Pb(NO3)2 (aq) + 2 KBr (aq) --> PbBr2 (s) + 2 KNO3 (aq)
this reaction starts with 32.5g lead (II) nitrate and 38.75g potassium bromide, how many grams of the precipitate will be produced?

Answer:

2Mg+O2 = 2MgO is the balanced equation of this reaction. When Mg +O2 reacts MgO is formed. The number of atoms of each element on reactant and product side must be equal

Explanation:

Ur welcome

Answer:

2Mg+O2 ⇒ 2MgO

Answer:

brainless me plss i help you out

Answer:

Excess lemon juice: 162.25 - 92.54 = 69.71

Excess water: 910.08 - 169.55 = 740.53

Explanation:

Excess reactant #2: Water

158.32 x 1/215 x 2/2 x 230.25 = 169.55 g water

Excess lemon juice: 162.25 - 92.54 = 69.71

Excess water: 910.08 - 169.55 = 740.53

Answer:

14 mol O₂

Explanation:

The reaction between CO and O₂ is the following:

CO + O₂ → CO₂

We balance the equation with a coefficient 2 in CO and CO₂ to obtain the same number of O atoms:

2CO + O₂ → 2CO₂

As we can see from the balanced equation, 1 mol of O₂ is required to react with 2 moles of CO. Thus, the conversion factor is 1 mol of O₂/2 mol CO. We multiply the moles of CO by the conversion factor to calculate the moles of O₂ that are required:

28 mol CO x 1 mol of O₂/2 mol CO = 14 mol O₂

If the reaction has reached equilibrium and then the sealed reaction vessel expands, increasing the volume, the reaction would increase.

The equilibrium will change to favor the direction that produces more moles of gas when the volume is increased.

Equilibrium is a state of balance between opposing forces or actions that can be static (such as when forces are applied to a body and the resultant is zero) or dynamic (such as during a reversible chemical reaction when the velocities in both directions are equal). It can also be a state of equilibrium between the mind and the body.

In terms of economics, equilibrium occurs when supply and demand are equal. When you are composed and steady, you are in an equilibrium state.

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Answer:

The links are: the number of circles in the electronic configuration of an element is represented in the periodic table as the period number that element is situated in. the number of electrons in the outermost shell of an element is represented in the periodic table as the group number that element is situated in.

Explanation:

Answer:

Where are the answer choices

?

Answer:

Lab: Acids and Bases Assignment: Lab Report

Section II: Data and Observations

•?

Section III: Analysis and Discussion

Section IV: Conclusions

Answer:

anyone know the section II answers for a lab like this but its the thermal energy transfer lab

Explanation:

^^

Answer:

The main way animal-like protists differ from plant-like protists is in the way they get energy. Animal-like protists are heterotrophs. They have to eat other protists or bacteria in order to get energy, much as animals have to eat plants or other animals to get their energy. Plant-like protists, on the other hand, are autotrophs. They can make their own energy from the sun or other sources just as plants can.

Explanation:

hope that helps ☺️

Explanation:

Animal-like protists are heterotrophs. Plant-like protists, on the other hand, are autotrophs.

First, let's remember the formula to calculate an object's density:

Then, we analyze what we have:

We need to determine the volume, so we transform our formula like this:

We replace our data:

Then, the answer is that the volume equals 12.4 cm^3.

The molar mass of the unknown gas is approximately 4.28 g/mol.

What is molar mass?

The molar mass is the mass of a substance in grams that is equal to one mole of the substance. The mole is a unit of measurement in chemistry that represents the number of entities in a substance, such as atoms, molecules, or ions. One mole of any substance contains Avogadro's number of entities, which is approximately 6.022 x 10^23.

The rate of diffusion of a gas is inversely proportional to its square root of molar mass. This relationship is known as Graham's Law of Diffusion.

Given that CO2 diffuses 3.2 times faster than the unknown gas, we can set up the following equation:

(Diffusion rate of CO2) / (Diffusion rate of unknown gas) = 3.2

(1/√(molar mass of CO2)) / (1/√(molar mass of unknown gas)) = 3.2

Squaring both sides:

(1/molar mass of CO2) / (1/molar mass of unknown gas) = 3.2^2 = 10.24

Therefore,

(1/molar mass of unknown gas) = (1/molar mass of CO2) / 10.24

Given that the molar mass of CO2 is 44.01 g/mol,

(1/molar mass of unknown gas) = (1/44.01) / 10.24

Solving for molar mass of the unknown gas:

molar mass of unknown gas = 44.01 / 10.24 = 4.28 g/mol

So, the molar mass of the unknown gas is approximately 4.28 g/mol.

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Tertiary radicals are stable free radicals with a carbon atom bonded to three other carbon atoms, making them less reactive than other free radicals. They are commonly used in various chemical reactions, such as radical polymerization and substitution reactions.

The following statements are factual regarding tertiary radicals:
1. Tertiary radicals are more stable than primary radicals due to increased hyperconjugation from attached alkyl groups.
2. The CH bond that leads to a tertiary radical via homolysis has a higher bond dissociation energy than the CH bond leading to a primary radical.
3. Tertiary radical hybridization geometry is best described as sp2 hybridization rather than sp3 hybridization.
4. Radical chlorination reactions are more regioselective than radical bromination reactions when a tertiary radical can form.

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Answer: This satisfies the law of definite proportion or constant proportion and it can be proven below.

Explanation:

The law of constant or definite proportion states that all pure samples of the same compound no matter how they are made; are made up of the same elements combined in the same proportion by mass. The can be verified by finding the ratio of copper to oxygen in the both experiment listed above.

In the first experiment:

1.37 g of cupric oxide contains 1.098 g copper therefore oxygen = 1.37 − 1.098

=0.272 g

The ratio of copper to oxygen is=

1.098 ÷ 0.272

= 4:1

In the SECOND or next experiment:

1.476 g of cupric oxide contains 1.17 g copper Therefore oxygen = 1.476−1.17

=0.306g

The ratio of copper to oxygen is =

=1.176 ÷ 0.306

=3.8:1

Which is approximately≃4:1.

In conclusion, despite the different methods of the experiments, composition of copper of copper in the two different samples are the same and the cupric oxide obtained from different sources contain the same elements ( copper and oxygen) combined in the SAME ratio.

You would predict that indoleacetic acid, a plant hormone, would have a(n)  carboxyl group.

The auxin group of naturally occurring plant hormones most frequently found is indole-3-acetic acid. It would be the most well-known auxin as well as the focus of in-depth research by plant physiologists. IAA would be an indole derivative with a carboxymethyl substituent.

The primary auxin in plants contains IAA, which controls a variety of growth and development activities including cell division elongation, tissue differentiation, apical dominance, as well as reactions to pathogens, light, including gravity.

Therefore,  indoleacetic acid, a plant hormone, would have a(n)  carboxyl group.

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Answer:

Since 1982, STP is defined as a temperature of 273.15 K (0 °C, 32 °F) and an absolute pressure of exactly 105 Pa (100 kPa, 1 bar).

Explanation:

I hope I helped

Answer:

(B) Conserved

Explanation:

Answer:

i belive its c

Explanation:

The calorimeter is used to measure heat absorbed or released by a chemical reaction and calculate the enthalpy change while following the law of conservation of energy.

What is the role of a calorimeter in measuring the heat of a chemical reaction?

Heat absorbed by the calorimeter is often used to measure the heat of a chemical reaction. The calorimeter measures the heat absorbed or released by the reaction and can be used to calculate the enthalpy change of the reaction.

During a chemical reaction, heat may be absorbed or released depending on whether the reaction is endothermic or exothermic. In an endothermic reaction, heat is absorbed from the surroundings, while in an exothermic reaction, heat is released to the surroundings.

In any chemical reaction, the heat produced or consumed in the reaction must be equal to the heat absorbed or released by the surroundings. The law of conservation of energy holds that energy cannot be generated or destroyed, but can only be transported or changed from one form to another.

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The product obtained by multiplying the atomic mass of carbon-13 by its abundance is 0.144

Isotopes is a term used in chemistry that can be described as members of a family of an element that have the same number of protons but differ in the number of neutrons

Carbon-13 is a stable carbon isotope whose nucleus consists of six protons and seven neutrons.

Since the mass of Carbon-13 is 13.003 amu and its abundance in nature is 1.109%, we can calculate the product of these as follows;

First, we convert the abundance percentage into a decimal value as follows;

1.109% = 1.109 ÷ 100 = 0.01109

Now;

mass × abundance =  13.003 × 0.01109

mass × abundance = 0.14420327

Now converting it to 3 significant digits;

mass × abundance = 0.144

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Answer:

they are both equal

Explanation:

if you don't know don't guess troll the teacher you will get it wrong anyway

The equation M1V1 = M2V2 is used to solve problems related to dilution in chemistry

Given data in the question

intial concentration = 200 g/l

final concentration = 50 g/l

volume = 2.00 l

Now we know that

M1V1 = M2V2

where

M1 = initial concentration

M2 = concentration after mixing or diluting

V1 = initial volume,

V2 = total final volume

The equation M1V1 = M2V2 is used to solve problems related to dilution in chemistry

What is dilution?

It is process of decreasing the concentration of a solute in a solution, usually simply by mixing with more solvent like adding more water to solution.”

200 g/l × V = 50 g/l × 2

V = ( 50 × 2 ) / 200

= 0.5 L

Volume of stock required is 0.5L

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The term that fits the description provided is photosystem II (PSII). PSII is a protein complex found in the thylakoid membrane of chloroplasts that is responsible for the initial step in the light-dependent reactions of photosynthesis. It contains chlorophyll a, as well as other pigments, that absorb light energy and transfer it to a reaction center chlorophyll molecule.

PSII splits water molecules into oxygen, electrons, and protons through a process called photolysis. This process releases oxygen gas into the atmosphere and produces electrons and protons that are used to generate ATP and NADPH, which are essential for the light-independent reactions of photosynthesis.
PSII is fast and efficient, allowing plants to quickly and effectively harness the energy from sunlight to produce energy-rich molecules. It is also very light dependent, meaning that it is most active in bright light and less active in low light conditions. Overall, PSII is a crucial component of photosynthesis and plays a vital role in supporting life on Earth.

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Answer:

D. It would have a net negative charge

Explanation:

In an atom, there are electrons, protons and neutrons collectively called SUBATOMIC PARTICLES. The charge of an atom is determined by the number of electrons and protons in that atom. A neutral or uncharged atom possess the same number of electrons and protons.

The charge can thus be calculated as follows:

Charge of atom = no. of protons - no. of electrons.

Hence, when the number of electrons in an atom is higher than that of the protons, it means that the atom has gained negatively charged electrons, making that atom have a net negative charge. For example, In an atom that contains 10 protons and 11 electrons, the charge of that atom will be (10 - 11) = -1. The net charge of that atom will be -1, which is NEGATIVE.

Answer:299,800,000

Explain: The speed of light is 3.00x108m/s and in mph is 6.708 x 108.

Answer:

196 grams

because ^^^ was wrong and person in comments said it was 196 and it was right

When NaOH of 4.00 g is being added with water, the mass of water required to create 2.00% of NaOH solution by mass is 196 g.

It means that the particular amount of solute in terms of percentage is present in the solute.

Given the mass of the solute, NaOH is 4.00g

Suppose the mass of water required to add is x in g.

The mass percent of the solute is

\(\dfrac{2}{100} =\dfrac{4.00}{4.00 +x }\)

x =196 g

Therefore, mass of water required to create 2.00% of NaOH solution by mass is 196 g.

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Answer:

3.329 g

Explanation:

First you need to determine the molar mass of H2S which is 34.1 g/mol.

With that we know that to find the moles of H2S we just divide the mass of sample with the molar mass.

3.54 g / 34.1 g/mol = 0.103812317  mol of H2S

This means that there is also 0.103812317  mol of sulfur since there is 1 mole of sulfur per 1 mole of H2S.

The molar mass of sulfur is 32.065 g/mol and to find the mass of sulfur you need to multiply the molar mass with the moles of the compound.  

0.103812317  mol * 32.065 g/mol = 3.329 g of sulfur

Let me know if you get something else or if something is unclear in the comments so that we can figure it out.

Answer:

hi

Explanation:

Given what we know, we can confirm that John Dalton was the first person to show strong empirical evidence for the existence of atoms.

Therefore, given his proposal of the atomic theory and the experiments he carried out to provide evidence to support his claims, we can confirm that John Dalton was the first person to show strong empirical evidence for the existence of atoms.

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The concentration of hydroxyl ion is 10^-9 M.

When an electrolyte is dissolved in water, it dissociates into ions.

In the above case, the ions are hydrogen (H+) and hydroxyl (OH-).

At a temperature of 298 K,

The ionic product(Kw of water is

Kw = [H+] [OH-] = 10^-14

Here [H+] = Concentration of hydrogen ions

[OH-] = Concentration of hydroxyl ions

Assuming that the above solution is at a temperature of 298 K, the ionic product(Kw) of water is

10^-14 = [10^-5] [OH-]

[OH-] = 10^-9.

Thus, the concentration of hydroxyl ions is 10^-9 M.

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