How many free neutrons are produced in each of the following uranium-235 fission reactions. (Please explain)

Answer: maybe a choking hazard for the ones with wires

Explanation:

The main difference between Proton, Neutron and Electrons can be found in their charges. Protons are positively charged and neutrons are neutral whereas electrons are negatively charged. Protons are found in the nucleus of the atom, and they reside together with neutrons. ... Protons are positively charged.

Answer: D

Explanation:

Answer: B

Explanation: Those are the steps and I took the quiz and got it right

Pseudo in chemistry means a reaction which is not first-order reaction naturally but made first order by increasing or decreasing the concentration of one or other reactant is known as Pseudo first order reaction.Pseudo means "fake".

Answer:

1200

Explanation:

bc 12x20x5

Answer:

The volume of the rectaganle is 1200cm.

Explanation:

U take Length×width×height

so l×w×h = 12cm × 20 cm × 5cm

Answer:

A compound can have more than one chemical formula and still be considered the same compound.

Explanation:

Which of these are not true statements a compound?

A compound's properties are usually not the same as the properties of the elements that make it up.  TRUE. For instance, the salt NaCl has different properties than the solid metal Na and the gaseous nonmetal Cl₂.

A compound always has the same composition.  TRUE. The ratio of elements in a compound is constant.

A compound is made up of more than one type of atom.  TRUE. Unlike elements, compounds are formed by 2 or more elements.

A compound can have more than one chemical formula and still be considered the same compound. FALSE. Each compound can have only one chemical formula.

Answer:

B and D could be true

Explanation:

A volume of sodium hydroxide less than expected could occurs for two reasons:

The real concentration of sodium hydroxide was higher than expected or the amount of vinegar added was less than expected:

A. The sodium hydroxide solution had been allowed to stand exposed to the air for a long time prior to the titration.  FALSE. A long expose  to the air decreases concentration of the NaOH.

B. The volumetric flask used to prepare the diluted vinegar solution was rinsed with water prior to use.  TRUE. You add a less amount of vinegar doing you require less amount of NaOH than expected.

C. The burette used to deliver the sodium hydroxide solution was rinsed with water prior to use.  FALSE. Thus, you add a less amount of NaOH than expected. To explain the matter, you add more NaOH than expected.

D. The pipette used to deliver the vinegar solution was rinsed with water prior to use. TRUE. Again, you are adding a less amount of Vinegar than expected doing the necessary NaOH during titration less than expected

Answer:

ΔH = -59.6kJ/mol

Explanation:

The reaction that occurs between Ag⁺ and Cl⁻ ions is:

Ag⁺ + Cl⁻ → AgCl(s) + ΔH

To find ΔH we need to obtain moles of reaction and heat released in the reaction because ΔH is defined as heat released per mole of reaction.

Moles of reaction:

Moles of Ag⁺ and Cl⁻ added are:

Ag⁺: 0.100L * (0.100mol / L) = 0.01moles

Cl⁻: 0.100L * (0.200mol / L) 0 0.02 moles

That means limiting reactant is Ag⁺ and moles of reaction are 0.01 moles

Heat released:

To find heat released we must use coffe cup calorimeter equation:

Q = C*m*ΔT

Where C is specific heat of solution (4.18J/g°C), m is the mass of solution (200g because there are 100 + 100mL = 200mL and density of solution is 1g/mL) and ΔT is change in temperature (25.30°C - 24.60°C = 0.70°C).

Replacing:

Q = C*m*ΔT

Q = 4.18J/g°C * 200g * 0.70°C

Q = 585,2J

Is total heat released.

The calorimeter absorbs:

15.5J / °C * 0.7°C = 10.85

Thus, when 0.01 moles reacts, 585.2J + 10.85  = 596.05J are released (Heat released is heat abosrbed by calorimeter + Heat absorbed by water) and ΔH is:

ΔH = 596.05J / 0.01 moles =

ΔH = 59605J / mol =

As heat is released, ΔH < 0.

Answer:

toilet seat and washing of hands ✋ very well

Answer:

55000 (put a line above the second 5)

Answer:

barium-146

Explanation:

Beta emission is said to occur when a neutron is converted to a proton, an electron and a neutrino. Beta emission leads to a decrease in the Neutron/Proton ratio.

Beta emission is common for heavier nuclei having a large number of neutrons. Barium-146 has 90 neutrons, hence it is more likely to undergo beta emission than other nuclides stated among the options.

Answer:

The magnesium reacts with the acid, producing visible bubbles of hydrogen gas. (Optional) If the flame of a butane fireplace lighter is held above the bursting bubbles, they will produce audible pops as the hydrogen ignites. Magnesium ribbon is a flammable solid. Hydrochloric acid is a corrosive liquid.

Explanation:

Magnesium reacts with hydrochloric acid according to the equation: Mg(s) + 2 HCl(aq) --> MgCl2(aq) + H2(g) This demonstration can be used to illustrate the characteristic reaction of metals with acid, a single replacement reaction, or to demonstrate the generation of hydrogen gas.

The reaction between the magnesium metal and hydrochloric acid can be represented as:

[tex]Mg(s) + 2HCl(aq) \longrightarrow MgCl_2(aq) +H_2(g)[/tex]

The chemical reaction between magnesium metal and dilute hydrochloric acid can be described as a redox reaction where both reduction and oxidation will take place.

The following chemical reaction Mg and HCl will take place as:

[tex]Mg(s) + 2HCl(aq) \longrightarrow MgCl_2(aq) +H_2(g)[/tex]

The oxidation state of Mg changes from 0 to +2, Mg is getting oxidized to magnesium cation, Mg²⁺ whereas the oxidation state of Hydrogen of HCl is changed from + 1 to 0 and is getting reduced.

Therefore, Magnesium acts as a reducing agent, and hydrogen acts as an oxidizing agent in this reaction. There is a formation of magnesium chloride and hydrogen gas is liberated.

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Answer:

D.

Explanation:

Apex

Scientists use the data which they collect  to decide if there is support for an experiment's conclusions and to test if it is in support or against the hypothesis proposed.

Hypothesis can be defined as an assumption which is made for the sake of argument . It is an interpretation of a practical condition for which action needs to be taken.It is defined as a tentative assumption which is made to test logical consequences.It is an antecedent clause of a statement which is conditional.

It is constructed before research. There are six types of hypothesis 1)simple hypothesis 2) complex hypothesis 3) directional hypothesis 4)non-directional hypothesis 5) null hypothesis 6)casual hypothesis

The hypothesis should be clear and precise, it must be specific and way of explanation of hypothesis should be simple.

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Answer:

n = 0.271 moles

Explanation:

Given that,

Volume of container, V = 14 L

Pressure of Nitrogen gas, P = 375 torr

Temperature. T = 37°C=37+273=310°C

We need to find the number of moles of nitrogen in the container. Using gas equation,

PV = nRT

R is gas constant, R = 0.082 L-atm/mol-K

Since, 1 atm=760 torr

375 torr = 0.493 atm

Now,

[tex]n=\dfrac{PV}{RT}\\\\n=\dfrac{0.493\times 14}{0.082\times 310}\\\\n=0.271[/tex]

So, there are 0.271 moles of Nitrogen in the container.

The ideal gas law, also called the general gas equation, is the equation of the state of a hypothetical ideal gas.

The ideal gas law work under the constant:-  

Hence the formula we gonna use is as follows:-

[tex]PV = nRT[/tex]

In the question, the pressure, temperature, and volume are given in two different systems.

As the date given in the question, after putting it into the equation:-

[tex]n= \frac{PV}{RT}[/tex]

[tex]n = \frac{0.493*14}{0.082 *310}[/tex]

n= 0.271.

The number of moles in the nitrogen container is 0.271.

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The electronic configuration of ‘N’ atom is 2, 5 and to have Octet in the valence shell it requires three more electrons.When two nitrogen atoms approach each other, each atom contributes 3 electrons for bonding.There are six electrons shared between two nitrogen atoms in the form of three pairs.Therefore, there is a triple bond between two nitrogen atoms in $N _{ 2 }$ molecules.

Answer:

The UTF-8 replaced ASCII because it contained more characters than ASCII that is limited to 128 characters.

Explanation:

Both ASCII UTF-8 are used for encoding characters in computer communication. UTF-8 was favored over ASCII because it provided more characters than is available in ASCII making it more acceptable world over. Also, UTF-8 can be used for many different alphabets from around the world unlike ASCII which is limited to only languages that use the Latin Alphabet.

Unicode characters are encoded into 8 bit byte sequence by UTF-8

The reason why UTF-8 replaces ASCII character-encoding standard is due to the advantages, broader scope, and utility of UTF-8 compared to ASCII, which includes;

Due to the above mentioned advantages, the UTF-8 is the preferred character encoding for a wider variety of user, making it to replace the ASCII

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Answer: 27.1 g of solid chromium(III) acetate should be added.

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

[tex]Molarity=\frac{n\times 1000}{V_s}[/tex]

where,

n = moles of solute

[tex]V_s[/tex] = volume of solution in ml

moles of [tex]Cr(CH_3COO)_3[/tex] = [tex]\frac{\text {given mass}}{\text {Molar mass}}=\frac{xg}{229g/mol}[/tex]

Now put all the given values in the formula of molality, we get

[tex]0.237=\frac{xg\times 1000}{229g/mol\times 500ml}[/tex]

[tex]x=27.1[/tex]

Therefore, 27.1 g of solid chromium(III) acetate should be added.

Answer : 1721.72 g/qt are in 18.2 g/cL

Explanation :

As we are given: 18.2 g/cL

Now we have to convert 18.2 g/cL to g/qt.

Conversions used are:

(1) 1 L = 100 cL

(2) 1 L = 1000 mL

(3) 1 qt = 946 qt

The conversion expression will be:

[tex]\frac{18.2g}{1cL}\times \frac{100cL}{1L}\times \frac{1L}{1000mL}\times \frac{946mL}{1qt}[/tex]

[tex]=1721.72\text{ g/qt}[/tex]

Therefore, 1721.72 g/qt are in 18.2 g/cL

A crystalline form of solid fat is Glycerides

Hope it helped :)

Answer:

57.09 g/mol

Explanation:

Step 1: Find the mass for every 1 mole in each element

Ca - 40.08 g/mol

O - 16.00 g/mol

H - 1.01 g/mol

Step 2: Add the masses to find total mass

40.08 + 16.00 + 1.01 = 57.09 g/mol

So we have 57.09 grams per every mole in Calcium Hydroxide.

Answer:

ΔEN CO   = 1.0

Explanation:

To calculate the electronegativity difference, we have to substract the element which has the highest EN to the other, that has a low value.

For this case EN from O - EN from C

Electronegativity is a property of the periodic table that increases diagonally, where Fr and Rb are the elements of less EN while F is the most electronegative element, with a value of 4. This is because F is an element with a high ionization energy and a negative electronic affinity.

ΔEN CO  = 3.5 - 2.5 = 1.0

Electronegativity (EN) describes the ability of an atom to compete for

electrons with other atoms to which it is attached.

Answer:

4

Explanation:

Four significant figures

Answer:

hope your having a blessed day

Explanation:

Explanation:

We know :-

Molecular mass of H2O = 18 u

Molar mass = 18 g

Then no of moles = Mass given ÷ Molar mass

= 11 ÷ 18

= 0.611111..

or = 0.61

Answer:

2.90 × 10⁻³

Explanation:

Step 1: Given data

pH: 1.80

Concentration of the weak acid (Ca): 0.086 M

Step 2: Calculate the concentration of H⁺

We will use the following expression.

pH = -log [H⁺]

[H⁺] = antilog -pH = antilog -1.80

[H⁺] = 0.0158 M

Step 3: Calculate the acid dissociation constant (Ka)

We will use the following expression.

Ka = [H⁺]² / Ca

Ka = 0.0158² / 0.086

Ka = 2.90 × 10⁻³

Answer:

Mass:

1) Definition : Mass is the quantity of matter possessed by the body.

2) Quantity : Mass is a scalar quantity

3) Measurement: Mass is measured by ordinary balance

4) Unit : Unit of mass is kilograms in SI units.

5) Formula : m = W/g

Weight:

1) Definition: The gravitational force of attraction is called weight.

2) Quantity : Weight is a vector quantity.

3) Measurement : It is measured by spring balance

4) Unit : Unit of Weight is Newton in SI units.

5) Formula : W = mg  [Where m is mass and g is acceleration due to gravity]

Answer:

Mass is how big an item is while weight is how heavy or light an item is. The mass of a human stays the same weather on Earth or on the Moon. While weight will be different on the Moon rather than on Earth.

Explanation:

Answer:

All microscopes allow visualization of samples that are too small to be viewed by the naked eye. Microscopes let scientists make observations of microscopic objects.

Explanation:

Answer:

1. pOH = 2.4

2. pOH = 10.34

3. pH = 2.14

Explanation:

1. Determination of the pOH.

Concentration of Hydroxide ion, [OH-] = 0.004 M

pOH =?

pOH = - log [OH-]

pOH = - log (0.004)

pOH = 2.4

Therefore, the pOH of the solution is 2.4

2. Determination of the pOH.

pH = 3.66

pOH =?

pH and pOH are related by the following equation:

pH + pOH = 14

With the above formula, we can obtain the pOH of the solution as follow:

pH = 3.66

pOH =?

pH + pOH = 14

3.66 + pOH = 14

Collect like terms

pOH = 14 - 3.66

pOH = 10.34

Therefore, the pOH of the solution is 10.34

3. Determination of the pH.

Molarity of HCl = 0.0072 M

Concentration of Hydrogen ion, [H+] =?

Thus, we can obtain the concentration of Hydrogen ion, [H+] as follow:

HCl(aq) —> H+(aq) + Cl-(aq)

From the balanced equation above,

1 mole of HCl produced 1 mole of H+.

Therefore, 0.0072 M HCl will also produce 0.0072 M H+.

Therefore, the concentration of Hydrogen ion, [H+] in the solution is 0.0072 M.

Finally, we shall determine the pH of the solution as follow:

Concentration of Hydrogen ion, [H+] = 0.0072 M.

pH =?

pH = - log [H+]

pH = - log (0.0072)

pH = 2.14

Therefore, the pH of the solution is 2.14

Answer:

c. decarboxylation of an a-keto acid.

Explanation:

Decarboxylation refers to the removal of the carboxyl group from a carboxylic acid and thus releasing carbon dioxide. Decarboxylases are enzymes that speed up the removal of the carboxyl group from acids. These reactants could be amino acids, alpha-keto acids, and beta-keto acids. Biotin is known to catalyze the decarboxylation of malonyl CoA to acetyl CoA during fatty acid synthesis.

Malonyl CoA is converted to acetyl CoA after decarboxylation assisted by biotin also known as Vitamin H. Alpha keto acids are involved in fatty acids synthesis and Malonyl CoA is an alpha-keto acid because the keto group is located in the first carbon near the carboxylic acid group. Keto acids have both a carboxyl group and a ketone group.

Answer:

Answer is in the explanation

Explanation:

In an extraction process, you want to take the higher amount of a compound. You can make this due solubility of the compound in a particular solvent.

The higher solubility of the compound in the solvent, the higher extraction of the compound from the original mixture.

Solubility of caffeine in water is about 16mg/mL in water at room temperature. But in 1,2-dichloroethane is about 100mg/mL.

Thus, the reason of the better extraction with 1,2-dichloroethane is because of  the high solubility of caffeine in this solvent.

The reason for 1,2 dichloroethane a better solvent should be explained below.

In the case of the extraction process, Here we considered the greater amount of a compound. The higher solubility of the compound should be in the solvent, the higher extraction of the compound should be from the original mixture.

Thus, it should be better due to the high solubility of caffeine in this solvent.

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