A 5. 00 gram sample of lead and a 3. 20 g sample of iron are placed into 367 ml of water. What will be the new volume level of water in units of ml? the density of lead is 11. 34 g/cc and the density of iron is 7. 874 g/cc. Do not enter ""ml"" as part of your answer.

An alkali metal in row 4 has lower ionization energy than another alkali metal in row two because of the greater size of its atom.

Alkali metals belong to the first column of the periodic table. They readily lose their one valence electron in the outermost shell to form ionic compounds with the nonmetals. Lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr) are alkali metals.

Ionization energy means the measure of the capability of a neutral atom to lose or donate its electrons for a chemical reaction. It is an endothermic process that requires energy to lose electrons. Ionization energy in a periodic table increases from left to right while decreases when we move from top to bottom. This is all because of the size of an atom.

The valence electron of an alkali metal in row 4 is far away from the nucleus of the atom and experiences the least forces of attraction. It can readily lose its valence electron in the outermost shell without the requirement of greater energy. Consequently, the alkali metal in row 4 has low ionization energy.

On the other hand, the alkali metal in row 2 has a smaller size. Its valence electron experiences a larger force of attraction from the nucleus. It, therefore, requires greater ionization energy to lose the electron. This means that the alkali metal in row 2 has high ionization energy.

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Answer:

91.44 meters

Explanation:

There are no choices listed but an American pro football field is 100 yards long, which is 91.44 meters.  Rounded to the nearest whole number that would be 91 meters.

The total pressure of the mixture is 65.5 kPa.

According to Dalton's Law of Partial Pressure,

The partial pressure of gas = Mole fraction of gas × Total pressure

Total Pressure = Sum of all the gases partial pressures

The number of moles of methane is,

[tex]Moles \: of \: methane \: (16 g/mol) = 337 \: mg \times \frac{1 g}{1000 mg} \times \frac{ 1 mol}{16 g }[/tex]

= 0.021 mols

The moles of methane are 0.021 mols.

The number of moles of the argon,

[tex]Moles \: of \: argon (40 g/mol) = 148 \: mg \times \frac{ 1 g}{1000 mg } \times \frac{ 1 mol}{40 g} [/tex]

= 0.003 mols

The number of moles of argon is 0.003 mols.

The number of moles of nitrogen is,

[tex]Moles \: of \: nitrogen (28 g/mol) = 296 \: mg \times \frac{ 1 g}{1000 mg} \times \frac{ 1 mol/}{28 g}[/tex]

= 0.010 mols

The number of moles of nitrogen is 0.010 mols.

The total number of moles is,

= 0.021 + 0.003 + 0.010

= 0.034 mols

[tex]Mole \: fraction = \frac{ Moles \: of \: solute }{Total \: number \: of \: moles \: of \: soulte \: and \: solvent}[/tex]

[tex] = \frac{ 0.010 }{ 0.034} [/tex]

= 0.29

[tex]0.29 \: P _{total} = 19 \: kPa [/tex]

[tex] P _{total} = \frac{ 19 \: kPa }{0.29}[/tex]

= 65.5 kPa

Therefore, the total pressure of the mixture is 65.5 kPa.

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A binary star system is made of stars, two of which is brighter than the other.

Astronomers are able to detect the dimmer star because its gravity causes the bright star to wobble

Astronomers can also spot the dimmer star by observing a phenomenon called a(n)  eclipsing binary. This happens when the dim star passes in front of the bright star.

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A material with a high specific heat can absorb a large amount of thermal energy while maintaining a constant temperature.

What is specific heat capacity?

The amount of energy required to raise the temperature of 1 kg of mass of a substance is defined as its specific heat capacity.

It is given mathematically as:

                     C = [tex]\frac{Q}{m}[/tex]ΔT

where

Q denotes the amount of energy supplied.

m denotes the substance's mass.

ΔT denotes the change in temperature of the substance.

The equation can be rewritten as follows:

                       ΔT = [tex]\frac{Q}{mC}[/tex]

As a result, we can see that a substance's temperature rise is inversely proportional to its specific heat capacity.

As a result, a material with a high specific heat can absorb a large amount of thermal energy without significantly changing its temperature.

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The average atomic mass of nitrogen is 14.003 amu.

Nitrogen exists in the form of two isotopes 14N and 15N.

In case an element exists in more than one type of isotope, then its average atomic mass can be calculated using the following formula

Average Atomic Mass = (Percentage abundance of isotope 1) x (Mass of isotope 1) + (Percentage abundance of isotope 2) x (Mass of isotope 2)/100

We are given that

Mass of isotope 1 = 14 amu

%age abundance of isotope 1 = 99.632 %

Mass of isotope 2 = 15 amu

%age abundance of isotope 2 = 0.368 %

Putting the above values in the equation

Average Atomic Mass = (99.632) x 14 + (0.368) x 15/100

Average atomic mass = 14.003 amu

Hence, the average atomic mass of nitrogen is 14.003 amu.

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Answer: It is 14.007 did the test

Explanation:

Value of n is NaCO3: 0.103/0.07= 1.47 and

h2o: 0.07/0.07= 1.

Mole, also spelled mol, in chemistry, standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles.

The mole designates an extremely the large number of units, 6.02214076 × . The mole was previously defined as number of atoms determined experimentally to be found in 12 grams of carbon-12.

The number of units in a mole also bears name Avogadro’s number, or Avogadro’s constant,

The number of atoms or the other particles in a mole is the same for all substances. The mole is related to mass of an element in the following way: one mole of carbon-12 atoms has 6.02214076 × atoms and a mass of 12 grams.

In comparison, one mole of oxygen consists, by definition, of same number of atoms as carbon-12, but it has a mass of 15.999 grams. Oxygen, therefore, has greater mass than carbon. This reasoning also can be applied to the molecular or formula weights.

The mass of anhydrous NaCO3 representing CO2 production is calculated:

m NaCO3 = 0.457*(106 NaCO3/ 44g co2)= 1.10g

Mass of water is calculated:

m h2o =1.85g-0.457= 1.393g

Moles of each component are calculated:

n NaCO3= 1.10/106 = 0.103 mol

n h2o = 1.393/18 = 0.07 mol

They are divided by smallest:

NaCO3: 0.103/0.07= 1.47

h2o: 0.07/0.07= 1

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Answer:

1. 34.25

2.716

3.0.02181

4.1,323.194921978313 round use calculator

5.9.89

6.90 or 91

7.0.0269

Explanation:

Round if you can

According to the Equilibrium Law, addition of products will shift the equilibrium towards left to the reactants and if the products are taken out the equilibrium will proceed in the forward direction to the right, to the products.

Equilibrium Law refers to the state at which the rate of forward reaction is equal to the rate of backward reaction.

Equilibrium Law explains how a reaction in equilibrium will react to disturbances in the amount of products and reactants to counteract the disturbance and also how pH will impact equilibrium.

For example, if we add more product to a chemical reaction then to counteract the disturbance the equilibrium will shift towards left and more amount of reactants are formed. Similarly, if we add more amount of reactant to a chemical reaction then to compensate the change equilibrium will be shifted towards the right side and more amount of product is formed.

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The reaction of Cr₂o₃ with silicon metal at high temperatures will make chromium metal.

The given statement is true.

This reaction shows the formation of Cr when Cr₂O₃ reacts with silicon metal which signifies that chromium metal is formed

2 Cr₂O₃ (s) + 3Si (s) ------> 4Cr (l) + 3SiO₂ (s)

40.47 g of Si and 146.00 g of Cr₂O₃ will be used to produce 1.921 mol of Chromium.

This reaction would give liquid Chromium metal, which isn't the pure form of metal.

Pure Chromium metal can be obtained from the thermal reduction of Cr₂O₃ with aluminum.

Cr₂O₃(s) + 2Al(l) --> 2Cr(l) + Al₂O₃(s)

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Answer:

yes

Explanation:

please take to 8 glasses of water everyday

A typical volume leaving the large intestine might be 180 ml. It would most likely indicate a case of diarrhea, if the volume exiting the large intestine were 396 ml.

Large intestine is an organ which is larger in diameter than the small intestine. It is connected to small intestine at one end and to anus at the other end. The large intestine includes the colon, rectum and anus.

Diarrhea is a health/digestive issue. If it is not treated in time, it can be harmful and lead to serious health problems .An excessive loss of body fluids and weakened immune system may lead to the diarrhea.

Diarrhea and vomiting both can be associated with excessive loss of body fluids resulting in dehydration.

If the volume exiting the large intestine were 396 ml, then it would most likely indicate a case of diarrhea.

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Combustion is the process where fossil fuels, forests, or other carbon-containing substances are burned, adding more carbon dioxide to the air.

Combustion is a reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat.

Combustion is a type of chemical reaction that occurs between fuel and oxygen leading to the production or generation of light and heat as a form of energy.

Examples of combustion reactions include the following:

Therefore, the question is a correct definition of a type of reaction called the combustion reaction.

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Discovering the effect of caffeine on heart rate. The Independent Variable is caffeine, dependent Variable is heart beat, Control is group given no caffeine and constant is same amount of caffeine.

Independent variable is defined as varible which is changed by the experimenter.

Dependent variable is defined as those variable which depends on the independent variable.

It is defined as that group which do not receive experimental treatment.

It is that variable which is kept unchanged for all types of groups in the experiment.

Thus, we concluded that the the Independent Variable is caffeine, dependent Variable is heart beat, Control is group given no caffeine and constant is same amount of caffeine.

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(c)The number of moles of  Na₂CO₃ , in the original 50ml of solution is  0.0093 moles Na₂CO₃ is present.

(d) Disagree, if grams of CaCO₃ is inflated by being wet Na₂CO₃ is inflated and inflating the molarity value.

(e) After the precipitate form and is filtered, the soluble spectator ions removed. I expect that the filtrate conduct electricity.

The balanced equation is given by :

Na₂CO₃  +   Ca(NO₃)₂   ------->    CaCO₃   +    2NaNO₃

(c) no. of moles of Na₂CO₃  =  ?

mole of Ca(NO₃)₂ = 100 ml = 0.1 L × 1mol/L = 0.1 moles of Ca(NO₃)₂

moles of CaCO₃  formed = mass / molar mass

                                        = 0.93 g / 100 g/mol

                                         =  0.0093 mols

from reaction it is clear that , Na₂CO₃ and Ca(NO₃)₂ is in 1:1 ,

one mole  CaCO₃ obtain from 1 mole of  Na₂CO₃

so, no. of moles Na₂CO₃ is originally present originally:

=  0.0093 moles CaCO₃ × 1 moles of Na₂CO₃  /  1mol CaCO₃

=  0.0093 moles Na₂CO₃ is present.  

(d) Disagree, if grams of CaCO₃ is inflated by being wet Na₂CO₃ is inflated and inflating the molarity value.

(e) After the precipitate form and is filtered, the soluble spectator ions removed. I expect that the filtrate conduct electricity.

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Answer: a c 31 45 65 nitrogen

Explanation:

Answer:

3.Ammonia is a compound, and nitrogen and hydrogen are elements.

Explanation:

Look up the differences between elements, compounds and mixtures.

The density of water is 1.94 [tex]slug/ft^3[/tex] if 997 kg/m^3 is rounded to 1000.

The density of a liquid is distinct from that of a solid.

A liquid's density serves as a gauge for its relative weight in relation to the quantity being evaluated. The liquid that weighs heavier is more dense if you weigh or measure the same volume of two different liquids.

It will float on the water if you add a liquid that is less dense than water to the surface of it. The surface of the water will sink if a substance is added that has a density greater than water.

Some examples are:

Liquid                        Temperature         Density

Alcohol, methyl                25                  786.5

Alcohol, propyl                 25                      800

Ammonia (aqua)                 25                   823.5

Aniline                                 25                    1019

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Answer:

5 valence electrons

Explanation:

protons, neutron and electrons are the 3 constituents of atom

Atoms are too small to see by eyes without any equipment  , so we have to use the models to visualize  them.

The current model has a central nucleus which made up of protons and neutrons surrounded by the electrons in the shells

Protons and neutrons are almost of same size, but protons have a positive charge on them, and neutrons do not have any charge.

Electrons are much smaller than protons and neutrons and have a negative charge. 

Protons and neutrons are made up of even smaller particles which is called quarks.

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According to bond energy, the maximum wavelength of light is 475 nanometers.

We need to know about bond energy to solve this problem. Bond energy is the energy needed to bond other atoms in the molecule. To determine the energy in one molecule of chlorine monofluoride, we can use this formula:

E = BE / Na

where E is the energy of photon, BE is bond energy and Na is Avogadro's number (6.02 x 10²³ atoms/mol)

Now, we can calculate the shortest wavelength by using Einstein's equation for photon energy:

E = h . c / λ

where h is Planck constant (6.6 x 10¯³⁴ J.s), c is the speed of light (3 x 10⁸ m/s) and λ is the wavelength.

From the question above, we know that

BE = 251 kJ/mol = 251 x 10³ J/mol

By substituting the given parameters, we can calculate the maximum wavelength

E = BE / Na

h . c / λ = 251 x 10³ / 6.02 x 10²³

6.6 x 10¯³⁴ . 3 x 10⁸ / λ = 251 x 10³ / 6.02 x 10²³

λ = 4.75 x 10¯⁷ m

λ = 475 nm

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The liquid disilicon hexachloride reacts with water to form solid silicon dioxide, hydrogen chloride gas and hydrogen gas are

[tex]Si{2}Cl{6} (l) + 4H{2}O (l) ------ > 2SiO{2} (s) + 6HCl (g) + H{2} (g)[/tex]

When liquid disilicon hexachloride reacts with water to form solid silicon dioxide , hydrogen chloride gas and hydrogen gas , the following chemical equation is:

[tex]Si{2}Cl{6} (l) + H{2}O (l) ------ > SiO{2} (s) + HCl (g) + H{2} (g)[/tex]

now , we have to balance the eqaution,

                   Reactants            product

Si                      2                          1

Cl                      6                          1

H                      2                           3

O                      1                            2

Multiply 4 with [tex]H{2}O[/tex]  2 with  [tex]SiO{2}[/tex]  and 6 with HCL, we get

[tex]Si{2}Cl{6} (l) + 4H{2}O (l) ------ > 2SiO{2} (s) + 6HCl (g) + H{2} (g)[/tex]

now ,

                  Reactant       Product

Si                     2                   2

Cl                     6                   6

H                      8                   8

O                    4                     4

Thus, we get the desire equtions.

The liquid disilicon hexachloride reacts with water to form solid silicon dioxide, hydrogen chloride gas and hydrogen gas are

[tex]Si{2}Cl{6} (l) + 4H{2}O (l) ------ > 2SiO{2} (s) + 6HCl (g) + H{2} (g)[/tex]

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According to the research, the correct options are faults and mountains. These are features form along all types of plate boundaries.

They are the contact areas of the lithosphere between plates, we call them boundaries or edges, where new oceanic crust is formed and in which the plates separate, there are three plate boundaries which are:

In this sense, since they are areas of great geological activity, they have a varied topography since tensional forces are produced that cause their movement that forms mountains and fault blocks.

Therefore, we can conclude that according to the research, the correct options  are faults and mountains. These are features form along all types of plate boundaries.

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Answer:

A

Explanation:

Elements below and above each other belongs to same group.

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The three variables in the density equation are the mass of the substance, the volume of the substance, and the density of the substance.

A variable is a characteristic that can be measured (such as mass, acceleration, volume, height, etc.) and that can take on different values.

An experiment typically has three types of variables:

Now, in density equation i,e,. Density = Mass/Volume.

The volume of the substance is the independent variable, while its mass is the dependent variable, because as the volume of the substance increases, so does its mass. As a result, mass depends on volume.

Density, on the other hand, is the controllable variable because its mass-to-volume ratio remains constant for any particular substance.

Thus, in the density equation, mass is the dependent variable, volume is the independent variable and density is the controlled variable.

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The most beneficial towards maintaining the equilibrium in an ecosystem over a long period of time is to Diversity of organism.

A ecosystem maintains equilibrium by ensuring that each organism has resources and proper living condition fort the survival.  four factors balance an ecosystem is water cycle, mineral cycle, energy flow and community dynamics. An ecosystem is place where plants and other organism interact with nonliving factor like weather.

Biodiversity or biological diversity , refers to all the variety of life that exist on earth. our planet is full of variety of living organisms .An ecosystem must have the greatest amount of producers, followed by primary consumers and having smallest no. of tertiary consumers.

hence,The most beneficial towards maintaining the equilibrium in an ecosystem over a long period of time is to Diversity of organism.

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Answer:

concentrated=strong

dilute=weak

Water is a polar molecule. Since oxygen has a slightly negative charge and each hydrogen has a slight positive charge, this allows water molecules to form a hydrogen bond.

Water is a polar molecule. It is a very important solvent. It is also called a universal solvent. In water, Oxygen is a negative charge molecule and hydrogen is a positive charge.

Small negative charges on oxygen atoms in other water molecules are drawn to the small positive charges on hydrogen atoms in a water molecule. A hydrogen bond is a name given to this weak attraction. Different charges are drawn to one another.

Hydrogen bonds are very weak. The water molecules are charged molecules. The positively charged hydrogen attracts the negatively charged hydrogen atoms.

Therefore, Water is a polar molecule. Since oxygen has a slightly negative charge and each hydrogen has a slight positive charge, this allows water molecules to form a hydrogen bond.

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Benedict's test should be done to prove it.

Glucose is the main sugar which is mainly found in our blood. it is present in carbohydrate products. People with fructose intolerance should avoid peas because it contain a lot of fructose

Benedict's test is a test where chemicals are used to check the presence of sugar in a particular substance. The sugar that is present in the substance will react with the reducing sugar present in the substance on heating. the positive result is shown by the colour change from clear blue to brick red precipitate.

Pea contains a lot of fructose and it can be proved by doing benedict test.

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