An atom with 16 protons must be:

A. oxygen
B. selenium
C. sulfur
D. can't tell

An atom of chromium has 24 protons, 28 neutrons, and 24 electrons. A chromium atom has three subatomic particles in the nucleus.

There are three subatomic particles: protons, neutrons and electrons.

To calculate the numbers of subatomic particles in an atom, use its atomic number and mass number:

The number of protons = atomic number.

The number of electrons = atomic number.

The number of neutrons = mass number - the atomic number.

Two of the subatomic particles have electrical charges: protons have a positive charge while electrons have a negative charge.

Thus, an atom of chromium has 24 protons, 28 neutrons, and 24 electrons. A chromium atom has three subatomic particles in the nucleus.

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The quantity of heat absorbed is 33.4 kJ.

ΔH_fus = 334 J·g⁻¹

q = mΔH_fus = 100.0 g × 334 J·g⁻¹ = 3.34 × 10⁴ J = 33.4 kJ

To find the heat absorbed when 100.0g of ice is melted, multiply the mass of ice (100.0 g) by the heat of fusion (79.8 cal/g). This results in 7980 calories absorbed during the phase change.

To determine how much heat is absorbed when 100.0g of ice is melted, we need to use the heat of fusion for water. The heat of fusion is the amount of energy required to change a substance from the solid phase to the liquid phase at its melting point without changing its temperature. For water, this value is often given as 79.8 cal/g or 333 J/g.

In this case, we will use the caloric value for the calculation:

Therefore, the total amount of heat absorbed when 100.0 g of ice is melted at 0°C is 7980 calories.

650 KHz means 650 thousand hertz = 650,000 Hertz. If it were an FM station, say at 92.3 MHz, that would be 92.3 Million Hertz or 92,300,000 Hertz. MHz means mega hertz. Mega = Million.

The equivalency of the frequency of the radio wave in Hz is [tex]650 \times 10^3 \ Hz[/tex].

The frequency of a wave is number of cycles of the wave at a given period of time. The frequency of the wave is directly proportional to the speed of the wave and inversely proportional to the wavelength.

[tex]v = f \lambda[/tex]

where;

v is the speed of the wave

f is the frequency of the wave

λ is the wavelength

The given frequency of the wave = 650 kHz

The equivalency of the frequency of the radio wave in Hz  is calculated as follows;

[tex]f = 650 \times 10^3 \ Hz[/tex]

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The answer is the last option.

A chemical change involves the formation of new substances through a chemical reaction that rearranges atoms into new configurations, leading to different properties; the number and type of atoms are conserved.

During a chemical change, new substances are indeed formed. This occurs through a chemical reaction, in which the chemical bonds that hold together the atoms in the substances are broken. The atoms are then rearranged and form new chemical bonds, resulting in the creation of one or more new substances. These new substances typically have different properties from the original substances before the reaction.

It's important to note that no new atoms are introduced, and no atoms are destroyed during this process, as matter is conserved. This principle is known as the law of conservation of matter. Instead, the existing atoms are simply reorganized into different structures or molecules.

da multiple choice imo is B.

and also i believe ur correct on the picture but i'm not 100% sure.

Question One

Let's start with what is not true. E is utter nonsense. Hydrogen for a halogen is a 1 to 1 trade. You give up Michael Jordan, you get Shaq. One for one.

A is not true. The halogen came from a single bond. The hydrogen merely takes it's place.

C is not right either. The bonds between the Carbon atoms don't change. What does is the polar charge that the halogen created. The halogen takes on an electron which makes the molecule minus on the halogen end and positive on the carbon chain.

B is not right. Because the polar charge has been removed, the boiling point will decrease. You have to read this rather carefully. Down and up are bad news in science and you will become better in the sciences when you know what down and up mean.

So we are left with D. D is the correct answer. You now have a very pure saturated compound (but it was before).

Question Two

Start with Sulfur's uncharge state. It has 16 electrons. Those 16 fill up in the following way

1s^2     2s^2   2p^6    3s^2

So far what we have used up 2 + 2 + 6 + 2 = 12

We need to fill up 4 more to put somewhere. That somewhere is in the 3p^6 orbital only we have only 4 more to go. There is a space for 2 more elections in th 3p level.

P level electrons can contain only 6 elections. So whatever follows will complete the 3p level. That's why sulfur's most common charge is - 2

When 2 more electrons are taken on two things are true.

1. The charge is - 2

2. The orbital that fills up is 3p and it becomes 3p^6

it's the kelvin sale

The steps to conduct a scientific experiment include identifying variables, formulating a hypothesis, gathering materials, designing the experiment, executing the experiment, recording and organizing data, analyzing the data, writing a conclusion, and sharing the findings.

The subject question seeks to understand the procedural steps in conducting an experiment. Below is a brief rundown of the steps:

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To conduct an Experiment procedures, you should identify the variables, write a hypothesis, gather materials, design the experiment, conduct the experiment, collect and record data, analyze the data, draw conclusions, and write a conclusion.

Identify the Experiment procedures.

Write out your hypothesis in an if/then format.

Gather your materials.

Design the experiment, including the independent and dependent variables, and any control groups.

Conduct the experiment, following the procedure and manipulating the independent variable.

Record and collect data during the experiment.

Analyze the data using statistical, mathematical, or graphical methods.

Draw conclusions from the data analysis, determining if the results support or reject the hypothesis.

Write a conclusion summarizing the findings of the experiment.

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The activation barrier for the reaction can be determined by comparing the rate constants at two different temperatures using the Arrhenius equation. In this case, the activation barrier is approximately 45.1 kJ/mol.

The activation barrier for a reaction can be determined by comparing the rate constants at two different temperatures. In this case, if the rate constant doubles when the temperature increases from 10.0 °C to 22.0 °C, it means that the reaction rate doubles. The relationship between reaction rate and temperature is given by the Arrhenius equation: k = Ae-Ea/RT, where k is the rate constant, A is the pre-exponential factor, Ea is the activation energy, R is the ideal gas constant, and T is the temperature in Kelvin.

When the temperature increases from T1 to T2, we can use the ratio of the rate constants to find the difference in activation energy:

Ea = -R(ln(k2/k1))/(1/T2 - 1/T1)

In this case, if we assume that the pre-exponential factor remains constant, we can substitute the given information into the equation to find the activation energy:

Ea = -8.314 J/mol K (ln(2))/(1/(22+273) - 1/(10+273))

Ea ≈ 45.1 kJ/mol

Answer: The water on earth.

Explanation:

The hydrosphere is the sphere of the earth which includes water bodies like ocean, river, lakes, ponds, estuaries, and groundwater. The water in the water bodies is replenished by the water cycle.

We usually expess solubility as the maximum number of grams of of a solute that will dissolve in 100 g of solvent.

For example, at 20 °C, the solubility of sodium chloride is 35.89 g/100 g water.

Plasma

Plasma is the stuff of lightning, flame and stars. Plasma is neither solid, liquid nor gas plasma is a fourth state of matter.

Plasma is when the electrons are "freed" from their host atoms for a short time, due to high temperatures. Fire is plasma, it responds to electric fields. Lightning is also plasma.

The use of road salt in winter is impractical in many northern communities because the temperatures can be too low for the salt to do its job.

Salt lowers the melting point of ice, but it loses its effectiveness when the temperatures drop below about -15 °C.

The winter temperatures in Winnipeg, Canada often drop below -30 °C. Road salt has no effect on ice at those temperatures.

Road salt, such as NaCl and CaCl₂, is used to lower the freezing point of water to prevent ice formation on roads and sidewalks. However, its effectiveness is limited in extremely cold temperatures, where it may not sufficiently depress the freezing point, and environmental concerns may make its use impractical.

The use of road salt in winter is a common practice in many regions to combat ice formation on roads and sidewalks. Salt such as sodium chloride (NaCl) or calcium chloride (CaCl₂) is spread because it lowers the freezing point of water, a phenomenon known as freezing point depression. This ensures water does not freeze as easily and reduces the risk of accidents due to slippery surfaces.

However, the practicality of using road salt in some northern communities diminishes as temperatures drop significantly below the effective range of these salts. For example, at temperatures around -35°C, even if salt is applied, the freezing point of water won't be sufficiently depressed to prevent ice from forming. This is because the solubility of the salts decrease with decreasing temperature, limiting their effectiveness. Additionally, environmental concerns such as the potential harm to aquatic life in urban streams may discourage the use of road salt in certain areas.

When salting the roads, it is important to consider the temperature and the environmental impact. While salt can be a solution for melting ice and improving safety in milder winter conditions, in extremely cold environments or ones sensitive to ecological impact, alternative methods or materials might need to be considered.

Calcite can be either dissolved by groundwater or precipitated by groundwater, depending on several factors including the water temperature, pH, and dissolved ion concentrations. Although calcite is fairly insoluble in cold water, acidity can cause dissolution of calcite and release of carbon dioxide gas.

The chemical equation N2 + H2 → NH4 is unbalanced. Neither Nitrogen (N) nor Hydrogen (H) atoms are balanced in accordance with the law of conservation of matter that asserts equality of atoms in reactants and products.

The chemical equation given, N2 + H2 → NH4, is not balanced and thus it's not adhering to the law of conservation of matter. This law states that matter cannot be created or destroyed and therefore, the number of atoms present in the reactants should equal the number of atoms in the products. In this equation, there are 2 Nitrogen atoms and 2 Hydrogen atoms on the left side, but on the right side, there's 1 Nitrogen atom and 4 Hydrogen atoms in the NH4 molecule. Therefore, neither the Nitrogen (N) nor the Hydrogen (H) are balanced in this equation.

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Electronic configure = [He} 1s₂ , 2s₂ , 2p₂

A carbon atom's electron configuration is represented as 1s²2s²2p² indicating two electrons in each the 1s, 2s, and 2p orbitals. This is informed by the Pauli Exclusion Principle and Hund's Rule.

The electron configuration of an atom describes how its electrons are distributed in its atomic orbitals. For the carbon atom which has an atomic number of 6, its six electrons are arranged as follows: 1s²2s²2p². This signifies that two electrons reside in the 1s orbital, two in the 2s orbital and two in the 2p orbital. The Pauli Exclusion Principle and Hund's Rule inform the arrangement of these electrons: the lowest energy configuration has the maximum number of unpaired electrons and no two electrons can have the same set of quantum numbers.

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Reaction of option c produces precipitate.

Rhodium on reacting with potassium phosphate produces rhodium phosphate which remain in solution due to low lattice energy for rhodium phosphate.

Niobium on reacting with lithium carbonate produces niobium carbonate and it will remain in aqueous form.  

Cobalt on reacting with zinc nitrate produces cobalt nitrate. This, Co(NO3 )2 is insoluble precipitate and settles at bottom whereas zinc ion will remain in solution as follows:

[tex]Co^2^+ + Zn(NO¬_3 )¬_2    Co(NO¬_3 )¬_2    + Zn^2^+[/tex]

Potassium ion on reacting with sodium sulfide produces potassium sulfide which remain in solution  

Final answer:

Among the given options, mixing a) Rh³⁺(aq) with K₃PO₄(aq) will produce a precipitate, RhPO₄, since most phosphates are insoluble except those of alkali metals and ammonium.

Explanation:

The question asks which of the following mixtures will produce a precipitate. To determine this, we need to apply knowledge of solubility rules. Precipitates form when products of a chemical reaction are insoluble in water.

a) Rh³⁺(aq) with K₃PO₄(aq): This combination will produce a precipitate of RhPO₄, as phosphates, except those of alkali metals (like sodium and potassium) and ammonium, are generally insoluble.

b) Nb³⁺(aq) + Li₂CO₃ (aq): Niobates are not common, but considering that most carbonates are insoluble except those of alkali metals which Li is, no precipitate is expected here.

c) Co₂⁺(aq) + Zn(NO₃)₂ (aq): Neither of these will produce a precipitate as all nitrates are soluble, and no insoluble compound is formed.

d) K⁺(aq) + Na₂S (aq): This will not produce a precipitate because sulfides of alkali metals are soluble in water.

Therefore, the correct answer is a) Rh³⁺(aq) + K₃PO₄(aq), which will lead to the formation of a precipitate, RhPO₄.

Answer:

yea yea

Explanation:

HEY BUDDY THE ANSWER IS

It processes the environment and sends out signals.

The primary function of the nervous system in keeping the body in homeostasis is to monitor and regulate internal conditions through negative feedback mechanisms.

The primary function of the nervous system in keeping the body in homeostasis is to monitor and regulate internal conditions. This is done through a process called negative feedback. When there is a change in the internal environment, the nervous system detects the change and sends signals to various organs and tissues to make adjustments and return the body to its optimal state.

For example, if the body temperature starts to rise, sensors in the skin and internal organs send signals to the brain. The brain then sends signals to the sweat glands to produce sweat and cool down the body. This helps maintain a stable body temperature, which is necessary for the proper functioning of the body.

In summary, the nervous system plays a crucial role in maintaining homeostasis by constantly monitoring and regulating internal conditions through negative feedback mechanisms.

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Answer:

Emulsion is a mixture of liquid that do not dissolve each other or mix very well.

4. becomes softer as temperature rises

An amorphous solid is any noncrystalline solid in which the atoms and molecules are not organized in a definite lattice pattern. Such solids include glass, plastic, and gel. Solids and liquids are both forms of condensed matter; both are composed of atoms in close proximity to each other.

An amorphous solid becomes softer as temperature rises, which is distinct from crystalline solids; they do not have a sharp melting point but gradually soften with increasing temperature. Option 4 is correct.

An amorphous solid is a type of solid that lacks a well-defined, long-range order or repeating pattern in its internal structure. Unlike crystalline solids, which have sharp melting points due to identical forces holding each atom or molecule in a precise arrangement, amorphous solids do not have a distinct melting point. Instead, they soften over a range of temperatures as heat is applied.

When an amorphous material such as glass or plastic is heated, the weakest intermolecular attractions break first, leading to a gradual softening of the material. As the temperature increases, stronger attractions also begin to break. This results in amorphous solids becoming softer with the rise in temperature, which is a characteristic distinct from crystalline solids.

Therefore, the correct answer to the question is that an amorphous solid becomes softer as temperature rises.

Hardness and density to figure out a mineral'a classification.

The correct answer is option A. Three, dumbbell.

The p sublevel has __three_orbitals that are _dunmbbell_-shaped.

The three orbitals of the p sublevel are oriented in three directions along the x, y and Z axis. The orbitals are called px, py and pz. Each p orbital can have a maximum of 2 electrons. Since there are three p orbitals, the p sublevel can have a maximum of 6 electrons.

Answer : The correct option is, three, dumbbell.

Explanation :

As we know that there are many sub-levels which are s, p, d, f, g and so on. The sub-level are oriented in three directions along the x, y and z axis.

The 's' sub-level has one orbital that are spherically shaped.

The 'p' sub-level has three orbitals [tex](p_x,p_y,p_z)[/tex] that are dumbbell shaped.

The 'd' sub-level has five orbitals [tex](d_{xy},d_{xz},d_{yz}d_{z^2},d_{x^2-y^2})[/tex] that are double-dumbbell shaped.

The 'f' sub-level has seven orbitals [tex](f_{x(x^2-3y^2)},f_{y(x^2-3z^2)},f_{y(3x^2-3y^2)},f_{xz^2},f_{z^3},f_{yz^2},f_{xyz})[/tex] that are complex flower shaped.

Hence, the 'p' sub-level has three orbitals that are dumbbell shaped.

Final answer:

If 10 moles of H2O are produced in the given chemical reaction, CH4 + 2O2 → CO2 + 2H2O, then 5 moles of CO2 are also produced, based on the stoichiometry of the balanced equation.

Explanation:

The given chemical reaction is CH4 + 2O2 → CO2 + 2H2O. This reaction represents the combustion of methane (CH4) to produce carbon dioxide (CO2) and water (H2O).

According to the balanced equation, for every mole of CH4 that reacts, one mole of CO2 is produced and two moles of H2O are produced.

Hence, if 10 moles of water are produced in the reaction, that means that 10 moles of H2O are the result of 5 moles of CH4 completing the reaction since the ratio is 1:2. Therefore, 5 moles of CO2 are also produced, as the ratio of CH4 to CO2 is 1:1.

The ionic equation for the reaction (NH₄)₂SO₄+ K₂CO₃ = (NH₄)₂CO₃ + K₂SO₄ involves writing the formulas of the ions present in the reaction. The net ionic equation is obtained by removing any ions that appear on both sides of the equation. The properties of the compounds involved in the equation are as follows: (NH₄)₂SO₄ - solid (s), K₂CO₃ - solid (s), (NH₄)₂CO₃ - solid (s), K₂SO₄ - solid (s).

The ionic equation for the reaction (NH₄)₂SO₄+ K₂CO₃ = (NH₄)₂CO₃ + K₂SO₄ involves writing the formulas of the ions present in the reaction. The reactants (NH₄)₂SO₄ and K₂CO₃ dissociate into their constituent ions when in aqueous form: 2NH₄+ + SO₄²⁻ + 2K⁺ + CO₃²⁻. The products (NH₄)₂CO₃ and K₂SO₄ also dissociate into their constituent ions: 2NH₄+ + CO₃²⁻ + 2K⁺ + SO₄²⁻.

The net ionic equation is obtained by removing any ions that appear on both sides of the equation. In this case, the net ionic equation becomes: SO₄²⁻. + CO3²⁻ → 2K+ + 2NH₄+.

The properties of the compounds involved in the equation are as follows: (NH₄)₂SO₄ - solid (s), K₂CO₃ - solid (s), (NH₄)₂CO₃ - solid (s), K₂SO₄ - solid (s).

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C - The presence of neutrons, the strong nuclear force, and the residual strong force hold the nucleus together.

is true about the nucleus

The correct statement is C. Neutrons play a crucial role in stabilizing the nucleus by providing additional binding energy without introducing electrical repulsion. The strong nuclear force, which acts between nucleons (protons and neutrons), is responsible for overcoming the electromagnetic repulsion between protons and binding the nucleus together.

Additionally, the residual strong force, also known as the nuclear force, is responsible for holding the nucleons together within the nucleus. These combined forces act to maintain the stability and integrity of the nucleus, ensuring its cohesion despite the repulsive forces between positively charged protons.

Therefore, statement C accurately describes the factors involved in holding the nucleus together.

A cell membrane has a lipid bilayer meaning that it is selectively permeable - allowing only certain ions to enter the cell. Thus maintaining the unique cellular composition which is different from the extracellular environment.

A cell membrane completely made of a polar substance would be completely permeable to all ions present in the extracellular environment, thus disrupting unique ionic composition within the cell.

Answer:done

The cell would be unable to maintain a stable internal environment.

Explanation:

These are the answers B. Reproducible experiments help scientists test if the results are correct. C. Reproducible experiments help build confidence in the theory.

Reproducibility in scientific research is crucial for validating results, building confidence in theories, and maintaining transparency and credibility in the scientific community. It allows other scientists to confirm or question the reliability of findings and ensures that advancements in the field are based on sound evidence.

Reproducibility is a fundamental aspect of scientific inquiry because it helps to ascertain the validity of research findings. One significant reason that reproducibility is vital to scientists is that it permits the verification of results. By repeating experiments and consistently achieving the same outcomes, it builds confidence in the theories and results presented. When experiments are replicable, it means that the findings are robust against variability and not just due to chance or specific conditions of a single study. Moreover, scientific communication and the peer review process rely on clear descriptions of methodologies, so other researchers can replicate studies to confirm reliability or expand upon the findings with additional measures.

Replicability ensures the transparency and openness of scientific work, allowing for meaningful critique and genuine advances in the field. If research is not reproducible, the legitimacy of the original findings is reasonably cast into doubt, leading scientists to question and possibly abandon the theoretical claims. This rigorous process underpins the credibility of scientific knowledge and ensures that the scientific community and the public can have confidence in scientific claims. The entire scientific method relies heavily on the ability to replicate experiments to support evidence-based conclusions -- without replication, the reliability of scientific advancements would be greatly undermined.