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Julia made a model of a cell in a clear plastic zipper bag. She used a marble for the nucleus and pinto beans for mitochondria.
Which of the following options would be best for making her model more like a plant cell?
A. Take the marble out of the bag.
B. Put the bag inside a clear plastic box.
c. Take the pinto beans out of the bag.
D. Put the bag inside a larger clear plastic bag.
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The number of oxygen four the reaction is four using conservation laws.

The reaction between one molecule of methanol (CH3OH) and one molecule of salicylic acid (C7H6O3) to form an ester molecule (C8H8O3) and one molecule of water (H2O) can be represented by the following equation:

CH3OH + C7H6O3 → C8H8O3 + H2O

To determine the number of oxygen atoms in the reactants and products and show that they are conserved, we can count the number of oxygen atoms on both sides of the equation:

Reactants: 1 x O (from CH3OH) + 3 x O (from C7H6O3) = 4 x O atoms

Products: 3 x O (from C8H8O3) + 1 x O (from H2O) = 4 x O atoms

As we can see, there are four oxygen atoms on both sides of the equation, which confirms the conservation of atoms according to the law of conservation of mass. Therefore, the number of oxygen atoms in the reaction is four.

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Answer:

a)Mg(s) + 2HCl(aq) -------> MgCl2(aq) + H2(g)

b) 0.125 moles of hydrogen gas is reduced in the reaction.

C) 3.18 L

d)2.25 g of water

Explanation:

a) the equation of this reaction is;

Mg(s) + 2HCl(aq) -------> MgCl2(aq) + H2(g)

b)

Number of moles= concentration × volume= 1.0 × 250/1000 = 0.25moles of HCl

From the equation;

2 moles of HCl yields 1 mole of hydrogen gas

Hence 0.25 moles of HCl yields 0.25 × 1/2 = 0.125 moles of hydrogen gas

Thus 0.125 moles of hydrogen gas is reduced in the reaction.

c)

P= 760 mmHg (standard pressure)

V= ????

T= 298 K

n= 0.125 moles

R= 0.082 atm dm-3K-1mol-1

Since the gas is collected over water, SVP of hydrogen at 25°c is 28mmHg

Therefore; P=760-28= 732mmHg

But

1 atm =760 mmHg

Therefore 732 mmHg= 732/760= 0.96 atm

PV=nRT

V= nRT/P

V= 0.125 × 0.082 × 298/0.96

V= 3.18 L

Note 1dm-3=1L

d)

2H2(g) + O2(g) ----> 2H2O(g)

From the equation;

2 moles of hydrogen yields 2 moles of water

0.125 moles of hydrogen yields 0.125 moles of water

Mass of water = 0.125 moles × 18gmol-1 = 2.25 g of water

The compound that has ionic bonds is KBr (potassium bromide). Therefore the correct option is Option E.

Ionic bonds develop when two atoms with significantly differing electronegativities create a bond in which one atom (the metal) contributes electrons to the other atom (the non-metal). Potassium (K) is a metal in KBr, while bromine (Br) is a nonmetal. The electronegativity of K is low, whereas that of Br is high. When K and Br bond, K contributes its valence electron to Br, resulting in an ionic bond.

The other chemicals listed, on the other hand, have covalent bonding. When atoms with similar electronegativities share electrons in order to produce a more stable electron configuration, covalent bonds occur.

a. H2O has covalent bonds;

b. O2 contains covalent bonds; and

c. Ne is a noble gas that does not create bonds.

d. CO contains covalent bonds.

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Answer:

Ionization energy

Explanation:

Answer:

What are you a 6 yo? Anyways, the most common properties are, They are good conductors of electricity, They are lustrous and They are sonorous.

Answer:

In the primary visual cortex, simple cells are one of two physiological categories of cells. They have receptive fields that are made up of elongated, contiguous On and Off subregions that inhibit each other.

The reactivity of elements generally increases as you go down a group in the periodic table. This is because elements in the same group have the same number of valence electrons, and as you go down a group, the number of valence electrons increases. This causes the atoms to have a higher positive charge, which makes them more reactive because they are more likely to form chemical bonds with other atoms.

However, the reactivity of elements decreases as you go down group 7 (the halogens) in the periodic table. This is because the valence shell of these elements is already full, so they are less likely to form chemical bonds with other atoms. As a result, the atoms in group 7 are less reactive than those in other groups.

The molecules that possess dipole moments are those that have polar bonds and are not symmetrical in shape.

BH3 and CH4 both have nonpolar covalent bonds, so they do not have dipole moments. PCl5 has polar bonds, but it is a symmetrical molecule and the dipole moments cancel each other out, so it does not have a net dipole moment. H2O, HF, and H2 all have polar bonds and are not symmetrical, so they have dipole moments. Therefore, the answer is C) 3.

To determine how many of the following molecules possess dipole moments: BH3, CH4, PCl5, H2O, HF, H2, we will analyze each molecule's structure and polarity.
1. BH3: Boron trifluoride is a symmetrical trigonal planar molecule with no net dipole moment.
2. CH4: Methane is a symmetrical tetrahedral molecule with no net dipole moment.
3. PCl5: Phosphorus pentachloride is a symmetrical trigonal bipyramidal molecule with no net dipole moment.
4. H2O: Water is a bent molecule with two lone pairs on the oxygen atom, creating a net dipole moment.
5. HF: Hydrogen fluoride is a linear molecule with a large electronegativity difference between hydrogen and fluorine, resulting in a net dipole moment.
6. H2: Hydrogen gas is a diatomic molecule with no difference in electronegativity between the hydrogen atoms, so there is no net dipole moment.
Hence, the correct answer is B) 2 molecules (H2O and HF) possess dipole moments.

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ANSWER

the volume of the solution is 2.05 liters

EXPLANATION

Given that;

The concentration of Ca(OH)2 is 0.420M

The grams of Ca(OH)2 is 64.0 grams

Follow the steps below to find the volume of the solution

Step 1; Calculate the number of moles of Ca(OH)2 using the below formula

Recall, that the molar mass of Ca(OH)2 is 74.093 g/mol

Step 2; Find the volume of the solution in liters using the below formula

Therefore, the volume of the solution is 2.05 liters

Answer:

10250.8

Explanation:

Formula

multiply the energy value by 4184

Answer:

It must be large

Random

Explanation:

For a sample to represent a population accurately, it must be large and contain random sample spaces.

A population is a group of organism of the same species living in a particular place where they can reproduce.

The mass of AgCl(s) produced when excess AgNO₃ is added to the solution is approximately 1.55 grams.

To determine the mass of AgCl(s) produced when excess AgNO₃ is added to the solution, we need to calculate the number of moles of [Co(NH₃)₅Cl]Cl₂ and use the stoichiometry of the reaction to determine the moles of AgCl(s) formed. Then we can convert the moles of AgCl(s) to grams using its molar mass.

Given:

Mass of [Co(NH₃)₅Cl]Cl₂ = 1.45 g

First, let's calculate the number of moles of [Co(NH₃)₅Cl]Cl₂:

Molar mass of [Co(NH₃)₅Cl]Cl₂ = 267.52 g/mol

Moles of [Co(NH₃)₅Cl]Cl₂ = Mass / Molar mass

= 1.45 g / 267.52 g/mol

≈ 0.00542 mol

According to the balanced chemical equation for the reaction between [Co(NH₃)₅Cl]Cl₂ and AgNO₃, we have the following stoichiometry:

[Co(NH₃)₅Cl]Cl₂ + 2AgNO₃ → Co(NH₃)₅(NO₃) + 2AgCl(s)

From the equation, we can see that 1 mol of [Co(NH₃)₅Cl]Cl₂ produces 2 moles of AgCl(s). Therefore, the number of moles of AgCl(s) formed will be twice the moles of [Co(NH₃)₅Cl]Cl₂:

Moles of AgCl(s) = 2 x Moles of [Co(NH₃)₅Cl]Cl₂

= 2 x 0.00542 mol

= 0.01084 mol

Finally, we can calculate the mass of AgCl(s) formed:

Molar mass of AgCl = 143.32 g/mol

Mass of AgCl(s) = Moles of AgCl(s) x Molar mass of AgCl

= 0.01084 mol x 143.32 g/mol

≈ 1.55 g

Therefore, the mass of AgCl(s) produced when excess AgNO₃ is added to the solution is approximately 1.55 grams.

The correct question is:

1.45 g sample of [Co(NH₃)₅Cl]Cl₂ is dissolved in water. Calculate the mass (in grams) of AgCl(s) produced when excess AgNO₃ is added to the solution.

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The thermometer will read -10°C after about 2.43 minutes.

(a) After four more minutes, the thermometer will read -1°C.

This is because the temperature difference between the room and outdoors is (24 - (-11)) = 35°C.

The thermometer then rises 7°C in one minute, so the thermometer is heated at 7°C/minute, i.e. 35°C in five minutes.

So the temperature of the thermometer after 4 more minutes is 7°C + 7°C + 7°C + 7°C = 28°C, 28°C - 35°C = -7°C, -7°C - 3°C = -10°C.

Thus the reading on the thermometer will be -1°C after four more minutes.

(b) To find out when the thermometer will read -10°C, use the formula:

time = (temperature difference ÷ heating rate) + time to start

       = (-10°C - 7°C) ÷ 7°C/minute + 1 minute

       = -17°C ÷ 7°C/minute + 1 minute≈ -2.43 minutes

Thus, the thermometer will read -10°C after about 2.43 minutes.

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When making an electrical measurement such as pH, two electrodes must be used to ensure accuracy and consistency in the results. The first electrode is called the reference electrode, which provides a stable reference potential for the second electrode, known as the indicator electrode, to measure against.

The reference electrode is typically made of a stable, non-reactive metal, such as silver or silver chloride, and is immersed in a solution with a known and stable pH value. This creates a stable electrical potential that can be used as a reference point for the indicator electrode. The indicator electrode, on the other hand, is designed to respond to changes in pH by generating a voltage that is proportional to the pH level of the solution being measured.

By using two electrodes, the measurement process is made more accurate because it eliminates external factors that could affect the accuracy of the measurement. For instance, if only one electrode was used, any changes in temperature, pressure, or the chemical composition of the solution could affect the electrical potential and result in inaccurate readings. With two electrodes, the reference electrode provides a stable reference point, while the indicator electrode is only affected by the pH level of the solution being measured. This ensures that the electrical measurement is consistent and reliable.

In summary, using two electrodes to make an electrical measurement such as pH is essential to ensure accuracy and consistency of the results.

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2 Sodium azide(s) 2 Sodium(s) + 3 Nitrogen(g) is the balanced chemical equation for the breakdown of sodium azide (Sodium azide). As a result, 13.65 moles of Nitrogen gas will be created from 9.1 mol of Sodium azide.

According to Avogadro's law, a gas's total number of atoms or molecules is directly proportional to the volume of gas that gas occupies at a given pressure and temperature. The formula for Avogardro's equation is V = k n or V1/n1 = V2/n2.

We can use the following ratio to determine how many moles of Nitrogen gas are created by the breakdown of 9.1 mol of Sodium azide:

2 mol Sodium azide / 3 mol Nitrogen = 9.1 mol Sodium azide/ x mol Nitrogen

where x represents the quantity of Nitrogen generated in moles.

After finding x, we obtain:

x = 9.1 mol Sodium azide × 3 mol Nitrogen / 2 mol Sodium azide

x = 13.65 mol Nitrogen

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Answer:

Carbon disulfide, CS2 , will have a total of 16 valence electrons, 4 from the carbon atom and 6 from each of the two sulfur atoms.

Explanation:

Your Welcome!

Answered By : TrinTrinPrinted!

The total electron pairs in the structure of Carbon disulfide (CS₂) is 8 electron pairs.

Electron pair is, two electrons occupying the same orbital in an atom or molecule.

CS₂ is Carbon disulfide, it will have a total of 16 valence electrons, 4 from the carbon atom and 6 from each of the two sulfur atoms.

The 16 valence electrons will form 8 electron pairs.

Thus, the total electron pairs in the structure of Carbon disulfide (CS₂) is 8 electron pairs.

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The index of hydrogen deficiency (IHD) for the molecule C6H14 is 2, indicating the presence of two types of unsaturation, which can include double bonds, rings, or a combination of both.

The formula C6H14 represents a molecule with 6 carbon atoms and 14 hydrogen atoms. To calculate the index of hydrogen deficiency (IHD), we need to compare the actual number of hydrogen atoms in the molecule with the maximum number of hydrogen atoms possible for a molecule with the same number of carbon and heteroatoms.
The maximum number of hydrogen atoms for a saturated molecule can be calculated using the formula (2n + 2), where n is the number of carbon atoms. In this case, the maximum number of hydrogen atoms is (2 * 6 + 2) = 14.

The IHD can be calculated using the formula (2n + 2 - H)/2, where n is the number of carbon atoms and H is the actual number of hydrogen atoms in the molecule. Substituting the values, we get (2 * 6 + 2 - 14)/2 = 2.
The IHD of 2 suggests that there are two types of unsaturation point present in the molecule. The possible types of unsaturation include double bonds and rings. Therefore, the molecule with the formula C6H14 can have either double bonds or rings or a combination of both.

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Answer:

Saber tooth tiger

Explanation:

Saber tooth tiger is pretty dangerous and around the world are few meaning were killed

Velocity increased as mass grew is the proper explanation for the variations in the distances that the balls travelled.

The average kinetic energy of the particles in a substance is measured by its temperature. A substance's thermal energy can be used to calculate the total kinetic energy of its constituent particles. With increased particle mobility, a substance's temperature and thermal energy rise.

Energy is transmitted to the object once the work is accomplished, at which point it moves at a new, constant speed. Kinetic energy is a form of transferable energy that depends on the mass and speed attained.

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Answer:

1. Na2SO4 + Ba(NO3)2 → NaNO3 + BaSO4

2. NaNO3 + NH4Cl → NaCl + NH4NO3

4. Sorry, I don't know

5. Refer to the attachment..

6. NaC2H3O2(aq) + AgNO3(aq) = NaNO3(aq) + AgC2H3O2

\( \huge{\blue{Thank \: you}}\)

The maximum mass of carbon dioxide that could be produced by the chemical reaction is 10.384g

The balanced chemical equation for the reaction is

2C₈H₁₈(l) + 25O₂(g) → 16CO₂(g) + 18H₂O(g)

This means 2 moles of octane will react with 25 moles of oxygen to produce 16 moles of carbon dioxide and 18 moles of water.

Now, we will determine the number of moles of each reactant present

For Octane (C₈H₁₈)

Mass = 6.9 g

Molar mass = 114.23 g/mol

From the formula

Number of moles = Mass/ Molar mass

Number of moles of octane present = 6.9/114.23

Number of moles of octane present = 0.0604 moles

For Oxygen (O₂)

Mass = 11.8 g

Molar mass of oxygen = 32 g/mole

∴ Number of moles of oxygen = 11.8/32

Number of moles of oxygen = 0.369 moles

From the balanced chemical equation,

2 moles of octane reacts with 25 moles of oxygen

∴ x moles of octane will react with 3.125 moles of oxygen

x = (0.369x2)/25

x = 0.0295 moles

∴ Only 0.0295 moles of octane will react with the 0.369 moles of oxygen

Now,

If 2 moles of octane reacts with 25 moles of oxygen to produce 16 moles of carbon dioxide

Then,

0.0295 moles of octane will react with 0.369 moles of oxygen to produce (0.0295×8) moles of carbon dioxide

0.295 x 8 = 0.236 moles

∴ 0.236 moles of carbon dioxide was produced during the chemical reaction

Now, for the mass of carbon dioxide that could be produced

From the formula

Mass = Number of moles × Molar mass

Number of moles of carbon dioxide = 0.236 moles

Molar mass of carbon dioxide = 44 g/mol

∴ Mass of carbon dioxide = 0.236 × 44

Mass of carbon dioxide = 10.384 g

Hence, the maximum mass of carbon dioxide that could be produced by the chemical reaction is 10.384 g

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Answer:

chlorate changes to chlorous acid

Answer:

C

Explanation:

Because the car is moving forward with an increasing velocity, it has a positive acceleration.

Answer:

Explanation:

Question

Which of the following has a positive acceleration?

A. A car sits at rest at a stop sign.

B. A car is slowing down as it approaches a traffic light. a

C. A car increases its speed moving forward.

D. A car is in cruise control at a constant speed.

Positive acceleration is when there is a positive increase in velocity over time.

C.  is the only choice that shows a positive increase in velocity over time.    

A. and D. show NO change in velocity, while B. shows a negative change.                                                          

Answer:

the required temperature of uranium hexafluoride is 54156.25 K

Explanation:

Given the data in the question;

We know that average speed is;

u = \([ 3RT / MM ]^{1/2\) ----------- let this be equation 1

where MM is the molar mass

T is temperature

R is universal gas constant and u is the average speed.

First we get the average speed of H₂

\(U_{H}\)₂ =  \([ 3RT_H_2 / MM_H_2 ]^{1/2\) ------ let this be equation 2

Next is the average speed of UF₆

\(U_{UF\)₆ = \([ 3RT_{UF_6} / MM_{UF_6} ]^{1/2\) ------ let this be equation 3

given that; both have the same average speed, equation 2 = equation 3;

\([ 3RT_H_2 / MM_H_2 ]^{1/2\) = \([ 3RT_{UF_6} / MM_{UF_6} ]^{1/2\)

we multiply both sides by 1/3R and also square both sides.

\([ T_H_2 / MM_H_2 ]\) = \([ T_{UF_6} / MM_{UF_6} ]\)

given that; temperature of hydrogen T\(_{H\)₂ = 37°C = ( 37 + 273.15)K = 310.15 K

we know that Molar mass of H₂; MM\(_{H\)₂ = 2.016 g/mol  

and molar mass of  UF₆; MM\(_{UF\)₆ = 352.02 g/mol

so we substitute

[ 310.15 K / 2.016 g/mol  ] = [ T\(_{UF\)₆ / 352.02 g/mol ]

T\(_{UF\)₆ = [ 352.02 g/mol  × 310.15 K ] / 2.016 g/mol

T\(_{UF\)₆ = 109179.003 K/ 2.016

T\(_{UF\)₆ = 54156.25 K

Therefore, the required temperature of uranium hexafluoride is 54156.25 K

Answer:

I cannot give you all the answer but I can help you to solve those.

Explanation:

The first question:

How many grams are there in 7.5×\(10^{23}\) molecules of \(H_{2} SO_{4}\)?

So we need to find the molecular mass first, use your periodic table,

And then we can find out 2+32+16×4=98 g/mol

Then, we need to find how many moles, by using Avogadro's constant:

Avogadro's constant: 1 mole = 6.02×\(10^{23}\)

∴\(\frac{7.5*10^{23} }{6.02*10^{23}}\)=1.25 mol(2d.p.)

Lastly, find the grams using the formula \(M= \frac{m}{n}\)

m=Mn

m=1.25*98

m=122.5g

-------------------------------------------------------------------------------------------------------------

In conclusion, use those formula to help you:

\(M= \frac{m}{n}\) (which M = molecular mass(atomic mass) m=mass of the substance and n = moles)

Avogadro's constant: \(\frac {molecular mass} {6.02*10^{23}} = moles\)

The three steps of enzymes are catalyzed. The primary steps of an enzyme-catalyzed response are: substrate and enzyme combine, forming an E-S complex.

The response then occurs, changing the substrate into merchandise and forming an enzyme merchandise complicated. The merchandise then go away the energetic site of the enzyme. The first step of an enzyme catalyzed response is catalytic turnover the binding of substrate via way of means of the enzyme the discharge of product dissociation of the ES complicated ES -> E + P. An enzyme-catalyzed response may be more or less divided into 3 stages: enzyme-substrate binding, "catalysis" and product release.

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Answer:

Protons and Neutrons have approximately the same mass.

Equal numbers of protons and electrons make an atom neutral.

Protons have a positive charge

Explanation:

Protons and Neutrons have approximately the same mass. - both are 1 amu

Equal numbers of protons and electrons make an atom neutral. - protons are +1 and electrons are -1, so they cancel each other if there are equal amounts.

Protons have a positive charge - this is true.

Lithium (Li) is less reactive than potassium (K) because the valence electrons in lithium atoms are closer to the nuclei and harder to remove. Option D

The periodic table has to do with an arrangement of the elements in their order of reactivity. We know that the periodic table is arranged in groups and periods. The groups are the vertical portions while the periods are the horizontal portions.

Given that the reactivity would depend on the position of an element in the periodic table, we would look at where the elements that are to be considered are found in the periodic table.

We know that the elements that occur down the group for the metals are more reactive because they are more shielded thus they leave the attractive force of the nucleus much more easily.

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Missing parts;

Elements are organized on the periodic table based on their properties. Which statement correctly predicts and explains the chemical reactivity of two different metals? Barium (Ba) is less reactive than calcium (Ca) because the valence electrons in calcium atoms are farther from the nuclei and harder to remove. Strontium (Sr) is more reactive than magnesium (Mg) because the valence electrons in strontium atoms are farther from the nuclei and harder to remove. Rubidium (Rb) is more reactive than sodium (Na) because the valence electrons in sodium atoms are closer to the nuclei and easier to remove. Lithium (Li) is less reactive than potassium (K) because the valence electrons in lithium atoms are closer to the nuclei and harder to remove.