Need answers to all these questions asap

Answer:

A ithink

Explanation:

The chemical changes require the breaking and forming of chemical bonds during a chemical reaction. The correct option is C.

Chemical Bonding refers to the formation of a chemical bond between two or more atoms, molecules, or ions to give rise to a chemical compound.

These chemical bonds are what hold the atoms in the resulting compound together.

A chemical bond is a bond formed when the atoms in a compound's molecule combine and are held together by a strong combining force.

Chemical bonds are classified into two types namely ionic bonds and covalent bonds.

Chemical bonding enables scientists to combine the elements of the periodic table in a variety of ways to create chemical compounds and materials.

Thus, the correct option is C.

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Answer: a) 35 , b) 45 , c) 35 , d) 35 , e) 80

Explanation:

a) - protons equal to atomic number of element , b) - subtract atomic number by number of protons to get neutrons (80 - 35 = 45) , c) - protons same as electrons unless its an ion , d) - atomic number is equal to protons , e) - protons plus neutrons equal mass number (35 + 45 = 80). :)

1. Sara wants to see if a new brand of hair dye lasts longer than the brand she

currently uses. She puts the new hair dye on the left side of her head and the old

brand on her right side. After 2 weeks she observes which side of her head has

more gray hair showing through.

Answer:

Earth

Explanation:

Answer:

4Fe + 3O₂ → 2Fe₂O₃

General Formulas and Concepts:

Chemistry - Reactions

Explanation:

Step 1: Define

RxN:   Fe + O₂ → Fe₂O₃

Step 2: Balance

We need to balance both Fe and O.

LCM of 2 and 3 is 6:

Fe + 3O₂ → 2Fe₂O₃

We now need the same amount of Fe on both sides:

4Fe + 3O₂ → 2Fe₂O₃

Answer:

its d

hope it helpss :)))

Answer: D

Explanation:

Answer:

Its answer choice C

Answer:

D. Radiation

Explanation:

The Sun always transfers its energy to any planet (Including Earth) through solar radiation, infrared, and UV rays. These are all examples of radiation.

I hope this helps you! Good luck with your test/assignment! :D

Answer:

C option

Explanation:

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Answer:

By the wavelength of the light transmitted by it.

Explanation:

The color of a transparent object is determined by the wavelength of the light transmitted by it. An opaque object that reflects all wavelengths appears white; one that absorbs all wavelengths appears black.

Answer:

[Ar]4s23d3

Explanation:

Answer:

Does a magnet attract the element?

Explanation:

This is because, the attraction of an element by a magnet is a purely physical property. It has to do with the orientation of the electrons in the element. It does not tell us of the composition of the element or how it reacts with other elements. Whereas, the other questions deal with the chemical properties of the element. That is, how it reacts with other elements or substances.

Answer:

Thank you! Thank you! Thank youuuuuu

Explanation:

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The bottom layer will be the ether layer

a mixture in which the solute dissolves until it is no longer able to do so, leaving the undissolved components at the bottom. Solution without saturation. a solution that totally dissolves and leaves nothing behind (but has less solute than the saturated solution) A saturated solution is one that has as much of the solute present as is capable of dissolving. A solution is said to be unsaturated if it doesn't contain all of the solute that can dissolve in it. A saturated solution is one that has as much solute in it as can be dissolved under the circumstances under which it is present.

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Answer:

Cl-

Explanation:

When chlorine reacts with other substances, it usually forms the chloride ion (Cl-). This is because it has seven valence electrons, and in order to gain a full octet, it has to gain one electron (which has a negative charge). For example, when it reacts with Sodium (Na), the product is table salt (NaCl) because chlorine takes one electron from sodium and becomes Cl-. Sodium also becomes Na+, because it loses one electron.

Answer:

A option

Explanation:

water gets split in photosynthesis

Answer:

The movement of tectonic plates is caused by convection currents in the molten rock in Earth's mantle below the crust layer. Earthquakes and volcanoes are great examples of the tectonic movement's results.

Explanation:

Answer:

Declare a variable populationChange, suitable for holding numbers like -593142 and 8930522.

int populationChange

Answer:

A.

Explanation:

I'm pretty sure that its right because I know bases aren't soluble and I've never heard anything about all of them being neutralizing to acids.

Hope this helps!

Answer:

You have 3 moles, so there are 18481.518 oxygen molecules

Explanation:

There are  18.066×10²³ molecules of oxygen present  in 3 moles of oxygen.

Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons.

Molar mass has units of gram per mole . In case of molecules, where molar mass  in grams present in one mole  of atoms is its atomic mass.

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Answer:

Ring is made up off copper.

Explanation:

Given data:

Mass of ring = 89.2 g

Volume of water = 10 mL

Volume of water + ring = 20 mL

Ring is made up of = ?

Solution:

Volume of ring = (Volume of water + ring) - Volume of water

Volume of ring = 20 mL - 10 mL

Volume of ring = 10 mL

Density:

Density = mass/volume     ( 1 mL = 1 cm³)

d = 89.2 g/  10cm³

d = 8.92 g/cm³

Thus, ring is made up off copper.

Answer:

The third option should be right

Answer:

C.

Explanation:

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Answer:

The elements in the alkaline earth metals group; beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra), have two electrons in their outer electronic shell.

Explanation:

The alkaline earth metals consisted of 5 shells have been beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).

The alkali earth metal has been the element of group 2. The elements have consisted of the 2 valence electrons.

The electrons in the elements have been assigned the electron address based on the capacity of the shells to occupy electrons.

The electrons have been filled based on the energy level of the shells.

The order of the increasing energy level has been:

1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s.

The elements with the occupied 4p shells will have the 5 shells.

The elements in group 2 consisted of 5 shells have been beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).

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The atom probably has 8 neutrons in the nucleus.

Atomic number (Z) is total number of protons and mass number (A) is total number of protons and neutrons in a nucleus.

N(p⁺) = Z = 7; number of protons in the atom

A = N(p⁺) + N(n°)

N(n°) =  A -  N(p⁺)

N(n°) = 15 - 7

N(n°) = 8; number of neutrons in the atom

N(e-) = N(p⁺) = 7; number of electrons in the atom

Neutron (symbol: n°) is a subatomic particle with no net electric charge.

Protons and neutrons are found in nucleus of an atom (atomic nuclei).  

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The condensation reaction between two molecules of glucose would result in the formation of maltose (C12H22O11) and the release of water.

Carbohydrates are organic compounds that are used to store energy. An example of a carbohydrate is glucose, which is a single sugar or a monosaccharide. The process of forming larger molecules from the combination of simple sugars is called the condensation process. A water molecule is released in the process of combining the molecules together through a glycosidic bond.

The condensation reaction for two molecules of glucose (C6H12O6) results in the formation of maltose, a disaccharide, and the release of water. The molecular formula of maltose is C12H22O11. It can be observed that the condensation reaction shown below is balanced.

Glucose (C6H12O6) + Glucose (C6H12O6)  → Maltose (C12H22O11) +H2O

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Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question we have

[tex]denstity = \frac{100}{10} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

thanks

Explanation:

Answer:

True

Explanation: