What are some ways that use physics in your everyday life?

Answer:

2.1×6.02×1023÷ 14

9.03×1022 atom of nitrogen

Explanation:

Answer:

Hydrochloric acid + sodium → sodium chloride + water

NaOH +HCl → H2O and NaCl

Explanation:

salt is a neutral ionic compound. Let's see how a neutralization reaction produces both water and a salt, using as an example the reaction between solutions of hydrochloric acid and sodium hydroxide. The overall equation for this reaction is: NaOH +HCl → H2O and NaCl.

For the given experiment, the time taken by liquids to freeze is the dependent variable.

A variable can be described as an alphabet that is utilized to represent an unknown number. A variable can be described as a quantity that can be changed according to the mathematical problem.

The dependent variable can be defined as a variable that depends on the value of another variable. The dependent variable can be described as the output of a function. If the dependent variable changes then there will be a change in the independent variable.

In the given experiment, both liquids will take different times to freeze. Therefore when she checks them every five minutes until one of them had frozen makes the time a dependent variable.

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Answer:

Inversely proportional.

Explanation:

The density and temperature relationship for ideal gases is mathematically written as- Density and Temperature Relationship The density and temperature relation are proportionate. That is, the density is inversely proportional to temperature.

The magnitude of the equilibrium constant Kc determines the direction and extent of a reaction.

The equilibrium constant, denoted as Kc, is a numerical value that relates the concentrations of reactants and products at equilibrium in a chemical reaction. It is calculated using the concentrations of the species involved in the reaction. The magnitude of Kc indicates the relative abundance of products compared to reactants at equilibrium.

A small Kc value indicates that the concentration of products is low compared to reactants, suggesting that the reaction system predominantly favors the reactants. This means that the reaction proceeds more in the backward direction.

Conversely, a large Kc value suggests that the concentration of products is high compared to reactants, indicating that the reaction system predominantly favors the products. This implies that the reaction proceeds more in the forward direction.

An intermediate Kc value indicates that the reaction system is balanced, with comparable concentrations of products and reactants. This suggests that the reaction is proceeding in both the forward and backward directions to a significant extent.

the magnitude of Kc provides important information about the direction and extent of a reaction. It helps determine whether a reaction predominantly favors the reactants, products, or is in a balanced state at equilibrium.

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Answer:

c

Explanation:

Nh4OH + HCL ---> NH4Cl + H3O

so ph decreases as H3O increases

and OH also decreases

When NH4OH is added to a solution with HCI, the pH of the solution B ) increases as the OH- concentration increases.

NH₄OH is a strong base as a result of the presence of the OH compound which is a base as well. Bases have high pH and acids have low pH.

This means that as the OH- concentration increases, the solution is being made to be more basic which would lead to the pH rising.

In conclusion, option B is correct.

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Answer:

.084 M

Explanation:

Molar mass of sucrose = 342.3

The formula to find molarity is moles of solute / liters of solution

Since we need to turn grams to moles for this equation we do 104 / 342.3 = 0.304

Now we can use the equation listed above. .304 / 3.6 = 0.084 M

Answer:

solid liquid gas and plasma

Explanation:

more saturated than solution one

Safety is of paramount importance in the molecular modeling lab. There are several important safety issues that must be addressed in a molecular modeling lab. These include Proper handling, storage and disposal of chemicals, ventilation and training.

1. Proper handling of chemicals: It is important to always wear gloves, goggles, and lab coats when handling chemicals in the lab. This will help protect you from spills, splashes, and accidental ingestion.

2. Proper ventilation: It is important to ensure that the lab has proper ventilation to prevent the build-up of toxic gases and vapors. This may include using fume hoods, vented cabinets, or other types of ventilation systems.

3. Proper storage of chemicals: It is important to store chemicals properly to prevent spills, leaks, and accidental ingestion. This may include using appropriate containers, labeling all chemicals, and keeping chemicals in a secure location.

4. Proper disposal of chemicals: It is important to dispose of chemicals properly to prevent contamination of the environment and to protect the health and safety of lab workers. This may include using approved disposal methods, such as incineration, neutralization, or recycling.

5. Proper training: It is important to ensure that all lab workers are properly trained in the use of chemicals, equipment, and safety procedures. This may include providing regular training sessions, providing written materials, and conducting regular safety inspections.

By addressing these safety issues, you can help ensure that your molecular modeling lab is a safe and productive environment.

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Explanation:

the answer will be 98.4 kJ

As per concept of enthalpy of fusion , 98,397 joules of energy  are required to freeze 10 g of water  at 0°C.

Enthalpy of fusion is defined as the enthalpy change which results from when  a substance changes its state from solid to  a liquid at a constant pressure.Heat of solidification is opposite of enthalpy of fusion.During fusion  there is a phase transition which takes place, from liquid to solid.

The temperature at which the fusion takes place is called as the fusion temperature. This enthalpy is accompanied without any change in temperature.

Enthalpy of fusion  of water=333.55 J/g  . This value is for 1 g of water as per definition,hence for 10 g water enthalpy of fusion is 10×333.55=3335.5 J.

Hence, 3335.5 joules are required for freezing 10 g sample.

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Given:

Sum of masses of two isotopes = 371.9087 u

Re-185 natural abudance = 37.40%

Re-187 natural abudance = 62.60%

Known:

atomic weight of Re = 186.207 u

Atomic mass of Re-185:

To find the atomic mass of Re-185, take the total mass given and subtract atomic weight.

abundance of Re-185 = 37.40% = 0.3740

(371.9087 - x) = atomic weight of Re-187 in u

To find mass of Re-187:

abundance of Re-187 = 62.60% = 0.6260

Solution:

Step 1. Multiply x times the abundance of Re-185 and multiply (371.9087 - x) times the abundance of Re-187.

Re-185: (0.3740)(x) = 0.3740x

Re-187: (0.6260)(371.9087 - x) = 232.8148462 - 0.6260x

Step 2. Add the results and set them equal to 186.207.

0.3740x + 232.8148462 - 0.6260x = 186.207

Step 3. Solve for x by subtracting 232.8148462 from both sides and then divide both sides by -0.2520.

0.3740x + 232.8148462 - 0.6260x - 232.8148462 = 186.207 -

232.8148462

0.3740x - 0.6260x = -46.6078462

-0.2520x = -46.6078462

-0.2520x/-0.2520x = -46.6078462/-0.2520

x = 184.9517706 u

Step 4. Atomic weights of Re-185 and Re-187.

x = 185.0 u = the atomic weight of Re-185

(371.9087 - 184.9517706) = 186.9569294 = 187.0 u = the atomic weight of Re-187

Therefore the atomic weight of Re-185 is 185.0 u, and the atomic weight of Re-187 is 187.0 u.

Answer:

Rainfall can affect influent flow rate and compositions of wastewater, and thus further affect wastewater treatment performance and the effluent quality.

Explanation:

Yes, that's correct. The chemical formula "\(BaCl_2\)" represents the ratio of the elements in the compound barium chloride. In this case, it means there is one barium (Ba) atom and two chlorine (Cl) atoms in each representative unit of the compound.

What is the chemical formula?

The term chemical formula has to do with the way that the atoms that compose the substance are arranged. The arrangement of the atoms in the chemical substance would help us to have an idea of how the compound appears.

Now we are looking at the compound barium chloride of which we know that it is an ionic subsnace and since the substance is ionic in nature, we would talk about a formula unit of the compound as beings its representative unit in the crystal lattice of the substance.

The question above is incomplete, the complete question is:

The formula for barium chloride is BaCl2. The chemical formula for barium chloride shows the number of ___________ of each element in the ___________ representative unit of the substance.

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It would take 147 hours for 320 g of the sample to decay to 2.5 grams from the information provided.

Radioactivity refers to the decay of a nucleus leading to the spontaneous emission of radiation. The half life of a radioactive nucleus refers to the time required for the nucleus to decay to half of its initial amount.

Looking at the table, we can see that the initial mass of radioactive material present is 186 grams, within 21 hours, the radioactive substance decayed to half of its initial mass (93 g). Hence, the half life is 21 hours.

Using the formula;

k = 0.693/t1/2

k = 0.693/21 hours = 0.033 hr-1

Using;

N=Noe^-kt

N = mass of radioactive sample at time t

No = mass of radioactive sample initially present

k = decay constant

t = time taken

Substituting values;

2.5/320= e^- 0.033 t

0.0078 = e^- 0.033 t

ln (0.0078) = 0.033 t

t = ln (0.0078)/-0.033

t = 147 hours

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Answer:

the answer is true

Explanation:

the reason why is because if you look at it a chemical in a repeating form os a compound so that means it is the same properties for food.

Answer:

True

Explanation:

Many different species eat grass, and rabbits can eat other plants besides grass. Foxes, in turn, can eat many types of animals and plants. Each of these living things can be a part of multiple food chains.

Answer:

another diamond ....theres nothing else that can that I know of.

Answer:

Kelp --> sea urchin --> sea otter

The number of grams of zinc chloride produced when 6.21 g of zinc is reacted with excess hydrochloric acid is 6.45 g.

A balanced chemical equation, or one in which the mass of the reactants and products are equal, contains the same number of atoms of each element on both sides of the equation.

The balanced chemical equation for the reaction between zinc (Zn) and hydrochloric acid (HCl) is:

Zn + 2 HCl → ZnCl₂ + H₂

To calculate the number of grams of zinc chloride produced, we need to know how many moles of zinc reacted. We are given that 6.21 g of zinc reacted, so we can calculate the number of moles of zinc as follows:

moles of Zn = mass / molar mass

moles of Zn = 6.21 g / 65.38 g/mol (molar mass of Zn)

moles of Zn = 0.095 moles

Since two moles of hydrochloric acid react with one mole of zinc chloride, the number of moles of zinc chloride produced will be half of the number of moles of zinc:

moles of ZnCl₂ = 0.095 moles / 2

moles of ZnCl₂ = 0.0475 moles

Finally, we can calculate the mass of zinc chloride produced using its molar mass:

mass of ZnCl₂ = moles of ZnCl₂ x molar mass

mass of ZnCl₂ = 0.0475 moles x 136.29 g/mol (molar mass of ZnCl₂)

mass of ZnCl₂ = 6.45 g

Therefore, the number of grams of zinc chloride produced when 6.21 g of zinc is reacted with excess hydrochloric acid is 6.45 g.

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The purchase process involves steps such as initiating a request, vendor selection, approval, purchase order issuance, product delivery, and payment, ensuring a systematic approach to procurement for accountability and efficiency.

The purchase process consists of several steps:

1. The department admin initiates the process by sending a purchase request to the IT department.
2. The IT Manager reviews the request and decides whether to approve or reject it.
3. If the request is approved, the IT Manager contacts various vendors, such as Apple, Dell, HP, ASUS, and Lenovo, to request quotes.
4. The IT Manager receives the quotes and selects the best price.
5. Once the best price is selected, the IT Manager informs the admin and waits for their approval.
6. If the admin approves, the IT Manager finalizes the vendor selection and prepares the purchase request.
7. The IT Manager then sends the purchase request to the Procurement Supervisor.
8. The Procurement Supervisor receives the request and issues a purchase order to the chosen vendor.
9. The Procurement Supervisor reviews the vendor's invoice and processing time.
10. If the processing time elapses and the tracking number has not been received, the Procurement Supervisor cancels the order.
11. If the vendor provides the tracking number within the processing time, the Procurement Supervisor collects the product once it is delivered.
12. At the same time, the Procurement Supervisor submits the payment to the vendor.
13. Once both steps are completed, the purchase process is considered finished, and the purchase is completed.

This process ensures that there is a clear and systematic approach to purchasing items, from the initial request to the final delivery and payment. Each step is important in maintaining accountability and efficiency in the procurement process.

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if the concentration of nitrogen or hydrogen is increased, the pressure is increased, or the temperature is decreased, the equilibrium of the Haber process will shift towards the products (ammonia). Conversely, if the concentration of ammonia is increased or the temperature is increased, the equilibrium will shift towards the reactants (nitrogen and hydrogen).

the equilibrium of the Haber process shifts under certain conditions. The Haber process is represented by the following equilibrium reaction:

N2(g) + 3H2(g) ⇌ 2NH3(g) + 91.8 kJ

Now, let's discuss the concept of equilibrium. In a chemical reaction at equilibrium, the rate of the forward reaction is equal to the rate of the reverse reaction. This means that the concentrations of the reactants and products remain constant over time.

To determine in which direction the equilibrium will shift when conditions change, we can use Le Chatelier's principle. This principle states that when a system at equilibrium is subjected to a change in temperature, pressure, or concentration of reactants/products, the system will adjust to counteract the change and re-establish equilibrium.

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Answer: Convection

Explanation:

Convection is the transfer of heat from a surface by mean of a fluid  such as air.  Natural convection occurs as air is heated :  it expands , rises, and is replaced by cooler air.

The importance of the use of hydrates in fire extinguishers are;

-They keep fire extinguishers dry during shipping and storage.

-They create foams that have high water content to help extinguish fires.

They create high pressure in the cylinder to quickly force out the fire r*tardant.

We know that a fire extinguisher has to do with any device that has been made in such a way that the device can be used to eliminate a flame that is burning. We all know that fore can be very destructive. This implies that it is important to be able to put out the fire so that it does not cause big problems.

The fire extinguisher is composed of certain chemical substances that are able to react together quickly and then be able to quench the flame of the reaction that is going on in the system.

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Answer:

free fall

Explanation:

the answer is the third one.

Answer:

what are the answer choices

Explanation:

Answer:

3x

Explanation:

Answer:

The element formed when a radioactive element undergoes radioactive decay. The latter is called the parent. The daughter may or may not be radioactive.

Explanation:

hope this helps

Answer:

Zinc metals was oxidized ,zinc ions were reduced

Explanation:

The zinc atoms lose electrons and becomes oxidized . And zinc ions gain electrons (becomes reduced)

The redox reaction taking place here, is the zinc metal is oxidized and zinc ions are reduced further by accepting electrons. Hence, option a is correct.

In a redox reaction, one reactant species is oxidized and another one is reduced. Oxidation is the process of loss of one or more electrons to form its higher oxidation state.

Reduction is the process of gaining electrons forming its lower oxidation state. The species which undergoes oxidation is called oxidant and the one reduced is called reductant.

Zn metal have higher negative electrode potential and undergoes oxidation by losing two electrons to form the Zn²⁺ ions. Thus the Zn metal is oxidized.  The Zn²⁺ ions further undergoes reduction to form the metal by gaining electrons.

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