Which statements are true about white light? (Select all that apply.)

PLEASE SELECT MORE THAN ONE IM BEGGING YOU

White light is when no colors are absorbed by the object.

White light is when all colors are absorbed by the object.

White light is when all colors are reflected off of the object’s surface.

White light is when no colors are reflected off of the object’s surface.

Answer:

A) Spectroscopes

Explanation:

Spectroscopes collects the light from distant stars and separate that light into bands of different colors; by studying these bands, astronomers identify the elements in a star.

The reaction has not yet started, and the time required for 16.8% of the reactant to remain cannot be calculated using the given rate constant.

Given,The rate constant for this first-order reaction is 0.0830 s−1 at 400 ∘C.A⟶products After how many seconds will 16.8% of the reactant remain-The time taken for a first-order reaction to reach a particular percentage of completion can be calculated using the following formula:t = (ln(A/A₀))/kwhere A₀ is the initial concentration of the reactant, A is the concentration of the reactant at a given time, k is the rate constant, and t is the time elapsed since the reaction began.In this question, we are given the rate constant, k = 0.0830 s−1 at 400 ∘C, and we want to find out the time required for 16.8% of the reactant to remain.Let's assume that the initial concentration of the reactant is 100 units (we can assume any value as it does not affect the percentage of completion).Therefore, the concentration of the reactant remaining after 16.8% of completion would be: A = 16.8 units.Substituting these values in the above formula, we get:t = (ln(16.8/100))/0.0830t = (−1.7918)/0.0830t = −21.58 sThis time value is negative, which means that the reaction has not even started yet. Therefore, we need to check the given percentage of completion.

If it is less than 50%, we can assume that the reaction has not yet started. In this case, the percentage of completion is 16.8%, which is less than 50%.

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Answer:

NaCl + AgF → NaF + AgCl

Explanation:

A double replacement reaction is a type of chemical reaction that occurs when two reactants exchange cations or anions to yield two new products.

From all the reactions given ,

Electronegativity on the periodic table typically rises from left to right across a period and falls as you move down a group. Hence, the right response is (B).

Electronegativity rises over time and falls over a group. Because the valence shells of the atoms (metals) at the left of the table are less than halfway full, they tend to lose electrons and have poor electronegativity.

Atoms become more electronegativity as you move from left to right throughout a period. Atoms have a larger nuclear charge and a smaller covalent radius as you progress across the periodic table from left to right.

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Answer: 28

Explanation:

mechanial energy is the sum of potential and kinetic energy

If copper is lost during the decanting step, the specific consequence is that the mole ratio of iron to copper will increase.

Let's consider a scenario where we have a mixture of iron and copper. Initially, the mole ratio of iron to copper is determined by the amounts of iron and copper present in the mixture. For example, if we have 1 mole of iron and 1 mole of copper, the initial mole ratio is 1:1.

During the decanting step, if copper is lost, the amount of copper in the mixture decreases. However, the amount of iron remains the same. This leads to a change in the mole ratio between iron and copper.

Since the mole ratio is calculated by dividing the number of moles of iron by the number of moles of copper, if the denominator (number of moles of copper) decreases while the numerator (number of moles of iron) stays the same, the mole ratio will increase.

As a result, the mole ratio of iron to copper will be higher than the initial ratio. In other words, there will be a greater proportion of iron relative to copper in the remaining mixture after the loss of copper during the decanting step.

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If copper is lost during the decanting step, the specific consequence is that the mole ratio of iron to copper will increase.

Let's consider a scenario where we have a mixture of iron and copper. Initially, the mole ratio of iron to copper is determined by the amounts of iron and copper present in the mixture. For example, if we have 1 mole of iron and 1 mole of copper, the initial mole ratio is 1:1.

During the decanting step, if copper is lost, the amount of copper in the mixture decreases. However, the amount of iron remains the same. This leads to a change in the mole ratio between iron and copper.

Since the mole ratio is calculated by dividing the number of moles of iron by the number of moles of copper, if the denominator (number of moles of copper) decreases while the numerator (number of moles of iron) stays the same, the mole ratio will increase.

As a result, the mole ratio of iron to copper will be higher than the initial ratio. In other words, there will be a greater proportion of iron relative to copper in the remaining mixture after the loss of copper during the decanting step.

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\(^{85}_{37}Rb\) has 37 electrons in the orbit about its nucleus.

Atomic mass is the total number of neutrons and protons present in the nucleus of an element.

The atomic number is the total number of protons present in the nucleus of an element.

For writing an atomic symbol, atomic mass is written on the top left of the atomic symbol, and the atomic number is written on the downside of the left of the symbol.

\(^{Atomic mass}_{Atomic number}X\)

An electrically neutral atom is an atom that has an equal number of electrons as well as protons.

Thus from the above conclusion we can say that  \(^{85}_{37}Rb\) has 37 electrons.

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Answer:

\(ClO^-\\\\Sr^{2+}\)

Explanation:

Hello there!

In this case, according to the reaction between hypochlorous acid and strontium hydroxide which yields stontium hypochlorite and water as a neutralization reaction:

\(2HClO(aq)+Sr(OH)_2(aq)\rightarrow Sr(ClO)_2(aq)+2H_2O(l)\)

Thus, since HClO is a weak acid, it is not fully ionized so the complete ionic equation turns out to be:

\(2H^++2ClO^-+Sr^{2+}+2(OH)^-\rightarrow Sr^{2+}+2(ClO)^-+2H_2O(l)\)

Whereas the spectator ions, which remain the same at both sides of the equation, are:

\(ClO^-\\\\Sr^{2+}\)

Best regards!

Answer:

The reactant that produces a lesser amount of product is the limiting reagent. The reactant that produces a larger amount of product is the excess reagent. To find the amount of remaining excess reactant, subtract the mass of excess reagent consumed from the total mass of excess reagent given.

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Answer: The percent yield of zinc carbonate is 5.91 %

Explanation:

To calculate the moles :

\(\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}\)

 \(\text{Moles of} ZnCO_3=\frac{12.6 g}{125.4g/mol}=0.100moles\)

\(ZnI_2\) is the limiting reagent as it limits the formation of product and \(Na_2CO_3\) is the excess reagent.  

\(Na_2CO_3+ZnI_2\rightarrow 2NaI+ZnCO_3\)  

According to stoichiometry :

1 mole of produce =  1 mole of

Thus 1.7 moles of \(ZnI_2\) will produce=\(\frac{1}{1}\times 1.7=1.7moles\)  of \(ZnCO_3\)

Theoretical yield of \(ZnCO_3=moles\times {\text {Molar mass}}=1.7moles\times 125.4g/mol=213.2g\)

percentage yield = \(\frac{\text {Experimental yield}}{\text {Theoretical yield}}\times 100=\frac{12.6g}{213.2g}\times 100=5.91\%\)

Answer:

the other person was right EXCEPT it says in 2 significant numbers so the answer is 5.9

Explanation:

i hope this helps. have a wonderful day :))

Answer:

Increase the pressure of the gas

Explanation:

According to the Pressure law, for a fixed mass of gas, at a constant volume (V), the pressure (P) is directly proportional to the absolute temperature (T).

From the kinetic molecular theory, gases are composed of particles which are in constant motion, colliding with themselves as well as with the walls of their container.

When the temperature of these gas molecules is increased, the molecules acquire more kinetic energy and the rate of collisions increases. Since the container cannot expand, the increase in pressure is due to the increase in collisions between the molecules of the gas as well as with the walls of their container.

Answer:

False

Explanation:

Its F

The man can survive in the elevator for approximately 4.34 minutes.

Surface area of a man = 1.7 m^2

Dimensions of elevator = 1 m x 1 m x 2 m

Heat released from Oxygen is 4.83 kcal/litre.

We know that the man needs oxygen to survive. Oxygen makes 20% of air and heat released from Oxygen is 4.83 kcal/litre.Let the volume of the elevator be V = 1 m x 1 m x 2 m = 2 m^3. The volume of air in the elevator will also be 2 m^3.To calculate the volume of oxygen in the air, we need to multiply the volume of air by the percentage of oxygen in the air.20% of 2 m^3 = 0.4 m^3

This is the volume of oxygen in the air. To calculate the mass of oxygen in the air, we need to multiply the volume of oxygen by the density of oxygen.The density of oxygen is 1.429 kg/m^3.Mass of oxygen in the air = Density x Volume= 1.429 kg/m^3 x 0.4 m^3= 0.5716 kg

This is the mass of oxygen available in the elevator for the man to breathe.We know that the man uses oxygen to breathe and releases heat in the process. The heat released from Oxygen is 4.83 kcal/litre. The man needs 5 litres of Oxygen per minute to survive.

Therefore, he will release 4.83 x 5 = 24.15 kcal of heat per minute.To calculate the time the man can survive in the elevator, we need to calculate the total heat in the elevator. The specific heat capacity of air is 1.005 kJ/kg K (or 0.24 kcal/kg K).Therefore, the heat capacity of air in the elevator = mass of air x specific heat capacity x change in temperature= 1.2 kg x 0.24 kcal/kg K x (35°C - 25°C)= 2.88 kcal/°C

The initial temperature of the air is 25°C and the final temperature is 35°C. The total heat in the elevator can be calculated as follows:Total heat = Heat capacity x Change in temperature x mass of air= 2.88 kcal/°C x 10°C x 1.2 kg= 34.56 kcal

Therefore, the man can survive in the elevator for:

Time = Total heat released by man/Total heat in the elevator= 150/34.56= 4.34 minutes (approx)

The man can survive in the elevator for approximately 4.34 minutes.

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Answer:

0.84kg of gatorade powder

Explanation:

From the question given, we were told that 0.6kg of gatorade powder required 5 gallons of water.

To obtain the mass of gatorade needed for 7 gallons of water, we simply do the following:

0.6kg of gatorade powder required 5 gallons of water.

Therefore, xkg of gatorade powder will require 7 gallons of water i.e

xkg of gatorade powder = (0.6 x 7)/5

xkg of gatorade powder = 0.84kg

Therefore, 0.84kg of gatorade powder will be required.

According to the given question  the density of Iron is 7.84 g/mL

Given data:

Mass of Iron = 9.8 g

Initial volume of water = 29.30 mL

Final volume of Iron and water = 30.55 mL

We can use the formula of density, which is:

Density = mass/volume

To calculate the density of iron, we need to first calculate the volume of Iron. We can do this using the equation of the total volume of Iron and water.

Volume of Iron = Final Volume - Initial Volume of water

Volume of Iron = 30.55 mL - 29.30 mL

Volume of Iron = 1.25 mL

Now, we can substitute the values of mass and volume into the formula of density:

Density of Iron = mass/volume

Density of Iron = 9.8 g / 1.25 mL

Density of Iron = 7.84 g/mL

Thus, the density of Iron is 7.84 g/mL (rounded off to two significant figures).

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Explanation:

hope it make sense to u :)

All the substituents direct the incoming group to the meta position during electrophilic aromatic substitution. The correct answer is option E. all of these.

Aromatic compounds undergo substitution reactions rather than addition reactions because of their high stability. Electrophilic Aromatic Substitution is one of the most important substitution reactions of an aromatic ring. A reaction in which the hydrogen atom of an aromatic ring is substituted by an electrophile (a positively charged species) is known as electrophilic aromatic substitution. It occurs by the following mechanism:

Electrophile Attack → Formation of Sigma Complex → Formation of Aromatic Compound

Among the given substituents, all of them -NO\(_2\), -CN, -CCl\(_3\), -COOH directs the incoming group to the meta position during electrophilic aromatic substitution.

Therefore, the correct option is E, all of these.

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Answer:

If an object is moving at a constant speed in a constant rightward direction, then the acceleration is zero and the net force must be zero.

According to Aristotle, a force is anything that causes an item to move "unnaturally." One of the first scientists to explore force and gravity was Sir Isaac Newton. A push or a pull is all that constitutes a force. It might be compared to pushing or pulling on an object.

An object's push or pull is seen as exerting a force. The interaction of the objects produces push and pull. You can also use words like stretch and squeeze to describe force.The definition of force in physics is. The push or pull on a mass-containing item changes its velocity.

An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude. The application of force is the location at which force is applied, and the direction in which the force is applied is known as the direction of the force.

The net force is:

Fnet = Fr - Fl = 10 - 8 = 2N

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Answer:

Which statement explains the kinetic theory of heat?

A)Objects whose particles are at the same temperature are in thermal equilibrium.

B) Objects are made of tiny particles, and their motion depends on the temperature.

C) Heat is transferred as thermal energy by the interaction of moving particles.

D) An object's thermal energy is caused by the movement of the tiny particles that it is made of.  

YOU ANSWER IS (C) "heat is transferred as thermal energy by the interaction of moving particles"

Explanation: I TOOK THE K12 TEST ENJOY !!!!

Answer:

Heat is transferred as thermal energy by the interaction of moving particles.

Explanation:

I took the test

The statement "Steady flow devices that result in a drop in working fluid pressure from inlet to exit are: Nozzle, turbine, and throttling device" is TRUE.

1. Nozzle: A nozzle is a device that accelerates the flow of a fluid, causing the pressure to decrease from the inlet to the exit.
2. Turbine: A turbine is a device that extracts energy from a fluid, causing the pressure to drop from the inlet to the exit as the fluid does work on the turbine.
3. Throttling device: A throttling device is a device that restricts the flow of a fluid, causing the pressure to decrease from the inlet to the exit.

All three devices result in a drop in working fluid pressure from the inlet to the exit, making the statement true.

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True. Steady flow devices such as nozzles, turbines, and throttling devices result in a drop in working fluid pressure from inlet to exit.

Steady flow devices are those that operate under steady-state conditions, meaning that the flow rate of the working fluid through the device remains constant. In these devices, the pressure of the working fluid can change as it moves through the device due to various factors such as changes in velocity or cross-sectional area.

Nozzles are devices that are designed to increase the velocity of a fluid while reducing its pressure. They are often used in propulsion systems, where a high-velocity exhaust stream is required to generate thrust.

Turbines, on the other hand, are devices that convert the kinetic energy of a moving fluid into mechanical energy. As the fluid flows through the turbine, it causes the blades to rotate, which can be used to drive a generator or other machinery.

Throttling devices are those that restrict the flow of a fluid, causing a drop in pressure. Examples of throttling devices include valves and restrictions in piping systems.

Therefore, all of these devices result in a drop in working fluid pressure from inlet to exit, making the statement true.

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The question is incomplete, the complete question is;

Rico is doing an experiment. He makes a solution of calcium carbonate in a beaker of 200 mL of water at room temperature (25 °C). He adds a small amount of lemon juice to the solution and a chemical reaction begins. Rico reduces the temperature of the solution by 10 °C by adding ice. As the solution cools, what will happen to the chemical reaction?  

A. The chemical reaction will stop suddenly.

B. There will be no change in the rate of the chemical reaction.

C. The chemical reaction will slow as the water cools.

D. The speed of the chemical reaction will increase as the water cools.

Answer:

C. The chemical reaction will slow as the water cools.

Explanation:

The rate of a chemical reaction is dependent on the temperature of the reaction system. This derives directly from the collision theory of chemical reaction.

The higher the temperature of the system, the more frequently the particles collide and the faster the rate of reaction.

As the temperature is decreased, the rate of reaction decreases simultaneously. Therefore, as Rico decreases the temperature from 25 degrees to 10 degrees, the rate of reaction decreases accordingly.

Answer:

9.90

Explanation:

Given [H+] = 1.25 x 10^-10 M, we can calculate the pH using the formula:

pH = -log10([H+])

pH = -log10(1.25 x 10^-10)

Using logarithmic properties:

pH = -log10(1.25) - log10(10^-10)

Since log10(10^-10) is equal to -10:

pH = -log10(1.25) - (-10)

pH = -log10(1.25) + 10

Now, evaluating the logarithm using a calculator:

pH = -0.0969 + 10

pH = 9.9031

Therefore, the pH of the solution with [H+] = 1.25 x 10^-10 M is approximately 9.9031. Rounding it to two decimal places, the pH is approximately 9.90.

In reaction 4 on page 76, NH4Cl cannot be analyzed gravimetrically because it is soluble in aqueous solution. Option D.

Gravimetric analysis involves precipitating a substance out of solution and measuring its mass, but since NH4Cl dissolves in water, it cannot be effectively isolated for measurement. In contrast, an inert substance would not react or dissolve in the solution, making it suitable for gravimetric analysis. Additionally, the stability or solubility of NH4Cl does not affect its ability to be analyzed gravimetrically, as long as it is not soluble in the solvent used for precipitation. Therefore, the correct answer is D.

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The molarity of the calcium ions is 2.2 M

The molarity of the chloride ions is 1.1 M

Molarity is a unit of concentration that is defined as the number of moles of solute per liter of solution. It is typically denoted by the symbol "M".

We know that calcium chloride solution has a molarity of 2.2 M and contains calcium ions and chloride ions.

Molarity of calcium ions = 2.2 M

Molarity of the chloride ions = 1/2 * 2.2 = 1.1 M

These are the molarities of the ions that are in the solution.

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Answer:

Knowing chemistry can help you make decisions

Answer:

1 ) chemistry plays a role in the manufacturing of medicines

2 ) chemistry plays a role in the production of cosmetics

3 ) chemistry plays a role in the production of soaps and detergents

4 ) chemistry is used to manufacture construction materials

5 ) chemistry allows us to use fuels

6 ) chemistry is important in agriculture ( providing fertilizers ... )

7 ) chemistry is important in textiles

Answer:

Compare the properties of metals, nonmetals, and metalloids. Metals are shiny, are good conductors of heat and electric current, and are malleable and ductile. Nonmetals are dull, are poor conductors of heat and electric current, and tend to be brittle. basically, It's A.

Explanation: if it's not "A" then you can blame me cuz i, myself, am gonna be honest, don't know the answer, but what i read, shows me, that it's A.