Module 5 Exam / 5 A Science / Module 5: Sound and Light All changes saved


What affects how sound travels? (Select all that apply.)


wavelength


pressure


medium


temperature


PLEASE SELECT MORE THAN ONE IF YOU DO I WILL GIVE BRAINLY WHEN I GET THE CHANCE

Answer:

La comida es un sólido y no podemos vivir sin comida. Algunos sólidos son buenos conductores de calor y electricidad; otros son aislantes. Los sólidos se utilizan todos los días en la vida.

The given statement "When a scientific theory has been tested and proved by the scientific community, it becomes a law" is false because a scientific theory is a well-substantiated explanation of some aspect of the natural world that is based on empirical observation, testing, and experimentation.

It is a widely accepted explanation that has been repeatedly tested and validated by multiple researchers in the scientific community over time. A scientific theory is never conclusively proven, but it is constantly tested and modified as new evidence and data emerge over time. In other words, a scientific theory is a comprehensive explanation of an observed phenomenon that has not been disproven or invalidated by testing or experimentation.

A scientific law, on the other hand, is a concise statement that describes a fundamental principle of nature that has been consistently observed to be true in every observed instance. A scientific law is a mathematical statement that accurately predicts a natural phenomenon based on empirical observations and data. Scientific laws are also considered to be widely accepted, but unlike scientific theories, they do not attempt to explain the underlying mechanisms or causes of natural phenomena.

To summarize, a scientific theory and a scientific law are not the same thing. A scientific theory is an explanation of a natural phenomenon that has been tested and validated over time, while a scientific law is a concise statement that describes a fundamental principle of nature that has been consistently observed to be true.

Therefore, when a scientific theory has been tested and proved by the scientific community, it does not become a law, as they are two different concepts with different meanings.

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Based on the stoichiometry of the reaction, If the mass of sodium azide used was far greater than 1424 g, the volume of nitrogen gas produced will be far greater than 736 L.

However, If the mass of sodium azide used was far less than 1424 g, the volume of nitrogen gas produced will be far less than 736 L.

Sodium azide is the chemical found in automobile airbags.

Automotive air bags inflate when an electrical charge triggered by automobile impact causes sodium azide, NaN3, to rapidly decompose to its component elements, nitrogen gas and sodium

The equation of the reaction is given below:

According to the equation of reaction, 2 moles of sodium azide produces 3 moles of nitrogen gas.

1 mole of Nitrogen gas has a volume of 22.4 L

Molar mass of sodium azide is 65 g

Moles of sodium azide in 1424 g = 1424/65 = 21.9077 moles

21.9077 moles of sodium azide will produce 21.9077 * 3/2 moles of nitrogen gas = 32.86 moles of nitrogen gas

32.86 moles of nitrogen gas will occupy a volume of 32.86 * 22.4 = 736 L

If the mass of sodium azide used was far greater than 1424 g, the volume of nitrogen gas produced will be far greater than 736 L.

If the mass of sodium azide used was far less than 1424 g, the volume of nitrogen gas produced will be far less than 736 L.

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Answer: How do contrasting colors affect the quality of a painting

Answer:

The answer is D.

Explanation:

I just took the test. :)

Answer:

It's about mass of 40.1⋅g

Explanation:

I hope this helps you out. Have a nice day!

Total, 51.7 grams of magnesium hydroxide would be required to react with 558 mL of 3.18 M hydrochloric acid.

To solve this problem, we can use the balanced chemical equation for the reaction between magnesium hydroxide and hydrochloric acid:

Mg(OH)₂ + 2HCl → MgCl₂ + 2H₂O

From the balanced equation, we can see that one mole of Mg(OH)₂ reacts with two moles of HCl. We can use this information, along with the volume and concentration of the hydrochloric acid, to calculate the moles of HCl present;

moles of HCl = volume of HCl x concentration of HCl

moles of HCl = 0.558 L x 3.18 mol/L

moles of HCl = 1.77444 mol

Since the reaction is a 1:2 ratio of Mg(OH)₂ to HCl, we need half as many moles of Mg(OH)₂;

moles of Mg(OH)₂ = 1/2 x moles of HCl

moles of Mg(OH)₂

= 1/2 x 1.77444 mol

moles of Mg(OH)₂ = 0.88722 mol

Finally, we can use the molar mass of Mg(OH)₂ to convert moles to grams;

mass of Mg(OH)₂ =moles of Mg(OH)₂ x molar mass of Mg(OH)₂

mass of Mg(OH)₂ = 0.88722 mol x 58.33 g/mol

mass of Mg(OH)₂ = 51.7 g

Therefore, 51.7 grams of magnesium hydroxide would be required.

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Answer:

I found this in an article "There is frequently the odor of sulfur. This is due to a reaction between traces of iron in the yolk and sulfur in the white. It happens only when the eggs have been overcooked. Perfectly cooked yolks are moist and deep orange."

Explanation:

Hope that helps

A 30 volume hydrogen peroxide solution is commonly used in hair bleaching and it can lift the hair.

Hair can be lifted up to 150 levels using this solution.

The bleach used in hair bleaching consists of an alkalizing agent such as ammonia or sodium hydroxide and an oxidizing agent such as hydrogen peroxide.

The alkalizing agent increases the hair's pH, causing it to swell and soften.

The oxidizing agent, hydrogen peroxide, is used to break down the hair's natural color pigment.

Hydrogen peroxide is also used in hair dyeing where it opens the hair cuticle and allows the dye to penetrate the cortex.

Hair is colored by the oxidation of the dye molecules.

Peroxide reacts with hair to alter its melanin pigment, resulting in a new hair color.

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It will take approximately 35.4 years for both Cs-137 and Co-60 isotopes to decay until their activities are equal.

To determine the time it takes for both Cs-137 and Co-60 isotopes to decay until their activities are equal, we can use the decay function for each isotope and set them equal to each other.

The decay function for a radioactive isotope is given by:

A(t) = A₀ * exp(-λt)

Where:

A(t) is the activity at time t,

A₀ is the initial activity,

λ is the decay constant,

t is the time.

The decay constant (λ) can be calculated using the half-life (T₁/₂) of the isotope:

λ = ln(2) / T₁/₂

For Cs-137, the half-life is approximately 30.17 years, and for Co-60, the half-life is approximately 5.27 years.

Let's denote the time it takes for both activities to be equal as t_eq.

For Cs-137:

A(Cs-137) = 100 * exp(-0.693 / 30.17 * t_eq)

For Co-60:

A(Co-60) = 300 * exp(-0.693 / 5.27 * t_eq)

Setting the two equations equal to each other and solving for t_eq:

100 * exp(-0.693 / 30.17 * t_eq) = 300 * exp(-0.693 / 5.27 * t_eq)

Simplifying the equation:

1/3.0 * exp(-0.693 / 30.17 * t_eq) = exp(-0.693 / 5.27 * t_eq)

Taking the natural logarithm (ln) of both sides:

-0.693 / 30.17 * t_eq = -0.693 / 5.27 * t_eq

Solving for t_eq:

t_eq ≈ 35.4 years

It will take approximately 35.4 years for both Cs-137 and Co-60 isotopes to decay until their activities are equal. This calculation assumes that there is no other source of radiation or decay affecting the activities of the isotopes.

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Answer:

s

Explanation:

s

Answer:

Both reflect the kinetic energy of moving particles of matter. However, temperature is the average kinetic energy of particles of matter, whereas thermal energy is the total kinetic energy of particles of matter. ... Another factor also affects thermal energy. The other factor is mass

Explanation:

The dissolution of a molecular solute in a polar solvent typically results in an increase in entropy because both the molecules in the system and their energies are dispersed in a larger volume.

When a solute dissolves in a solvent, the individual molecules of the solute separate and become surrounded by solvent molecules. This disperses the solute molecules throughout the solution, resulting in an increase in the randomness or disorder of the system.

The increase in entropy is due to the fact that there are more ways to arrange the molecules in the solution than in the solute and solvent separately. As a result, the system becomes more disordered and the number of possible microstates increases, which leads to an increase in entropy.

This increase in entropy is also related to the concept of mixing. When a solute dissolves in a solvent, it is a form of mixing, and the mixing process tends to increase the entropy of the system.

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The relationship between acceleration due to gravity (g), mass of earth (M) and the radius of earth (R) is \(g = \frac{GM}{R^2} \).

The weight of an object is determined as the product of the object's mass and acceleration due to gravity.

F = mg

The gravitational force between two objects in the universe is directly proportional to the product of mass of the objects and inversely proportional to the square of the distance between the objects.

\(F = \frac{GmM}{R^2} \)

\(mg = \frac{GmM}{R^2} \\\\ g = \frac{GM}{R^2} \)

where;

M is the mass of the earth

R is the radius of the earth

Thus, the relationship between acceleration due to gravity (g), mass of earth (M) and the radius of earth (R) is \(g = \frac{GM}{R^2} \).

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Fluorine gas and water vapor react to form hydrogen fluoride gas and oxygen. The volume of hydrogen fluoride produced by a reaction if 3.05 ml of water were consumed is 6.10 ml.

The balanced reaction between fluorine gas and water vapor is

2F₂(g)+2H₂O(g)→4HF(g)+O₂(g)

To find out the volume of hydrogen fluoride produce, we need to use Avogadro's law equation which is given as

V₁/n₁=V₂/n₂

Where, V₁=3.05 ml, n₁=2, n₂=4, V₂=?

Rearrange the formula for V₂

V₂=(V₁×n₂/n₁)

Plug all the values in the formula

V₂=(3.05 ml×4/2)

V₂=12.2 ml/2

V₂=6.10 ml

Therefore, the volume of hydrogen fluoride(HF) produced by the reaction if 3.05 ml of water were consumed is 6.10 ml.

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Answer:

i think the answer is D)

but u should ask the another person too:)

In order to determine the pH in the given scenarios, several calculations and considerations need to be taken into account.Firstly, the Henderson-Hasselbalch equation can be used, which relates the pH of a solution to the pKa of the acid and the ratio of its conjugate base to the acid. This equation is pH = pKa + log([A-]/[HA]), where [A-] is the concentration of the conjugate base and [HA] is the concentration of the acid.

The first problem asks for the pH of a solution made by mixing 0.20 mol of acid HA with 0.30 mol of its conjugate base NaA. The pH can be calculated using the Henderson-Hasselbalch equation, pH = pKa + log([A-]/[HA]). Given that the pKa is 6, we can plug in the values and solve for the pH.

The second problem asks for the pH after adding 0.05 mol of NaOH to the previous solution. Since NaOH is a strong base, it will react with the acid HA and form water.

The amount of NaOH added is small compared to the amount of acid, so we can assume that the acid will be fully neutralized. We can calculate the resulting concentration of the acid and its conjugate base and use the Henderson-Hasselbalch equation to find the new pH.

The third problem involves mixing 200 mL of 0.20 M HA with 300 mL of 0.30 M NaA. We need to calculate the concentrations of the acid and its conjugate base after mixing, and then use the Henderson-Hasselbalch equation to find the pH.

The fourth problem asks for the pH after adding 10 mL of 0.50 M HCl to the previous solution. Since HCl is a strong acid, it will completely dissociate and increase the concentration of the acid HA.

We need to calculate the new concentrations of the acid and its conjugate base and use the Henderson-Hasselbalch equation to find the new pH.

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Answer:the plants received more sunlight

Explanation:

Answer:

ClxOy + H2 > HCl + H2O

HCl = 0.233/37 = 0.006 mol H2O = 0.403/180.02 mol

HCl = 0.006/0.022 H2O = 0.022/0.006

= 1 = 4

Cl2O4 + 5H2 > 2HCl + 4H2O

I'm think that's the answer

a) The theoretical yield of H2O is 16.25 grams.

b) The actual yield of H2O is 13.81 grams

First, balance the equation

C3H8 + SO2 → 3CO2 + 4H2O

a) To calculate the theoretical yield of H2O when starting with 10 grams of C3H8, we first need to determine the limiting reagent. This is the reactant that will be completely consumed in the reaction, thereby limiting the amount of product that can be formed.

The molar mass of C3H8 is 44.1 g/mol,

so 10 grams of C3H8 is equivalent to 10/44.1 = 0.226 moles of C3H8.

The molar mass of SO2 is 64.1 g/mol. We don't know how much SO2 we have, so we need to use stoichiometry to determine the amount required to react with 0.226 moles of C3H8.

From the balanced equation, we can see that the molar ratio of C3H8 to SO2 is 1:1.

Therefore, we need 0.226 moles of SO2 to react with 0.226 moles of C3H8.

The molar ratio of H2O to C3H8 is 4:1.

So if 0.226 moles of C3H8 react, we can expect to produce 4 times as many moles of H2O.

The molar mass of H2O is 18.0 g/mol, so the theoretical yield of H2O is:

0.226 mol C3H8 × 4 mol H2O/mol C3H8 × 18.0 g/mol H2O

= 16.25 g H2O

Therefore, the theoretical yield of H2O is 16.25 grams.

b) If the actual yield of H2O is 85% of the theoretical yield, then the actual amount of H2O produced is:

0.85 × 16.25 g = 13.81 g

Therefore, the actual yield of H2O is 13.81 grams.

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Answer:

Ice Cubes. When water freezes into ice cubes, the energy is released in the form of heat. ...

Formation Of Snow In Clouds. The process of snow formation is an exothermic reaction. ...

Hot Packs. ...

Rusting Of Iron. ...

Burning Of Candles. ...

Lightning Of Match. ...

Setting Cement And Concrete.

To calculate the amount of solute in a given solution, we need to know the concentration of the solute and the volume of the solution.

In the case of "D10/2NS Dextrose: NaCl," the notation indicates a solution containing both dextrose (sugar) and sodium chloride (salt) in specific concentrations. To determine the amount of solute, we need the concentration expressed as a percentage or a specific value. The given notation "D10/2NS" implies that the dextrose concentration is 10% and the sodium chloride concentration is 2%. However, it does not specify the volume of the solution. Please provide the volume of the solution in milliliters (mL) or the total grams (g) of the solute to proceed with the calculation accurately.

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Carbon and silicon have same number of valance electrons which is 4 electrons

Now, Barium is a 2nd group element. So, it has two valance electrons.

Silicon is a 16th group element and it has 4 valance electrons as does the carbon. This is because they both stay in the same group in the periodic table.

Neon is a noble gas which has 8 valance electrons and stays in the 18th group.

Therefore, carbon and silicon have same number of valance electrons which is 4 electrons.

The electrons in an atom's outermost shell, or energy level, are called valence electrons. For instance, the valence electrons of oxygen are six, with two in the 2s subshell and four in the 2p subshell.

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2NaCN(aq) + H2SO4(aq) 2HCN(g) + Na2SO4 is the reaction balanced equation (aq). The two reactants (NaCN and H2SO4) in this reaction exchange ions to create two new products (HCN and Na2SO4).

When sulphuric acid mixes with sodium carbonate, it goes through a double displacement reaction that creates sodium sulphate and carbonic acid.

The neutralisation reaction occurs when a strong acid combines with a strong base, producing a s2NaCN(aq) + H2SO4(aq) 2HCN(g) + Na2SO4 is the reaction's balanced equation (aq). The two reactants (NaCN and H2SO4) in this reaction exchange ions to create two new products (HCN and Na2SO4).

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(a) The speed of light in the unknown substance is determined 1.82 x 10⁸ m/s.

(b) The light will bend away from the normal since speed of light in air is not equal to speed of light in the substance.

The speed of light passing from air into the substance is calculated as follows;

refractive index = speed of light in air / speed of light in the substance

speed of light in the substance = speed of light in air/refractive index

speed of light in the substance = (3 x 10⁸) / (1.65)

speed of light in the substance = 1.82 x 10⁸ m/s

Thus, the light will bend away from the normal since speed of light in air is not equal to speed of light in the substance.

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Answer:

\(0.75\ \text{M}\)

Explanation:

\(C_1\) = Concentration of \(Na_2CO_3\)

\(C_2\) = Concentration of \(HCl\) = 1 M

\(V_1\) = Volume of \(Na_2CO_3\) = 20 mL

\(V_2\) = Volume of \(HCl\) = 15 mL

We have the relation

\(V_1C_1=V_2C_2\\\Rightarrow C_1=\dfrac{V_2C_2}{V_1}\\\Rightarrow C_1=\dfrac{15\times 1}{20}\\\Rightarrow C_1=0.75\ \text{M}\)

The concentration of \(Na_2CO_3\) is \(0.75\ \text{M}\).

..................................(0.<)................................

Answer a

acid-base

Answer b

oxidation-reduction: Na is oxidized, H+ is reduced

Answer c

oxidation-reduction: Mg is oxidized, Cl2 is reduced

Answer d

acid-base

Answer e

oxidation-reduction: P3− is oxidized, O2 is reduced

Answer f

acid-base

The molarity of a solution that was prepared by dissolving 82.0 g of calcium chloride in enough water to make 812 mL of solution is 0.91M.

Molarity is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution

The Molarity of a solution can be calculated using the following formula:

Molarity = no of moles ÷ volume

According to this question, a solution was prepared by dissolving 82.0 g of calcium chloride in enough water to make 812 mL of solution. The molarity can be calculated as follows:

no of moles of Calcium chloride = 82.0g ÷ 110.98 g/mol = 0.74 mol

Molarity = 0.74 ÷ 0.812 = 0.91M

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Explanation:

—COOH and —NH₂

Carboxylic Acid and Amino