A standardized mass was known to weigh exactly 5.0000 g. It was weighed on a newly acquired, uncalibrated balance as 5.0018g. Calculate the absolute error and the percent error. absolute error: ______ percent error: ______

The calculation of quantities in chemical equations is called stoichiometry. So, the correct option is (d).

By definition, stoichiometry is applying the relationships found in the balanced chemical equation to calculate the amounts of reactants or products in a chemical process. Stoichiometry was first established by Jeremias Benjaim Richter in 1792 as the science of calculating the amounts or mass ratios of chemical elements.

The proportions of variations in the concentrations of species that are interacting chemically are the subject of stoichiometry. Because they contain information about which substances are connected to one another through reactions, their proportions also reveal the topological structure of reaction networks.

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To prepare a 0.125 M solution of copper (II) oxide with a volume of 530.00 mL, you would need to calculate the mass of solid sodium nitrate required. The molar mass of sodium nitrate (NaNO3) is 85.0 g/mol.

To calculate the mass of solid sodium nitrate needed, you can use the formula:

Mass (g) = Molarity (mol/L) x Volume (L) x Molar Mass (g/mol)

Plugging in the values, we get:

Mass (g) = 0.125 mol/L x 0.530 L x 85.0 g/mol

Simplifying the equation gives:

Mass (g) = 5.31375 g

Therefore, approximately 5.31 grams of solid sodium nitrate must be used to prepare a 0.125 M solution of copper (II) oxide with a volume of 530.00 mL.

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Answer:

true, false

Explanation:

Answer:

Explanation:

The volume of the crystal can be found by using the formula

volume = final volume of water - initial volume of water

From the question we have

volume of crystal = 60 - 27

We have the final answer as

Hope this helps you

Answer:

33 ml

Explanation:

60 - 27 = 33 ml

☺️Hope this helps☺️

Answer:

1.46 mol of H₂

Explanation:

This easy question can be solved by a rule of three.

At STP conditions, we know that 1 mol of any gas is contained in 22.4L.

So let's make the operation:

22.4L is the volume for 1 mol of any gas, at STP

32.6 L may be the volume for (32.6 . 1) /22.4 = 1.46 moles.

We can also apply, the Ideal Gases Law.

At STP conditions, Temperature is 273.15 K and pressure is 1 atm

P . V = n . R . T

n = (P . V) / R. T → (1 atm . 32.6L) / (0.082 . 273.15K)

n = 1.455 mol

Answer:

Explanation:

Combustion of coal releases carbon as CO2. Phytoplankton remove carbon dioxide from the atmosphere by photosynthesis. Carbon is passed along the food chain as fish eat the plants. Penguins feed on the fish, taking in the carbon compounds containing the original carbon atom.

The carbon atoms in coal end up in a penguin due to the process of food chain.

Penguins are aquatic flightless birds that are found in the Southern Hemisphere.

The food chain leads to the carbon atom into the penguin.

The carbon atoms are release from the coal combustion.

The released atoms go into plants leaves.

The herbivorous eat plants.

Then the carnivorous eats the herbivorous.

The carnivorous can be a fish and fish are eaten by penguins.

Thus, in this way, the carbon atoms in coal end up in a penguin due to the process of food chain.

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Answer:

m=1,48g

Explanation:

84 mL of 0.060 M NaF is mixed with 28 mL of 0.15 M Sr(NO3)2. the concentration of Sr2+ in the final solution is 0.015 M.

NaF = 84 mL = 0.084 L

Concentration = 0.060 M

Sr(NO₃)₂ = 28 mL = 0.028 L

molarity = 0.15 M.

molarity of NaF = mole / total volume

                          = (0.084 × 0.060) / 0.112

                          = 0.045 M

molarity of  Sr(NO₃)₂  = mole / total volume

                                   = (0.028 × 0.15) / 0.112

                                   = 0.0375 M

the equation is given as :

Sr²⁺   +  2F⁻  ---->  SrF₂

ksp = [Sr²⁺ ] [ F⁻]²

2 × 10⁻¹⁰ = (0.037 + x)(0.045 +2x)²

Sr²⁺ = x + 0.0375 = 0.015 M

The concentration of Sr²⁺ = 0.015 M.

Thus, 84 mL of 0.060 M NaF is mixed with 28 mL of 0.15 M Sr(NO3)2. the concentration of Sr2+ in the final solution is 0.015 M.

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Answer:

The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.

Explanation:

How does the concept of conservation of mass apply to chemical reactions? the reactants and products have exactly the same atoms. the reactants and products have exactly the same molecules. the change in the amount of matter is equal to the change in energy.

can someone help me with my qustions?

Answer:

"Anion" is correct option

Explanation:

An anion is an ion that has gained one or more electrons, acquiring a negative charge.

The ∆G° for the dissolution of AgCl solid is 55.7 kJ/mol.

The gibbs free energy is termed as thermodynamic quantity which is equal to the enthalpy (of a system or process) subtracted by the product of the entropy and the absolute temperature.

The gibbs free energy of the reaction is given by:

∆G°(rxn) =sum of ([∆G°] products)- sum of ( [∆ G°] reactants)

Reaction can be given as:

AgCl(S) » Ag+ (aq) + Cl- (aq)

Gibbs free energy of silver ions = ∆G°f, (Ag+) = 77.1kJ/mol

Gibbs free energy of formation of chloride ions = ∆G°f, (Cl-)= -131. 2kJ/mol

Gibbs free energy of formation of silver chloride solid = ∆ G°f, (AgCl) = - 109.8kJ/mol

The gibbs free energy of the reaction of dissolution of AgCl) :∆ G°rxn:

∆G°rxn = (77.1kJ/mol) – (- 109.8kJ/mol)

55.7kJ/mol

Thus, we found that the ∆G° for the dissolution of AgCL solid is 55.7 kJ/mol.

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The states of matter of the materials;

1) Dispersion forces - Yes

2) Hydrogen bonding - No

3) Ionic - No

4) Dispersion forces - No

5)  Dispersion forces - Yes

6) Ionic  - No

7) Hydrogen bonding - No

Sublimation is a physical process in which a substance transitions directly from its solid phase to its gaseous phase without passing through the intermediate liquid phase. In sublimation, the solid substance is heated, and the resulting gas molecules escape from the solid lattice structure without the need for melting.

One common example of sublimation is the process of dry ice. Dry ice is solid carbon dioxide (CO2) that sublimes at a temperature of -78.5 degrees Celsius (-109.3 degrees Fahrenheit). When dry ice is exposed to room temperature, it transitions directly from a solid to a gas, producing a fog-like effect.

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To find the half-life of sodium-24, we can use the formula for exponential decay:

N(t) = N₀ * (1/2)^(t / t₁/₂)

Where:

N(t) is the amount of the substance remaining at time t

N₀ is the initial amount of the substance

t is the time elapsed

t₁/₂ is the half-life of the substance

Given:

N₀ = 6.00 mg (initial amount)

N(t) = 0.750 mg (amount after 45 hours)

Plugging in these values, we can solve for t₁/₂:

0.750 mg = 6.00 mg * (1/2)^(45 / t₁/₂)

Dividing both sides of the equation by 6.00 mg:

(0.750 mg) / (6.00 mg) = (1/2)^(45 / t₁/₂)

0.125 = (1/2)^(45 / t₁/₂)

To eliminate the base of 1/2, we can take the logarithm of both sides:

log₂(0.125) = 45 / t₁/₂ * log₂(1/2)

Using the property log₂(a^b) = b * log₂(a):

log₂(0.125) = 45 * log₂(1/2) / t₁/₂

We know that log₂(1/2) = -1, so we can simplify the equation further:

log₂(0.125) = -45 / t₁/₂

Now, we can solve for t₁/₂:

t₁/₂ = -45 / log₂(0.125)

Using a calculator:

t₁/₂ ≈ -45 / (-3) ≈ 15

The half-life of sodium-24 is approximately 15 hours.

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Answer:

Nonmetal reactivity decreases down a group because the nucleus' ability to gain more valence electrons weakens due to more nuclear shielding. For Metals: the most reactive metals are those that can lose their valence electrons the most easily. ... Francium is the most reactive metal

Explanation:

Answer:

While moving from top to bottom in a group of the periodic table, the reactivity of non- metals decreases. ... Thus, the tendency of gaining electron/s in the valence shell decreases as well as the chemical reactivity also decreases on moving from top to bottom in a group of non- metals.

As per the given statements : 1. Particle A is an atom because it has protons, electrons and neutrons.2. A, B and C are all particles of the same element. No, A, B and C are not the particles of same element as there no. of electrons differ. 3.Particles A and C are isotopes of the same element. Yes.

The smallest unit of matter in which it can be broken without exhibiting any charged particle is termed as atom. atom is made up of three particles of which Proton (+ivly charged) and electron (-ivly charged) are charged particles while neutron is a neutral particle , doesn't have any charge.

They are the particles of same element and have same no . of protons and electrons i.e. is same atomic number but they differ in no. of neutrons.

So bcz of the above reason in statement three Particles A and C are isotopes of the same element is correct.

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Explanation:

They have a directly proportional relationship.

i.e.

when one of them varies in magnitude, the others will also vary directly.

Quantities expressed as products of each other are always inversely proportional & those expressed as quotients are directly proportional with each other.

KE = 1/2mv^2

Thus, we know that m & v in KE are inversely related.

Inverse proportionality - when m increases, v decreases. & vice versa.

Direct proportionality - when v increases KE also increases

If Temperature increases then the probability of atoms to randomly collide with each other increases rapidly.

the rapidity of these atoms result from the increase in speed(v). since v & KE have a direct r/n ship, KE also increases. as a result the atoms get a relatively high freedom of movement compared to that of those in solids.

Answer: A.

Explanation: When light passes through a small hole, it creates an inverted image on the opposite side. In this case, since the arrow is pointing up, the inverted image will appear pointing down on the opposite wall. Furthermore, since the box has a hole on its left side, the inverted image will be shifted towards the left.

The molecules of isopropyl alcohol do not stick collectively as strongly at room temperature as water molecules do, because of this the alcohol evaporates more quickly than water does.

DNA isn't soluble in ethanol, consequently, it will clump collectively and come to be visible. The colder the ethanol, the less soluble the DNA can be in it, which is why it's far critical for the ethanol to be kept bloodless.

Isopropyl Alcohol may also shape an ignitable vapor/air combination in closed tanks or boxes. Isopropyl Alcohol can react with AIR and OXYGEN over the years to shape unstable peroxides which can explode. Isopropyl Alcohol forms explosive combos, whilst heated, with ALUMINUM.

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The atmospheric pressure on top of Mt. Everest is 35.33 kPa.

The atmospheric pressure on top of Mt. Everest is 265 mmHg. To convert this value to kPa, we need to know the definition of mmHg and kPa.

The definition of mmHg is the amount of pressure exerted by a column of mercury that is 1 millimeter high at standard gravity. The definition of kPa is the amount of pressure exerted by 1000 newtons of force over an area of 1 square meter.

To convert from mmHg to kPa, we can use the following conversion factor:

1 mmHg = 0.133322 kPa

So, to convert 265 mmHg to kPa, we can multiply by the conversion factor:

265 mmHg * 0.133322 kPa/mmHg = 35.33 kPa

Therefore, the atmospheric pressure is 35.33 kPa.

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To determine the specific volume of a sample of dry air, we can use the ideal gas law. The ideal gas law equation is:

PV = nRT

Where:

P = Pressure (in Pascal)

V = Volume (in cubic meters)

n = Number of moles of the gas

R = Ideal gas constant (8.314 J/(mol·K))

T = Temperature (in Kelvin)

To convert the given pressure and temperature to the SI units (Pascal and Kelvin), we have:

Pressure = 50 kPa = 50,000 Pa

Temperature = 263 K

Now, we can rearrange the ideal gas law equation to solve for volume (V):

V = (nRT) / P

Since we're dealing with a specific volume, we need to determine the volume per unit mass. Therefore, we'll consider one kilogram (kg) of dry air.

To calculate the number of moles (n) of air in one kilogram, we need to know the molar mass of dry air. The molar mass of dry air can be approximated as 28.97 g/mol.

1 kg of air = 1000 g

Number of moles (n) = (mass of air) / (molar mass of air)

n = (1000 g) / (28.97 g/mol)

Now we can substitute the values into the equation:

V = [(1000 g) / (28.97 g/mol)] * (8.314 J/(mol·K)) * (263 K) / (50,000 Pa)

V/n ≈ 0.0434 m³/mol is the specific volume of the dry air sample.

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Explanation:

6.02×10^23 atoms are present in 40g of Calcium

x atoms are present in 1.25g of Calcium

Therefore, x =

\((1.25 \times 6.02 \times {10}^{23}) \div 40\)

x =

\(1.88 \times {10}^{22} \)

Answer:

See explanation

Explanation:

Limonene is an oil from oranges and lemons. Its structure has been shown in the image attached to this answer.

There are two different groups of carbon atoms in limonene. One group of carbon atoms are sp2 hybridized while the other group are sp3 hybridized. The group of carbon atoms that are sp2 hybridized have a trigonal planar geometry and have been accurately labeled in the image attached while the carbon atoms that are sp3 hybridized were also labelled and have a tetrahedral geometry.

Hence in limonene, there are trigonal planar and tetrahedral carbon atoms.

Answer:

2 electron shells

hope it helps

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Answer:

a mixture that is made when one substance dissolves and mixes with another substance

A)Acid Dissociation Reactions of Oxalic Acid. The ionization constant (Ka) of oxalic acid is given by the reaction:H_{2}C_{2}O_{4 }+ H_{2}O ⇌ H_{3}O+ + HC_{2}O_{4-}.

B)The equilibrium constant for the basic dissociation of a conjugate base is given by Kb. Kb values are the opposite of Ka values (Kb = Kw/Ka) and are also used to compare the strength of a base's conjugate acid.

A) Acid Dissociation Reactions of Oxalic Acid. The ionization constant (Ka) of oxalic acid is given by the reaction:H_{2}C_{2}O_{4 }+ H_{2}O ⇌ H_{3}O+ + HC_{2}O_{4-}; Ka1 = 5.90 × 10-2 The reaction above describes the primary ionization of oxalic acid, where one of the two acidic hydrogen ions (protons) is lost. The loss of the second hydrogen ion is given by the second equilibrium:H_{2}C_{2}O_{4 }+ H_{2}O ⇌ H_{3}O^{+}+ C_{2}O_{4}^{2-}; Ka2 = 6.40 * 10^{-5} Oxalic acid is a diprotic acid, implying that it has two dissociable protons. It can thus release two protons when dissolved in water. The stronger the acid, the weaker its conjugate base, which means that the conjugate base of the first equilibrium is stronger than that of the second equilibrium.

B) Base Reaction with Water for Each Conjugate BaseThe corresponding base reactions with water for the conjugate bases are:H_{2}C_{2}O_{4 }+ H_{2}O ⇌ H_{3}O+ + HC_{2}O_{4-}; Ka1 = 5.90 * 10-2 H_{2}C_{2}O_{4 }+ H_{2}O ⇌ H_{3}O^{+}+ C_{2}O_{4}^{2-}; Ka2 = 6.40 × 10-5.The equilibrium constant for the basic dissociation of a conjugate base is given by Kb. Kb values are the opposite of Ka values (Kb = Kw/Ka) and are also used to compare the strength of a base's conjugate acid.

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Answer:

I'm gonna say A and B

Explanation:

Not sure though

Hope I helped :)

Answer:

0.33kg

Explanation:

Force=Mass*Acceleration

5N=M*15

divide both side by 15

M=5/15=0.33kg

In this procedure, chemical compounds are heated to a boiling point when one or more fractions of the mixture will evaporate. It is the process that fractions via distillation.

It is a technique for dividing liquids with boiling temperatures that differ by at least fifty degrees. One of the instances of basic distillation is the distillation of water.

The periodic table lists the purest substances and fractions, and most of those substances can be found in nature. In reality, though, the majority of the things we come into contact with and consume on a daily basis are chemical compounds.

Any chemical combination of two or more elements is known as a chemical compound.

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The best description of a chemical bond is A: "A chemical bond holds atoms together."

A chemical bond refers to the force of attraction between two or more atoms that holds them together to form a stable chemical compound. Atoms bond together by sharing, gaining, or losing electrons, resulting in the formation of molecules or compounds.

Chemical bonds are essential for the formation of substances and play a crucial role in determining the properties and behavior of matter. They involve the interaction of valence electrons, the outermost electrons in an atom, which are responsible for chemical bonding.

In summary, option A provides the most accurate and comprehensive description of a chemical bond, emphasizing its role in holding atoms together to form stable compounds. Therefore, Option A is correct.

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