All surfaces have texture, which means it affects how things move over it. When it takes a long time for friction to slow down an object, what is most likely true about the surface the object is moving on? The surface is dry. The surface is rough. The surface is uneven. The surface is smooth.

Neil Bohr used the fluorescent screen and an alpha particle detector to study the structure of an atom.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

The atom as a whole is neutral and stable due to presence of oppositely charged particles.

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Explanation: I don't have an answer, as this seems to be a multiple choice, without any choices given, however, the four main ingredients essential to making beer is water, yeast, barley, and hops. If this doesn't answer your question, some ingredients included in beer, but not needed, is orange peels, cinnamon, and berries/fruits.

Comment on this if you need further information, if this didn't answer your question!

A coffee cup temperature  with a heat capacity of 6. 70 J/∘ C was used to measure the change in enthalpy of a precipitation reaction.The value of ΔHrxn was found to be 61.9 kJ/mol.

Calculate the enthalpy of reaction, ΔHrxn, per mole of precipitate formed (AgSCN). Assume the specific heat of the product solution is 4. 11 J / (g⋅∘C) and that the density of both the reactant solutions is 1. 00 g/mL.1. Calculation of Moles of precipitate formed from AgNO3:To find the value of ΔHrxn, we used the formula ΔHrxn = Qsolution/n, where Qsolution is the heat change produced by the solution process and n is the number of moles of AgSCN formed.

To find the value of n, we first calculated the number of moles of AgNO3 and KSCN used in the reaction using the formula n = M × V.To find the heat change produced by the solution process, we used the formula

Q = m × c × ∆T,

where Q is the heat change, m is the mass of the product solution, c is the specific heat capacity of the product solution, and ∆T is the change in temperature of the solution.The value of ΔHrxn was found to be 61.9 kJ/mol.

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Answer:

Blank 1 - Microscope

Blank 2 - Cell Theory

Explanation:

Answer:

microscope. and cell theory

Explanation:

with the invention of the microscope. scientists were able to create cell theory

The value of the Q-system is Zero.

The Q-System is a rock mass classification system related to the stability of underground openings. Q-System was originally developed at NGI and is widely used in Norway and internationally. service. The Q value of undisturbed mountains can fluctuate. The Q-System is a rock mass classification system related to the stability of underground openings.

Based on the estimation of six rock parameters the Q value of rocks can be calculated. This value represents the quality of the rock. Rock quality designation RQD is a rough measure of the degree of fracturing or fracturing of rock masses measured as the percentage of drill cores that are 10 cm or longer in length. High-quality rocks have an RQD greater than 75% and low-quality rocks less than 50%. There are several definitions of lithology designation RQD.

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Answer:

B) a substance's color and odor changed        Explanation: A signal that a chemical change has occurred is when its odor (its smell) or its appearance has changed.

Answer:

Total ionic equation = Ni²⁺ + 2Cl⁻¹ + 2Na⁺ + CO₃⁻² → 2Na⁺ + 2Cl⁻¹ + NiCO₃ (s)

Net ionic equation = Ni²⁺ + CO₃⁻² → NiCO₃ (s)

NiCl₂ (aq) + Na₂CO₃ (aq) → 2NaCl (aq) + NiCO₃ (s)

First, we'll need to expand the complete chemical equation into a total ionic equation (to determine whether a chemical is aqueous or solid, use a solubility chart until the rules are memorized).

Ni²⁺ + 2Cl⁻¹ + 2Na⁺ + CO₃⁻² → 2Na⁺ + 2Cl⁻¹ + NiCO₃ (s)

Now, using the total ionic equation, we can find the net ionic equation. In order to do this, we need to cancel out the aqueous solutions that don't form into solids, as they are extraneous.

Ni²⁺ + 2Cl⁻¹ + 2Na⁺ + CO₃⁻² → 2Na⁺ + 2Cl⁻¹ + NiCO₃ (s)

Ni²⁺ + CO₃⁻² → NiCO₃ (s)

I hope this helped!

The pH of a solution of 150 mL of 0.1 M Tris-Hydrochloride is 1.

To determine the pH of a solution of 150 mL of 0.1 M Tris-Hydrochloride, you need to use the following equation:
pH = -log[H+]
Where [H+] is the concentration of hydrogen ions in the solution. In this case, the concentration of hydrogen ions is 0.1 M.
So, to calculate the pH of the solution, you simply plug the concentration of hydrogen ions into the equation:
pH = -log[0.1]
pH = -(-1)
pH = 1

Therefore, the pH of a solution of 150 mL of 0.1 M Tris-Hydrochloride is 1.
It's important to note that Tris-Hydrochloride is a buffer, meaning that it resists changes in pH. This means that the pH of the solution will remain relatively constant, even if small amounts of acid or base are added. This is useful in many biological and chemical applications, as it allows for more consistent and reliable results.

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In conclusion, d. Arginine is the amino acid with the highest isoelectric point, at 10.76.

The amino acid that has its isoelectric point at the highest pH is d. Arginine. An amino acid is an organic compound that contains both an amino (-NH2) and a carboxyl (-COOH) functional group. It also has a side chain (R group) that is unique to each of the 20 different amino acids.

The isoelectric point (pI) is the pH at which the amino acid has a net zero charge. This is the pH at which it does not migrate in an electric field. An amino acid is positively charged when the pH is less than the pI and negatively charged when the pH is greater than the pI.

Arginine is an amino acid that has a positively charged guanidine group in its side chain. It is an essential amino acid, which means that the body cannot synthesize it and must obtain it from food. The isoelectric point of arginine is 10.76, which is higher than that of the other amino acids listed:

Lysine has a pI of 9.74

Histidine has a pI of 7.59

Threonine has a pI of 5.6

Alanine has a pI of 6.11

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Answer:

Explanation:

This is an aluminum atom with 13 proton because from what henry said in the year 1914 he said that the number of protons of an element is equal to the number of electrons for an neutral atom..an you expect the number of electrons to be the atomic number.( The number that is used to locate the elements in the periodic table (1869).

And the number of neutron is 13 because form the mass number of the elements and we no that the mass number of an element is the sum of the proton and the neutron..MN=P + N.....so when 13 is substracted from 27 the answer is 14. So the answer is option D.

Answer:

1. Zinc

Zinc also plays a vital role in our body because it is the main component of all cells and also provides protection against microbes. It is also needed for the production of DNA and protein. Zinc is good to take when you are feeling sick with a cold or even a sore throat. But Zinc in excess amount can cause copper deficiency, upset stomach aches, and diarrhea

2.Iron

Iron is a major component of hemoglobin which is responsible for the transportation of oxygen from the lungs to all cells of the body. Women take to iron a lot to give them energy after childbirth because they become iron deficient. Iron in excess can have a negative effect on our body such as it causes liver disease (cirrhosis, cancer), heart attack, diabetes and sometimes it causes death.

Explanation:

a. The pH of 0.150 M acrylic acid is 4.25, indicating an acidic solution.

b. The percent dissociation of 0.0500 M acrylic acid is approximately 3.56%.

a. To calculate the pH and concentrations of all species in 0.150 M acrylic acid, we need to consider the dissociation of the acid. Acrylic acid (HC₃H₃O₂) dissociates into its conjugate base (C₃H₃O₂⁻) and hydronium ion (H₃O⁺).

pKa of acrylic acid = 4.25

Initial concentration of acrylic acid (HC₃H₃O₂) = 0.150 M

Using the Henderson-Hasselbalch equation:

pH = pKa + log([C₃H₃O₂⁻] / [HC₃H₃O₂])

First, we need to calculate the concentrations of C₃H₃O₂⁻ and HC₃H₃O₂.

At equilibrium, the concentration of C₃H₃O₂⁻ is equal to the concentration of dissociated acrylic acid, so [C₃H₃O₂⁻] = [HC₃H₃O₂].

Using the equilibrium expression:

Ka = [C₃H₃O₂⁻][H₃O⁺] / [HC₃H₃O₂]

Since Ka = 10^(-pKa), we can substitute the values:

10^(-pKa) = [C₃H₃O₂⁻][H₃O⁺] / [HC₃H₃O₂]

10^(-4.25) = [C₃H₃O₂⁻][H₃O⁺] / [HC₃H₃O₂]

0.0000562341 = ([HC₃H₃O₂]^2) / [HC₃H₃O₂]

[HC₃H₃O₂] = 0.0075 M

Since [C₃H₃O₂⁻] = [HC₃H₃O₂], [C₃H₃O₂⁻] = 0.0075 M

Now, we can calculate the pH:

pH = pKa + log([C₃H₃O₂⁻] / [HC₃H₃O₂])

pH = 4.25 + log(0.0075 / 0.0075)

pH = 4.25

Therefore, the pH of 0.150 M acrylic acid is 4.25, indicating an acidic solution.

b. To calculate the percent dissociation (percent ionization) in 0.0500 M acrylic acid, we need to determine the concentration of dissociated acrylic acid ([C₃H₃O₂⁻]) at equilibrium.

Initial concentration of acrylic acid (HC₃H₃O₂) = 0.0500 M

Concentration of dissociated acrylic acid ([C₃H₃O₂⁻]) = x (unknown)

Using the equilibrium expression:

Ka = [C₃H₃O₂⁻][H₃O⁺] / [HC₃H₃O₂]

Substituting the known values:

10^(-4.25) = x^2 / (0.0500 - x)

To solve this equation, we can make the assumption that x is small compared to 0.0500 M. This allows us to approximate the concentration of undissociated acrylic acid (HC₃H₃O₂) as 0.0500 M. Therefore, we can simplify the equation:

10^(-4.25) ≈ x^2 / 0.0500

Solving for x, we have:

x^2 ≈ 0.0500 * 10^(-4.25)

x^2 ≈ 3.1623 * 10^(-6)

x ≈ √(3.1623 * 10^(-6))

x ≈ 0.00178 M

The concentration of dissociated acrylic acid is approximately 0.00178 M.

Now, we can calculate the percent dissociation:

Percent dissociation = ([C₃H₃O₂⁻] / [HC₃H₃O₂]) * 100

Percent dissociation = (0.00178 / 0.0500) * 100

Percent dissociation ≈ 3.56%

Therefore, the percent dissociation (percent ionization) of 0.0500 M acrylic acid is approximately 3.56%.

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Critical mass is the amount of a radioactive element required to sustain a chain reaction.

The term used to describe the amount of a radioactive element required to sustain a chain reaction is "critical mass." Critical mass is a term used in nuclear physics that refers to the minimum mass of fissionable material needed to maintain a self-sustaining nuclear chain reaction. A chain reaction occurs when a neutron hits a nucleus, which then splits and releases more neutrons, leading to a cascade of nuclear reactions. Critical mass is determined by various factors such as the physical and chemical properties of the fissile material, its shape, temperature, and density. If too little of a fissile material is present, the neutrons will escape, and the reaction will stop.

If too much material is present, the reaction will become uncontrollable and lead to a nuclear explosion. Critical mass refers to the smallest amount of fissile material required to maintain a chain reaction. In order for a chain reaction to occur, a certain number of neutrons must be present. This number of neutrons is known as the neutron population, and it must be maintained at a certain level to keep the reaction going. This is accomplished by carefully controlling the amount of fissile material that is present. If there is too little fissile material, the neutron population will quickly drop below the critical level, and the reaction will stop.

If there is too much fissile material, the neutron population will grow uncontrollably, leading to a nuclear explosion. In order to maintain a chain reaction, the fissile material must be in a critical state, meaning that the neutron population remains constant over time. This is achieved by controlling the geometry of the fissile material, as well as its temperature and density. If any of these parameters change, the critical state will be lost, and the reaction will either stop or become uncontrolled. Therefore, critical mass is a crucial concept in the design and operation of nuclear reactors and weapons.

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The electronegativity periodic table is a chart that arranges elements according to their electronegativity, which is a measure of an atom's ability to attract electrons to itself. Electronegativity is a chemical property that reflects the relative tendency of an atom to draw electrons towards itself when it forms a chemical bond with another atom.

The electronegativity values are usually determined using the Pauling scale, which was developed by Linus Pauling and is widely used in chemistry. In this scale, the electronegativity of an element ranges from 0.7 for cesium to 4.0 for fluorine, with increasing electronegativity moving from left to right across a period and increasing as one moves down a group.

The electronegativity values can be useful in understanding chemical bonding and the behavior of molecules. For example, elements with high electronegativity values tend to form ionic bonds, while elements with low electronegativity values tend to form covalent bonds. Additionally, the electronegativity difference between two bonded atoms determines the type of bond, with larger differences indicating polar covalent bonds and smaller differences indicating nonpolar covalent bonds.

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Answer:

1.T

2.I

Explanation:

hope it help

#carry on learning

The object and description that matches is Object 2 and T.

Object 1 has no matching description.

A Fish aquarium filter is a filter whose function is to clean the water of debris, removes the toxic buildup of ammonia and nitrates, and aerates the water so that fish can in a conducive environment and breathe properly

An engine oil filter is a filter whose function is to filter and remove contaminants that may be present in the engine oil, transmission oil, lubricating oil, or hydraulic oil in order for proper functioning of the engine.

Therefore, the object and description that matches is Object 2 and T.

Object 1 has no matching description.

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Warm, dark, and poorly-ventilated locations are generally not suitable for chemical storage. it can be stored in cool places most of the time.

In general, a location suitable for chemical storage should be:

Cool: Many chemicals are temperature-sensitive and can degrade or react with other substances if exposed to high temperatures.

Dry: Moisture can cause some chemicals to react or degrade, and can also increase the risk of fire or explosion if electrical equipment is present.

Well-ventilated: Proper ventilation is important to ensure that fumes or vapors generated by the chemicals are safely dispersed.

Away from sources of heat and ignition: Chemicals should be stored away from sources of heat, sparks, and flames, to minimize the risk of fire or explosion.

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Complete question:

in general, which characteristics are necessary for a location to be suitable for chemical storage? select one or more:

A. Warm

B. Dark

C. Dry

D. Poorly-ventilated cool

Answer:

22

Explanation:

3x4+  5x2

Answer:

c. the center of curvature of the two sides of the lens

Answer:

B

Explanation:

Answer:

The gold foil experiment

El experimento de la lámina de oro

Explanation:

When an organism dies, bacteria degrade it. During the decomposition process, carbon dioxide is emitted into the environment or water. Hence, it has no impact on the decomposers.

When animals breathe or decay (decompose), carbonate rocks are worn, forest fires happen, and volcanoes erupt, carbon dioxide is naturally released into the atmosphere.

Thus, even during process of cellular respiration, carbon dioxide is expelled into the atmosphere.  Hence, it has no impact on the decomposers.

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Acids and bases are chemical substances with contrasting properties. Acids taste sour, turn litmus paper red, and have a low pH. Bases taste bitter, turn litmus paper blue, and have a high pH. When an acid and a base react, they form a salt and water, resulting in a neutral solution.

Acids and bases are fundamental concepts in chemistry. Acids have a sour taste, such as vinegar or lemon juice, and turn litmus paper red. They also have a low pH value, indicating a high concentration of hydrogen ions (H+). On the other hand, bases have a bitter taste, like soap or baking soda, and turn litmus paper blue.

Bases have a high pH value, indicating a low concentration of hydrogen ions and a higher concentration of hydroxide ions (OH-). When an acid and a base react, they undergo a neutralization reaction, resulting in the formation of a salt and water. The salt is composed of a cation from the base and an anion from the acid. The resulting solution is neutral, with a pH of 7. Examples of salts include sodium chloride (table salt) and calcium carbonate (chalk). Alkalis are a type of base that can dissolve in water, forming hydroxide ions.

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Answer:

An exothermic reaction is defined as a reaction that releases heat and has a net negative standard enthalpy change. Examples include any combustion process, rusting of iron, and freezing of water.

Explanation:

An exothermic reaction is defined as a reaction that releases heat and has a net negative standard enthalpy change. Examples include any combustion process, rusting of iron, and freezing of water.

The combustion is an example of an exothermic reaction.

An exothermic reaction is a reaction that releases energy, this energy is usually in the form of heat. An endothermic reaction is a reaction that absorbs energy to take place.

Analyzing the given reactions we have that:

So, the combustion is an example of an exothermic reaction.

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a liquid whose adhesive forces are stronger than its cohesive forces in the left. Bulk (or macroscopic) characteristics are connected to cohesive and adhesive forces.

Therefore, when discussing atomic and molecular qualities, the phrases are not appropriate. Both cohesive and adhesive forces act on a liquid when it comes into touch with a surface (such the tabletop or the walls of a graduated cylinder). The form that the liquid assumes is controlled by these forces. Wetting is the process of a liquid on a surface spreading out to create a thin, essentially homogeneous film across the surface due to the effects of adhesive forces.As an alternative, the liquid can separate into a number of tiny, approximately spherical beads that stand on the surface and make minimal contact with it when strong cohesive forces are present. Also known as "adhesive forces," they include mechanical forces (which cause objects to adhere together) and electrostatic forces (attraction due to opposing charges). Also known as "adhesive forces," they include mechanical forces (which cause objects to adhere together) and electrostatic forces (attraction due to opposing charges)

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Answer:

cater pillars piutyiry 6 throid gland

Answer:

1. how does sweat get to the sweat glands

Sweat gets to the sweat glands by passing through ducts

2. what hormone helps us react to danger

Adrenaline

#. how many glands are part of the endocrine system?

8

4. What gland is located in the middle of the forehead and regulates the growth of bones?

The pituitary gland.

Explanation:

Organic compounds;

Inorganic molecules;

An organic molecule are the molecules that contain long chains of carbon and are studied as part of organic chemistry. Inorganic compounds do not contain catenated carbon chains and are studied as part of inorganic chemistry.

Let us now classify the compounds;

Organic compounds;

Inorganic molecules;

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