Which subatomic particle of an atom moves around nucleus

Answer:

 .24 mg

Explanation:

The mineral contains .016 % silicon

mass of the mineral = 1.5 kg

mass of silicon = 1.5 x .016 %

= 1.5 x .016 / 100

= 24 x 10⁻⁵ kg

= 24 x 10⁻² mg

= .24 mg .

Answer:

17 kJ

Explanation:

Calculation for the Calculate the energy required to heat 0.60kg of ethanol from 2.2°C to 13.7°C.

Using this formula

q = mC∆T

Where,

q represent Energy

m represent Mass of substance=0.60kg=600g

C represent Specific heat capacity=2.44J·g−1K−1.

∆T represent change in Temperature=2.2°C to 13.7°C.

Let plug in the formula

q=(0.60 kg x 1000 g/kg)(2.44 J/gº)(13.7°C-2.2°C)

q = (600g)(2.44 J/gº)(11.5º)

q=16.836 kJ

q= 17 kJ (Approximately)

Therefore the energy required to heat 0.60kg of ethanol from 2.2°C to 13.7°C will be 17 kJ

Answer: The answer is TiCl4 + 2H2O --> TiO2 + 4HCl

Explanation: Every element is equal on both sides.

Ti- 1   Ti-1

Cl- 4   Cl-4

H- 4   H-4

O- 2   O-2

Answer: With the cold front, warm air is rapidly forced upward (like the shavings) in advance of the actual front (the “cutter”), creating towering cumulus clouds, some hard showers and quite possibly a few gusty thunderstorms followed by a push of cooler and drier air in its wake.

Explanation:

Answer:

Chemical reaction often involved changes energy due to the breaking and formation of bonds. Reaction in which energy is released are exothermic reaction,while those that take in heat energy are endothermic.

Answer: Entropy.

Explanation:

If we recall the laws of thermodynamics, there is a state function called entropy, that is related to the disorder in the system.

Such that, for example, in a gas expansion, we will have an increase in the "disorder" then we will have an increase in the entropy, this happens because we have more volume where the particles can be, then we have a larger number of "microstates" (or microscopic states, which refers to the states of the particles that conform the gas)

Particularly, when we go into statistical thermodynamics, there is something called the "Statistical entropy" that is related to the information theory, where the entropy depends on the number of possible outcomes that some event, like a chemical reaction, can have.

For a larger number of possible outcomes, we will have a larger entropy (we can think of this larger number of possible options as a disorder) and this entropy will be related to the statistical probability of each one of those outcomes.

Where the (most general) equation for the entropy is:

S = Kb*Σpₙ*ln(pₙ)

Where pₙ is the probability for the n-th outcome.

Kb is Boltzman's constant.

Answer:

The correct answer choices are B and D.

Explanation:

A volcanic eruption happens when magma reaches the surface of the earth.  Depending on the amount of gas and the silica content of the magma, the lava and the type of eruption can vary.  Silica, which forms from the elements silicon and oxygen, makes the lava thicker and less runny. When lava is thick, the volcanic eruption tends to be more explosive.  The amount of silica also changes the color and density of the lava, which then makes different kinds of igneous rocks.  As the gas content of the lava goes up, the eruption becomes more explosive.  

Answer:

[tex]^{31}_{15}P[/tex] is the isotopic notation of the atom

Explanation:

The isotope notation is:

[tex]^a_bX[/tex]

Where a is the mass number = Number of protons + Number of neutrons

b is atomic number = Number of protons

The atomic number define the nature of the atom, the element with atomic number = 15 is phosphorus, P:

[tex]^a_bP[/tex]

a = 15 protons + 16 neutrons = 31

b = 15

[tex]^{31}_{15}P[/tex] is the isotopic notation of the atom.

Answer:

A

Explanation:

My reason is color change is an example

Mixing reactants is a chemical change clue

formation of precipitate is a clue

so that leaves A

Answer:

Find alternatives to fossil fuels

Explanation:

The most effective long - term solution to reduce the amount of carbon dioxide emission is to find alternatives to fossil fuels.

Fossil fuels consumption and use in most industrial processes are some of the leading causes of huge carbon signatures in the atmosphere.

Answer:

The volume that the same gas will occupy at 101.3 kPa if the temperature is kept constant is 5.27 L.

Explanation:

As the volume increases, the particles (atoms or molecules) of the gas take longer to reach the walls of the container and therefore collide with them less times per unit of time. This means that the pressure will be lower because it represents the frequency of collisions of the gas against the walls. In this way pressure and volume are related, determining Boyle's law that says:

"The volume occupied by a given gaseous mass at constant temperature is inversely proportional to pressure"

Boyle's law is expressed mathematically as:

P * V = k

Now it is possible to assume that you have a certain volume of gas V1 that is at a pressure P1 at the beginning of the experiment. If you vary the volume of gas to a new value V2, then the pressure will change to P2, and it will be fulfilled:

P1 * V1 = P2 * V2

In this case, you have:

Replacing:

92 kPa* 5.80 L= 101.3 kPa* V2

and solving, you get:

[tex]V2=\frac{92 kPa* 5.80 L}{101.3 kPa}[/tex]

V2= 5.27 L

The volume that the same gas will occupy at 101.3 kPa if the temperature is kept constant is 5.27 L.

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

volume = final volume of water - initial volume of water

volume = 260.5 - 242 = 18.5 mL

We have

[tex]density = \frac{194.3}{18.5} \\ = 10.5027[/tex]

We have the final answer as

Hope this helps you

Answer: The empirical formula is [tex]C_3H_6O[/tex]

Explanation:

If percentage are given then we are taking total mass is 100 grams. So, the mass of each element is equal to the percentage given.

Mass of C = 62.04 g

Mass of H = 10.43

Mass of O = (100-(62.04+10.43)) g  = 27.53 g

Step 1 : convert given masses into moles.

Moles of C = [tex]\frac{\text{ given mass of C}}{\text{ molar mass of C}}= \frac{62.04g}{12g/mole}=5.17[/tex]moles

Moles of H =[tex]\frac{\text{ given mass of H}}{\text{ molar mass of H}}= \frac{10.43g}{1g/mole}=10.43moles[/tex]

Moles of O = [tex]\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{27.53g}{16g/mole}=1.72moles[/tex]

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For C = [tex]\frac{5.17}{1.72}=3[/tex]

For H =  [tex]\frac{10.43}{1.72}=6[/tex]

For O =[tex]\frac{1.72}{1.72}=1[/tex]

The ratio of C :H :  O= 3: 6 : 1

Hence the empirical formula is [tex]C_3H_6O[/tex]

Answer:

Love is not only the thing in this world!

Study hard, you can choose a better way of life.

Answer: lighter atoms

energy

neutrons

Explanation:

A nuclear fission is simply defined as a nuclear reaction whereby the nucleus of an atom is being divided into smaller nuclei which are also lighter. An energy is also released when this occurs.

Therefore, the products of a fission include lighter atoms, energy and neutrons.

Answer:

lighter atoms

energy

neutrons

Explanation: took test

Answer: the destruction of the butterflies’ environment

Explanation:

A mutation that would result in darker wings will mean that the birds that prey on them will stop eating a lot of them so this won't lead to extinction.

A decrease in the birds that eat the butterflies will also mean that the butterflies will survive more because they will have less predators.

Overproduction of butterfly offspring means more butterflies so they will not go extinct.

If their habitat was destroyed however, the butterflies might find it hard to survive as any new environment they go to might not be suitable leading to their extinction.

Answer:

I believe it is c

Explanation:

1x+cb=23

thios  is right because math

Answer:

See explanation

Explanation:

Chlorine has three shells. We know that the first shell contains two electrons, the other shell has eight electrons while the last shell has seven electrons. This means that chlorine has seventeen electrons.

For sodium, there are also three shells. The first shell has two electrons as usual. The next shell has eight electrons while the last shell has only one electron. This makes a total of eleven electrons for sodium.

Answer: sodium-11

chlorine-17

Explanation: meow

Answer:

57.6 KJ/mol

Explanation:

We have that;

T1 = 301 K

T2= 311 K

k1 = k1

k2= 2k1

R = 8.314 JK-1

Ea= ?

So;

ln(k1/k2) = (-Ea/R) (1/T1 - 1/T2)

ln (k1/2k1) = -(Ea/8.314) (1/301 - 1/311)

ln(1/2) = -(Ea/8.314) (3.3 * 10^-3 - 3.2 * 10^-3)

-0.693 = -(Ea/8.314) 0.1 * 10^-3

-0.693/ 0.1  * 10^-3 = -(Ea/8.314)

-6930 =  -(Ea/8.314)

Ea = 6930 * 8.314

Ea = 57.6 KJ/mol

Answer:

the first one

Explanation:

Answer:

a penny that has turned green

Explanation:

a chemical change is when a substance combines with another to form a new substance. the other answer choices doesn't form a new substance.

Answer: 3 molecules of carbon dioxide and 4 molecules of water are produced during the combustion of propane.

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

The balanced chemical reaction for combustion of propane is:

[tex]C_3H_8+5O_2\rightarrow 3CO_2+4H_2O[/tex]

3 molecules of carbon dioxide and 4 molecules of water are produced during the combustion of propane.

Answer:

Mass = 8.5 g

Explanation:

Given data:

Mass of ammonia = ?

Number of moles = 0.5 mol

Solution:

Formula:

Mass = number of moles × molar mass

Molar mass of ammonia = 17 g/mol

By putting values,

Mass = 0.5 mol × 17 g/mol

Mass = 8.5 g

Answer:

The new class of compound formed is an alcohol.

Explanation:

The treatment of an alkene with Hg(OAc)₂ in alcohol followed by reaction with NaBH₄ gives an alcohol. This reaction is known as oxymercuration-demercuration reaction. It is a two-step pathway which proceeds in the Markovnikov manner. In this reaction, the alkene react with the Mercury salt (Hg(OAc)₂) and a nucleophile (alcohol) to form an organomercury intermediate. The intermediate's carbon-mercury bond is then converted to carbon-hydrogen bond by the reaction with NaBH₄. An alcohol is then produced.

Answer:

pH = 12.22

Explanation:

... To make up 170mL of solution... The temperature is 25°C...

The dissolution of Barium Hydroxide, Ba(OH)₂ occurs as follows:

Ba(OH)₂ ⇄ Ba²⁺(aq) + 2OH⁻(aq)

Where 1 mole of barium hydroxide produce 2 moles of hydroxide ion.

To solve this question we need to convert mass of the hydroxide to moles with its molar mass. Twice these moles are moles of hydroxide ion (Based on the chemical equation). With moles of OH⁻ and the volume we can find [OH⁻] and [H⁺] using Kw. As pH = -log[H⁺], we can solve this problem:

Moles Ba(OH)₂ molar mass: 171.34g/mol

0.240g * (1mol / 171.34g) = 1.4x10⁻³ moles * 2 =

2.80x10⁻³ moles of OH⁻

Molarity [OH⁻] and [H⁺]

2.80x10⁻³ moles of OH⁻ / 0.170L = 0.01648M

As Kw at 25°C is 1x10⁻¹⁴:

Kw = 1x10⁻¹⁴ = [OH⁻] [H⁺]

[H⁺] = Kw / [OH⁻] = 1x10⁻¹⁴/0.01648M = 6.068x10⁻¹³M

pH:

pH = -log [H⁺]

pH = -log [6.068x10⁻¹³M]

Answer:

the first one

Explanation:

Answer:

12.01% by mass

Explanation:

Percent by mass is 100 times the mass of solute (ammonia) over the mass of the solution. In molarity, we have the moles of ammonia per liter of solution. There are 6.70moles of NH3 in 1L. Thus, we need to convert the moles of ammonia to grams and the liters of solution to grams:

Mass ammonia - Molar mass: 17.031g/mol-

6.70moles * (17.031g / mol) = 114.1g NH₃

Mass solution:

1L * (1000mL / 1L) = 1000mL * (0.950g/mL) = 950g

Percent by mass:

114.1g NH₃ / 950g * 100 =