Questions
Vacuoles are round organelles found in both plant and animal cells. Their primary function is to -
produce food and energy for the cell.
control the activities of the cell.
transport materials between parts of the cell.
O
store water, waste, and nutrients for the cell.

Answer:

rising water levels because of melting icebergs, and increased wildfires

Explanation:

Answer:

C. digestive; circulatory

Explanation:

It is the correct answer..

Approximately 194.0 grams of glucose (C6H12O6) would be required to prepare a 5000 mL solution with a concentration of 0.215 M.

To determine the mass of glucose (C6H12O6) required to prepare a 0.215 M solution in 5000 mL, we need to use the formula:

Molarity (M) = moles of solute / volume of solution (in liters)

First, let's convert the volume of the solution from milliliters (mL) to liters (L):

5000 mL = 5000/1000 = 5 L

Now, we can rearrange the formula to solve for moles of solute:

moles of solute = Molarity (M) x volume of solution (L)

moles of solute = 0.215 M x 5 Lmoles of solute = 1.075 mol

Since glucose (C6H12O6) has a molar mass of approximately 180.16 g/mol, we can calculate the mass of glucose using the equation:

mass of solute = moles of solute x molar mass of solute

mass of glucose = 1.075 mol x 180.16 g/mol

mass of glucose = 194.0 g (rounded to three significant figures)

Therefore, approximately 194.0 grams of glucose (C6H12O6) would be required to prepare a 5000 mL solution with a concentration of 0.215 M. It's important to note that the molar mass of glucose used in this calculation may vary slightly depending on the level of precision required.

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The states of matter are solid, liquid, gas, and plasma.

Addition of heat to a substance helps the molecules break the intermolecular forces of attraction.

Elements are pure substances consisting of same type of atoms while Compounds are pure substances consisting of two or more different atoms.

The states of matter are four types namely:

Addition of heat to a substance results in phase change as the heat added to the substance helps the molecules break the intermolecular forces of attraction.

Elements are pure substances consisting of entirely the same type of atoms, for example hydrogen.

Compounds are pure substances consisting of two or more different atoms, for example water.

A pure (hom0genous) substance consists of one more elements chemically joined together while mixtures consists of two or more substances physically joined together.

Physical changes are changes that can be easily reversed such as the melting of candle wax while chemical changes are changes that cannot be easily reversed such as rusting of iron.

The modern atomic theory is the theory that atoms consists of the three fundamental particles; electrons, protons and neutrons.

Democritus stated that all matter consists of atoms which are extremely small and indestructible.

Dalton stated that all elements consists of small indivisible particles called atoms and that atoms of the same element were alike in all respects.

Atoms consists of electrons which are found in energy levels or orbits around the nucleus where the protons and neutrons are found.

Isotopes are atoms of the same element having different masses.

Atomic number of an element is the number of protons in the atom while the mass number is the sum of protons and neutrons in the atom.

The period table of elements is arranged in increasing order of atomic number of elements into groups and periods.

In conclusion, matter is the main component of materials and it exists in four different states.

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The number of moles required to react with 4.70 mol Al is  7.05 mole of Cl₂.

The mole is the quantity of substance of a system that includes as many standard entities as there are atoms in zero.012 kilograms of carbon 12; its image is the mole.

The mole, symbol mol, is the SI unit of the quantity of substance. One mole carries exactly 6.022 140 76 × 1023 essential entities. This wide variety is the fixed numerical cost of the Avogadro regular, NA, whilst expressed in mol−1, and is referred to as the Avogadro variety.

The mole, symbol mol, is the SI unit of the quantity of substance. One mole includes precisely 6.022 a hundred and forty seventy-six x 1023 fundamental entities. This variety is the constant numerical price of the Avogadro consistent, NA, while expressed inside the unit mol–1 and is called the Avogadro number.

Calculation:-

2 Al + 3Cl₂ -----> 2AlCl₃

2 mole required  = 3 moles of Cl

therefore 5.70 moles of Al required = 3/2 × 4.70

                                                         = 7.05 mole of Cl₂

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6.02 x \(10^{20\) formula units of MgCl₂ is equal to 0.1 moles of MgCl₂.

To convert formula units of MgCl₂ to moles of MgCl₂, we need to use Avogadro's number, which relates the number of formula units to the number of moles.

Avogadro's number (NA) is approximately 6.022 x 10^23 formula units per mole.

Given that we have 6.02 x 10^20 formula units of MgCl₂, we can set up a conversion factor to convert to moles:

(6.02 x 10^20 formula units MgCl₂) * (1 mol MgCl₂ / (6.022 x 10^23 formula units MgCl₂))

The formula units of MgCl₂ cancel out, and we are left with moles of MgCl₂:

(6.02 x 10^20) * (1 mol / 6.022 x 10^23) = 0.1 mol

Therefore, 6.02 x 10^20 formula units of MgCl₂ is equal to 0.1 moles of MgCl₂.

It's important to note that this conversion assumes that each formula unit of MgCl₂ represents one mole of MgCl₂. This is based on the stoichiometry of the compound, where there is one mole of MgCl₂ for every one formula unit.

Additionally, this conversion is valid for any substance, not just MgCl₂, as long as you know the value of Avogadro's number and the number of formula units or particles you have.

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This technique has been used to identify the presence of gases such as oxygen, methane, and carbon dioxide in the atmospheres of exoplanets.  

i) To estimate the frequency of the violet (leftmost) emission, we can use the equation v = c/λ, where v is frequency, c is the speed of light (3.00 x 10^8 m/s), and λ is the wavelength of the emission in meters. The wavelength of the violet emission is 400 nm or 400 x 10^-9 m, so the frequency can be calculated as v = (3.00 x 10^8 m/s) / (400 x 10^-9 m) = 7.50 x 10^14 Hz.

ii) To estimate the energy of the violet emission, we can use the equation E = hv, where E is energy, h is Planck's constant (6.63 x 10^-34 Js), and v is frequency in Hz. Substituting the frequency calculated in part (i), we get E = (6.63 x 10^-34 Js) x (7.50 x 10^14 Hz) = 4.97 x 10^-19 J.

b. The spectral lines are produced by the electrons within the atoms of this element, which can absorb or emit specific amounts of energy to move between different energy levels. These energy transitions result in the emission or absorption of photons with specific wavelengths and frequencies, giving rise to the observed emission spectrum.

c. The violet emission line represents the photon with the most energy since it has the shortest wavelength (400 nm) and highest frequency (7.50 x 10^14 Hz) among the lines shown. This highest energy does not necessarily represent the energy of the valence electrons, but rather corresponds to the specific energy transitions occurring within the atoms of the element.

d. Emission spectra can be used to determine the gases present in the atmosphere of a far-away planet by analyzing the specific wavelengths of the emitted or absorbed light from the planet. Each gas has a unique emission or absorption spectrum, allowing scientists to identify the gases present in the planet's atmosphere.

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Answer:

Explanation:

Here, we want to balance the given equation

By balancing the chemical equation, it means that the number of atoms of each of the elements is present on both sides of the equation

We start by balancing the number of oxygen atoms. We simply place 3 behind the water molecule, then 2 behind the iron, and 3 behind the oxygen

We have that as:

What to do is On Form N-445, Notification of Naturalization Oath Ceremony, complete the questionnaire.Visit USCIS before your naturalisation ceremony and report there.Your Legal Resident Card must be returned (Green Card).To become an American citizen, you must take a Oath of Allegiance.

In a Nutshell:Application for Naturalization Form N-400 takes between 8 and 12 months to complete.On the USCIS website, keep records of your naturalisation application, and remain in touch wit your immigration attorney if you need any guidance.

$1,170.You have three options for paying the fee: cashier's check, personal check, or money order.You can pay with a credit card while submitting paperwork at the a USCIS lockbox by utilising Form G-1450, Permission for Card Transactions.

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Answer:

866.142 inches

Explanation:

By formula

Explanation:

The answer would be Berium because it can mix as well with other elements in the periodic table.

Barium is regarded as the most reactive elements out of all the options

provided.

Barium is an element with symbol Ba and atomic number 56. It belongs to

Group 2 metals whose reactivity increases as we go down the group.

The alkaline earth metals which are in Group 2 of the Periodic Table include

: beryllium, magnesium, calcium, strontium, barium, and radium

The increase in reactivity down the group is as a result of the decreasing

ionization energy required to form new compounds. The Ionization energy

decreases due to more inner shells and increase in distance from the

nucleus.

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Answer:

How do amoeba respire.

Define Diffusion.

Answer:

“Rams Caught in a Thicket” as an allusion to the biblical story of Abraham. They more likely represent goats, which could often be seen standing on their hind legs, to reach leaves in the trees, as seen here.

Answer:

Option B is correct: C6H1206(s) and HCl(g)

Answer:

hydrochloric acid

Explanation:

chemical compound any substance composed of identical molecules consisting of atoms

An exothermic reaction releases 325 kJ. 1359.8 kJ energy is this in calories.

An exothermic reaction is a chemical reaction that releases heat energy into the surroundings. During an exothermic reaction, the products of the reaction have less potential energy than the reactants, and the excess energy is released in the form of heat.

One calorie is defined as the amount of energy required to raise the temperature of one gram of water by one degree Celsius.

One joule is defined as the amount of energy required to apply a force of one newton over a distance of one meter.

1 cal = 4.184 J

1 cal = 0.004184 kJ

325000 cal = x kJ

0.004184/ 1 = x / 325000

x = 1359.8 kJ

Thus, 1359.8 kJ energy is this in calories.

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The statement that best describes the activation energy on the graph below is the vertical difference between 1 and 2 (option B).

Activation energy is the energy required to initiate a reaction. For example, the flame from the fuse of a firecracker provides a small initial amount of energy, after which the explosive reaction proceeds by itself, releasing a considerably larger quantity of energy.

According to this question, a reaction proceeds from 1 to 3. The activation energy needed for the reaction to be initiated is the vertical line that extends to the peak of 2.

Therefore, it can be said that the statement that best describes the activation energy on the graph below is the vertical difference between 1 and 2.

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Answer:

0.84 g/cm3 EDGE 2020

Explanation:

Answer:

What is the density of the football while it is deflated?

⇒ 0.84 g/cm3

By equalising LHS with RHS,balanced chemical equation is:[2] Na + [2] H2O  = [2] NaOH + [1] H2

Balancing is necessary for all chemical equation.The purpose to balance chemical equations are to make both sides of the reaction,reactants and products, equal in the no. of atoms per element.

If Sodium is multiplied by two, the no. of Sodium atoms are in balance.By the process of balancing we can also keep a check on the rightness of the equation.

Sodium hydroxide and Hydrogen gas is product of this reaction.NAOH dissolves in water and contains hydroxide anions(OH-) and sodium cations(Na+).

The balanced equation is 2Na + 2H2O = NaOH + H2

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Answer:

Option C

Explanation:

The equation for showing gravitational pull or force between two objects is as follows -

\(G_f = \frac{G M_1M_2}{r^2}\)

Here Gf is the gravitational force

G is the gravitational constant and

M1 and M2 is the mass of the two objects

As we can see in the equation, that mass of two objects is directly proportional to the gravitational pull between them.

The higher the mass, the higher will be the force.

While on the other hand the distance between the two objects i.e "r" is inversely proportional. The higher the distance between the two objects the lower is the gravitational force between them.

Hence, option C is correct

Answer:

7

Explanation:

The pH of water is 7.

 pH is the convenient scale for expressing the level of acidity or alkalinity of aqueous solutions.

An acidic solution has a pH value less than 7.

As pH decreases, the acidity of solutions increases.

Neutral solutions have a pH of 7.

An alkaline solutions has a pH greater than 7 and the level of alkalinity increases as the pH increases.

  Water has a pH of 7 because the concentration of hydrogen and hydroxyl ion is equal.

Answer:

A graph can be very handy in collecting data and storing it in one place. A graph can be a very effective tool in presenting visual information rather swiftly. Hope this helps! I am learning about graphs in my course!

Explanation:

Answer:

graph) a diagram showing the relation between variable quantities, typically of two variables, each measured along one of a pair of axes at right angles.

Explanation:

Graphing is used daily. From stockbrokers to performance evaluation in companies. All use them to boost sales and meet deadlines. Even simple calculations can be assessed better by using a graph.

(let me know if this helps?)

The organic phase is a solvent, usually dichloromethane or diethyl ether, that disperses very little in water. The 9-fluorenone was dried, isolated, and saltified with sodium sulfate.

There are a number of extraction processes, including solvent extraction, distillation, pressing, and sublimation, that can be used. Solvent extraction is the method that is most frequently used.

extracting liquid from liquid When a substance is "extracted," it is moved from a solid or liquid into a separate solvent or phase. The method most frequently used in chemical labs is liquid-liquid extraction, which takes place in a separatory funnel.

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Answer:

Newtonian fluids have a constant viscosity that does not change and non newtonain fluids have a viscosity that varies.

Explanation

Newtonian fluids have a constant viscosity and a zero shear rate at zero shear stress. Non-Newtonian fluids have a variable viscosity and a varible relationship with shear stress.

The efficiency : 95%

Efficiency : the ratio between output and input work

In general, the value of the output of a machine is less than the value of the input because of the frictional force in the machine.

The greater the efficiency of the engine, the better the machine

Can be formulated :

\(\tt E=\dfrac{W_{out}}{W_{in}}\times 100\%\)

w output = 190 J

W input = 200 J

The efficiency :

\(\tt E=\dfrac{190}{200}\times 100\%=95\%\)

Answer:

Sharing electrons forms a covalent bond between the atoms

Explanation:

A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.

Answer:Proton and neutron

Explanation: