Bohr's model was correct in assigning energy levels to electrons.

Answer:

Diagram A: Balanced Forces

These forces are balanced, so the motion of the object stays the same. The object in the diagram could be sitting still, or it could be moving. But its motion is not changing. This is because the forces acting on it from opposite sides are exactly the same size.

Explanation:

Answer:

Because a balanced force can keep an object moving at a constant velocity.

Explanation:

Answer:

Charles's law

Explanation:

The expression:

     V1/T1 = V2/T2

represents Charles's law

The law states that "the volume of a fixed mass of a gas varies directly as its absolute temperature if the pressure is constant".

 So,

    V1/T1 = V2/T2

Pressure and the number of moles are constant

V and T are the volume and temperature

1 and 2 are the initial and final states.

Answer:

charle's law

Explanation:

A. Cytoplasm is the correct answer!

molar mass of potassium is 39.0983 g/Mol

using conversion factors

0.82 Mol K (39.0983 g/ 1 mol)

mol cancels out, leaves you w grams

answer: 32.1 grams K

Answer:

1. MG

2. N

3. F

4. NA

5. O

6. K

Answer:

Largest to Smallest: Na, K, Mg, N, O, F

Explanation:

Answer:

the answer is C galactose

Answer:

a. gluconic acid

Explanation:

The answer to the above question is B.

The following chemical reaction KOH + HCl → KCl + H2O is a type of single replacement reaction and the salt is Pottasium chloride.

A single replacement reaction is a type of reaction that involves the substitution of one element in a compound with another.

The following reaction is given in this question;

KOH + HCl → KCl + H2O

Pottasium displaces hydrogen in this equation to form pottasium chloride salt. Therefore, it is a type of single replacement reaction.

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Answer:

Copper and silver are the best conductors, but gold connections outlast both of them because they do not tarnish. It is not that the gold lasts longer, but that it remains conductive for a longer time. Gold is ductile: It can be drawn out into the thinnest wire.

Explanation:

Every burette reading must have two decimal places, with the second number being either 0 or 5. A percentage error of 0.2% is produced for each reading by a one-drop mistake in a volume of 25.00 cm3. You could attempt to put the measurements and methods together.

In terms of percentage, relative uncertainty equals x x 100. If we know the relative uncertainty, we may use the formula absolute uncertainty = relative uncertainty 100 measured value to determine the absolute uncertainty. As a result, the uncertainty of the mass measurement and the uncertainty of the density determination affect the uncertainty of the volume, which means that the factors determining the uncertainty accumulate as each physical quantity is measured.

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Strontium ( Atomic Number 38 ) undergoes beta minus decay. Atomic mass of Strontium is 90 u. The given reaction shows the complete nuclear reaction of Strontium.

⁹⁰₃₈ Sr → ⁹⁰₃₇ Y + ⁰₋₁ β + ⁻∨ₑ

Beta particle β is a high speed electron. Whenever Strontium undergoes beta minus decay, the neutron located inside its nucleus gets converted into proton. During the same reaction, a beta particle and electron antineutrino are also being released or emitted.

In the nuclear reaction ( Beta minus decay ) of Strontium, mass and charge are conserved. 

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Answer: 3 moles of HCl

Explanation: let’s do a balanced chemical equation

Al(OH)3 + 3HCl —> AlCl3 + 3H2O

We see that for every 1 mole of Al(OH)3 we need 3 moles of HCl

Answer:

D. 1.48atm

Explanation:

Van der waals equation is given as:

(P +an²/v²) (v - nb) = nRT

Where;

P = pressure (atm)

V = volume (L)

R = gas constant (0.0821 Latm/molK)

a and b = gas constant specific to each gas

T = temperature (K)

n = number of moles

According to the given information; V = 22.4L, T = 0.00°C (273.15K), R = 0.0821 Latm/molK, a = 6.49L^2-atm/mol^2, b = 0.0562 L/mol, n = 1.5mol

Hence;

(P + 6.49 × 1.5²/22.4²) (22.4 - 1.5×0.0562) = 1.5 × 0.0821 × 273.15

(P + 6.49 × 2.25/501.76) (22.4 - 0.0843) = 33.638

(P + 0.0291) (22.316) = 33.638

22.316P + 0.649 = 33.638

22.316P = 33.638 - 0.649

22.316P = 32.989

P = 32.989/22.316

P = 1.478

P = 1.48atm

Answer:

1. mol/L

2. 0.120 M

Explanation:

1. Molarity is equal to the moles of solute divided by the liters of solution. The units of molarity are mol/L.

2.

Step 1: Given data

Step 2: Calculate the moles of solute (n)

The molar mass of NaCl is 58.44 g/mol.

n = 5.25 g × 1 mol/58.44 g = 0.0898 mol

Step 3: Determine the molarity of the solution

We will use the definition of molarity

M = n/V

M = 0.0898 mol / 0.7500 L = 0.120 M

Answer:

Synthesis

Explanation:

Answer:

A

Explanation:

because they have 1 process

Answer:

The correct answer is 1.10.

Explanation:

Based on the given information, the molarity of the NaOH is 0.15 M, that is, 0.15 moles per liter of the solution.

Now the moles present in the 15 ml of the solution will be,  

0.015 × 0.15 = 2.25 × 10⁻³ moles of NaOH or 0.0025 moles of NaOH

Now, molarity of the HNO₃ given is 0.20 M, which means 0.2 moles per liter of the solution.  

Now the moles present in the 30 ml of the solution will be,  

0.030 × 0.2 = 0.006 moles of HNO₃

Now the complete disintegration of acid and base will be,  

NaOH (aq) (0.025 moles) ⇔ Na⁺ (aq) (0.025) + OH⁻ (aq) (0.025 moles)

HNO₃ (aq) (0.006 moles) ⇔ H⁺ (0.006 moles) + NO₃⁻ (aq) (0.006 moles)

Now the additional Hydrogen ions at titration point is,  

= 0.006 - 0.0025 = 0.0035 moles of H+

Now the concentration of H+ ions in the 45 ml of the solution will be,  

= 0.0035/45 × 1000

= 0.078 M

pH = -log[H⁺] = -log [0.078]

= 1.10

Answer:

Option B. 0.5 N.

Explanation:

Data obtained from the question include:

Mass (m) = 1 Kg

Acceleration (a) = 0.5 m/s²

Force (F) =?

Force is defined as the product of mass (m) and acceleration (a). Mathematically, it is expressed as:

Force (F) = mass (m) × acceleration (a)

F = ma

Using the above equation, we can obtain the force exerted on the floor as follow:

Mass (m) = 1 Kg

Acceleration (a) = 0.5 m/s²

Force (F) =?

F = ma

F = 1 × 0.5

F = 0.5 N

Thus, the car exerted a force of 0.5 N on the floor.

Answer:

2/3

Explanation:

Crystals structures can also be seen when two elements combines together and the perfect example is Al₂O₃ which is given in the question above. Just like it is given in the question above, the kind of arrangement in the crystal structure for Al₂O₃ is called HCP which stands for Hexagonally Closed Pack.

The aluminum ions which is in form of Al³⁺ occupies the two-third[2/3] positions while the position that the oxygen ion occupies is one[1].

Answer:

2C2H6 + 7O2 → 4CO2 + 6H2O

Explanation:

First off you find them by balancing the equation ( equal amounts of elements on both sides) So add a two infront of the C2H6. Now you have 4 Carbons and 12 Hydrogens on the left aswell as 2 oxygens.

Now go to the right side and put a 4 infront of CO2 and a 6 infront of H2O. You now have 4 carbons 12 hydrogens and 14 oxygens on the right side.

Finally go back to the let side and place a 7 infront to make the left have 14 oxygens just like in the right. A trick to use is to save the coefficients with only one element till the end so you can do less work in the long run.

But i hope this helped its balanced and down to the smallest whole numbers possible most teachers want whole numbers as the coefficient.

These are tricky at first but once you practice a bit you will be a pro.

Answer:

1.204 x 10²⁴ atoms of oxygen in 1 mole of CO₂

Explanation:

1 mole of CO₂ contains 6.02 x 10²³ molecules of CO₂

1 molecule of CO₂ contains 2 atoms of oxygen

Therefore, Atoms of oxygen in 1 mole of CO2 => 6.02 x 10²³ molecules CO₂  x

2 atoms oxygen / molecule CO₂ = 2  X  6.02 X10²³ atoms of oxygen = 1.204x10²⁴ atoms of oxygen in 1 mole CO₂

Answer:

a. 5.39 atm

Explanation:

Pressure = ?

Volume = 1 L

Temperature = 298 K

Mass = 9.70g

The formular relating these variables is the ideal gas equation;

PV = nRT

where R = gas constant = 0.082057 L.atm.K-1.mol-1

n can be obtained from the formular below;

n = mass / molar mass = 9.70 / 44

n = 0.2205 mol

P = nRT / V

P = 0.2205 * 0.082057 * 298 / 1

P = 5.392 atm

The correct option is option A.

Answer:

Flask d

Explanation:

I promise u it’s flask d

One reason could be that the compound prevented cells from mutating. The correct option is D.

Any drug that is effective in the treatment of malignant, or cancerous, disease is referred to as an anticancer drug.

Anticancer drugs are classified into several categories, including alkylating agents, antimetabolites, natural products, and hormones.

Chemotherapy, also known as chemotherapy or anticancer medication, is a type of medication used to destroy, kill, shrink, or slow the growth of cancer cells.

As after the treatment, the researchers noticed that the culture had stopped growing, it can be possible that it prevented new mutation.

Thus, the correct option is D.

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Your question seems incomplete, the missing options are:

A. The compound has degraded

B. The compound had no effect

C. The compound killed the treated cell

D. The compound prevented cells from mutating

Answer:

2.64g of CO₂ are produced

Explanation:

The reaction of hexane with O₂ is:

C₆H₁₄ + 19/2O₂ → 6CO₂ + 7H₂O

To solve this question, we must convert each mass of reactant to moles in order to find limiting reactant and, with the chemical reaction we can find the moles of carbon dioxide produced and the maximum mass produced:

Moles hexane -Molar mass: 86.18g/mol-:

0.862g * (1mol / 86.18g) = 0.01 moles

Moles Oxygen -Molar mass: 32g/mol-:

5.1g * (1mol / 32g) = 0.16 moles

For a complete reaction of 0.01 moles of hexane there are required:

0.01moles hexane * (19/2 Oxygen / 1mol Hexane) = 0.095 moles oxygen

As there are 0.16moles, limiting reactant is hexane.

0.01 moles of hexane produce:

0.01 moles * (6 moles carbon dioxide / 1 mole hexane) = 0.06 moles of CO₂.

The mass is -Molar mass CO₂: 44g/mol-:

0.06 moles of CO₂ * (44g/mol) =

The two factors for a successful reaction to occur are collisions between particles with the right orientation and sufficient energy (A and B).

The kinetic theory is a model explaining the movement (motion) of particles in a given substance.

In conclusion, the two factors for a successful reaction to occur are collisions between particles with the right orientation and sufficient energy (A and B).

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Answer:

The density of a substance is the relationship between the mass of the substance and how much space it takes up (volume). The mass of atoms, their size, and how they are arranged determine the density of a substance. Density equals the mass of the substance divided by its volume

The correct statement : The atomic number of the radioactive nuclide is 90.

In the following element notation,

[tex]\large {{{A} \atop {Z}} \right X}[/tex]

X = symbol of elemental atom

A = mass number

   = number of protons + number of neutrons

Z = atomic number

   = number of protons = number of electrons, on neutral elements

The symbol for a radioactive nuclide :

[tex]\tt ^{234}_{90}Th[/tex]

atomic number  = 90

mass number  = 234

number of neutrons = 234-90=144

number of protons = atomic number = 90

Answer:

A on EDG

Explanation: