determine the type of each chemical equation describing a precipitation reaction. c a 2 ( a q ) s o 4 2 − ( a q ) ⟶ c a s o 4 ( s ) cax2 (aq) sox4x2−(aq)⟶casox4(s) choose...

The question is incomplete, the complete question is:

Standardization of a Borax solution (Na2B4O7). A student titrates a 20.00 mL sample of an aqueous borax solution with 1.044 M H2SO4. It takes 2.63 mL of acid to reach the equivalence point. Knowing it takes 1 H2SO4 to neutralize 2 Na2B4O7, what was the concentration of this Borax solution?

Answer: The concentration of borax solution is 0.069 M.

Explanation:

To calculate the concentration of borax solution, the formula used is:

\(n_1C_1V_1=n_2C_2V_2\) ....(1)

where,

\(n_1, C_1\text{ and }V_1\) are the n-factor, concentration and volume of sulfuric acid

\(n_2,C_2\text{ and }V_2\) are the n-factor, concentration and volume of borax solution.

We are given:

\(n_1=1\\C_1=1.044M\\V_1=2.63mL\\n_2=2\\C_2=?M\\V_2=20mL\)

Putting values in equation 1, we get:

\(1\times 1.044\times 2.63=2\times C_2\times 20\\\\C_2=\frac{1\times 1.044\times 2.63}{2\times 20}\\\\C_2=0.069M\)

Hence, the concentration of borax solution is 0.069 M.

The mass of potassium chlorate is 0.3439 to generate 114.0 L  \(O_{2}\) at 0.720 atm and 291K

The decomposition of potassium chlorate is represented as

\(2KClO_{3} (s) - > 2KCl(s) + 3O_{2} (g)\)

Given, Volume = 114.0 L

pressure = 0.720 atm

temperature = 291 K

According to the Ideal gas Equation

Pv = nRT

\(n=\frac{Pv}{RT}\)

\(n=\frac{0.720*114.0}{0.82*291}\)

n= 0.3439

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Answer:

There are 4 carbon atoms present.

Explanation:

Answer:

Nuclear fusion is a reaction in which two or more atomic nuclei are combined to form one or more different atomic nuclei and subatomic particles (neutrons or protons).

Answer

47.73 g CuO

Explanation

Given:

Chemical equation: 3CuO+ 2H3PO4 = Cu3(PO4)2 + 3H20

mass of orthophosphate acid (Cu3(PO4)2) = 39.2 g

Required: The mass of CuO

Solution:

Second method:

Step 1: Find the moles of H3PO4

n = m/M where m is the mass and M is the molar mass of H3PO4

n = 39.2g/97.994g.mol^-1

n = 0.400 mol

Step 2: Use the stoichiometry to find the moles of CuO

The molar ratio between CuO and H3PO4 is 3:2

Therefore the moles of CuO = 0.400 mol x (3/2) = 0.600 mol

Step 3: Find the mass of CuO, now that we have moles

m = n x M m is the mass, n is the moles and M is the molar mass

m = 0.600 mol x 79,545 g/mol

m = 47.73 g

it is not table salt

Explanation:

Table salt dissolves in water.

Answer:

If a neutral atom has 22 protons inside its nucleus, it will have 22 electrons orbiting the nucleus.

Explanation:

An atom is the smallest amount of matter that undergoes chemical changes and is made up mainly of subatomic particles: electrons, protons and neutrons. The atomic nucleus is made up of protons, with a positive electric charge, and neutrons, which have no charge, while electrons, with a negative electric charge, revolve around the nucleus.

A neutral atom is one that lacks an electrical charge due to a trade-off between the number of its protons and electrons. In other words, although it has an electric charge, it is balanced between protons, electrons and neutrons. So in a neutral atom, the number of electrons equals the number of protons because the negative charge of the electrons is offset by the positive charge of the protons.

If a neutral atom has 22 protons inside its nucleus, it will have 22 electrons orbiting the nucleus.

In case, if a neutral atom possess 22 protons within its nucleus, it will also possess 22 electrons orbiting the nucleus.

It is as atom, which contains the same number of protons as well as electrons. The neutral atoms can be converted to positively charged ions by withdrawing one or more electrons. However, in the formation of an ion, there is no change in the number of protons.

The number of protons in the nucleus of an atom shows its atomic number, however, in case of a neutral atom, it is also equivalent to the number of electrons.

Thus, if a neutral atom possess 22 protons within its nucleus, it will also contain 22 electrons orbiting the nucleus.

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The surface temperature of a block of solid carbon dioxide (dry ice) is -78.5 degrees Celsius (-109.8 degrees F). Once it reaches this temperature, carbon dioxide completely bypasses the liquid state and transforms into a gas. One pound of dry ice produces 250 liters of carbon dioxide gas!

Carbon dioxide in the form of dry ice is employed. Sublimation is the process by which CO2 transforms from a solid to a gas without first undergoing a liquid phase, and it takes place at pressures lower than 5.13 atm and temperatures higher than 56.4 °C (216.8 K; 69.5 °F) (the triple point).

When a substance changes immediately from a solid to a gas without melting beforehand. The carbon dioxide is still present; it simply passes.

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Answer:

Sublimation

Explanation:

C

Answer:

Without the respiratory system your blood would be useless. The circulatory and respiratory systems work together to circulate blood and oxygen throughout the body

Explanation:

The correct answer is option (a) "Assertion and reason both are correct statements and reason is correct explanation for assertion.

An assertion is a declaration that someone believes to be true, while a reason is an explanation of why someone believes something. These two terms are commonly used in competitive tests to assess a student's comprehension of a specific subject, and a statement of assertion followed by a statement of reason is given. Students are required to determine if the assertion and reason are accurate or false. Students must choose the correct answer from a list of choices, which is a difficult task when they lack the requisite knowledge about the subject. Let's look at the answers to the given statements.i) Assertion: Physical adsorption of molecules on the surface requires activation energy.Reason: Because the bonds of adsorbed molecules are broken.Answer: Option (a) "Assertion and reason both are correct statements and reason is a correct explanation for assertion."ii) Assertion: The catalytic converter in the car’s exhaust system converts polluting exhaust gases into nontoxic gases.Reason: Catalytic converter contains a mixture of transition metals and their oxides embedded in the inner support.Answer: Option (a) "Assertion and reason both are correct statements and reason is a correct explanation for assertion."iii) Assertion: If a finely divided mixture of clay and charcoal is shaken with water and benzene, the clay will remain in water layer and charcoal will concentrate at the interface between the two liquids.Reason: In the adsorption of acetic acid from aqueous solution by charcoal it is assumed that a multi molecular layer of adsorbed substance is formed.Answer: Option (a) "Assertion and reason both are correct statements and reason is a correct explanation for assertion."iv) Assertion: Adsorption is a surface phenomenon.Reason: The intermolecular forces at the surface of the adsorbent are unequal in different directions.Answer: Option (a) "Assertion and reason both are correct statements and reason is a correct explanation for assertion."Therefore, the correct answer is option (a) "Assertion and reason both are correct statements and reason is a correct explanation for assertion."

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Answer:

If mass remains the same while the volume of a substance changes, the density of the substance will also change.

Answer:

BELOW

Explanation:

If mass remains the same while the volume of a substance decreases the density of the substance will increase.

Answer:

Giant structures are usually arranged in to giant regular lattices and they are extremely strong because they have many bonds involved. Simple molecules are just normal molecules as the name suggests like CO². though it contains strong covalent bond it still has weak intermolecular forces

Explanation: when your account gets to deleted and your trying to get your points up lol

The heat released in each reaction is:

Reaction 1: 3700J

Reaction 2: 3200J

What is heat?

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Answer:

Explanation: the answer is in the picture

Answer:

False

Explanation:

Forms of a given element that have a different number of neutrons are called isotopes.

Answer:

D

Explanation:

there are 5 electrons in the outer shell of the first picture

According to electronic configuration, model 1 shows 5 electrons in the outer shell of the atom.

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

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When k1 > k2, the KM is most analogous to the Kd. This is because KM is the concentration of substrate at which the reaction rate is half of its maximum velocity, and Kd is the dissociation constant, which is the concentration of ligand at which half of the receptor binding sites are occupied.

In both cases, they represent the affinity of the enzyme or receptor for the substrate or ligand, respectively. The Ka is the association constant, which is the inverse of Kd, and is not directly related to KM. The Kcat is the turnover number, which represents the maximum number of substrate molecules converted to product per unit time by a single enzyme molecule when it is saturated with substrate, and 1/Kcat is the catalytic efficiency, which is not directly related to KM either.
When k-1 > k2 (the rate constant for dissociation of the enzyme-substrate complex is greater than the rate constant for conversion to product), the KM is most analogous to: 1) the Kd

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Answer:

Physical state of reactants

Temperature

Concentration of reactants

Presence of a catalyst

Explanation:

The larger the surface area of a reactant, the faster the rate of the reaction. If the reactant is in powdered form, the reaction takes place faster than when the reactant is in solid or block form. This is due to the fact that the latter has larger surface area

Increase in temperature causes reactant molecules to gain kinetic energy thus increasing the rate if reaction

This would affect the results of the molecular weight determination as this would lead to a higher value for the molecular weight than the true value. The useful relationship is M= (gRT)/(PV). Significant intermolecular attraction exists at temperatures not far above boiling point. Therefore, the compressibility of the gas is greater and the value of the PV is smaller than predicted.

The molecular weight (MW) is the total atomic weight of a molecule. The MW is determined by summing the mass of all the individual atoms in a molecule.

If a substance is a volatile liquid, a common method to determine its molar mass is to use the ideal gas law, PV= nRT. Because the liquid is volatile, it can easily be converted to a gas. While the substance is in the gas phase, you can measure its volume, pressure, and temperature.

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Answer:

Nervous system, Cardiac system, and the muscluar system

Explanation:

Answer:

shorten reaction time

...........

Answer:

4092 atoms of iron i am guessing

Explanation:

To find the molar mass, what we do is to follow the steps:

1. Make use of the chemical formula to determine the number of atoms of each element in the compound.

2. Multiply the molar mass of each element with its number of atoms present in the compound.

3. Add up all and assign unit as grams/mole.

In this problem, the molecule of water contains 2 atoms of Hydrogen and 1 atom of Oxygen.

The molar mass of Hydrogen is about 1g/mol and the molar mass of Oxygen is about 16g/mol, so:

Therefore, the answer is 18 g/mol.

Answer:

Option C, developmental view point

Explanation:

A person with preservationist viewpoint will think of only preserving the natural resources and the environment. While a person with a conservationist viewpoint will think of conserving the landscape, architecture, heritage, culture, buildings, rituals, etc.  

However, a person with developmental viewpoint will think of developing resources at ease. He/She will prioritize development and comfort of customer above all.  

Hence, option C is correct

A gas under constant pressure will expand when heated.

The temperature is the degree of hotness or coldness of the object.

According to the ideal gas law.

pV= nRT

where, p = pressure. V = volume, n =moles of elements, R =universal gas constant and T =temperature.

When pressure is kept constant, volume is directly proportional to the temperature.

When temperature is increased or an object is heated, the volume also increases i.e expands.

Thus, a gas under constant pressure will expand when heated.

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Answer:

This substance is basic.

Explanation:

The milk of Magnesia, a type of medication which can help people with heartburn and with a pH of 10.5 is a basic solution.

Answer:

C6H15

Explanation:

First, we calculate the empirical formula as follows:

C = 41.33 g

H = 8.67 g

We convert each mass value to mole by dividing each element by its molar mass (C = 12g/mol, H = 1g/mol)

C = 41.33g ÷ 12g/mol = 3.44mol

H = 8.67g ÷ 1g/mol = 8.67mol

Next, we divide each mole value by the smallest (3.44mol)

C = 3.44mol ÷ 3.44mol = 1

H = 8.67mol ÷ 3.44mol = 2.52

We multiply this ratio by 2 to get a simple whole number ratio

C = 1 × 2 = 2

H = 2.52 × 2 = 5.04

Based on this, the whole number ratio of C and H is 2:5, hence, the empirical formula is C2H5.

The molecular mass of the compound is given as 87.18 g/mol, hence, the molecular formula is calculated as follows:

(C2H5)n = 87.18

[12(2) + 1(5)]n = 87.18

[24 + 5]n = 87.18

(29)n = 87.18

n = 87.18 ÷ 29

n = 3.006

Approximately to whole number, n = 3

Hence, the molecular formula of the compound is [C2H5]3

= C6H15

Some of the properties of carbon that make it possible for millions of carbon compounds to occur naturally include:

Carbon compounds are compounds that are composed mainly of carbon bonded to other elements.

Carbon compounds may be organic or inorganic in nature.

Carbon due to some of its unique properties is responsible for the existence of many compounds in living organisms known as organic compounds.

Some of the unique properties of carbon include:

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The total number of molecules contained in 0.5 mole of O₂ is 3.0×10²³ molecules

From Avogadro's hypothesis,

1 mole of O₂ = 6.02×10²³ molecules

With the above information in mind, we can obtain the number of molecules in 0.5 mole of O₂ as illustrated below:

1 mole of O₂ = 6.02×10²³ molecules

Therefore,

0.5 mole of O₂ = 0.5 × 6.02×10²³

0.5 mole of O₂ ≈ 3.0×10²³ molecules

Thus, 3.0×10²³ molecules is present in 0.5 mole of O₂.

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