar molecules are Van der Waals or London dispersion forces. London dispersion forces (LDF), dipole-dipole interactions, and hydrogen bonds are the three different intermolecular forces. All substances at least have LDF, but molecules can have any combination of these three types of intermolecular interactions.

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To extract a very non-polar organic substance from a reaction that is run in ethanol, one possible method would be to use a liquid-liquid extraction technique.

This involves separating the non-polar product from the polar ethanol solvent by using a non-polar solvent that is immiscible with ethanol. One common non-polar solvent that can be used for this purpose is hexane. Hexane is immiscible with ethanol and is a good solvent for non-polar compounds. To extract the product, the reaction mixture is first cooled to separate any solid that may have formed. Then, the reaction mixture is added to a separatory funnel and the hexane is slowly added to the top of the funnel.

The two layers will separate and the hexane containing the non-polar product can be drained off the bottom of the funnel. The hexane layer is then washed with a small amount of aqueous solution (such as water or an aqueous solution of an acid or a base) to remove any remaining polar impurities and then dried over anhydrous salt (such as Na2SO4 or MgSO4) to remove any traces of water. After this process, the hexane can be evaporated to obtain the purified non-polar product.

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Add dilute hydrochloric acid to calcium carbonate, bubbles of carbon dioxide gas appear.

These are the steps in this procedure:

a) The component marked J is a heatproof mat that acts as a stable, heat-resistant basis to stop the test tube from shattering as a result of the heat produced.

A test tube is the item with the label K.

This is utilized to keep the reactants in check. The L-shaped component is a delivery tube.

through which the gas produced is piped into the delivery tube.

The M-designated component is a bung.

It serves to keep the generated gas inside the test tube.

Diluted hydrochloric acid, which is the component with the letter N, serves as the reactant that creates the gas.

A delivery tube is the component with the letter P.

It is employed to gather the gas generated.

b) The L-shaped component's job is to route the created gas into the delivery tube.

The P-shaped component's job is to collect the created gas.

c) Downward delivery is the mechanism used to collect the created gas.

This is accomplished by joining the delivery tube to the test tube and submerging the delivery tube's tip in a water beaker.

This enables the generated gas to pass through the delivery tube and into the water-filled beaker.

d) A burning candle or a glowing splinter can be used to detect the gas created.

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From the given data of chemical compounds, 5.32 grams of W and 2.66 grams of X are needed.

The following calculation must be done to determine how much W and X is needed to make the necessary amount of Z because it takes 8 grammes of a chemical compound called Z to make it, and Z is made from compounds W, X, and Y in the ratios of 2: 1: 3 and Y is itself made from W and X, and to make 6 grams of Y requires 4 grams of W and 2 grammes of X.

8/6 = 1.33

The resulting ratio is 2.66 : 2.33  :3:99.

3.99 = w

3.99 x 4/6 = 2.66

1.33 grams of X are equal to 2.66 grams of W.

2.66 x 2 = 5.32

1.33 x 2 = 2.66

5.32 grams of W and 2.66 grams of X are therefore needed.

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Answer:

4.949 g

Explanation:

One mole of any substance has 6.022 x [tex]10^{23}[/tex] atoms or particles.

Setting up ratio between moles and atoms:

Moles    :    Atoms

  1          :     6.022 x [tex]10^{23}[/tex]

  X         :     2.98 x [tex]10^{22}[/tex]

X = (2.98 x [tex]10^{22}[/tex])/(6.022 x [tex]10^{23}[/tex])

X = 0.049 moles

The molar mass of KNO3 is : 39 + 14 + ( 16 x 3 ) = 101 g/mol

Moles   :   Mass

  1          :    101

  0.049  :      X

X = 0.049 x 101

X = 4.949 g

Answer:

I believe the answer is True

Explanation:

I could be wrong but in order for Chlorine 35 and Chlorine 37 to be different would they have to have a different amount of electrons? I am sorry if this is wrong. I took Chemistry a few years ago.

Answer:

The number after the name 'chlorine' is called the mass number. The mass number is a tally of the number of protons and the number of neutrons in an atom's nucleus. Since all atoms of chlorine contain 17 protons, chlorine-35 and chlorine-37 differ in the number of neutrons each one has.

Explanation:

So its true lol

:)

Answer:

Explanation:

the answer is B.

Electrons are subatomic particles that are found in the energy levels swirling around the nucleus on an electron cloud and are negatively charged.

What is meant by nucleus ?

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Answer:

1.2004 x [tex]10^{24}[/tex]

Explanation:

One mole of any substance has 6.022 x [tex]10^{23}[/tex] atoms.

Setting up ratio between moles and atoms:

Moles    :    Atoms

  1          :  6.022 x [tex]10^{23}[/tex]

  2         :    X

X = 2 x ( 6.022 x [tex]10^{23}[/tex] )

X = 1.2004 x [tex]10^{24}[/tex]

216 grams of aluminum oxide will react 25. 0 grams aluminum

What Is Molar mass?

The mass in grams of one mole of a chemical is its molar mass. A mole is the measurement of the number of things, such as atoms, molecules, and ions, that are present in a substance. Any material has 6.022 x 1023 molecules in a mole.

Cookware made of anodized aluminum conducts heat just as effectively as cookware made of regular aluminum, but it has a firm, non-stick surface that makes it scratch-resistant, long-lasting, and simple to clean. Additionally, anodization lessens the amount of aluminum that leaches out of cookware and into foods, especially acidic foods like tomatoes and rhubarb.

4Al+3O2→2Al2O3

The number of moles of aluminium is 25/27 i.e. 0.93moles

4 moles of Al react with 3 moles of O2,

The mole ratio is 4:3.

So, we need (3/4)*0.93 mol= 0.69 mol of O2.

The molar mass of O2 (32 g/mol),

Required amount of oxygen will be 32*0.69g

2 moles of Al2O3 is produced by 4 moles of Al.

The mole ratio is 4:2 i.e. we need (2/4)*0.93 = 0.465 moles of Al2O3

102*0.465 = 216g of Al2O3 is needed.

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A sealable bag holds 3.79 L of gas. To fill the bag, 0.157 moles of H2 gas are required.

The ideal gas equation is what we use to solve this problem. Additionally known as the general gas equation. This equation is used to describe a possible ideal gas. It has a few restrictions. In 1834, Benoit Paul Emile Clapeyron made the first mention of it. An empirical form is used to write the ideal gas law:

                                 PV = n R T

where-

           P = Pressure

           V = volume

          T = Temperature

           n =  The amount of substance

           R =  Ideal gas constant

Now we have the values of these terms as-

            P = 1 atm , V = 3.79L ,  T = 293 K

and     R = 0.0826 L/atm

For getting moles of hydrogen we can use the values of variables in ideal gas equation as -

                    P V = n R T

Now              (1 atm) × ( 3.79L ) = n ×  ( 0.0826 L/atm)  × ( 293K)

                                           n = (1 × 3.79) ÷ (0.0826 x 293)

                                            =  0.157 moles

So that the 0.157moles of H₂ gas are needed for fill the bag .

A hypothetical gas made up of molecules that adhere to a few rules is referred to as the ideal gas. The molecules of ideal gas do not attract or repel one another. An elastic collision with the container's walls or an elastic collision with the ideal gas molecules would be the only interaction between them.

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Determine quantitative density of a liquid whose mass is 62 g and whose volume is 31 mL. A block or wood with the dimensions 3 cm x 2 cm x 5 cm and a heft of 22.5 g (2 g/mL)

How do you calculate a block of wood's volume?

Result for an image A timber block weighs 22.5 grammes and has dimensions of 3 cm x 2 cm x 5 cm. What is that?

It is simple to determine the volume of such a block, prism, a cylinder by multiplying the base's area by the object's height or altitude.

How is block mass determined?

Multiply the volume and density together.

You may get the mass of your object by multiplying your two numbers together. You'll notice that you end up having units of mass if you keep track of both the units as you go along (kilograms or grams). A diamond, for instance, has a volume of 5,000 cm3 and a density of 3.52 g/cm3.

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Determine quantitative density of a liquid whose mass is 62 g and whose volume is 31 mL. A block or wood with the dimensions 3 cm x 2 cm x 5 cm and a heft of 22.5 g (2 g/mL)

Result for an image A timber block weighs 22.5 grammes and has dimensions of 3 cm x 2 cm x 5 cm. What is that?

It is simple to determine the volume of such a block, prism, a cylinder by multiplying the base's area by the object's height or altitude.

Multiply the volume and density together.

You may get the mass of your object by multiplying your two numbers together. You'll notice that you end up having units of mass if you keep track of both the units as you go along (kilograms or grams). A diamond, for instance, has a volume of 5,000 cm3 and a density of 3.52 g/cm3.

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From the given reaction, Oxygen serves as the limiting reagent. Methane remains after the reaction.

A reactant that is completely consumed at the end of a chemical reaction is known as the limiting reagent. Since the reaction cannot proceed without this reagent, the amount of product that can be produced is constrained.

Because its quantity restricts the number of products that can be generated, the reagent that is totally consumed or reacted is known as the limiting reagent.

CO₂ + 2H₂O ⇒ CH₄+ 2O₂

One mole of methane will totally react with two moles of oxygen to produce one mole of CO₂ and two moles of water, according to the stoichiometric equation given above.

64g of oxygen and 16g of methane will totally react in such case.

When methane is burned, the weight ratio of the reactions between CH₄ and O₂ is (16:64)=1:4.

Only 32 g of oxygen are provided in the question, though. Since we only have 32 when 64 is divided, oxygen will be the limiting reagent in this scenario.

Oxygen serves as the limiting reagent.

Methane is the extra reagent.

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2C2H2 (g) +502 (g) > 4C02 (g) + 2H20 (g), 90.8 L liters of C2H2 react with 66.0 L of oxygen, assuming the reaction is at STP.

What is oxygen?

Because oxygen contains only one type of atom, it is a chemical element, which is a type of substance. Since oxygen has an atomic number of 8, it is represented by the letter O in its formal chemical formula and has eight protons in its nucleus. In nature, molecular oxygen can be discovered.

What is reaction?

During a chemical reaction, one or more chemicals, sometimes referred to as reactants, are transformed into one or more new compounds, sometimes referred to as products. Both chemical components and elements are substances.

2C2H2 (g) +502 (g) > 4C02 (g) + 2H20 (g)

At STP, the molar volume is 22.7L

First, we must convert 52grams of acetylene into moles. Acetylene has a molar mass of  26.04g/mol. So here, there exist approximately

52g/ 26.04g/mol≈2 mol

.Now, we see that the mole ratio between

C2H2 is 2:4. So, 2 moles of acetylene will fully produce 4 moles of CO2

Since we also have 2 moles of acetylene, we produce 4moles of CO2. Remember at STP, the molar volume is 22.7L , and so the volume of carbon dioxide produce would be

4 mol. 22.7L/ 1 mol = 90.8 L

Therefore,2C2H2 (g) +502 (g) > 4C02 (g) + 2H20 (g), 90.8 L liters of C2H2 react with 66.0 L of oxygen, assuming the reaction is at STP.

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The empirical formula, P₂O₅, is the simplest whole number ratio to define the atoms that make up a species.

We calculate the ratio of phosphorus and oxygen atoms using the assumption that there are 100 g of unknown. There are 56.36 g of oxygen and 43.64 g of phosphorus in 100 g of material.

We divide via by each component's atomic mass:

O : 56.36 g / 16 g/mol = 3.52 mol oxygen
P : 43.64 g / 31 g/mol = 1.41 mol phosphorus

We want to get whole numbers, thus we divide through by the smallest molar quantity:

3.52. mol 1.41 mol of oxygen Equals 2.5

1 phosphorus is 1.41 mol of phosphorus.

A PO2.5 formula does us absolutely no benefit. The empirical formula is the simplest whole number ratio defining constituent atoms in a species, as we have shown, which is why. So, we only increase the ration by two to  give P₂O₅ as required.

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The molecular formula and name of the acid would be [tex]C_4H_8O_2[/tex] and butanoic acid respectively.

The number of moles of the alkanoic acid is 0.5 mol and the mass of the acid is 44g. We can use this information to determine the molar mass of the acid as follows:

Molar mass = mass/mole = 44/0.5 = 88 g/mol

The alkanoic acid with a molar mass of 88 g/mol is butanoic acid.

[tex]C_4H_8O_2[/tex] = (12x4) + (1x8) + (16x2) = 88 g/mol

In other words, the name of the mono alkanoic acid is butanoic acid and the molecular formula is  [tex]C_4H_8O_2[/tex].

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If 0.5 mol of mono-alkanoic acid weighs 44 g determine the molecular formula and the name of the acid​

A buffer solution of diclofenac (pKa= 4.15) is buffered at ph 5.5.

The Henderson-Hasselbalch equation is commonly used to calculate the pH of buffer solutions. Buffers are made up of a weak acid and a conjugate base. As a result, for a generic weak acid, we could call it HA, and its conjugate base would be A-. To calculate the pH of the buffer solution, find the pKa of the weak acid and multiply it by the log of the conjugate base concentration divided by the concentration of the weak acid.

First, we need to know the pKa of the weak acid, which is acetic acid.The Ka value is less than one because acetic acid is a weak acid. To find the pKa of acetic acid, we take the negative log of the Ka value. So the negative log of 1.8 times 10 to the negative fifth is equal to 4.74. So we can go back to the Henderson-Hasselbalch equation and write that the pH is equal to the pKa, which we just calculated to be 4.74 plus the log of the concentration of the conjugate base.

And therefore, the pH of the buffer solution is less than the pKa of the weak acid. And in the third example, the concentration of the weak acid was less than the concentration of the conjugate base.

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Answer: 30.3987 m/s

you might need to round that to the nearest hundredth or tenth

Explanation:

To solve this we must be knowing each and every concept related to speed  and its calculations. Therefore, 68 mi/hr  in m/s is 28.9m/s.

Speed may be defined as the distance traveled by an item in relation to the time that takes to travel that distance. In other words, it measures how rapidly an item travels but does not provide direction. The term "velocity" refers to the combination of direction and speed.

The average speed is the total distance traveled by the item in a particular time frame. A scalar quantity is average speed. The magnitude of a scalar quantity indicates that it has no direction.

Speed=Distance/Time

68 mi/hr  in m/s?

68 mi/3600=0.018m mi/s×1609

                   =28.9m/s

Therefore, 68 mi/hr  in m/s is 28.9m/s.

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A neutron is a subatomic particle found in the nucleus of every atom except that of simple hydrogen. The particle derives its name from the fact that it has no electrical charge; it is neutral. Neutrons are extremely dense.

What is meant by neutron ?

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Low pressures and high temperatures are the optimal conditions for gas behaviour. The ideal gas law [tex]PV = nRT[/tex] states that ideal gases must conform to this law.

It is only feasible if the gas is made up of several freely moving point particles that do not interact with each other and have a very small total volume. An ideal gas is one in which all collisions between atoms or molecules are completely elastic and in which there are no intermolecular attraction forces. It can be compared to a collection of perfectly hard spheres that collide but do not interact with one another in any other way. The molecules of perfect gases are not attracted to one another or repel one another.

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Option A has the correct order of compounds that are arranged in order of increasing strength of intermolecular forces.

Intermolecular forces are those forces which binds the molecules together in any matter whether it be solid, liquid or gas. The strength of these forces may differ from one matter to other and are also weaker in nature as compared to the covalent bonding.

These forces determine bulk properties, such as melting points of solids and boiling points of liquids. Intermolecular forces are electrostatic in nature and arise from the interaction between positively and negatively charged species.

Here are some types of intermolecular forces that exists in nature:

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Using the expression of Clausius-Clapeyron equation we can calculate the vapor pressure. Putting all the values in the expression we get the result.

The vapor pressure can be defined as the force that an evaporating substance exerts against the walls of a sealed container. ln (P1/P2) = (ΔHvap. /R) (1/T2 - 1/T1). where, P1 and  P2 are the vapor pressures at two temperatures T and T2 . A solution made from 23.5 g of glycerin in 130 g of methanol at 50 °C. The vapor pressure of pure methanol at 50 °C is 400 torr. Clausius-Clapeyron equation allows to estimate the vapor pressure at another temperature if the vapor pressure is known at some temperature and if the enthalpy of vaporization is known. The partial vapor pressure of a component in a mixture is equal to the vapor pressure of the component at that temperature multiplied by the component's mole fraction.

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The band of light rock is younger.

What rock has bands of light and dark minerals?

Granite is a type of rock that has bands of light and dark minerals. It is composed of two main minerals, quartz and feldspar, and can contain smaller amounts of othGranite is a common type of intrusive, felsic, igneous rock that is granular and phaneritic in texture. Granite is a common type of intrusive, felsic, igneous rock that is granular and phaneritic in texture. It is a very hard, durable rock that is resistant to erosion and weathering, making it a popular choice for construction and building materials. Granite is also popular for use in countertops, flooring, and other decorative applications.

The band of light rock is usually younger than the rock that surrounds it. This is because light rock is typically formed through a process of erosion, which requires time for the rock to wear away. On the other hand, the rock that surrounds the light rock is typically much older, often having been formed millions of years ago.

Hence, the band of light rock is usually younger.

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