Which organ system carries materials to human tissues?

Explanation:

Titanium is an element found in the d-block group on the periodic table. It is a transition element.

To write the electronic configuration of an element, we must know the number of electrons in them;

 In a titanium atom, we have 22 electrons;

Shell notation  = 2  8  10 2  

Orbital notation  = 1s² 2s² 2p⁶ 3s² 3p⁶ 3d² 4s²

Answer: [Ar]4s^2 3d^2

Explanation:

In scientific investigations, the effect of fertilizer on plant growth can be studied by examining various variables. Two key variables in this context are the presence or absence of fertilizer (independent variable) and the size or growth of the plant (dependent variable).

When investigating the effect of fertilizer on plant growth, the independent variable is the presence or absence of fertilizer. This variable is controlled by having two groups of plants: one group receiving fertilizer (experimental group) and another group without fertilizer (control group). By comparing the growth of these two groups, we can determine the impact of fertilizer on plant size.

The dependent variable, on the other hand, is the size or growth of the plant. This variable is measured or observed as the outcome of interest. In this case, it would be the height, weight, or overall size of the plants.

By systematically changing the independent variable (presence or absence of fertilizer), we can observe how it affects the dependent variable (plant growth). The experimental group receiving fertilizer is expected to show greater plant growth compared to the control group without fertilizer. This allows us to draw conclusions about the effect of fertilizer on plant growth.

However, it is important to note that the specific outcome may vary depending on other factors such as plant species, soil conditions, and environmental factors. Conducting a controlled experiment while considering these factors helps in obtaining more reliable results.

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Answer: The parts of a dry cell battery are as follows: at the center is a carbon rod called a cathode. The cathode is surrounded by an electrolyte paste. The paste and cathode are surrounded by a separator before finally being sealed within a zinc cylinder.

Explanation: A diagram is show below

Answer:

different

Explanation:

A chemical reaction may be defined as the process or method by which a substance undergo a change in their structure chemically when reacting with some other substance and acquiring the property of both or sometimes forms a new substance. It leads to the chemical transformation of the chemical substance to some another substance.

The properties of the new substance formed is different form the parent substance before the reaction.

Thus, when chemical reaction occurs, the properties of the substances before the reaction and after the reaction takes place is different.

Answer:

(c)

Explanation:

in both black and red

Answer:

I think 3 im am not sure

Explanation:

Answer:

im thinking  its 362x

Explanation:

Answer:

Compounds used as medicines are most often organic compounds, which are often divided into the broad classes of small organic molecules (e.g., atorvastatin, fluticasone, clopidogrel) and "biologics" (infliximab, erythropoietin, insulin glargine), the latter of which are most often medicinal preparations of proteins

This problem is providing a mathematical expression which the result should be expressed with the correct significant figures. At the end, the result is 1209.0 because of the following:

In science, the use of significant figures is crucial as long numbers are not necessarily required when reporting a numerical value, for that reason the importance of reporting measurements with the correct number of significant figures.

In the case of additions, we perform the normal operation as the first step:

1204.2 +4.79613 = 1208.99613

Next, we round the result to the least number of decimal places, in this case one because 1204.2 has just one decimal place, unlike the 4.79613 which has five, so that we round the 8 up to 9 and leave a 0 as the only decimal place:

1209.0

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The 3D clay sphere provides more advantages as a model than  2D cross-section diagram. A diagram is a simple picture or representation.

In many facets of our everyday life, including work, education, personal projects, and much more, diagrams are typically employed. For any business, professional activity, or personal project, creating a clear and well-defined diagram is crucial to displaying a certain concept, idea, relationship, anatomy, statistical data, and any issue in an orderly manner.

A diagram is a simple picture or representation made out of lines and forms that serves to illustrate a certain concept, idea, information, or subject. The 3D clay sphere provides more advantages as a model than  2D cross-section diagram.

Therefore, the 3D clay sphere provides more advantages as a model.

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Answer:

C

microwaves, radio waves, infrared light

Explanation:

Three types of electromagnetic waves that have longer wavelengths than the waves that make up visible light are microwaves, radio waves,  and infrared light.

Electromagnetic waves are type of waves that do not require material medium for their propagation.

The frequency of the wave decrease with increase in the wavelength of the wave.

Also, the wavelength of the wave decreases with increase in the frequency of the wave.

Examples of electromagnetic spectrum arranged in increasing wavelength

Thus, three types of electromagnetic waves that have longer wavelengths than the waves that make up visible light are microwaves, radio waves,  and infrared light.

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Answer: CaCO3 reaction.

Explanation: CaO and  combine together to result in the formation of calcium carbonate compound. we know it is a synthesis reaction.so we can conclude that the most likely products of Cao + co2 → CaCO3 reaction.

The question is incomplete, the complete question is;

Anna is conducting an experiment to determine how weather affects cell phone reception. She is trying to decide the best way to conduct her experiment in order to collect meaningful data. Which of the following experiments would help Anna collect the best data? A. Test different cell phones in different locations on days with clear weather. B. Test different cell phones in different locations on days with rainy weather. C. Test a cell phone's reception in one location with clear weather and in another location with rainy weather. D. Test a cell phone's reception in the exact same location under various atmospheric conditions.

Answer:

D. Test a cell phone's reception in the exact same location under various atmospheric conditions.

Explanation:

In this experiment that Anna intends to carry out, the independent variable is the atmospheric condition. The dependent variable must be the cell phone reception, it is expected to change with  atmospheric conditions.

In order to obtain valid results, other factors such as  such as type of cellphone and location (control variables) must be held constant so as to collect the best data.

Sodium chloride is an ionic compound. The chemical name of Sodium chloride is NaCl.

Ionic compounds are made up of ions. They have charged particles. Ionic compounds when dissolved in solvents they form ions. Sodium chloride losses Na + and cl ions. Magnesium oxide will form mg2+ and O2 ions.

Ionic compounds dissolve in polar solvents. Examples are water, methanol and formamide. For ionic compounds to dissolve there will be ionic compounds will form.

Ionic bonds are not directional. There would be electrostatic or columbic attraction will be form in molecules.  The bonding seen in ionic compounds is called ionic bonding. There are two types of ions seen in molecules such as positive ions and negative ions.

Therefore, Sodium chloride is an ionic compound. The chemical name of Sodium chloride is NaCl.

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Answer: B

Explanation: JUST TOOK THE QUIZ

Answer:

C2H3O2^-(aq) + H^+ —> HC2H3O2

Explanation:

The following equation was given in the question:

Na^+ + C2H3O2^-(aq) + H^+ Cl^- —> Na^+ + Cl^- + HC2H3O2

Now, to obtain the net ionic equation, we simply cancel out the ions common to both side of the equation.

A careful observation of the equation above, shows that sodium ion, Na^+ and chloride ion, Cl^- are common to both side of the equation.

Therefore, to obtain the net ionic equation, we simply cancel out Na^+ and Cl^- from both side of the equation. This is illustrated below:

Na^+ + C2H3O2^-(aq) + H^+ Cl^- —> Na^+ + Cl^- + HC2H3O2

C2H3O2^-(aq) + H^+ —> HC2H3O2

Therefore, the net ionic equation is

C2H3O2^-(aq) + H^+ —> HC2H3O2

Answer:

36

Explanation:

Se has a negative charge of -2

in order for that to be possible there has to be 2 more negative charges than positive chrages

in other words

34 protons 36 electrons

34+ 36-

Answer:

But when there is too much phosphorus and nitrogen into water systems, it can speed up the process of eutrophication ( increase in the concentration of minerals and nutrients, which enhances the growth of algae, which causes algal blooms). Due to this, dissolved oxygen level is declined as not enough light penetrates in the water body.

Explanation:

An isotope of copper, on bombardment with protons, undergoes a nuclear reaction yielding element X as shown below. The group number of element X is: 2963Cu+11H 601n+α+211H+X.

None of the given answer choices (3430 kg, 35.7 kg, 20 kg, or 350 kg) match the calculated value. The correct answer is approximately 20.41 kg.

To determine the child's mass, we need to use Newton's second law of motion, which states that the force acting on an object is equal to the mass of the object multiplied by its acceleration. In this case, we will consider the vertical forces acting on the child.

The weight of an object is the force exerted on it due to gravity, given by the equation:

Weight = Mass × Acceleration due to Gravity

The child's weight is acting downwards, and since the child is in equilibrium (not accelerating vertically), the upward forces on each foot must balance out the weight.

Let's consider the forces acting on each foot:

On the left foot:

Weight on left foot = Mass × Acceleration due to Gravity = 200 N

On the right foot:

Weight on right foot = Mass × Acceleration due to Gravity = 150 N

Since the child's mass is the same on both scales, we can equate the weights on each foot:

Weight on left foot = Weight on right foot

Mass × Acceleration due to Gravity = Mass × Acceleration due to Gravity

200 N = 150 N

Now, we can solve for the child's mass:

Mass = Weight on left foot / Acceleration due to Gravity

Mass = 200 N / 9.8 m/s²

Mass ≈ 20.41 kg

Therefore, the child's mass is approximately 20.41 kg.

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Answer:

its D, convection cells

A physical change will occur when boiling water, tea, sugar, and ice are combined to form sweet iced tea.

A physical change is a change affecting the form of a chemical substance, but not its chemical composition.

The characteristics of some physical changes are as follows:

According to this question, one makes a glass of refreshing sweet iced tea by combining boiling water, tea, sugar, and ice on a hot summer day. The resulting solution is an example of a mixture, which contains constituents that retain their individual identity.

This suggests that the change is a physical change because there is no formation of a new substance.

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Answer:

2, 8, 8

Explanation:

The first electron shell always has 2 electrons when it is complete. The second electron shell and 3rd shell can hold 8 when completed.

Answer:

Answer:Silicon belongs group 14 element belonging to the carbon family. Silicon shares the bonding versatility of carbon with its four valence electrons. It has a weak Si-Si bond. Hence, it is highly reactive

Answer:

B. Taigas

Explanation:

Answer:

Kinetic energy

Explanation:

This is the energy possessed by a moving object.

Gallium (Ga) is a silvery-white, metal element with atomic number 31 and atomic weight 69.723. Gallium is a Group 13 element in the periodic table, with a melting point of 29.76°C and a boiling point of 2,403°C. In nature, gallium is found primarily as gallium(III) oxide and gallium(III) sulfide minerals. In gallium, there are two important isotopes: 69Ga and 71Ga, with isotopic masses of 68.92 amu and 70.92 amu, respectively. Now, the question asks which of the two isotopes, 69Ga or 71Ga, is more abundant. Let us first understand what is an isotope? An isotope is a variation of an element that contains the same number of protons but a different number of neutrons in its nucleus. As a result, isotopes of the same element have distinct atomic masses.

Isotopes are also known as nuclides, and they can be either stable or radioactive. In addition, some isotopes are classified as radioactive because their nuclei are unstable and decay over time, emitting energy in the form of radiation. Therefore, the isotope that is more abundant in gallium is 69Ga. This can be calculated using the formula given below: average atomic mass of gallium = (fractional abundance of 69Ga x mass of 69Ga) + (fractional abundance of 71Ga x mass of 71Ga). Therefore, if the average atomic mass of gallium is 69.72 amu, the relative abundance of 69Ga and 71Ga can be determined as follows: Let the abundance of 69Ga be x and the abundance of 71Ga be y.

The formula for average atomic mass then becomes:69.72 = (x × 68.92) + (y × 70.92)Now, if we subtract the two equations, we get:1 = 2yTherefore, the abundance of 71Ga is 0.5 or 50%.The abundance of 69Ga can then be calculated using the formula: x = (69.72 - 0.50 × 70.92) ÷ 68.92x = 0.601 or 60.1%Therefore, the isotope 69Ga is more abundant in gallium.

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Gasohol is a blend of gasoline and ethanol. To determine the maximum work that can be obtained by burning 1.003 mol of C2H5OH at 25°C and 1 atm, the Gibbs free energy equation can be utilized. What is Gibbs free energy equation? Gibbs free energy equation is a thermodynamic equation that quantifies the maximum quantity of work that may be obtained during a chemical reaction. T

he equation is as follows: ΔG = ΔH - TΔSThe values of ΔH and ΔS are calculated from thermodynamic tables or by calculating the enthalpy and entropy of the products and reactants, and the temperature, T, is usually specified in Kelvin. The change in Gibbs free energy, ΔG, is the maximum amount of energy that can be obtained from the reaction in the form of useful work if the reaction takes place at constant pressure and temperature. The reaction will proceed spontaneously if ΔG is negative. And if ΔG is positive, the reaction will not take place spontaneously. The solution to this problem is shown below:

First, let's figure out how much heat is produced when one mole of C2H5OH is burnt.ΔHrxn = [2(moles of CO2)(-393.5 kJ/mol) + 3(moles of H2O)(-285.8 kJ/mol)] - [(moles of C2H5OH)(-277.7 kJ/mol)]ΔHrxn = [2(2.006 mol)(-393.5 kJ/mol) + 3(3.009 mol)(-285.8 kJ/mol)] - [1.003 mol(-277.7 kJ/mol)]ΔHrxn = -2043.5 kJ/mol. Now, we'll figure out the entropy change for the reaction.ΔSrxn = [2(moles of CO2)(213.8 J/mol-K) + 3(moles of H2O)(69.9 J/mol-K)] - [(moles of C2H5OH)(160.7 J/mol-K)]ΔSrxn = [2(2.006 mol)(213.8 J/mol-K) + 3(3.009 mol)(69.9 J/mol-K)] - [1.003 mol(160.7 J/mol-K)]ΔSrxn = -104.3 J/mol-KThe temperature in Kelvin is 25°C.273 + 25 = 298 KΔG = ΔH - TΔSΔG = -2043.5 kJ/mol - (298 K)(-104.3 J/mol-K)/1000ΔG = -2032.6 kJ/mol. Therefore, the maximum work that can be obtained by burning 1.003 mol of C2H5OH is 2032.6 kJ/mol, which is the value of ΔG.

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