how many valence electrons does the cyanide ion (cn−) have? how many bonds are present in its lewis structure?

Answer:

Ionic compounds conduct electricity when molten (liquid) or in aqueous solution (dissolved in water), because their ions are free to move from place to place. Ionic compounds cannot conduct electricity when solid, as their ions are held in fixed positions and cannot move.

Explanation:

Your food web should include drawings and labels of the organisms as well as arrows to show how energy (food) moves through the web

In the food web in a feed food chain, energy and nutrients go from plants to the fruitarian consuming them, and to the carnivores or omnivores hunt upon the herbivores. owls often eat other carnivores, such as weasels, bats, and astute, and insect-eating birds. Therefore, owls hold a spot at the top of the food chain. Using the food web and simple determining, they track the flow of energy and biomass through the food web, and impose the concept of matter and energy ... food web uses the real-life diet of an owl. Many times in science classes you may vivisect an owl's amount of available energy decrease as it passes through the ecosystem.

So we can conclude that the food web consists of all the food chains in one ecosystem. Each living thing in an ecosystem is part of a different food chain.

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Answer:

Explanation:

The number of atoms of potassium can be found by using the formula

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

N = 1.65 × 6.02 × 10²³

We have the final answer as

Hope this helps you

Answer:

Abiotic factors.

Explanation:

The elements do all the “s” orbital span (go across) in each period is 2. Thus option a is correct.

Elements are defined as  a pure substance made up of only one sort of atom with the same number of protons in its nucleus.

It can also be defined as the a substance that can't be broken down into anything else.

Sublevels are defined as a quantum theory-defined energy level Sublevels are energies associated with electrons in chemistry.

There are mainly four sublevels

Thus, the elements do all the “s” orbital span (go across) in each period is 2. Thus option a is correct.

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Blocking calcium influx into the axon terminal can have several effects on neuronal communication and neurotransmitter release.

Calcium influx into the axon terminal is a key step in the process of neurotransmitter release. When an action potential reaches the axon terminal, it triggers the opening of voltage-gated calcium channels, allowing calcium ions to flow into the terminal. The increase in intracellular calcium concentration triggers the fusion of synaptic vesicles containing neurotransmitters with the presynaptic membrane, and the subsequent release of the neurotransmitters into the synaptic cleft.

If calcium influx into the axon terminal is blocked, neurotransmitter release is inhibited or reduced. This can lead to a variety of effects, depending on the specific neurotransmitter and the location of the synapse. For example:

- Inhibition of excitatory neurotransmitter release could reduce synaptic transmission and decrease neuronal activity.
- Inhibition of inhibitory neurotransmitter release could increase synaptic transmission and increase neuronal activity.
- Inhibition of neurotransmitter release at neuromuscular junctions could lead to muscle weakness or paralysis.

Calcium channel blockers are a class of drugs that can be used to block calcium influx into axon terminals and reduce neurotransmitter release. These drugs are used to treat a variety of conditions, including high blood pressure, angina, and arrhythmias.

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A catalyst used in a reaction remains unchanged

Answer:

It's the elements atomic mass and the number of neutrons and protons in an atom.

Explanation:

The smaller value of x is the limiting factor, so we can conclude that 6.02 moles of H₃PO₄can form during the reaction.

From the given information, we know that 2.0 mol P₄O₁₀ can form 8.0 mol H₃PO₄. Therefore, if we have x moles of H₃PO₄, we would need 0.25x moles of P₄O₁₀.

We also know that 8.0 mol H2O can form 5.3 mol H₃PO₄. Therefore, if we have x moles of H₃PO₄, we would need (8/5.3)x moles of H₂O

Since we need to use the limiting reactant to determine the amount of product formed, we can set up an inequality:

0.25x ≤ 2.0 (the amount of P₄O₁₀ available)

(8/5.3)x ≤ 8.0 (the amount of H₂O available)

Solving for x in both cases, we get:

x ≤ 8.0 (from the P₄O₁₀ reaction)

x ≤ 6.02 (from the H₂O reaction)

The smaller value of x is the limiting factor, so we can conclude that 6.02 moles of H₃PO₄ can form during the reaction.

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The force that causes a fishing line to snaps due to the inability to hold the weight of a fish is called the Tension Force

A tension force is a force that acts upon a surface, material and a line. It acts on a line as a result of a force that causes the line to stretch.

Tension acts on the two ends of a line, it can be said to be an action and reaction force.

Tension acting on a fishing line comes from the fisherman and the fish to be caught. The tension meets at the middle of the line and when the line is not strong enough to hold such amount of force it snaps.

In conclusion, The force that causes a fishing line to snaps due to the inability to hold the weight of a fish is called the Tension Force

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According to the postulates of kinetic molecular theory, the particles of a liquid are close together and are in constant random motion.

The Kinetic theory of matter states that all forms of matter are made up of tiny particles which possess kinetic energy and are in constant state of motion.

The strength of the forces keeping the particles together determines the state in which that substance exists in.

For liquids, the intermolecular forces of attraction between between the molecules are not very strong, and as such, the particles of a liquid are in constant state of random motion.

Therefore, according to the postulates of kinetic molecular theory, the particles of a liquid are close together and are in constant random motion.

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The stroke volume in the next few cardiac cycles will be 100 ml if the end-diastolic volume is increased from 135ml to 165m.

The formula for stroke volume is given as;

SV = EDV - ESV

Here SV represents stroke volume, EDV represents end-diastolic volume and ESV represents end-systolic volume.

First, we calculate this person's end-systolic volume as follows;

If the person’s stroke volume was 70ml and his initial diastolic volume was 135 ml, then:

70 = 135 - ESV

70 - 135 = -ESV

-65 = -ESV

ESV = 65ml

Now the stroke volume in the next few cycles if the end-diastolic volume increase to 165 ml can be calculated as follows;

SV = 165 - 65

SV = 100ml

Therefore, the stroke volume in the next few cardiac cycles is calculated to be 100ml.

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Answer:

William Crookes????????????????

Answer:

-368.62 kJ/mol

Explanation:

[(2 x - 470.11 kJ/mol) ( 0kJ/mol)] - [ 2 x -285.8 kJ/mol) (2x 0 kj/mol)] = -368.62 kJ/mol

there are 12 atoms of mg in the following equations

Answer:

\(\boxed {\boxed {\sf 12 \ Mg \ atoms }}\)

Explanation:

We are given this formula:

\((Mg_3N_2)_4\)

We want to find the number of magnesium atoms. We can see that there is a subscript of 3 after the magnesium, so there are 3 magnesium atoms in 1 molecule of the compound.

However, there is a subscript of 4 that comes after the entire compound, so there are actually 4 molecules, with each molecule containing 3 magnesium atoms. Multiply 4 and 3.

There are 12 magnesium atoms.

First convert Temperatures to Kelvin scale

Now

USING GAY LUSSAC's Law

\(\\ \sf\longmapsto P_1T_2=P_2T_1\)

\(\\ \sf\longmapsto P_2=\dfrac{P_1T_2}{T_1}\)

\(\\ \sf\longmapsto P_2=\dfrac{2.5(298)}{25}\)

\(\\ \sf\longmapsto P_2=\dfrac{795}{25}\)

\(\\ \sf\longmapsto P_2=31.8atm\)

Answer:

\( \huge{ \boxed{201.0 \: g}}\)

Explanation:

The mass of \( NH_4Cl \) required to make the solution can be found by using the formula;

\( c = \dfrac{m}{M \times v} \)

c is the concentration in M , mol/dm³ or mol/L

v is the volume in L or dm³

M is the molar mass in g/mol

m is the mass in grams

Making m the subject;

\(m = 1.5 \times 53.5 \times 2.5 \\ = 200.625 \approx201.0\)

We have the final answer as

Answer:

The number of protons in the nucleus of an atom is its atomic number, which is unique to each element.

Explanation:

Answer:

It's the same as the atomic number e.g. Oxygen has the atomic number 8 so it has 8 protons in the nucleus.  

The mass of ice that melts is the same as the total amount of ice and that is 300 g

The mass of melted ice equals the mass of newly produced water. The law of conservation of mass states that throughout a physical or chemical change, mass is neither created nor destroyed.

Ice melts when it undergoes a phase transition, turning from solid ice to liquid water. Throughout the process, the mass of the ice remains constant and is equal to the mass of the liquid water that is produced.

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The saltwater of the ocean creates the marine ecosystem. Freshwater bodies of water, such as lakes, ponds, streams, and rivers, make up the freshwater ecosystem.

What are ecosystems?

All the organisms and the physical setting they interact with make up an ecosystem. The nutrition cycles and energy flows connect these biotic and abiotic elements.

The marine biome, which makes up around 70% of the planet's surface, is the largest biome. On Earth, freshwater biomes make up about 20% of the land. The salt content distinguishes the two. They both have several aquatic animal species.

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Answer:

The main way animal-like protists differ from plant-like protists is in the way they get energy. Animal-like protists are heterotrophs. They have to eat other protists or bacteria in order to get energy, much as animals have to eat plants or other animals to get their energy. Plant-like protists, on the other hand, are autotrophs. They can make their own energy from the sun or other sources just as plants can.

Explanation:

hope that helps ☺️

Explanation:

Animal-like protists are heterotrophs. Plant-like protists, on the other hand, are autotrophs.

Answer:

See Below

Explanation:

'an aerobic ' means it does not use oxygen

Answer:

anaerobic

Explanation:

Answer:2

Explanation:

The number of valence electrons for a helium atom is 2. This can be confirmed by looking at the electronic configuration.

Helium is placed in the noble gas series as it has certain properties of it. The atomic number of helium is 2. Thus, it has two electrons in its outermost shell but it has completely filled orbital.

Electronic configuration of He = 1s2

Thus, for drawing the electron dot structure, there are two valence electrons.

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Answer:

100mL of chloromethane

Explanation:

Based on the equation:

Cl₂(g) + CH₄(g) → HCl(g) + CH₃Cl(g)

1 mole of chlorine reacts per mole of methane to produce 1 mole of HCl and 1 mole of chloromethane

Avogadro's law says that equal volumes of all gases, at the same temperature and pressure, have the same number of molecules. Using Avogadro's law we can say of the equation that:

1 mL of chlorine reacts per mL of methane to produce 1 mL of HCl and 1 mL of chloromethane

Because the system stays under constant pressure and temperature.

As 100mL of Cl₂ reacts with excess of CH₄ and 1mL of Cl₂ produce 1mL of CH₃Cl there are produced:

Williamson ether synthesis would give a poor yield of product as the halide is on a 2° carbon. is true about the synthesis of 1-isopropoxy-1-methylcyclopentane.

The Williamson ether synthesis is a method for the synthesis of ethers using an alcohol and an alkyl halide. The reaction proceeds through a nucleophilic substitution mechanism and the ether product is obtained with the alcohol and halide groups in the anti-Markovnikov orientation. The reactivity of the alkyl halides used in this reaction follows the order: primary > secondary >> tertiary. Therefore, the reaction of a secondary halide such as 2° carbon halide will give a poor yield of product as the reactivity of 2° carbon halide is less compared to primary halide. As a result, the reaction is less efficient and the yield of the product is lower.

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Answer:

Help your self

Explanation:

The weight of silver sulfide that can be made from 1.23 mg of hydrogen sulfide (H2S) obtained from a rotten egg is 8.94mg.

Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions.

According to this question, silver reacts with hydrogen sulphide and oxygen to form silver sulphide and water as follows:

4Ag(s) + 2H₂S(g) + O₂(g) → 2Ag₂S(s) + 2H₂O(l)

Based on the above equation, 2 moles of hydrogen sulphide forms 2 moles of silver sulphide.

moles of hydrogen sulphide = 0.00123 gram ÷ 34.1 g/mol

moles = 3.607 × 10-⁵moles of H₂S, which is equivalent to 3.607 × 10-⁵moles of Ag₂S.

mass of Ag₂S = 247.8 g/mol × 3.607 × 10-⁵moles = 0.008938grams

Mass of silver sulphide = 8.94mg

Therefore, 8.94milligrams is the weight of silver sulphide.

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Answer:

B

Explanation: