Use the enthalpy of reaction value calculated above to determine how much heat is evolved when 34. 2 ml of 0. 100 m naoh is mixed with 22. 4 ml of 0. 08 m acetic acid?.

The calorimeter constant when 51.203g of water at 55.2c is added to a calorimeter containing 49.783g of water at 23.5c and for the system to equilibrate, the final temperature reached is 37.6c is  9.67J/gc.

Given mass of water (m1) = 51.203g

Temperature of water (T1) = 55.2c

mass of water (m2) = 49.783g

Temperature of water (T2) = 37.6c

the final temperature reached is = 37.6c

We know that specific heat (Q) = mCpΔT where m is mass Cp is latent heat and ΔT is change in temperature.

So Qwater = 51.203 x 4.184 x (23.5 - 55.2) = 6791.9J

Qcalo = 49.783 x Cp x (23.5 - 37.6) = 701.9 x Cp

Given that Qwater = Qcalo

6791.9J = 701.9 x Cp

Cp = 9.67J/gc

Hence the calorimeter constant is  9.67J/gc

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When yeast reacts with sugars, the most prominent evidence that fermentation has occurred is the formation of gas. Fermentation is a process where yeast converts sugars into alcohol and carbon dioxide gas.

As the yeast consumes the sugars, it produces carbon dioxide gas, which can be observed as bubbles in the mixture. This gas formation is a clear indication that fermentation is taking place. Other indicators such as the formation of a solid, a temperature decrease, or a color change may also occur, but they are not as prominent as the gas formation. The formation of a solid, also known as flocculation, can occur when yeast cells clump together and settle at the bottom of the mixture. A temperature decrease can be caused by the endothermic nature of fermentation, but this is not a reliable indicator as temperature changes can be affected by various external factors. A color change may occur due to the formation of by-products during fermentation, but this is not a definitive sign of fermentation.

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The equation derived from the combined gas law is option D: P₁V₁T₁ = P₂V₂T₂. Option D

The combined gas law combines Boyle's law, Charles's law, and Gay-Lussac's law into a single equation that relates the pressure, volume, and temperature of a gas sample. It allows us to analyze changes in these variables while keeping the amount of gas constant.

Boyle's law states that at a constant temperature, the pressure and volume of a gas are inversely proportional. In other words, if the volume of a gas decreases, its pressure increases, and vice versa. This is expressed as P₁V₁ = P₂V₂.

Charles's law states that at a constant pressure, the volume and temperature of a gas are directly proportional. If the temperature of a gas increases, its volume increases, and vice versa. This is expressed as V₁/T₁ = V₂/T₂.

Gay-Lussac's law states that at a constant volume, the pressure and temperature of a gas are directly proportional. If the temperature of a gas increases, its pressure increases, and vice versa. This is expressed as P₁/T₁ = P₂/T₂.

By combining these three laws, we obtain the combined gas law equation: (P₁V₁)/T₁ = (P₂V₂)/T₂. To eliminate the division, we can cross-multiply to get P₁V₁T₂ = P₂V₂T₁, which can be rearranged as P₁V₁T₁ = P₂V₂T₂.

This equation allows us to calculate the final values of pressure, volume, or temperature when any two of these variables change while the amount of gas remains constant. It is particularly useful in analyzing the behavior of gases under different conditions or when studying gas systems.

Option D

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Answer:

it was A for me.. don't know if this will help

Explanation:

The tool commonly used to measure the volume of a liquid is a beaker or a graduated cylinder.

These containers are specifically designed with graduated markings on their sides, allowing you to read the volume directly.

By pouring the liquid into the beaker or graduated cylinder and aligning the meniscus (the curved surface of the liquid) with the appropriate markings, you can accurately determine the volume of the liquid.

Electronic balances are used to measure the mass of an object, not the volume of a liquid.

Meniscus refers to the curved shape that liquids take on when placed in a container, and it is used as a reference point when measuring volume.

Calipers, on the other hand, are primarily used for measuring distances and dimensions, not liquid volume.

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Answer:

Borax bead test

Explanation:

Another test that can be used to identify colored ions in a specific compound such as salt is called "Borax bead test".

This test involves use of a clear glassy bead of borax that is joined together in a wire loop which is going to be involved in chemical reaction with the salts of certain metals.

This reaction will produce colors that we can use to identify the exact metal ions that are present.

Answer:

2. nickel (Ii) acetate

3. sodium chromate tetrahydrate

A radioactive decay is occurring by the emission of charged particles such alpha or beta to form a new stable atom with changes mass number and atomic number.

Heavy unstable radioactive elements undergo nuclear decay by which they form a stable isotope or new atom with changed atomic number. There are two types of nuclear decays mainly. They are alpha decay and beta decay.

During alpha decay isotopes with higher mass number undergo alpha emission and forming a new species with mass number reduced by 4 units and atomic number reduced by 2 units.

In the case of beta- decay, electrons are emitted from the atom and then forming a new atom with atomic number increased by one unit. For an electron capture process, an electron is captured to the atom forming an element with atomic number reduced by one.

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Answer:

Your missing the entire Transitional Metal group as well as all the Lanthanides and Actinides.

Explanation:

The groups are:

Alkali metals.

Alkaline earth metals.

Transitional metals.

Crystallogens.

Pnictogens.

Chalcogens.

Halogens.

Noble gases.

Answer:

CrO₂ --------------------> Cr⁴⁺ and O²⁻

VCO₃ -------------------> V²⁺ and CO₃²⁻

Cr₂(SO₄)₃ -------------> Cr³⁺ and SO₄²⁻

(NH₄)₂S ----------------> NH₄⁺ and S²⁻

Explanation:

Within ionic compounds, the cation is listed first, followed by the anion. Some of the ions are polyatomic, meaning they are covalently bonded to other elements. Polyatomic ions always have a specific charge.

All of these ionic compounds have an overall charge of 0. As such, the charges of the cations and anions must balance out. In order to do so, there are some compounds which have more than one atom of each ion.

2.) CrO₂

------> Oxygen (O) always forms the anion, O²⁻.

------> Therefore, if there are 2 oxygen anions, the chromium (Cr) must have the cationic form of Cr⁴⁺.

------> +4 + (-2) + (-2) = 0

3.) VCO₃

------> Carbonate (CO₃), a polyatomic ion, always has the state CO₃²⁻.

------> If there is only one atom of each ion, the charges must perfectly balance, making vanadium (V) be the cation V²⁺.

------> +2 + (-2) = 0

4.) Cr₂(SO₄)₃

------> Sulfate (SO₄), a polyatomic ion, always has the state SO₄²⁻.

-------> The only way the charges could balance out is if the chromium (Cr) is in the cationic form Cr³⁺.

------> +3 + 3 + (-2) + (-2) + (-2) = 0

5.) (NH₄)₂S

------> Ammonium (NH₄), a polyatomic ion, always has the state NH₄⁺.

------> Sulfur (S) always forms the anion S²⁻.

------> +1 + 1 + (-2) = 0

The atomic weights of elements are generally not integers because they are a weighted average of the isotopic masses of the element's naturally occurring isotopes. Two reasons for the non-integer atomic weights are: natural abundance and isotopic mass.

Isotopes are atoms of the same element that have different numbers of neutrons in their nuclei, leading to different atomic masses. The relative abundance of each isotope contributes to the atomic weight of the element, which can result in non-integer values.

Natural abundance: Naturally occurring elements are typically made up of a mixture of isotopes, and their abundance can vary widely. For example, carbon has two stable isotopes, carbon-12 and carbon-13, with natural abundances of 98.9% and 1.1%, respectively. The average atomic weight of carbon is therefore a weighted average of the isotopic masses of carbon-12 and carbon-13.

Isotopic mass: The isotopic masses of the individual isotopes are not integers themselves, and the relative abundance of each isotope affects the atomic weight, resulting in non-integer values. For example, the isotopic mass of carbon-12 is defined as exactly 12 atomic mass units (amu), but the isotopic mass of carbon-13 is 13.003355 amu, leading to a non-integer average atomic weight for carbon.

Therefore, the atomic weights of elements are generally not integers due to the complex nature of the isotopic mixtures and their isotopic masses.

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Answer:

it's false the correct answer will be There are more red blood cells than white blood cells in the blood

Answer:

you must go to jones im doing the same test

Explanation:

Sheets, tubes, and spheres are only possible when the atoms are connected by covalent bonds. In a network of SiO2, the atoms are connected by strong covalent bonds.

Which results in the formation of a three-dimensional network of tetrahedra. This network structure is responsible for the unique properties of pure silicates. The structures of pure silicates are poor lubricants due to the strong bonds between the atoms, which resist movement. They are also insulating because electrons are tightly bound to the atoms, making it difficult for them to move freely. However, some silicates may exhibit semi-conducting properties if they contain impurities or defects that allow for the movement of charge carriers.

When hydrogen is covalently bound to a highly electronegative element in each molecule of the substance, such as water, hydrogen bonds form between the molecules. Intermolecular bond forces include hydrogen bonds. They maintain a substance's molecular structure in a specific state of matter. They create bridges between molecules, not links between atoms. In the liquid, solid, and gaseous phases of matter, hydrogen bonds are present.

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Answer:

A 1.732 g sample of iron is heated in air. It oxidizes to form a product with a mass of 2.205 g. What is the empirical formula of the product? FeO 4. Caffeine is made of 49.48% carbon, 5.19% hydrogen, 28.85% nitrogen, and 16.48% oxygen by mass.

Explanation:

The empirical formula of the product formed by the reaction of iron and oxygen is FeO.

Let's consider the following generic chemical equation:

Fe + O₂ ⇄ FexOy

According to the law of conservation of mass, the sum of the masses of the reactants is equal to the sum of the masses of the products. The mass of O₂ that reacted, and remains in the oxide is:

\(mFe + mO_2 = mFexOy\\mO_2 = mFexOy - mFe = 2.205 g - 1.732 g = 0.473 g\)

The oxide has 1.732 g of Fe and 0.473 g of oxygen and a total mass of 2.205 g. To determine the empirical formula, we need to calculate the percent composition.

\(\%Fe = \frac{mFe}{mFexOy} \times 100 \% = \frac{1.732 g}{2.205 g} \times 100 \% = 78.55\%\)

\(\%O = \frac{mO}{mFexOy} \times 100 \% = \frac{0.473 g}{2.205 g} \times 100 \% = 21.45\%\)

Now, we will divide each percentage by the atomic mass of the element.

\(Fe: 78.55/55.85 = 1.406\\O: 21.45/16.00 = 1.340\)

Finally, we divide both numbers by the smallest one.

\(Fe: 1.406/1.340 \approx 1 \\O: 1.340/1.340 = 1\)

The empirical formula of the product is FeO.

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A precipitate is a solid formed from a double replacement reaction. When certain cations and anions interact in an aqueous solution, precipitates are insoluble ionic solid products of the process.

When components of two ionic compounds are exchanged, two new compounds are created. These reactions are known as double replacement reactions, double displacement reactions, exchange reactions, or metathesis reactions. The reaction can be thought of as swapping the cations or the anions, but not both, because one would end up with the identical substances one started with. This is the general pattern of a double replacement reaction:

P⁺Q⁻ + R⁺S⁻ → P⁺S⁻ + R⁺Q⁻

The reactants and products of a double replacement reaction are often ionic compounds, however they can also be acids or bases. The solvent for a double replacement reaction is typically water.

Ions are bound together by ionic bonds to form ionic solids. An "ionic bond" is a particular kind of chemical connection between two oppositely charged ions where an electron transfer takes place.

Ionic solids, which are categorised as crystalline solids, have a well-organized, three-dimensional arrangement of their constituent particles that is usually referred as a crystal lattice.

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The mililiters of 0.085 m NaOH are required to titrate the following solution to the equivalence point:

The point at which chemically equal amounts of reactants have been combined is known as the equivalence point, also known as the stoichiometric point, in a chemical process. The equivalence point for an acid-base reaction is the point at which, in accordance with the chemical reaction, equal amounts of acid and base would neutralise one another. Simply that the ratio is the same as in the chemical reaction is all that is implied, not necessarily a 1:1 molar ratio of acid to base. It can be located using an indicator, such as methyl orange or phenolphthalein.

The equivalence point is reached when moles of acid equals moles of base.

(a).  HNO₃ + NaOH = NaNO₃ + H₂O

moles of acid (HNO₃) = 40.0 ml x 1 L / 1000 m x 0.900 mol / L = 0.036 mols

volume of base (NaOH) needed = 0.036 mols HNO₃ x 1 mol NaOH/mol HNO₃ x 1 L / 0.0850 mol = 0.4235 L

volume of base (NaOH) = 424 mL (3 sig. figs.)

(b).  HC₂H₃O₂ + NaOH ==> NaC₂H₃O₂ + H₂O

moles of acid (HC₂H₃O₂) = 35.0 ml x 1 L / 1000 ml x 0.0850 mol / L = 0.002975 mols

moles of base (NaOH) needed = 0.002975 mol acid x 1 mol NaOH / mol acid = 0.002975 mols NaOH

volume of NaOH = 0.002975 mols x 1 L / 0.0850 mol = 0.0350 L = 35.0 mL.

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Answer:

Nb 1= mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm

The volume (in liters) of the NO₂ gas that Xanti added to the containers, given that he added 205 mole of the gas is 4592 liters

First, we shall list out the given parameters from the question. This is shown below:

The volume (in liters) of the 205 moles of NO₂ gas can be obtained as illustrated below:

At standard temperature and pressure, STP,

1 mole of NO₂ gas = 22.4 Liters

Therefore,

205 moles of NO₂ gas = (205 mole × 22.4 Liters) / 1 mole

= 4592 liters

Thus, we can conclude from the above calculation that the volume of NO₂ gas added to the container is 4592 liters

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The answer is  phenolphthalein.

Indicators are substances that indicate the completion of reaction by changing their colours.

What is the pH range of different indicators?

Some common pH indicators are:

• Phenolphthalein indicator is colorless in acidic solutions and turns pink in basic solutions. Its pH range is 8.2 (colorless) -10.0 (pink).

• Bromothymol blue indicates pH near 7. Its changes color from pH 6.0 (yellow) to pH 7.6 (blue).

• Methyl orange shows red color in acidic solutions and yellow color in basic solutions. pH range is 3.1 (red) -4.4 (yellow)

• Methyl violet’s pH range is (0.0-1.6). It changes color from yellow to blue-violet in this range.

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The mass of Ba(IO3)2 that can be dissolved in 500 ml of water at 25 degrees celcius is 2.82 g

The Ksp of Ba(IO3)2 = 1.57 × 10^-9

Molar mass of Ba(IO3)2 = 487 g/mol?

Dissociation of Ba(IO3)2 produces 3 moles of ions as follows:

\(Ba(IO_{3})_{2} \leftrightharpoons Ba^{2+} + 2\:IO_{3}^{-}\)

\(Ksp = [Ba^{2+}]*[IO_{3}^{-}]^{2}\)

\([Ba(IO_{3})_{2}] = \sqrt[3]{ksp} =

\sqrt[3]{1.57 \times {10}^{ - 9} } \\ [Ba(IO_{3})_{2}] = 1.16 \times {10}^{-3} moldm^{-3}\)

moles of Ba(IO3)2 = 1.16 × 10^-3 × 0.5 = 0.58 × 10^-3 moles

mass of Ba(IO3)2 = 0.58 × 10^-3 moles × 487 = 2.82 g

Therefore, mass Ba(IO3)2 that can be dissolved in 500 ml of water at 25 degrees celcius is 2.82 g.

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Answer:

32.7%

Explanation:

To calculate the percentage by mass of an element in a compound, the following procedure is employed:

- Find the atomic mass of the element

- Find the molar mass of the compound

- Divide the atomic mass of the element by the molar mass of the compound and multiply by 100

Mathematically; this is denoted by:

Mass % of Sulphur = (Atomic mass of S/Molar mass of H2SO4) × 100

Atomic mass of S = 32g/lol

Molar mass of H2SO4 = 1(2) + 32 + 16(4) = 2 + 32 + 64

= 98g/mol

Hence,

% mass of S = 32/98 × 100

= 0.3265 × 100

= 32.65

= 32.7 (1 d.p)

Therefore, the percent of sulfur in sulfuric acid (H2SO4) is 32.7%

Answer:

A. True

Explanation:

But, it depends on the brightness of the light hitting on the metal surface.

Answer:

B. Azimuthal

Explanation:

The Azimuthal quantum number tells you the shape of the electron cloud. It is also known as the orbital angular momentum quantum number.

Answer:

I`m pretty sure that B is right

Explanation:

The balanced equation shows that in basic solution, ClO2- is oxidized to ClO4- and Cu2+ is reduced to Cu+.

The balanced redox equation for the reaction in basic solution is:

ClO2- + 4OH- + 3Cu2+ → ClO4- + 3Cu+ + 2H2O

Steps to balance the equation:

Write the unbalanced equation with the oxidation states of each element.

ClO2- → ClO4- (Cl goes from +3 to +7)

Cu2+ → Cu+ (Cu goes from +2 to +1)

Separate the equation into two half-reactions, one for oxidation and one for reduction.

Oxidation half-reaction: ClO2- → ClO4-

Reduction half-reaction: Cu2+ → Cu+

Balance the atoms that are not hydrogen or oxygen in each half-reaction.

Oxidation half-reaction: ClO2- → ClO4- (balance Cl and O)

ClO2- → ClO4- (add 2H2O and 5e- to the right side)

Reduction half-reaction: Cu2+ → Cu+ (balance Cu)

Cu2+ → Cu+ (add 1e- to the left side)

Balance the electrons in each half-reaction.

Oxidation half-reaction: ClO2- → ClO4- + 5e-

Reduction half-reaction: Cu2+ + 1e- → Cu+

Make the number of electrons equal in both half-reactions by multiplying the oxidation half-reaction by 1 and the reduction half-reaction by 5.

Oxidation half-reaction: 5ClO2- + 10OH- → 5ClO4- + 5H2O + 25e-

Reduction half-reaction: 5Cu2+ + 5e- → 5Cu+

Add the half-reactions together and simplify.

5ClO2- + 10OH- + 5Cu2+ + 5e- → 5ClO4- + 5Cu+ + 5H2O

Cancel out the 5e- on both sides.

ClO2- + 4OH- + 3Cu2+ → ClO4- + 3Cu+ + 2H2O

The balanced equation shows that in basic solution, ClO2- is oxidized to ClO4- and Cu2+ is reduced to Cu+.

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Answer:

The Chemistry Explanation

Oil and water don't mix because water molecules are not attracted to oil molecules. When the Alka-Selzer tablet is dropped in the oil and water, it sinks to the bottom because it is more dense than oil and more dense than the water.

Intermolecular forces such as dipole-dipole forces, London dispersion forces exist between molecules and these depend on strength of electronegativity of molecule. Therefore, oil and water mix at the border.

Intermolecular forces of attraction is force of attraction that make two molecule come closer. Intermolecular forces of attraction is directly proportional to the electronegativity of the molecule.

Size of electronegative molecule is small so, if any other molecule or molecule come into contact with this molecule then this molecule attract the electron of other molecule very efficiently and therefore the force between the molecule increases.

Oil has weaker intermolecular forces than water. This makes the intermolecular forces in oil easier to break, and keeps the molecules stuck together in a liquid state.

Therefore, oil and water mix at the border.

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According to the information provided, ammonium chloride salt produces an acidic solution when dissolved in water.

Ammonium nitrate is used by animal farmers for fertilising pasture and hay since urea-based fertilisers have a tendency to volatilize first from soil before the plants can utilise them. Additionally, it is very soluble, making it a good choice for irrigation systems.

Ammonium nitrate is safe to handle under typical circumstances. However, breathing in large amounts or ammonium nitrate powder might irritate the respiratory system. Coughing, sore throats, breathing difficulties, and even suffocation are examples of symptoms.

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Answer:

0 kgm/s

Explanation:

The momentum of Bob while resting at the river is 0 kgm/s.

This is because the momentum of any object at rest is 0.

 Momentum is the quantity of motion a body contains. It is mathematically expressed as;

  Momentum  = m x v

m is the mass

v is the velocity

 So at rest, the velocity of a body is 0m/s and therefore, the momentum is O

Answer:

It can be improved by:

a) Adding METHANOL

b) Adding BUTANOL

c) Adding ETHANOL.

Explanation:

hope it helps.

Answer:

P=1.50 g/mL

this is the answer☺

Hop it helps you!