Write out the rule for determining total magnification of a compound microscope

yea the answer is true

Answer: 17.04 km/L

Explanation:

Given: An automobile can travel 40.0 miles on one gallon of gasoline

That is 40 miles/ gallon

Now using the conversion factor :

1 mile = 1.61 km

Thus 40 miles =[tex]\frac{1.61}{1}\times 40=64.4km[/tex]

Alsousing the conversion factor

1 gallon = 3.78 L

Thus [tex]40miles/gallon[/tex] will be [tex]\frac{64.4km}{3.78L}=17.04km/L[/tex]

Thus the answer is 17.04 km/L.

Answer : The answer will be 29.74 g/mL

Explanation :

As we are given an expression :

Divide 94.20 g by 3.16722 mL.

To solve this problem, we use division operation. So,

[tex]\frac{94.20g}{3.16722mL}[/tex]

By solving the term, we get:

[tex]\Rightarrow 29.74g/mL[/tex]

According to the significant rule of division, the least number of significant figures in any number of the problem determines the number of significant figures in the answer.

In the given expression, 94.20 has 4 significant figures and 3.16722 has 6 significant figures. From this we conclude that 4 is the least significant figures in this problem. So, the answer should be in 4 significant figures.

Thus, the answer will be 29.74 g/mL

Answer :

The correct answer is option B.

Explanation :

Significant figures : The figures in a number which express the value of magnitude of a quantity to a specific degree of accuracy is known as significant digits.

Given value = 0.0952

[tex]0.0952 km\approx 0.095 km[/tex]

'Zeros' before and after decimal point are insignificant. But when 'zeros' is coming between two numerals then it is count as significant.

The percent sugar concentration of orange soda is calculated by dividing the mass of the sugar by the total mass of the beverage and multiplying by 100. For a 355 mL serving of soda with a density of 1.043 g/mL and sugar content of 49g, the percent sugar concentration is approximately 13.24%.

The question asks to calculate the percent sugar concentration in orange soda, given the amount of sugar and the volume and density of the soda. The mass of the beverage can be calculated by multiplying its volume by the density, and the percent concentration is then obtained by dividing the mass of sugar by the total mass of the solution and multiplying by 100.

To find the mass of the soda, we use the formula: mass = volume × density. So, for a 355 mL serving with a density of 1.043 g/mL, the mass of the soda is calculated as follows:

Mass of soda = 355 mL × 1.043 g/mL = 370.265 g

Next, we calculate the percent concentration of sugar:

Percent sugar concentration = (mass of sugar / total mass of the beverage) × 100
Percent sugar concentration = (49g / 370.265g) × 100
Percent sugar concentration ≈ 13.24%

Therefore, the percent sugar concentration of the orange soda is approximately 13.24%.

The atomic numbers of the as yet undiscovered next two members of the series are 118 and 168.

The noble gases is a group of chemical elements with similar properties such as under standard conditions they are all odorless, colorless, monatomic gases with very low chemical reactivity.

The heaviest known noble gas metal is radon, atomic number 86. Where The outermost shell configuration of radon is [tex]6s^2 6p^6[/tex]

Electronic configuration of the next noble gas is:

[tex][Rn]5f^14 6d^{10} 7s^2 7p^6[/tex]

Therefore, atomic number of the noble gas after Rn is 86+32 = 118

The atomic number is the number of protons found in the nucleus of every atom of that element.

Electronic configuration of still the next noble gas can be obtained by adding  [tex]5g^18 6f^{14} 7d^{10} 8s^2 8p^6[/tex], which means 50 more electrons.

So the atomic number = 118 + 50 = 168

Therefore the atomic numbers of the as yet undiscovered next two members of the series are 118 and 168.

Grade:  9

Subject:  Chemistry

Chapter:  the atomic numbers

Keywords: the atomic numbers, radon, Electronic configuration, electrons, the noble gas

Iron's density is about 7.9 times greater than that of water. This is calculated by dividing the density of iron (7.9 g/cm³) by the density of water (1 g/cm³).

The density of iron is approximately 7.9 g/cm³, while the density of water is 1 g/cm³ under standard conditions. Therefore, to find how many times greater the density of iron is compared to water, you can perform a simple division: 7.9 g/cm³ (density of iron) divided by 1 g/cm³ (density of water).

This calculation reveals that iron is about 7.9 times denser than water.

When working through density problems, it's important to compare densities in the same units. Since the density of water is taken as a baseline of 1 g/cm³, it allows for an easy comparison with other substances.

In the case of iron, this substantial difference in density has practical implications, such as the fact that iron sinks in water and is used for constructions that require strength and weight, like rebar. This density also affects the speed of sound travel, as it moves faster through iron than through air because of iron's higher rigidity and density.

From reference or science books, we can actually know that the elementary charge of phosphorus is -3. Since it is negative, this means that it has an excess of electrons, which further means that it takes up 3 electrons to become an ion. Therefore the equation can be written as:

P  +  3e  --->  P3- 

Answer: [tex]P+3e^-\rightarrow P^{3-}[/tex]

Explanation: Phosphorous atom is the element with atomic number 15 and thus contains 15 electrons.

[tex]P:15:1s^22s^22p^63s^23p^3[/tex]

Thus it is short of 3 electrons to attain stable noble gas configuration. Thus it gains three electrons and converts to phosphide ion [tex](P^{3-})[/tex] with 18 electrons.

[tex]P^{3-}:18:1s^22s^22p^63s^23p^6[/tex]

To determine if a beaker of clear, colorless liquid has dissolved salt, you can perform several tests such as a conductivity test, density comparison (float an egg), evaporation to observe residue, or a silver nitrate test to check for the presence of chloride ions.

To determine whether a clear, colorless liquid in a beaker has dissolved table salt, one can't rely on sight, taste, or smell as salt solution is clear, odorless, and we want to avoid tasting it. However, one can utilize certain properties of salt when it's in a solution.

One such property is that a salt solution conducts electricity. This is due to the presence of ions in the solution formed when the salt, sodium chloride (NaCl), dissolves into sodium ions (Na+) and chloride ions (Cl-). You can perform a simple conductivity test. If the solution conducts electricity, it could signify the presence of table salt in the water.

Another method can be based on the principle of density. Salt water has a higher density than pure water. One way to use this difference is to float an egg in the solution. If an egg floats, there is a good chance the water contains salt because the salt increases the water's density, allowing the egg to float.

Evaporation is another method. By carefully evaporating the water, one would be left with any soluble substances that were present. If there are white, crystalline residues (which are characteristic of table salt), it indicates that the liquid contained dissolved table salt.

Lastly, a silver nitrate test could also be done. If you add a few drops of silver nitrate solution to the sample, and a white precipitate forms, this indicates the presence of chloride ions and hence, salt in the solution.

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Answer:

Nitrogen in the gas phase is attracted by weaker inter-molecular forces.

Further details:

Nitrogen has London dispersion forces which have weak inter-molecular interactions.

London dispersion forces:

The London dispersion force is the feeblest inter-molecular force, and is a temporary attractive force that results when the electrons in two adjacent atoms positions that make the atoms form transitory dipoles. This force is sometimes called an induced dipole attraction. London forces are the attractive forces that root non-polar substances to reduce to liquids and to freeze into solids when the temperature is dropped adequately.

London force (fluctuating dipole–induced dipole), which rises due to the non-zero immediate dipole moments of all atoms and molecules is a type of weak inter-molecular interaction. Such polarization can be persuaded either by a polar fragment or by the repulsion of negatively charged electron clouds in non-polar molecules. Thus, London interactions are produced by accidental variations of electron compactness in an electron cloud. An atom with a large number of electrons will have a greater related London force than an atom with fewer electrons. The dispersion (London) force is the most significant constituent because all materials are polarizable, whereas Keesom and Debye forces need permanent dipoles. The London interaction is universal and is present in atom-atom interfaces as well. For numerous causes, London interactions (dispersion) have been deliberated relevant for interactions between macroscopic bodies in reduced systems.

Answer details:

Subject:  Chemistry

Level:  High school

Keywords:

• Nitrogen

• London dispersion forces

• Weak molecular attraction

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Final answer:

Potassium has an atomic number of 19, which means there are 19 protons in the nucleus of a potassium atom.

Explanation:

The atomic number of an element, such as potassium, is defined as the number of protons in the nucleus of an atom of that element. Since potassium has an atomic number of 19, there are 19 protons in the nucleus of a potassium atom. Additionally, this atomic number also means that a neutral atom of potassium would have 19 electrons. The electron configuration code for potassium, reflecting the arrangement of these 19 electrons in different shells or energy levels, can also be determined based on its atomic number.

Answer:

 D)  sublimation.

Explanation:

took the test

Sublimation is the transition of a solid directly to gas. it can be seen as temperature moves to the right at very very low pressures.

Explanation:

It is known that before melting ice cream is present in a solid state so, its molecules are much closer due to which it has retained its shape.

But as its molecules absorb energy from the surroundings the they tend to gain kinetic energy. Due to this there will be increase in collision between its particles and they will move apart from each other. As a result, ice cream will start to melt.

Therefore, when ice cream melts and forms a liquid then molecules move away from each other at the molecular level.