What is the percentage by mass of silicon (si) in iron aluminum silicate (Fe3Al2(SiO4)3)?

Answer:

D) Cobalt (III) chloride.

Explanation:

It is an unstable compound in which the cobalt atoms have a formal charge of +3.

It could be stable but at very low temperatures, while at high temperatures it is found as a gas.

I hope this answer helps you.

Cobalt(III) chloride, often known as cobaltic chloride, is an elusive and unstable cobalt and chlorine chemical with the formula CoCl₃. The cobalt atoms in this combination have a formal charge of +3. Here the correct option is D.

Due to its special characteristics, cobalt chloride (CoCl₃) is a chemical substance that is frequently utilized in scientific study. It is a crystalline solid that is pinkish-red and soluble in ethanol and water. Cobalt ions, which are necessary for the growth and development of both plants and animals, can be found in cobalt chloride.

Cobalt(III) chloride, often known as cobaltic chloride, is an elusive and brittle cobalt and chlorine chemical with the formula CoCl₃. The cobalt atoms in this combination have a formal charge of +3.

Thus the correct option is D.

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Nuclear energy to thermal energy

Answer:

option B

Explanation:

The correct answer is option B

A nuclear reactor is a device which is used to control and initiate the chain reaction. It is basically used in for power generation which can be used for many other purposes like electricity generation etc.

The energy transformation occurs in the core of a nuclear reactor is from nuclear energy to thermal energy.

Answer:

compound

Explanation:

An element is the type of substance that is made up of only one type of atom. It cannot be broken down further into other types of substances. Compounds and mixtures, on the other hand, contain more than one type of atom.

The substance that is made up of only one type of atom is an element. An element is a pure substance that cannot be broken down into other types of substances. Each element is made up of just one type of atom. Examples of elements include Oxygen(O), Hydrogen(H), or any substance on the periodic table of elements. On the other hand, a compound is a substance that is made up of more than one type of atom bonded together. An example of this is water (H₂O), which consists of hydrogen and oxygen atoms. Lastly, a mixture is a combination of two or more elements or compounds which have not reacted to bond together, and each component in the mixture retains its original properties.

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Answer:

The empirical formula is V₂O

Empirical formula of a compound is the formula that shows the simplest whole number ratio of the atoms of elements in a given compound. Empirical formula is normally calculated when the mass of each element in a compound is known or the percentage composition by mass of each element in a compound is known.

Step by Step Explanation:

Step 1: Percentage composition of each element

Percentage composition=(mass of an element/ mass of the compound)100%

Mass of Vanadium = 20.38 g

Mass of the compound = 23.58 g

% composition of Vanadium = (20.38 g/23.58 g) 100%

                                                 = 86.43 %

Mass of Oxygen = 23.58 g -20.38 g

                           = 3.2 g

% composition of oxygen = (3.2/g/23.58 g) 100%

                                          =  13.57%

Step 2: Find the number of atoms of each element in the compound

Number of atoms  = percentage composition/ atomic mass

Atomic mass of Vanadium = 50.94 g/mol

Number of atoms of V = 86.43 /50.94

                                  = 1.6967

Atomic mass of oxygen = 16 g/mol

Number of atoms of O = 13.57/16

                                      = 0.8481

Step 3:  Find the simplest ratio of atoms

Vanadium : Oxygen

            1.6967 : 0.8481

= 1.6967/0.8481 : 0.8481/0.8481

= 2: 1

Whole number ratio = 2 : 1

Therefore; the empirical formula is V₂O

Answer:

[tex]V_2O[/tex]

Explanation:

Hello,

In this case, for the given vanadium oxide we have the general formula:

[tex]V_XO_Y[/tex]

Whereas both X and Y are determined as shown below:

- Find the mass percentage of both vanadium and oxygen:

[tex]\% V=\frac{20.38g}{23.58g}*100\%=86.43\% \\\% O=\frac{23.58g-20.38g}{23.58g}*100\%=13.57\%[/tex]

- Then the representative moles:

[tex]n_V=\frac{86.42}{51}=1.695\\n_O=\frac{13.57}{16}=0.8482[/tex]

- Finally X and Y:

[tex]X=\frac{1.695}{0.8482}=2\\\\Y=\frac{0.8482}{0.8482}=1[/tex]

Thus, the empirical formula is:

[tex]V_2O[/tex]

Best regards.

The atom having 5 as the atomic number, and 11 has the mass number have 5 protons. Thus, option A is correct.

In an atom, the nuclei consists of protons and neutrons. The sum of the protons and neutrons in an atomic nuclei determines its mass number.

The atomic number of an atom is the number of protons in an atom. Thus, the number of protons in an atom in 5. Hence, option A is correct.

Learn more about mass number, here:

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its milk you cant do the experiment with out it.

Answer:

the quantity of milk drank by the kittens

Explanation:

Dependent variables are the actual variables a researcher sets out to determine during the course of an experiment. In order words, dependent variables are variables that are measured during experiments whose values fluctuate with the change of other variables.

In this case, a change in the type of milk given to the kittens affected the quantity of milk drank by the animals.

The actual variable being measured in this experiment is the amount to milk drank by the kittens.

Hence, the dependent variable is the quantity of milk drank by the kittens.

Answer:

The new volume of this gas is 6.86 liters.

Assumption: the temperature of this gas stays the same, and this gas is ideal such that Boyle's Law applies.

Explanation:

By Boyle's Law, the volume of an ideal gas shall be inversely proportional to the pressure on it when temperature stays the same (as in an isothermal process.)  

In other words,

[tex]\displaystyle V \propto \frac{1}{P}[/tex],

where

[tex]P_1 \cdot V_1 = P_2 \cdot V_2[/tex].

[tex]\displaystyle V_2 = \frac{P_1 \cdot V_1 }{P_2}[/tex].

Assume that this gas is ideal. Also assume that this increase in pressure is isothermal. Apply Boyle's Law to find the new volume of this gas:

[tex]\displaystyle V_2 = \frac{P_1 \cdot V_1 }{P_2} = \rm \frac{0.98\;atm \times 10.5\; L}{1.50\; atm} = 6.86\; L[/tex].

Answer:H=2 I=2 J=2

Explanation:

Answer:

H= 2

I= 2

J=2

Explanation:

Just did this answer on ingenuity. :)

Answer: Plant growth, animal actions and pressure release

Explanation:

The weathering is a process of disintegration of rocks into small pieces and sediments. This is caused by chemical or physical agents.

Mechanical weathering is also called as physical weathering. It is caused by the physical activities on the surface of rocks. The following are the examples of mechanical weathering.

1. Plant growth: The plants which grows over the surface of rocks, their roots may penetrate the rocks which causes the disintegration or rocks.

2. Animal actions: The animals may exert their pressure over the surface of rocks. They may create burrows like rat or mice inside the rocks.

3. Pressure release: The rock which was under pressure, instantly if pressure released, the structure of rock will become unstable, this may lead to the disintegration of the rock.

Answer:

211.9 J

Explanation:

The molecules of water release heat during the transition of water vapor to liquid water, but the temperature of the water does not change with it.

The amount of heat released can be represented by the formula:

[tex]Q=mL_e[/tex]

where [tex]Q[/tex] = heat energy, [tex]m[/tex] = mass of water and [tex]L[/tex] = latent heat of evaporation.

The latent heat of evaporation for water is [tex]L=2257 kJ/kg[/tex] and the mass of the water is [tex]m=93.9 g=0.0939 kg[/tex].

The amount of heat released in this process is:

[tex]Q=mL_e = (0.0939kg)(2257 kJ/kg)=[/tex] 211.9 J

Answer:

=933.3 grams

Explanation:

Magnesium reacts with oxygen producing magnesium oxide according to the following equation.

2Mg₍s₎ + O₂₍g₎→ 2MgO₍s₎

From the above equation, 2 moles of Magnesium produces 2 moles of magnesium oxide. Therefore the ratio of magnesium to magnesium oxide produced is 1:1

1 mole of magnesium oxide has a mass of: 24+16 =40 grams

560 grams of magnesium=560/24 moles

=70/3 moles.

Since the ratio is 1:1 the reaction produces  70/3 moles of magnesium oxide.

70/3 moles of MgO= 70/3 moles× 40 grams

=933.3 grams

Answer:

Here's what I get.

Explanation:

[tex]\begin{array}{lcccc}\textbf{(a)} \qquad \text{Na} & \text{reacts with} & \text{ diatomic chlorine}& \text{to form} & \text{sodium chloride}\\\textbf{(b)}\qquad \text{Na} & + & \text{Cl}_{2} & \longrightarrow \, & \text{NaCl}\\\textbf{(c)}\qquad \text{2Na}& + & \text{Cl}_{2} & \longrightarrow \, & \text{2NaCl}\\\end{array}[/tex]

(d) Mass of chlorine

(i) We know we will need an equation with masses and molar masses, so let’s gather all the information in one place.  

M_r:                  70.91      58.44

            2Na   +   Cl₂ ⟶ 2NaCl

m/g:                                   117

(ii) Calculate the moles of NaCl

[tex]\text{Moles of NaCl} = \text{117 g NaCl} \times \dfrac{\text{1 mol NaCl}}{\text{58.44 g NaCl }} = \text{2.002 mol NaCl }[/tex]

(iii) Calculate the moles of Cl₂

The molar ratio is (1 mol Cl₂ /2 mol NaCl)

[tex]\text{Moles of Cl$_{2}$}= \text{2.002 mol NaCl} \times \dfrac{\text{1 mol Cl$_{2}$}}{\text{2 mol NaCl}} = \text{1.001 mol Cl$_{2}$}[/tex]

(iv) Calculate the mass of Cl₂

[tex]\text{Mass of Cl$_{2}$} = \text{1.001 mol Cl$_{2}$} \times \dfrac{\text{70.91 g Cl$_{2}$}}{\text{1 mol Cl$_{2}$}} = \text{71.0 g Cl$_{2}$}\\\\\text{The mass of chlorine needed is } \boxed{\textbf{71.0 g Cl$_{2}$}}[/tex]

Answer:  Hydrogen reacts with oxygen to form water

Explanation:   Chemical changes are those which changes the identity of the chemical nature of any substance.

Thus out of the given options , the correct one is the formation of the water molecule when hydrogen reacts with oxygen as it is changing the identity of hydrogen and oxygen atoms to form a molecule of water.

The rest of the three options belongs to the category of the physical changes in which the chemical nature of any substance has not been changed but only the properties which an be easily observed can be changed.

Answer:

ρ = 0.787 g/cm³

Explanation:

1 mL= 1 cm³

30.0 mL= 30 cm³

Density = mass/volume

The mass provided in the question= 23.6 grams

Volume= 30.0 cm³

Thus density= 23.6 grams/ 30.0 cm³

=0.787 g/cm³

If required in kg/ m³ the density will be calculated as follows.

There are 1000 g in 1 kg thus the density =

=0.787 g/cm³ ×1000

=787 kg/m³

Answer:

less than the reactants

Explanation:

Since the reaction is exhotermic, meaning that they have already released energy in the bonding, the product is releasing heat energy, and the reactants were not, so the products would have less bonding energy than the reactants.

Answer:

1. c

2.b

Explanation:

Answer:

y=108.45

0.66y=0.9x+0.48

0.66*108.45 =0.9x+0.48

71.577=0.9x+0.48

71.577-0.48=0.9x

71.097=0.9x

x=71.097/0.9

x=78.99667

Final answer:

Gravity is an ever-present, attractive force that holds together the Universe, from maintaining our footing on Earth to influencing the motions of galaxies and beyond. It is defined by Newton's law of gravitation and further explored in the theory of general relativity.

Explanation:

Gravity is a fundamental force of nature that is always attractive, causing objects with mass to be pulled toward each other. Even though gravity is the weakest of the four fundamental forces, it plays a crucial role in structuring the Universe. From binding us to the surface of Earth to keeping planets in orbit around the Sun, and even holding galaxies together, gravity is essential for the existence and movement of celestial bodies. Newton's universal law of gravitation states that gravitational force is directly proportional to the masses of the objects involved and inversely proportional to the square of the distance between their centers. On a cosmic scale, gravity is the dominant force and is important for understanding the interactions of matter in space and time. Additionally, in the realm of general relativity, gravity is responsible for curving space and altering the flow of time near massive bodies like stars.

Answer:

B, D, F

Explanation:

The polyatomic ion statements are

- Polyatomic ions have one overall charge.

- Polyatomic ions are made up of two or more types of atoms.

- Polyatomic ions are ions composed of two or more atoms that are covalently bonded together and carry an overall electrical charge due to the loss or gain of electrons.

- They have one overall charge because the entire molecule gains or loses electrons to become an ion.

- Polyatomic ions are composed of two or more types of atoms, usually including both nonmetals and sometimes a central metal atom.

Complete Question:

Which statements describe polyatomic ions? Check all that apply.

- Polyatomic ions have many charges.

- Polyatomic ions have one overall charge.

- Polyatomic ions repel other ions to form ionic bonds.

- Polyatomic ions attract other ions to form ionic bonds.

- Polyatomic ions are made up of only one type of atom.

- Polyatomic ions are made up of two or more types of atoms.

Answer:

=1.068 ×10⁻¹³N

Explanation:

Force of gravity =Gm₁m₁/d² where G is the universal gravitation constant =G = 6.673 x 10-11 N m²/kg², m₁ and m₂ is the mass of object 1 and 2 respectively and d is the distance between them. First we change the distance into SI units i.e meters 25 km= 25000 m

F= (6.673 x 10⁻¹¹ N m²/kg²×1000 kg×1000 kg)/ (25000 m)²

=1.068 ×10⁻¹³N

Final answer:

The magnitude of the force of gravity between two 1000 kg cars separated by 25.0 km is 1.067 × 10^-6 Newtons, using Newton's law of universal gravitation.

Explanation:

To calculate the magnitude of the force of gravity between the two 1000 kg cars separated by 25.0 km, we can use Newton's law of universal gravitation, which is expressed by the formula:

F = G × (m1 × m2) / r2

Where:

Putting in the given values:

F = (6.674 × 10-11 N × (m/kg)2) × (1000 kg × 1000 kg) / (25,000 m)2 = 1.067 × 10-6 N

Thus, the force of gravity between the two cars is extremely small, 1.067 × 10-6 Newtons, which is consistent with the fact that the gravitational force is very weak at such distances and with masses as small as that of cars.

Charles's law states that the volume of a gas is directly proportional to its Kelvin temperature when the pressure is constant.

Charles's law states that the volume of a given amount of gas is directly proportional to its temperature in the Kelvin scale, as long as the pressure remains constant.

We can express this relationship mathematically as V/T = constant, where V is the volume and T is the temperature in Kelvin.

In summary, Charles's Law helps us understand how gases behave under different temperatures, making it an important principle in the study of gases and their properties.

Answer:

26.73 mg.

Explanation:

no. of moles of magnesium chlorate (Mg(ClO₃)₂) = mass/molar mass = (72.03 mg)/(191.21 g/mol) = 0.377 mmol.

Every 1.0 mole of magnesium chlorate (Mg(ClO₃)₂) contains 2.0 moles of Cl.

∴ The no. of moles of Cl in magnesium chlorate (Mg(ClO₃)₂) = 2(0.377 mmol) = 0.754 mmol.

∴ The mass of Cl are found in 72.03 mg of magnesium chlorate (Mg(ClO₃)₂) = (no. of moles of Cl)(atomic mass of Cl) = (0.754 mmol)(35.453 g/mol) = 26.73 mg.

Answer:

Meaning; Geography is a focus within the curriculum for understanding and resolving issues about the environment and sustainable development. It is also an important link between the natural and social sciences. As pupils study geography, they encounter different societies and cultures.

Importance; Geography is important because it contributes to our knowledge of the world and its phenomena. But, it also has an amazing practical side. For economists and managers, some types of engineering, farmers, architects, geopoliticians, generals and some knowledge of Geography is extremely important.

brainiest plz

Explanation:

Answer:

Geography is the physical features of places and landmarks around the globe.

Explanation:

Geography is important because it marks where places are, and geography can help you find you way.

Answer:

Explanation:

Work is the result of applying a force that manages to move a mass.

Thus, the work (mechanical work in this case because this is a mechanical force, not an electrical one) applied by a constant force is the product of the force times the distance that the object is moved.

Also, you can calculate the mechanical work as the difference in the mechanical energy between the initial and the final stages of the event where the force was applied.

Let's see each choice:

a) Holding a mass for 1 hr: since no translation is involved, displacement is and the work is zero.

b) Holding 1 kg mass: again, no motion is involved, so there is no work.

c) Moving 1 m in 1 hr: there is not force involved in this statement, so there is not work.

d) lifting a 1 kg mass 1 m: this, indeed, describes a situation where work results from applying a lifting force to move a mass 1 m up.

In this case, such work is equal to the change in the potential energy of the mass: mgΔh = 1kg × 9.8m/s² × 1 m = 9.8 joules.

Answer:

D lifting a 1 kg mass 1 m

Explanation:

Took the test and got 100%

Answer:

Nitrogen oxide is compound.

Explanation:

Compound is defined as chemical substance made up two or more than two different elements. For example : NaOH is the compound made up of 1 sodium atom, 1 oxygen atom and 1 hydrogen atom.

Now, according to the question, out iron and nitrogen oxide. Nitrogen dioxide (NO)is a compound because its made up of one nitrogen atom and 1 oxygen atom.

Where as iron is not a compound because it is just composed of iron atoms only.

Answer:

According to Brittanica, "Internal energy [is] the property or state function that defines the energy of a substance in the absence of effects due to capillarity and external electric, magnetic, and other fields."

Answer:

1.79 mol.

Explanation:

2NaCl + F₂ → 2NaF + Cl₂.

It is clear that 2 mol of NaCl react with 1 mol of F₂ to produce 2 mol of NaF and 1 mol of Cl₂.

where, P is the pressure of the gas in atm (P = 1.2 atm).

V is the volume of the gas in L (V = 18.3 L).

n is the no. of moles of the gas in mol (n = ??? mol).

R is the general gas constant (R = 0.0821 L.atm/mol.K),

T is the temperature of the gas in K (299 K).

∴ no. of moles of F₂ (n) = PV/RT = (1.2 atm)(18.3 L)/(0.0821 L.atm/mol.K)(299 K) = 0.895 mol.

Using cross multiplication:

2 mol of NaCl is needed to react with → 1 mol of F₂, from stichiometry.

??? mol of NaCl is needed to react with → 0.895 mol of F₂.

∴ The no. of moles of NaCl needed = (2 mol)(0.895 mol)/(1 mol) = 1.79 mol.

Answer:

it will stay a gas

Explanation:

by heating up a gas you are making sure the gas stays a gas

Answer:

Polypeptide chain

Answer:

[tex]\boxed{\text{C. the equilibrium between the solid and its ions in solution}}[/tex]

Explanation:

[tex]\rm MX(s) $\, \rightleftharpoons \,$ M$^{+}$(aq) + $^{-}$(aq); $K_{\text{sp}}$ = [M$^{+}$][X$^{-}$]\\\\\text{$K_{\text{sp}}$ gives us information on}\\\\\boxed{\textbf{ the equilibrium between the solid and its ions in solution}}[/tex]

It tells us nothing about the amount of precipitate that will form or the temperature at which the equilibrium occurs.

Answer: Option (C) is the correct answer.

Explanation:

An ionic solid is defined as the solid in which atoms are chemically combined together due to transfer of electrons.

As all ionic substances are soluble in water. So, when an ionic solid is dissolved in water then it will dissociate into ions.

As a result, an equilibrium will be maintained between the solid and its ions into the solution.

For example, [tex]AB(s) \rightleftharpoons A^{+} + B^{-}[/tex]

                 [tex]K_{sp} = \frac{[A^{+}]}{[B^{+}]}[/tex]

where,    [tex]K_{sp}[/tex] = solubility product

Thus, we can conclude that the information described by the solubility product constant is that there is equilibrium between the solid and its ions in solution.

Answer:

The correct answer for this is: [tex] O _ 3 [/tex].

Explanation:

It is in a molecule of O3 that the two electron dot structures describe the bond equally well.

The [tex] O _ 3 [/tex] molecule is called trioxygen and more commonly known as ozone. It is a pale blue colored gas having a strong pungent smell.

This inorganic molecule is widely used in the oxidation process in the industries as well as consumer application.