Ill give you guys brainly and 50 points please answer im struggling

Answer:

Option B

Explanation:

In order to find the answer to this question you need to move the decimal point as many times as the exponent, positive exponent to the right and negative exponent to the left. In this case we have all positive exponents meaning we move all of them to the right but they all equal the same thing. The most logical answer to this question is option B "10.07×10^4" because the equation is balanced.

Hope this helps.

Answer:

SO₄²⁻ (aq) + Pb²⁺ (aq) → PbSO₄ (s)

General Formulas and Concepts:

Explanation:

Step 1: RxN

Na₂SO₄ (aq) + Pb(NO₃)₂ (aq) → PbSO₄ (s) + NaNO₃ (aq)

Step 2: Balance RxN

Na₂SO₄ (aq) + Pb(NO₃)₂ (aq) → PbSO₄ (s) + 2NaNO₃ (aq)

Step 3: Ionic Equations

Total Ionic Equation:

2Na⁺ (aq) + SO₄²⁻ (aq) + Pb²⁺ (aq) + 2NO₃⁻ → PbSO₄ (s) + 2Na⁺ (aq) + 2NO₃⁻ (aq)

Cancel out spectator ions.

Net Ionic Equation:

SO₄²⁻ (aq) + Pb²⁺ (aq) → PbSO₄ (s)

Answer:

2H⁺ (aq) + 2OH⁻ (aq) → 2H₂O (l)

General Formulas and Concepts:

Explanation:

Step 1: RxN

HNO₃ (aq) + Ca(OH)₂ (aq) → Ca(NO₃)₂ (aq) + H₂O (l)

Step 2: Balance RxN

2HNO₃ (aq) + Ca(OH)₂ (aq) → Ca(NO₃)₂ (aq) + 2H₂O (l)

Step 3: Ionic Equations

Total Ionic Equation:

2H⁺ (aq) + 2NO₃⁻ (aq) + Ca²⁺ (aq) + 2OH⁻ (aq) → Ca²⁺ (aq) + 2NO₃⁻ (aq) + 2H₂O (l)

Cancel out spectator ions.

Net Ionic Equation:

2H⁺ (aq) + 2OH⁻ (aq) → 2H₂O (l)

Answer:

C. Only 2s and 2p may hybridize; these orbitals contain valence electrons used in bonding.

Explanation:

Carbon has four valence electrons (2s² 2p²), in several organic compounds it forms four bonds and as this element has two types of orbitals to join, 2s and 2p, it is expected that a compound like methane has two types of C-H bonds, but this is not the case, as all its orbital atoms are the same.

In a process called hybridization, s orbitals and p orbitals are combined in an atom. Depending on the amount of p orbitals that are combined, the hybrid orbitals can be sp (one orbital 2s and one 2p are combined), sp² (the 2s orbital combines with two 2p orbitals) and sp³(the orbital 2s combines with three 2p orbitals).

The carbon atom has the presence of 6 electrons. The valence bond theory hybridized the 2s and 2p orbital for the bonding, as they have valence bonds.

The valence bond theory has been the atomic hybridization of the atoms that results in the formation of the bonds.

The carbon atom has 4 valence electrons present in the bonding valence orbitals. The orbitals combine as sp, sp2, sp3 orbital in order to form the bond.

Thus, since there has been the presence of valence electrons in the s and p orbitals, the 2s and 2p are involved in the hybridization. Hence, option C is correct.

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Answer:

Mass of sodium chloride decomposed = 24.54 g

Explanation:

Given data:

Mass of sodium chloride decomposed = ?

Mass of chlorine gas formed = 15 g

Solution:

Chemical equation:

2NaCl      →         2Na + Cl₂

Number of moles of Cl₂:

Number of moles = mass/molar mass

Number of moles = 15 g/ 71 g/mol

Number of moles = 0.21 mol

Now we will compare the moles of Cl₂ with NaCl from balance chemical equation.

                    Cl₂            :              NaCl

                      1              :                2

                      0.21         :            2×0.21 = 0.42 mol

Mass of Sodium chloride decompose:

Mass = number of moles × molar mass

Mass = 0.42 mol × 58.44 g/mol

Mass = 24.54 g

Answer:

Increasing the speed of the particles

Explanation:

The energy absorbed in the phase B is used to increase the speed of the particles.

We can see a positive slope which shows that the temperature is increasing considerably with increasing time.

At this phase the reaction rate is become faster as the temperature change has a considerable effect on reaction rates.

Temperature is directly proportional to the average kinetic energy of reacting particles.

Answer:

Universe.

Explanation:

Biosphere is just a planet. Solar system contains planets and star. Galaxy holds multiple solar systems only. Universe hold everything, biospheres, solar systems, and galaxies. I hope this helps :D

Answer:

B.

Explanation:

A solar system is IN a galaxy. Its not A.

A Galaxy doesnt have other galaxies in it. Its not c

A biosphere is only referring to earth. its not D.

Therefore, it is B. A universe is everything in outer space including stars, planets, and galaxies.

Answer:

20atm

Explanation:

according to boyles law P1V1= P2V2

Answer:

The climate was wet and cold

Explanation:

Answer:

The large tree rings allow you to conclude that the climate was either very warm or wet during those growing seasons, because greater than normal growth occurred.

Explanation: It is the edge sample response

Answer:

The four main categories of mineral formation are: (1) igneous, or magmatic, in which minerals crystallize from a melt, (2) sedimentary, in which minerals are the result of sedimentation, a process whose raw materials are particles from other rocks that have undergone weathering or erosion, (3) metamorphic, in which new minerals form at the expense of earlier ones owing to the effects of changing—usually increasing—temperature or pressure or both on some existing rock type, and (4) hydrothermal, in which minerals are chemically precipitated from hot solutions within Earth.

The mineral can be formed from volcanic gases, oxidation, crystallization from magma, sediment formation, or deposition from a saline fluid.

A rock can be described as a collection of minerals. A rock that becomes so hot it melts and many minerals come out in liquids that are hot enough to melt rocks.

Magma can be defined as a melted rock inside Earth, a molten mixture of substances that can be hot to more than 1,000°C. When the magma cools slowly inside the earth, which provides mineral crystals time to grow large enough.

Granite is a rock that produces from slowly cooled magma, consisting of the minerals quartz, plagioclase feldspar which is shiny white, pink potassium feldspar, and black biotite.

When magma will erupt onto the surface of the Earth, it is known as lava. Lava cools more rapidly than magma when it is below the surface and mineral crystals do not have time to form. But the chemical composition remains the same as if the magma cooled slowly.

The mineral can be formed through hydrothermal processes, weathering, and metamorphic and igneous environments.

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Answer:

F

General Formulas and Concepts:

Explanation:

The trend for 1st I.E increases to the right and up. Therefore, the top right corner of the Periodic Table would have the highest 1st I.E.

Oxygen and Fluorine are in Period 2 while Sulfur and Chlorine are in Period 3. We then know that Oxygen and Fluorine will have higher I.E's than Sulfur and Chlorine.

Oxygen is in Group 16 while Fluorine is in Group 17. Since Fluorine is farther to the right of the Periodic Table, it will have the highest I.E out of all 4 elements.

The reason why F has a larger I.E than O is because F has a larger Zeff. Since Fluorine has more protons in the nucleus than O, the FOA between the nucleus and the e⁻ are greater than those of O. Therefore, it takes more energy to remove an e⁻ from F than O.

The reason why F has a larger I.E than S and Cl is because S and Cl have more shielding effect than F. Since S and Cl has more core e⁻, it weakens the FOA between the nucleus and the outermost shell e⁻, thus making it easier to remove. F has less core e⁻ and therefore there is less of a shielding effect and thus the FOA is larger and requires more energy to remove.

Answer:

150ml

Explanation:

For this question,

NaOH completely dissociates. It is a strong base

HCl also completely dissociates. It is a strong acid

So we have this equation

m1v1 = m2v2 ----> equation 1

M2 = 2m

V1= ??

M2 = 6m

V2 = 50m

When we input these into equation 1, we have:

2m x v1 = 6m x 50ml

V1 = 6m x 50ml/2

V1 = 300/2

V1 = 150ml

Therefore NaOH that is required to neutralize the solution of hydrochloric acid is 150ml.

Thank you

Answer:

idek akxkkwskkd nwkdkekekd

Answer:

Oxygen receives two electrons from magnesium

Explanation:

Answer:

iron i believe is ionic and carbon is covalent

Explanation:

if im wrong correct me

Answer:

D. gravity

hope this helps

Answer:

The balanced equation is 2H2 + O2 –> 2 H2O. It takes two hydrogen atoms for every oxygen atom to produce this reaction, so the mole ratio between hydrogen and oxygen is 2:1.

Answer:

2:1

Explanation:

I forgot the explanation of this, but I remembered the answer

Answer:

True

Explanation:

Suspensions are referred to as mixtures composed of materials which are visible to the naked eyes . They are usually insoluble in the solvent .

The mixtures which are composed of materials and at the same time non visible to the naked eyes due to their very tiny size are referred to as colloids or colloidal particles in the field of science.

answer: its 7290 joules.

explanations: the first procedure is to convert 1 pound to kilogram. 1 kg = 2.205 hence given 100 lb so we cross multiply. 1 kg * 100 = 2.205 * x

hence x= 45 kg. let's convert 1 mile per hour = 0.45 metre per second we cross multiply by 40 mile per hour. x= 40 * 0.45= 18 m/s.

KE= 1/2 * 45 * (18)^2

= 1/2 * 45 * 14580

= 7290joules

Explanation:

Hydrogen bond is a type of intermolecular chemical bond formed between two molecules. It is classified as a special dipole-dipole attraction between polar molecules in which a hydrogen atoms is directly joined to a highly electronegative atom.

The proportion of the electronegativity of an atom that is directly hydrogen bonded to the hydrogen determines how strong the connection will be. This statement is true about hydrogen bonds.

An intermolecular chemical interaction known as a hydrogen bond is created when two molecules come together. When a hydrogen atom is linked directly to an atom that has a strong electronegative potential, it is categorised as a specific case of dipole-dipole attraction among polar molecules.

A hydrogen bond is essentially an electrostatic attraction among a neighbouring molecule's O, N, or F atom and its hydrogen atom, which is the nucleus of one of the molecules.

The proportion of the electronegativity of an atom that is directly bonded to the hydrogen determines how strong the connection will be.

Compounds like water and ammonia have physical characteristics that are influenced by hydrogen bonding forces.

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Answer:

B

Explanation:

a mole is "a chemist's dozen" lol

Answer:

2-5

Explanation:

I just did it.

The oxidation numbers of the atoms in this reaction are 0 for Mg(s) and H in H₂, -1 for Cl in HCl, +1 for H in HCl and +2 for Mg in MgCl₂

An oxidation number is a number assigned to atoms in molecules to show the general distribution of the electrons.

Oxidation state or number helps us describe the transfer of electrons.

The oxidation number/state is also used to determine the changes that occur in redox reactions.

Overall, the oxidation number of an atom in a molecule is the charge that the atom would have if all polar covalent and ionic bonds resulted in a complete transfer of electrons from the less electronegative atom to the more electronegative one.

Therefore, The oxidation numbers of the atoms in this reaction are 0 for Mg(s) and H in H₂, -1 for Cl in HCl, +1 for H in HCl and +2 for Mg in MgCl₂

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Explanation:

A stethoscope is used to listen to sounds that the heart , lungs , blood flow , intestines make.

Answer:

20,075 g

Explanation:

Solution at attachment box

Firstly i found the mole of HCLwhich we needed

After that I found the gram of HCL which we needed

M.V=n

The mass of hydrogen chloride present in 50. mL of 11 M HCl solution is 20.08g. Details about mass can be found below.

The mass of a substance can be calculated by multiplying the number of moles of the substance by its molar mass.

However, the number of moles of Hydrogen chloride must be calculated first as follows:

Molarity = no of moles/volume

no of moles = 11M × 0.05L

no of moles = 0.55mol

mass of HCl = 0.55 mol × 36.5g/mol

mass of HCl = 20.08g

Therefore, the mass of hydrogen chloride present in 50. mL of 11 M HCl solution is 20.08g.

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Rate of Sulfur dioxide : 2730.44 mL/s

Graham's law: the rate of effusion of a gas is inversely proportional to the square root of its molar masses or  

the effusion rates of two gases = the square root of the inverse of their molar masses:  

[tex]\rm \dfrac{r_1}{r_2}=\sqrt{\dfrac{M_2}{M_1} }[/tex]

or  

[tex]\rm M_1\times r_1^2=M_2\times r_2^2[/tex]

MW of N₂ = 28 g/mol

MW SO₂ = 64 g/mol

[tex]\tt 28\times 79^2=64\times r_2^2\\\\r_2^2=\dfrac{28\times 79^2}{64}=2730.44~mL/s[/tex]

Answer:

Na2HPO4

Explanation:

The chemical formula for Copper I Monohydrogen Phosphate is CuHPO₄.

Let's break down the formula to understand it better:

1. "Cu" represents copper, which is an element with the atomic symbol Cu. Copper is a transition metal that is commonly used in electrical wiring and plumbing.

2. "H" represents hydrogen, which is an element with the atomic symbol H. Hydrogen is the lightest and most abundant element in the universe.

3. "PO₄" represents the phosphate ion, which is composed of one phosphorus atom (P) and four oxygen atoms (O). The phosphate ion is commonly found in biological systems and is an essential component of DNA, RNA, and ATP.

So, when  combined one copper atom (Cu), one hydrogen atom (H), and one phosphate ion (PO₄),  get the formula CuHPO4, which represents Copper I Monohydrogen Phosphate.

It's important to note that the "I" in Copper I refers to the charge of the copper ion in this compound. Copper can form different ions with different charges, and the Roman numeral indicates the charge of the copper ion in this particular compound.

Thus,  chemical formula for Copper I Monohydrogen Phosphate is CuHPO₄.

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Answer: C

Explanation:

I took a quiz on this.

Answer:

The new material Emily invented allows scratches to be repaired quickly, so it would be useful on cars and other surfaces that experience a lot of wear.

Explanation:

I got this right on Plato\Edmentum

Answer:

The new material Emily invented allows scratches to be repaired quickly, so it would be useful on cars and other surfaces that experience a lot of wear.

Explanation: