Using the data collected from the experiment. Calculate the mass of the dried NaCI residue left in the crucible. Do not include the units( which is grams) MassEmpty crucible and cover 33.076Sodium carbonate 0.575PowderDried residue andcrucible and cover. 33.653

The wavelength of the sound in the solid medium, given that the speed of the sound in the solid is 15 times greater than that in air is 0.06 m

The wavelength of a wave is defined by the following formular:

Velocity (v) = wavelength (λ) × frequency (f)

v = λf

The following data were obtained from the question:

Velocity (v) = wavelength (λ) × frequency (f)

5160 = wavelength × 87000

Divide both sides by 87000

Wavelength = 5160 / 87000

Wavelength = 0.06 m

Therefore, we can conclude that the wavelength is 0.06 m

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Nothing can be inferred about  neutrons and electrons based on the results of the experiment.

The crux of the Rutherford experiment was the discovery of the planetary model of the atom. In his experiment, what he essentially did was to bombard a thin gold foil with alpha particles.

After the bombardment, he discovered that some of the alpha particles passed through the gold foil purely undeflected , some of the particles were deflected through large angles while yet some of  the alpha particles were bounced back.

On the basis of the observation, he opined that the atom has a central portion which contains a particle that is largely massive and caused the effects observed with the alpha particles. These results show nothing about the neutrons and electrons.

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The quotient of the given mathematical problem is equal to 2. Therefore, option A is correct.

In arithmetic, a quotient can be described as a quantity produced by the division of two numbers. The quotient has used throughout mathematics and is referred to as the integer part of a division or as a fraction or a ratio.

A rational number is the quotient of two integers when the denominator is non-zero.

A real number r is rational, it can be expressed as a quotient of two integers with a non-zero denominator.

Given a real number r, r is rational if and only if there exist integers a and b such that\({\displaystyle r={\tfrac {a}{b}}}, {\displaystyle b\neq 0}\)

Given, the division of √100/√25

We can write the \(\sqrt{100} =\sqrt{25\times 4} =\sqrt{25} \sqrt{4}\)

Now, \(\displaystyle \frac{\sqrt{100}}{\sqrt{25}}= \frac {\sqrt{25}\times \sqrt{4} }{ \sqrt{25}} =\sqrt{4} =2\)

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Answer:

A small amount of chemical splashes in Frank's eye. What should happen next? Frank should go to the eyewash station while his lab partner tells the teacher what happened.

Explanation:

Brainlist

Answer: Compaction and Cementation.

Explanation. Compaction occurs when the weight of overlying sediment compresses the sediment grains and reduces the amount of pore space between them, resulting in a more tightly packed sedimentary rock. Cementation occurs when mineral-rich groundwater moves through the pore spaces of the sediment, depositing minerals that bind the sediment grains together and form a solid rock.

Answer:

He or She used the wrong table of bond energies

Explanation:

We know that we obtain the energy of a reaction also known as the enthalpy of reaction from the formula; ΔHo(reaction) = sum of the bond energies of bonds being broken - sum of the bond energies of the bonds being formed.

Combustion is an exothermic reaction for which the value of ΔH is expected to the negative. If ΔH is not negative, then the calculation was not properly done and the wrong values of bond energy were probably used.

Answer:

He or she may have subtracted the bond energies for the reactants from the products.

Explanation:

The valves that are closed in the isovolumetric phase of the cardiac cycle are :  semilunar valves (pulmonary valves, aortic valves) and AV valves.

During the isovolumetric phase of cardiac cycle, the ventricles of heart are contracting and building pressure, but atrioventricular (AV) valves (mitral and tricuspid valves) and semilunar valves (aortic and pulmonary valves) are both closed. This implies that blood is not flowing into or out of ventricles during this phase.

The closure of valves prevents backflow of blood and allows ventricles to generate enough pressure to open semilunar valves and eject blood into the arteries during subsequent ejection phase of cardiac cycle.

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Note: The question given on the portal is incomplete. Here is the complete question.

Question: Select all that apply the valves are closed in the isovolumetric phase of the cardiac cycle.

AV valves

semilunar valve

aortic valve

mitral valve

This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97. The incorrect representation for a neutral atom is 36Li

To determine the correct representation for a neutral atom, we need to consider the atomic number (Z) and mass number (A) of the element. The atomic number represents the number of protons in the nucleus, while the mass number represents the sum of protons and neutrons.

Let's analyze the given representations:

36Li:

This representation suggests that the element is lithium (Li) with a mass number of 36, which is incorrect. The correct mass number for lithium is approximately 6.94.

613C:

This representation suggests that the element is carbon (C) with a mass number of 13, which is correct. Carbon has different isotopes, and 13C represents one of its stable isotopes.

3063Cu:

This representation suggests that the element is copper (Cu) with a mass number of 63, which is correct. Copper has different isotopes, and 63Cu represents one of its stable isotopes.

1530P:

This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97.

Therefore, the incorrect representation for a neutral atom is 36Li, as it does not match the known properties of lithium.

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Answer:

moles reactant = 2, moles of products = 3

Explanation:

The reactants are on the left side of the equation. Although, energy (heat) is a reactant it will not factor into the calculation for moles. The coefficient is the number of moles for each substances. So for the reactant side NO would have 2 moles because the coefficient is 2. Using the same logic, NO on the product side will have 2 moles and O2 will be 1 mole. O2 has one mole because it is implied that you know anything multipled by one is the same number. So 1 mole of O2 is written as O2 and not 1 O2.

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At equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

1: Write the balanced chemical equation:

\(C_O\)(g) + \(Cl_2\)(g) ⟶ \(C_OCl_2\)(g)

2: Set up an ICE table to track the changes in moles of the substances involved in the reaction.

Initial:

\(C_O\)(g) = 0.3500 mol

\(Cl_2\)(g) = 0.05500 mol

\(C_OCl_2\)(g) = 0 mol

Change:

\(C_O\)(g) = -x

\(Cl_2\)(g) = -x

\(C_OCl_2\)(g) = +x

Equilibrium:

\(C_O\)(g) = 0.3500 - x mol

\(Cl_2\)(g) = 0.05500 - x mol

\(C_OCl_2\)(g) = x mol

3: Write the expression for the equilibrium constant (Kc) using the concentrations of the species involved:

Kc = [\(C_OCl_2\)(g)] / [\(C_O\)(g)] * [\(Cl_2\)(g)]

4: Substitute the given equilibrium constant (Kc) value into the expression:

1.2 x \(10^3\) = x / (0.3500 - x) * (0.05500 - x)

5: Solve the equation for x. Rearrange the equation to obtain a quadratic equation:

1.2 x \(10^3\) * (0.3500 - x) * (0.05500 - x) = x

6: Simplify and solve the quadratic equation. This can be done by multiplying out the terms, rearranging the equation to standard quadratic form, and then using the quadratic formula.

7: After solving the quadratic equation, you will find two possible values for x. However, since the number of moles cannot be negative, we discard the negative solution.

8: The positive value of x represents the number of moles of \(Cl_2\)(g) at equilibrium. Substitute the value of x into the expression for \(Cl_2\)(g):

\(Cl_2\)(g) = 0.05500 - x

9: Calculate the value of \(Cl_2\)(g) at equilibrium:

\(Cl_2\)(g) = 0.05500 - x

\(Cl_2\)(g) = 0.05500 - (positive value of x)

10: Calculate the final value of \(Cl_2\) (g) at equilibrium to get the answer.

Therefore, at equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

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Answer:

λ [Wavelength] = 3.04357825 m [meters]

Explanation:

Given a frequency, to find the wavelength, divide the speed of light by the frequency. Wavelength = Speed Of Light In Seconds / Frequency .

Wavelength in meters is: λ = 299,792,458 m/s / f Hz .

Then substitute in the frequency to find the wavelength: λ = 299,792,458 m/s / f Hz → λ = 299,792,458 m/s / 9.85 × 10^7 Hz → λ = 2.99792458 × 10^8 m/s / 9.85 × 10^7 → λ = 2.99792458 × 10^8 m / 9.85 × 10^7 → λ = 29.9792458 / 9.85 m → λ = 3.04357825 m

Answer:

C: 40.

Explanation:

To answer this question, we need to use the concept of heat transfer and the law of conservation of energy, which states that energy cannot be created or destroyed, only transferred or transformed from one form to another.

When two substances are in contact, heat can flow from one substance to another until they reach thermal equilibrium (i.e., they have the same temperature). In this case, Substance 1 loses 40 calories of heat, which means it gives off 40 calories of heat to Substance 2. Therefore, Substance 2 will gain 40 calories of heat to reach thermal equilibrium.

Therefore, the correct answer is option C: 40.

Answer:

Freeze

Condense

Melt

Sublime

Explanation:

Answer:

Exothermic reaction!

Explanation:

Exo -> Releases Heat

Endo -> Absorbs Heat

b. testing the hypothesis

Answer:

Mg S2 O3

Explanation:

.691 g of Mg  is .284 mole

1.84 g of S    is .5739 mole

1.365 g of O is  .8531 mole      you can see the ratio is ~  1 :2 :3

                                                        Mg S2 O3

The molarity of the solution is 0.211 M.

The molarity (M) of a solution is given by the formula:

M = moles of solute / liters of solution

To find the moles of copper (II) sulfate (CuSO4), we first need to calculate its molecular weight:

CuSO4 = 63.55 + 32.06 + (4 × 16.00) = 159.61 g/mol

Now we can find the number of moles of CuSO4:

moles = mass / molecular weight = 50.5 g / 159.61 g/mol = 0.316 moles

Finally, we can use the definition of molarity to find the molarity of the solution:

M = moles / liters = 0.316 moles / 1.5 liters = 0.211 M

Therefore, the molarity of the solution is 0.211 M.

What is molarity?

Molarity is a measure of the concentration of a solution, defined as the number of moles of solute dissolved per liter of solution. It is represented by the symbol M and has units of moles per liter (mol/L). The molarity of a solution is an important parameter in many chemical reactions and is used in various calculations such as dilution, stoichiometry, and titration.

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Hail is most commonly formed within the cumulonimbus clouds of thunderstorms. Large updrafts of air can throw rain droplets high up into the tops of the cloud.

What is a thunderstorm?

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Answer:

Explanation:

Hope this helps good day

Answer:

3 Covalent Bonds and 1 Co ordinate Bond

Explanation:

4 bonds are in NH4¹+

NH4¹+ is the ammonium ion, which consists of a central nitrogen atom (N) and four hydrogen atoms (H). Nitrogen is located in group 15 of the periodic table and has 5 valence electrons. Hydrogen, on the other hand, has 1 valence electron.

To achieve a stable electron configuration, nitrogen needs to share electrons with the hydrogen atoms. Each hydrogen atom can form a single bond with the nitrogen atom by sharing its valence electron.

In NH4¹+, all four hydrogen atoms form single bonds with the central nitrogen atom. These bonds are represented by lines connecting each hydrogen atom to the nitrogen atom.

So, NH4¹+ has 4 bonds. Each bond represents a pair of electrons shared between the nitrogen atom and a hydrogen atom. The bonding arrangement ensures that the nitrogen atom has a complete octet (eight valence electrons) and each hydrogen atom has two electrons, following the stable configuration of helium.

The "+1" charge on NH4¹+ indicates that the ion has lost one electron, resulting in a positive charge. However, the number of bonds remains the same regardless of the charge.

Therefore, the correct answer is 4 for the number of bonds in NH4¹+.

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Answer:buckled railroad tracks on a hot day

Explanation: i just did it

Answer:

Antoine Henri Becquerel was studying phosphorescence when he discoverd radio activeity.

Explanation:

Answer:

A but I'm not sure

Explanation:

Answer:

100.052 degrees C

Explanation:

It has been experimentally proven that the addition of solute to water will result in boiling point elevation due to the presence of more molecules. The boiling point elevation refers to the tendency of a solvent's boiling point to increase when an impurity (a solute) is added.

The formula of boiling point elevation is

\(\Delta T_{b} \ = \ K_{b} \times m\), where m is the molality defined as the number of moles of solute per kilograms of solvent and \(K_{b}\) is the molal boiling point elevation constant.

Given that the molal boiling point elevation constant of water is 0.512 \(^{\circ}\mathrm{C}{m}^{-1}\),

\(\Delta T_{b} \ = 0.512 \ ^{\circ}\mathrm{C}m^{-1} \times \displaystyle\frac{14.2 \ \mathrm{g}}{213 \ \mathrm{g \ mol^{-1} \ \times \ 0.655 \ kg \ (H_{2}O)}} \\ \\ \Delta T_{b} \ = \ 0.052 \ ^{\circ}\mathrm{C}\)

To evaluate the boiling point of the aluminium nitrate solution,

\(T_{b} \ (\mathrm{solution}) \ = \ T_{b} (\mathrm{H_{2}O}) \ + \ \Delta T_{b} \\ \\ \-\hspace{2.06cm} = \ 100^{\circ}\mathrm{C} \ + \ 0.052^{\circ}\mathrm{C} \\ \\ \-\hspace{2.06cm} = 100.052^{\circ}\mathrm{C}\)

Answer:

No it is not balanced

Explanation:

CaCl2 + 2NaHCO3 → CO2 + CaCO3 + H2O + 2NaCl

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The acceleration of the car is -2.3m/s².

Acceleration is the rate at which the direction and speed of motion change over time. It is said to have been accelerated when something changes its direction and moves faster or slower. Motion on a circle accelerates even when the speed is constant because the direction is constantly changing.

Velocity is the rate at which displacement changes. The rate at which speed changes is known as acceleration. Because it consists of both magnitude and direction, velocity is a vector quantity. Since acceleration is merely the rate at which velocity changes, it too is a vector quantity.

v = u +at

0 = 35 + a×15

15a = -35

a = -35/15

a = -2.3m/s².

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Answer:

B. -2.3 m/s²

Explanation:

To answer this question, we have to use the following formula:
\(\boxed{a = \frac{v - u}{t}}\),

where:

• a ⇒ acceleration

• v ⇒ final velocity

• u ⇒ initial velocity

• t ⇒ time taken for the change in velocity to occur

From the question, we know that initially, the car was travelling at 35 km/h. Therefore, u = 35 km/h. The question also tells us that the car comes to a full stop, meaning its final velocity is 0 m/s. Therefore, v = 0 km/h. It takes the car 15 seconds to stop, so t = 15 s.

Using the information above and substituting it into the formula, we can calculate the acceleration of the car:

\(a = \frac{0 - 35}{15}\)

  = -2.3 m/s²

Therefore, the acceleration of the car is -2.3 m/s², and the correct answer is B.

Answer: 27.85 L

Explanation:

Ideal gas law

V = nRT/P

V = 1.07 X 0.0821 X 317 / 1=  27.85 L

Biotechnology is the use of living organisms or other biological systems in the manufacture of drugs or other products or for environmental management, as in waste recycling: includes the use of bioreactors in manufacturing, microorganisms to degrade oil slicks or organic waste, genetically engineered bacteria to produce human hormones, and monoclonal antibodies to identify antigens.

Biotech offers the possibility of improving human health, the environment, and agriculture while creating more sustainable modes of production.

There are 90.0 g of F are present in 185 g of CaF₂. In chemistry, a mole, usually spelled mol, is a common scientific measurement unit for significant amounts of extremely small objects like atoms, molecules, or other predetermined particles.

According to question, mass of CaF₂ = 185 g

It is required to calculate the moles of CaF₂

Moles of CaF₂ = 185 g / 78.074 g.mol-1

= 2.369 mole of CaF₂

Now find the moles of F from the moles of CaF₂

1 mole of CaF₂ = 2 moles of F

2.369 mole of CaF₂ = ?

= 4.74 moles of F

Now change the mole to gram of F

Mass of F = 4.74 moles of F × 18.998 g/mol

= 90.03 g of F

Thus, 90.0 g of F are in 185 g of CaF₂.

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In order to calculate this question, we will use the reaction quotient Q, which has a very similar formula as the equilibrium formula, but this Q can be calculated not just in equilibrium (where Q = K) but in any part of the reaction, so K is the equilibrium, and Q is what is used to see where the reaction will shift towards until it reaches equilibrium, we can have three possible outcomes:

Q = K, the reaction is already in equilibrium

Q > K, the reaction will proceed in the reverse direction

Q < K, the reaction will proceed in the forward direction

Let's set up the formula:

Q = [products]/[reactants], the brackets mean Concentration of each compound. Now adding our compounds

Q = [BrCl]^2/[Br2]*[Cl2], the BrCl is raised to 2 because we have 2 BrCl in the reaction, this is a rule for the equilibrium formula, we use the coefficient in front of the compound and raise its concentration to this number

Now we need the concentration of each compound, to find it we will use the Molarity formula

M = n/V

M = 0.15/2

M = 0.075M, notice that since we have the same number of moles and volume for every compound, we will have the same concentration for every compound, going back to our formula

Q = [0.075]^2/[0.075][0.075]

Q = 1.0

Since K = 7.0 and Q = 1.0

K > Q, the reaction will proceed in the forward direction in order to increase the concentration of 2 BrCl in order to finally reach Q=K

Answer:

Molar mass of bromine is equal to \(80.9119\)

Explanation:

The molar mass of HBr is equal to the sum of atomic weight of  Bromine.

Atomic Weight of hydrogen is equal to \(1.00794\)

Atomic Weight  of Bromine is equal to \(79.904\)

Molar mass of Bromine

= Atomic Weight of hydrogen + Atomic Weight  of Bromine

Molar mass of Bromine  \(= 79.904 + 1.00794 = 80.9119\)