You are at a carnival fun house standing 3m in front of a lens with a focal length of 2.5m. What would happen to your image if the lens was concave? What would the image look like if the lens was convex?

0.9 moles of aluminum will be used when reacted with 1.35 moles of oxygen based on this chemical reaction.

In chemistry, a mole, usually spelt mol, is a common scientific measurement unit for significant amounts of very small objects like molecules, atoms, or other predetermined particles. The mole designates 6.02214076 1023 units, which is a very large number.

For the Worldwide System of Units (SI), the mole is defined as this number as of May 20, 2019, according to the General Convention on Measurements and Weights. The total amount of atoms discovered through experimentation to be present in 12 grammes of carbon-12 was originally used to define the mole.

4Al + 6O\(_2\) → 2Al\(_2\)O\(_3\)

moles of oxygen =  1.35 moles

moles of al = (4/6)×  1.35 =0.9 moles

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Answer:

this is hard

Explanation:

Hormone precursor analogs can be synthesized through electrophilic aromatic substitution reactions, and their regioselectivity can be analyzed using NMR spectroscopy.

Hormone precursor analogs can be synthesized by performing electrophilic aromatic substitution reactions, which involve replacing a hydrogen atom on an aromatic ring with an electrophilic group. The regioselectivity of the reaction determines the specific position where the substitution occurs. NMR spectroscopy can be used to analyze the regioselectivity by providing information about the chemical shifts and coupling patterns of the protons in the synthesized analog.

In electrophilic aromatic substitution reactions, a precursor molecule containing an aromatic ring is treated with an electrophile under appropriate reaction conditions. The electrophile reacts with the aromatic ring, replacing one of the hydrogen atoms and forming a new bond. The regioselectivity of the reaction depends on factors such as the nature of the electrophile and the substituents present on the aromatic ring. Different positions on the ring can be selectively substituted, leading to the synthesis of various hormone precursor analogs.

NMR spectroscopy is a powerful analytical technique that can be used to study the regioselectivity of the reaction. By analyzing the NMR spectrum of the synthesized analog, valuable information about the position of the substitution can be obtained. The chemical shifts observed in the NMR spectrum provide insights into the electronic environment of the substituted proton, allowing for the determination of the regioselectivity. Coupling patterns between neighboring protons can also reveal the connectivity of the aromatic ring and confirm the desired substitution.

In summary, hormone precursor analogs can be synthesized via electrophilic aromatic substitution reactions, and their regioselectivity can be analyzed using NMR spectroscopy. This combination of synthetic chemistry and analytical techniques enables researchers to design and study novel analogs with specific substitution patterns, contributing to the understanding and development of hormone-related compounds.

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Answer: burning paper

Explanation:

The paper burns in air to form smoke and ash. which makes it a chemical change.

Assuming 8 ml of cyclohexanol is used in this reaction,  to two decimal places and do not include the unit is 6.27.

What is cyclohexanol ?

With the chemical formula HOCH(CH2)5, cyclohexanol is an organic molecule. By swapping out one hydrogen atom for a hydroxyl group, the molecule resembles cyclohexane. This substance is a deliquescent white solid with a camphor-like smell that, in extremely pure form, melts at or just below room temperature.

What is reaction?

One or more chemicals, sometimes referred to as reactants, are transformed into one or more distinct compounds, known as products, during a chemical reaction. Chemical elements and compounds are both substances.

cyclohexanol = amount = 8.0ml

density = 0.96g/ml ( mass= d*v)

mass of cyclohexanol used = 7.68g

molar mass of cyclohexanol = 100.16 g/ ml

moles of cyclohexanol  = mass/ molar mass

= 7.68g/ 100.16g/ mol

moles = 0.07667mol or 76.67 m mol

molar mass of cyclohexane = 82.14g mol⁻¹

mole of cyclohexane should form = 76.67 m mol* 82.14g mol⁻¹

= 6.27g

Therefore, assuming 8 ml of cyclohexanol is used in this reaction,  to two decimal places and do not include the unit is 6.27.

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To draw the partial orbital picture of CH2 (singlet methylene carbene) and include p-orbital, lone pair orbital, three-dimensional geometry, and hybridization, follow these steps:

1. Draw the carbon atom at the center, with two hydrogen atoms bonded to it in a V-shape. This indicates the molecule has a bent structure.

2. For hybridization, the carbon atom is sp2 hybridized. This means that one s-orbital and two p-orbitals on the carbon atom have mixed to form three sp2 orbitals.

3. Arrange the three sp2 hybrid orbitals in a trigonal planar geometry around the carbon atom, with bond angles of approximately 120 degrees. Connect one sp2 orbital to each hydrogen atom, and one sp2 orbital will have a lone pair of electrons.

4. The remaining p-orbital on the carbon atom, which is perpendicular to the plane of the molecule, will be unhybridized and empty.

So, the partial orbital picture of CH2 (singlet methylene carbene) shows a carbon atom with a bent geometry, sp2 hybridization, and an empty p-orbital perpendicular to the plane of the molecule. The carbon atom is bonded to two hydrogen atoms, and there is a lone pair of electrons in one of the sp2 orbitals.

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The electrons released when water is split in the light reactions of photosynthesis are used to replenish the electrons lost by chlorophyll molecules, create a proton gradient, and produce ATP and NADPH. Oxygen is also released as a byproduct.

When water is split in the light reactions of photosynthesis, the electrons that are released are used to replenish the electrons lost by chlorophyll molecules as they are excited by absorbed light energy.

The process of water splitting occurs in the thylakoid membrane of the chloroplasts. The released electrons are then transferred to the electron transport chain, a series of protein complexes embedded in the thylakoid membrane.

As the electrons are passed through the electron transport chain, they release energy, which is used to create a proton gradient across the thylakoid membrane. This gradient is then used to power the production of ATP, the energy currency of the cell.

Ultimately, the electrons from water are used to reduce NADP+ to NADPH, a high-energy molecule that is used in the subsequent reactions of the Calvin cycle, which is responsible for the fixation of carbon dioxide into organic compounds. The oxygen released during water splitting is a byproduct of photosynthesis and is released into the atmosphere as molecular oxygen (O2).

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Answer:

Gravity

Explanation:

According to Newton's Law of Gravity, an object with mass will attract another object with mass.

Answer:

It breaks down food to create energy

The pressure exerted by the neon gas, when the volume is increased from 7.2 mL to 28.8 mL at constant temperature, can be calculated using Boyle's Law. The pressure exerted by the neon gas, when the volume is increased to 28.8 mL at constant temperature, is 0.375 atm.

Boyle's Law states that at constant temperature, the product of the pressure and volume of a gas remains constant. Mathematically, it can be expressed as P₁V₁ = P₂V₂. This law allows us to calculate the change in pressure when the volume changes.

In this case, the initial volume (V₁) is given as 7.2 mL, and the initial pressure (P₁) is 1.5 atm. The final volume (V₂) is 28.8 mL. By substituting these values into Boyle's Law equation, we can solve for the final pressure (P₂).

When we perform the calculations, we find that the pressure exerted by the neon gas, when the volume is increased to 28.8 mL, is 0.375 atm. As the volume increases, the pressure decreases due to the inverse relationship between pressure and volume.

Using Boyle's Law: P₁V₁ = P₂V₂

Given:

Initial volume (V₁) = 7.2 mL

Initial pressure (P₁) = 1.5 atm

Final volume (V₂) = 28.8 mL

To find the final pressure (P₂):

P₂ = (P₁ * V₁) / V₂

  = (1.5 atm * 7.2 mL) / 28.8 mL

  = 0.375 atm

Therefore, the pressure exerted by the neon gas, when the volume is increased to 28.8 mL at constant temperature, is 0.375 atm.

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The rules of base pairing (or nucleotide pairing) are: A with T: the purine adenine (A) always pairs with the pyrimidine thymine (T) C with G: the pyrimidine cytosine (C) always pairs with the purine guanine (G)

The nucleotides in a base pair are complementary which means their shape allows them to bond together with hydrogen bonds. The A-T pair forms two hydrogen bonds. The C-G pair forms three. The hydrogen bonding between complementary bases holds the two strands of DNA together.

Here is a MATLAB code that calculates and plots the concentration profiles of NH ₃, NH₄+, NO₂-, and NO₃- as a function of time at T=298 K and neutral pH, given the rate constants and initial concentrations:

```matlab

% Rate constants (k) and initial concentrations ([C])

k1 = 0.1;   % Rate constant for NH₃ + H₂O₂ -> NH₂ + H₂O

k2 = 0.05;  % Rate constant for NH₂ + NO₃- -> NO₂- + H₂O

k3 = 0.08;  % Rate constant for NO₂- -> NO₃- + N₂

C_NH₃ = 1.0;    % Initial concentration of NH₃

C_H2₂O₂ = 0.5;   % Initial concentration of H₂O₂

C_NH₄ = 0.0;    % Initial concentration of NH₄+

C_NO₂ = 0.0;    % Initial concentration of NO₂-

C_NO₃ = 0.0;    % Initial concentration of NO₃-

% Time vector

t = 0:0.1:10;   % Time range from 0 to 10 with a step size of 0.1

% Calculation of concentrations at each time point

for i = 1:length(t)

   NH₃(i) = C_NH₃ * exp(-k1*t(i));

   NH₄(i) = C_NH₃ - NH₃(i);

   NO₂(i) = C_NO₂ + k₂ * (NH₄(i) - C_NH₄) * t(i);

   NO₃(i) = C_NO₃ + k₃ * NO₂(i) * t(i);

end

% Plotting concentration profiles

plot(t, NH₃, 'r-', t, NH₄, 'g-', t, NO₂, 'b-', t, NO₃, 'm-');

xlabel('Time');

ylabel('Concentration');

legend('NH₃', 'NH₄+', 'NO₂-', 'NO₃-');

```

The provided MATLAB code calculates and plots the concentration profiles of NH₃, NH₄+, NO₂-, and NO₃- as a function of time based on the given rate constants and initial concentrations. The code uses a time vector to define the time range for which the concentrations will be calculated.

Inside the for loop, the concentrations of NH₃, NH₄+, NO₂-, and NO₃- are calculated at each time point using the given rate constants and the previous concentrations. The concentration of NH₃ decreases exponentially over time due to the reaction NH₃ + H₂O₂ -> NH₂ + H₂O, where k1 is the rate constant. NH₄+ concentration is the difference between the initial NH₃ concentration and the current NH₃ concentration.

The concentration of NO₂- increases with time due to the reaction NH₂ + NO₃- -> NO₂- + H₂O, where k₂ is the rate constant. The change in NH₄+ concentration from its initial value is multiplied by k₂ and the time to calculate the increase in NO₂- concentration.

Finally, the concentration of NO₃- increases with time due to the reaction NO₂- -> NO₃- + N₂, where k₃ is the rate constant. The previous NO₂- concentration is multiplied by k₃ and the time to determine the increase in NO₃- concentration.

The resulting concentration profiles are then plotted using the plot function, with time on the x-axis and concentration on the y-axis. Each compound is represented by a different color line in the plot.

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The molar absorptivity at 265 nm as it is a measure of how strongly a substance absorbs light at a specific wavelength, and it is typically reported in units of L·mol^-1·cm^-1.

To calculate the molar absorptivity at a specific wavelength, we can use the Beer-Lambert Law, which relates the absorbance (A) of a solution to the molar absorptivity (ε), concentration (c), and path length (l):

A = εcl

In this case, the absorbance (A) is given as 0.704, the concentration (c) is 2.36 x 10^-5 M, and the path length (l) is 1.00 cm.

Rearranging the equation, we can solve for the molar absorptivity (ε):

ε = A / (cl)

Substituting the given values:

ε = 0.704 / (2.36 x 10^-5 M * 1.00 cm)

Calculating this expression will give us the molar absorptivity at 265 nm. The molar absorptivity is a measure of how strongly a substance absorbs light at a specific wavelength, and it is typically reported in units of L·mol^-1·cm^-1.

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The two proteins with unequal molecular weights eluting simultaneously from a size exclusion chromatography (SEC) column is best explained by the porous structure of the column.A SEC column is used to fractionate proteins based on their size. The larger protein elutes first as it is unable to enter the pores of the column and therefore travels around the beads. Smaller proteins, on the other hand, can enter the pores of the column and take longer to elute.However, in this case, the proteins with unequal molecular weight eluted simultaneously from the SEC column. This can be best explained by the porous structure of the column. The SEC column has a very porous structure with a high capacity for separation. Due to the high porosity of the column, both the proteins passed through the pores at the same time leading to their simultaneous elution.A column with a more rigid structure such as ion exchange chromatography, does not allow for simultaneous elution of proteins with unequal molecular weights as the proteins get separated by their charges and affinity towards the resin.

Protein is a complex molecule that helps the body carry out its functions optimally. Protein can be found in several types of food such as beef, chicken, beans, eggs, fish and shrimp. Protein is a nutrient that is needed in large quantities. That's why protein is classified as a macro nutrient. Where is the best source of protein? Foods that come from the sea (seafood) are an excellent source of protein because they are usually low in fat. Fish like salmon do contain slightly higher levels of fat, but are still considered good foods for heart health.

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Answer: B

Explanation: molarity = concentration c= n/V = 0.5 mol/ 0.05 l = 10 mol/l

The molarity of  a solution is the number of moles of its solute divided by volume in liters. The molarity of the 50 ml solution containing 0.5 moles of potassium fluoride is 10 M or 10 molar.

Molarity is a common term used to express the concentration of a solution. It is the ratio of number of moles of solute particles to the volume of solution in liters. Hence, its unit is mol/L or molar.

The molarity of a solution is a colligative quantity as well as temperature dependent.

Given,

no.of moles of potassium fluoride salt in water = 0.5 moles.

volume of solution = 50 ml

1 L = 1000 ml

then 50 ml = 0.05 L.

Molarity = no.of moles of solute/ volume of solution in L

M = 0.5 moles/ 0.05 L

   = 10 M.

Therefore, the molarity of the given solution is 10 molar.

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(a)

Heptane is the limiting factor. as O2 can be found in air.

(b)

balanced equation: C7H16 + 11 O2 --> 7 CO2 + 8 H2O

moles of O2= mass/ mr

moles of O2= 25000/32

moles of O2 = 781.25 moles

According to molar ratio:  

11 : 7

moles of carbon dioxide:

(781.25/11) * 7

497.16 moles

using mass = moles * mr

mass of CO2 = 497.16  * 44 = 21875.04 g -- this is mass of CO2

To calculate the Ksp (solubility product constant) from the solubility of a compound, you need to follow these steps:

1. Write the balanced equation for the dissolution of the compound in water.
2. Identify the stoichiometry of the dissolved compound and the ions produced in the solution.
3. Write the expression for the Ksp using the stoichiometry of the ions and their concentration in the solution.
4. Use the solubility of the compound in water to calculate the concentration of the ions in the solution.
5. Substitute the ion concentrations into the Ksp expression and solve for the Ksp value.

For example, let's consider the dissolution of silver chloride (AgCl) in water:
AgCl(s) ⇌ Ag+(aq) + Cl-(aq)
The stoichiometry of the reaction tells us that one mole of AgCl produces one mole of Ag+ and one mole of Cl-. The Ksp expression for this reaction is:

Ksp = [Ag+][Cl-]
If we know that the solubility of AgCl in water is 1.2 x 10^-5 M, we can use this value to calculate the concentration of Ag+ and Cl- in the solution:
[Ag+] = [Cl-] = 1.2 x 10^-5 M
Substituting these values into the Ksp expression, we get:
Ksp = (1.2 x 10^-5)^2 = 1.44 x 10^-10

Therefore, the Ksp value for AgCl in water is 1.44 x 10^-10.

To calculate Ksp (solubility product constant) from solubility, follow these steps:
1. Write the balanced dissolution reaction: For the compound AB, the reaction would be AB(s) ↔ A⁺(aq) + B⁻(aq).
2. Determine the solubility: The solubility represents the concentration of the dissolved ions in a saturated solution, typically expressed in mol/L (molarity).
3. Set up the expression for Ksp: Ksp = [A⁺][B⁻], where [A⁺] and [B⁻] are the molar concentrations of the ions A⁺ and B⁻ in the saturated solution.
4. Calculate the Ksp: Plug in the solubility values you found in step 2 into the Ksp expression and solve for Ksp.
Remember that these steps are a general guideline and the actual calculation may differ depending on the specific compound and reaction being considered.

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The pH of the resulting solution cannot be determined with the given information.

To determine the pH of a solution resulting from the mixing of a strong acid (HCl) and a strong base (NaOH), we need to calculate the concentration of the remaining acid or base after the reaction occurs. However, the given information does not provide the volume of the resulting solution after mixing.

To calculate the concentration of the remaining acid or base, we can use the concept of stoichiometry and the balanced chemical equation for the reaction between HCl and NaOH:

HCl + NaOH → NaCl + H2O

From the balanced equation, we can see that the reaction is a 1:1 ratio between HCl and NaOH. Therefore, if we assume complete reaction, all the moles of HCl will react with an equal number of moles of NaOH.

The moles of HCl can be calculated as follows:

moles of HCl = volume of HCl (in L) × concentration of HCl (in mol/L)

= 0.050 L × 0.10 mol/L

= 0.005 mol

Since the reaction is 1:1, the moles of NaOH required to react completely with HCl is also 0.005 mol.

Now, if we assume that the resulting solution has a total volume of 150 mL (100 mL of NaOH + 50 mL of HCl), we can calculate the concentration of the remaining acid or base:

Concentration of remaining acid or base = moles of remaining acid or base / volume of resulting solution (in L)

= 0.005 mol / 0.150 L

= 0.0333 mol/L

However, to determine the pH, we need to know whether the remaining species is an acid or a base, as the pH calculation depends on the nature of the species. Without additional information, we cannot determine the pH of the resulting solution.

The pH of the resulting solution cannot be determined with the given information.

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The purpose of the lower air dam in the front of a vehicle is to improve aerodynamics and increase fuel efficiency. The air dam, also known as a front spoiler or splitter, is typically a protruding lip or panel located at the bottom of the front bumper.

When the vehicle is in motion, the air dam helps to redirect the airflow underneath the vehicle. It creates a smoother flow of air, reducing turbulence and minimizing drag. By reducing aerodynamic drag, the vehicle experiences less resistance, allowing it to move more efficiently through the air.

The improved aerodynamics provided by the lower air dam can result in reduced fuel consumption, as the engine does not have to work as hard to overcome air resistance. This makes the vehicle more fuel-efficient and can contribute to better overall performance.

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Mole is one of the International System of Units' seven foundation units (SI). Therefore, the mole ratio of Fe to CO in the reaction Fe\(_2\)O\(_3\)+ 3 CO \(\rightarrow\) 2 Fe + 3 CO₂ is 2:3.

A mole is merely a measuring unit. In reality, it is one of the International System of Units' seven foundation units (SI). When basically determines are insufficient, new units are created.

Chemical reactions frequently occur at levels that use grams would be inappropriate, but using actual figures of atoms/molecules/ions would also be misleading. As a result, scientists devised the moles to bridge the divide among extremely small and extremely huge numbers.  The mole ratio of Fe to CO in the reaction Fe\(_2\)O\(_3\)+ 3 CO \(\rightarrow\) 2 Fe + 3 CO₂ is 2:3.

Therefore, the mole ratio of Fe to CO in the reaction Fe\(_2\)O\(_3\)+ 3 CO \(\rightarrow\) 2 Fe + 3 CO₂ is 2:3.

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The name and chemical symbol of the given element whose electronic configurations are shown is:

a. Germanium and its symbol is Ge.

b. Niobium and its symbol is Nb.

The chemical symbol of an element is the symbol that is used to represent the atom of the element usually based on the name o the element.

The name and chemical symbol of the given element whose electronic configurations are shown is determined as follows:

a.) [Ar]4s¹3d¹⁰4p²5p¹

The atomic number of the element is 32

The element whose atomic number is 32 is Germanium and its symbol is Ge.

b.) [Kr]5s²4d²5p¹

The atomic number of the element is 41

The element whose atomic number is 32 is Niobium and its symbol is Nb.

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The bottoms of waste dumps should be lined with impermeable materials like clay or synthetic liners to protect aquifers from pollution.


Waste dumps can contain hazardous materials that can seep into the soil and contaminate groundwater, including aquifers, which are important sources of drinking water. Lining the bottoms of waste dumps with impermeable materials helps prevent these contaminants from leaching into the groundwater. Impermeable liners can include clay, plastic, or synthetic materials, and they are designed to create a barrier that prevents the movement of water and pollutants.

Lining the bottoms of waste dumps with impermeable materials is an important measure to protect the quality of groundwater and aquifers. It is important to properly design and maintain these liners to prevent leaks and ensure their effectiveness in preventing pollution.


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The oxidation number of the zinc in the ZnCl₂  is the +2.

The oxidation number, is also called as the oxidation state, the total number of the electrons that an atom either will gains or will loses in order to form the chemical bond with the another atom.

The oxidation number of the chlorine = -1

The oxidation number of the Zn is as follows :

Zn + 2( -1 ) = 0

Zn - 2 = 0

Zn = + 2.

The Oxidation number of an atom can be  defined as the charge that the atom appears will have on forming the ionic bonds with the other heteroatoms.

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Answer:

So its a theory by Alfred Wegener is that All land was one big piece of land called pangea in the early 20th century people began to think that land masses can move such as many do just from it being there or natural disasters then going in to more research they found that when putting the continents together it fit like a puzzle  and the fact that some fossils were far away from were the same were found

The theory of continental drift, based their theory on several lines of evidence, including the fit of the continents, paleoclimate indicators, truncated geologic features, and fossils.

The continental drift hypothesis states that all the continents were once joined together as one large mass of land, but then the land spread apart and drifted into their current positions.

The hot magma flows in convection currents due to tremendous heat and pressure within the earth. These currents cause the tectonic plates that make up the earth's crust to move.

Thus, The theory of continental drift, based their theory on many lines of evidence, including the fit of the continents, paleoclimate indicators, truncated geologic features, and fossils.

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The enthalpy of the reaction is 14 J/mol.

The enthalpy of a reaction (ΔH) is the amount of energy transferred between a system and its surroundings during a chemical reaction at constant pressure, measured in joules per mole (J/mol). This value is important because it can tell us whether a reaction is exothermic or endothermic, as well as give us information about the strength of chemical bonds within the reactants and products.To calculate the enthalpy of a reaction, we need to know the amount of energy released or absorbed (Q) and the number of moles of the compound involved in the reaction (n). We can use the equation:
ΔH = Q/n
Given that 6 moles of a compound produce 84 J of energy, we can calculate the enthalpy of the reaction as follows:
ΔH = Q/n
ΔH = 84 J / 6 mol
ΔH = 14 J/mol
This means that for every mole of the compound involved in the reaction, 14 J of energy is transferred between the system and the surroundings. Since the value is positive, we can conclude that the reaction is endothermic, meaning that it requires an input of energy to occur.It is worth noting that the enthalpy of a reaction can depend on a number of factors, such as temperature, pressure, and the specific conditions under which the reaction occurs. As such, it is important to take these factors into account when calculating or predicting enthalpy values.

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Answer:

ATP—Adenosine triphosphate, a nucleotide which is the most important short-term energy storage compound in cells. It is the “energy currency” of the cell, necessary for practically all metabolic activities. Carbohydrate—A type of organic molecule made of carbon, hydrogen, and oxygen.

Answer:

Static electricity is the result of an imbalance between negative and positive charges in an object. These charges can build up on the surface of an object until they find a way to be released or discharged.

Explanation:

Explanation:

a.) the ball comes back down because of the gravitational pull

b.)the car is non living because it runs on a engine (man made)

Answer:

Neon, Argon, Krypton, Xenon and Radon

Explanation:

The other elements that would be expected to have similar properties as the Helium from the periodic table are the noble gases.

The noble gases are a special group of elements belonging to the last group of the periodic table.

They are called the O group or inert group because elements in this group do not combine with other atoms due to their completely filled outermost shell.

This makes them unreactive and do not readily combine with other atoms.