The rock has a mass of 7.9g and a volume of 3.0 cm3. What is the density of the rock?

In the main group, the nonmetals come before the metalloids and then the metals.

The elements in the periodic table consists of metals, metalloids and non metals. The periodic table is arranged in groups and periods. The groups are vertical while the periods are horizontal.

As you move from top to bottom in the main group, you move from Nonmetals, metalloids, metals.

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Answer:

A. nonmetals, mettalloids, metals

Explanation:

Answer:

12

Explanation:

the 4 by the element symbol O multiplied by the 3 on the outside of the parentheses

Answer:

\(\boxed {\boxed {\sf C. \ 12 \ oxygen \ atoms }}\)

Explanation:

We are given the chemical formula:

\(Fe(ClO_4)_3\)

There are 3 elements here:

The question asks for the number of oxygen atoms, so we can just focus on the O in the formula.

The O has a subscript of 4, indicating there are 4 oxygen atoms in the compound. But the compound is also enclosed in parentheses with a subscript of 3. Therefore, there are 3 of the compounds with 4 oxygen atoms.

We can multiply 3 and 4.

There are 12 oxygen atoms.

pH = 1.92, acidic

pH = 8.24, basic

pH = 11.41, basic

pH = 4.34, acidic

To calculate the pH of a solution, we use the formula:

pH = -log[H+]

where [H+] is the concentration of hydrogen ions in moles per liter.

For [H+] = 1.2 x 10^-2 M:

pH = -log(1.2 x 10^-2) = 1.92

This solution is acidic.

For [H+] = 5.8 x 10^-9 M:

pH = -log(5.8 x 10^-9) = 8.24

This solution is basic.

For [H+] = 3.92 x 10^-12 M:

pH = -log(3.92 x 10^-12) = 11.41

This solution is basic.

For [H+] = 4.52 x 10^-5 M:

pH = -log(4.52 x 10^-5) = 4.34

This solution is acidic.

So, the pH and nature of the solutions are:

pH = 1.92, acidic

pH = 8.24, basic

pH = 11.41, basic

pH = 4.34, acidic

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The rate of disappearance in chemistry describes how quickly a reactant is used up or vanishes during a chemical reaction. \(C_{O} 2\)therefore appears at a rate of 0.26 Ms-1.

O2 and CO combine to generate \(C_{O} 2\) according to a balanced equation: 2CO + O2 2CO2.

The balanced equation's stoichiometry states that 2 moles of \(C_{O} 2\) are created for every 1 mole of oxygen consumed. Thus, the rate of \(C_{O} 2\) emergence is twice as fast as the rate of O2 extinction.

If O2 dissipates at a rate of 0.13 Ms1, then \(C_{O} 2\) appears at a rate of 0.13 Ms1 x 2 = 0.26 Ms1.

\(C_{O} 2\) therefore appears at a rate of 0.26 Ms-1. This is frequently determined by tracking the reactant's concentration over time and using the equation to get the rate of change in concentration.

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Answer: Less

Explanation:

Ethane is a non-polar molecule while water is a polar molecule

Answer:

Calculate the number of moles of NaOH:

molar mass of NaOH = 23.0 g/mol (Na) + 16.0 g/mol (O) + 1.0 g/mol (H) = 40.0 g/mol

moles of NaOH = mass / molar mass = 28.1 g / 40.0 g/mol = 0.7025 mol

Use stoichiometry to determine the number of moles of Na2SO4 produced:

From the balanced chemical equation, we see that 2 moles of NaOH react to form 1 mole of Na2SO4, so:

moles of Na2SO4 = 0.7025 mol NaOH × (1 mol Na2SO4 / 2 mol NaOH) = 0.35125 mol Na2SO4

Therefore, 28.1 g of sodium hydroxide will produce 0.35125 mol of sodium sulfate.

Explanation:

1.15 g of Cu are there in a sample of Cu that contains\(1.09*10^{24}\)atoms

The number of grams of Cu in a sample containing\(1.09*10^{24}\)atoms can be determined using Avogadro's number, which is \(6.02*10^{23}\)atoms/mol.

First, we need to calculate the number of moles of Cu in the sample. To do this, we divide the number of atoms by Avogadro's number to get the number of moles:

\(\frac{1.09*10^{24} atoms }{6.02*10^{23} atoms/mol }= 1.81*10^{-1 }mol\)

The sample's mass needs to be determined next. Since copper has an atomic mass of 63.55 g/mol, we can use this to determine the sample's mass:

\(1.81*10^{-1} mol * 63.55 g/mol = 1.15 g\)

Therefore, the sample contains 1.15 g of Cu.

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Answer:

Below in bold.

Explanation:

6 / 27 = 0.22222..

29.66 / 35.5 = 0.66648

Ratio of M to Cl is  1:6

Empirical formula = MCl3.

Explanation:

In natural radioactive decay, three common emissions occur. When these emissions were originally observed, scientists were unable to identify them as some already known particles and so named them:

alpha particles ( α )

beta particles (β)

gamma rays (γ)

These particles were named using the first three letters of the Greek alphabet. Some later time, alpha particles were identified as helium-4 nuclei, beta particles were identified as electrons, and gamma rays as a form of electromagnetic radiation like x-rays, except much higher in energy and even more dangerous to living systems.

Sedimentation, filtration, and coagulation are the treatments that will help remove contaminants from minerals or from the pipes carrying water from a source.

Sedimentation is a process in which suspended particles settle out of water. It is one of the most basic techniques for removing particles from water. As particles settle, they become trapped in the bottom of a container or settle to the ground in an outdoor setting

Filtration is a method of removing particles from a fluid. It is a physical or chemical separation method that separates solids from fluids (liquids or gases) by adding a medium through which only the fluid can pass.

Coagulation is the process of using chemicals to remove contaminants from water. By creating a chemical reaction, coagulation destabilizes particles and causes them to clump together. This helps to remove the contaminants from the water.

Disinfection is the process of eliminating or destroying pathogens that cause infection. Disinfection eliminates harmful microorganisms by destroying or inactivating them. The disinfectant is a chemical or physical agent that is used to destroy or inactivate harmful microorganisms.

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Answer:

V₁ = 8.75L

Explanation:

P₁ × V₁ = P₂ × V₂

15atm × V₁ = 25atm × 5.25L

V₁ = 8.75L

Answer:

Na(s)

Explanation:

irrespective of it's state, Sodium is an element and elements consists of only one kind of atom and cannot be broken down into a simpler type of matter by either physical or chemical means.

Answer:

true

Explanation:

POPs bio-magnify throughout the food chain and bio-accumulate in organisms.

True. Persistent organic pollutants (POPs) are a group of chemicals that are characterized by their resistance to environmental degradation.

These pollutants can persist in the environment for long periods of time and can accumulate in the tissues of living organisms through a process known as bioaccumulation. Bioaccumulation occurs when organisms absorb these pollutants from their surroundings at a rate that exceeds their ability to eliminate them.

POPs are of particular concern because they can have harmful effects on both the environment and human health. As they accumulate in the tissues of organisms, they can disrupt biological processes and lead to a variety of adverse health effects, including developmental, reproductive, and neurological disorders.

Monitoring of POPs is crucial because it helps to assess their levels in the environment and track any potential changes or trends. By monitoring POPs, scientists and policymakers can gain insights into the extent of contamination, identify potential sources of exposure, and make informed decisions about management and regulatory actions. Monitoring efforts may include measuring POP levels in air, water, soil, and biological samples, as well as assessing their impact on different ecosystems and species.

In conclusion, the statement is true. Persistent organic pollutants (POPs) should be constantly monitored due to their potential to bioaccumulate in the tissues of organisms and their associated adverse effects on both the environment and human health.

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Answer:

0.5 M

General Formulas and Concepts:

Chemistry - Aqueous Solutions

Explanation:

Step 1: Define

2.0 mol glucose

4.0 L glucose solution

Step 2: Find Molarity

The statement is correct. The photoelectric effect refers to the phenomenon where electrons are ejected from the surface of a material when it is exposed to light. The frequency of light striking an electron in a metal must be above the threshold frequency in order for the photoelectric effect to occur.

The statement is correct. The photoelectric effect refers to the phenomenon where electrons are ejected from the surface of a material when it is exposed to light. However, for the photoelectric effect to occur, the frequency of the incident light must be above a certain threshold frequency.

The threshold frequency is the minimum frequency of light required to dislodge electrons from the material. Below this threshold frequency, regardless of the intensity or duration of the light, no electrons will be emitted.

This behavior can be explained by the particle-like nature of light, where light is composed of discrete packets of energy called photons. The energy of a photon is directly proportional to its frequency. Only photons with energy greater than or equal to the binding energy of the electrons in the material can dislodge them.

Therefore, the frequency of light striking an electron in a metal must be above the threshold frequency in order for the photoelectric effect to occur.

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Answer:

39.119 g

Explanation:

1 mole of S has 32.065 g

=> 1.22 x 32.065 = 39.1193 or 39.119 g

Answer:

c cells

Explanation:

learned that in 7th grade

The correct answer is B. Radioactive decay is the spontaneous emission of radiation from the nucleus of an atom, typically due to an unstable arrangement of protons and neutrons.

The correct answer is D. Fusion is a nuclear reaction in which two atomic nuclei come together to form a single, heavier nucleus. In contrast, a simple chemical reaction involves the rearrangement of electrons between atoms or molecules, and does not involve changes to the atomic nuclei. Option A is also not true because energy is released in both fusion and chemical reactions. Option B is describing chemical bonding, which is not present in nuclear fusion reactions. Option C is describing nuclear fission, where a large nucleus is split into smaller ones, but not fusion.

Answer:

Explanation:

The correct answer is B. Radioactive decay is the spontaneous emission of radiation from the nucleus of an atom, typically due to an unstable arrangement of protons and neutrons.

The correct answer is D. Fusion is a nuclear reaction in which two atomic nuclei come together to form a single, heavier nucleus. In contrast, a simple chemical reaction involves the rearrangement of electrons between atoms or molecules, and does not involve changes to the atomic nuclei. Option A is also not true because energy is released in both fusion and chemical reactions. Option B is describing chemical bonding, which is not present in nuclear fusion reactions. Option C is describing nuclear fission, where a large nucleus is split into smaller ones, but not fusion.

shoutout to that guy fr

At equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

1: Write the balanced chemical equation:

\(C_O\)(g) + \(Cl_2\)(g) ⟶ \(C_OCl_2\)(g)

2: Set up an ICE table to track the changes in moles of the substances involved in the reaction.

Initial:

\(C_O\)(g) = 0.3500 mol

\(Cl_2\)(g) = 0.05500 mol

\(C_OCl_2\)(g) = 0 mol

Change:

\(C_O\)(g) = -x

\(Cl_2\)(g) = -x

\(C_OCl_2\)(g) = +x

Equilibrium:

\(C_O\)(g) = 0.3500 - x mol

\(Cl_2\)(g) = 0.05500 - x mol

\(C_OCl_2\)(g) = x mol

3: Write the expression for the equilibrium constant (Kc) using the concentrations of the species involved:

Kc = [\(C_OCl_2\)(g)] / [\(C_O\)(g)] * [\(Cl_2\)(g)]

4: Substitute the given equilibrium constant (Kc) value into the expression:

1.2 x \(10^3\) = x / (0.3500 - x) * (0.05500 - x)

5: Solve the equation for x. Rearrange the equation to obtain a quadratic equation:

1.2 x \(10^3\) * (0.3500 - x) * (0.05500 - x) = x

6: Simplify and solve the quadratic equation. This can be done by multiplying out the terms, rearranging the equation to standard quadratic form, and then using the quadratic formula.

7: After solving the quadratic equation, you will find two possible values for x. However, since the number of moles cannot be negative, we discard the negative solution.

8: The positive value of x represents the number of moles of \(Cl_2\)(g) at equilibrium. Substitute the value of x into the expression for \(Cl_2\)(g):

\(Cl_2\)(g) = 0.05500 - x

9: Calculate the value of \(Cl_2\)(g) at equilibrium:

\(Cl_2\)(g) = 0.05500 - x

\(Cl_2\)(g) = 0.05500 - (positive value of x)

10: Calculate the final value of \(Cl_2\) (g) at equilibrium to get the answer.

Therefore, at equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

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Answer:

B

Explanation:

Answer:

K2S dissociates into three particles in aqueous solution: 2 K+ ions and 1 S2- ion.

An electron domain is A lone pair. Option A.

The electron domain is the space around the atom where electrons are most likely to reside. A domain is a specific subject control or ownership. In the context of electrons, a domain is a space around an atom where electrons are most likely to reside. An atom's electronic domain is the number of unshared electron pairs or chemical bonding sites, that surround the atom.

Represents the number of sites expected to contain electrons. Knowing the electronic domains of each atom in a molecule allows us to predict its shape. In a double or triple bond, all electrons shared between these two atoms are on the same side of the central atom. They, therefore, count as one electronic domain. The central atom of this molecule, A, has four electronic domains.

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Answer: 5,266

Explanation:

5,266

Answer:

True if by rifting you mean continental rift. If not idk.

Answer:

1) SpongeBob’s question is that "what would be the appropriate way to wash his favorite pants as they don't seem as clean as earlier"?

2) SpongeBob’s claim that Clean-O detergent is unable to wash the pants more cleaner as compared to plain water.

3) Independent variable in the given example is the quantity of Clean-O detergent and plain water as it can be changed or manipulated.

4) Dependent variable in the given example is the cleanliness of pants as it will be affected by the quantity of Clean-O detergent and plain water which is an independent variable.