Please help ASAP I’ll make you u as brainlister please 100 points pelaseee

Answer:

B. endothermic reaction

Explanation:

Answer:

A)

Explanation:

the the amount of mass in the object

Answer:

b

Explanation:

Density is a measure of mass per volume. The average density of an object equals its total mass divided by its total volume. An object made from a comparatively dense material (such as iron) will have less volume than an object of equal mass made from some less dense substance (such as water).

Answer:

Thin layer chromatography is a chromatographic technique used to separate the components of a mixture using a thin stationary phase supported by an inert backing and a mobile phase. The separation principle is in the different affinities between the components of the mixture and the stationary or mobile phase.

The affinity in mobile phase could be improved changing the polarity of this phase. In this case, you could change proportion of hexane/ethyl acetate to change polarity of mobile phase and the affinity of the different compounds to mobile or stationary phase.

Explanation:

The ATP-PC creation pathway does not require oxygen. This is because it is an anaerobic process that occurs in the cytoplasm of cells.

The ATP-PC pathway is one of the body's energy systems used during high-intensity exercise. It involves the breakdown of phosphocreatine (PC) to create ATP, the body's primary energy source. This process occurs in the cytoplasm of cells and does not require oxygen, making it an anaerobic process. This pathway is important for activities that require short bursts of energy, such as sprinting or weightlifting. However, it is limited in its duration and capacity to produce ATP. Once the PC stores are depleted, the body must switch to another energy system, such as glycolysis or oxidative phosphorylation, to continue producing ATP.

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The correct option is (B) increase.

If the number of molecules of gas a is doubled, the rate of reaction will increase.

The measure of the change in reactant or product concentration per unit of time is known as the reaction rate for a specific chemical reaction.

The speed at which a chemical reaction proceeds is known as the reaction rate. The concentration of a reactant that is consumed in a unit of time or the concentration of a product that is produced in a unit of time is two common ways to define it (amount per unit volume).

The rate law and collision theory both state that reaction rate increases with concentration. Collisions happen more frequently as reactant concentration rises. Pressure causes a rise in the rate of gaseous reactions, which is actually comparable to a rise in the gas's concentration.

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The complete question is:

"Consider two gases, A and B, are in a container at room temperature. What effect will the following changes have on the rate of the reaction between these gases? The number of molecules of gas A is doubled.

(A)decrease

(B)increase"

Answer:

the answer is A

Explanation:

hope it hlp

Answer:

NaCl

The overall ionic formula for a compound must be electrically neutral, meaning it has no charge.

When writing the formula for the ionic compound, the cation comes first, followed by the anion, both with numeric subscripts to indicate the number of atoms of each.

ions are formed when metals are combined with nonmetals

The mixtures would result in the pk, of the acid being obtained from a direct pH measurement of the resulting solution is  25 cm³ 0.1 mol dm⁻³HCl and 25 cm³ 0.1 mol dm⁻³ NaCl. Therefore, option A is correct.

The pH scale, which previously stood for "potential of hydrogen," is used to describe how acidic or basic an aqueous solution is. The pH values of acidic solutions are lower than those of basic or alkaline solutions.

The pH scale determines how acidic or basic water is. The range is 0 to 14, with 7 representing neutrality. Acidity is indicated by pH values below 7, whereas baseness is shown by pH values above 7. In reality, pH is a measurement of the proportion of free hydrogen and hydroxyl ions in water.

A solution's pH is a significant indicator of its chemical composition. The pH can affect how readily available nutrients are, how biological processes work, how bacteria behave, and how chemicals behave.

Thus, option A is correct.

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M1V1 = M2V2

M1 = 3.000 M

V1 = 0.8000 L

M2 = ?

V2 = 2.00 L

M2 = M1V1/V2 = (3.000 M)(0.8000 L)/(2.00 L) = 1.20 M

A chemist pours 500 mL of a 3.0000 molar solution of sodium hydroxide into a 3.0000 liter volumetric flask and fills the flask up with water. 1.20 M is the molarity of the new solution.

Molarity is also known as concentration in terms of quantity, molarity, or substance. It is a way to gauge how much of a certain chemical species—in this case, a solute—is present in a solution. It refers to a substance in unit volume for solution in terms of quantity.

The amount of moles / litre is the molarity unit that is most frequently used in chemistry. One mol/L of a solution's concentration is referred to as its molarity. It is frequently abbreviated as 1 M. When one gramme of solute dissolves in one litre of solution, the solution has a molarity of one.

M1V1 = M2V2

M1 = 3.000 M

V1 = 0.8000 L

M2 = ?

V2 = 2.00 L

M2 = M1V1/V2 = (3.000 M)(0.8000 L)/(2.00 L) = 1.20 M

Therefore, 1.20 M is the molarity of the new solution.

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Answer:

It should be kept upright not tilted.

Bulb should be surrounded from all sides by the substance of which the temperature is to be measured.

The bulb should not touch the surface of the container.

Hope this helps

physical property is conductivity

The statement is true.

When two amino acid monomers are positioned so that the carboxyl group of one is adjacent to the amino group of the other, they can be joined through a dehydration reaction.

What are amino acids?

The building blocks of protein in your body are called amino acids. In other words, you can't actually develop new muscle without your amino acids when it comes to protein synthesis. Your body can produce amino acids on its own as a byproduct of regular activity, which are known as your nonessential amino acids.

A dehydration reaction can unite two amino acid monomers when they are arranged so that the carboxyl group of one is next to the amino group of the other.

Thus, the made assertion is true.

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Answer:

NH3 + 02 > NO + H2O

Explanation:

The number of moles of NaF that will be produced from 3moles of Na is 3 moles.

Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).

According to this question, sodium reacts with fluorine as follows:

2Na+ F₂ → 2NaF

Based on the above equation, 2 moles of Na will produce 2 moles of NaF

This means that 3 moles of Na will produce 3 moles of NaF.

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The ion that is oxidized in the above redox reaction is Mg (option A). Details about oxidation can be found below.

Oxidation in a redox reaction is a reaction in which the atoms of an element lose electrons and the oxidation state of the element increases.

According to this question, the redox reaction is given as follows: Mg + Cl2 = Mg2+ + 2Cl–

As shown in the above redox reaction, Magnesium oxidation number increases from 0 to 2+, therefore, is the one being oxidized.

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AnswerAAAAA

Explanation:

Outgoing shortwave radiation depends on factors such as the angle of the Sun's rays, albedo, cloud cover, and atmospheric gases. These factors collectively determine the amount of solar radiation that is reflected, absorbed, and re-emitted by the Earth's surface, influencing the outgoing shortwave radiation.

Outgoing shortwave radiation depends on several factors. Firstly, it is influenced by the solar radiation received by the Earth's surface. The amount of solar radiation reaching the Earth is determined by the angle of the Sun's rays, which changes throughout the day and across different seasons. This means that outgoing shortwave radiation will vary depending on the time of day and the time of year.

Another important factor is the albedo, which refers to the reflectivity of different surfaces on Earth. Surfaces with high albedo, such as ice and snow, reflect more solar radiation back into space, resulting in lower outgoing shortwave radiation. Conversely, surfaces with low albedo, such as dark soil and vegetation, absorb more solar radiation, leading to higher outgoing shortwave radiation.

The presence of clouds also plays a role in outgoing shortwave radiation. Clouds can either reflect incoming solar radiation back into space or absorb and re-emit it as longwave radiation. The type and thickness of clouds, as well as their altitude, can affect the amount of outgoing shortwave radiation.

Finally, atmospheric gases such as water vapor, carbon dioxide, and ozone can also influence outgoing shortwave radiation. These gases absorb and re-emit some of the incoming solar radiation, impacting the amount of radiation that escapes back into space.

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Answer:

cubic measurements

Explanation:

i.e. cubic meter or cubic centimeter

The intensity of the wave is proportional to the square of the amplitude. so it becomes four times larger.

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Answer:

5

Explanation:

I don't remember very thing from this unit but I believe 5 makes it possible

         When molecules of the constituent components are not entirely mixed, this is referred to as a heterogeneous mixture. You could observe patches of one substance scattered among patches of another substance with the unaided eye or even under a microscope. The mixtures typically manifest as various phases or states of matter.

       The environment on a wet day serves as an illustration of a heterogeneous blend. Air, a gas, and liquid raindrops combine to create the wet atmosphere. Through the less thick air, there are spots of dense liquid water dropping. Due to the presence of two states, or phases, of matter—liquid and gas—it is clearly a heterogeneous mixture.

        Importantly, visibility is lowered on a rainy day. Because sunlight can move through air without being blocked, we can see through it. However, liquid raindrops bend, disperse, and block sunlight, preventing it from passing through the cloudy atmosphere.

         On the planet Earth, heterogeneous mixes make up the great bulk of substances.

        Below are many instances of typical heterogeneous mixtures.

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Answer: thinking

Explanation:

A mental disorder are ways of unusual feeling, or acting that are thinking. Therefore, option A is correct.

A clinically significant impairment in a person's intellect, emotional control, or behavior is what is known as a mental disorder. It is typically linked to distress or functional impairment in key areas.

Mental illness has many causes, not just one. Your genes and family history are only two examples of the many variables that can increase your risk for mental illness. Your life experiences, particularly if they occurred as a youngster, such as stress or a history of abuse.

Depression is the most prevalent mental condition, affecting an estimated 300 million individuals, and often affects women more frequently than males.

Thus, option A is correct.

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To infuse the loading dose of magnesium sulfate supplied as 4g in 250mL LR over 20 minutes, you would set the IV pump to an infusion rate of 750 mL/hr.

To calculate the mL/hr rate for infusing a loading dose of magnesium sulfate supplied as 4g in 250mL of LR (Lactated Ringer's) solution over 20 minutes, we need to convert the infusion time to hours and then determine the infusion rate.

First, let's convert the infusion time of 20 minutes to hours:

20 minutes = 20/60 hours = 1/3 hours (since there are 60 minutes in an hour).

Next, we can calculate the mL/hr rate using the following formula:

Infusion rate (mL/hr) = Total volume (mL) / Infusion time (hours)

In this case, the total volume is 250mL, and the infusion time is 1/3 hours.

Infusion rate (mL/hr) = 250mL / (1/3) hours

To divide by a fraction, we can multiply by the reciprocal of the fraction:

Infusion rate (mL/hr) = 250mL * (3/1) hours

Calculating the product:

Infusion rate (mL/hr) = 750mL/hr.

Therefore, to infuse the loading dose of magnesium sulfate supplied as 4g in 250mL LR over 20 minutes, you would set the IV pump to an infusion rate of 750 mL/hr.

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Answer:

Question says , the height of the student = 4 feet, ... This means, if the student goes for swimming in the pool, however he does not know swimming, he will not be drowned until he is suffering from an injury or external force.

The limiting reactant in the given reaction is Al, and the reactant in excess is \(CuSO_4\). The smaller amount is the amount of Al (1.4 grams), which makes it the limiting reactant.

In comparison, 95 mL of a 0.10 M   \(CuSO_4\) solution corresponds to a larger amount. Therefore, Al is the limiting reactant, and  \(CuSO_4\) is the reactant in excess. To determine the mass of Cu that should be produced on complete reaction of 1.4 g Al, we need to use stoichiometry. From the balanced equation, we can see that the ratio of Al to Cu is 2:3. This means that for every 2 moles of Al, we should produce 3 moles of Cu. First, we convert the mass of Al to moles using its molar mass. Then we use the mole ratio to calculate the moles of Cu. Finally, we convert the moles of Cu to grams using its molar mass.

Let's calculate it:

Given:

Mass of Al = 1.4 g

Molar mass of Al = 26.98 g/mol

Molar mass of Cu = 63.55 g/mol

First, calculate the moles of Al:

\(\[\text{{moles of Al}} = \frac{{\text{{mass of Al}}}}{{\text{{molar mass of Al}}}} = \frac{{1.4 \, \text{{g}}}}{{26.98 \, \text{{g/mol}}}} = 0.052 \, \text{{mol}}\]\)

According to the stoichiometry, the moles of Cu should be:

\(\[\text{{moles of Cu}} = \frac{{\text{{moles of Al}} \times 3}}{{2}} = \frac{{0.052 \, \text{{mol}} \times 3}}{{2}} = 0.078 \, \text{{mol}}\]\)

Finally, calculate the mass of Cu:

\(\[\text{{mass of Cu}} = \text{{moles of Cu}} \times \text{{molar mass of Cu}} = 0.078 \, \text{{mol}} \times 63.55 \, \text{{g/mol}} = 4.96 \, \text{{g}}\]\)

Therefore, the theoretical yield of Cu that should be produced from the complete reaction of 1.4 g Al is 4.96 grams.

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The formula contains : C. 1 nitrogen atom, 4 hydrogen atoms, and 1 chlorine atom

Given

NH₄Cl compound

Required

The number of atoms

Solution

The empirical formula is the smallest comparison of atoms of compound forming elements.  

A molecular formula is a formula that shows the number of atomic elements that make up a compound.

A molecular formula is composed of two or more elements formed of the same or different types.

A subscript indicating the number of atoms forming a molecule

So for NH₄Cl , there are 3 different elements, N, H and Cl, and the number is shown from the subscript

The overall energy change for the reaction is used to identify that the reaction is exothermic.

The combustion of ethene can be represented by the following chemical equation

C₂H₄ + 3O₂ → 2 CO₂ + 2 H₂O

the bond energies (in kJ/mol ) are

C-C 348

C=C 611

O=O 498

C=O 743

O-H 463

C-H 413

Reactants

C₂H₄    1 (C=C) + 4 (C-H) = 1(611) + 4(413) = 2455 kJ/mol

3O₂ 3 (O=O) = 3(498) = 1494 kJ/mol

Products

2 CO₂: 2 (C=O) + 4 (O=C) = 2(743) + 4(348) = 2642 kJ/mol

2 H₂O: 4 (O-H) = 4(463) = 1852 kJ/mol

Overall energy change

= Total energy of bonds broken - Total energy of bonds formed

= (2455 + 1494) - (2642 + 1852)

= -545 kJ/mol

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Participants in a tachistoscopic procedure were shown the sequence NaCl. Evidence suggests that they perceived the letters as separate entities rather than a word.

A tachistoscope is a device that briefly displays visual stimuli to test perception and recognition. In this particular procedure, the sequence nacl was presented. While NaCl is the chemical formula for table salt, evidence suggests that participants did not perceive it as a word, but rather as separate entities or letters. This phenomenon is known as a "word superiority effect," where letters are easier to perceive and recognize in the context of a word compared to when they are presented individually.

The participants' perception of NaCl as individual letters rather than a word suggests that their processing of the letters was more basic, lacking semantic and contextual understanding. This procedure and its results can be useful in understanding how our brain processes visual stimuli and how our perception and recognition can be affected by various factors.

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The magnitude of the force acting on the body is 4000 Newtons.

To find the magnitude of the force, we can use Newton's second law of motion, which states that the force applied to an object is equal to the product of its mass and acceleration.

The given information includes the mass of the body (80 kg) and the resulting velocity (10 m/s). However, since the time duration (0.2 seconds) is also provided, we can use it to calculate the acceleration of the body.

The formula to calculate acceleration is:

Acceleration = Change in Velocity / Time

The change in velocity can be calculated by subtracting the initial velocity (which is 0 m/s as the body is at rest) from the final velocity:

Change in Velocity = Final Velocity - Initial Velocity

Change in Velocity = 10 m/s - 0 m/s

Change in Velocity = 10 m/s

Now, we can calculate the acceleration:

Acceleration = Change in Velocity / Time

Acceleration = 10 m/s / 0.2 s

Acceleration = 50 m/s²

Finally, we can calculate the magnitude of the force using Newton's second law:

Force = Mass x Acceleration

Force = 80 kg x 50 m/s²

Force = 4000 N

Therefore, the magnitude of the force acting on the body is 4000 Newtons.

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