Write nuclear symbols for each of the isotopes Carbon-14 Cobalt-60 Gold-197 Uranium-235

Answer:

C₂ = 50 mg/L

C₃ = 42.5 mg/L

Explanation:

To do this, we just need to use the following expression:

C₁V₁ = C₂V₂     (1)

Where:

C₁: Original concentration of the Iron solution (mg/L)

V₁: aliquot of the iron solution (mL or L)

C₂: Concentration of the iron after beind dilluted (mg/L)

V₂: Volume of the flask that's being used.

Using the above expression, we just solve for C₂:

C₂ = C₁V₁ / V₂   (2)

We have the required volumes, but we do not have the concentration of the iron solution (C₁). To determine this, we use the initial flask of 100 mL and the mass of the iron:

C₁ = 25 mg / 0.1 L = 250 mg/L

With this value, we can replace in (2) to get the concentration on each flask.

Flask 1:

We have an aliquot of 20 mL, and it was dilluted to 100 mL, the concentration would be:

C₂ = 250 mg/L * (20/100)

Flask 2:

We have an aliquot of 17 mL dilluted to 100 mL so:

C₃ = 250 * (17/100)

Hope this helps

The concentration of iron in mg/L in each of the two flasks is 50 mg/l and 42.5 mg/L respectively.

The initial concentration of iron in the sample is obtained as follows:

A vitamin tablet containing 25 mg of iron is dissolved in 6M HCl and then made up to 100 mL in a 100 mL volumetric flask with DI water.

Concentration of iron in the solution = 25 mg/ 100 mL

Converting to mg/L; 1 L = 1000 mL, then 100 mL = 1000 * 1 L/ 1000 mL = 0.1 L

Concentration of iron in the solution in mg/L = 25 mg / 0.1 L = 250 mg/L

Then 20 mL and 17 mL of this solution were pipetted into separate 100 mL volumetric flasks and each of these was brought up to 100 mL volume by diluting with DI water to the mark.

Using the dilution formula C₁V₁ = C₂V₂ to determine the concentration of iron in each of these flasks:

C₁ = initial concentration; V₁ = initial volume

C₂ = final concentration; V₂ = final volume

Flask 1:

C₁ = 250 mg/L, V₁ = 20 mL, C₂ = ?, V₂ = 100 mL

C₂ = C₁V₁ / V₂

C₂ = 250 * 20 / 100

C₂ = 50 mg/L

Flask 2:

C₁ = 250 mg/L, V₁ = 17 mL, C₂ = ?, V₂ = 100 mL

C₂ = C₁V₁ / V₂

C₂ = 250 * 17 / 100

C₂ = 42.5 mg/L

Therefore, the concentration of iron in mg/L in each of the two flasks is 50 mg/l and 42.5 mg/L respectively.

Learn more: https://brainly.com/question/6103588

To solve such this we must know the concept of combination reaction. Therefore, the given reaction CH\(_4\)+Br\(_2\) \(\rightarrow\)CH\(_3\)Br+ HBr is a combination reaction.

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

CH\(_4\)+Br\(_2\) \(\rightarrow\)CH\(_3\)Br+ HBr

The above reaction is a combination reaction. In combination reaction, more than one reactant combine to form a product. Because new chemicals are created during combination reactions, they are often referred to as synthesis.

Therefore, the given reaction is a combination reaction.

Learn more about the chemical reactions, here:

https://brainly.com/question/3461108

#SPJ1

Answer:

Explanation:

Because air puffs up the cream as it is whipped, there is a physical change even though the ingredients are still cream and air.

Physical modifications are those that affect a chemical substance's form but not its chemical content. Physical changes may normally be used to separate compounds into chemical elements or simpler compounds, but they cannot be used to separate mixtures into their component compounds.

Liquid cream is extensively combined with small air bubbles to form the foam colloid known as whipped cream. Because milk is transformed from a colloid (cream) to a solid (butter) without changing its chemical makeup, turning milk into butter is a physical transformation. This change in the body can be undone.

Thus, there is a physical change even though the ingredients are still cream and air.

To learn more about the physical change, follow the link;

https://brainly.com/question/3680148

#SPJ1

HAZWOPER training and certification recognize:

The correct option is both A and C

HAZWOPER (Hazardous Waste Operations and Emergency Response) training and certification recognize that a large number of victims (as much as 80%) in hazardous waste incidents or emergencies will self-present or be self-referred for medical treatment.

Additionally, HAZWOPER training acknowledges that victims may use any entrance they can access at a hospital, not just the emergency department entrance.

This is because individuals affected by hazardous materials may arrive at different areas of the hospital seeking medical assistance.

Therefore, option d. Both A and C are correct statements regarding the recognition of HAZWOPER training and certification.

Learn more about HAZWOPER at: https://brainly.com/question/31561828

#SPJ1

Answer:

The molar mass of atoms of an element is given by the standard relative atomic mass of the element multiplied by the molar mass constant

Explanation:

Based on the reactivities of the elements involved, the reaction which will form products that are more stable than the reactants is CaBr₂ + 2Na → 2NaBr + Ca and is therefore denoted as option B.

This is referred to as the measure of how readily a substance or element undergoes a chemical reaction.

According to the reactivity series, the metal which lies above in the reactivity series will easily displace the metal which lies below in the reactivity series. In this scenario sodium is more reactive than calcium as it lies above in the reactivity series therefore sodium will easily displace calcium in the given chemical reaction.

Read more about Reactivity here https://brainly.com/question/11358347

#SPJ1

Answer:

4.53gm

Explanation: n=m/M

n is # of moles

m is mass

M is molar mass

so m=n*M when you rearrange the equation

Answer:

conservation of mass

Each person should choose 6 items from Column A and 4 items from Column B, ensuring that everyone orders the same number of items from each column. Option B

To divide the items evenly among four people while ensuring that each person orders the same number of items from each column, we need to find the common divisor of the number of items in each column.

Column A has 24 items, and Column B has 16 items. The common divisor of 24 and 16 is 8. Therefore, each person should choose 8 items.

Since there are 24 items in Column A, and each person needs to choose 8 items, the answer is 24 divided by 8, which equals 3. Each person should choose 3 items from Column A.

Similarly, since there are 16 items in Column B, and each person needs to choose 8 items, the answer is 16 divided by 8, which equals 2. Each person should choose 2 items from Column B.

Therefore, the correct answer is:

B) 6 from A, 4 from B

Each person should choose 6 items from Column A and 4 items from Column B, ensuring that everyone orders the same number of items from each column.

For more such questions on Column  visit:

https://brainly.com/question/17532859

#SPJ8

The amount of heat energy absorbed when 200 grams of water are heated from 20 C to 60 C is 33,440 Joules.

To find the amount of heat energy absorbed when 200 grams of water are heated from 20 C to 60 C, we can use the equation Q = mcAT.
First, we need to find the value of m, which is the mass of the water in grams. In this case, it is given as 200 grams.
Next, we need to find the value of AT, which is the change in temperature in degrees Celsius.

This can be calculated by subtracting the initial temperature from the final temperature, which gives us 60 C - 20 C = 40 C.
The specific heat capacity of water, C, is given as 4.18 Joules per gram per degree Celsius.
Now we can plug in the values into the equation:
Q = mcAT
Q = (200 g) x (4.18 J/g°C) x (40°C)
Q = 33,440 J
Therefore, the amount of heat energy absorbed when 200 grams of water are heated from 20 C to 60 C is 33,440 Joules.

for more such question on heat energy

https://brainly.com/question/25603269

#SPJ8

I always was bad at science

HBr has a dipole moment of 7.95debye and an interatomic spacing of 1.94 x 10-om.

HBr (a polar covalent molecule) has a dipole moment () of 0.851D (debye) and a percentage ionic character of 12.6%.

The size of the charge multiplied by the distance between the centres of the positive and negative charges yields a dipole moment. The Greek character " is used to represent it. It is measured in Debye units ('D'). 1 D = 3.33564 10-30 C.m, where C signifies Coulomb and m a metre.

It's 1018 statcoulomb-centimeters. Traditionally, the debye moment was defined as the dipole moment produced by two charges of opposing sign but equal magnitude of 1010 statcoulomb.

learn more about dipole moment

https://brainly.com/question/11626115

#SPJ1

Answer:

The number of moles of HCl in the 250 mL volumetric flask is 0.003 moles

Explanation:

Firstly, we solve for the concentration of acid using the formula

CaVa/CbVb = nₐ/nb

where Ca is the concentration of acid

Cb is the concentration of base

Va is the volume of acid

Vb is the volume of base

nₐ is the number of moles of acid (from the equation)

nb is the number of moles of base (from the equation)

Ca × 250/0.09876 × 29.59 = 1/1

Ca = 0.09876 × 29.59/250

Ca = 0.012 M

To determine the number of moles of HCl acid present in the 250 ml volumetric flask, the formula for molarity is used

Molarity = number of moles ÷ volume (in liter or dm³)

Volume needs to be converted to liter; 250 ml ⇒ 0.25 L

Molarity of the acid is 0.012 M

From the formula above, number of moles = molarity × volume (in liter)

number of moles = 0.012 × 0.25

number of moles of acid = 0.003 moles

Answer:

the rate at which reactants form products is the same as the rate at which products form reactants

Explanation:

There is still  a reaction happening just that the second one happens the opposite happens and keeps it at net 0

Answer:

Once a density has been calculated the tool will also display two conversion scales for a range of mass and volume values

Explanation:

The density of this particular liquid is \(5833 kg/ m^3\).

Density is defined as mass per unit volume. It is a standard mechanical quantity. The most frequently used symbol for density is ρ (rho), D can also be used which is a Latin letter.

It can be expressed as

\(\rho ={\frac {m}{V}}\\\\\rho = density \\m = mass\\V = volume\)

Density is expressed in \(kg/m^3\) , mass in kg and volume in \(m^3\)

For above given information,

Mass= 350 g= 0.350kg

Volume= 60ml = 0.00006 \(m^3\) (\(1ml= 1/10^6 m^3\))

So, Density= 0.350/0.00006 = \(5833 kg/m^3\)

Thus, the density of this particular liquid is \(5833 kg/ m^3\).

Learn more about Density, here:

https://brainly.com/question/952755

#SPJ2

As per the temperature, the molecules of a substance act differently. The melting point is -114.2 °C and The boiling point of hydrogen chloride (HCl) is -85.05 °C. The correct sketch in each set is as follows:

Thus, if the temperature is kept above  -85.05 °C, the molecules will be placed widely apart and will be in the gaseous state, revealing their properties.

If the temperature is between -114.2 °C and -85.05 °C, the molecules will be organized in layers capable of slipping over one another since they will be in a liquid state.

At last, the molecules will be arranged in an orderly manner because they will be in a solid state if the temperature is below -114.2 °C.

To learn more about hydrogen chloride,

brainly.com/question/17429912

#SPJ4

Answer:

On the landscape, freshwater is stored in rivers, lakes, reservoirs, and creeks and streams. Most of the water people use everyday comes from these sources of water on the land surface.

Answer:

On the landscape, freshwater is stored in rivers, lakes, reservoirs, and creeks and streams. Most of the water people use everyday comes from these sources of water on the land surface.

Answer:

\(MM_{C_5S_2}=132.19g/mol\)

Explanation:

Hello!

In this case, since the computation of the molar mass requires the molecular formula, we first realize that of pentacarbon disulfide is C₅S₂ due to the given prefixes. In such a way, we multiply the atomic mass of carbon by five and that of sulfur by two as shown below:

\(MM_{C_5S_2}=5m_C+2m_S\)

Thus, we plug in the atomic masses given in the periodic table to obtain:

\(MM_{C_5S_2}=5*12.01+2*32.07\\\\MM_{C_5S_2}=132.19g/mol\)

Best regards!

In an acetic acid solution:

1. To make a buffer with pH = 5.00, have a ratio of

\(\frac{[A-]}{[HA]} = 10^{-5.50}\) = 0.316.

The volume of sodium hydroxide needed:

V(NaOH) = (0.316 M - 0.200 M) / 4.50 M = 0.0316 L = 31.6 mL

Therefore, 31.6 mL of 4.50 M sodium hydroxide must be added to 250.0 mL of 0.200 M acetic acid solution to make a buffer with pH = 5.00.

2. The pH of the buffer is calculated as follows:

pH = pKa + log(\(\frac{[A-]}{[HA]}\))

= 4.76 + log(0.2/0.1)

= 4.86

Therefore, the pH of the buffer is 4.86.

3. The mass of salt that must be dissolved in 0.25 dm³ of 1 mol dm³ propanoic acid to give a buffer of pH 4.87:

\(\frac{[A-]}{[HA]} = 10^{-4.87}\) = 0.0114

Therefore, the mass of acetate that must be dissolved:

Mass of acetate = (0.0114 mol dm³)(0.25 dm³) = 0.00285 g

Therefore, 0.00285 g of sodium propanoate must be dissolved in 0.25 dm³ of 1 mol dm³ propanoic acid to give a buffer of pH 4.87.

4. The pH of the buffer is calculated as follows:

pH = pKa + log(\(\frac{[A-]}{[HA]}\))

= 4.74 + log(0.1/0.1)

= 4.74

Therefore, the pH of the buffer is 4.74.

Find out more on pH here: https://brainly.com/question/26424076

#SPJ1

The heat evolved per gram of CuS roasted is -5.01 kJ/g.

The reaction is exothermic, with a delta H of -114.6 kJ/mol. This means that the reaction releases 114.6 kJ of heat for every mole of CuS that is converted to CuO. The reaction is carried out in a roaster, which is a large, industrial-scale furnace that is specifically designed for this process.

To solve the above problem, we need to determine the heat evolved per mole of CuS roasted, and then convert that to heat per gram of CuS roasted.

The heat evolved per mole of CuS roasted can be calculated using the given equation and the given value for the enthalpy change:

AH = -805.6 kJ/mol

We can then convert the heat evolved per mole to heat evolved per gram by dividing by the molar mass of CuS:

Heat per gram = (-805.6 kJ/mol) / (160.6 g/mol) = -5.01 kJ/g

Therefore, After roasting, the copper oxide is then leached with a solution of sulfuric acid to extract the copper. The resulting solution is then filtered and the copper is recovered from the solution through a process called electrowinning.

Learn more about copper from

https://brainly.com/question/26449005
#SPJ1

See full question below

The first step in the industrial recovery of copper from the copper sulfide ore is roasting, that is, the conversion of CuS to CuO by heating: 2CuS(s) + 302(g) → 2CuO(s) + 2802(g) AH = -805.6 kJ/mol Calculate the heat evolved (in kJ) per gram of CuS roasted.

The SI unit of pressure is the Pascal (Pa).

The boiling point of water is lower on Mount McKinley than the boiling point of water in NYC.

What is Pressure?

Pressure is defined as the amount of force applied perpendicular to the surface of an object per unit area over which that force is distributed. In other words, it is the force per unit area that an object exerts on another object. Pressure can be measured in various units such as pascal (Pa), bar, pounds per square inch (psi), and atmospheres (atm), among others. It is an important concept in physics and is used to describe many phenomena, including fluid dynamics, weather patterns, and even the behavior of gases in space.

At lower elevations, atmospheric pressure is higher compared to higher elevations.

Standard atmosphere or standard atmospheric pressure is equal to 101325 Pa.

Learn more about Pressure from given link

https://brainly.com/question/28012687

#SPJ1

Answer:

Se

Explanation:

SeO3 is trigonal planar molecule having all bond angles at about 120 degrees.

It is found in the fourth row and is a member of group sixteen. Its trioxo anion possess the structure shown in the question.

The element that forms an ion in the fourth row of the periodic table is Selenium (Se). Therefore option 1 is correct.

Selenium (Se) belongs to Group 16 of the periodic table and has an atomic number of 34. It can gain two electrons to achieve a stable electron configuration and form the Se²⁻ ion, also known as the selenide ion. In this ion, Selenium has a charge of -2 due to the gain of two electrons.

Selenium has six valence electrons and tends to gain two electrons to achieve a stable octet configuration, similar to the noble gas configuration of argon (Ar). By gaining two electrons, Selenium forms the Se²⁻ ion, also known as the selenide ion. In this ion, Selenium has a charge of -2.

Thus, The element that forms an ion in the fourth row of the periodic table is Selenium (Se).

Know more about Selenium:

https://brainly.com/question/2396770

#SPJ6

Answer:

dichlorine trioxide

Explanation:

di-2 tri-3 there are three oxygens and two chlorines.

Answer:

Dichlorine Trioxide

Explanation:

The molar mass and molecular weight of Cl2O3 is 118.904.

Answer:

A Beryllium (Be) atom has 2 electron shells, whereas a Barium (Ba) atom has 6 electron shells

Explanation:

Beryllium (Be) is an element in group two of the periodic table with atomic number 4 (Is2 2s2). On the other hand, barium (Ba) is an element in group 2 of the periodic table with atomic number 56. However, as stated in the question, the Beryllium (Be) atom is smaller than the Barium (Ba) atom.

This is because a Beryllium (Be) atom has 2 electron shells, whereas a Barium (Ba) atom has 6 electron shells. The electron shells of Barium contains more electrons, which is responsible for the large size of the Barium atom. Note that, the higher the number of atoms, the larger the atomic size.

Answer: CH3 is not an alkane. False

Explanation: The formula for alkane is given as:

Answer:

its A

Explanation:

The only one that makes sense

The number of moles of nitrogen, N in 65 moles of Pb(NO₃)₄ is 260 moles

We'll begin by obtaining the number of mole of N in one mole of Pb(NO₃)₄. Details below:

From the formula of Pb(NO₃)₄, we can see that there are 4 moles of N in 1 mole of Pb(NO₃)₄

With the above information, we can determine the number of mole of N in 65 moles of Pb(NO₃)₄. This is illustrated below:

1 mole of Pb(NO₃)₄ contains 4 moles of N

Therefore,

65 mole of Pb(NO₃)₄ will contain = (65 moles × 4 moles) / 1 mole = 260 moles of N

Thus, we can conclude from the above calculation that the number of mole of N is 260 moles

Learn more about mole:

https://brainly.com/question/13314627

#SPJ1

Answer:

Mercury

Explanation:

Hope this Helps!

Mercury has the most elliptical orbit.

We have Solar System.

We have to find out which planet has the most elliptical orbit.

An ellipse is the set of all points on a plane whose distance from two fixed points (called foci) add up to a constant.

According to the question -

Whether the ellipse will be more flattened or round it depends upon the eccentricity of the ellipse. The eccentricity of the ellipse is the ratio of distance between focal points and length of major axis. Mathematically-

\($e=\frac{c}{a}\)

Now -  e is \(\alpha\) a (c = constant). Greater is the a, larger will be e and

0 < e < 1.

In the solar system mercury has the most elliptical orbit with the maximum eccentricity of 0.2056.

Hence, Mercury has the most elliptical orbit.

To solve more questions on Ellipse, visit the link below-

https://brainly.com/question/490188

#SPJ2