Easy science. I rlly need an answer thanks.

Explanation:

A chemical change in a changes that leads to formation new product or chemical substance having new qualities both physical and chemical.

Therefore, chemical changes can be

1. Gas Production

2. Substances Dissolve to form new substance or solution.

3. Heat is Released is a chemical change.

4. Bubbling occurs.

Rest all are examples of physical changes.

Answer

2,8,18,18,1

Explanation:

The NO₃⁻ ions will not oxidize Mn²⁺ to MnO₄⁻ under standard-state conditions.

To determine whether NO₃⁻ ions will oxidize Mn²⁺ to MnO₄⁻, we compare the reduction potentials (E°) of the half-reactions involved. The higher the reduction potential, the stronger the oxidizing agent.

The reduction potential of the half-reaction involving MnO₄⁻ is +1.51 V (given its reduction potential is positive). The reduction potential of the half-reaction involving NO₃⁻ is +0.96 V (given its reduction potential is positive).

Since the reduction potential of MnO₄⁻ is higher than that of NO₃⁻, MnO₄⁻ is a stronger oxidizing agent.

For a redox reaction to occur, the reducing agent (Mn²⁺) should have a higher reduction potential than the oxidizing agent (NO₃⁻). In this case, since the reduction potential of Mn²⁺ (+1.51 V) is lower than that of NO₃⁻ (+0.96 V), the NO₃⁻ ions cannot oxidize Mn²⁺ to MnO₄⁻ under standard-state conditions.

Therefore, the NO₃⁻ ions will not oxidize Mn²⁺ to MnO₄⁻ under standard-state conditions.

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Answer: False

Explanation: Gaining an electron which has a negative charge results in an overall negative charge, thus making this an anion, and the answer, false.

Answer:false

Explanation:it becomes a anion

Cody's vehicle accelerates by 3 m/s2 (northward) in the 15 seconds it takes to go from 0 m/s to 45 m/s (northward).

Newton's second law, which states that the force acting on a body is equal to the mass of the body, is the fundamental equation of motion in classical mechanics acceleration an of its center of mass, or F = ma.

When the final velocity is 45 m/s (northward), the beginning velocity is 0 m/s, and the time is 15 seconds, we can calculate the acceleration using the formula acceleration = (final velocity - initial velocity) / time.

When these values are added to the formula, we obtain:

acceleration = (45 m/s - 0 m/s) / 15

acceleration = 3 m/s² (northward).

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Answer:

A: 92.02 g

Explanation:

Equation of the reaction;

N2 (g)+ 2O2(g)------> 2NO2(g)

Note that the balanced reaction equation is the first step in solving any problem on stoichiometry. Once the reaction equation is correct, the question can be easily solved...

Answer:

(1) n-Octane

(2) 2-methyl-Heptane

(3) 3-methyl-Heptane

(4) 4-methyl-Heptane

(5) 2-ethyl-Hexane

(6) 3-ethyl- Hexane

Explanation:

We are given Octane which has the chemical formula as C8H18, and we need to find its three possible structures.

Isomerism is defined as the phenomenon in which a chemical compound will consist of the same chemical formula but it will have different orientation or bond arrangements. in simpler meaning isomers of a compound has same chemical formula but has different structures.

Some possible isomers of the compound Octane are given as in terms of their IUPAC names.

Chemical formula : C8H18

(1) n-Octane

(2) 2-methyl-Heptane

(3) 3-methyl-Heptane

(4) 4-methyl-Heptane

(5) 2-ethyl-Hexane

(6) 3-ethyl- Hexane

4. Option B is correct

Given the chemical equation below;

Chemical equation is known to be balanced if the total atom of elements are on both the reactant and product are equal.

From the balanced chemical equation, the coefficient for Ag is 4

The half-life of a compound is 76 years for 42% of a given sample of the compound decomposes in 60 minutes.

The rate law for first order kinetics is

k = \(\frac{2.303}{t}log\frac{a}{a-x}\)

Where

k - rate constant

t - time passed by the sample

a - initial amount of the reactant

a-x - amount left after the decay process

The expression for the half-life of the compound is

\(t_{\frac{1}{2} }=\frac{0.693}{k}\)

Where k is the rate constant

It is given that

t = 60 minutes

a = 100 g

a-x = 100 g - 42 g = 58 g

(Since it is given that 42% of the given compound decomposes)

Then,

k = \(\frac{2.303}{60}log\frac{100}{58}\)

  = 9.08 × \(10^{-3}\) \(years^{-1}\)

Then, the half-life of the compound is

\(t_{\frac{1}{2} }=\frac{0.693}{k}\)

    = \(\frac{0.693}{9.08*10^{-3} }\)

    = 76.3 years ≅ 76 years

Therefore, the half-life of the given compound is 76 years.

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Answer:

It would have a charge of +2.

Explanation:

A proton has a charge of +1, an elctron has a charge of -1, and a neutron has a charge of 0. Ignore the neurons since they have a charge of 0. Since there are 20 protons and 18 electrons (20-18), the overall charge of the atom is +2.

Answer:

Thegas should be cooled to -136.5°C.

Explanation:

Volume of a gas is directly proportional to its temperature on the kelvin scale. This is called Charles' law.

Initially, the gas had a volume of 3.0 L at 0°C(273 K).

We have to have the temperature at which the volume of the gas will be 1.5 L.

Let V1=3 L, T1=273 K, V2=1.5 L, T2=?

By Charles' law,

V1/T1=V2/T2

T2

=(V2×T1)/V1

=(1.5 L×273K)/3L

=136.5 K

=(136.5-273)°C

= -136.5 °C

Explanation:

17. They reach to form Fe2O3

18. I think they dont reach

Answer:

Explanation:

To solve this problem, we can use the ideal gas law, which relates the pressure, volume, temperature, and number of moles of a gas:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

First, we need to convert the initial temperature of 25 °C to Kelvin:

T1 = 25 °C + 273.15 = 298.15 K

Then, we can use the initial conditions to find the number of moles of gas:

n = PV/RT1

where we can assume that the pressure is atmospheric pressure (1 atm) and R is the ideal gas constant (0.0821 L·atm/mol·K).

n = (1 atm)(0.5 L)/(0.0821 L·atm/mol·K)(298.15 K) = 0.0204 mol

Next, we can use the final temperature of 54 °C (327.15 K) to find the final volume:

V2 = nRT2/P

V2 = (0.0204 mol)(0.0821 L·atm/mol·K)(327.15 K)/(1 atm) = 0.551 L

Finally, we can subtract the initial volume from the final volume to find the potential volume increase:

ΔV = V2 - V1 = 0.551 L - 0.5 L = 0.051 L

Therefore, if the aerosol can is heated to 54 °C, the potential volume of the gas contained in the can would increase by approximately 0.051 L. However, this increase in volume would cause a corresponding increase in pressure, which could lead to an explosion if the can is not designed to withstand the increased pressure.

Polarity of water is responsible for the versatility of water as a solvent.

Water is a molecule that is composed of hydrogen and oxygen. The compound is polar because if the high electronegativity difference that exists between hydrogen and oxygen.

As a result of this polarity, a permanent dipole moment exists between the molecules of hydrogen. This is a strong dipole that makes the molecules of water to aggregate together. This strong dipole that exists in water is what we call the hydrogen bond.

Now the hydrogen bond makes water to have a high surface tension and high boiling point. It also accounts for the differences in the solid and the liquid states of water.

As such, the polarity of water is responsible for the versatility of water as a solvent.

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The ΔHvap of ethyl acetate in the given conditions is 35.08 kJ/mol.

Enthalpy of vaporization:

To find the ΔHvap (enthalpy of vaporization) of ethyl acetate in kJ/mol, you can use the Clausius-Clapeyron equation, which is:

ln(P1/P2) = (ΔHvap/R) * (1/T2 - 1/T1)

Given:
Normal boiling point (T2) = 77°C = 350.15 K (converting to Kelvin by adding 273.15)
Vapor pressure at 20°C (P1) = 73 Torr
Temperature at P1 (T1) = 20°C = 293.15 K (converting to Kelvin)
P2 = 760 Torr (normal atmospheric pressure at boiling point)
R = 8.314 J/(mol*K) (universal gas constant)

First, plug the values into the equation:

ln(73/760) = (ΔHvap/8.314) * (1/350.15 - 1/293.15)

Now, solve for ΔHvap:

ΔHvap = 8.314 * (ln(73/760) / (1/350.15 - 1/293.15))

ΔHvap ≈ 35079 J/mol (rounded to the nearest whole number)

Finally, convert ΔHvap to kJ/mol:

ΔHvap ≈ 35.08 kJ/mol (rounded to two decimal places)

So, the ΔHvap of ethyl acetate is approximately 35.08 kJ/mol.

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299.7g of H2O will be produced.

1st) With the balanced chemical equation and the molar mass of CH4 and H2O, we can calculate the amount of H2O that is produced by stoichiometry:

- CH4 molar mass: 16g/mol

- H2O molar mass: 18g/mol

According to the balanced equation, 16g of CH4 will produce 36g of H2O (2 x 18g).

2nd) Now, with a mathematical rule of three we can calculate the grams of water that will be produced from 133.2 grams of CH4:

Finally, 299.7g of H2O will be produced from 133.2 grams of CH4.

Answer:

I would recycle, reuse, and reduce the litter on this already hurt Earth.

Explanation:

Answer:

I can go out and help pick up garbage and i can recycle and not litter and i can reuse all the plastic water bottles i drink.

Explanation:

Im glad you care about mother earth to

Answer:

chemcial energy :)

Explanation:

Answer:

at the light = radiant energy

at the line = electical energy

at the battery = chemical energy

The mass of the sample of calcium carbonate when it absorbs 45. 5 J of heat is option B: 5.0 grams.

This is a heat transfer problem The general formula for heat transfer or heat change (as in absorption) is as follows:

Q = m x c x  ΔT

where:

Q = heat absorbed,

m = mass of the substance,

c = specific heat, and

ΔT = change in temperature.

We are already given:

Q = 45.5 J

ΔT is the difference between 28.5 °C and 21.1 °C:

28.5 °C - 21.1 °C = 7.4 °C

c = 0.82 J/g-K

We need to find the mass of the sample or the substance:

m = Q/ c x ΔT

= 45.5 / 0.82 x 7.4

= 5.0 grams

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Answer:

What are the options

Explanation:

Tell me

Learning to pan or sifting and sorting for gold is simple. In compared to most other prospecting tools, gold pans are affordable. Generally speaking, gold pans are portable, lightweight items that can be transported almost anywhere.

Within a medium-sized pan, panning employs water to separate heavy gold particles from other lighter ones. In this procedure, water and sediment or ore presumed to contain gold are added to a large, curved pan.

Use your fingers to break up any dirt or clay pieces, taking cautious not to allow any material escape. Place the pan in the shower. Pick up the classifier and comb through it with your fingers for gold nuggets once the rocks on top have been thoroughly cleaned.

By utilizing a sifting and sorting to recover gold from a placer deposit, placer mining, also known as gold panning, is a conventional mining method. Due to its low cost and relative simplicity, the method is one of the easiest ways to extract gold and is well-liked among geology enthusiasts.

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Answer:

The correct answer is (b)

Explanation:

Has a slippery feel.Vinegar is an aqueous solution of acetic acid, and it has a number of properties that make it useful in a variety of applications. Some of these properties include:(a) Dissolves in water to give an aqueous solution of acetic acid (H*): Vinegar is composed of water and acetic acid, and it can be dissolved in water to form an aqueous solution.(c) Turns litmus from blue to red: Litmus is a type of dye that is used as an indicator in chemical reactions. It turns blue in the presence of an alkaline solution and red in the presence of an acidic solution. When vinegar is added to litmus, it will turn the litmus red, indicating that it is an acidic solution.(d) Reacts with zinc to give hydrogen gas: When vinegar is mixed with zinc, it can produce hydrogen gas. This reaction is an example of a redox reaction, in which the vinegar is reduced (gains electrons) and the zinc is oxidized (loses electrons).However, vinegar does not have a slippery feel, so (b) Has a slippery feel is not a property of vinegar.

The mass of the potassium iodide will be 4.75.

Potassium iodide (KI) is a chemical compound that consists of potassium cations (K⁺) and iodide anions (I⁻). It is a white crystalline solid that is highly soluble in water and alcohol.

To calculate the mass of potassium iodide in 50.0 mL of 0.575 M KI solution, we can use the formula:

mass = volume x concentration x molar mass

First, we need to convert the volume of the solution from milliliters (mL) to liters (L), which gives:

volume = 50.0 mL = 0.0500 L

Next, we can plug in the given values for concentration and molar mass, which gives:

mass = 0.0500 L x 0.575 mol/L x 166 g/mol

Simplifying the equation gives:

mass = 4.75 g

Rounding the answer to three digits as we get:

mass = 4.75

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heres your answer mate...

True. The element in period 3 that can be used in making computer chips is silicon. because it is a metalloid.

Metalloids have the have properties intermediate of metals and nonmetals. metals give electrons while nonmetals receive. metalloids do neither and rather decides to share. Metals conduct electricity  nonmetals don't while metalloids conduct electricity sparsely. Metals form basic oxides, non metals acidic oxides while metalloids amphoteric or slightly acidic oxides. Metalloids also display typical nonmetal properties like brittleness. Metalloids can also form alloys. The metalloids silicon (Si) is the elements found along the step like line between metals and non-metals of the periodic table and used in making computer chips. It consist of properties from both metals and non-metals.

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Answer:

35.8.540 its korrect now

A potassium atom's ground state electron configuration is 1s2, 2s2, 2p6, 3s2, 3p6, 4s1.

An atom's electron configuration is a picture of how electrons are arranged in relation to orbital shells and subshells. Consequently, this is potassium's electron configuration.

Making Electron Configurations in Writing. Write the energy level (the period) first, then the subshell that needs to be filled, and finally the superscript, which indicates how many electrons are in that subshell. The atomic number, Z, is the sum of all the electrons.

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So, incomplete dominance is a type of genetic inheritance where the phenotype of a heterozygous individual is an intermediate between the two homozygous phenotypes.

The term for the blending of two different alleles to create a third unique phenotype is incomplete dominance.

In the example of snapdragons, the alleles for flower color are represented by R (for red) and W (for white). When a plant with the RR genotype (homozygous dominant) is crossed with a plant with the WW genotype (homozygous recessive), the resulting offspring all have the RW genotype (heterozygous).

In incomplete dominance, the heterozygous phenotype is intermediate between the two homozygous phenotypes. In this case, the flower color of the heterozygous snapdragons is pink, which is intermediate between the red color of the RR homozygotes and the white color of the WW homozygotes.

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