If many observations or results of experiments fail to agree with your deductive reasoning, then:

the general principle or theory is probably false.
the general principle or theory is probable true.

Each shell can contain only a fixed number of electrons: The first shell can hold up to two electrons, the second shell can hold up to eight (2 + 6) electrons, the third shell can hold up to 18 (2 + 6 + 10) and so on.

Mass of strontium = 88 g

Atomic mass of Sr = 87.62 u

Moles = mass /atomic mass

Moles of Sr =  88 / 87.62 = 1.004

Mass of bromine = 160 g

Atomic mass of Br = 79.904 u

Molar mass of Br₂ = 79.904 x 2 = 159.808 g/mol

Moles = mass /molar mass

Moles of Br₂ =  160 / 159.808 = 1.001

The balanced chemical equation of the reaction between strontium and bromine:

Sr(s) + Br₂(l) = SrBr₂

The molar ratio between Br₂  and SrBr₂ is 1:1

So the moles of SrBr₂ produced from 1.001 moles of Br₂ is 1.001.

Moles = mass /molar mass

Mass = moles x molar mass

Molar mass of SrBr₂ = 247.4280 g/mol

Mass = 1.001 mol x 247.4280 g/mol

Mass = 247.428 g

The mass of strontium bromide produced is 247.428 g.

Explanation: For evaluating the combined gas law, we use four laws:

Charles' Law: Volume of a gas is directly proportional to the Temperature at Constant Pressure.

                           [tex]V\propto T[/tex]      (at constant Pressure)

Boyle's Law: Volume of a gas is inversely proportional to the Pressure of a gas at constant Temperature.

                           [tex]V\propto \frac{1}{P}[/tex]   (at constant Temperature)

Gay-Lussac's Law: Pressure of the gas is directly proportional to the Temperature at constant Volume.                                                                  

                           [tex]P\propto T[/tex]      (at constant Volume)

Avogadro's Law: Volume of gas is directly proportional to the number of moles of gas at constant Pressure and constant Temperature.

                          [tex]V\propto n[/tex]      (at constant Pressure and Temperature)

Combining all the four laws, we get

                           [tex]PV\propto nT[/tex]

                            PV=nRT     (Combined Gas Law)

where, R = Gas constant

Now, we need to calculate the pressure, rearranging the terms:

                          [tex]P=\frac{nRT}{V}[/tex]

When an ideal gas at Initial Pressure [tex]P_1[/tex], Volume [tex]V_1[/tex] and Temperature [tex]T_1[/tex] undergoes change in variables to Final pressure [tex]P_2[/tex], Volume [tex]V_2[/tex] and Temperature [tex]T_2[/tex] , we write

                         [tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]

                        [tex]P_2=(\frac{P_1V_1}{T_1})(\frac{T_2}{V_2})[/tex]

Answer : The variables in the numerator (a) will be, [tex]P_1,V_1,T_2[/tex] and the variables in the denominator (b) will be, [tex]V_2,T_1[/tex]

Explanation :

The combined gas law has arrived from the combination of the four laws:

1) Boyle's Law : It is defined as the pressure of the gas is inversely proportional to the volume of the gas at constant temperature and the number of moles.

[tex]P\propto \frac{1}{V}[/tex]

2) Charles' Law : It is defined as the volume of the gas is directly proportional to the temperature of the gas at constant pressure and number of moles.

[tex]V\propto T[/tex]

3) Gay-Lussac's Law : It is defined as the pressure of the gas is directly proportional to the temperature of the gas at constant volume and number of moles.

[tex]P\propto T[/tex]

4) Avogadro's Law : It is defined as the volume of the gas is directly proportional to the number of moles of the gas at constant pressure and temperature.

[tex]V\propto n[/tex]

By combining these four laws, we get the combined gas law.

[tex]PV\propto nT\\\\PV=nRT[/tex]

where, R = gas constant

An ideal gas at initial pressure [tex]P_1[/tex], initial volume [tex]V_1[/tex] and initial temperature [tex]T_1[/tex] undergoes changes with the variables to final pressure [tex]P_2[/tex], final volume [tex]V_2[/tex] and final temperature [tex]T_2[/tex].

By rearranging the gas law, we get the final pressure.

[tex]\frac{P_1V_1}{P_2V_2}=\frac{T_1}{T_2}\\\\P_2=\frac{P_1V_1T_2}{V_2T_1}[/tex]

Therefore, the variables in the numerator (a) will be, [tex]P_1,V_1,T_2[/tex] and the variables in the denominator (b) will be, [tex]V_2,T_1[/tex]

Scientists use land surface temperature maps to analyze and forecast changes in Earth's climate, studying variables such as glaciers, river levels, tree rings, and greenhouse gases.

Scientists use a land surface temperature map in various ways to analyze and forecast changes in the Earth's climate. One method is by examining previous and present data, such as the dimensions and locations of glaciers, and the levels of lakes, rivers, and oceans. This can reveal patterns related to global warming and other temperature changes.

Another method is by examining the number and condition of annual rings in trees. The thickness and appearance of these rings can provide information about the climate in various eras. A third approach is analysis of greenhouse gases in the atmosphere, which can point to climactic changes over the years.

Scientists also use temperature maps to model weather patterns, incorporating data about pressure (which can be depicted on the same maps) and solar energy. This can be particularly useful for predicting the path and impact of notable weather events like hurricanes. All of these methods contribute to our understanding of the Earth's climate and how it might change in the future.

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They would be arranged in a trigonal planar orientation.

If there were only three electron groups around an atom they tend to repel each other and gain a trigonal planar orientation. A molecule with three electron groups orients the three groups as far apart as possible. They adopt the positions of an equilateral triangle 120° apart and in a plane. The shape of such molecules is trigonal planar. An example is BF3:

Answer:

trigonal planar orientation.

Explanation:

Hey there!:

1 mole of FeSO4 = 151.8 g/mol

25.0 g change to mole  = 25.0 / 151.8

moles of FeSO4 = 0.165 moles

One mole of any substance has  6.02*10²³ units

0.165 moles to get the number of Fe ( II ) ions :

number of  Fe(II) ion = 0.165 * ( 6.02*10²³ )

number of Fe ( II ) ion = 9.93*10²² units

Answer:

[tex]ions_{Fe^{2+}}=9.90x10^{22}ionsFe^{2+}[/tex]

Explanation:

Hello,

In this case, the following mole-mass relationship, is applied to obtain the ions of iron (II) in 25.0 g of iron (II) sulfate whose molar mass is 152 g/mol:

[tex]ions_{Fe^{2+}}=25.0gFeSO_4*\frac{1molFeSO_4}{152gFeSO_4}*\frac{1molFe^{2+}}{1molFeSO_4}*\frac{6.022x10^{23}ionsFe^{2+}}{1molFe^{2+}} \\ions_{Fe^{2+}}=9.90x10^{22}ionsFe^{2+}[/tex]

Best regards.

Water (H2O) and Sodium (Na) are reactants.

2H2O+2Na......2NaOH+H2

In the above reaction the water (H2O) and sodium (Na) are reactants and sodium hydroxide (NaOH) and hydrogen are products.

And this is the single displacement reaction.

Final answer:

In the equation 2H2O + 2Na → 2NaOH + H2, water (H2O) and sodium (Na) are the reactants, while sodium hydroxide (NaOH) and hydrogen gas (H2) are the products.

Explanation:

In the chemical reaction 2H2O + 2Na → 2NaOH + H2, the reactants are the substances that start the reaction. In this case, the reactants are water (H2O) and sodium (Na). When sodium metal is placed in water, a reaction occurs where these reactants transform into the products, which are sodium hydroxide (NaOH) and hydrogen gas (H2).

Specifically, solid sodium reacts with liquid water, producing molecular hydrogen gas and ionic compound sodium hydroxide, which is a solid in pure form but readily dissolves in water to form an aqueous solution.

100 mL of water weighs 100 g.

If 100 mL of a liquid that weighs only 20g, it cannot be water because of the great difference in density, unless there is an enormous error in the weighing process.

The scientists study seismographs to know about the force and the time duration of the earthquake.

The instrument known as seismogram  that makes a record of seismic waves create because of the  earthquake and explosion, or other Earth-shaking phenomenon.

Seismographs are made up  with electromagnetic sensors that then translate ground motions into change in electrical field , which are then processed and recorded by the instruments for further analysis.

Therefore, scientists study seismographs to know about the force and the time duration of the earthquake.

Learn more about seismographs ,here:

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Hey There!:

Molar mass O2 => 32.0 g/mol

Molar mass Cl2 => 71.0 g/mol

effusion rate α  1 / (√ molar mass )

E Cl2 / E O2 = √ molar mass O2 / √ molar mass Cl2

E Cl2 / E O2 =   ( √ 32.0 ) /  ( √ 71.0 )

=> 0.671

Hope that helps!

Answer: The ratio of rate of effusion of chlorine gas and oxygen gas will be 0.671

Explanation:

To calculate the rate of diffusion of gas, we use Graham's Law.

This law states that the rate of effusion or diffusion of gas is inversely proportional to the square root of the molar mass of the gas. The equation given by this law follows the equation:

[tex]\text{Rate of diffusion}\propto \frac{1}{\sqrt{\text{Molar mass of the gas}}}[/tex]

We are given:

Molar mass of chlorine gas = 71 g/mol

Molar mass of oxygen gas = 32 g/mol

By taking their ratio, we get:

[tex]\frac{Rate_{Cl_2}}{Rate_{O_2}}=\sqrt{\frac{M_{O_2}}{M_{Cl_2}}}[/tex]

[tex]\frac{Rate_{Cl_2}}{Rate_{O_2}}=\sqrt{\frac{32}{71}}\\\\\frac{Rate_{Cl_2}}{Rate_{O_2}}=0.671[/tex]

Hence, the ratio of rate of effusion of chlorine gas and oxygen gas will be 0.671

Answer: Option (A) is true.

Explanation:

In a laboratory, the solutions are prepared in advance so that as and when the need arises they can be easily available. As these solutions are prepared by keeping in mind the correct ratio of concentrations.

Hence, when a person need to fill a test tube with hydrochloric acid then he/she just need to find the bottle of acid and pour the contents into the test tube.

Thus, it can be conclude that the statement is true.

Answer: True

Explanation:

In a laboratory if someone needs a test tube full of hydrochloric acid then it should be directly poured into the test tube.

As required in the experiment or during the experiment, the hydrochloric acid is pored and used in the experiment.

During the time of experiment the concentration of HCl can be adjusted base on the type of experiment.

So, it is true that hydrochloric acid can be poured directly in the test tube from the bottle.

Because it is just simply bigger a na is way way smaller than a ci.

Ionic radii of cations:

When you form a metal cation, you are removing the outermost electrons and revealing the inner core.  

For example, to form an Na⁺ ion you must remove a 3s electron from an Na atom, exposing the 2s and 2p subshells.

The n = 2 shell is smaller than an n= 3 shell, so an Na⁺ ion is smaller than an Na atom (as in the image below).

Ionic radii of anions:

When you form an anion, you are adding electrons to the outermost shell. These electrons (a) increase the shielding from the nucleus and (b) repel all the other electrons.  

The decreased nuclear attraction and the electronic repulsions cause the electron cloud to expand, so a Cl⁻ ion is larger than a Cl atom.

Hello!

To find the number of moles in the given amount of aluminum, we need to know the mass of one mole of aluminum, and divide that by the given amount of aluminum.

One mole of aluminum is equal to about 27 grams. With that, we can divide it by the given amount of aluminum.

198.5 grams / 27 grams ≈ 7.35185185

According the number of significant figures, there are about 7.4 moles of aluminum in 189.5 grams of aluminum.

Most of these questions relate to the Doppler Effect - how the frequency of sound and light waves changes depending on whether the source is moving towards or away from the observer. Moving toward an observer leads to higher frequencies and a 'blue shift' while moving away leads to lower frequencies and a 'red shift'.

1. As an object moves towards another object the sound waves bunch up. True. This is a representation of the Doppler Effect where the frequency appears to change when a source of sound is moving relative to the observer.

2. As an object moves toward another object the sound waves have a lower frequency. False. As the object moves closer, the sound waves will have a higher frequency.

3. As an object moves toward another object the sound waves have a lower frequency. False as explained in the question.

4. Faster sources moving towards an object have a higher pitch than slower-moving sources. True. Faster moving sources will cause the sound waves to bunch up leading to higher frequency and hence greater pitch.

5. An object moving away will have a lower pitch. True. The pitch will appear to be lower as the sound waves are spread out.

6. Lower shows differences in frequency as color. This sentence is not clear enough to provide an accurate response.

7. An object moving away to be blue-shifted. False. An object moving away shows a red shift; a blue shift occurs when an object is moving toward the observer.

8. Is a star that shows as blue-shifted moving toward the observer. True. The blue shift indicates that a cosmos object is moving towards us.

9. Faster-moving objects show MORE shifts in frequency. True. The frequency of light waves will change more noticeably with faster-moving objects due to the Doppler effect.

10. Galaxies appear to be redshifted from observing on Earth. Is this because they are moving towards the earth? False. Galaxies are moving away from the Earth which is why they appear redshifted.

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Answer: Option (c) is the correct answer.

Explanation:

In liquids, molecules are held by slightly less strong intermolecular forces of attraction as compared to solids.

Hence, molecules of a liquid are able to slide past each other as they have more kinetic energy than the molecules of a solid.

As a result, liquids are able to occupy the shape of container in which they are placed. Also, liquids have fixed volume but no fixed shape.

Thus, we can conclude that liquids have a variable shape and a fixed volume.

Answer:

variable, fixed

Explanation:

Answer: The answer is A

Explanation: I know this because I just did the USA test-prep

Answer:

On the basis of the given information, the dominant allele must be for black fur and the recessive allele must be for white fur.

Explanation:

A variation of a gene, which will generate a certain phenotype, even in the existence of other alleles is known as a dominant allele. On the other hand, a version of a gene that needs to be homozygous when inherited in order to be articulated in the phenotype is known as a recessive allele. The offspring will not express the phenotype of the recessive allele if it is inherited together with a dominant allele, that is, the phenotype of the dominant allele will just be expressed.

look it nup on google should help

Final answer:

The density of water decreases slightly below 1000 kg/m³ as temperatures increase from 4°C to 50°C. At 150°C, water would be a gas with much lower density. This behavior is due to the unique molecular structure and hydrogen bonding in water.

Explanation:

The question regarding the density of water at different temperatures touches on fundamental principles of chemistry and physics. The unique properties of water mean that its density does not simply decrease linearly with temperature. Instead, due to hydrogen bonding and molecular structure, water is at its densest at around 4°C. As the temperature increases from 4°C, the density of liquid water decreases due to increased molecular movement that causes water molecules to occupy more space. Therefore, at 50°C, we can predict the density of water would be slightly lower than its maximum density at 4°C, likely a little under 1000 kg/m³. At 150°C, water would be in a gaseous state under normal atmospheric pressure, and thus its density as a gas would be significantly lower than as a liquid.

The molecules in a gas move faster than in a liquid.

Yes, it is possible to combine the same two elements to form two different compounds. An example is carbon dioxide CO2 and carbon monoxide CO. This is because two elements can form different types of bond and end up with different compounds.

There is a limited number of elements but a large number of compounds because of the above reason.

Yes, two different compounds can be made from the same two elements by altering their atomic ratios. Despite having fewer than 120 elements, innumerable compounds exist due to various ways elements can combine and bond.

A. This is because different compounds can be created by changing the ratio of atoms of each element. For instance, depending on the number of oxygen atoms bonded to each carbon atom, carbon and oxygen can combine to form carbon monoxide (CO) or carbon dioxide (CO₂).

B. The reason for this is that elements can combine in a variety of ways, resulting in a wide range of compounds with distinct properties. For example, even if two elements form a compound in the same ratio, they can combine in different ratios to form entirely different compounds.

Factors influencing compound formation

When multiplying 2.3 mm by 8.00 mm to find area, how should you report your answer?

A. 18 mm^2

The Pascal (symbol: Pa) is the SI derived unit of pressure. It is used to quantify internal pressure, stress, Young's modulus and ultimate tensile strength. It is defined as one Newton per square meter. It is named after the French polymath Blaise Pascal.

The Pascal (Pa) or kilo pascal (kPa) as a unit of pressure measurement is widely used throughout the world and has largely replaced the pounds per square inch.

The SI unit of pressure is the Pascal (Pa) and it is derived from the base units of the International System of Units (SI): kilogram (kg), meter (m), and second (s).

The SI unit of pressure is the Pascal (Pa). It is derived from the base units of the International System of Units (SI): kilogram (kg), meter (m), and second (s).

One Pascal is defined as one Newton per square meter (N/m^2). This means that pressure is the force applied per unit area.

For example, if you have a force of 100 Newtons acting on an area of 1 square meter, the pressure would be 100 Pascals.

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The more solid a substance is, the less kinetic energy there is. This is because there is not a lot of space for the atoms in the solid state to move. However, in the gaseous state, the atoms are far apart with plenty of space, this lets them create a lot more kinetic energy. Solids have a lot more intermolecular forces because the atoms are together. The IMF (intermolecular force) is what lets the atoms/molecules stick together. In the solid state, all the atoms are stuck together with little to no room in between. In the liquid state, it has a lot of IMF but is weaker then the IMF in the solid state. This is why you have so much resistance when you try to move through water. In the gaseous state, there is little to no IMF because the atoms are all so far apart. This makes it easier for everyone to move around.

To answer your question more directly: As the substance is heated to its melting point, there is an increase in kinetic energy, but decrease in intermolecular forces.

As a substance is heated, the increase in kinetic energy of its particles overcomes the intermolecular forces holding them together, leading to the substance's melting.

When a substance is heated, the kinetic energy of its particles increases. The molecules in the substance start moving faster, which essentially means that their kinetic energy is increasing. This increase in kinetic energy helps overcome the forces of attraction holding the molecules together, or the intermolecular forces.

As this heat energy continues to be applied, the molecules gain enough energy to break free from these attractive forces leading to the transformation from a solid to a liquid. This energy required to change a solid into a liquid at its melting point is referred to as the heat of fusion. The higher the intermolecular forces in a substance, the higher the kinetic energy (or heat) needed to get the substance to melt.

Therefore, in summary, heating a substance increases the kinetic energy of its particles, which helps overcome the intermolecular forces that hold the particles together, leading to the melting of the substance when the particles have enough energy to break free.

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to be as exact as i can it is all of them they all work together to make water good.

ANSWER:

We don't get an eclipse all period because the Moon's revolution is turned at  approximately 5∘ to the ecliptic.

EXPLANATION:

If the Moon's revolution was in the equal level as the Earth's we would encounter two  eclipses all period. A solar eclipse would appear every new moon also a lunar eclipse  would appear every full moon. As the Moon's orbit is turned at 5∘ to the ecliptic, an  eclipse can simply happen when the Moon is near one of its links which are the points  where the Earth and Moon circles intersect. The line joining the links also has to be  facing towards the Sun.

Final answer:

A protein is best described as a polymer made up of 20 or more amino acid monomers, with proteins varying greatly in size and function.

Explanation:

The correct statement that best describes a protein is (D) a polymer made up of 20 or more amino-acid monomers. Proteins are essential biomolecules within living organisms, made from building blocks known as amino acids, which are connected by peptide bonds forming long chains. There are 20 standard amino acids that can combine in various sequences to form a vast array of proteins, each with unique functions and properties. These proteins can be as small as a few dozen amino acids to several thousand in the larger proteins.