What do electromagnetic waves consist of? (choice)
*frequency
*electric & magnetic fields
*longitude

Answer:

The correct answer is option b. Hypothesis.

Explanation:

The hypothesis is an idea or a guess that is formulated on the observation of a problem or natural phenomenon which is based on prior knowledge or research.

The hypothesis is not a random guess and it is also not a well-sustained explanation, it lies in between. The hypothesis is generally formed to prove or test if it is true or not.

Thus, the correct answer is option - b. Hypothesis.

Each element or compound has a molar mass, which is calculated by multiplying the atomic mass of each element by the amount of atoms of that element, and summing the results of each element. The molar mass is measured in g/mol. So you divide the mass in grams by the molar mass to get the amount of moles.

Example:

There are 5g of water.

Calculate the amount of moles.

The water's formula is H2O, so the molar mass of it is

[tex]2 \times 1 + 1 \times 16 = 18[/tex]

g/mol.

The amount of moles is:

5g ÷ 18g/mol ~ 0.28mol

To convert grams to moles, determine the molar mass of the substance, then divide the mass in grams by the molar mass to find the number of moles.

Converting from grams to moles is a fundamental skill in chemistry that involves using the molar mass of a substance as a conversion factor. The molar mass can be found on the periodic table and is commonly expressed in grams per mole (g/mol). Here’s how you can convert grams to moles:

For instance, to convert from grams to moles of I2, you would divide the given mass of I2 by its molar mass, resulting in the number of moles (e.g., 0.363 mol).

These steps can be part of a more extensive mole-mass calculation, but this simple conversion involves only the molar mass to convert between grams and moles directly.

Ionic compounds have high enthalpy of fusion and high enthalpy of vaporization. High heat is required to melt and vaporize ionic compounds because ionic compounds are formed between cation and anion and the oppositely charged ions are held by strong electrostatic force of attraction.  

Ionic compounds form crystal lattice in which there is alternate arrangement of cation and anion in an array of three dimensional space. Ionic compounds do not form amorphous solids.  

The scientist that was the first to use the telescope in astronomy was Newton

D, air bags protect people during car crashes

Im sure its D

Empirical formula has the lowest number (simplified) version in an equation of molecules

Answer

MnO₄ + 2H⁺ +3NO₂⁻ →3NO₃⁻ + Mn²⁺ +H₂O

Explanation

This is a redox reaction (oxidation-reduction reaction) which involves the transfer of electrons between two species. i.e

Mn + 6e⁻→Mn²⁺ (reduction)

3N³⁺- 6e⁻→3Mn⁵⁺(oxidation)

MnO4- + H2O + NO2- = MnO2(s) + NO3- + OH-

MnO4- + H2O + NO2- ⇄ MnO2(s) + NO3- + OH-

Answer:

1. Heterogeneous: Mixtures in which composition is not uniform throughout. For example, soil.

2. Homogeneous: Mixtures that have uniform composition throughout. For example, air.

3. Solute: the component of a solution which is present in smaller quantity. For example, Sugar in water

4. Solvent: the component of a solution which is pr3esent in larger quantity. For example, water

5. Solution: A solution is a homogeneous mixture of two or more substances. For example brass.

6. Mixture: When two or more compounds or elements mix up physically they from a mixture.

7. Colloid: Solutions in which particles are large and possess the characteristics of the Tyndall effect. For example milk.

8. Dissociation: the splitting of a molecule into smaller molecules is called dissociation.

9. Pure substance: A pure substance is a type of matter having definite properties.

10. Suspension: Suspensions are heterogeneous mixtures of undissolved particles. For example milk of magnesia.

11. Element: element is a substance made up of the same number of atoms.For example hydrogen

12. Compound: Compound is a substance made up of two or more elements. For example water.

12. Compound is defined as a substance formed when two or more atoms are chemically bonded together.

These atoms can be of the same or different elements, and they create a unique chemical structure with properties distinct from the individual elements. Compounds cannot be separated into their constituent elements through physical means; rather, they require chemical reactions to break the bonds between the atoms.

Because compounds are formed through chemical bonding, they are considered pure substances, as they exhibit consistent and uniform properties throughout. An example of a compound is water (H₂O), which consists of two hydrogen atoms and one oxygen atom bonded together.

Electronegativity is the tendency of a bonded atom to attract electrons to itself. The difference in electronegativity ( Δ EN) between bonded atoms can indicate whether the bond is nonpolar, polar covalent, or ionic. This is what I found. Hope it helps.

Electronegativity plays a fundamental role in determining bond polarity, as it shows how electrons distribute between the atoms in a bond. The difference in electronegativity between two atoms can suggest a bond's polarity and type. It helps defining if the bond is non-polar covalent, polar covalent or ionic.

Electronegativity is greatly involved in bond polarity. This is because electronegativity determines how shared electrons are distributed between two atoms in a bond. It's reflective of an atom's ability to pull electrons, or electron density, towards itself. Therefore, electrons in a polar covalent bond move closer to the more electronegative atom, giving it a partial negative charge (often denoted as δ-).

The difference in electronegativity between two atoms can provide a good estimation of a bond's polarity, and subsequently, its type. In the case where the difference is minute or non-existent, the bond tends to be covalent and non-polar. However, a more significant difference could suggest a polar covalent or ionic bond. For example, H-H bond is nonpolar, H-Cl bond is polar covalent, and Na-Cl is ionic due to their electronegativity differences of 0, 0.9, and 2.1, respectively.

In a polar covalent bond, one atom will have a partial positive charge (δ+) due to its lower electronegativity compared to the other atom which will have a partial negative charge (δ-). This distribution of charges gives rise to a bond dipole moment, which increases as the electronegativity difference increases, thus escalating bond polarity.

https://brainly.com/question/32125604

#SPJ3

The job duties of a forensic toxicologist include: Evaluating determinants or contributory factors in the cause and manner of death. Performing human-performance forensic toxicology, determining the absence or presence of drugs and chemicals in the blood, hair, tissue, breath, etc

gas vibrate and move freely at high speeds. liquid vibrate, move about, and slide past each other. solid vibrate (jiggle) but generally do not move from place to place.

It depends on the type of solid. All molecules in solid form have what is called vibration movement, meaning the move in fixed positions. In some solids the forces of attraction between the molecules are strong enough to keep the molecules in a relatively fixed position but allow some moment of molecules past one another.  but they also move to where you cant feel them.

hope this helped :)

Answer:

1) 1.235 g.

2) 0.61 g.

Explanation:

Al(OH)₃ + 3HCl → AlCl₃ + 3H₂O.

1.0 mol of Al(OH)₃ reacts with 3.0 moles of HCl to produce 1.0 mol of AlCl₃ and 3.0 moles of H₂O.

1) How many grams of HCl can a tablet with 0.880 g of Al(OH)₃ consume?

no. of moles of Al(OH)₃ = mass/molar mass = (0.880 g)/(78.0 g/mol) = 1.13 x 10⁻² mol.

∵ Every 1.0 mol of Al(OH)₃ needs 3.0 moles of HCl to be consumed.

∴ 1.13 x 10⁻² mol of Al(OH)₃ needs (3 x 1.13 x 10⁻² = 3.385 x 10⁻² mol) of HCl.

The no. of grams of HCl = no. of moles of HCl x molar mass of HCl = (3.385 x 10⁻² mol)(36.5 g/mol) = 1.235 g.

2) How much H₂O?

∵ Every 1.0 mol of Al(OH)₃ produces 3.0 moles of H₂O.

∴ 1.13 x 10⁻² mol of Al(OH)₃ produces (3 x 1.13 x 10⁻² = 3.385 x 10⁻² mol) of H₂O.

The no. of grams of H₂O = no. of moles of H₂O x molar mass of H₂O = (3.385 x 10⁻² mol)(18.0 g/mol) = 0.6092 g ≅ 0.61 g.

The final temperature of the air transferred from the tank to the tire can be determined by applying the ideal gas law equation rearranged to solve for the final temperature.

The question is dealing with the concepts of pressure, volume, and temperature in relation to gases, which can be analyzed using the ideal gas law. In this case, the air is being transferred from a larger tank to a smaller tire, with a decrease in pressure.

This forms the premise of an ideal gas law problem, with the formula PV = nRT (Pressure x Volume = n (number of moles) x R (gas constant) x Temperature). It's important to note that this law assumes the gas behaves 'ideally,' meaning it follows this law at all temperature and pressure conditions.

Given the initial condition of the tank (P1 = 125 psi, V1 = 75 L, T1 = 288 K) and the final conditions after the air is transferred to the tire (P2 = 25 psi, V2 = 6.1 L), and knowing both the initial and final state of the gas, we are supposed to find the new temperature (T2). Our unknown in this case is the final temperature inside the tire after the air has been transferred.

By rearranging the ideal gas law, we can express the final temperature as: T2 = (P2 x V2 x T1) / (P1 x V1) By substituting the given values into this equation, we can find the final temperature after the transfer of air.

https://brainly.com/question/30458409

#SPJ3

"The correct final temperature of the air in the tire is approximately 35.6 K.

To solve this problem, we can use the ideal gas law, which states that for a given amount of gas, the product of pressure (P) and volume (V) divided by the temperature (T) is constant:

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

Here, the subscript 1 refers to the initial conditions in the tank, and the subscript 2 refers to the final conditions in the tire.

[tex]\(P_1 = 125\)[/tex] psi (initial pressure in the tank)

[tex]\(V_1 = 75\) L[/tex] (initial volume in the tank)

[tex]\(T_1 = 288\)[/tex]K (initial temperature in the tank)

[tex]\(P_2 = 25\)[/tex]psi (final pressure in the tire)

[tex]\(V_2 = 6.1\)[/tex] L (final volume in the tire)

We need to find [tex]\(T_2\),[/tex] the final temperature in the tire.

First, we convert the pressures from psi to Pa (Pascals) because the ideal gas law requires consistent units, and the standard unit for pressure in the SI system is the Pascal. The conversion factor is 1 psi = 6894.76 Pa.

[tex]\(P_1 = 125 \times 6894.76\) Pa \(P_2 = 25 \times 6894.76\) Pa[/tex]

Now we can set up the equation using the ideal gas law:

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

Substitute the given values:

[tex]\[\frac{(125 \times 6894.76) \times 75}{288} = \frac{(25 \times 6894.76) \times 6.1}{T_2}\][/tex]

Now, solve for [tex]\(T_2\)[/tex]:

[tex]\[T_2 = \frac{(25 \times 6894.76) \times 6.1 \times 288}{(125 \times 6894.76) \times 75}\][/tex]

Simplify the equation by canceling out the common factors:

[tex]\[T_2 = \frac{25 \times 6.1 \times 288}{125 \times 75}\] \[T_2 = \frac{25 \times 6.1}{125} \times \frac{288}{75}\] \[T_2 = \frac{1}{5} \times 6.1 \times \frac{288}{75}\] \[T_2 = \frac{6.1}{5} \times \frac{288}{75}\] \[T_2 = 1.22 \times 3.84\] \[T_2 = 4.6928\] \[T_2 \approx 35.6\) K[/tex]

Therefore, the new temperature in the tire is approximately 35.6 K."

When benzoic acid and magnesium hydroxide are mixed, water and magnesium benzoate are produced. This is a neutralization reaction where the acid and base react to form a salt and water.

When benzoic acid (C6H5COOH) and magnesium hydroxide (Mg(OH)2) are mixed, water and magnesium benzoate (C14H10MgO4) are produced. This is a neutralization reaction where the acid and base react to form a salt and water. In this case, the benzoic acid acts as the acid and the magnesium hydroxide acts as the base. The reaction can be represented as:

C6H5COOH + Mg(OH)2 -> C14H10MgO4 + H2O

Both benzoic acid and magnesium hydroxide are dissolved in water in order for the reaction to occur. The resulting magnesium benzoate is a salt that is insoluble in water, so it precipitates out as a solid.

Can you send the attachment please so i can help you

Answer:

hi your question lacks the required options and diagram here is the complete question and diagram.

What must be true of the two highlighted triangles in the image? Check all that apply. | 1. The speed of the planet is the same for both triangles. | 2. The time frame is the same for both triangles. | 3. The area is the same for both triangles. | 4. The gravitational force is the same for both triangles.

Answer : The time frame is the same for both triangles ( 2 )

               The area is the same for both triangles ( 3 )

Explanation:

according to Kepler's second law of  planetary  motion which states that "That the line segment joining the planet and the sun sweeps equal areas during equal intervals of time"

according to Kepler's second law of planetary motion the highlighted triangles in the image the time frame and the area is the same for both of them and this is because they have line segments that joins the sun to the planet which is moving around the sun in a elliptical orbit. hence option 2 and option 3 is true for the highlighted triangles.

The theoretical percentage of oxygen in the calcium chlorate compound Ca(ClO3)2 is calculated by first finding the total molar mass of the compound and the molar mass of the oxygen within it. The molar mass of the entire compound is 206.98 g/mol, while the cumulative oxygen mass is 96.00 g/mol. The percentage of oxygen is therefore about 46.38%.

To calculate the theoretical percentage of oxygen in Ca(ClO3)2, you first have to know the molar mass of the compound and the molar mass of the oxygen in it. The molar mass of Ca(ClO3)2 is 206.98 g/mol, and oxygen appears 6 times (3 atoms per chloride ion and 2 chloride ions per formula unit), so the cumulative oxygen mass is 6*16.00 g/mol, or 96.00 g/mol. The percentage of oxygen can thus be calculated as (mass of oxygen / total mass) * 100%, or (96.00 g/mol / 206.98 g/mol) * 100% = approximately 46.38%.

https://brainly.com/question/678196

#SPJ3

C) The force becomes four times as much.

THANK MEE

Answer: The force becomes four times as much

The electric force is a force that is inversely proportional to the square of the distance. This can be proved by Coulomb's Law, which states:

"The electrostatic force  between two point charges  and  is proportional to the product of the charges and inversely proportional to the square of the distance  that separates them, and has the direction of the line that joins them"

Mathematically this law is written as:

   (1)

Where  is a proportionality constant.

Now, if we say  is the proton and  is the electron, and cut the distance between them in half, the new distance will be .

Substituting this new distance in equation (1):

  (2)

    (3)>>>As we can see, the force becomes four times stronger

Read more on Brainly.com - https://brainly.com/question/12378746#readmore

= 0.232 moles

Using the ideal gas Law ;

n = PV/RT ; Where, R is the ideal gas constant (0.0821 L atm / K mole), n is the number of moles, P is the pressure, V is the volume and T is the temperature.

V = 0.025 L, T = 22.5 +273 = 295.5 K, P = 225.2 mmHg

n = (225.2 × 0.025)/(295.5 × 0.0821 )

  = 0.232 moles

The correct answer is - False.

The soils are part of most of the major cycles that take place on the Earth, mainly because they are in touch with the other spheres. The carbon dioxide, as well as the nitrogen and the sulfur cycles too, end up in the soil in more cases than not during their cycles. While some are formed in it and than released, like the sulfur, the carbon mostly gets in it though the roots of the plants, as well as the decomposing organisms, and the nitrogen ends up in the soil with the water.

The soil is one of the most important pieces in the cycles of most of the gases on Earth, and without it, some will not even be possible.

Givens

m = 2.26 g

c = 4.19 J/(g * oC)

Δt = 23.5oC - 0 = 23.5oC

hf = heat of fusion for ice = 334 J/g

Equation

H = m*c*Δt +  hf * m

H = m*(c*Δt + hf)

Solution

H = 2.26 * (4.19 * 23.5  + 334)

H = 2.26 * (432.5)

H = 977.4 J

The liquid water is being converted to ice and heat is being released by the system. To calculate the amount of heat released, use the formula Q = mc∆T. Given the mass of water and the specific heat capacity, you can calculate the heat released.

In this process, the liquid water is being converted to ice. The change in temperature from 23.5 ℃ to 0 ℃ indicates that heat is being released by the system. To calculate the amount of heat released, we can use the formula Q = mc∆T, where Q is the heat released, m is the mass of water, c is the specific heat capacity of water, and ∆T is the change in temperature. Given that the mass of water is 2.26 g and the specific heat capacity of water is 4.184 J/g ℃, we can calculate the heat released.

https://brainly.com/question/19520516

#SPJ3

The Sun's layer extending into space in the associated picture is most likely the Corona, defined by its high temperatures and visible halo during a solar eclipse.

The layer of the Sun that is depicted as extending into space in the picture above is most likely the Corona. This is the Sun's outermost layer and it extends millions of kilometers into space. The Corona is distinctive for its high temperatures (over 1 million Kelvin) and its white, halo-like appearance during a solar eclipse. It's important to note that the other layers - Radiative zone, Convective zone, and Photosphere, are located within the Sun and thereby not visible or extensible into space.

https://brainly.com/question/4132825

#SPJ6

Phosphorus tribromide

PBr₃ is a covalent compound consisting of phosphorus and three bromine atoms, named phosphorus tribromide. It is classified as covalent because both elements are nonmetals.

Naming PBr₃ involves understanding the types of bonds present and the rules for naming compounds:

Prefixes for Covalent Compounds: Since there's only one phosphorus atom, no prefix is needed for the phosphorus part. For bromine, the prefix "tri-" is used because there are three bromine atoms in PBr₃.

Putting it all together, the name for PBr₃ is phosphorus tribromide.

the answer is :

1)Earth’s position

3)tectonic activity

4)volcanic activity

5)solar energy

Answer:

it's the first,third,fourth,and the fifth.

Explanation:

First, find the molar mass of H2O. It may vary depending on your source. Use the source your teacher gave you.

I got 18.015 g/mol as the molar mass of water.

Then you basically do some math to figure out the amount of moles...

9.15 grams × (1 mole H2O)/(18.015 grams H2O) = .5079

There is approximately .51 moles present.

Final answer:

To find the number of moles in 9.15 grams of H2O, divide the mass by the molar mass of water, which is 18.015 g/mol, resulting in approximately 0.508 moles of water.

Explanation:

To calculate the number of moles in 9.15 grams of H2O, we use the molar mass of water as a conversion factor from mass to moles. The calculation for the molar mass of water (H2O) is as follows:

(1.0079 + 1.0079 + 15.999) = 18.015 g/mol

To convert from grams to moles, we divide the mass of the substance by its molar mass:

Number of moles = Mass of substance (in grams) / Molar mass (in g/mol)

In this case:

Number of moles = 9.15 g / 18.015 g/mol

Calculate the value to find the number of moles present in 9.15 grams of water:

Number of moles = 0.508 moles (approximately)

D. a jar of mixed nuts you can see them difference with mixed nuts but with the other options they are the same so you cant tell it apart

hope this helps:)sorry if it doesnt

The best example of a heterogeneous mixture among the provided options is D. A jar of mixed nuts, where the composition varies and is not uniform throughout. Hence option D.

A heterogeneous mixture is one in which the composition is not uniform throughout. This means that different parts of the mixture can have different compositions. One everyday example of a heterogeneous mixture is vegetable soup, where each spoonful may contain different types and amounts of vegetables.

If we examine the options provided:

A mug of hot cocoa is generally considered a homogeneous mixture because the cocoa solids are uniformly distributed throughout the liquid.

A glass of tap water is a single-phase system and often treated as a pure substance, particularly if it's filtered and free from particulates.

A gallon of milk may appear homogeneous, but under a microscope, we can see fat globules and proteins dispersed in the water, making it a colloidal mixture, which is sometimes considered heterogeneous.

A jar of mixed nuts is a classic example of a heterogeneous mixture because the ratio of different types of nuts can vary from one handful to another.

Therefore, the best example of a heterogeneous mixture among the options is a jar of mixed nuts, which is option D.

I am assuming you forgot to include the unit of molarity, M, at the end of 0.500.

Molarity's formula is M=moles solute/liters solution.

We are given molarity and liters so we can rearrange the equation to solve for moles solute. Therefore:

moles solute=molarity * liters solution

moles solute= 0.500M * 0.035L = 0.0175

Thus there are 0.0175 mols of H2SO4 in 0.035L of a 0.500M solution.

I'm not sure because I took chem. a long time ago, but I think 3.6 grams H2O

Hope this helps!!!

The amount of water present in the given number of moles is 3.603 g.

The given parameters;

The amount of water present in the given number of moles is calculated as follows;

mass = molar mass x number of moles

mass = 18.015 g/mol  x  0.2 mol

mass = 3.603 g

Thus, the amount of water present in the given number of moles is 3.603 g.

Learn more about molar mass and moles here: https://brainly.com/question/5610380