In a neutralization reaction with a strong acid or base, all of the hydrogens from the acid and the hydroxides from the base react to form water.
Balance the following neutralization reaction:
H3PO4 (aq) + NaOH (aq) â H2O (l) + Na3PO4 (aq)
Enter the appropriate coefficient to the left of the respective term. In the event that your coefficient would be "1" be sure to write "1" as opposed to leaving it blank.

If 60 grams of the substance are added to 100 g of water, the solution can be categorized as supersaturated.

The graph shows the number of grams that can be dissolved in 100 grams of water at different temperatures. In general, solubility increases with temperature.

According to the graph, at a temperature of 30°C, it is possible to dissolve a total of 48 to 49 grams of \(KNO_{3}\). This information implies that if we add 60 grams at this temperature not all the substance would be dissolved, and therefore the solution would be supersaturated.

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Answer:

Answer is D. All of the above

Answer:

17202.6 years

Explanation:

Activity of the living sample (Ao) = 160 counts per minute

Activity of the wood sample (A) = 20 counts per minute

Half life of carbon-14 = 5730 years

t= age of the artifact

From;

0.693/t1/2= 2.303/t log Ao/A

Then;

0.693/ 5730= 2.303/t log Ao/A

Substituting values;

0.693/5730= 2.303/t log (160/20)

Then we obtain;

1.209×10^-4 = 2.0798/t

t= 2.0798/1.209×10^-4

Thus;

t= 17202.6 years

Therefore the artifact is 17202.6 years old.

Answer:

Electrolysis is a process in which an electric current is used to drive a chemical reaction that would not otherwise occur.

When an electric current is passed through the cell, the ions in the electrolyte solution are attracted to the electrodes and undergo a chemical reaction at the surface of the electrodes.

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Answer:

C₄H₁₀ + O₂ --> CO₂ + H₂O

Explanation:

The other reactant is stated below the reaction, which is oxygen.

Oxygen is a diatomic element meaning there are usually 2 bonded oxygens. O is incorrect since oxygen is never found as a single atom.

The products are stated below the question. The products are:

- Carbon dioxide

- Water

The chemical formula for carbon dioxide is CO₂

The chemical formula for water is H₂O

Both of the above formulas are very common and are widely known.

Answer:

FeP, which is iron (III) phosphide.

Explanation:

Hello,

In this case, when iron (III) ion and phosphide ion react, the following compound is formed as the charges are exchanged to each other at the subscripts:

\(Fe^{3+}+P^{3-}\rightarrow Fe_3P_3\)

Yet, since the three could be simplified to 1 at both Fe and P, we obtain:

\(Fe^{3+}+P^{3-}\rightarrow FeP\)

Which is known as iron (III) phosphide.

Best regards.

Answer:

see below

Explanation:

The lake will have more total thermal energy but the particles in the coffee will be moving faster.

A comparison of hot coffee and cold lake is, the heat from the coffee will be absorbed by the cold lake through convection method of heat transfer.

The principle of conservation of energy states that the total energy of an isolated system is always conserved.

Heat lost by the hot coffee = Heat absorbed by the cold lake

Heat from the coffee will be absorbed by the cold lake through convection method of heat transfer.

Thus, a comparison of hot coffee and cold lake is, the heat from the coffee will be absorbed by the cold lake through convection method of heat transfer.

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Answer:

1.58 g Pt

Explanation:

one mole of platinum weighs 195.09 grams (195.09 g/mol).

to convert moles of platinum to grams, we simply multiply the given moles of platinum by 195.09 to convert it to grams.

0.00808 x 195.09 = 1.576 g

Taking into account the reaction stoichiometry, 36 grams of water (option B) will be produced if you start with 4.0 grams of hydrogen and an excess of oxygen.

In first place, the balanced reaction is:

2 H₂+ O₂  → 2 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

You can see that by reaction stoichiometry 4 grams of H₂ form 36 grams of H₂O.

In summary, 36 grams of water (option B) will be produced if you start with 4.0 grams of hydrogen and an excess of oxygen.

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Potassium permanganate is not used as primary standard because is not able to release in MnO2 in the reaction. According to the above discussion, we conclude KMnO4 is used as the secondary standard. It is also hygroscopic in nature.

What is Secondary Standard solution?

A solution created especially for a certain analysis is known as a secondary standard solution. A substance whose active agent contents have been identified by comparison with a primary standard is referred to as a secondary standard. This indicates that it is frequently standardized against a fundamental standard.

Analytical tools and methodologies are calibrated using secondary standard solutions.

The molecular formula of potassium permanganate is KMnO4. Potassium permanganate is one of the oxidising agents in chemistry. Potassium permanganate is not used as primary standard because is not able to release in MnO2 in the reaction. Potassium permanganate is always in the stable form. The reason KMnO4 is also used as a colour indicator in analysis.

According to the above discussion, we conclude KMnO4 is used as the secondary standard. It is also hygroscopic in nature.

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While having experienced polar explorers at the Catlin Arctic Survey would have been beneficial in many ways, it would also have been important for them to work collaboratively with the rest of the team.

Advantages:

Experienced polar explorers would have had a wealth of knowledge and skills, such as how to travel over the ice, how to set up camp, and how to handle emergencies.

Experienced polar explorers would have been able to make informed decisions about the best routes to take and the most efficient ways to travel. This could have helped to save time and energy.

Disadvantages:

Experienced polar explorers may have been set in their ways and resistant to new ideas. This could have hindered the team's ability to adapt to changing circumstances and make the most of new opportunities.

Experienced polar explorers may have been overconfident and taken risks that the rest of the team was not comfortable with. This could have put everyone's safety at risk.

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An ionic compound is one that dissolves in water to produce a solution with a pH of 11, has a high melting point, conducts electricity when molten, and burns in oxygen.

Positively charged ions, which are sometimes called as cations, and negatively charged ions, also called as anions together constitute an ionic compound, which are neutral substances. The name of the cation is written first, followed by the name of the anion, in case of binary ionic compounds (ionic compounds that only contain two types of elements).

An atom can establish bonds with other atoms in two main ways: covalent and ionic. Sharing of electrons between two or more atoms is involved in case of covalent bonding. When two or more ions come together, they can form ionic bonds that are held together by charge differences.

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Answer:

No

Explanation:

Argon has a larger atomic radius

Answer:

87.5 %

Explanation:

Step 1: Given data

Step 2: Calculate the percent yield

When working with chemical reactions, we can determine the efficience in obtaining a product measuring the percent yield. The theoretical yield is the maximum amount of product that we could obtain according to the stoichiometry, whereas the real yield is the amount of product that we actually obtain when we carry out the process. We can calculate the percent yield usign the following expression.

%yield = real yield / theoretical yield × 100%

%yield = 105 kg / 120 kg × 100%

%yield = 87.5 %

Answer: C. Melting Ice

Explanation: The rest are chemical changes, the ice is the same substance (water), just changing physical forms, solid --> liquid

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.

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Thus, the total pressure is 0.184 atm.

What is Pressure?

The amount of pressure exerted (thrust) on a floor in line with unit place is described as ‘pressure’. It can also be defined as the ratio of the force to the place (over which the pressure is performing).

The force applied perpendicular to the surface of an object in step with unit vicinity over which that force is sent.

PV=nRT is the ideal gas equation.

Where P denotes pressure, V denotes volume, n is the number of moles, R denotes the gas constant, and T denotes temperature.

As a result, the temperature of the  sample will only be doubled, with the same volume and number of moles. Because temperature and pressure are inextricably linked, if one rises, the other must rise as well, resulting in a pressure of 0.092 atm.

The following are the steps in the breakdown process: Decomposition reaction:  ⇄  +

As a result, 1 mole of   produces 2 moles of products (1 of each), and n doubles. The pressure will double to 0.184 atm since the volume and temperature are now constants, and the pressure is directly proportional to the number of moles.

Thus, the total pressure is 0.184 atm.

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Sodium which is an element and is a metal has a symbol of 'Na' that represents the one atom of an element.

It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.

Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.

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Answer:

Density of the sample in Kg/L is 8kg/L.

Explanation:

we know that density of a substance can be calculated if we know the mass and volume of the substance.

In this case mass, (M) = 320 g

and Volume (V) = 40 ml

we know that density (ρ) = \(\frac{Mass}{Volume}\) = \(\frac{320}{40}\) g/ml = 8 g/ml

We also know that 1kg = 1000g and 1litre = 1000ml

so to convert g/ml to kg/l

ρ = (8 × \(\frac{1000}{1000} \fra\) )Kg/L = 8 Kg/L

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Answer:

A property that changes if the amount of substance changes

Explanation:

An extensive property is a property that depends on the amount of matter in a sample.

Answer:

Explanation:"Carbon can form single, double, or triple bonds with another carbon atom."

Carbon atoms has 6 electrons, therefore #1 is incorrect And carbon bonds usually increase the melting point of molecules. #2 is incorrect.

Answer:

Mass number (A) is the number of nucleons (proton and neutron) present in a atom.

Explanation:

electrons don't cout since they are thousandth's of the mass of protons or neutrons

Answer:

Explanation:

We can use the formula:

q = mcΔT

where q is the heat absorbed, m is the mass, c is the specific heat, and ΔT is the change in temperature.

Given:
specific heat of iron (c) = 0.449 J/g°C
initial temperature (T1) = 24.0°C
final temperature (T2) = 82.1°C
heat absorbed (q) = 948.0 J

Substituting the given values into the formula, we get:

q = mcΔT
948.0 J = m(0.449 J/g°C)(82.1°C - 24.0°C)
948.0 J = m(0.449 J/g°C)(58.1°C)
m = 948.0 J ÷ (0.449 J/g°C × 58.1°C)
m = 33.1 g

Therefore, the mass of the iron piece is 33.1 g (to three significant figures)

Answer:

3 half-lives 7. An isotope of Cesium (Cesium-137) has a half life of 30 years. If 1.0 mg of cesium-137 disintegrates over a period of 90 years, how many mg of cesium-137 would remain? of sodium-25 is 60 seconds? : 3 minutes t=601 = 3 half-lives 5.0mg ~ 2.5 mg + 1.25mg →) 625 mg.

Explanation:

Hope this helps

       where:

      \(N_{0}\) = Initial quantity of the sample = 1.0g

       t = time in years of disintegration = 90 years

      \(t\frac{1}{2}\) = Half life of cesium isotope = 30 years

      N(t) = Quantity of substance after disintegration = ?

N(t) =  \(1 ( \frac{1}{2})^ \frac{90}{30}\)

N(t) =  \(1 (\frac{1}{2})^{3}\)

N(t) = 0.125 grams

Therefore, the quantity of cesium-137 that would remain after disintegrating over a period of 90 years is 0.125 grams.

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At ambient temperatures, it is a gas. A periodic table element is phosphorus. It belongs to group 15 of the periodic table and is categorised as a nonmetal.

It is well known that nonmetals differ from metals in both their physical and chemical characteristics. The right response is D. At ambient temperatures, it is a gas. At room temperature, nonmetals may exist in all three states of matter: liquid, gas, and solid.

With a boiling point of 44.2 °C, phosphorus is a nonmetal that is a gas at ambient temperature. It is neither highly glossy nor an excellent heat conductor.

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Enthalpy change (H) and entropy change (S) are 11.7 103 Jmol-1 and 105 Jmol-1K-1, respectively, for a reaction at 25 °C.

The absolute entropies of a reactants and their products are S°(N2H4) (= half of this period J/(mol•K), S°(N2) = 191.6 J/(mol•K), or S°(H2) = 130.7 J/(mol•K) at 25°C, where the standard enthalpy change (H°) is 50.6 kJ/mol.

E0 is known as 0.268 V at standard potential at 25°C, despite a slight variation in the computed value above. Similar to a silver-silver chloride electrode, the electrode potential is dependent on the chloride ion concentration.

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Answer:

880.5

Explanation:

Express the result of adding 856.6g and 23.86g to the correct number of significant figures.

856.6 +23.86  = 856.6 + 23.9 = 880.5

The result of adding 856.6 g and 23.86 g after rounding off to correct significant figures is 856.6 + 23.9=880.5.

Significant figures are used for establishment  of a number which is presented in the form of digits. These digits give a meaningful representation  to the numbers.

The significant figures are the significant digits which convey the meaning according to the accuracy. These provide precision to the numbers and hence are called as significant numbers.There are rules for counting significant figures which are as follows:

1)All non-zero digits are significant .

2)All zeroes which occur between non-zero digits are significant.

3)All zeroes to the left and right of  a non-zero digit are not significant.

4) All zeroes on right  of decimal are significant if a non-zero number follows them.

5)All zeroes on right side of non-zero digit are significant.

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