Which occurs when a warm fluid cools down?

A) Energy is released into the environment

B) Energy is absorbed from the environment

C) The density of the fluid decreases

D) The mass of the fluid decreases



THE CORRECT ANSWER IS A!

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Explanation:

In the respiratory chain, the NADH and FADH2 that was accumulated in the preceding degradative pathways is finally disposed of by reacting it with molecular oxygen. The free energy of this “cold combustion” is used to generate ATP. The amount of ATP generated in the respiratory chain far exceeds the modest quantities produced in the upstream pathways; this is the reason why only aerobic metabolism enables us to sustain physical exertion for extended periods of time.

The workings of the respiratory chain are quite different from all other pathways in human metabolism. Each of those other pathways consists of a succession of discrete enzymatic reactions. Inasmuch as these pathways contribute to the production ATP, the energy is always passed from one energy-rich bond to the next, with a newly created phosphoanhydride bond in ATP as the final recipient. In contrast, the respiratory chain combines chemical reactions with physical forces that are not pinned down to individual molecules, and the energy is stored and converted in novel ways.

The electron configuration of magnesium is shown by stating that there are 12 electrons in the first shell, 8 electrons in the second level, and 2 more electrons in the third level.

The atom contains electrons, which are negatively charged particles. The electrons in the atom revolve around the nucleus, which also contains protons and neutrons.

When there are electrons in an atom's orbital, it is said to have an electron arrangement. Electrons can also be found in the atom's various cells.

Since magnesium will occupy the first shell, there will be 12 electrons in Mg. It is still necessary to insert 12-2=10 electrons. The final two electrons and eight remaining electrons will both be in the n=2 level.

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Answer: c

Explanation: just took the test and got it right

The chemical equation that is balanced is:

2 KClO3 ( s )+ MnO2 (s)→ 2 KCl ( s ) + 3 O2 (g) ​

Potassium chlorate (s) when heated in the presence of a manganese dioxide catalyst: When heated in the presence of a manganese dioxide catalyst, potassium chlorate (s) decomposes to create potassium chloride and oxygen gas.

The chemical equation that is balanced is:

2 KClO3 ( s )+ MnO2 (s)→ 2 KCl ( s ) + 3 O2 (g) ​

When potassium chlorate (KClO3) is heated in the presence of manganese dioxide catalyst, it decomposes to form potassium chloride and oxygen gas. The reaction is termed as decomposition reaction.

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HC6H7O5- acts as the base in the following equation, which is written as follows:

H3O+ + HC6H7O5-(aq) ----->Water + H2C6H7O5(aq)(l).

Any substance that accepts a hydrogen ion is a base. This suggests that HC6H7O5- accepts the hydrogen ion from an acid in the reaction to be written.

HC6H7O5- acts as the base in the following equation, which is written as follows:

H3O+ + HC6H7O5-(aq) ----->Water + H2C6H7O5(aq)(l).

any substance that, when dissolved in water, is slippery to the touch, tastes bitter, transforms indicators into different colors (such as turning red litmus paper blue), reacts with acids to produce salts, and triggers specific chemical reactions (base catalysis). Examples of bases include ammonia or its organic derivatives in water solutions and the hydroxides of alkali and alkaline earth metals (sodium, calcium, etc.). (amines). In water solutions, these substances cause hydroxide ions (OH-). (see Arrhenius theory).

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Answer:

The key to understanding why ionic and covalent compounds have different properties from each other is understanding what's going on with the electrons in a compound. Ionic bonds form when atoms have different electronegativity values from each other. When the electronegativity values are comparable, covalent bonds form.

But, what does this mean? Electronegativity is a measure of how easily an atom attracts bonding electrons. If two atoms attract electrons more or less equally, they share the electrons. Sharing electrons results in less polarity or inequality of charge distribution. In contrast, if one atom attracts bonding electrons more strongly than the other, the bond is polar.

Ionic compounds dissolve in polar solvents (like water), stack neatly on each other to form crystals, and require a lot of energy for their chemical bonds to break. Covalent compounds can be either polar or nonpolar, but they contain weaker bonds than ionic compounds because they are sharing electrons. So, their melting and boiling points are lower and they are softer.

I hope this helps have a great day :)

Answer:

1.37x10²⁵atoms of carbon

2.74x10²⁵ atoms of oxygen.

33.7g of KNO₃

Explanation:

To answer this question you must use molar mass of carbon dioxide (44g/mol) and 1 mole are 6.022x10²³atoms.

1.00kg are 1000g of CO₂. Moles are:

1000g CO₂ * (1mol / 44g) = 22.73 moles of CO₂ = 22.73 moles of carbon.

In atoms:

22.73 moles C * (6.022x10²³atoms / 1mole) = 1.37x10²⁵atoms of carbon

There are 22.73 moles of CO₂ * 2 = 45.45 moles of oxygen are present in the carbon dioxide. In atoms:

45.45 moles Oxygen * (6.022x10²³atoms / 1mole) = 2.74x10²⁵ atoms of oxygen.

1 mole of Potassium nitrate, KNO₃, contains 3 moles of oxygen. 1 mol of oxygen are:

1.00 mol O * (1mol KNO₃ / 3 moles O) = 0.33 moles of KNO₃

As molar mass of KNO₃ is 101.1g/mol:

0.33 moles of KNO₃ * (101.1g / mol) = 33.7g of KNO₃

Answer:

1. 1.37 * 10^25 atoms of carbon

2. 2.74 * 10^25 atoms of oxygen

3. 33.67g of Potassium Nitrate

Explanation:

2. Firstly, we want to know the number of atoms of oxygen in 1 kg of carbon dioxide.

Firstly, we will need to know the number of moles of carbon iv oxide in 1kg of carbon iv oxide

Mathematically;

number of moles = mass/molar mass

molar mass of carbon iv oxide is 44 g/mol

mass here is 1000g (1kg is 1000g)

So the number of moles of CO2 in 1kg of CO2 will be; 1000/44 = 22.73 moles

Now 1 mole of CO2 contains 2 atoms of oxygen, thus 1 mole of CO2 contains 2 moles of oxygen

So the number of moles of oxygen in 1kg CO2 will be 2 * 22.73 = 45.46 moles

Mathematically, 1 mole contains 6.02 * 10^23 atoms

So 45.46 moles will contain =

6.02 * 10^23 * 45.46 = 2.74 * 10^25 atoms of oxygen

1. 1 mole of co2 contains 1 atom of carbon , thus, 1 mole of CO2 will

contain 1 mole of carbon

From above, 1kg of carbon iv oxide contains 22.73 moles , thus 1kg of carbon iv oxide will contain 22.73 moles of carbon too

So the number of atoms will be 22.73 * 6.02 * 10^23 = 1.37 * 10^25 atoms

3. Mass of KNO3 that contains 1 mole of oxygen atom

From the formula of the compound, we can see that 1 mole of KNO3 contains 3 atoms of oxygen which translates to 3 moles of oxygen

So 1 mole of oxygen will translate to 1/3 mole of KNO3

Mathematically;

mass = number of moles * molar mass

Molar mass of KNO3 = 39 + 14 + 3(16) = 39 + 14 + 48 = 101 g/mol

So the mass will be = 1/3 * 101 = 33.67g

HCN, Na2SO4: Combination of compounds.

Mg3N2: Chemical compound.

CO2, H2O: Dissolution or hydration reaction.

Cu, Zn(NO3)2: Single-replacement reaction.

Na, N2: Combination of elements.

Let's analyze each chemical combination to determine the type of reaction involved:

HCN, Na2SO4:

The combination of hydrogen cyanide (HCN) and sodium sulfate (Na2SO4) does not represent a specific chemical reaction. It is simply the combination of two compounds.

Mg3N2:

Mg3N2 represents a chemical compound, magnesium nitride. It does not indicate a specific reaction.

CO2, H2O:

The combination of carbon dioxide (CO2) and water (H2O) represents a chemical reaction known as hydration or dissolution. When carbon dioxide dissolves in water, it forms carbonic acid (H2CO3), which can further dissociate into hydrogen ions (H+) and bicarbonate ions (HCO3-).

Cu, Zn(NO3)2:

The combination of copper (Cu) and zinc nitrate (Zn(NO3)2) represents a single-replacement reaction. Copper displaces zinc from the compound, resulting in the formation of copper nitrate (Cu(NO3)2) and zinc metal (Zn).

Na, N2:

The combination of sodium (Na) and nitrogen gas (N2) does not represent a specific reaction. It is simply the combination of two elements.

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Based on their nature of waves, seismic waves changes speed as it moves through different materials.

Seismic waves are the waves that are produced and travel through the earth crust during an earthquake.

Seismic waves are often described as elastic waves which is the energy caused by a sudden breaking of rock within the earth's crust.

Seismic waves can travel at different speeds through different types of rock, bouncing back or changing direction.

Therefore, the correct statement which describes a seismic wave during an earthquake is that the wave changes speed as it moves through different materials.

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Answer:

No

Explanation:

Water has three states of matter namely gas, solid or ice form and liquid. Molecules in solid state are not able to move since they are tightly packed.

Molecules can move in liquid state and they moves easily in gaseous state.

Every substance have three states, that are gas, liquid and solid. In solid state, molecules are tightly packed and are unable to move apart. In liquid state, molecules have some space to move and motion of liquid is easy.

The movement of molecules in a substance depends on the space allotted for them or called the volume. More volume between molecules, easy to move apart.

Gaseous state is composed of molecules located far apart from each other and they diffuse easily. Therefore, motion in three states of water is different and moves faster in gaseous state.

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Based on the particle diagram provided and the given statements, the correct statement about the reaction is; Mg is oxidized because it loses two electrons as it forms Mg²⁺. Option A is correct.

In the particle diagram, Magnesium (represented as Mg) loses two electrons, indicated by the arrows pointing away from the Mg particle. This means that Mg undergoes oxidation, as it loses electrons and its oxidation state increases from 0 to +2 when it forms Mg²⁺. Oxidation is defined as the loss of electrons or an increase in oxidation state.

On the other hand, Br₂ (represented as Br Br) gains two electrons, indicated by the arrows pointing towards the Br Br particles. This means that Br₂ undergoes reduction, as it gains electrons and its oxidation state decreases from 0 to -1 when it forms Br⁻. Reduction is defined as the gain of electrons or a decrease in oxidation state.

Hence, A. is the correct option.

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--The given question is incomplete, the complete question is

"'Mg Br Mg? Br Br Br The formation of magnesium bromide from Mg ad Brz is represented in the particle diagram. Which of the following statements about the reaction is correct? A) Mg is oxidized because it loses two electrons as it forms Mg²⁺? B) Mg is reduced because it gains two electrons as it forms Mg? C) Br is oxidized because it gains an electron as it forms Br Br is reduced because it loses proton as it forms Br J3DE'."--

Answer: Mg is oxidized because it loses two electrons as it forms Mg²⁺

Explanation:

Answer:

0.00420

Explanation:

The equation is Q=mc(T(final)-T(initial), where c is the specific heat, Q is heat supplied, m is mass, T(final) is final temperature and T(initial) is initial temperature (you'll see this written as delta T, which means change in temperature).

2520 = Q

m = 10.0kg; answer choices are in g, not kg, so multiply by 1000 to get m in g; m = 10000 g

Plug in the values you have and solve for c.

2520=(10000)(c)(70-10)

2520=600000c

c=0.0042 j/(gc)

Answer:

4.2 j/kg-C      =  .0042 j / (g-C)

Explanation:

Specific heat units are    j / kg-C

   2520 J  / [ (10 kg)(70-10 C)]   = 4.2   j / kg-C

Answer:

specific heat, the quantity of heat required to raise the temperature of one gram of a substance by one Celsius degree. The units of specific heat are usually calories or joules per gram per Celsius degrees.

Explanation:

the heat required to raise the temperature of the unit mass of a given substance by a given amount (usually one degree).

Answer:

the answer is copper wire

Answer:

To resolve this, we need to place the coefficient “2” in front of the sodium in the reactant, to give the equation shown below. 2 Na (s) + Cl 2 (g) → 2 NaCl (s) In this equation, there are two sodiums in the reactants, two sodiums in the products, two chlorines in the reactants and two chlorines in the products; the equation is now balanced.

Explanation:

The solutions for both are:

V_titanium = (1/4) V_total ≈ 0.188 cm³

And

V_iron = (3/4) V_total ≈ 0.565 cm³

We have a line in the V_titanium-V_iron plane with slope -4.5/7.87 and y-intercept 5/7.87. The two solutions above correspond to the points where this line intersects the line V_titanium = 0 and V_iron = 0, respectively.

The volume of titanium and iron in a bicycle can be related using the following constraint equation:

V_titanium * 4.5 + V_iron * 7.87 = M_total / 1000

where V_titanium and V_iron are the volumes of titanium and iron in cubic centimeters (cm³), M_total is the total mass of the bicycle in grams (g), and we divide by 1000 to convert the mass to kilograms.

We are given that the bicycle weighs 5 kg or 5000 g, so we can substitute M_total = 5000 into the equation:

V_titanium * 4.5 + V_iron * 7.87 = 5000 / 1000

4.5 V_titanium + 7.87 V_iron = 5

This is a linear equation in two variables, V_titanium and V_iron. To find two solutions, we need one additional equation that relates V_titanium and V_iron. One possibility is to assume that the bicycle contains a fixed ratio of titanium to iron, say 1:3. Then we can write:

V_titanium = (1/4) V_total

V_iron = (3/4) V_total

where V_total is the total volume of the bicycle, which is the sum of the volumes of titanium and iron:

V_total = V_titanium + V_iron

Substituting these expressions into the constraint equation and simplifying, we get:

(4.5/4) V_total + (7.87/4) V_total = 5/2

3.31 V_total = 5/2

V_total = (5/2) / 3.31

V_total ≈ 0.753 cm³

Using the ratios above, we can then calculate the volumes of titanium and iron:

V_titanium = (1/4) V_total ≈ 0.188 cm³

V_iron = (3/4) V_total ≈ 0.565 cm³

These are the two solutions for the volumes of titanium and iron in the bicycle, assuming a fixed ratio of 1:3.

To graph the constraint equation, we can solve for V_iron as a function of V_titanium:

V_iron = (5 - 4.5 V_titanium) / 7.87

This gives us a line in the V_titanium-V_iron plane with slope -4.5/7.87 and y-intercept 5/7.87. The two solutions above correspond to the points where this line intersects the line V_titanium = 0 and V_iron = 0, respectively.

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A solution with nitrate(V) ion concentrations over 0.05 mg/cm3 has a molarity of around 1.61 x 10-5 mol/L.

We must first convert the amount of nitrate(V) ions in drinking water to moles per litre since the threshold concentration over which "Blue-Baby" Syndrome might manifest is 0.05 mg/cm3.

It is necessary to know the molar mass of nitrate(V) ions in order to convert from mg/cm3 to moles per litre (NO3-).

The formula below can be used to determine NO3-'s molar mass:

N: 14.01 g/mol for the atomic mass

O: 16.00 g/mol is the atomic mass (3 oxygen atoms in NO3-)

NO3-'s total molar mass is equal to 14.01 + 16.00 x 3 = 62.01 g/mol.

Let's now translate the specified concentration from mg/cm3 to moles/liter (M).

As 1 g = 1000 mg, 1 mg/cm3 is 0.001 g/cm3.

1 cm3 = 0.001 g/mL multiplied by 0.001 g/cm3

1 L/1000 mL x 0.001 g/mL = 0.001 g/L

We must change the grams into moles using the molar mass in order to get the molarity:

1.61 × 10-5 mol/L = 0.001 g/L / 62.01 g/mol

As a result, a solution with nitrate(V) ion concentrations over 0.05 mg/cm3 has a molarity of around 1.61 x 10-5 mol/L.

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The ozone layer is present in the stratosphere layer of the Earth's atmosphere. Therefore, option (C) is correct.

An atmosphere can be defined as layers of gases that envelop a planet and is held in place due to the gravity of the planetary body. A planet contains an atmosphere when the gravity is great and the temperature of the atmosphere of any planet is low.

Earth's atmosphere is made of Nitrogen (78 %), Oxygen (21%), Argon (0.9%), and Carbon dioxide (0.04 %).  The troposphere can be defined as the lowest layer of the atmosphere. The troposphere contains 75 to 80 % of the mass of the atmosphere.

The stratosphere contains the ozone layer, at an altitude between 15km and 35km. This atmospheric layer absorbs most of the UV radiation that Earth receives from the Sun.

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Answer:

the answer is D  

:)

:D

Explanation:

1) We have that one mole of Platinum is 195,084 g/mol

2) The Avogadro number is 6,022x1023.

52.057g/mole is the average atomic mass of chromium. The correct option is option C among all the given options.

Meaning of Average Atomic Mass: To be more specific, the average atomic mass is defined as "the sum of the atomic masses of any and all isotopes of a particular element, each calculated by respective natural abundance on Earth." This is a straightforward explanation of average atomic weight.

The mass of such an atom is measured by its atomic weight (ma or m). Although the kilogram (symbol: kg) is the SI unit of mass, atomic mass is frequently stated inside the non-SI unit Dalton (symbol: Da) - equivalently, united atomic mass unit (u).

average atomic mass = 50×4.3 + 52×83.8 + 53×9.5 + 54×2.4= 52.057g/mole

Therefore, 52.057g/mole is the average atomic mass of chromium. The correct option is option C.

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Answer:

To determine the change in mass of A over the given time period, we need to find the difference between the initial mass of A and the final mass of A.

From the given table, we can see that the initial mass of A at t = 0 (start time) is 12.4 g and the final mass of A at t = 60 minutes (end time) is 6.2 g.

Therefore, the change in mass of A over 60 minutes is:

Final mass of A - Initial mass of A

= 6.2 g - 12.4 g

= -6.2 g

The negative sign indicates that the mass of A decreased over time, which means that A underwent some kind of reaction or process that caused it to lose mass.

The change in mass of A over 60 minutes is -6.2 grams.

To determine the change in mass of A over 60 minutes, we need to compare the initial mass to the final mass.

From the given information, we can see that the mass of A decreases over time.

Let's calculate the change in mass.

Initial Mass of A: 12.4 g

Final Mass of A: 6.2 g

Change in Mass of A = Final Mass of A - Initial Mass of A

= 6.2 g - 12.4 g

= -6.2 g

The change in mass of A over 60 minutes is -6.2 grams.

Note that the negative sign indicates a decrease in mass.

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\(1.5\)  moles of potassium chromate must be dissolved in \(125 g\) of water in order to produce a  \(12.0 m\) solution.

To determine the number of moles of potassium chromate that must be dissolved in   \(125 g\) of water in order to produce a \(12.0 m\) (molar) solution, we can use the formula:

Molarity (M) = moles of solute / liters of solution

First, we need to convert the mass of water from grams to liters. The density of water is approximately \(1 g/mL\), or  \(1 g/cm^3\). Therefore, the volume of water is:

Volume of water = mass of water / density of water \(= 125 g / 1 g/cm^3 = 125 cm^3 = 0.125 L\)

Now, we can use the given molarity and volume of solution to calculate the moles of potassium chromate:

Molarity (M)  \(= 12.0 mol/L\) (given)

Volume of solution  \((L) = 0.125 L\) (calculated)

moles of solute = Molarity (M) x Volume of solution (L)

moles of solute \(= 12.0 mol/L \times 0.125 L\)

moles of solute \(= 1.5 mol\)

Therefore, \(1.5\)  moles of potassium chromate must be dissolved in \(125 g\) of water in order to produce a  \(12.0 m\) solution.

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Answer:

D-The hydrosphere looks blue and covers three-fourths of the Earth’s surface.

Explanation:

The elements which can form anions among the following is O, S and Se.

What are anions?

Anions are the negatively charged ions which are formed by the balanced atoms when they gain one or more electrons to become negatively charged. The examples for anions include, Cl-, F-, O2-, SO4- etc. Usually the anions are formed by the non metals when they gain electrons.

The non metals like O, Se and S have a tendency to form anions because they are just 2 electrons away from completing the octet in the configuration. So, they easily accept 2 electrons to fill the octet and become stable forming anions with other atoms.

Therefore, the elements like O, S and Se form anions faster than the other elements in the following.

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Answer:

4.02 kJ

Explanation:

We must convert the answer to kJ 4023.25 J . 1kJ /1000 =4.02kJ

Answer:

a. The Zn and HCl both retained their identity.