A 98. 5°C metal bolt is placed in a calorimeter of 23. 1°C water. Which way will the heat energy flow?

Answer:

B: Presence of ashes

Explanation:

Burning molecules turns them into other molecules

Answer:B

Explanation:

Materials such as concrete, bricks and tiles absorbs and store more heat as compared to materials such as timber and cloth which have low thermal masses.

Thermal mass in floors is most effective. In most of the climate conditions a concrete slab which is insulated underneath and around the edge and where it is in direct contact with the ground absorbs more energy and thus it is the most effective way to increase thermal mass.

Thermal mass refer to the property of construction materials to absorb, store, and release heat energy.

Water also have high thermal mass.

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Answer

C₄H₆O₄

Explanation

Given:

The empirical formula of the compound is C₂H₃O₂

The molecular mass of the compound = 118.054 g/mol

To get the molecular formula of the compound, you need to know the actual number of atoms of each element by equating the empirical formula to the molecular mass as follows:

From the Periodic Table:

Molar mass of H = 1.00784 g/mol

Molar mass of O = 15.999 g/mol

Molar mass of C = 12.0107 g/mol

Hence, the molecular formula of the compound is:

Cobalt-60 is a radioisotope that decays by first order kinetics with a half life of 5. 26 years. When used in radiotherapy, a cobalt-60 unit is replaced when the concentration of co decreases to 75% of its initial value it occurs in 2.18 years.

Given that :

t1/2 = 5.26 years

k t1/2 = 0.693

k = 0.693 / 5.26

k = 0.132 yr^-1

ln ([A]t / [A]o) = - kt

[ Co ] = 0.75 [Co]

ln ( 0.75 [Co] / [Co]o) = - (0.132 yr^-1) t

ln 0.75 = - (0.132 yr^-1) t

-0.288 = - (0.132 yr^-1) t

t = - 0.288 / - (0.132 yr^-1)

t = 2.18 yr

Thus, Cobalt-60 is a radioisotope that decays by first order kinetics with a half life of 5. 26 years. When used in radiotherapy, a cobalt-60 unit is replaced when the concentration of co decreases to 75% of its initial value it occurs in 2.18 years.

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The statement that describes what will happen to pH as hydrogen ion concentration increases is: "pH will decrease."

The pH of a solution is a measure of its acidity, and it is defined as the negative logarithm of the hydrogen ion concentration (H+). As the hydrogen ion concentration increases, the pH of the solution decreases, indicating an increase in acidity. Conversely, as the hydrogen ion concentration decreases, the pH increases, indicating a decrease in acidity.

The pH scale is a measure of the acidity or basicity (alkalinity) of a solution. It ranges from 0 to 14, with 7 being neutral. Solutions with a pH less than 7 are considered acidic, while solutions with a pH greater than 7 are considered basic or alkaline.

The hydrogen ion concentration (H+) of a solution is an important factor in determining its pH. As the concentration of hydrogen ions increases, the solution becomes more acidic, and the pH decreases. Conversely, as the concentration of hydrogen ions decreases, the solution becomes less acidic, and the pH increases.

It's important to understand the pH of solutions because it can have a significant impact on chemical reactions and biological processes. For example, the pH of the human body is carefully regulated, and deviations from the normal pH range can lead to serious health problems. Similarly, the pH of soil, water, and other environments can have a profound effect on the survival and growth of plants, animals, and microorganisms.

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Answer:

Falso

Explanation:

La electrólisis es la descomposición de una solución cuando la corriente continua se pasa a través de ella.

La corriente entra y abandona el electrolito a través de los electrodos. El electrodo positivo se llama el ánodo mientras el electrodo negativo se llama cátodo.

Los iones positivos se mueven hacia el cátodo, mientras que los iones negativos se mueven hacia el ánodo.

Dado que el cloruro es un ion negativo, se mueve hacia el ánodo y no hacia el cátodo.

Answer:

Your answer will be C. 1/32

Answer:

C. 1/32

Explanation:

Two ways that stress could negatively impact a students performance is by causing them to procrastinate. When you're stressed, you tend to keep putting things off because you "just can't deal with it" at the moment. This could cause the student to turn in their assignments late (or not at all) and cause their grades to drop. Additionally, when you're stressed, it's harder to fall asleep, and once you are, you don't sleep as well. Sleep deprivation can greatly affect a student's in class performance by causing them to fall asleep in class, or not pay attention as well.

Answer:

D

Explanation:

hi! a chemical change changes the composition of the material. in A, even though the glass is broken, it is still glass. for B, even though the wood is chopped, it is still wood. for C, even though the can is crushed, it is still a can. D is a chemical change because the milk's taste changes, meaning its chemical composition changed and a reaction occurred. it is no longer the original milk.

The event represents a chemical change is milk turning sour. Hence option D is correct.

Chemical change is defined as a transformation of one material into another, the formation of new materials with distinct properties, and the creation of one or more new substances. Chemical synthesis, or, alternatively, chemical breakdown into two or more separate molecules, occurs when one material reacts with another to create a new substance.

In the case of milk, it contains a sugar called lactose as well as lactobacillus, a type of bacteria that is completely safe and uses the lactose to produce energy and lactic acid. This is what gives milk its sour flavor. When the taste of the milk changes, a chemical reaction has taken place, changing its chemical makeup. It isn't the original milk anymore.

Thus, the event represents a chemical change is milk turning sour. Hence option D is correct.  

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Using a micropipette, pipette 12 µL of the stock solution into the second labeled tube.5. Add 18 µL of nuclease-free water to the second labeled tube to bring the total volume up to 30 µL. This will give a final concentration of 250 ng/µL.

RNA or Ribonucleic acid is the genetic material that helps to transfer genetic information from DNA to protein synthesis. It is essential in decoding and regulation of genes. RNA isolation is the process of extracting RNA molecules from biological samples.The given formula C1V1

= C2V2 states that the concentration (C1) and volume (V1) of the initial solution is equal to the concentration (C2) and volume (V2) of the final solution. This means that the amount of solute (in this case, RNA) before and after dilution is the same. The formula can be used to calculate the volume of the stock solution required to prepare a dilution of a specific concentration.1. Label two new 1.5 mL microfuge tube with your name and RNA sample. Close the lids on them.2. Using a micropipette, pipette 30 µL of your RNA sample into one of the labeled tubes.3. Using the formula C1V1

= C2V2, we can calculate the volume of stock solution required to prepare the dilution.C1

= initial concentration

= unknown V1

= initial volume

= 30 µL (the volume we pipetted)C2

= final concentration

= 250 ng/µLV2

= final volume

= unknown (what we need to find)We can rearrange the formula to solve for V2:V2

= C1V1/C2V2

= (C1V1)/C2V2

= (100 ng/µL × 30 µL) ÷ 250 ng/µLV2

= 12 µL4.

Using a micropipette, pipette 12 µL of the stock solution into the second labeled tube.5. Add 18 µL of nuclease-free water to the second labeled tube to bring the total volume up to 30 µL. This will give a final concentration of 250 ng/µL.

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Answer:

Explanation:

Here, we want to check if the equation of the reaction is balanced or not

Now, for a balanced equation of reaction, the number of atoms of the individual elements on both sides of the equation is equal

Now, let us check the atoms:

We have 1 Sr on both sides

We have 1 SO4 on both sides

We have 1 Mg on both sides

We have 2 OH on both sides

From what we can see, the equation of the reaction is balanced

Thus, the correct answer choice is B

Until all of the ice has melted, the mixture's temperature doesn't change at all; after that, it starts to rise steadily.

The average energy of every molecules and atoms in a substance is what chemists refer to as the substance's temperature. The kinetic energy of a substance's constituent particles varies.

Temperature is a unit used to represent hotness or coolness on any of a number of scales, including F and Celsius. According to temperature, heat energy will naturally move from a hotter (body with a warmer pressure) to a colder (body with a temperature lower) .

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Answer:

a) 1s22s22p63s1

b) 3s² 3p¹

c) 1s22s22p63s23p3

d) 3s² 3p⁵

e) 3s2

f) 1s22s22p63s23p2

g) 1s22s22p63s23p4

h) 3s² 3p⁶

Answer:

There are three major classifications of substances known as acids or bases. The Arrhenius definition states that an acid produces H+ in solution and a base produces OH-. This theory was developed by Svante Arrhenius in 1883. Later, two more sophisticated and general theories were proposed. These are the Brønsted-Lowry and the Lewis definitions of acids and bases. The Lewis theory is discussed elsewhere.

The Arrhenius Theory of Acids and Bases

In 1884, the Swedish chemist Svante Arrhenius proposed two specific classifications of compounds; acids and bases. When dissolved in an aqueous solution, certain ions were released into the solution. An Arrhenius acid is a compound that increases the concentration of H+ ions that are present when added to water. These H+ ions form the hydronium ion (H3O+) when they combine with water molecules. This process is represented in a chemical equation by adding H2O to the reactants side.

HCl(aq)→H+(aq)+Cl−(aq)(1)

In this reaction, hydrochloric acid ( HCl ) dissociates completely into hydrogen (H+) and chlorine (Cl-) ions when dissolved in water, thereby releasing H+ ions into solution. Formation of the hydronium ion equation:

HCl(aq)+H2O(l)→H3O+(aq)+Cl−(aq)(2)

The Arrhenius theory, which is the simplest and least general description of acids and bases, includes acids such as HClO4 and HBr and bases such as NaOH or Mg(OH)2 . For example the complete dissociation of HBr gas into water results generates free H3O+ ions.

HBr(g)+H2O(l)→H3O+(aq)+Br−(aq)(3)

This theory successfully describes how acids and bases react with each other to make water and salts. However, it does not explain why some substances that do not contain hydroxide ions, such as F− and NO−2 , can make basic solutions in water. The Brønsted-Lowry definition of acids and bases addresses this problem.

An Arrhenius base is a compound that increases the concentration of OH- ions that are present when added to water. The dissociation is represented by the following equation:

NaOH(aq)→Na+(aq)+OH−(aq)(4)

In this reaction, sodium hydroxide (NaOH) disassociates into sodium (Na+) and hydroxide (OH-) ions when dissolved in water, thereby releasing OH- ions into solution.

A probing question that lies within the scope of physics could be: "What is the nature of dark matter and dark energy, and how do they influence the expansion of the universe?

Dark matter and dark energy are hypothetical forms of matter and energy that are believed to exist based on their observed gravitational effects on galaxies and the expansion of the universe.

Dark matter is thought to be a type of matter that does not interact with light or other electromagnetic radiation, while dark energy is an unknown form of energy that is causing the universe to expand at an accelerated rate.

Exploring the nature of dark matter and dark energy falls under the purview of physics because it involves understanding the fundamental forces and particles that govern the behavior of the universe.

Physicists study these phenomena by analyzing the gravitational effects they have on visible matter, conducting experiments to detect dark matter particles, and developing theoretical models to explain their properties and interactions.

Addressing this probing question requires the application of various branches of physics, such as cosmology, astrophysics, particle physics, and quantum mechanics.

Researchers employ observational data, theoretical frameworks, and advanced technologies to investigate the nature and origin of dark matter and dark energy, contributing to our understanding of the fundamental nature of the universe and its evolution.

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Answer:

Ba

Explanation:

Atomic radius increases going right to left, and up to down.

So the closest element to the bottom left corner is Ba.

Michelle Johnston says lionfish are the most sustainable fish you can order on a menu because they are an invasive species.

In the article "On the hunt for answers" Dr. Michelle Johnston explains that the lionfish is an invasive species and due to this, this species represents a threat to the ecosystems and the native species living in it.

Due to these implications, she promotes the idea of a removal cruise that collects and studies this species. Moreover, she supports the idea of hunting them to control the population numbers.

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Compound B should raise more safety concerns than compound A because the vapour pressure of the bottle of the liquid with a low boiling point will be higher than that of the liquid with a high boiling point.

The average energy of the particles present increases as the temperature rises. That implies that a greater number of them are probably energetic enough to break off from the liquid's surface. The vapour pressure will likely rise as a result.

Types of Molecules: A solid's or liquid's vapour pressure is determined by the kinds of molecules that make up the substance. The vapour pressure will be relatively low if the intermolecular interactions between molecules are quite strong. The vapour pressure will be high since the substance is relatively weak.

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Answer:

C. trigonal Planar

Explanation:

Tetrahedral is 4 connected

Bent is 2 connected with a lone pair

Linear is 2 connected in a line

Trigonal Planar is the one with 3 connected.

Answer:

C: Trigonal Planar

Explanation:

Tetrahedral is four connected

Bent is 2 linked with a lone pair

Linear is two connected in a line

Trigonal Planar is the one with 3 connected.

The orbital diagram shows us the number of electrons that can be found in the atom.

We know that the orbital is a region in pace where there is a high probability of finding the electron. We also know that the filling of the electrons into the respective orbitals where they fall in can be done by the use of the Aufbau principle.

According to the Aufbau principle, it is clear that in the filling of the electrons into the orbitals, the orbitals that are lesser in energy are first filled. The orbitals that are lesser in energy are always found quite close to the nucleus.

This implies that the relative energies of the orbitals would tend to increase as we move away from the nucleus. In other words, the nucleus is the part of the atom that would be at the lowest energy. The orbital diagram of iron by the use of the Aufbau principle have been shown in the image attached to this answer.

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The ΔT for both Aluminum and water is 55.5 °C and 12°C respectively.

The specific heat capacity is defined as the quantity of heat required to increase the temperature in 1 unit of substance by  1 °C.

Whenever the heat is lost or absorbed the substance's temperature will be changed:

Q = mCΔT

Given, the amount of energy added, Q = 500 J

The specific heat capacity of water, C = 4.184 J/g°C

The change in temperature of the water can be calculated as:

500 = 10 × (4.184 J/g°C) × ΔT

ΔT = 12°C

The amount of energy added, Q = 500 J

The specific heat capacity of the aluminum is C = 0.9 J/g°C

The change in temperature of the aluminum can be calculated as:

500 = 10 × (0.9 J/g°C) × ΔT

ΔT = 55.5°C

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Answer:

me

Explanation:

Answer:

If you're doing good for an assignment and quiz, then you can pass the grade quarter.

Explanation:

West to east direction the Sun appear to move across the sky.

The correct option is West to east.

The Sun, Moon, planets, and stars all rise in the east and travel westward across the sky because Earth rotates or spins in an eastward direction.

Start by pointing your left arm in the direction of the sun in the morning to get a sense of where north, south, east, and west are. Caitlin Dempsey is pictured. Now extend your right hand in the direction of the west. Your back is to the north and you are now looking south.

The four principal compass directions are known as the four cardinal directions, or cardinal points. They are north, east, south, and west, and are typically represented by the initials N, E, S, and W, respectively.

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Answer:

It is false

Explanation:

ph value below 7 are acidic, and ph values above 7 are alkaline (basic)

Answer:30 moles of oxygen are required if 12 moles of  are consumed.

Explanation:The given balanced equation is:

From this balanced equation, there is 2:5 mol ratio between  and  .

We are asked to calculate the moles of  required to react with 12 moles of .

It's a mol to mol conversion and the set up for this would be as:

=

So, 30 moles of oxygen are required to react with 12 moles of  .

The conversions are 2000 mg to g id 2 g, 5 ml to l is 0.005 l, 104 km to m is 104000 m, 198 g to kg is 0.198 kg, 2500 m to km is 2.5 km, 75 ml to l is 0.075 l, 65 g to mg is 65000 mg, 5.6 kg to g is 5600 g,8 mm to dm is  0.0008 dm, 5.6 m to cm is 560 cm and 120 dag to dg is  12000 dg.

Conversion is defined as a client action that is performed on your website and is tracked by conversion rate.

1 mg = 0.001 g

1 L = 1000 ml

1 km = 1000 m

1 g = 0.001 kg

1 mm = 0.0001 dm

1 m = 100 cm

1 dag = 100 dg

Thus, the conversions are 2000 mg to g id 2 g, 5 ml to l is 0.005 l, 104 km to m is 104000 m, 198 g to kg is 0.198 kg, 2500 m to km is 2.5 km, 75 ml to l is 0.075 l, 65 g to mg is 65000 mg, 5.6 kg to g is 5600 g,8 mm to dm is  0.0008 dm, 5.6 m to cm is 560 cm and 120 dag to dg is  12000 dg.

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MnO4- acts as an oxidizing agent, whereas SO2 acts as a reducing agent.

An oxidizing agent is a chemical species that causes oxidation in another substance by receiving electrons from it. To put it another way, it is a chemical that makes it easier for electrons to move from the object being oxidized to itself.

When an oxidation occurs, electrons are lost or the oxidation state is increased; when a reduction occurs, electrons are gained or the oxidation state is decreased.

In this equation, MnO4- + SO2 + H2O → Mn2+ + SO42- + 2H+

Because it causes SO2 to undergo oxidation (i.e., lose electrons) and goes through reduction itself, MnO4- is the oxidizing agent in this equation (i.e., gains electrons).

Due of its ability to both reduce MnO4- and oxidize itself, SO2 is the reducing agent.

Mn2+ is not an oxidizing agent because it is the end result of the reduction of MnO4-.

As SO42- is a byproduct of SO2 oxidation, it cannot act as a reducing agent.

MnO4- is therefore the oxidizing agent, whereas SO2 is the reducing agent.

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Answer:

The electron structures of the group 14 (4A) elements are similar in that they are all part of the carbon group. Thus, they each have 4 electrons in their valence shell. Also, most of these elements are found in our daily lives except germanium. They are different in that their properties differ greatly despite them being somewhat alike.

Explanation:

I hope this helps! I took this class last year.