PLEASE HELP, will mark brainlest
What is the missing element from the following equation
A
B
С
D
E

Answer:

Explanation:

A molecule is a basic unit of a chemical substance made up of two or more atoms that are bonded together. A compound, on the other hand, is a substance made up of two or more different elements that are chemically bonded together.

Every compound is a molecule because it is made up of at least two chemically bonded atoms, but not every molecule is a compound because a molecule can be made up of the same type of atoms and not be a compound.

For example, molecular oxygen (O2) is made up of two oxygen atoms, but it is not a compound because both atoms are the same element. On the other hand, water (H2O) is a compound made up of hydrogen and oxygen atoms.

A Brainly star would be appreciated if it helped you!

The acid-conjugate base pair of the above reaction is HI and I (option D).

A conjugate base is any compound, of general formula Xn+, which can be transformed into a conjugate acid by the gain of a proton.

In other words, a conjugate base is a base with a hydrogen ion added to it, as in the reverse reaction it loses a hydrogen ion.

The conjugate base is formed from the acid by losing a proton (H+).

Therefore, the acid and conjugate base pair is represented by option D.

Learn more about conjugate base at: https://brainly.com/question/29870475

#SPJ1

F2 has a total of 18 electrons, 9 from each fluorine atom. Two electrons are shared in F2 and only one bond is formed between atoms.

The bond that occur between two atoms of fluorine is a covalent bond. A covalent bond involves sharing of electrons between two or more atoms.

Each fluorine atom has 9 electrons so the molecule has a total of 18 electrons in the molecule F2.

Since each atom contributes one electron each to the covalent bond, only one bond (F - F)is formed between fluorine atoms with two electrons shared.

Learn more: https://brainly.com/question/14283892

Answer:

When concentrated hydrochloric acid is added to a very dilute solution of copper sulfate, the pale blue solution slowly turns yellow-green on the formation of a copper chloride complex.

Explanation:

Answer: The reversible copper sulfate reaction

When concentrated hydrochloric acid is added to a very dilute solution of copper sulfate, the pale blue solution slowly turns yellow-green on the formation of a copper chloride complex.

Explanation:

Answer:

The person above me is correct  

Explanation:

It's D

According to the Foliated Metamorphic Rock Chart slate, phyllite, schist, and gneiss can all have the same parent rock (shale) is a true statement.

Slate, phyllite, schist, and gneiss are all types of metamorphic rocks that can be formed from shale, which is a sedimentary rock composed of clay and other fine-grained minerals. The specific type of metamorphic rock that is formed from shale depends on the conditions under which the shale undergoes metamorphism, including the temperature, pressure, and presence of fluids.

Slate is a fine-grained metamorphic rock with a uniform, flat surface and a layered structure. It is formed when shale undergoes low-grade metamorphism, which occurs at relatively low temperatures and pressures.

Therefore, Gneiss, on the other hand, is a medium- to coarse-grained metamorphic rock with a banded or wavy texture. It is formed when shale undergoes high-grade metamorphism, which occurs at higher temperatures and pressures.

Learn more about Metamorphic Rock  from

https://brainly.com/question/1176274

#SPJ1

GIVEN

• Mass of Al2O3 =, 408g

• Molecular mass Al2O3 =,101,96 g/mol

• Molecular Mass Oxygen =,15,999 g/mol

We will consider the following balanced chemical equation that takes place :

3 moles Oxygen reacts and produce 2 moles Al2O3

So, x moles Oxygen willreact and produce 4 moles Al2O3

Therefore,

X moles O2 = (4Moles Al2O3 *3 moles Oxygen ) / 2 moles Oxygen

= 6 moles of O2

(iii) Determine Mass of Oxygen :

Therefore, 95.99 grams of O2 are needed to produce 408g of Al2O3

0.01 mol/L is the molarity of given solution. 0.002 moles is added to 0.2 L solvent to make desired solution.

The amount of moles of solute found in a specific number of litres of the solution, or moles per litre of a solution, is known as molar concentration or molarity. Solutes are simply substances that can be found in solutions because a solution is defined as a homogenous mixture that comprises one or more solutes.

molar mass =342g /mol

number of moles=mass of solute / molar mass

0.45 /342 =0.002 moles

Volume solution =  50 mL / 1000 =0.2 L

M = n / V

M = 0.002 / 0.2

M = 0.01 mol/L

To know more about molarity, here:https://brainly.com/question/8732513

#SPJ1

The calculated formula masses to 133.5 amu, we find that the substance with a formula mass closest to 133.5 amu is (d) AlCl3. Therefore, the answer is option D.

To identify the substance with a formula mass of 133.5 amu, we need to calculate the formula mass of each given substance and compare it to 133.5 amu.

(a) MgCl2:

The formula mass of MgCl2 can be calculated by adding the atomic masses of magnesium (Mg) and chlorine (Cl).

Mg: atomic mass = 24.31 amu

Cl: atomic mass = 35.45 amu

Formula mass of MgCl2 = (24.31 amu) + 2(35.45 amu) = 95.21 amu

(b) SCl:

The formula mass of SCl can be calculated by adding the atomic masses of sulfur (S) and chlorine (Cl).

S: atomic mass = 32.07 amu

Cl: atomic mass = 35.45 amu

Formula mass of SCl = 32.07 amu + 35.45 amu = 67.52 amu

(c) BCl:

The formula mass of BCl can be calculated by adding the atomic mass of boron (B) and chlorine (Cl).

B: atomic mass = 10.81 amu

Cl: atomic mass = 35.45 amu

Formula mass of BCl = 10.81 amu + 35.45 amu = 46.26 amu

(d) AlCl3:

The formula mass of AlCl3 can be calculated by adding the atomic mass of aluminum (Al) and 3 times the atomic mass of chlorine (Cl).

Al: atomic mass = 26.98 amu

Cl: atomic mass = 35.45 amu

Formula mass of AlCl3 = 26.98 amu + 3(35.45 amu) = 133.78 amu. Option D

For more such questions on masses visit:

https://brainly.com/question/24191825

#SPJ8

Choosing a biome for a research project can provide a wealth of opportunities to better understand the natural world and contribute to important conservation and management efforts.

There are several convincing reasons for researchers to choose a particular biome for their project, some of which include:

Biodiversity: Biomes are characterized by their unique plant and animal species, which can provide a diverse range of research opportunities, including studying their adaptations, behaviors, and interactions.

Climate Change: Biomes are also influenced by climate change, making them an important area of research to better understand how these ecosystems are being affected by changes in temperature and precipitation patterns.

Human Impacts: Human activities, such as deforestation, agriculture, and urbanization, can have a significant impact on biomes. Studying these impacts can help researchers better understand how to mitigate and manage these effects.

Biogeochemical Cycles: Biomes are also important for studying biogeochemical cycles, such as the carbon and nitrogen cycles, which are essential for sustaining life on Earth.

Conservation: Finally, studying biomes can also contribute to conservation efforts, helping to preserve these unique ecosystems and the species that inhabit them.

Find out more on biome here: https://brainly.com/question/2096327

#SPJ1

Gold's atomic construction is bigger than tin because of the existence of more protons and neutrons.

The disposting of atoms in gold follows what's called a "​face-centered cubic" (fcc) structure. Put directly, the atoms in gold form cubes, with an atom at each of the districts, and another atom in the center of each of the faces (you can see what this looks like in the image below). Gold is an element.

An atom of gold carries 79 protons, 79 electrons, and (most commonly) 118 neutrons, making it among the dense of naturally happen. Gold is a chemical element with 79 protons in each atomic nucleus. Every atom carrying 79 protons is a gold atom and all gold atoms.

So we can conclude that gold has the chemical formula Au. Gold atoms join together in a giant metallic structure. Atomic Structure.

Learn more about Gold's here: https://brainly.com/question/24639749

#SPJ1

Answer:

???

Explanation:

Answer:

The graph shown is not a function because points (-1,2) and (-1,0) have the same x value.

Explanation:

Answer

Explanation

Given unbalanced chemical equation is:

_____B2O3 + _____HF -----> _____BF3 + _____H20

Step-by-step solution:

Step 1: Balance the Boron atom on both sides of the equation by putting 2 as the coefficient of BF₃ on the product side as shown below.

_____B2O3 + _____HF -----> 2 BF3 + _____H2O

Step 2: Balance the fluorine atoms on both sides by putting 6 as the coefficient of HF on the reactant side of the equation as shown below.

___B2O3 + 6 HF -----> 2 BF3 + _____H2O

Step 3: Balance the oxygen and hydrogen atoms on both sides of the equation by putting 3 as the coefficient of BF₃ on the product side as shown below.

HCH bond angle is ~110 degrees.

Answer:

The correct answer is 0.22 mol Te.

Explanation:

First, we have to calculate the mass of Te in the sample. We simply multiply the sample mass by the percentage of Te (28.53%= 28.53/100)

100.00 g x 28.53/100 = 28.53 g Te

The molar mass of Te is 127.60 g. Thus, the mass of 1 mol of Te is 127.60 g. With this, we calculate how many moles of Te there are in 28.53 g of Te:

28.53 g Te x 1 mol Te/127.60 g Te= 0.223 mol ≅ 0.22 mol

Answer:

A) Using the ideal gas law, we can calculate the number of moles of gas present:

```

PV = nRT

```

where:

* P = pressure (atm) = 1 atm

* V = volume (L) = 5.6 L

* n = number of moles of gas

* R = ideal gas constant = 0.08206 L atm / mol K

* T = temperature (K) = 273.15 K

Solving for n, we get:

```

n = (P * V) / RT

```

```

n = (1 atm * 5.6 L) / (0.08206 L atm / mol K * 273.15 K)

```

```

n = 0.25 mol

```

Therefore, there are 0.25 moles of gas present.

B) The molar mass of the gas can be calculated by dividing the mass of the gas (8.0 g) by the number of moles of gas (0.25 mol):

```

Molar mass = Mass / n

```

```

Molar mass = 8.0 g / 0.25 mol

```

```

Molar mass = 32 g/mol

```

The molar mass of the gas is 32 g/mol.

C) The common atmospheric gas with a molar mass of 32 g/mol is oxygen (O2). Therefore, the gas that was collected is oxygen.

Explanation:

Answer:

methane

Explanation: methane is obtained from the decaying of flora and fauna mostlyunder damp

Answer:

0.2 mole

Explanation:

From the question given above, the following data were obtained:

Number of molecules = 12.06×10²²

Number of mole =?

From Avogadro's hypothesis,

6.02×10²³ molecules = 1 mole

Therefore,

12.06×10²² molecules = 12.06×10²² / 6.02×10²³

12.06×10²² molecules = 0.2 mole

Thus, 12.06×10²² molecules is equivalent to 0.2 mole

Answer:

66 grams of ice would have to melt to lower the temperature of 352 mL of water from 15 °C to 0 °C.

Explanation:

To calculate the amount of ice that would have to melt to lower the temperature of 352 mL of water from 15 °C to 0 °C, we need to use the formula:

Q = m_water * c_water * ΔT_water + m_ice * Lf

where,
Q = the amount of heat transferred,
m_water = the mass of water, c_water is the specific heat capacity of water,
ΔT_water = the change in temperature of water, m_ice = the mass of ice,
Lf = the specific latent heat of fusion of ice.

First, let's calculate the amount of heat transferred to the water:

Q = m_water * c_water * ΔT_water
Q = 352 g * 1.0 cal/(g*°C) * (15-0) °C
Q = 5,280 cal

Next, we can use the specific latent heat of fusion of ice, which is 80 cal/g, to calculate the amount of heat required to melt the ice:

Q = m_ice * Lf
Q = m_ice * 80 cal/g
m_ice = Q / Lf
m_ice = 5,280 cal / 80 cal/g
m_ice = 66 g

The theoretical yield of Cu(NO3)2 is 20.259 grams.

To determine the theoretical yield of Cu(NO3)2, we need to calculate the amount of copper reacting with the silver nitrate and use stoichiometry to convert that amount to the molar mass of Cu(NO3)2.

First, let's find the molar mass of silver nitrate (AgNO3):

AgNO3 = 107.87 g/mol (Ag) + 14.01 g/mol (N) + 3 * 16.00 g/mol (O) = 169.87 g/mol

Next, we need to calculate the amount of copper that reacts with the given mass of silver nitrate. The molar mass of copper (Cu) is 63.55 g/mol.

Using the molar ratio from the balanced chemical equation, we can relate the moles of copper to the moles of silver nitrate. The balanced equation is:

Cu + 2AgNO3 -> Cu(NO3)2 + 2Ag According to the equation, 1 mole of copper reacts with 2 moles of silver nitrate.

Now we can calculate the moles of copper reacting with 36.7 g of silver nitrate:

moles of AgNO3 = (mass of AgNO3) / (molar mass of AgNO3)

moles of AgNO3 = 36.7 g / 169.87 g/mol = 0.2160 mol AgNO3

Using the stoichiometric ratio, we find the moles of Cu:

moles of Cu = (moles of AgNO3) / (2 moles of AgNO3 per 1 mole of Cu)

moles of Cu = 0.2160 mol AgNO3 / (2 mol AgNO3/1 mol Cu) = 0.1080 mol Cu

Finally, we can calculate the theoretical yield of Cu(NO3)2 using the molar mass of Cu(NO3)2:

theoretical yield of Cu(NO3)2 = (moles of Cu) * (molar mass of Cu(NO3)2)

theoretical yield of Cu(NO3)2 = 0.1080 mol * (63.55 g/mol + 2 * (14.01 g/mol + 3 * 16.00 g/mol))

theoretical yield of Cu(NO3)2 = 0.1080 mol * 187.56 g/mol

theoretical yield of Cu(NO3)2 = 20.259 g

For more such questions on theoretical yield visit:

https://brainly.com/question/14714924

#SPJ11

At 25 degrees Celsius, with 50g of sugar, the solution will appear clear and homogeneous, with all the sugar dissolved. The ratio of dissolved sugar to undissolved sugar will be 50:0, as all the sugar has dissolved.

If an additional 55g of sugar is added to the 25-degree water, the solution will become supersaturated. This means that the water cannot dissolve all the sugar, resulting in the excess sugar remaining undissolved as solid particles at the bottom of the container. The solution will appear cloudy, and the ratio of dissolved sugar to undissolved sugar will be 50:5, as only 50g of the added sugar can dissolve.

When the solution is heated, the solubility of sugar increases. As a result, more sugar will dissolve, and the solution will become clear again. The ratio of dissolved sugar to undissolved sugar will approach 105:0 as the temperature increases and more sugar dissolves.

If the heated solution is slowly cooled back to 25 degrees Celsius, the solubility of sugar decreases. This will cause the excess sugar to come out of the solution and form solid crystals, which will be visible as sugar particles. The solution will appear cloudy again, and the ratio of dissolved sugar to undissolved sugar will depend on the amount of sugar that remains dissolved after cooling.

Adding a seed crystal to the mixture provides a surface for sugar crystals to form, resulting in the rapid crystallization of the remaining dissolved sugar. The solution will become saturated with sugar crystals, and the ratio of dissolved sugar to undissolved sugar will be close to 0:55, as most of the sugar will have crystallized. The solution will appear cloudy with a significant amount of sugar crystals present.

For more such questions on degrees

https://brainly.com/question/29723347

#SPJ11

Answer:

please mark me as brainliest

Explanation:

5-pentanoic acid

The mass of krypton tetrachloride that can be produced assuming 100% yield is mathematically given as

molar mass=33.29g

Generally, the equation for ideal gas is mathematically given as

PV=nRT

Therefore

n=(0.50)(15.)/0.082*623

n=0.147mol

Hence for clorine

n=0.441mol

Given the reaction

Kr+2cl2---->KrCL4

Hence

molar mass=225.60*0.147

molar mass=33.29g

Read more about Chemical Reaction

https://brainly.com/question/11231920

#SPJ1

Answer: The calcium ion has a 2+ charge and the phosphate ion has a 3- charge.

Answer: C diamond has a different crystal structure from graphite

Explanation:

The difference between the properties of  two forms of carbon is that

Diamond has a crystal structure  different from graphite.

Graphite and Diamond are known as allotropes of Carbon as they have the

same chemical properties but different crystal structure.

Diamonds form a 3 crystal lattice with no flexibility while Graphite are

bonded to sheets which makes them slide easily within one another and

gives it its soft texture.

Read more on https://brainly.com/question/23491824

Answer:

\(\large \boxed{2 \, \%}\)

Explanation:

1. Data

Mass of graduated cylinder              =  47.229 g

Mass of graduated cylinder + water =  71.821  g

Actual volume of water                     = 25.0     mL

2. Calculations

(a) Mass of water

Mass = 71.821 g -47.229 g  = 24.592 g

(b) Volume of water

\(\text{Volume} = \dfrac{\text{mass}}{\text{volume }} = \dfrac{\text{24.592 g}}{\text{ 1 g/mL}} = \text{24.592 mL}\)

(c) Percent Difference

\(\begin{array}{rcl}\text{Percent difference}&= &\dfrac{\lvert \text{Measured - Calculated}\lvert}{ \text{Calculated}} \times 100 \,\%\\\\& = & \dfrac{\lvert 25.0 - 24.492\lvert}{24.492} \times 100 \, \% \\\\& = & \dfrac{\lvert 0.5\lvert}{24.492} \times 100 \, \%\\ \\& = & 0.02 \times 100 \, \%\\& = & \mathbf{2 \, \%}\\\end{array}\\\text{The percent difference is $\large \boxed{\mathbf{2 \, \%} }$}\)

Hetergeneous mixture   peanuts and almonds mixed ,a bucket full of sand and gravel. Homogeneous Mixture -food coloring dissolved in water together in a bowl,cup of tea and sugar .          

When the composition of a mixture is not constant throughout the mixture, the mixture is said to be heterogeneous. A variety of  make up vegetable soup. Each mouthful of soup will have variable proportions of the soup's various veggies and other ingredients.

For illustration A mixture of sugar and water, or salt and water, both of which have the same component ratio throughout the mixture, are examples of homogenous mixes.

TO know about Homogeneous Mixture& Heterogeneous Mixture visit:

https://brainly.com/question/24898889

#SPJ13