Can someone please help me with my chemistry hw

Stoichiometry is the field of chemistry that is concerned with the relative quantities of reactants and products in chemical reactions. For example, when oxygen and hydrogen react to produce water, one mole of oxygen reacts with two moles of hydrogen to produce two moles of water

Answer:

the relationship between the relative quantities of substances taking part in a reaction or forming a compound, typically a ratio of whole integers.

Explanation:

Dont put so much points pal,

Answer:

MgCl2

Explanation:

because of the salt containing Cl

Answer:

option D

Explanation:

first quantum number of a 2s2

n = 2

second quantum number of a 2s2

l = 0 to n-1

l = 0, 1

For s orbital

l = 0

third quantum number of a 2s2

ml = - l to +l

ml = 0

fourth quantum number of a 2s2 electron be

?½ = spin down

½ = spin up

2s2 has 2 electrons 1 spin down and 1 spin up (starts with spin down)

ms = +1/2

Answer:

+1/2

Explanation:

The balanced equation of the given reaction is as follows: 5SiO2 + 2CaC2 → 5Si + 2CaO + 4CO2.

A chemical equation is said to be balanced when the number of atoms of each element on both sides of the equation is the same.

According to this question, a chemical reaction between quartz and calcium chloride is given to produce silicon, calcium oxide and carbon dioxide.

The balanced equation that represents an equal number of atoms on both sides is as follows:

5SiO2 + 2CaC2 → 5Si + 2CaO + 4CO2

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The cheese having a higher thermal conductivity conducts heat better so it can deliver the heat to your mouth more quickly while the pizza crust transmits heat more slowly. So, even if they were the same temperature, the cheese would more likely give your tongue/mouth a severe burn.

Answer:C) the Catskills

Explanation:

Answer:b

Explanation:

The function of the outer covering of a plant is to help reduce water loss, option B. The outer covering of a plant is known as the epidermis, and it serves as a protective layer that helps to prevent excessive water loss through transpiration.

The epidermis may  contain specialized structures such as stomata and trichomes, which further regulate water loss and protect the plant from environmental stresses such as insect predation and UV radiation.

Option A, "A plant's outer covering is involved in reproduction," is incorrect because the reproductive structures of plants are typically located within the plant's interior, not on the outer surface.

Option C, "A plant's outer covering is for preying on other plants," is incorrect because plants are not capable of actively preying on other plants.

Option D, "A plant does not have an outer covering," is incorrect because all plants have an outer covering in the form of the epidermis or a similar structure.

Hence, option B is correct.

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Answer:

exoplanet: a planet that orbits a star outside the solar system.

pulsar: a celestial source of pulsating electromagnetic radiation (such as radio waves)

Explanation:

exoplanet: a planet that orbits a star outside the solar system.

pulsar: a celestial source of pulsating electromagnetic radiation (such as radio waves)

Answer: C HNO3 and NaOh

Explanation:

Answer:

It would be B they bend to reflect light

Answer:

the first one

Explanation:

I take this subject

Answer:

yes

Explanation:

bc god exist

Answer:

3200

Explanation:

Explanation:

Concentration question....

0.965L x (0.0575 mol MgSO4 / 1L) x (120.4g MgSO4 / 1 mol MgSO4) = 6.68g MgSO4

The concept molarity is used here to determine the grams of magnesium sulfate dissolved in 0.965 L of a 0.0575 M solution. The mass of magnesium sulfate in grams is 6.68 g.

The molarity of a solution is defined as the number of moles of the solute present per litre of the solution. It is generally represented by the unit mol/L. The equation used to calculate the molarity is:

Molarity = Number of moles of the solute / Volume of the solution in litres

The molar mass of MgSO₄ = 120.36 g/mol

We have 0.0575 M solution.

That is 0.0575 mol/L × 120.36 g/mol = 6.9207 g/L

Here we want mass in 0.965 L. So the mass is:

Mass = 0.965 L × 6.9207 g/L = 6.68 g

Thus the mass in grams of magnesium sulfate is 6.68 g.

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Answer:

35750.4 Joules

Explanation:

Using the formula as follows;

Q = m × c × ∆T

Where;

Q = amount of heat (joules)

m = mass of substance (g)

c = specific heat capacity (J/g°C)

∆T = change in temperature (°C)

According to the provided information,

mass (m) = 320.0 grams

c = 4.2 J/g°C

∆T = (50.8°C - 24.2°C) = 26.6°C

Q = ?

Using; Q = m × c × ∆T

Q = 320 × 4.2 × 26.6

Q = 35750.4 J

Answer: the answer is “C”

Explanation:

Took the T E S T

Answer:

convection

Explanation:

Convection is a mode of heat transfer in which the particles of a substance actually move from place to place.

During convection, warmer and less dense air rises while colder and denser air sinks downwards under gravity.

Hence; when hot air balloon rises because the fire warms up the air and the air circulates to fill the balloon and lift it at the same time, convection has taken place.

Answer: [tex]2Bi(NO_3)_5(aq)+5Sr(OH)_2(aq)\rightarrow 2Bi(OH)_5(s)+5Sr(NO_3)_2(aq)[/tex]

Explanation:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.  

A double displacement reaction in which one of the product is formed as a solid is called as precipitation reaction.  

The balanced chemical equation is:

[tex]2Bi(NO_3)_5(aq)+5Sr(OH)_2(aq)\rightarrow 2Bi(OH)_5(s)+5Sr(NO_3)_2(aq)[/tex]

Answer: 7.81 mol HgO (How many moles of mercury(II) oxide, HgO, are needed to produce 125 g of oxygen, O2?)

Explanation:

12.9 grams of Cl are in a 38.0-g sample of the chlorofluorocarbon C2F3Cl3.

Chlorofluorocarbon is defined as a gas that was previously widely employed in many items (like aerosols), but is thought to harm the ozone layer in the Earth's atmosphere. Halogen exchange using chlorinated methane's and ethane's as the starting point often produces CFCs and HCFCs. The chlorofluorocarbons undergo free-radical reactions to produce the brominated derivatives, which replace C-H bonds with C-Br bonds.

1 Carbon + 3 Fluorine + 1 Chlorine = CF3Cl

1 × (12.011 g/mol) plus 3 x (18.988 g/mol) + [1 x 35.453 g/mol] 104.428 grams per mole

1 mole per 104.428 grams of 38.0 grams equals 0.364 moles. 0.364% CF3Cl moles 1 mole of Cl and 1 mole of CFCl3 in CF3Cl equals 0.364 moles of Cl.

Chlorine weighs 35.453 grams per mole, so 12.9 grams of chlorine are contained in every 38.0 grams of CF3Cl.

Thus, 12.9 grams of Cl are in a 38.0-g sample of the chlorofluorocarbon C2F3Cl3.

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Answer:

27.22 dm³

Explanation:

Given parameters:

number of moles = 1 mole

temperature= 50°C, in K gives 50+ 273 = 323K

Pressure= 98.6kpa in ATM, gives 0.973 ATM

Solution:

Since the unknown is the volume of gas, applying the ideal gas law will be appropriate in solving this problem.

The ideal gas law is mathematically expressed as,

Pv=nRT

where P is the pressure of the gas

V is the volume

n is the number of moles

R is the gas constant

T is the temperature

Input the parameters and solve for V,

0.973 x V = 1 x 0.082 x 323

V= 27.22 dm³

Answer:rust

Explanation:

Answer:

they are all in parts of our life and we need them each for surviving.

Explanation:

Answer:

B

Explanation:

1 mole is equal to 58.31968 grams.

so 3.5 moles equal to answer choice B

Answer:

Explanation:

Both points on a wave oscillate in directions that are perpendicular to the wave's advanced path, resulting in a transverse wave motion. Sea surface ripples, seismic S (secondary) waves, and electromagnetic (e.g., radio and light) waves are examples of transverse waves.

Their frequency and amplitude are related to the amount of energy they bear. The more energy, the higher the frequency, and the more energy, the higher the amplitude. With the activity Investigating waves and electricity, you will create these patterns on your own.

Particles in the medium vibrate to and from in a direction perpendicular to the direction of energy transport in transverse waves.

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Answer: I think it is ‘Genetically diverse’

Explanation:

Answer:

Why does a car rust from road salt? Metal parts of a car come in contact with precipitation water containing carbon dioxide and oxygen. Road salt contains free-radical ions and they come into contact with the precipitation water. After extended exposure to oxygen, iron oxide forms, which speeds up the rusting process.

Explanation:

Answer:

I think it is A.Element maybe

Answer:

the answer is a because thermal energy is heat and the question said that is not a factor of thermal energy so A does not refer to heat