A 32.5 g sample of metal X require 659 J of energy to heat it from 10°C to 77°C calculate the specific heat capacity of metal X. Round your answer to significant figures.

3.35 J/g °C
0.303 J/g °C
2170 J/g °C
169 J/g °C

Answer:

B

Explanation:

Chromium (Cr) is a member of  transition metals family, so the correct answer is E none of these.

Usually transition metals are strong and hard elements. Both the melting and boiling points of these metals are high. Transitional metals family are versatile materials that can be hammered, bent, and drawn into wires. They also carry heat and electricity effectively. These metals' atoms have a strong attraction to one another. They are typically glossy as well.

The chemical element chromium has the atomic number 24 and the symbol Cr. It is the group 6's first element. It is a transition metal family that is steely-grey, glossy, tough, and brittle.

The great corrosion resistance and hardness of chromium metal make it valuable. The discovery that steel could be rendered extremely resistant to corrosion and discoloration by adding metallic chromium to make stainless steel was a significant advancement in the production of steel. 85% of commercial use is made up of stainless steel with chrome plating (electroplating with chromium). Chromium is highly prized for its ability to be finely polished while remaining tarnish-resistant. Nearly 70% of the visible spectrum and approximately 90% of infrared light are reflected by polished chromium.

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O2- Option B is correct

Explanations:

Calcium atom is a group 2 elements that gives out two electrons in order to form a stable configuration and a Ca2+ ion. These two electrons are transferred to an atom that required two electrons to complete its outer shell.

Since oxygen required 2 electron to attain its octet configuration, hence they can easily accepts the two electrons from calcium atoms to form CaO which is composed of Ca2+ and O2- ions in the ratio of one Ca2+ ion to one O2− ions.

Non-heme iron is found in some foods that provide all the amino acids humans require for the absorption of iron.

Amino acids are defined as the substances which are considered to be the monomers of proteins.Every amino acid has the same structure  which consists  of a central carbon  bonded to an amino group , carboxyl group and a hydrogen.

Each amino acid also has  an another atom or a group of atoms bonded to the alpha carbon which are also known as the R group or the variable group of the side chain.There are 20 common amino acids which are  present in natural proteins and each amino acid has the same backbone.

The sequence and number of amino acids determines protein's shape,size and also its function. Each amino acid is attached to the other by a covalent bond formed by a dehydration reaction.

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Answer:

ruby

Explanation:

The independent variable with a sign different from the one expected is (c) growth.

The regression equation provided is: P/E = 18.69 + 0.0695 GROWTH - 0.5082 BETA + 0.4262 ROE.

In the equation, the coefficients represent the expected impact of each independent variable on the dependent variable (P/E ratio). A positive coefficient indicates a positive relationship, and a negative coefficient indicates a negative relationship.

Comparing the coefficients to the expected signs:

a. ROE has a coefficient of 0.4262, and it is expected to have a positive impact on P/E ratios, which matches the expected sign.

b. BETA has a coefficient of -0.5082, and it is expected to have a negative impact on P/E ratios, which matches the expected sign.

c. GROWTH has a coefficient of 0.0695, and it is expected to have a positive impact on P/E ratios. However, since the coefficient is positive instead of negative, the sign is different from the expected sign.

Therefore, the independent variable with the sign different from the one expected is (c) growth.

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Answer:

predation.

Explanation:

predation. means the preying of one animal on others

Answer:

Predation

Explanation:

Because one organism eats another. The PREDATOR benefits, the PREY is harmed.

Hope it helps!

Answer:

c. Chemical bonds are broken, and new ones are formed.

Explanation:

Hope this helps. :)

In a chemical reaction, chemical  bonds are broken, and new ones are formed.

Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.

There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are three types of chemical reactions:

1) inorganic reactions

2)organic reactions

3) biochemical reactions

During chemical reactions atoms are rearranged and changes are accompanied by an energy change as new substances are formed.

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Answer:

Potassium is part of the group 1 metals. Remember that an electron’s configuration is based on where it’s place on the periodic table. For Potassium, K, its grouping in the first column indicates that it will have an oxidation state of +1, when it gives up the electron to try and have a full valence. Its +1 because when it loses the electron, it will end up having more protons than electrons, creating a cation. [ For this case, K has 19 electrons and 19 protons, when it loses the electron to form a bond it results in 19 protons and 18 electrons, creating that +1 I mentioned earlier]. Sulfur is a group VIA nonmetal, which indicates that it will have an oxidation state of - 2, since it easier to take in 2 more electrons, than to try and get rid of the 6 it already has in its valance. Again electrons have a negative charge so when an element takes them in, they end up more negative than positive. Now, K= +1 and S= -2, so a compound between the two is only charge neutral when potassium and sulfur are in a 2:1 ratio. Aka K2S, 2 is a subscript of K.

Answer:

Salt molecules block water molecules from packing together when temperature is lowered. It then prevents them from becoming ice. More water molecules leave the solid phase than the ones entering the solid phase. Freezing point depression occurs when the freezing point of the liquid is lowered by addition of solute.

Explanation:

Dichloromethane, also known as methylene chloride, is a colorless, volatile liquid with a sweet aroma. Its boiling point is 39.6 °C (103.3 °F), which makes it a useful solvent in many laboratory experiments.

The boiling point of dichloromethane, also known as DCM or methylene chloride, is an important piece of information for various laboratory applications.

Dichloromethane has a relatively low boiling point of 39.6°C (103.3°F) at standard atmospheric pressure.

This property makes DCM an effective solvent for numerous organic reactions, as it can be easily removed via evaporation.

Additionally, its low boiling point allows for efficient separation of compounds using techniques like distillation.

Being aware of the boiling point helps ensure proper safety precautions are taken, as DCM can release vapors at relatively low temperatures, and these vapors may pose potential health risks if inhaled or come into contact with skin.

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Answer:

The correct answer is - due to the movement of plates it is relocated.

Explanation:

Antarctica is a very cold part of the earth, it is so cold that there is no growth of trees or such vegetation. Even though there are no or less vegetation scientists found fossils of the trees.

It is relocated from the north where the conditions were warmer and easy for tree growth. It is then moved due to plate movements to the south pole. This is the reason behind the fossils scientist found.

In any chemical reaction, the mass of the products must equal the mass of the reactants. The mass of product B is the same as the combined mass of Reactant A and H₂O.

Answer:

sh5barch shougi

Explanation:

Answer:

i'm assuming you meant to say nonmetal atoms... in an ionic bond, electrons from the metal are transferred to the nonmetal. The reason why different numbers of metal and nonmetal atoms can combine is so their charges cancel out. take CaCl2 for example. There are two chlorine atoms for every calcium atom. If it was just CaCl, the charges wouldn't cancel out since calcium has a charge of 2+ and chlorine has a charge of 1-. Therefore to balance the compound, you need two chlorines.

Answer:

J. J. Thomson

Explanation:

This is called the plum pudding model which was proposed by J. J. Thomson.

In solution 4 of part b, both the hydronium concentration and hydroxide concentration are 1 M due to the neutralization reaction between HCl and NaOH. The initial concentrations of H₃O⁺ and OH⁻ were 0.1 M, but they reacted to form water and resulted in equal final concentrations of 1 M for both ions.

To calculate the hydronium and hydroxide concentrations for solution 4 in part b, we need to first understand the equation for the reaction that occurred.

The equation given is: HCl + NaOH -> NaCl + H₂O

This tells us that one mole of HCl reacts with one mole of NaOH to produce one mole of NaCl and one mole of water.

Based on this equation, we know that the initial concentration of hydroxide ions (OH-) in solution 4 is equal to the initial concentration of sodium hydroxide (NaOH), which was given as 0.1 M.

Next, we need to determine the concentration of hydronium ions (H₃O⁺). Since HCl is a strong acid, it completely dissociates in water to produce H₃O⁺ and Cl⁻ ions. Therefore, we can assume that the initial concentration of H₃O⁺ is equal to the initial concentration of HCl, which was also given as 0.1 M.

Now, let's consider what happens when the HCl and NaOH are mixed together. They react to form NaCl and water, which means that the concentrations of H₃O⁺ and OH⁻ will change.

From the equation, we can see that the reaction consumes one mole of HCl and one mole of NaOH. This means that the final concentration of HCl and NaOH will both be zero.

To determine the final concentration of OH-, we need to use the fact that the reaction produces one mole of water for every mole of NaOH that reacts. Therefore, the final concentration of OH⁻ will be equal to the initial concentration of NaOH (0.1 M) divided by the volume of the solution.

If we assume that the volume of the solution is 100 mL (as stated in the question), then the final concentration of OH- will be:

[OH⁻] = 0.1 M / 0.1 L = 1 M

Finally, we can use the fact that the concentration of H₃O⁺ and OH⁻ must be equal in a neutral solution to determine the final concentration of H₃O⁺.

Since the final concentration of OH⁻ is 1 M, we know that the final concentration of H₃O⁺ must also be 1 M.

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Answer:

Ions are atoms that have either gain or lose electrons from the neutral atom.

A loss of electrons results in a positive ion, called a cation, a gain of electron results in a negative ion called an anion.

Ionic compounds are formed by the combination of a cation and anion, or metal + nonmetal.

When naming ionic compounds, name the cation first, and the anion second, changing the ending to ide.

Explanation:

Hope it helped!

Answer:

• [ lost ] or [ gained ]

• [ cation ], [ anion ]

• [ metal ] + [ non-metal ]

• [ cation ] and the [ anion ] to [ compound with suffix "ide" or "ode" ]

Redox reactions involve the transfer of one or more electrons from one molecule to another. When an atom or molecule loses electrons, the process is called oxidation and when an atom or molecule gains electrons, the process is called reduction.

The Law of Thermodynamics states that energy is always produced during energy conversions. The First Law of Thermodynamics, also known as the Law of Conservation of Energy, states that energy cannot be created or destroyed, only transformed from one form to another. Therefore, in any energy conversion, the total amount of energy before and after the conversion remains the same.

The citric acid cycle takes place in the matrix of the mitochondrion. This cycle, also known as the Krebs cycle, is a series of chemical reactions that occur in the mitochondria and produce energy in the form of ATP.

Recent findings indicate that beet juice contains inorganic nitrate, which may improve athletic performance during exercise. Inorganic nitrate can be converted into nitric oxide in the body, which can improve blood flow and oxygen delivery to muscles, potentially enhancing exercise performance.

Chlorophyll absorbs energy and begins the process of photosynthesis. Chlorophyll is a green pigment found in the chloroplasts of plants and algae. It absorbs light energy from the sun and uses it to convert carbon dioxide and water into glucose and oxygen in the process of photosynthesis.

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Oxidation is a chemical reaction that involves the loss of electrons by a substance. Reduction is a chemical reaction that involves the gain of electrons by a substance. The anode is the electrode where oxidation occurs in an electrochemical cell. The cathode is the electrode where reduction occurs in an electrochemical cell.

1. Oxidation: Oxidation is a chemical reaction that involves the loss of electrons by a substance. In this process, the oxidation state of the substance increases.

2. Reduction: Reduction is a chemical reaction that involves the gain of electrons by a substance. During reduction, the oxidation state of the substance decreases.

3. Standard Reduction Potential: The standard reduction potential is a measure of the tendency of a chemical species to undergo reduction (gain electrons) under standard conditions. It is expressed in volts and is used to compare the reducing power of various species.

4. Anode: The anode is the electrode where oxidation occurs in an electrochemical cell. Electrons are released from the anode, causing the oxidation state of the species at the anode to increase.

5. Cathode: The cathode is the electrode where reduction occurs in an electrochemical cell. Electrons are gained at the cathode, causing the oxidation state of the species at the cathode to decrease.

Oxidation is a chemical process where an element or molecule loses electrons. Reduction, on the other hand, is a chemical process where an element or molecule gains electrons. These two processes always occur together and are known as redox reactions. The direction of electron flow in a redox reaction can be predicted by the standard reduction potential, which is the tendency of a substance to gain or lose electrons compared to a standard hydrogen electrode. An anode is an electrode where oxidation occurs, while a cathode is an electrode where reduction occurs. In an electrochemical cell, electrons flow from the anode to the cathode, creating a potential difference between the two electrodes. The direction of this flow can be predicted by the standard reduction potentials of the two half-reactions involved.

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The correct statements about chemical synapses are as follows: To release neurotransmitters into the synaptic cleft, vesicles fuse with the presynaptic membrane.

Synapses allow nerve cells to communicate with one another by turning electrical impulses into chemical messages via axons and dendrites. Chemical synapses, in particular, are specialized junctions through which nervous system cells communicate with one another and with non-neuronal cells such as muscles or glands.

For insntance, when a presynaptic neuron releases acetylcholine at the synapse between a nerve and a muscle (called the neuromuscular junction), it opens postsynaptic Na+ channels. Na+ enters the postsynaptic cell, causing the membrane to depolarize.

There are two kinds of chemical synapses. Type I chemical synapses are the most prevalent in the human brain. These synapses stimulate (trigger) the following neuron. While, Type II synapses are rare in the human brain. The shape of these synapses is asymmetrical.

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Answer:

salad

Explanation:

Answer:

factor

Explanation:

Answer:

something pushes or pulls it to a stop.

The molecule for further use in the citric acid cycle is NAD+.

In the absence of oxygen after glycolysis cells undergo fermentation without the citric acid cycle or oxidative phosphorylation. The citric acid cycle requires oxygen. This is because the electron transport chain requires an electron acceptor to regenerate her NAD, which is the role of oxygen.

Some of this is considered an aerobic pathway because the NADH and FADH2 produced must transfer electrons to the next pathway in the system using oxygen. Without oxygen, this transfer would not occur. Two carbon atoms from each acetyl group enter the citric acid cycle. Oxygen is the terminal electron acceptor of the mitochondrial electron transport chain and is therefore required for energy production via oxidative phosphorylation.

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The freezing point if water is reduced when salt (NaCl) is added to it.

A freezing point is defined as the particular temperature where by a liquid such as water becomes a solid when other conditions are being kept constant.

A freezing point can also be defined as the temperature of a liquid at which it changes its state from liquid to solid at atmospheric pressure.

Some of the factors that affects freezing point of water is the presence of impurities such as salt and change in pressure of the medium.

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Answer:

What????????????????????????????

Explanation:

???

Explanation:

Difference between 63 and 65 = 2.

(63.55 - 63) / 2 * 100% = 27.5%.

(65 - 63.55) / 2 * 100% = 72.5%.

Hence there is 72.5% of the isotope with atomic mass 63 and 27.5% of the isotope with atomic mass 65 in copper.

Answer:

\(V=3850.1769\;L\)

Explanation:

Gas law is the mathematical relationship among pressure,volume, temperature, and the number of moles of a gas. It is the equation of state for an ideal gas. Which is because the state of a gas can be known by it pressure, volume, temperature, and number of moles.
Look below which "R" is a constant

\(PV=nRT\)

\(n=8.47kg\times(\frac{1000g}{1kg})\times(\frac{1mol}{64.066g})\)

\(n=132.2074\;mol\)

\(V=\frac{nRT}{P}\)

\(V=\frac{(132.2074\\;mol\times(8.314\frac{L\cdotkPa}{mol\cdotk)}\times(40+273.15)k}{89.4\;kPa}\)

or (3.85 x 10^3 L)

\(V=3850.1769\;L\)

~Lenvy~

Ethanol, propanol, and methanol are three simple alcohols. They can be grouped together because they all share the same hydroxyl group.

A hydroxyl group is a functional group consisting of an oxygen atom that is covalently bonded to a hydrogen atom. The oxygen atom consists of two lone pair of electrons. Hydroxyl group is chemically represented as -OH.

Alcohols, Sugar and carboxylic acids usually contain hydroxyl groups. All the alcohol have the same functional group which is why they are represented by the formula ROH. Here R is an alkyl group and OH is a hydroxyl group.

Alcohols are formed when this group is added to an organic compound.

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