A 100g sample of Carbon-14 has a half-life of 5 years. How much Carbon-14 is left after 10 years?

Answer:

answer is point no 9.o6×10-5

Answer:

A

Explanation:

Did it on edge 2020

Answer:

82

Explanation:

Atomic number of the isotope is 26 and it has a mass number of 56

X = ⁵⁶₂₆Fe

The three main subatomic particles in an atom are

1. Proton

2. Neutron

3. Electron

The number of protons and electrons are usually equal so as to maintain electrical neutrality in the atom except in cases where it's a charged particles hence the number of proton and electrons will differ.

In this case, the atomic number is 26 and atomic numbers are also known as the number of protons (positively charged particle).

Proton = 26

Electrons = 26 (since it's a naturally charged particle)

Neutron = ?

Mass number = sum of proton and neutrons. This variation in the mass number usually leads to isotopes of an atom and this is mainly caused by variation in the number of neutrons eg. Carbon-12 and Carbon-13 have different number of neutrons.

Mass number = protons + neutrons

Neutrons = mass number - protons

Neutrons = 56 - 26

Neutrons = 30

Subatomic particles present are

Protons = 26

Electrons = 26

Neutrons = 30

Total number = (26 + 26 + 30) = 82

The total number of subatomic particles is 82.

The total number of subatomic particles in the nucleus of this common isotope of iron (with an atomic number of 26 and a mass number of 56) is the sum of protons and neutrons, which is 56.

An isotope is a variant of an element that has the same number of protons (which is the atomic number) but differs in the number of neutrons. The atomic number of iron (Fe) is 26, which reflects the number of protons in the nucleus. The mass number (56) is the combined total of protons and neutrons in the nucleus. Since we know there are 26 protons (from the atomic number), the remainder must be neutrons. So, 56 (mass number) minus 26 (atomic number) gives us 30 neutrons.

Therefore, the total number of subatomic particles in the nucleus of this isotope of iron is 26 (protons) + 30 (neutrons) = 56 particles in total.

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Answer:

It is not a gas because its particles do not have large spaces between them.

Explanation:

Answer:

B) When the urea dissolves it absorbs heat and the cold pack gets colder.

Explanation:

Cold packs usually contains two bags, one contains a water and the other inside is a form of ammonium nitrate  as the solid (s) or urea.

Breaking the inner portion activates the instant cold pack thereby releasing the solid urea into the surrounding water makes the urea to react with the water and makes it cold. This is because the reaction that takes place then undergoes an endothermic reaction, Hence heat is absorbed from the surroundings and the cold pack gets colder

The cold pack gets colder as a result of an endothermic reaction where urea dissolves in water and absorbs heat from the surroundings.

When Holly activates her instant ice pack by breaking the inner compartment, she initiates an endothermic reaction in which the solid urea dissolves in water. During this endothermic dissolution, the urea absorbs heat energy from the surrounding environment, which includes Holly's injured shoulder. This absorption of heat causes the temperature of the pack and the surrounding area to decrease, thus the pack feels cold to the touch. Therefore, the process that Holly observes as she uses the cold pack is B) When the urea dissolves it absorbs heat and the cold pack gets colder.

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Answer:

Honey is   ------ A mixture and a solution

Grape Juice is ------ A mixture and a solution

Sand on the beach is ----- A mixture but not a solution

A mixture of Carbon Dioxide and nitrogen gases is ----- A mixture and a solution

Rubbing Alcohol is ----- A mixture and a solution

Explanation:

Please put 5.0 stars so other ppl know its corrrect :D

They're correct^^^

The next question:

Question:

Select the term that completes each statement.

When acetic acid is dissolved in water to make vinegar, acetic acid is the

When a small amount of carbon is dissolved in iron to make steel, the iron is the

When a small amount of hydrogen gas mixes with nitrogen gas, hydrogen is the

When carbon dioxide gas dissolves in water, water is the

When a small amount of solid iodine is mixed with ethanol, ethanol is the

Answer:

solute

solvent

solute

solvent

solvent

Explanation:

edge :) have a lovely day!

and thank you for the answers to the first one lovely person above me <3

The elements on the periodic table that form cations in ionic compounds are primarily found in the alkali metals (group 1), alkaline earth metals (group 2), transition metals  and the representative metals. These elements lose electrons to achieve a stable electron configuration and form cations with positive charges.

The areas of the periodic table that contain elements which form cations in ionic compounds are primarily the groups that contain metals. These are the alkali metals (group 1), alkaline earth metals (group 2) and transition metals (groups 3-12). These elements lose electrons and form cations with positive charges. For example, an atom of an alkali metal like sodium (Na) loses one electron and forms a cation with a 1+ charge.

Transition elements and post-transition metals can also form cations in ionic compounds. Although their charges can vary, they often lose electrons to achieve a stable electron configuration.

These are termed as representative metals, including aluminum, zinc, and tin, which can exhibit different positive charge magnitudes based on their group and period. For instance, aluminum (Al) from group 13, and zinc (Zn) from group 12, commonly lose 3 and 2 electrons respectively to form cations.

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Answer:

Q = 63.75J

Explanation:

Mass = 2.5g

Initial temperature (T1) = 25°C

Final temperature (T2) = 50°C

Specific heat capacity of Mg = 1.020J/g°C

Heat energy = ?

Heat Energy (Q) = mc∇T

Q = heat energy

M = mass of substance

C = specific heat capacity of substance

∇T = change in temperature = T2 - T1

Q = mc∇T

Q = mc(T2 - T1)

Q = 2.5 × 1.020 × (50 - 25)

Q = 2.55 × 25

Q = 63.75J

The heat energy required to raise magnesium metal from 25°C to 50°C is 63.75J

Answer:

The two isotopes have the same number of protons within the nucleus.

Explanation:

Answer:

Protons

Explanation:

Odyssey ware

Answer:

0.0679

Explanation:

Answer:

12.64 cm^3 to the nearest hundredth

Explanation:

1 L of 0.25M of HCl contains 0.25 * (1.008 * 35.45) g of HCl

= 9.1145 g HCl.

So 2 litres contain 18.229 g HCl.

So we need the volume of concentrated acid which contains 18.229 g HCl.

1.46 * 0.98 = 1.4308 g are in  1 cm^3

So 18.229 g are in  18.229/1.4308

= 12.6404 cm^3 (answer).

Common errors in atomic models can include incorrect placement of subatomic particles, improper scale, misunderstanding of atomic space, or misrepresentation of electron paths as demonstrated in the Bohr model.

Without seeing the specific diagram referenced in the question, it's hard to identify the exact flaw in the model of the atom. However, common mistakes in atomic models often include misplacing the subatomic particles (protons, neutrons, and electrons), misunderstanding the scale of the atom, or ignoring the fact that atoms are mostly empty space. For example, in the Bohr model of the atom, electrons orbit the nucleus in definite paths, which is an inaccurate depiction according to quantum mechanics.

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Answer:

it is B 168 It is 100% sure

Explanation:

Answer: The [tex][OH-][/tex] concentration of the aluminum hydroxide solution is [tex]1.41\times 10^{-10}[/tex]

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pOH is calculated by taking negative logarithm of hydroxide ion concentration.

[tex]pOH=-\log [OH^-][/tex]

Putting in the values:

[tex]9.85=-\log[OH^-][/tex]

[tex][OH^-]=10^{-9.85}=1.41\times 10^{-10}[/tex]

Thus the [tex][OH-][/tex] concentration of the aluminum hydroxide solution is [tex]1.41\times 10^{-10}[/tex]

Answer: [tex][OH^{-}][/tex] of the aluminium hydroxide solution is [tex]1.41 \times 10^{-6}[/tex].

Explanation:

It is given that pH is 9.85 and the relation between pH and concentration of ions is as follows.

                 pH = [tex]-log [H^{+}][/tex]

                9.85 = [tex]-log [H^{+}][/tex]

          antilog (9.85) = [tex][H^{+}][/tex]

           [tex][H^{+}] = 7.1 \times10^{-9}[/tex]

We also know that,

               [tex][H^{+}][OH^{-}] = 10^{-14}[/tex]

        [tex][OH^{-}] = \frac{10^{-14}}{7.1 \times 10^{-9}}[/tex]

                      = [tex]1.41 \times 10^{-6}[/tex]

Therefore, we can conclude that [tex][OH^{-}][/tex] of the aluminium hydroxide solution is [tex]1.41 \times 10^{-6}[/tex].

Answer: d

Explanation: i got it right on acellus

Answer:

the first is 5

the second is  3

The third is 5

the last one is  4:)

Explanation:

Answer:

a

Explanation:

Answer:

200 m/s.

Explanation:

The car's velocity after 3 seconds can be calculated using the kinematic equation:

v= u+ at

Given:

- Initial velocity, u = 50m/s

- Acceleration, a = 50m/s2

- Time, t = 3 s

Plugging the values into the equation:

v = 50 + 50 * 3

v = 50 + 150

v = 200 m/s

Therefore, the car's velocity after 3 seconds will be 200 m/s. Hope this helps!!

The car's velocity after 3 seconds is 200 m/s, calculated using the formula for final velocity with an initial velocity of 50 m/s and an acceleration of 50 m/s².

To find the final velocity of a car with an initial velocity and constant acceleration, you can use the formula v = u + at, where v is final velocity, u is initial velocity, a is acceleration, and t is time.

In this case, the car has an initial velocity (u) of 50 m/s and a constant acceleration (a) of 50 m/s². After 3 seconds (t), we can calculate the final velocity using the formula:

v = u + at
v = 50 m/s + (50 m/s² × 3 s)
v = 50 m/s + 150 m/s
v = 200 m/s

Therefore, the car's velocity after 3 seconds is 200 m/s.

Answer:

B. covers all body surfaces

Explanation:

epi=upper (outside of skin)

- Hope that helps! Please let me know if you need further explanation.

Answer:

The hydrogen ion concentration of the substance is 3.16*10⁻⁵ M

Explanation:

pH is a parameter used to measure the degree of acidity or alkalinity of a substance. The pH is calculated as the negative logarithm (base 10) of the concentration of hydronium ions [H₃O⁺] or hydrogen ions [H⁺].

pH= - log [H₃O⁺]= - log [H⁺]

Values ​​on the pH scale range from 0 to 14, where pH equal to 7 is neutral, below 7 is acidic and above 7 is basic.

In this case, pH= 4.5

So:

4.5= - log [H⁺]

Solving:

[ H⁺]= 10⁻⁴ ⁵

[H⁺]= 3.16*10⁻⁵ M

The hydrogen ion concentration of the substance is 3.16*10⁻⁵ M

Answer:

19.2g

Explanation:

The equation of the reaction is;

Li3N(s) +3H2O(l) ---->NH3(g) +3LiOH(aq)

From Avogadro's law we know that 1 mole of any gas occupies a volume of 22.4 L under standard conditions.

It is also clear from the equation that 1 mole of lithium nitride produces 1 mole of ammonia occupying 22.4L volume

Hence;

1 mole of Lithium nitride yields 22.4 L of ammonia

x moles of lithium nitride yields 12.26L of ammonia

x= 12.26×1/22.4

x= 0.55 moles of lithium nitride

Molar mass of lithium nitride= 34.83 g/mol

Mass of lithium nitride = number of moles × molar mass

Mass of lithium nitride= 0.55 moles × 34.83 g/mol

Mass of lithium nitride = 19.2g

Answer:

The mass of lithium nitride that produces 12.26 L of ammonia is 19.053 g

The mass of lithium hydroxide produced is 39.3 g

Explanation:

Water and Lithium nitride combine to form ammonia and lithium hydroxide the  equation for the reaction being;

Li₃N(s) + 3H₂O(l) → NH₃ (g)  + 3LiOH (aq)

That is 1 mole of lithium nitride combines with 3 moles of water molecules to form 1 mole of ammonia gas plus 3 moles of lithium hydroxide

Whereby the volume of ammonia produced is 12.26 L, we have at STP

PV = nRT

Therefore, n = PV/RT

Where:

P = Pressure = 1 atm

V = Volume = 12.26 L

R = Universal gas constant = 0.08205 L·atm/(mol·K)

T = Temperature = 273.15 K

Plugging the values in gives;

n = (1×12.26)/(0.08205×273.15) = 0.547 moles

Since 1 mole of lithium nitride forms 1 mole of NH₃, 0.547 mole will be required to produce 0.547 moles of NH₃ and 3×0.547 or 1.64 moles of LiOH

Molar mass of Li₃N = 34.83 g/mol

Molar mass of LiOH = 23.95 g/mol

Since mass = Number of moles × molar mass, we have;

Mass of Li₃N = 0.547 × 34.83 = 19.053 g  

Mass of LiOH = 1.64 × 23.95 = 39.3 g

Therefore;

The mass of lithium nitride that produces 12.26 L of ammonia = 19.053 g

The mass of lithium hydroxide produced = 39.3 g.

88.98 %

The Balance Chemical Equation is as follow,

                                  2 HCl + Pb(NO₃)₂     →    2 HNO₃ + PbCl₂

According to equation,

          331.2 g (1 mole) Pb(NO₃)₂ produces  =  278.1 g (1 mole) PbCl₂

So,

                 870 g of Pb(NO₃)₂ will produce  =  X g of PbCl₂

Solving for X,

                     X  =  (870 g × 278.1 g) ÷ 331.2 g

                     X  =  730.5 g of PbCl₂

Therefore,

               Theoretical Yield =  730.5 g

Also as given,

                Actual Yield =  650 g

So using following formula for percentage yield,

                        %age Yield  =  (Actual Yield / Theoretical Yield) × 100

Putting values,

                        %age Yield  =  (650 g / 730.5 g) × 100

                        %age Yield  =  88.98 %

Brianliest please and thank you.

Final answer:

To find the percent yield of lead(II) chloride, calculate the theoretical yield based on the balanced chemical equation and the given amount of lead(II) nitrate. Then, divide the actual yield by the theoretical yield and multiply by 100% to find the percent yield.

Explanation:

To find the percent yield of lead(II) chloride, we need to compare the actual yield to the theoretical yield. The theoretical yield is the amount of lead(II) chloride that would be formed if the reaction went to completion. The actual yield is the amount of lead(II) chloride that was actually obtained in the experiment. To calculate the theoretical yield, we can use the stoichiometry of the balanced chemical equation.

From the equation, we can see that 1 mole of lead(II) nitrate reacts with 2 moles of hydrochloric acid to produce 1 mole of lead(II) chloride. Therefore, the amount of lead(II) chloride that would be formed from 870 grams of lead(II) nitrate can be calculated as follows:

Calculate the number of moles of lead(II) nitrate:

Use the mole ratio from the balanced equation to calculate the number of moles of lead(II) chloride that would be formed:

Convert moles of lead(II) chloride to grams:

The actual yield of lead(II) chloride is given as 650 grams. To calculate the percent yield, we use the formula:

Percent Yield = (Actual Yield / Theoretical Yield) x 100%

Substituting in the values we found:

Percent Yield = (650 / 748) x 100% = 86.77%

Answer:

he can by checking up each person particle and make beyond any doubt the atom numbers are the same within the reactants and the products

Explanation:

i hope this helps

counting up each individual atom and make sure the atom numbers are the same in the reactants and the products

Explanation:

just found it on quizzlet

Answer:

V = 7.8 L

Explanation:

Message

The volume of gas of 0.323 mole sample of a gas at 265 K and 0.900 atm is 7.798L.

Ideal gas equation gives idea about the behavior of gas at different condition & represented as:

PV = nRT, where

On putting all these values on the above equation, we get

V = (0.323)(0.082)(265) / (0.9) = 7.798 L

Hence required volume of gas is 7.79L.

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Answer:

Air, liquids or solids.

Explanation:

Sound is a form of mechanical waves, which needs a material medium to propagate. There is no sound in the void. Sound can be propagated in gases, liquids and solids. The best choice is "Air, liquids or solids".

J.J. Thomson's experiments with cathode ray tubes showed that electrons are many thousand times smaller than the nucleus and negatively charged.

J.J. Thomson's experiments with cathode ray tubes implied that electrons are many thousand times smaller than the nucleus and negatively charged. Thomson discovered that cathode rays, which were later identified as streams of electrons, were deflected by electric and magnetic fields in a way that indicated they had a negative charge. Furthermore, based on the amount of deflection, Thomson was able to deduce that electrons had far less mass than atoms, leading to the conclusion that electrons are much smaller than the nucleus.

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J.J. Thomson's experiments with cathode ray tubes showed that option C) electrons are many thousand times smaller than the nucleus and negatively charged.

J.J. Thomson's experiments with cathode ray tubes implied that electrons are many thousand times smaller than the nucleus and negatively charged. He noticed that the rays in the tube were deflected towards the positive plate, indicating that they possessed a negative charge. By measuring the deflection and applying known magnetic and electric fields, Thomson was able to determine the mass-to-charge ratio of the electron and estimate its mass.

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