How many atoms are in a 4.67 g sample of silicon?

Answer:

proton 5+

electron 5-

neutron 0, neutral

Explanation:

Boron is the fifth element on the periodic table, meaning it's atomic# is 5. that is the # of protons. Protons have a positive chargé. The # of electrons in a neutrally charged atom is the same as the # of protons, because they're negatively charged. so if there are 5 protons, there are 5 electrons +5 + -5 = 0 chargé. The third subatomic particle is a neutron. It has a charge of 0, neutral, thus its name. You know there are 6 neutrons in a Boron atom because the atomic mass is 11. electrons have basically no weight, so 11 - 5 protons = 6 neutrons.

The subatomic particles in part Z of the boron atom are neutrons and protons. neutrons have a charge of zero while protons have a charge of +1. Note that Z represents the core of the boron atom.

The atom is composed of three fundamental subatomic particles which are;

Protons and neutrons are found at the core of the atom. This core is the center of the atom. The protons and neutrons are found inside the nucleus or core of the atom and are collectively called nucleons. Electrons move round the orbits of the atom.

Protons are positively charged, electrons are negatively charged while neutrons have no charge.

Part Z is the nucleus or core of the atom and contains neutrons and protons.

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Answer:

uhhhhh not sure i cant see it

Explanation:

Answer:

They are similar, because one can be obtained by dilating the other about the origin with a scale factor of 1/2.

Explanation:

The image is dilated by 1/2.

Take a look.

The coordinate labels of the preimage include: A, B, C, and D.

The coordinate labels of the image include: A', B', C', and D'.

Coordinates of point A: (2, 8)

Coordinates of point A': (1, 4)

**The preimage's x and y-coordinates multiplied by 1/2 will give you the x and y-coordinates of the image.**

Answer:

the mass of each element can be recovered from is 162.23 grams

Explanation:

the mass really depends on the volume. If there is 74.0% carbon, 8.6% hydrogen and 17.3% nitrogen then you first cross out the 0 and 3 which leaves you with 17% and 74%. Then all you have to do is multiply 17% and 74% and then divided it by 8.6%.

The various drugs such as the nicotine as additive drug is a pack of cigarette consist of about 75 of the carbon, 8.6% of hydrogen and about 17.3% of mitogen.

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Answer:

3. The limiting reactant is the reactant that gives you the smaller amount of product. Therefore HCI is the limiting reactant in this problem. In this reaction 9.4 grams of ZnCl2 will form and there will be leftover zinc that did not react.

The answer to the given operations with proper number of significant figures is 5.7 × 10².

Significant figures or numbers can be defined as those particular numbers or digits which are essential in determining the accuracy of a particular value. For example, 4.392 has 4 significant figures.

When we are rounding off a number to write it with the proper number of significant figures, we first need to decide the amount of significant figures that it should have.

On calculating the given operation,

⇒ 108 × 5.3 = 572.4

In significant figures,

= 5.72 × 10²

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When 200 grams of water cools from 50.0°C to 250°C, the total amount of heat energy released by the water is The total amount of energy released is 20, 930 J.

We will apply the formula. q = mCt, where q is the amount of heat energy released. m= mass. C is the specific heat of the water. T= temperature change. Because the specific heat of the water has not been specified, we will use the standard value of 4.186J/g °C. q = mCΔT. q = 200 × 4.186 × (50 -25) (50 -25) q = 200 × 4.186 × 25 q = 5000 × 4.186 q = 20, 930 The total amount of energy released is 20, 930 J.

In physics, energy (from Ancient Greek: v, enérgeia, "activity") is a quantitative property that is transferred to a body or a physical system and is visible in the performance of work as well as in the form of heat and light. Energy is a conserved quantity, which means that it can be converted in form but not created or destroyed. The joule is the SI unit of energy measurement (J).

The kinetic energy of a moving object, the potential energy stored by an object (for example, due to its position in a field), the elastic energy stored in a solid object, and the chemical energy associated with chemical reactions are all common types of energy.

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The gravitational force of attraction between the two objects would be 1.1858 x [tex]10^{-6[/tex] Newton.

The gravitational force of attraction between two objects of mass m1 and m2 is proportional to the product of the masses of the two objects and inversely proportional to the square of the distance between the two objects.

This is mathematically expressed as follows:

Gravitational force (F) = [tex]Gm_1m_2/d^2[/tex]

Where G is the universal gravitational constant and d is the distance separating the two masses.

In this case:

m1 = 8,000 kg

m2 = 5.0 kg

G = 6.67 x [tex]10^{-11[/tex] N m2 / kg2

d = 1.5 m

F = 6.67 x  [tex]10^{-11[/tex] x 8,000 x 0.5/1.5 x 1.5

  = 26680 x  [tex]10^{-11[/tex]/2.25

  = 11857.77 x  [tex]10^{-11[/tex]

   = 1.1858 x [tex]10^{-6[/tex] Newton

In other words, two spherical objects of masses 8,000 kg and 5.0 kg separated by a distance of 1.5 would have a gravitational force of attraction of 1.1858 x [tex]10^{-6[/tex] Newton between them.

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In a given reaction, the rate may be expressed as either the rate of formation of a product (X) or the rate of consumption of a reactant (Y). If the reaction is proceeding in the forward direction, the rate of formation of the product (X) will be positive and the rate of consumption of the reactant (Y) will be negative.

This means that X is being produced at a faster rate than it is being consumed and Y is being consumed at a faster rate than it is being produced.

Alternatively, if the reaction proceeds in the opposite direction, the rate of formation of products (X) is negative and the rate of consumption of reactants (Y) is positive. This means that X is consumed faster than it is produced, and Y is produced faster than it is consumed.

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The boiling point of a substance is determined by the strength of the interparticle forces between molecules.

Boiling point is the temperature at which a liquid changes state from liquid to gas, also known as its vaporization point. The boiling point of water at sea level is 100°C (212°F).

In the case of SiH4, the boiling point is higher than that of SiO2 due to the stronger nature of the intermolecular forces. This is because SiH4 is held together by stronger hydrogen bonds, resulting in more energy needed to break apart the molecules. On the other hand, SiO2 is held together by weaker dipole-dipole interactions and London dispersion forces, meaning it requires less energy to break apart the molecules and thus has a lower boiling point.

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2K + [tex]Cl_{2}[/tex] = 2KCl is the balanced net ionic equation for a redox reaction that results in the formation of potassium chloride.

Chlorine gas, Cl 2, will cause potassium metal, K, to burn, forming potassium chloride, KCl, an ionic molecule. This synthesis reaction is described by the following balanced chemical equation.

2K + [tex]Cl_{2}[/tex] = 2KCl

Consider this reaction to be a redox reaction as an alternative mental image. Here, chlorine gas is oxidizing potassium metal to produce potassium cations. Chlorine gas is converted into chloride anions during the process. The subsequent reaction between the potassium actions and the chloride anions will result in potassium chloride.

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Propane gas (C3H8) is ignited. Type of reaction combustion ignition.

[tex]C_3H_8(g)+5O_2(g) < = > 3CO_2(g)+4H_2O(l)[/tex] Balanced chemical equation.

A chemical equation is said to be balanced if the quantity of each type of atom in the reaction is the same on both the reactant and product sides. In a balanced chemical equation, the mass and the change are both equal.

The parent chain is the longest chain of carbon atoms that contains the double bond. Its name has the same stem as an alkane with the same number of carbon atoms, but it is designated as an alkene by adding the suffix -ene. Propene is the resultant chemical, CH2=CHCH3.

In accordance with the Law of Conservation of Mass, mass cannot be generated or destroyed in a chemical reaction. A balanced chemical equation has an equal number of atoms of each element on the left and right sides of the reaction.

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Based on this table which describes geological events, a statement that is most likely correct include the following: B. Event A represents volcanic eruption and Event B represents earthquakes.

Generally speaking, a divergent boundary is characterized by plates that are moving apart from one another, as well as basaltic volcanism and seafloor spreading. Also, a typical example of a divergent is the Mid-Atlantic Ridge.

In this context, we can reasonably infer and logically deduce that Event A is a geological event which most likely represents volcanic eruption because it occurred at both convergent and divergent boundary.

Furthermore, a convergent boundary simply refers to a region where lithosphere or crust is sinking into the mantle. Also, an example of a convergent is a region where subduction zones or collisions occur such as the west coast of South America.

In conclusion, a transform boundary simply refers to a boundary that is normally devoid of volcanism, but allows for the occurrence of earthquakes.

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The element box contains name and symbol of the element, number of protons and electrons, atomic mass, and electron configuration.

Each key incorporates an detail's name, precise symbol, atomic weight and atomic variety. Oxygen, for example, has an atomic variety of 8, an atomic weight of 15.996 and a completely unique symbol, O.  Each container represents an detail and incorporates its atomic size, symbol, common atomic mass, and (sometimes) name. The factors are organized in seven horizontal rows, referred to as intervals or series, and 18 vertical columns, referred to as groups. The container containing every detail's records is called the detail key. The table is split into 4 more or less square regions referred to as blocks. The rows of the desk are referred to as intervals, and the columns are referred to as groups. Elements from the equal institution of the periodic table display comparable chemical characteristics.

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Answer:

b. 23.3g

Explanation:

Based on the reaction:

CH₄ + 2O₂ → CO₂ + 2H₂O

To find the mass of CO2 produced we must find, as first, the limiting reactant. With limiting reactant we can find the moles and the mass of CO2 as follows:

Limiting reactant:

For a complete reaction of 0.53 moles of CH4 are necessaries:

0.53 moles CH4 * (2mol O2 / 1mol CH4) = 1.06 moles O2.

As there are 1.5 moles, CH4 is limiting reactant.

Moles CO2:

1 mole of CH4 produce 1 mole of CO2. That means the moles of CO2 formed are 0.53 moles.

Mass CO2 (Molar mass: 44.01g/mol)

0.53 moles CO2 * (44.01g / mol) =

b. 23.3g

Answer:

Reducing agent - S

Explanation:

The equation for the reaction is given as;

K2Cr2O3 + H2O + S --> SO2 + KOH + Cr2O3

The balanced equation is given as:

2K2Cr2O7 + 2H2O + 3S → 3SO2 + 4KOH + 2Cr2O3        

The reducing agent can be obtained by comparing the oxidation number of the elements. Increase in oxidation number signifies a reducing agent

K:

Reactant - 1

Product - 1

Cr

Reactant - +2

Product - +3

O

Reactant -   -2

Product -    -2

H

Reactant - +1

Product - +1

S

Reactant - O

Product - +4

S has an increase in oxidation number hence it is the reducing agent.

Although Cr has an increase in oxidation number, it occurs as a compound.

Both concentration and conductivity increase when larger amounts of sugar in a beaker of water dissolves.

The volume of the resulting solution will be larger than one quart if you dissolve a cup of sugar in a quart of water. In comparison to distilled water, the concentration of solutes inside the cell is higher. Most of the time, a particular amount of solvent can only dissolve a specific maximum amount of solute. This maximum amount is specified as the solubility of the solute. Only solutions with charge carriers will be able to conduct electricity. Simply having polar molecules in the solution is insufficient. It must be able to transfer electrons between points with the least amount of interference.

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Answer:

[tex]\boxed {\boxed {\sf 20.51 \ g \ NH_3}}[/tex]

Explanation:

If we want to convert from moles to grams, we must use the molar mass. This values tells us the mass of 1 mole of a substance. They can be found on the Periodic Table; they are equivalent to the atomic masses, but the units are grams per mole (g/mol) instead of atomic mass units (amu).

We have the compound ammonia or NH₃. Look up the molar masses for the individual elements.

Check for subscripts. There is a subscript of 3 after hydrogen. This means there are 3 atoms of hydrogen in 1 molecule of ammonia. We should multiply hydrogen's molar mass by 3.

Add nitrogen's molar mass.

Now, use the molar mass as a ratio.

[tex]\frac {17.031 \ g \ NH_3}{1 \ mol \ NH_3}[/tex]

Since we are trying to find the mass of 1.204 moles, we multiply by that value.

[tex]1.204 \ mol \ NH_3 *\frac {17.031 \ g \ NH_3}{1 \ mol \ NH_3}[/tex]

The units of "moles of ammonia" cancel.

[tex]1.204 *\frac {17.031 \ g \ NH_3}{1}[/tex]

The denominator of 1 can be ignored.

[tex]1.204 * 17.031 \ g \ NH_3[/tex]

[tex]20.505324 \ g \ NH_3[/tex]

The original measurement of moles has 4 significant figures, so our answer must have the same. For the number we calculated, that is the hundredth place.

The 5 in the thousandth place tells us to round to 0 to a 1 in the hundredth place.

[tex]20.51 \ g \ NH_3[/tex]

1.204 moles of ammonia is equal to 20.51 grams of ammonia.

The correct answer is 7.0 moles of AgNO3 will form 7.0 moles of Zn(NO3)2,

Mole ratio is the ratio between the number of moles of two substances that are involved in a chemical reaction. It is an important concept in stoichiometry, which is the study of the relationship between the amounts of reactants and products in a chemical reaction. Mole ratio is often expressed as a fraction, in which the numerator is the number of moles of one substance, and the denominator is the number of moles of the other substance.

Since the reaction is a 1:1 mole ratio of reactant to product:

AgNO3 → Zn(NO3)2

7.0 mol AgNO3 → 7.0 mol Zn(NO3)2

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The initial amounts of x and y required to form solid xy are 1 mol of x and 1 mol of y.

The initial amount is the starting point for any financial transaction.

In order to calculate the initial amounts of x and y that will result in the formation of solid xy, the following equation must be used:
nx = ny * (4.1/kp)
where nx and ny are the moles of x and y, respectively, and kp is the equilibrium constant of the reaction.
Given the information provided, we can calculate the moles of x and y:
nx = ny * (4.1/4.1) = ny
ny = (22.4 L * 1 mol/22.4 L) = 1 mol
Therefore, nx = 1 mol and ny = 1 mol.
This means that if the reaction is carried out in a 22.4 L container, the initial amounts of x and y required to form solid xy are 1 mol of x and 1 mol of y.

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Answer:

Explanation:

Answer:

A. none

Explanation:

after 200 years, it would be 100 years gone

50+50=100

An oxide of chromium crystallizes with the following unit cell (chromium = gray; oxygen = red)(Figure 1) --CrO3

In order to determine the formula of the oxide, we need to determine the ratio of chromium to oxygen atoms in the unit cell. From the provided unit cell, we can see that there is one chromium atom (gray) in the center of the unit cell, and four oxygen atoms (red) surrounding it. This gives us a ratio of 1:4 chromium to oxygen, which simplifies to a ratio of 1:4 or 1/5. Therefore, the formula of the oxide is CrO4.An oxide is a chemical compound that contains at least one oxygen atom and one other element. Oxides can be either inorganic or organic, depending on the element that is combined with oxygen. Inorganic oxides are compounds composed of a metal and oxygen. They can be further classified as acidic, basic or neutral depending on the oxidation state of the metal atom. Examples of inorganic oxides include water (H2O), carbon dioxide (CO2), sulfur dioxide (SO2), and nitrogen dioxide (NO2)

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Hydroelectric energy is a renewable form of energy used to generate electricity.

This energy is created by harnessing the power of moving water, typically from rivers and streams, to spin turbines and generate electricity.

Hydroelectric power plants are used to generate electricity for homes, businesses, and cities all over the world.

By utilizing the natural power of water, hydroelectric energy is a clean, safe, and reliable source of energy that helps reduce global carbon emissions. It is also a cost-effective energy source, making it a popular choice for many energy providers.

Hydroelectric energy is one of the most widely used sources of electricity in the world, with many countries heavily relying on it for their energy needs.

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The equilibrium concentration of a sulfate ion is 32× 10⁻⁶M can be added in a 1. 0 Dash L solution of strontium sulfate which is 0. 10 mol of Sr(CH3CO₂)₂.

Solubility is defined as the maximum amount of a solute that can be dissolved in a known quantity of the solvent at a certain temperature is its solubility.

The solubility of SrSO₄ is:

SrSO₄(s) → Sr²⁺(aq) + SO₄²⁻(aq)

Where Ksp is defined as:

Ksp = 3.2x10⁻⁷ = [Sr²⁺] [SO₄²⁻]

The concentration of Sr is:

0.10mol / 1L = 0.10M = [Sr²⁺]

Replacing in Ksp:

3.2x10⁻⁷ = [0.10M] [SO₄²⁻]

[SO₄²⁻] = 3.2x10⁻⁶M

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Answer:

make glucose

Explanation:

During photosynthesis, plants trap light energy with their leaves. Plants use the energy of the sun to change water and carbon dioxide into a sugar called glucose. Glucose is used by plants for energy and to make other substances like cellulose and starch