Can the crabs see the plankton they eat near the ocean floor?

Answer:

11x³ – 2x² + 3x + 11

Explanation:

From the question given above:

We are to find the sum of:

4x³ + 2x² – 4x + 3 and 7x³ – 4x² + 7x + 8

To add the above polynomials together we must recognise that we can only add like terms together. The sum of the above polynomials can be obtained as follow:

. 4x³ + 2x² – 4x + 3

+ 7x³ – 4x² + 7x + 8

¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯

= 11x³ – 2x² + 3x + 11

Thus, the sum of 4x³ + 2x² – 4x + 3 and 7x³ – 4x² + 7x + 8 is 11x³ – 2x² + 3x + 11

Answer:

40

Explanation:

120 - 80 = 40

The reaction order and specific reaction rate constant can be determined by performing the kinetics experiment on irreversible polymerization A. Kinetic experiments can be used to investigate the rate and mechanism of chemical reactions. Chemical kinetics is the study of chemical reactions' speed and pathway.

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Answer:

D. pollution

Explanation:

Increase in ocean temperature is one of the major consequence of global warming which directly leads to rise in sea level,  coral bleaching and ocean deoxygenation.

Warming ocean temperatures do not leads to pollution directly whereas pollution leads to warming ocean temperatures. So, in the case of pollution, the effect is opposite.

Hence, the correct option is D.

Answer:

Answer:

Protection : Surface corrosion forms an oxide layer which further protects the inner metal form corrosion

.

Corrosion prevents corrosion : Some metals like zinc are used as sacrificial anodes to prevent corrosion to other metal.

Galvanic corrosion : The principle on which primary batteries work.

Li₃PO₄ + 3 Zn(NO₃)₂ → 3 LiNO₃ + Zn₃(PO₄)₂. In this balanced equation, one of the products is Zn₃(PO₄)₂. To ensure that the equation is balanced, we need 3 moles of Zn(NO₃)₂ for every 1 mole of Li₃PO₄.

In a chemical reaction, a product is a substance that is formed as a result of the chemical reaction. It is the end result of a chemical reaction, and it is produced by the rearrangement of atoms and/or ions of the reactants.

In the given equation, we end up with 1 mole of Zn₃(PO₄)₂ for every 3 moles of Zn₃(PO₄)₂. This means that the molar ratio of Zn₃(PO₄)₂ to Zn₃(PO₄)₂ is 1:3, indicating that we need three times as much Zn₃(PO₄)₂ as Zn₃(PO₄)₂ to balance the equation. Therefore, one of the products, Zn₃(PO₄)₂, must be produced in a smaller quantity than the other product, LiNO₃.

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Answer:   3 mol oxygen.

Explanation:       Because by definition you have 1 mol of potassium nitrate. Potassium nitrate in this quantity comprises 1 mol K, 1 mol N,

Period 2 element would the 4th ionization energy be much larger than the 3rd ionization energy is Boron.

Boron belongs to period second. atomic no. of boron is 5 and the electronic configuration is given as :

B₅  =   1s² 2s² 3p₁

The 1st ionization energy = 800.6

the 2nd ionization energy = 2427.1

the 3rd ionization energy = 3659.7

the 4th ionization energy = 25025.8

So. we can see that the 3rd ionization energy is much lower than 4th ionization energy because after removing the 3rd electron from 2s boron will attain the stable electronic configuration of helium. now to remove electron from filled orbital it will require much larger energy the 3rd ionization energy.

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Answer:

In Thomas Cole's painting "The Oxbow," Thomas Cole, the artist, shows himself sitting in the landscape while painting it.

Explanation:

In the painting called "The Oxbow" by Thomas Cole, the artist actually put himself in the picture. He's sitting right in the middle of the landscape, just like he placed himself in the painting, as if taking a selfie while working on it. It's like he took a snapshot of himself while he was working on the painting. This shows how much he cared about creating the artwork and how he felt a personal connection to the beautiful scenery. It's really fascinating because it gives us a glimpse into how he saw himself as an artist and how he wanted to capture the incredible beauty of nature through his art.

As per the given data, 1.6 grams of oxygen reacted in this experiment.

To calculate the amount of oxygen that reacted in the experiment, we need to determine the difference in the mass of X oxide (X,O) formed and the mass of X initially used.

Given:

Mass of X = 4.6 g

Mass of X oxide (X,O) = 6.2 g

To find the amount of oxygen that reacted:

Mass of oxygen = Mass of X oxide - Mass of X

= 6.2 g - 4.6 g

= 1.6 g

Therefore, 1.6 grams of oxygen reacted in this experiment.

Calculate the mass of 1 mole of X:

Given that the mass of X is 4.6 g, we can calculate the molar mass of X by dividing the mass by the number of moles:

Molar mass of X = Mass of X / Number of moles of X

Molar mass of X = 4.6 g / 0.1 mol

Molar mass of X = 46 g/mol

Therefore, the mass of 1 mole of X is 46 grams.

Thus, the answer is 46 grams.

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Tying marshmallows utilising toothpicks together was difficult about building the model

Building the construct was challenging because of the toothpicks used to connect the marshmallows.

• The Salt Model consists of three layers that can be stacked on top of one another to form a NaCl unit cell.

Using the model in two different orientations is possible if the layers are connected.

• As shown by the salt model, the majority of basic inorganic compounds are composed of ions that interchange endlessly rather than discrete molecules.

Little marshmallows could serve as an analogy for the tiny sodium atoms.

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Answer:

(c). You will have an excess of gas and the reaction will occur.

Explanation:

We can use the ideal gas law to calculate the number of moles of gas in each case. The ideal gas law is:

PV = nRT

where:

At STP, the pressure is 1 atm (101.325 kPa) and the temperature is 273.15 K. So, the number of moles of gas at STP is:

\(n =\frac{ PV }{ RT} =\frac{ (101.325 kPa)(22.4 L) }{(8.31 L-kPa/mol-K)(273K)} = 1mol\)

At 100 kPa and 373 K, the number of moles of gas is:

\(n =\frac{ PV }{ RT} =\frac{ (100 kPa)(45 L) }{(8.31 L-kPa/mol-K)(373 K)} = 1.45mol\)

So, you have 1.45 moles of gas at 100 kPa and 373 K. The reaction requires 1 mole of gas at STP, so you have an excess of 0.45 moles of gas. The excess gas will not participate in the reaction, but it will not prevent the reaction from occurring.

Therefore, the correct answer is (c). You will have an excess of gas and the reaction will occur.

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To complete Sally's paragraph of the carbon cycle, the correct words to fill in the blanks are:

Close to the volcano, the carbon dioxide levels could increase. This could be good for plants, because they require carbon dioxide to grow. Over thousands of years when these organisms decay, they could form more limestone. This part of the carbon cycle is an example of how carbon from the atmosphere is used by organisms that eventually become part of the lithosphere.

The carbon cycle is a biogeochemical cycle that describes the movement of carbon through the biosphere, geosphere, hydrosphere, and atmosphere. The carbon cycle is one of the most important cycles on Earth, as it is essential for life.

In the paragraph, Sally is describing how the carbon cycle can be affected by volcanoes. When a volcano erupts, it releases carbon dioxide into the atmosphere. This can increase the carbon dioxide levels in the atmosphere, which can be good for plants. Plants use carbon dioxide to photosynthesize, which is the process by which they convert sunlight into energy.

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An equation which obey the law of conservation of mass is defined as the balanced chemical equation. According to law of conservation of mass, mass can neither be created nor be destroyed. The products are LiNO₃ and K. The correct options are B and D.

The substance which appears on the left hand side of the equation is defined as the reactants whereas the substance which are present on the right hand side are called products.

The reaction between 'Li' and KNO₃ is given as:

Li (s) + KNO₃ (aq) → LiNO₃ + K

Thus the correct options are B and D.

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Answer:

\(\huge\boxed{5 \ m/s}\)

Explanation:

Given:

Distance = S = 50 m

Time = t = 10 secs

Unknown:

Speed = v = ?

Formula:

v = S/t

Plug In:

S = 50 m , t = 10 secs

Solution:

v = 50 m / 10 secs

v = 5 m/s

Hope this helped!

Answer:

How do amoeba respire.

Define Diffusion.

Answer: Mendeleev predicted elements that would later be discovered.

Answer:

The d-block and transition metal are not interchangeable terms because the d-block elements are a subset of the transition metal elements. The transition metals are defined as the elements that have partially filled d orbitals, which includes the d-block elements as well as other elements that have partially filled d orbitals in other blocks, such as lanthanides and actinides. Therefore, while all d-block elements are transition metals, not all transition metals are d-block elements.

Answer:

5.67x10²³ ions

Explanation:

By looking at the molecular formula, we can tell that there are three Sr²⁺ ions per Sr₃(PO₄)₂ molecule.

We convert Sr₃(PO₄)₂ moles into Sr₃(PO₄)₂ molecules by using Avogadro's number:

Finally we multiply that number by 3 in order to convert Sr₃(PO₄)₂ molecules to Sr²⁺ ions:

The temperature of the gas in Kelvin, after its volume is reduced to 2,450 mL, is approximately 143.27 K.

To determine the temperature of the gas in Kelvin after its volume is reduced, we can use the combined gas law, which relates the initial and final conditions of pressure, volume, and temperature for a given amount of gas.

The combined gas law equation is:

(P₁ * V₁) / T₁ = (P₂ * V₂) / T₂

Where P₁ and P₂ are the initial and final pressures, V₁ and V₂ are the initial and final volumes, T₁ is the initial temperature in Kelvin, and T₂ is the final temperature in Kelvin.

Given that the initial volume V₁ is 3,480 mL, the initial temperature T₁ is -70.0 °C (which needs to be converted to Kelvin), and the final volume V₂ is 2,450 mL, we can substitute these values into the equation.

To convert -70.0 °C to Kelvin, we add 273.15 to it, resulting in T₁ = 203.15 K.

Now we can solve for T₂:

(T₂ * V₁) / T₁ = V₂

T₂ = (V₂ * T₁) / V₁ = (2,450 mL * 203.15 K) / 3,480 mL

Simplifying the equation, we find:

T₂ ≈ 143.27 K

Therefore, the temperature of the gas in Kelvin, after its volume is reduced to 2,450 mL, is approximately 143.27 K.

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Answer:

pkw= pH + pOH.

Explanation:

As. [H3O+]  equals [OH-] then pH  must equal pOH because  they are just negative logs of the  respective concentration, which are equal.

There are approximately 2.8939 x\(10^2^4\) carbon atoms in 0.37 mol of procaine.  The molecular formula of procaine (C₁₃H₂₀N₂₀₂), one can see that there are 13 carbon atoms (C13) in one molecule of procaine.

Avogadro's number (6.022 x \(10^2^3\)) represents the number of particles (atoms, molecules, or formula units) in one mole of a substance

The number of molecules of procaine in 0.37 mol:

Number of molecules = 0.37 mol x (6.022 x\(10^2^3\) molecules/mol)

Number of carbon atoms = Number of molecules x 13 carbon atoms/molecule

Number of molecules = 0.37 mol x (6.022 x \(10^2^3\)molecules/mol)

= 2.22614 x \(10^2^3\)molecules

Number of carbon atoms = 2.22614 x \(10^2^3\) molecules x 13 carbon atoms/molecule

= 2.8939 x \(10^2^4\)carbon atoms

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The molar extinction coefficient is specific to the substance being measured and the wavelength of light used. Accurate and precise values for absorbance, concentration, and path length are necessary for an accurate calculation.

To calculate the molar extinction coefficient (ε) using wavelength (λ) and absorbance (A):

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Answer:

B. Chlorine gas is yellow-green in color.

Answer:

Br-CH2-CH(CH3)2-C(Cl)H-CH(CH3)2-CHO

Explanation:

The molecule has a total of 14 carbon atoms, 13 hydrogen atoms, and 1 bromine atom. The carbon atoms are arranged in a chain with a methyl group attached to the second carbon atom, a chlorine atom attached to the third carbon atom, and two methyl groups attached to the fourth carbon atom. The fifth carbon atom has a carbonyl group attached to it.

The molecule is an aldehyde, which means that it has a carbonyl group (C=O) at the end of the chain. The carbonyl group is polar, and the oxygen atom has a partial negative charge. The hydrogen atom has a partial positive charge. This polarity makes the aldehyde group susceptible to nucleophilic attack.

The bromine and chlorine atoms are both electrophilic, which means that they have a partial positive charge. This makes them susceptible to nucleophilic attack.

The methyl groups are non-polar and do not have any significant reactivity.

The molecule is a chiral molecule, which means that it has a mirror image that is not superimposable on itself. This is because the carbon atom with the carbonyl group is attached to four different groups.

The molecule is a liquid at room temperature and has a strong odor. It is used in a variety of products, including perfumes, flavorings, and plastics.

1. Using your knowledge of the Brønsted-Lowry theory of acids and bases, complete the following acid-base reactions and indicate each conjugate acid-base pair.

i. OH + HPO₂ → H₂O + H₂PO₄²⁻

The conjugate acid-base pair is OH/H₂O, HPO₂²⁻/H₂PO₄²⁻

2) Identify the conjugate acid-base pairs in the following reactions. Write A, B, CA, and CB below the appropriate substance.

i. HCO₃⁻ + NH₃ → NH₄⁺ + CO₃²⁻

The conjugate acid-base pair is HCO₃⁻/CO₃²⁻, NH₃/NH₄⁺

ii. HCI + H₂O → H₃O⁺ + Cl⁻

The conjugate acid-base pair is H₂O/OH⁻, HCI/Cl⁻, H₃O⁺/H₂O, Cl⁻/HCI

iii. CH₃COOH + H₂O → H₃O⁺ + CH₃COO⁻

The conjugate acid-base pair is CH₃COOH/CH₃COO⁻, H₂O/OH⁻, H₃O⁺/H₂O

iv. HOCI + NH₃ → NH₄⁺ + ClO⁻

The conjugate acid-base pair is HOCI/ClO⁻, NH₃/NH₄⁺

3. Write the formula for conjugate bases formed by the following acids.

i. HPO₄²⁻ → PO₄³⁻

ii. H₂O → OH⁻

iii. CN⁻ → HCN

iv. HOOC-COO⁻ → HOOCCOOH

4) Write the formula for conjugate acids formed by each of the following bases.

i. H₃O⁺ → H₂O

ii. HCN → H₂CN⁺

iii. NH₃ → NH₄⁺

5. Classify each of the following pH values as acidic, basic, or neutral.

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Answer:

C. 2s

Explanation:

the "s" orbital is only possible at an energy level of n = 1. 2s means the energy level is at n = 2 and that's not possible for the "s" sublevel.

The formula of the ionic compound is XeAr_2.

An ionic compound is a chemical compound composed of positively and negatively charged ions held together by electrostatic forces. These ions are held together in a lattice structure, forming an ionic bond. Examples of ionic compounds include table salt (NaCl), magnesium oxide (MgO), and calcium chloride (CaCl2).

The cation, Xe, has 8 electrons in its outermost shell, while the anion, Ar, has 8 electrons in its outermost shell. This means that the shared electrons between Xe and Ar will be 8, resulting in a 2:2 ratio, or XeAr_2. Therefore, the formula of the ionic compound is XeAr_2.

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