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Answer:

150 feet

Explanation:

Answer:

iodine

Explanation:

Answer:

When the ambulance is coming towardss you the waves are smushed together and sound higher pitched but then it passes you and when tracveling away the waves are scretched out so the whee whoo sounds lower and that is because of the doppler effect

Answer:

An atom with a neutral charge has an equal number of protons and electrons.

Explanation:

The three main subatomic particles in the atom are neutrons, protons and electrons.

Protons are positively charged particles, electrons are negatively charged particles while neutrons are not charged particles.

An atom is neutral if the number of protons and electrons are equal. This is the condition for neutrality in the atom.

The number of protons will be the same for all isotopes of Carbon.  Options A and C are correct.

What made an atom?

An atom is made up of central nucleons (positive protons and neutral neutrons) and surrounding negatively charged electrons.

In a neutral atom, the number of electrons and protons is the same because opposite charges neutralize each other.

The number of protons is the same in all isotopes of an element because changing the proton changes the identity of the element.

Therefore, the number of protons will be the same for all isotopes of Carbon.

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Answer:

The period number on the Periodic table tells you the total number of orbits that the atom will have. In other words, the period number indicates the number of energy levels (or energy orbit) of an atom. For example, 1st period indicates that these elements possess 1 energy shell (or energy orbit).

Explanation:

Explanation:

4.5×6.022×10²³

27.099×10²³

According to Avogadro's number, there are 27.10×10²³ atoms in  4.5 moles of Al.

Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.

It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .

According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.

Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number.As 1 mole =6.023×10²³ atoms , thus,4.5 moles =4.5×6.023×10²³ = 27.10×10²³  atoms.

Thus, there are 27.10×10²³ atoms in  4.5 moles of Al.

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Answer:

34752.6 Pa.

Explanation:

Applying,

P/T = P'/T'............... Equation 1

Where P = Initial Pressure, T = Initial Temperature, P' =  Final pressure, T' = Final temperature.

make P' the subject of the equation

P' = (PT'/T).............. Equation 2

From the question,

Given: P = 33.7 kPa = 33700 Pa, T = 98.4°C = (273+98.4) = 371.4 K, T' = (110+273) = 383 K

Substitute these values into equation 2

P' = (33700×383)/371.4

P' = 34752.6 Pa.

Answer:

Alkynes are saturated hydrocarbons

Explanation:

Alkynes are groups of hydrocarbons that have the general formula of {Cn H2n - 2}. They have a triple carbon to carbon bond (C≡C) in their structure. Ethyne (HC≡CH) is the first member of the alkyne series.

Alkynes like alkenes are unsaturated hydrocarbons because of their triple and double carbon bonds respectively. Unsaturated hydrocarbons do not have a complete hydrogen atom in their structural composition. Hence, the statement that "Alkynes are saturated hydrocarbons" is FALSE.

Answer:

3,2,3,4

Explanation:

try this answer, it's syits best to the question

Answer:

1. In 0.0250 moles of potassium chromate there are 0.05 moles of potassium , 0.025 moles of chromium and 0.1 moles of oxygen are present.

2. In 4.50 moles of ammonium carbonate there are 9 moles of ammonium ions and 4.5 moles of carbonate ions are present.

Explanation:

1.

Moles of potassium chromate = 0.0250 mol

Formula of potassium chromate = [tex]K_2CrO_4[/tex]

1 mole of potassium chromate has 2 moles of potassium , 1 mole of chromium and 4 moles of oxygen.

Then in 0.0250 moles of potassium chromate:

Moles of potassium will be:

[tex]2\times 0.0250 mol= 0.05 mol[/tex]

Moles of chromium will be:

[tex]1\times 0.0250 mol= 0.025 mol[/tex]

Moles of oxygen will be:

[tex]4\times 0.0250 mol= 0.1 mol[/tex]

2.

Moles of ammonium carbonate = 4.50 mol

Formula of ammonium carbonate =[tex](NH_4)_2CO_3[/tex]

1 mole of ammonium carbonate has 2 moles of ammonium ion and 1  mole of carbonate ion.

Then in 4.50 moles of ammonium carbonate:

Moles of ammonium ion will be:

[tex]2\times 4.50 mol= 9mol[/tex]

Moles of carbonate ions will be:

[tex]1\times 4.50 mol= 4.5 mol[/tex]

Answer: What is the mass of disulfur pentoxide (S2O5)?

Explanation:144.14g/mol

Answer:

338.38 K

Explanation:

Applying,

PV = nRT............... Equation 1

Where P = pressure, V = Volume, R = Temperature, n = number of moles, T = temperature.

Make T the subject of the equation,

T = PV/nR............. Equation 2

From the question,

Given: P = 1.95 atm, V = 12.3 L, n = 0.854 moles

Constant: R = 0.083 L.atm/K.mol

Substitute these values into equation 2

T = (1.95×12.3)/(0.854×0.083)

T = 338.38 K

Answer:

If a substance can be dissolved it is called soluble.

if a substance cannot be dissolved it is called insoluble

Answer: Electrovalent bonds are produced when electrons are transferred from atoms of one element to atoms of another element, producing positive and negative ions. The bond which is formed by the transfer of electrons between the atoms is called electrovalent bond or ionic bond. Electrovalent bonds are only formed between metals and non-metals. Electrovalent bonds are not formed between two non-metals.

In simple words electrovalent bond involves the transference of a certain number of electrons to another dissimilar atom which has a tendency to gain electrons so that both acquire stable inert gas configurations. The electrostatic attraction always tends to decrease the potential energy. Hence, the potential energy of the system is much less than it was before the formation of an ionic bond.

Explanation: An Ionic bond is the bond formed by the complete transfer of valence electron to attain stability.

This type of bonding leads to the formation of two oppositely charged ions – positive ion known as cations and negative ions are known as anions.

The presence of two oppositely charged ions results in a strong attractive force between them. This force is an ionic or electrovalent bond.

Ionic bonds form between atoms with large differences in electronegativity, whereas covalent bonds formed between atoms with smaller differences in electronegativity.

The compound formed by the electrostatic attraction of positive and negative ions is called an ionic compound.

Answer:

C Condensation of water vapor

Explanation:

One of the components of the atmosphere is water vapour. Water vapour is always present in air.

This water vapour may combine with particles of dust and smoke and condense around them to form clouds.

As more water vapour condenses and coalesces, the clouds become thicker and precipitation eventually follows.

Answer:

Reflection involves a change in direction of waves when they bounce off a barrier; refraction of waves involves a change in the direction of waves as they pass from one medium to another; and diffraction involves a change in direction of waves as they pass through an opening or around a barrier in their path.

Explanation:

https://www.physicsclassroom.com/class/waves/Lesson-3/Reflection,-Refraction,-and-Diffraction#:~:text=Diffraction%20of%20Waves-,Reflection%20involves%20a%20change%20in%20direction%20of%20waves%20when%20they,a%20barrier%20in%20their%20path.

Reflection of sound wave differs from diffraction of sound wave in that a reflected sound wave bounces back to the place of origin while a diffracted sound wave changes direction as it passes through an opening.

Reflection is the bouncing back of a wave when it hits an obstacle along its path.

Diffraction is the spreading out of a wave in a circular path as it passes through a tiny opening.

Therefore, the difference between reflection and diffraction is that a reflected sound wave bounces back to the place of origin while a diffracted sound wave changes direction as it passes through an opening.

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Answer:

I think it's

there are the same number of molecules on each side of the equation, then a change of pressure makes no difference to the position of equilibrium

Na2SO3 – Sodium sulfite

Answer: (A) a cobalt atom contains 27 protons, and most cobalt atoms contain 32 neutrons.

Explanation: just answered the question and that was the correct answer

Answer:     The answer is :     A cobalt atom contains 27 protons and MOST  neutral cobalt atoms contain 32 electrons

Explanation:   I took the test

There is an increase in temperature when the rate of chemical reactions increases.

The chemical reaction is the process in which the two or more substances where the reactions are converted into one or more different substances. These may be either chemical elements or compounds.

The chemical reaction rearranges the atoms of the reactants to create the different substances of the product. The speed of the reaction depends on the rate of temperature and as well reactant itself.

Find out more information about the chemical reactions.

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Answer:

It increases when a catalyst is added.

Explanation:

"A catalyst is a substance that can be added to a reaction to increase the reaction rate without getting consumed in the process. Catalysts typically speed up a reaction by reducing the activation energy or changing the reaction mechanism." (Khan Academy)

Answer:

they are all planets

Explanation:

Answer: The new volume is 95.45 mL.

Explanation:

Given: [tex]V_{1}[/tex] = 45.0 mL,         [tex]P_{1}[/tex] = 0.98 atm

[tex]P_{2}[/tex] = 2.1 atm,               [tex]V_{2}[/tex] = ?

According to Boyle's law, at constant temperature the pressure of a gas is inversely proportional to its volume.

Therefore, formula used to calculate the new volume is as follows.

[tex]\frac{P_{1}}{V_{1}} = \frac{P_{2}}{V_{2}}[/tex]

Substitute the values into above formula as follows.

[tex]\frac{P_{1}}{V_{1}} = \frac{P_{2}}{V_{2}}\\\frac{0.98 atm}{45.0 mL} = \frac{2.1 atm}{V_{2}}\\V_{2} = 95.45 mL[/tex]

Thus, we can conclude that the new volume is 95.45 mL.

Answer:

Solids, liquids, and gases, exist in the human body. The body is mostly made up of liquid because the human body is 60% water. You would most likely be able to find solids (bones), liquids (blood, stomach acid) and gases (oxygen in your lungs or air in your digestive tract).

Explanation:

Answer:

there are 106 particles

Answer:

20 electrons

A neutral atom with atomic number 20 will have 20 electrons.

The atomic number is, by definiton, the number of protons in an atom's nucleus but for a neutral atom it's also equal to the number of electrons. Each element has a different, unique number of protons that determines its identity.

Explanation:

Answer:

B. 460 NM

Explanation:

THAT THE ANSWER