each example of rock weathering can be categorized as either physical weathering or chemical weathering. drag each item to the correct location.

Answer:

I don't know because I don't know about chemistry

The moles of carbon dioxide gas that are present in the sample is 1.36 mol. The ideal gas law should be applied to calculate the number of moles of CO₂.

According to ideal gas laws, the number of moles can be found by using the formula:

                    PV = nRT

Where P = Pressure of the gas = 1.30 atm (given)

            V = Volume of gas = 31  L

            T = Temperature = 87 °C = 360 K

            R = Gas constant = 0.0821 L atm mol⁻¹ K⁻¹

            n = number of moles

                           \(n = \frac{PV}{RT} \\\\n = \frac{(1.3) (31.0)}{(0.0821) (360)} \\\\n = 1.36\)

Hence, the moles of CO₂  gas in the sample = 1.36 mol

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The birth weight of cats at the 90th percentile would be approximately 3.7 ounces. b. The birth weight of cats at the 10th percentile would be approximately 2.3 ounces.

There are three main methods of calculating weight:

1. Balance Beam Scale: A balance beam scale is an example of a mechanical weighing system. It uses a set of calibrated weights to measure the weight of an object.

2. Digital Scale: A digital scale uses an electronic or digital readout to display the weight of an object.

3. Calipers: Calipers are devices used to measure the distance between two points, such as thickness or diameter. They come in various sizes and shapes, depending on the type of measurement the user wants to take.

Birth weight is the weight of a baby at the time of birth. It is usually measured soon after delivery, with a special baby scale, though sometimes the baby's weight is estimated. The normal range of birth weight is anywhere between 5 lbs 8 oz and 10 lbs, though preterm or premature babies may be significantly lighter. A baby's birth weight is important because it can provide a clue to the baby's overall health. High birth weights may indicate an underlying medical condition, and low birth weights can be a sign of premature or difficult delivery and health risks associated with such a delivery.

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Considering the phase diagram, the state of matter that exists in area B is gas.

The correct option is A.

A phase diagram is a graphical representation that shows the conditions of temperature and pressure at which different phases or states of a substance exist.

The axes of a phase diagram typically represent temperature (usually on the horizontal axis) and pressure (usually on the vertical axis). The diagram is divided into regions that correspond to different phases, and the lines separating these regions represent phase boundaries.

The point where three phase boundaries meet is known as the triple point, which represents the temperature and pressure at which all three phases can coexist in equilibrium.

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Density is calculated using the following equation:

where m is the mass and v is the volume.

p = 299.8 g/74.2mL

p = 4.040431267 g/mL

The number of significant figures in this amount of density is 10 if you do not round off.

.

Step 1 - Understanding what happens during a chemical reaction

During a chemical reaction, substances are transformed. The susbtances already present before the reaction are called reactants, whereas the susbtances formed by the reaction are called products:

A chemical reaction is a little bit like Lego playing: no new atom is created nor destroyed, they are just rearranged. This rearrangement is possible because the reactants' chemical bonds are broken, and new bonds are formed.

Step 2 - Finding the correct alternative

As we have seen in step 1, no new atoms are formed. The atoms are the same, they are just joined together in a different way.

Therefore, item a) is not correct.

To calculate the pH of the solution obtained by mixing HCl and NaOH, we need to consider the neutralization reaction between the two compounds. The reaction between HCl (hydrochloric acid) and NaOH (sodium hydroxide) produces water (H₂O) and forms a salt (NaCl).

Given:

Volume of HCl solution (V₁) = 40 cm³

Concentration of HCl solution (C₁) = 0.2 M

Volume of NaOH solution (V₂) = 30 cm³

Concentration of NaOH solution (C₂) = 0.1 M

1. Determine the moles of HCl and NaOH used:

Moles of HCl = Concentration (C₁) × Volume (V₁)

Moles of HCl = 0.2 M × 0.04 L (converting cm³ to L)

Moles of HCl = 0.008 mol

Moles of NaOH = Concentration (C₂) × Volume (V₂)

Moles of NaOH = 0.1 M × 0.03 L (converting cm³ to L)

Moles of NaOH = 0.003 mol

2. Determine the limiting reagent:

The stoichiometry of the reaction between HCl and NaOH is 1:1, meaning that they react in a 1:1 ratio. Whichever reactant is present in a smaller amount will be the limiting reagent.

In this case, NaOH is present in a smaller amount (0.003 mol), which means it will be fully consumed during the reaction.

3. Determine the excess reagent and its remaining moles:

Since NaOH is the limiting reagent, we need to find the remaining moles of HCl.

Moles of HCl remaining = Moles of HCl initially - Moles of NaOH reacted

Moles of HCl remaining = 0.008 mol - 0.003 mol

Moles of HCl remaining = 0.005 mol

4. Calculate the concentration of HCl in the resulting solution:

Volume of resulting solution = Volume of HCl solution + Volume of NaOH solution

Volume of resulting solution = 0.04 L + 0.03 L

Volume of resulting solution = 0.07 L

Concentration of HCl in the resulting solution = Moles of HCl remaining / Volume of resulting solution

Concentration of HCl in the resulting solution = 0.005 mol / 0.07 L

Concentration of HCl in the resulting solution ≈ 0.071 M

5. Calculate the pH of the resulting solution:

pH = -log[H⁺]

pH = -log(0.071)

Using logarithm properties, we can determine the pH value:

pH ≈ -log(0.071)

pH ≈ -(-1.147)

pH ≈ 1.147

Therefore, the pH of the solution obtained by mixing 40 cm³ of 0.2 M HCl and 30 cm³ of 0.1 M NaOH is approximately 1.147.

Answer:

Explanation:

The balanced chemical equation for the reaction between magnesium carbonate and hydrochloric acid is:

MgCO3 + 2HCl → MgCl2 + H2O + CO2

From the equation, we can see that 1 mole of magnesium carbonate reacts with 2 moles of hydrochloric acid to produce 1 mole of carbon dioxide. The molar mass of magnesium carbonate is 84.3 g/mol, which means that 21 g of magnesium carbonate is equal to 0.25 moles (21/84.3). Therefore, 0.25 moles of magnesium carbonate will react with 0.5 moles of hydrochloric acid to produce 0.25 moles of carbon dioxide.

The volume of carbon dioxide can be calculated using the ideal gas law, which is PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature. Assuming standard temperature and pressure (STP) of 273 K and 1 atm, we can use the molar volume of a gas at STP, which is 22.4 L/mol, to calculate the volume of carbon dioxide produced.

V = n × 22.4 L/mol

V = 0.25 mol × 22.4 L/mol

V = 5.6 L

Therefore, the volume of carbon dioxide produced when 21 g of magnesium carbonate reacts completely with excess hydrochloric acid is 5.6 L. The answer is option A, 4 dm³, which is approximately equal to 5.6 L.

Floral preservatives are chemical solutions used to extend the longevity of cut flowers after they have been harvested.

These solutions contain a mixture of substances designed to optimize the growth and development of flowers while inhibiting the growth and activity of harmful bacteria, fungi, and other microorganisms.

Typically, floral preservatives contain three primary components: a source of carbohydrates (like sugar) to feed the flower, an acidifying agent (like citric acid) to lower the pH and prevent growth of bacteria, and a biocide (like bleach or silver nitrate) to prevent the growth of microbial contaminants.

The carbohydrates in the preservative solution provide energy and nutrients to the flowers, allowing them to continue to develop and open up. The acidifying agent helps to lower the pH of the solution, preventing the growth of bacteria that can cause the blockage of stem tissues in the vessel. The biocide inhibits microbial growth and prevents the growth and spread of disease-causing organisms that may be present.

Floral preservatives are effective in increasing the length of time that cut flowers can remain fresh and attractive, providing benefits to florists, retailers, and consumers alike.

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Answer:

You take the mass of carbon dioxide, 56.8g, divide by its molar mass, 44.01g/mol, to produce the moles of carbon dioxide. This is multiplied by the molar ratio of butane/CO2, (2/8) = 1/4, which gives the moles of butane required to produce the carbon dioxide.

Explanation:

go to google

Answer:

1.17 M

Explanation:

Step 1: Given data

Molar concentration of Li₃PO₄: 0.390 M

Step 2: Write the reaction for the dissociation of Li₃PO₄

Lithium phosphate is a strong electrolyte that dissociates according to the following equation:

Li₃PO₄(aq) ⇒ 3 Li⁺(aq) + PO₄³⁻(aq)

Step 3: Calculate the molar concentration of lithium ions

The molar ratio of Li₃PO₄ to Li⁺ is 1:3. The molar concentration of Li⁺ is 3/1 × 0.390 M = 1.17 M.

Considering the definition of strong electrolyte, the molar concentration of Li⁺ is 1.17 M.

An electrolyte is a substance that, when dissolved in water, gives rise to the formation of ions.

Electrolytes can be weak or strong, depending on whether they are partially or fully ionized or dissociated in aqueous medium.

A strong electrolyte is any substance that, when dissolved in water, exclusively causes the formation of ions with a practically irreversible dissolution reaction. That is, it is a solute that completely dissociates into ions in solution.

Lithium phosphate is a strong electrolyte that dissociates according to the following equation:

Li₃PO₄(aq) ⇒ 3 Li⁺(aq) + PO₄³⁻(aq)

From the balanced equation, you can observed that:

1 mole of Li₃PO₄ produced 3 mole of Li⁺.

Therefore, 0.390 M Li₃PO₄ will produce = 3 × 0.390 = 1.17 M Li²⁺

In summary, the molar concentration of Li⁺ is 1.17 M.

Learn more:

Answer:

1.054 x 10²⁴ molecules

Explanation:

In order to convert moles of any given substance into a number of molecules, we need to use Avogadro's number, which states the number of molecules -or atoms, in the case of elements- present in one mol:

We now convert 1.75 moles into molecules:

Answer:

.2sb

Explanation:

according to my mind its the percentage of the question

Answer:

Milk's heavy

Explanation:

Answer:

The answer is Calcium bromide

The mass of reactant that would produce 800 Joules of heat is equal to 800 J × (1 kJ/1000 J)/(24.7 kJ/g).

In order to determine the mass of reactant that would produce 800 Joules of heat, we would set up a conversion equation as follows:

Note: 1 kJ is equal to 1000 Joules.

Conversion:

1 gram = 24.7 kJ

X gram = 800 Joules

Therefore, the mass of reactant that would produce 800 Joules of heat is given by:

Mass = Heat × (conversion factor/rate of heat)

Mass = 800 J × (1 kJ/1000 J)/(24.7 kJ/g).

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Complete Question:

A certain chemical reaction releases 24.7 kJ/g of heat for each gram of reactant consumed. How can you calculate what mass of reactant will produce 800 Joules of heat?

During the melting of ice in the mouth, the mouth loses heat and feels colder.

Melting is the process by which when a solid absorbs heat from the surroundings, it changes to liquid.

Therefore, the melting of a solid is an endothermic process.

In the system of ice melting in the mouth, the ice molecule absorbs heat energy from the mouth in order to melt.

Similarly, when the temperature of the water rose to 10.0 degrees, the water at 0.00 degrees absorbs heat from the mouth.

Therefore, the mouth loses heat and feels colder.

In conclusion, the melting of ice involves ice absorbing heat from the surroundings.

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Answer:

\(m_{MgO}=0.239gMgO\)

Explanation:

Hello,

In this case, the chemical reaction between magnesium and oxygen to yield magnesium oxide is:

\(2Mg+O_2\rightarrow 2MgO\)

In such a way, for 0.144 g of magnesium reacting with sufficient oxygen, the mass of magnesium oxide, whose molar mass is 40.3 g/mol (2:2 mole ratio) turns out:

\(m_{MgO}=0.144gMg*\frac{1molMg}{24.3gMg} *\frac{2molMgO}{2molMg}* \frac{40.3gMgO}{1molMgO} \\\\m_{MgO}=0.239gMgO\)

Best regards.

The first image shows cleavage, same as the second. The third image shows fracture

1. Image 1:

2. Image 2

Image 3:

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Answer:

Project shadow #KARMA be there

Explanation:

Answer:

Only few substances can be used as natural indicators because, some natural indicators do not have chemical properties which can change the color of substances.

Explanation:

Natural indicators are obtained from natural sources such as plants. Some of the common examples of natural indicators include red cabbage, turnip skin, cherries, beetroots and more. The natural indicators will help individuals distinguish if it is a base or an acid.

Answer:

Below

Explanation:

For Carbon:

40.002 % * 180.156   = 72.066 gm/mole C     per mole of fructose

For Hydrogen:

6.714 %  * 180.156     = 12.096  gm H

For Oxygen:

53.285% *  180.156  = 95.966 gm of O

Now use periodic table to find mole wts of each

   72.066 / 12.011   = 6    moles of C per mole of fructose   ( wt = 12.011)

   12.096/ 1.008    =  12   moles of  H                                     (wt = 1.008)

    95.966/15.999 = 6     moles of O                                      (wt = 15.999)

C6 H12 O6     is MOLECULAR formula     divide everything by 6

C H2 O     is EMPIRICAL

The value of q, w, ΔU and ΔH are +2232J, -2232J, 0, 0

Data given;

Using ideal gas equation, we can calculate the volume

PV = nRT

substituting the values

\(PV=nRT\\\\10*v = 1*8.314*10^-^5*298\\V_1= 2.48*10^-^3m^3\)

The initial volume is 2.48*10^-3 m^3

However, the volume increased by 10 times.

\(v_2= 2.48*10^-^3*10=0.0248m^3\)

The work done(w) on the gas is

\(W=-p\delta V\\W= -1*(0.0248-0.00248)\\W=-0.02232barm^3\\W=-2232J\)

NB; 1 bar m^3 = 1000J

\(\delta U= C_v\delta T\\\\\delta U = 0\)

This is an isothermal process, i.e a process that underwent no change in temperature.

\(\delta U = Q+W\\0=Q+W\\Q= -W\\Q = -(-2232)\\Q = 2232J\)

The value of Q is 2232J

The ΔH of the gas can be calculated as

\(\delta H = C_p\delta T = 0\)

Since there's no change in temperature, ΔH = 0

From the calculations above, the value of q, w, ΔU and ΔH are +2232J, -2232J, 0, 0

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Answer:

[OH⁻] = 4.3 x 10⁻¹¹M in OH⁻ ions.

Explanation:

Assuming the source of the carbonate ion is from a Group IA carbonate salt (e.g.; Na₂CO₃), then 0.115M Na₂CO₃(aq) => 2(0.115)M Na⁺(aq) + 0.115M CO₃²⁻(aq). The 0.115M CO₃²⁻ then reacts with water to give 0.115M carbonic acid; H₂CO₃(aq) in equilibrium with H⁺(aq) and HCO₃⁻(aq) as the 1st ionization step.

Analysis:

            H₂CO₃(aq)     ⇄     H⁺(aq)    +    HCO₃⁻(aq); Ka(1) = 4.3 x 10⁻⁷

C(i)          0.115M                      0                  0

ΔC              -x                        +x                  +x

C(eq)    0.115M - x                   x                    x

            ≅ 0.115M

Ka(1) = [H⁺(aq)][HCO₃⁻(aq)]/[H₂CO₃(aq)] = [(x)(x)/(0.115)]M = [x²/0.115]M

= 4.3 x 10⁻⁷  => x = [H⁺(aq)]₁ = SqrRt(4.3 x 10⁻⁷ · 0.115)M = 2.32 x 10⁻⁴M in H⁺ ions.

In general, it is assumed that all of the hydronium ion comes from the 1st ionization step as adding 10⁻¹¹ to 10⁻⁷ would be an insignificant change in H⁺ ion concentration. Therefore, using 2.32 x 10⁻⁴M in H⁺ ion  concentration, the hydroxide ion concentration is then calculated from

[H⁺][OH⁻] = Kw => [OH⁻] = (1 x 10⁻¹⁴/2.32 x 10⁻⁴)M = 4.3 x 10⁻¹¹M in OH⁻ ions.

________________________________________________________

NOTE: The 2.32 x 10⁻⁴M  value for [H⁺] is reasonable for carbonic acid solution with pH ≅ 3.5 - 4.0.

The concentration of hydroxide ion of given solution is 4.3 x 10⁻¹¹M.

We can calculate the concentration of hydroxide ions as follow:

[OH⁻][H⁺] = 10⁻¹⁴

Given chemical reaction with ICE table shown as below:

                H₂CO₃(aq)     ⇄     H⁺(aq)    +    HCO₃⁻(aq)

Initial:             0.115                      0                    0

Change:           -x                        +x                  +x

Equilibrium:  0.115-x                   +x                  +x

Given that, Ka = 4.3 x 10⁻⁷

Equilibrium constant for this reaction is written as:

Ka = [H⁺][HCO₃⁻]/[H₂CO₃]

4.3 x 10⁻⁷ = x² / 0.115

x = 2.32 x 10⁻⁴M = [H⁺]

Now we calculate the concentration of hydroxide ion as:

[OH⁻][H⁺] = 10⁻¹⁴

[OH⁻] = 10⁻¹⁴ / 2.32 x 10⁻⁴ = 4.3 x 10⁻¹¹M

Hence, value of [OH⁻] is 4.3 x 10⁻¹¹M.

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C. As part of a base pair; at the 3' end in one polynucleotide strand describes its location.

Which functional group is found at the 3 ends of a polynucleotide?

The functional group that is at the end of the 3' end of the DNA is a hydroxyl group. The numbers on the carbon atoms in the pentose sugar of the nucleotides corresponding to the 3' end and the 5' end in DNA. At the 3' end, there is a hydroxyl group, made of an oxygen and hydrogen atom.

What is a nitrogenous base in DNA?

Nitrogenous base: A molecule that contains nitrogen and has the chemical properties of a base. The nitrogenous bases in DNA are adenine (A), guanine (G), thymine (T), and cytosine (C). The nitrogenous bases in RNA are the same, with one exception: adenine (A), guanine (G), uracil (U), and cytosine (C).

Why is adenine called a base?

Adenine and guanine have a fused-ring skeletal structure derived of purine, hence they are called purine bases. The purine nitrogenous bases are characterized by their single amino group (−NH 2), at the C6 carbon in adenine and C2 in guanine.

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Answer:

C, energy cannot be created nor destroyed.

Explanation:

Answer:

The total pressure of a mixture of gases can be defined as the sum of the pressures of each individual gas: Ptotal=P1+P2+… +Pn. + P n . The partial pressure of an individual gas is equal to the total pressure multiplied by the mole fraction of that gas.

Explanation:

hope this helps have a wonderfull day!

Answer:

The relative electronegativity of the two bonded atoms determines the polarity of a bond. If the difference in electronegativities between the two atoms is less than 0.4, the bond is nonpolar covalent. ... If the difference in electronegativities between the two atoms is more than 2.0, the bond is ionic.