1. explain the pH change when the strong acid was added to the prepared buffer solution in relation to the pH of the buffer solution . Also indicate the change in the ph when the acid was mixed with the deionized water in relation to the deionized water ph. Based on the results obtained did the prepared buffer solutions resisit a ph change when minimal amounts of acid or base were mixed into the solution?

Answer:

\({ \tt{kelvin = 273 + celcius \: degree}} \\ { \boxed{ \bf{celcius = kelvin - 273}}}\)

Answer:

To convert Kelvins into Celsius degrees, the formula is K − 273.15 = °C

Pls mark me brainliest.

Answer:

1. changing from liquid to gas state

Evaporation

2. the combining substances in a reaction

Reactants

3. radiation

Gamma Rays

4. slow oxidation

Rust

5. melting point of water

0˚ C (0 degrees Celsius)

6. a reaction between a substance and oxygen

Oxidation

7. pertaining to the nucleus of an atom

Nuclear

8. to fuse or join together

Fusion

9. rapid oxidation

Burning

10. heat

Thermo-

The change in liquid to gas state is called evaporation.  Evaporating a liquid will energize the molecules and converts them to the gaseous state.

A change in state or phase of a substance is called a physical change where, one state changes to the other like liquid vaporize to form gases.

Thus, first option is matching with 4th one evaporation.

The combining substances in a reaction is called reactants.

One example of radiation given here is gamma rays.

An example of slow oxidation is rusting that is the formation of red iron oxide on corroding metals.

Melting point of water is 0 ⁰C.

A reaction between a substance and oxygen is called oxidation.

A common  term pertaining to the nucleus and of an atom is nuclear.

The process of fusing or joining of two species together is called fusion.

Thermal process are involving rapid oxidation.

Heat is a form of energy where overheating anything causes burning.

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Answer:

what we have to do ? pls paste the whole question .

Explanation:

Answer:

Catholics believe prayer is important for several reasons. Firstly, prayer is a means of communicating with God and building a personal relationship with Him. Through prayer, Catholics seek guidance, forgiveness, and strength to face life's challenges. They believe that prayer can bring peace of mind, reduce anxiety, and provide comfort during difficult times.

Secondly, prayer is considered a powerful spiritual weapon that can change the course of events, and it is a way to participate in the work of God. Catholics practice different types of prayers, including adoration, confession, thanksgiving, and supplication. Adoration involves praising God for his goodness and greatness. Confession is acknowledging one's sins and asking for forgiveness. Thanksgiving is expressing gratitude for blessings and gifts. Supplication is asking for help or interceding for others. Catholics also practice contemplative prayer, which is a silent form of prayer where one seeks to connect with God through meditation and listening. Overall, for Catholics, prayer is a fundamental practice of their faith, and it helps them to live a more fulfilling and meaningful life.

Explanation:

Answer:

1.25 m

Explanation:

there are 100 cm in a metre. So to convert cm to m you divide the cm by 100

there are 1.25 meters in 125 cm

Answer:

true

Explanation:

as you get closer to the center it gets hotter

Answer:

Chain reaction

Explanation:

The least likely term to be included in a list of observational learning terms is "Reinforcement,"

Observational learning refers to the process of acquiring new behaviors or modifying existing ones by observing others' actions and their consequences. The other options (A, B, and D) are all key terms in observational learning.

The Bobo doll is a famous example of observational learning, where children learn aggressive behavior by watching an adult model interacting with a Bobo doll. Models are the people or characters that individuals observe and imitate.

Mirror neurons are brain cells that activate when an individual performs an action or observes someone else performing the same action.

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Full Question: Which is LEAST likely to be included in a list of observational learning terms?

A) Bobo doll

B) Model

C) Reinforcement

D) Mirror neuron

The sample of oxygen will occupy approximately 18.5 mL at -70 °C and the same pressure.

The force exerted by a gas on specific area is known as gas pressure..

As we know, (P₁ V₁) /(T₁) = (P₂V₂) /(T₂)

Given, P₁ is the initial pressure (452 torr); V₁ is initial volume (32.2 mL)

T₁ is initial temperature in Kelvin (30 °C + 273.15 = 303.15 K)

P₂ is final pressure (452 torr); V₂ is final volume (what we want to find)

T₂ is the final temperature in Kelvin (-70 °C + 273.15 = 203.15 K)

Now, V2 = (P₁ V₁ T₂) / (P2 T₁)

V₂ = (452 torr x 32.2 mL x 203.15 K) / (452 torr x 303.15 K)

V₂ ≈ 18.5 mL

Therefore, the sample of oxygen will occupy approximately 18.5 mL at -70 °C and the same pressure.

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Nitrogen is a diatomic molecule in the VA family on the periodic table. Nitrogen has five valence electrons, so it needs three more valence electrons to complete its octet. A nitrogen atom can fill its octet by sharing three electrons with another nitrogen atom, forming three covalent bonds, a so-called triple bond.

I'm frosty da showman

The best choice for screening a person's genetics for 1,000 or more genes would be: C. Sequencing.

Sequencing techniques, such as next-generation sequencing (NGS), are well-suited for screening a large number of genes efficiently and comprehensively. NGS allows for high-throughput sequencing of DNA, enabling the simultaneous analysis of multiple genes or even the entire genome. It provides detailed information about the sequence of nucleotides in the DNA, allowing for the identification of genetic variations, mutations, or other genomic features.

Microarray analysis (A) is a technique that can analyze gene expression patterns or detect specific genetic variations, but it is limited in the number of genes it can assess simultaneously compared to sequencing.

RELP analysis (B) is a technique used for detecting genetic variations based on restriction enzyme digestion patterns, but it is more suitable for specific target regions rather than screening a large number of genes.

Karyotyping (D) involves the visualization and analysis of chromosomes to detect large-scale chromosomal abnormalities but is not suitable for screening a large number of individual genes.

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Answer:

Noble gasses

Explanation:

nobled gasses

all elements want to loose or gain electrons to be like the noble gasses in bonding but the noble gasses do not bond.

The statement "molecules move in random directions when heated in a heat engine, and because of the lack of uniformity in the direction of molecular movement" is true.

When a heat engine is heated, molecules absorb heat energy and their kinetic energy increases. The kinetic energy of molecules causes them to move around. However, this movement is not uniform, and the molecules move in random directions.

A heat engine is a device that converts thermal energy into mechanical energy. Heat engines operate on the principle of thermodynamics.

They work by taking in thermal energy from a high-temperature reservoir, converting some of it into mechanical energy, and then releasing the remaining thermal energy to a low-temperature reservoir.The internal combustion engine in a car, the steam engine in an old locomotive, and the turbine in a power plant are all examples of heat engines. They all convert heat energy into mechanical energy to perform work.

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Answer:

Explanation: Take, for example, an ice cube in an open or closed container, that is in the process of melting at room temperature. There is solid water, liquid water, and water vapour (gas) in the air.

If the p-value is greater than or equal to the significance level (α = 0.01), do not reject the null hypothesis.

To test the hypotheses using the χ2 goodness of fit test, we will perform the following steps:

(a) P-value approach:

State the null hypothesis (H0): The population proportions are pA = 0.40, pB = 0.40, and pC = 0.20.

State the alternative hypothesis (Ha): The population proportions are not pA = 0.40, pB = 0.40, and pC = 0.20.

Calculate the expected frequencies for each category. Multiply the sample size (n = 200) by the respective population proportion for each category:

Expected frequency for category A = 200 * 0.40 = 80

Expected frequency for category B = 200 * 0.40 = 80

Expected frequency for category C = 200 * 0.20 = 40

Calculate the test statistic (χ2) using the formula:

χ2 = Σ [(Observed frequency - Expected frequency)2 / Expected frequency]

χ2 = [(80 - 80)2 / 80] + [(20 - 80)2 / 80] + [(100 - 40)2 / 40]

χ2 = (0 + 100 + 150) / 80

χ2 = 2.875

Determine the degrees of freedom (df). In this case, df = number of categories - 1 = 3 - 1 = 2.

. The p-value is the probability of observing a test statistic as extreme as the one calculated, assuming the null hypothesis is true.

State your conclusion based on the p-value:

If the p-value is less than the significance level (α = 0.01), reject the null hypothesis.

If the p-value is greater than or equal to the significance level (α = 0.01), do not reject the null hypothesis.

(b) Critical value approach:

State the null hypothesis (H0) and alternative hypothesis (Ha) as mentioned above.

Calculate the test statistic (χ2) using the formula as mentioned above. In this case, χ2 = 2.875.

Determine the critical values for the rejection rule using the degrees of freedom (df = 2) and the significance level (α = 0.01). The critical values can be found from the χ2 distribution table.

Lower critical value: χ2 < (value from the table at α/2 with df = 2)

Upper critical value: χ2 > (value from the table at 1 - α/2 with df = 2)

Compare the calculated test statistic with the critical values:

If the test statistic is less than the lower critical value or greater than the upper critical value, reject the null hypothesis.

If the test statistic falls between the critical values, do not reject the null hypothesis.

State your conclusion based on the rejection rule.

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Answer:

It's going to be a postive charge because although theres a lot more neutrons then the rest of them, neutrons are neutral, which won't have much of an effect to the charge of the atom. 4 protons has a larger proportion to the rest.

The observation which corresponds to physical change are a liquid freezes into a solid and a solid dissolves into water.

The observation which corresponds to chemical change are a solution heats up upon mixing with another, the color of a substance changes over time, bubbles are produced upon mixing two solutions, and a precipitate is formed from two solutions.

When it comes to determining whether each observation corresponds to a physical change or a chemical change:

1. A liquid freezes into a solid corresponds to a physical change.

The explanation for this is that physical changes occur when the form of the substance alters, but the chemical composition of the substance stays the same. Because the liquid's chemical composition does not alter during the process of freezing, it is classified as a physical alteration.

2. A solution heats up upon mixing with another corresponds to a chemical change.

A chemical change is one in which the composition of the substance changes. This is most commonly accomplished through a chemical reaction, which is when the original molecules are transformed into new molecules. In this instance, when two solutions are combined and heat is generated, a chemical reaction is occurring.

3. A solid dissolves into water corresponds to a physical change.

The explanation for this is that the process of dissolving a solid into water does not alter the chemical composition of the solid. Instead, the solid's particles are separated by the water particles, resulting in a homogenous solution. Because the chemical composition remains constant, it is classified as a physical change.

4. The color of a substance changes over time corresponds to a chemical change.

This alteration is often linked to a chemical reaction. When a substance's color changes over time, it is frequently due to the presence of a different substance. As a result, the chemical composition of the original substance is altered. As a result, it is classified as a chemical alteration.

5. Bubbles are produced upon mixing two solutions corresponds to a chemical change.

This alteration is often linked to a chemical reaction. When two substances combine and produce bubbles, it is usually the result of the generation of a new gas. As a result, the original molecules have transformed, resulting in a new substance. As a result, it is classified as a chemical alteration.

6. A precipitate is formed from two solutions corresponds to a chemical change.

When two solutions are combined, they frequently react to form a precipitate. This indicates that a new substance has been produced, and the original substance's composition has been altered. As a result, it is classified as a chemical alteration.

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The theoretical yield of CO2 is 29.34 g.

To determine the limiting reactant and theoretical yield, we need to first write a balanced chemical equation for the reaction between O2 and C2H5OH. The balanced equation for the complete combustion of C2H5OH is:

C2H5OH + 3 O2 → 2 CO2 + 3 H2O

From the balanced equation, we can see that 1 mole of C2H5OH reacts with 3 moles of O2 to produce 2 moles of CO2.

Next, we need to calculate the number of moles of each reactant present in the given amounts:

- Moles of O2 = mass / molar mass = 32 g / 32 g/mol = 1 mol

- Moles of C2H5OH = mass / molar mass = 23 g / 46.07 g/mol = 0.5 mol

According to the stoichiometry of the balanced equation, 1 mole of C2H5OH reacts with 3 moles of O2. Therefore, O2 is the limiting reactant because we have only 1 mole of O2 available, which is less than the 3 moles required to react completely with 0.5 moles of C2H5OH.

To calculate the theoretical yield of CO2, we need to use the amount of limiting reactant as a basis for our calculation. From the balanced equation, we know that 1 mole of C2H5OH reacts to produce 2 moles of CO2. Therefore, with O2 being the limiting reactant, the maximum amount of CO2 that can be produced is:

Theoretical yield of CO2 = moles of O2 × (2 moles of CO2 / 3 moles of O2) × molar mass of CO2

= 1 mol × (2/3) × 44.01 g/mol

= 29.34 g

Therefore, the theoretical yield of CO2 is 29.34 g.

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The pH of a solution if 10 ml of a 1 M HCl solution is added to 10 ml of a 1 M NaOH solution can be calculated as follows:

First, let's find the number of moles of HCl and NaOH in the solution. Number of moles of HCl = Concentration of HCl x Volume of HClNumber of moles of HCl = 1 M x (10 ml/1000 ml)Number of moles of HCl = 0.01 molesNumber of moles of NaOH = Concentration of NaOH x Volume of NaOHNumber of moles of NaOH = 1 M x (10 ml/1000 ml)Number of moles of NaOH = 0.01 molesNext, let's find the net number of moles of H+ and OH- ions.Number of moles of H+ ions = Number of moles of NaOH - Number of moles of HCl.Number of moles of H+ ions = 0.01 - 0.01Number of moles of H+ ions = 0 molesNumber of moles of OH- ions = Number of moles of HCl - Number of moles of NaOHNumber of moles of OH- ions = 0.01 - 0.01Number of moles of OH- ions = 0 molesSince the net number of moles of H+ ions and OH- ions is zero, the solution is neutral. The pH of a neutral solution is 7. Therefore, the pH of the solution is 7.

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Answer:

51207 torr is the new pressure of the gas

Explanation:

We can solve this question using combined gas law that states:

P1V1T2 = P2V2T1

Where P is pressure, V volume and T absolute temperature of 1, initial state and 2, final state of the gas

Computing the values of the problem:

P1 = 710torr

V1 = 5.0x10²mL

T1 = 273.15 + 30°C = 303.15K

P2 = ?

V2 = 25mL

T2 = 273.15 + 820°C = 1093.15K

Replacing:

710torr*5.0x10²mL*1093.15K = P2*25mL*303.15K

3.881x10⁸torr*mL*K = P2 * 7.579x10³mL*K

P2 = 51207 torr is the new pressure of the gas

Answer:

Water molecules' adhesion aids plants in moisture absorption at their roots. Water's initial boiling point is attributed to cohesion, which helps animals regulate their body temperature.

Explanation:

Answer:

It will sink.

Explanation:

Density of water=1gm/cc (In CGS)

Volume of cube=l^3 =3^3= 27cc

Mass of cube =54gm

Density of cube=M/V =54/27 =2gm/cc

Here, density of cube is greater than that of water. So, the cube sinks.

The heat absorbed when 15.0 g of water freezes is 5.01 kJ.

Chemical reaction or physical change is endothermic if heat is absorbed by the system from the surroundings.

The heat absorbed or released during a phase change can be calculated using the equation q = mL,

where

For the case of 15.0 g of water freezing, the heat absorbed can be calculated as follows:

q = mL

q = (15.0 g) * (6.01 kJ/mol) / (18.015 g/mol)

q = 5.01 kJ

Therefore, the heat absorbed when 15.0 g of water freezes is 5.01 kJ.

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Answer:

Explanation:

In this chemistry lab, students investigate how to build and launch a simple rocket that uses hydrogen and oxygen gases that will be mixed to propel the rocket (large bulb plastic pipette). Students will understand the principles of combustion reactions, kinetics, stoichiometry of reactions, activation energy, explosive mixtures, rocketry, and different types of chemical reactions. Students will explore and determine the proportions of hydrogen and oxygen mixture that will achieve the best launch results. Students will compare the balanced chemical reaction of hydrogen and oxygen with their lab results; students should discover that the optimal distance occurs when the mixture of hydrogen and oxygen is two to one hydrogen, oxygen mixture ratio and this can be determined theoretically from the balanced chemical reaction equation. Students will perform the lab, collect data, and discuss, compare, and contrast their lab findings with the balanced chemical reaction equation. Students will present their structured inquiry investigations using a power-point presentation. Other groups along with the teacher will assess each group by using a provided rubric. Group assessments will be the deciding assessment for the final lab score. A follow up activity could investigate how NASA scientists launch real rockets into space and propose a procedure to investigate and collect data on a launching a heavier object at the school football field.

Answer:

Roasting s'mores over a fire.

Ironing the wrinkles out of my shirts.

Wet clothes are dried with the hot air of the dryer.

Small speakers in your headphones use electricity and moving magnets to create sound waves.

Explanation:

Acetic acid's acid dissociation constant (Ka) is approximately 2.95× \(10^{(-3)}\).

The pH of a solution is the concentration of hydrogen ions in the solution.

The relationship between pH, Ka, and the concentrations of the acid and its conjugate base is

\(pH = pK_{a} +log \frac{[A^{-}]}{[HA]}\) where \([A^{-}]\) is the concentration of \(CH_{3}COO^{-}\).

In this case, the pH is given as 2.47, and the concentration of acetic acid is 0.63 M. We can assume that the concentration of the conjugate base (acetate ion, \(CH_{3}COO^{-}\)) is inappreciable as compared to the concentration of the acid. It is because the given acid is a weak acid and does not dissociate easily.

Using the Henderson-Hasselbalch equation, we can rearrange it to solve for pKa:

\(pK_{a} = pH-log\frac{[A^{-}]}{[HA]}.\)

As the concentration of the conjugate base is very less so, we can simplify the equation to:

\(pKa = pH \\Ka =10^{(-pKa)}=10^{(-2.47)}.\)

So, Ka ≈ 2.95 × \(10^{(-3)}\).

The complete question is

The pH of a 0.63 M solution of acetic acid is measured to be 2.47. Calculate the acid dissociation constant K of acetic acid. Be sure your answer has the correct number of significant digits.  

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Because the spectra exhibit distinctive peaks of OH functional groups, they are consistent with the two alcohols. The spectra confirm what was initially described.

The distinct peak patterns in the spectra of the two alcohols allow for their identification and differentiation. It is hard to give a detailed justification for why the spectra belong with each of the two alcohols without knowledge of the spectra of the two alcohols. Many methods, including Infrared (IR) spectroscopy, Gas Chromatography (GC), and Nuclear Magnetic Resonance, can be used to distinguish between the two alcohols and conclusively identify them based on their spectra (NMR). These methods may be used to determine the functional groups that are present in molecules, their molecular structure, and their location within the molecules. A comparison with the known spectra of other alcohols may be conducted in light of the specific patterns or peaks seen in the spectra, and the precise identification can then be achieved.

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An electrolytic cell is a cell in which an electric current drives a no spontaneous reaction.

What is electrolytic cell?

Any apparatus in which excess electricity is changed into chemical energy or conversely is an electrolytic cell. Such a cell normally includes two electrodes, which can be metal or electrical conductors, kept apart from one another and in interface with an electrolyte (q.v. ), which is commonly an ionic compound that has been dissolved or fused.

For instance, water can be electrolyzed to create gaseous oxygen and gaseous hydrogen with the use of an electrolytic cell.

Electrical energy is transformed into chemical energy in an electrolytic cell. Electricity is generated in this situation as a result of a spontaneous redox reaction. Electricity must be provided to start the redox reaction because it is not spontaneous.

Therefore, Option C is correct.

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