Hi:) anyone able to explain the last column? Thanks !!

Answer:

+2

Explanation:

If a compound [tex]SO[/tex] existed, we would identify the oxidation state of sulfur using the following logic:

That said, in this hypothetical compound S would have an oxidation state of +2.

The density of lead if cube measuring 2 cm per side has a mass of 90.8 g is 11.35 g/cm^3

Explanation:

Density is equal to mass is divided by volume.

It is given that mass of 90.8 grams

we can find the volume of cube by height multiplied by width multiplied by depth.

Because all sides of cube are of same length.

Volume just ends up being 2^3

(2 cm)^3 = 8 cm ^3

Now plug both of these numbers into density equation

ρ =m/v

=90.8 g / 8 cm ^3

=11.35 g/cm^3

Answer:

Yes. all the accelerating charged electron particles produces the Electromagnetic wave.  

Explanation:

Magnetic fields are produced during the movement of the charged particle. the magnetic field produced, will exert some force in the moving charges. The electric field as well as the magnetic field travelling in the empty space with respect of speed of light are the electromagnetic wave. Moving electron will always produce the magnetic field and thus the electrons motion are constant,but when the acceleration starts the electromagnetic waves are being radiated.

Answer:

x=-8

Explanation:

First you move the -6 over to the -10 (which makes the -6 a 6)

Then you solve -10+6=-4

Then do -4 times 2 which equals 8

HOPE THIS HELPS

Answer:

 Mass of PbS = 9.26 g

Explanation:

Data Given :

mass of H₂S = 5.00 g

mass of PbS = ?

Reaction Given:

                Pb(CH₃COO)₂ + H₂S ----→ PbS + CH₃COOH

Solution:

Balance the equation:

                      Pb(CH₃COO)₂ + H₂S ----→ PbS + 2CH₃COOH

Now Look for the number of moles of H₂S and PbS meta

                    Pb(CH₃COO)₂ +  H₂S  ----→  PbS  +  2CH₃COOH

                                                1 mol          1 mol

So,

1 mole of H₂S combine with excess (unlimited) supply of Pb(CH₃COO)₂ and produce 1 moles of PbS

Now Convert moles to mass for which we have to molar masses of  H₂S and PbS

Molar mass of H₂S = 2 + 32 = 43 g/mol

Molar mass of PbS  = 31 + 32 = 63 g/mol

                    Pb(CH₃COO)₂ +       H₂S       -------→            PbS      +  2CH₃COOH

                                                1 mol (34 g/mol)          1 mol (63 g/mol)

                                                     34 g                              63 g

So,

34 g of H₂S  produces 63 grams of PbS.

Now

What mass of silver is produced from 5 g of H₂S  

Apply unity formula

                          34 g of H₂S   ≅ 63 g of PbS

                          5 g of H₂S   ≅ X g of PbS

By doing cross multiplication

                     Mass of PbS = 63 g x 5 g / 34 g

                     Mass of PbS = 9.26 g

To balance the given equation, add a coefficient of 2 in front of CH3COOH. 0.147 mol of PbS is produced, which is equal to 35.19 g of PbS.

To balance the given equation, we need to ensure that the number of atoms of each element is the same on both sides of the equation. Let's start by counting the number of atoms for each element in the given equation:

From the above counts, we can see that the number of oxygen atoms is not balanced. We can balance the equation by adding a coefficient of 2 in front of CH3COOH:

Pb(CH3COO)2 + H2S → PbS + 2CH3COOH

Now, the equation is balanced, and we can calculate the number of grams of PbS produced. From the balanced equation, we can see that 1 mole of PbS is produced for every 1 mole of H2S reacted. The molar mass of H2S is 34.08 g/mol, so 5.00 g of H2S is equivalent to 5.00/34.08 = 0.147 mol. Therefore, 0.147 mol of PbS is produced, which is equal to 0.147 x 239.36 = 35.19 g of PbS.

Answer:

V₂ = 1167.8 mL

Explanation:

Given data:

Initial Volume of gas = 250 mL

Initial Pressure = 355 KPa

Final pressure = 76.0 Kpa

Final volume = ?

Solution:

P₁V₁ = P₂ V₂

V₁ = Initial volume

P₁ = Initial Pressure

V₂ = Final volume  

P₂ = Final Pressure

Now we will put the values in formula.

P₁V₁ = P₂ V₂

V₂ = P₁V₁ / P₂

V₂ = 355 KPa 250 mL / 76.0 Kpa

V₂ = 88750 mL / 76.0

V₂ = 1167.8 mL

Answer:

T₂  = 84.375 K

Explanation:

Given data:

Initial volume = 3.3 L

Initial pressure = 2000 torr

Initial temperature = 225 K

Final temperature = ?

Final volume = 2.75 L

Final pressure = 900 torr

Formula:

P₁V₁/T₁ = P₂V₂/T₂  

P₁ = Initial pressure

V₁ = Initial volume

T₁ = Initial temperature

P₂ = Final pressure

V₂ = Final volume

T₂ = Final temperature

Solution:

P₁V₁/T₁ = P₂V₂/T₂  

T₂  = P₂V₂ T₁ /P₁V₁

T₂  = 900 torr× 2.75 L× 225 K / 2000 torr×3.3 L

T₂  = 556875 K/ 6600

T₂  = 84.375 K

Answer: it will take 89.93secs

Explanation:Please see attachment for explanation

Answer:

option D : when ΔH is positive and ΔS isnegative

Explanation:

The answer will be explained by the following equation for the gibbs free energy

                        G = H - TS

Where

G = gibbs free energy

H = enthalpy of a system (heat

T = temperature

S = entropy

So the change in the gibbs free energy at constant temperature can be written as

                ΔG = ΔH - TΔS . . . . . . (1)

Where

ΔG = Change in gibbs free energy

ΔH = Change in enthalpy of a system

ΔS = Change in entropy

During a spontaneous reaction the energy given in the form of heat that is ΔH or spontaneous due to disorder of the system that is ΔS are the driving forces of gibbs free energy.

Gibbs free energy is a state function and the change in gibbs free energy is equal to the change in enthalpy minus product of temperature and change in entropy as shown in equation 1

                        ΔG = ΔH - TΔS . . . . . . (1)

From the above equation it is obvious that ΔG will be positive for any reaction for which ΔH is positive and ΔS is negative. when ΔG is positive the reaction will be non spontaneous and unfavorable.

So,

option D is correct: when ΔH is positive and ΔS is negative

Answer:

The correct option is B ) No, they would compete for all necessary resources.

Explanation:

In ecology, a niche can be described as the role that an organism plays in a community or ecosystem. The niche of a species describes what food a particular organism eats, the place it lives, the place it reproduces and the relationship it has with other organisms of the community.

If two species belong to the same niche at a time, then they will fight for resources between them. As a result, one of the species will have to move from the place. One of the species might become get killed due to competition. Hence, two different species cannot belong to the same niche at a time.

Answer:

According to the following position vs. Time graph the bicyclist was : D

D. Not moving for the first two seconds, then begin moving at the constant speed.​

Explanation:

[tex]Speed = \frac{Distance}{time}[/tex]

Along Y-axis = Distance in meters

Along X-axis = Time taken in second

Answer:

The correct option is:

A) by direct or indirect contact between objects at different temperatures

Explanation:

Heat can be transferred in three different methods:

Conduction, Convection and Radiation

Conduction is heat transfer through direct contact between substances at different temperatures.

Convection is the heat transfer which takes place through air currents.

Radiation is the heat transfer that does not require contact between two objects.

Hence, heat transfer can take place through direct or indirect contact between objects at different temperatures.

Answer:

Hydrogen is the limiting reagent.

Explanation:

Limiting Reagent : It is the substance that get consumed when the reaction complete. It is used to determine the what amount of product will be formed.

When [tex]H_{2}[/tex] and  [tex]N_{2}[/tex] react, it will produce

[tex]NH_{3}[/tex] gas . The balance reaction can be written as:\

[tex]N_{2}(g) + 3H_{2}(g) \rightarrow 2NH_{3}(g)[/tex]

Here, 1 mol  [tex]N_{2}[/tex] require 3 mol [tex]H_{2}[/tex]

In question ,

[tex]moles = \frac{given\ mass}{Molar\ mass} [/tex]

Molar mass of H2 = 2 g/mol , given mass = 5 g

[tex]moles\ of\ H_{2} = \frac{5}{2}[/tex]

[tex] H_{2}[/tex] = 2.5 mole

[tex]moles\ of\ N_{2} = \frac{28}{28}[/tex]

Molar mass of N2 = 28 g/mol , given mass = 28 g

[tex] N_{2}[/tex] = 1 mole

Since, 1 mole  [tex]N_{2}[/tex] require 3 mole [tex]H_{2}[/tex]

But available , mole of  [tex]H_{2}[/tex] = 2.5

So we need extra 0.5 moles of Hydrogen gas

Hence [tex]H_{2}[/tex] get consumed first , Thus Hydrogen is the limiting reagent

An isotope having the same number of neutrons as Sulfur-32 would have a mass number of 32 and atomic number of 16. This is because S-32 has an atomic number of 16 (16 Protons) and mass number of 32 resulting in 16 Neutrons (32-16).

To find the isotope that has the same number of neutrons as sulfur-32, you must look at the atomic number and mass number. An isotope is an atom with the same number of protons but different numbers of neutrons. Sulfur-32 has an atomic number of 16, so it has 16 protons. Its mass number, 32, is the total of the protons and neutrons. This means, it has 16 neutrons (32-16 = 16). So, any isotope with a mass number of 32 and atomic number of 16 has the exact same number of neutrons as sulfur-32.

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Answer:

C₂H₄O₂ and NaC₂H₃O₂ are reactants.

Explanation:

Word equation:

Acetic acid + sodium acetate  → sodium diacetate

Chemical equation:

C₂H₄O₂ + NaC₂H₃O₂  →  C₄H₇NaO₄

This is a synthesis reaction in which simple reactants combine to form complex product.

This is also balanced chemical equation because there are equal number of atoms of all elements on both side of equation. Thus it follow the law of conservation of mass.

Law of conservation of mass:

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

This law was given by french chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

Answer:

Chemical reactions occur when chemical bonds between atoms are formed or broken. The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products

Chemical reactions occur when atoms in reactants form new products, leading to changes in energy and entropy. Factors like temperature, concentration, and the use of catalysts influence the rate and spontaneity of reactions.

Chemical reactions transpire when atoms in the reactants rearrange their chemical bonds to form products. This rearrangement leads to a change in total energy, as the new bonds have different energy levels compared to the original bonds in the reactants. There are several reasons and conditions under which chemical reactions occur:

In summary, chemical reactions occur due to the reorganization of atoms to form more stable or favorable products, driven by changes in energy and entropy and influenced by various factors that affect reaction rates.

Answer:

H =2; I = 2; J = 2  

Explanation:

Carbon is element 6 in the Periodic Table.  

Start at element 1 (H) and count from left to right until you reach element 6 (C).

You get the electron configuration

C: 1s² 2s²2p².

Thus,

H =2; I = 2; J = 2

Answer:

H=2

I=2

J=2

Explanation:

i took this warm up

Answer:

Of course :may include all of these characteristics

Because all answers are correct :they react with acids that have H+ ions and they all have OH- ions so they can be electrons donors and produce these ions in solution

:)

Answer:

The answer is may include all of these characteristics.

Explanation:

In chemistry, the term bases is used to describe substances that release hydroxide ions in aqueous solution. They are also generally proton acceptors as well as electron pair donors. Some examples of them are the hydroxides of the alkali metals and the alkaline earth metals. Due to this, the correct answer is letter D.

Answer:

most liquids do expand when they freeze

Explanation:

water is actually one that expands and there are probably many more too

i hope this helps you

Final answer:

Water expands when it freezes, which could cause up to 30% of cells to burst in frozen human bodies, thereby posing significant challenges to the concept of cryopreservation. This expansion force also necessitates antifreeze in engines and causes pipes to burst if they freeze.

Explanation:

Most liquids typically contract when they freeze, but water is an exception to this rule. Water expands by about 9% when it freezes, which can lead to significant damage in biological cells. This occurs because ice crystals grow as water solidifies, leading to an increased volume. If human bodies were to be preserved by freezing, the same force that can fracture boulders and engine blocks would cause up to 30% of cells to burst. Consequently, when considering the possibility of preserving human bodies for future revival, extensive cell damage due to the expansion of water upon freezing poses a considerable challenge.

This expansion of water upon freezing underpins the need for antifreeze in engines and the prevention of pipe bursts during cold weather. Furthermore, the unique property of water expanding instead of contracting upon freezing allows ice to float, creating an insulating layer on bodies of water that preserves aquatic life in colder environments.

Answer: covalent bond

Explanation: covalent bonded compounds do not conduct electricity. Hence, they are used as insulators

Answer:

Chloroplasts

Explanation:

Chloroplasts is an organelle found only in plants and eukaryotic algae that captures sunlight and converts that energy into food.

Answer:

chloroplasts

Explanation:

i searched this

Answer:

"Freezing point  and ability to react with oxygen" are chemical properties

Explanation:

The change of liquid into solid is the freezing point. The melting point is more than the freezing point in certain cases of mixtures for certain organic compounds like fats. As soon as the mixture freezes it becomes solid and which results in change in the composition from the liquid and solid in this way the it drastically reduces the freezing point. The melting point gets higher due to the pressure. This happens due to the release of heat of which results in the rise of temperature to the freezing point .Also the reaction of elements with oxygen which leads to formation of new substance is also an chemical property

Answer:

m(CuSO4×5H2O)=424.0 g

M(CuSO4×5H2O)=249.68 g/mol

n=m/M

n(CuSO4×5H2O)=1.7 mol

There are 9 atoms of oxygen in each formula unit of CuSO4×5H2O. Therefore,

n(O)=8.5 mol

M(O)=16 g/mol

m=M×n

m(O)=135.6 g

Explanation:

Answer:

A = is for central atom = Cl = 1

N = is the total number of lone pair of electron = 2

Explanation:

AXN for ClO3- is

A = 1 = 1 Cl

X = 3 ( X = the number of particles attached = O3 = 3 )  

N = 1 lone pair of electron

The value for A, which is the chemical compound CIO⁻₃ for the chlorate ion is 24.

To find A, we add the number of valence electrons contributed by each atom:

A = Valence electrons of Cl + Valence electrons of O + Charge of the ion

A = 7 + 18 + (-1) (since the chlorate ion has a charge of -1)

A = 7 + 18 - 1

A = 24

The A value for the chemical compound CIO⁻₃ a chlorate ion is given as 24

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Explanation:

you're already have a molarity in Question

Molarity M = numer of moles (n) / Volume (Liter)

first you must convert ml to L > 500 ml = 0.5 L

so 2.2 = n / 0.5

n = 2.2 × 0.5 = 1.1 moles

now you are already have number of moles and from the question you have K2O and you can calculate Molecular weight for K2O

K=39

O=16

Mw = 2×39 + 16 = 94

now you can calculate how gram do you need from

number of mole = mass (g) / molecular weight for k2o

so => 1.1 = mass / 94

mass = 1.1 × 94 = 103.4 g

good luck

Answer:

Energy modelling can be described as a system to make simulations or computerized models of systems which use energy. This makes it easier to analyze and access such systems which use energy. By this approach, there are lesser chances for the energy to be wasted and fewer chances for any energy-related experiments to go wrong. As such kind of experiments can be dangerous hence it is essential that models be made first.

Answer:

Example A describes a physical change and Example B describes a chemical change.

Explanation:

Physical Change                                                                                              

The changes that occur only due to change in shape or physical properties but their chemical or internal composition remain unchanged.  

These changes were reversible.

They have same chemical property.

These changes can be observed with naked eye.

Example :

Vegetables are chopped and converted into smaller pieces the composition remain same. It is physical change.

Water converting to Ice

Water converting to gas

In this water molecule remain the same only they rearrange themselves that change its state of mater not composition

Chemical change:

The changes, that occur due to change in the composition of a substance and result in a different compound is known as chemical change.

These changes are irreversible

These changes occur due to chemical reactions

These may not be observed with naked eye

Example:

Combustion of fuel or wood: that oil or wood convert into energy, CO2 and ash in case of wood

Boiling of egg: that change the chemical composition of protein in the egg .

Food is broken up into simpler form during digestion and convert into the energy and particles which are different from original compound .

Answer:

Example A describes a physical change and Example B describes a chemical change.

Explanation:

Answer: the correct option is A.

Explanation:

Weight = Mass X Acceleration due to gravity(10m/s2)

If A has a mass of 4Kg and the mass of B is twice that of A. Then their weight will be :

For A:

W = 4 x 10 = 40N

For B:

Mas of B is two times that of A i.e

2 x 4 = 8kg

W = 8 x 10 = 80N

Comparing the weight of A and B it is clear that the weight of B is also twice the weight of A

Answer: When you burned the skewer tip coated with copper sulfate the green light is emitted

Explanation:

when the copper is burned it makes a green light

Answer:

only columns

Explanation:

All atoms of elements present in same group or column having same number of valance electrons. Thus the elements in same group having same properties.

For example:

Consider the second group. It consist of alkaline earth metals. There are six elements in second group. Beryllium, magnesium, calcium, strontium, barium and radium.

All have two valance electrons.

Electronic configuration of Beryllium:

Be = [He] 2s²

Electronic configuration of magnesium.

Mg = [Ne] 3s²

Electronic configuration of calcium.

Ca = [Ar] 4s²

Electronic configuration of strontium.

Sr = [Kr] 5s²

Electronic configuration of barium.

Ba = [Xe] 6s²

Electronic configuration of radium.

Ra = [ Rn] 7s²

They are present in group two and have same number of valance electrons (two valance electrons) and show similar reactivity.

They react with oxygen and form oxide.

2Ba   +   O₂   →    2BaO

2Mg  +   O₂   →    2MgO

2Ca +   O₂   →    2CaO

this oxide form hydroxide when react with water,

BaO  + H₂O   →  Ba(OH)₂

MgO  + H₂O   →  Mg(OH)₂

CaO  + H₂O   →  Ca(OH)₂

With sulfur,

Mg + S   →  MgS

Ca + S   →  CaS

Ba + S   →  BaS