Which is a component of John Dalton’s atomic theory?
The ratio of atoms in a compound is fixed.
The atoms of different elements are the same.
An atom is a small particle of matter that can be broken down.
A reaction can create or destroy atoms as well as rearrange them.

If 100 s of heat is added to a system and 0.100 ks of work is done by the system, then the value of ΔE or DE (change in internal energy) is 200 J, which is in option A. This is as per the first rule of thermodynamics.

ΔE = Q - W

ΔE (change in internal energy)

Given that 100 J (joules) of heat is added to the system (Q = 100 J) and 0.100 kJ (kilojoules) of work is done by the system (W = -0.100 kJ), we need to ensure that the units are consistent.

Since 1 kJ = 1000 J, we can convert the work done to joules:

W = -0.100 kJ = -0.100 × 1000 J = -100 J

Now one can substitute the values into the equation:

ΔE = Q - W

= 100 J - (-100 J)

= 100 J + 100 J

= 200 J

Therefore, the value of ΔE (change in internal energy) is 200 J.

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complete question is below

if 100s of heat is added to a system and 0.100ks of work is done by the system, what is the value of DE​

A. 200 j

B.50 j

C.2 j

D. 10000j

Answer:

grams CaF₂ = grams Al₂(CO₃)₃ = 167.7 grams (4 sig. figs.)

Explanation:

                     3CaCO₃          +           2AlF₃            =>     3CaF₂   +   Al₂(CO₃)₃

Given:    214.5g/(100g/mol)      321.9g/(84g/mol) =>2.15 moles & 0.71 mole

                   = 2.15 mole               = 3.83 mole    =>       ?g CaF₂    ?g Al₂(CO₃)₃

ID of Limiting Reactant => divide mole values by respective coefficient & smaller value is the Limiting Reactant.

           CaCO₃ => (2.15/3) = 0.72  and    AlF₃ => (3.83/2) = 1.92

The value for CaCO₃ (=0.72)          <        the value for AlF₃ (=1.92)  => CaCO₃ is the Limiting Reactant

Note: When working problem using mole ratios, use mole value for Limiting Reactant and not the value used to determine Limiting Reactant, in this case 2.15 moles CaCO₃.

grams CaF₂ Produced:

moles CaF₂ produced = 3/3(2.15) moles CaF₂ = 2.15 moles CaF₂

grams CaF₂ produced = 2.15 moles CaF₂ x 78 g CaF₂ / mole CaF₂

= 167.7 grams CaF₂

grams Al₂(CO₃)₃ produced:

moles Al₂(CO₃)₃ produced = 1/3(2.15) moles Al₂(CO₃)₃ = 0.72 mole Al₂(CO₃)₃

grams Al₂(CO₃)₃ = 0.72  mole Al₂(CO₃)₃  x  234 g Al₂(CO₃)₃ / mole Al₂(CO₃)₃ = 167.7 grams  Al₂(CO₃)₃  

Answer:A Geiger counter is an instrument used for detecting and measuring ionizing radiation. Also known as a Geiger–Müller counter (or Geiger–Muller counter), it is widely used in applications such as radiation dosimetry, radiological protection, experimental physics, and the nuclear industry.

Answer:

Geiger counter

scintillation counter

dosimeter

film badge

detection of ionizing radiation

detection of radiation in the environment

determination of the concentration of radio isotopes in the body

film sensitive to radiation

Explanation:

on edg

Answer: D

Explanation:

i just took the ck-12 quiz and that was the right answer

Answer:

Calcium atom:
20 protons, 20 electrons
Calcium 2+ ion:
It is a calcium atom but with 2 fewer electrons, so
20 protons,  18 electrons
Oxygen atom:
8 protons and 8 electrons
Oxygen 2- ion:
It is an oxygen atom but with 2 more electrons, so
8 protons, 10 electrons
Calcium oxide:
Add protons and electrons of of Ca with O to get:
20 + 8 protons = 28 protons, 20 + 8 electrons: 28 electrons.
Alternatively, add protons and electrons of Ca{2+} and O{2-} to get the same result.

The correct number of protons and electrons of the given ions are as follows:

The number of protons and electrons in an atom or ion determines the overall charge of the ion or atom.

In a neutral atom, the number of protons and electrons are equal, hence, the overall charge of the atom is 0. However, in a charged atom (ion), the difference between the proton and electron number is the base.

It is important to note that the number of protons is the atomic number of an atom, hence, does not change. However, the number of electrons changes depending on whether electrons are gained or lost.

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3.0 mL is the volume of the ruby. The volume of a container is commonly believed to be its capacity.

Volume is a three-dimensional spatial measurement. It is frequently mathematically quantified using SI-derived units or different imperial or The us customary units. Volume is connected to the notion of length (cubed).

The volume of a container is commonly believed to be its capacity; that is, the quantity of fluid (gas or liquid) that perhaps the container can hold, instead of the amount of space that the container occupies.

volume of water = 4.1 mL

volume of water + the volume of the ruby gemstone = 7.1 mL

volume of the ruby gemstone can be calculated as:

7.1 mL - 4.1 mL = 3.0 mL

Therefore, 3.0 mL is the volume of the ruby.

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Increasing the pressure of a gas system increases the rate of reaction because it leads to an increase in the number of collisions between gas molecules. option D. It increases the rate of reaction because it increases the number of collisions.

Increasing the pressure of a gas system increases the rate of reaction because it leads to an increase in the number of collisions between gas molecules. As pressure increases, the gas molecules are compressed into a smaller volume, resulting in a higher concentration of molecules per unit volume. This higher concentration means that there are more gas molecules in a given space, leading to a greater frequency of collisions. According to the collision theory, for a reaction to occur, molecules must collide with sufficient energy and the correct orientation. By increasing the pressure, the molecules are brought closer together, increasing the likelihood of effective collisions. This, in turn, increases the rate of reaction. Therefore, increasing the pressure of a gas system increases the rate of reaction by increasing the number of collisions between gas molecules. Option D) is correct

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Answer:

Na ·

Explanation:

Hello!

In this case, since the Lewis dot structure of any element illustrates the number of valence electrons at the outer shell; we can set up the electron configuration of sodium to obtain:

\(Na^1^1\rightarrow 1s^2,2s^2,2p^6,3s^1\)

We can see there is only one valence electron, for that reason the Lewis dot structure is:

Na ·

Whereas the dot represents the valence electron.

Best regards!

A heat capacity minus A temperature loss equals B heat capacity minus B temperature gain 9.56 °C

Object A is hotter than Object B, and since they are in direct contact, heat can be conducted between them. The conservation of energy principle states that energy cannot be created or destroyed. The energy that item A expends in this situation can only be transferred to object B.

To calculate the amount of energy transmitted, multiply the heat capacity by the degrees of temperature increase or drop, assuming that the mass of both items is the same. Below is the calculation:

Energy acquired by B = Energy lost by A

A heat capacity minus A temperature loss equals B heat capacity minus B temperature gain.

\(4.37J/degree C * 6.3 C= 2.88 J * TbTb= \frac{(4.37 J/ degree C * 6.3 C) }{ 2.88J}Tb= 9.56 degree C\)

Therefore ,A heat capacity minus A temperature loss equals B heat capacity minus B temperature gain 9.56 °C

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Answer:

6.02 × 10²³ atoms Cl₂

Explanation:

Avagadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

Step 1: Define

1.00 mol Cl₂ (g)

Step 2: Use Dimensional Analysis

\(1.00 \hspace{3} mol \hspace{3} Cl_2(\frac{6.02(10)^23 \hspace{3} atoms \hspace{3} Cl_2}{1 \hspace{3} mol \hspace{3} Cl_2} )\) = 6.02 × 10²³ atoms Cl₂

Considering the phase diagram, the state of matter that exists in area B is gas.

The correct option is A.

A phase diagram is a graphical representation that shows the conditions of temperature and pressure at which different phases or states of a substance exist.

The axes of a phase diagram typically represent temperature (usually on the horizontal axis) and pressure (usually on the vertical axis). The diagram is divided into regions that correspond to different phases, and the lines separating these regions represent phase boundaries.

The point where three phase boundaries meet is known as the triple point, which represents the temperature and pressure at which all three phases can coexist in equilibrium.

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Answer:

Explanation:

I am assuming it is question 3

1 X 10^-4; 4; 1 x 10^-10, 10; acid

10^-6; 6; 1X10^-8; 8; acid

10^-9; 9; 10^-5; 5; base

10^-11; 11; 10^-3; 3; base

Answer:

Rb, Zn, P, S, F, Ca, Co, Cr

Rb, Zn, P, S, F, Ca, Co, Cr elements in order of decreasing metallic character.

The metallic character of an element is defined as the properties typical of metal, especially the tendency to lose electrons in chemical reactions.

Metallic character depends on the ability of an element to lose its outer valence electrons. Examples of properties related to metallic character include thermal and electrical conductivity, metallic lustre, hardness, ductility, and malleability. The most "metallic" element is francium, followed by caesium.

Hence, Rb, Zn, P, S, F, Ca, Co, and Cr elements in order of decreasing metallic character.

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Answer:

a.

Explanation:

One double bond.

For example ethene CH2=CH2

Lewis structures are diagrams that illustrate the bonding between atoms in a molecule as well as any lone pairs of electrons that may exist. They are also known as Lewis dot formulae, Lewis dot structures, electron dot structures, or Lewis electron dot structures.

Lewis structures, also known as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures, are diagrams that depict the bonding between atoms in a molecule as well as any lone pairs of electrons that may occur. Lewis structures are structural formulations that represent all valence electrons in molecules and polyatomic ions. Because valence electrons are often depicted as dots, these structural formulae are also known as Lewis dot structures.

Here,

Step 1: Count the number of valence electrons. Step 2: Draw the molecule's skeletal structure. Step 3: Form each link in the skeletal structure with two valence electrons. Step 4: Make an attempt to fulfill the atoms' octets by dispersing the leftover valence electrons as nonbonding electrons.

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The final concentration of the reactant of a first order reaction can be determined from the rate constant equation. The concentration of ammonium carbonate after 39 s will be 0.003 M.

Rate constant of a reaction is the rate of reaction when one molar concentration of the reactant is involved in the reaction. The expression for the rate constant k for first order reaction is :

k = 1/t ln (C0/Ct)

Where C0 be the initial concentration and Ct be the concentration after t seconds.

Given that C0 of ammonium nitrate = 0.957 M

rate constant = 0.196 /s

t = 39 s.

The concentration after 39 seconds is calculated as follows:

0.196 /s = 1/39s ln (0.957 M / Ct)

Ct = 0.957 / (ln⁻¹ (0.196 × 39))

    = 0.003 M.

Therefore, the concentration of ammonium carbonate after 39 seconds will be 0.003 M.

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Answer:

kci represents the formula of salt

KCl exists potassium chloride made of potassium and chloride. They are considered salt because they form K+ and Cl- ions, not OH- or H+ ions.

What is meant by chemical equation?

Chemical equations are symbolic depictions of chemical reactions in which the reactants and products are stated in terms of their corresponding chemical formulae.

Chemical equations, which are expressions that list the names and amounts of the chemicals involved in a process, are used to describe chemical reactions. The initial compound(s)—the reactants—and the final compound(s)—the products—are separated by an arrow in a chemical equation.

Therefore, the correct answer is option b) KCl.

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250 L of 5.0% w/v glucose solution can be prepared using 125 g of glucose.

w/v = [ mass of solute (g) / volume of solution (mL) ] × 100

5.0 % w/v = [ 125 g / volume of solution (mL) ] × 100

volume of solution (mL) = [ 125 g / 5.0 % w/v ] x 100

volume of solution (mL) = [ 125 g / (5.0 / 100) ] x 100

volume of solution (mL) = [ 125 g / 0.05 ] x 100

Answer:

Sodium has one valence electron. Valence electrons are electrons found in the outermost shell of an atom. The shell number representing the valence shell will differ depending on the atom in question. For sodium, which is in the 3rd row of the periodic table, the valence electrons will be found in the 3rd shell.

9.77 litres of NO2 are generated on average.

The balanced equation for the breakdown of N2O5 is as follows:

\(2N_2O_5(g) -- > 4NO_2(g) + O_2(g)\)

determine how many moles of N2O5 decompose:

\(V(N_2O_5) / Vm = n(N_2O_5)(N_2O_5)\)

where V(N2O5) = 4.86 dm3 is N2O5's volume and Vm(N2O5) is N2O5's molar volume under the circumstances stated in the ideal gas law:

\((R*T)/P = Vm = V/n\)

when the gas constant R is used.

the kelvin scale of temperature, T

The pressure is P.

The ideal gas law:

\(n(N_2O_5) = V(N2O5) / Vm(N_2O_5) = 4.86 dm3 / (24.46 L/mol) = 0.1982 mol\)

the number of moles of NO2 is:

\(n(NO_2 = 4/2 * n(N_2O_5) = 0.3964 mol\)

then,

\(n(NO_2 = 4/2 * n(N_2O_5) = 0.3964 mol\)

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Which chemical reaction is correctly balanced? *

a. CH4 +2O2 → CO2 +2H2O

b. 2CH4 +2O2 → CO2 +2H2O

c. CH4 +O2 → CO2 +H2O

d. None of the above

Explanation:

d none of the above

Answer:

The answer is a. CH4 + 2O2 --- CO2 + 2H2O

Explanation:

A balanced chemical reaction must have the same number of each type of atom on both sides according to the law of conservation of mass:

1 carbon 4 hydrogen + 4 oxygen ----- 1 carbon 2 oxygen + 4 hydrogen

2 oxygen  =

1 carbon 4 hydrogen 4 oxygen ---- 1 carbon 4 hydrogen 4 oxygen

Since each type of atom has the same amount on both sides, the chemical formula is balanced.

It is likely that the temperature of the steam is higher than the temperature of the water boiling in the kettle. The intense heat felt by Alka from the puff of steam supports this observation.

In general, the temperature of steam produced from boiling water is higher than the temperature of the water itself. When water boils, it undergoes a phase change from a liquid to a gas, forming steam.

During this phase change, the water absorbs heat energy from the heat source, such as a stove or electric kettle, and converts it into the latent heat of vaporization.

The boiling point of water is 100 degrees Celsius (212 degrees Fahrenheit) at standard atmospheric pressure. At this temperature, the water molecules have enough energy to overcome the intermolecular forces and transition into the gaseous state.

However, steam is hotter than the boiling point of water because it contains additional heat energy in the form of latent heat. The heat energy absorbed during vaporization is stored as latent heat within the steam. As the steam gushes out of the spout of the kettle, it releases this latent heat energy, which can be felt as intense heat.

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The question is incomplete; the complete question is;

Which of the following statements is/are true for a 0.10 M solution of a weak acid HA?

a. [ H+] >> [ A−]

b. [ H+] = [ A−]

c. The pH is 1.00.

d. The pH is less than 1.00.

Answer:

b. [ H+] = [ A−]

Explanation:

Given the acid as HA, we know that being a weak acid, its dissociation in water can never be 100%. If it were a strong acid, then it could have undergone a 100% dissociation in solution. The conjugate base of a weak acid is a always a weak base hence A^- is expected to act as a weak base. At the same concentration, weak acids have a higher pH value than strong acids. Hence if the pH of a strong acid HA is 1, then the pH of a weak acid HA must be greater than 1.

But, we look at the equation for the dissociation of the weak acid HA

HA(aq)⇄H^-(aq) + A^-(aq). This implies that the HA dissociates in a 1:1 ratio therefore; [H+] = [ A−], hence the answer given above.

Answer:

I'd say maybe Dangerous? I hope this helps

Answer:

golden is sometimes referred to as shiny and beatitful

Explanation:

Answer:

24.31 g/mol.

Explanation:

moles =mass/molar mass

n=w/m

Answer:

Lead iodide (II) is an inorganic compound, lead salt and hydrogen acid, with the PbI2 formula.

Answer: 67.5

Explanation:

Brainliest pls

Answer:

Plates

Explanation:

for example when 2 plates rub together that creates an earthquake a tsunami or even a mountain