What mass of steam at 100∘C must be mixed with 150g of ice at its melting point, in a thermally insulated container to produce water of 50∘C?

Answer:

mass in a given volume

Explanation:

Density is the mass in a given volume or mass per unit volume of a substance.

Mass is defined by the amount of matter present in a substance.

Volume is the space occupied by a body.

Mathematically;

                      Density  = \(\frac{mass}{volume}\)  

Balancing the equation :

KOH(aq) + HBr(aq) --> KBr(aq) + H2O(l)

This is the balanced chemical reaction because it follows the following ionic reaction:

H ^(aq)+ + Br^(aq)- + K^+(aq) + OH ^- (aq) → K^+(aq) + Br^-(aq) + H2O (l)

Answer:

The  pressure is \(P_f = 0.93 \ atm\)

Explanation:

From the question we are told that

   The  volume of  Ne  is  \(V_N = 2.50 \ L\)

    The volume  of  CO is  \(V_C = 2.00 \ L\)

    The  pressure of  \(Ne\) is  \(P_N = 1.09 \ atm\)

      The  pressure of  CO is \(P_C = 0.773 \ atm\)

The  number of  moles of  Ne present is evaluated using the ideal gas equation as

      \(n_N = \frac{P_N * V_N}{R T}\)

=>   \(n_N = \frac{1.09 * 2.50 }{R T} = \frac{2.725}{RT}\)

The  number of  moles of  CO present is evaluated using the ideal gas equation as

      \(n_N = \frac{P_C * V_C}{R T}\)

=>   \(n_N = \frac{0.73 * 2.00 }{R T} = \frac{1.46}{RT}\)

The  total number of moles of gas present is evaluated as

        \(n_T = n_N + n_C\)

        \(n_T = \frac{2.725}{RT} + \frac{1.46}{RT}\)

      \(n_T = \frac{4.185}{RT}\)

The  total volume of gas present when valve is opened is  mathematically represented as

                \(V_T = V_N + V_C\)

    =>        \(V_T = 2.50 + 2.00 = 4.50 \ L\)

So

  From the ideal gas equation the final pressure inside the system  is mathematically represented as

         \(P_f = \frac{n_T * RT }{ V_T}\)

=>      \(P_f = \frac{[\frac{4.185}{RT} ] * RT }{ 4.50}\)

=>       \(P_f = 0.93 \ atm\)

1.60 × 1020 molecules are initially present in a first order process. How many molecules are still unreacted in 80.0 minutes if the reaction does have a half-life equal 20.0 minutes? 2.468751 moles 1 two 3 4.

The duration it takes that half of the a radioactive atom's original population to decay is known as the half-life. The relationship between both the half-life, this time frame, t1/2, or even the decay constant, is t12=0.693 t 1 2 = 0.693. To make difficult concepts simpler, use simple images.

For any particular drug, understanding the idea of half-life is helpful in calculating steady-state concentrations and excretion rates. Although different medications have varied half-lives, they always adhere to the same principle: 50% of a initial drug dose is eliminated from the body after one half-life.

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Answer:

pH: 4.80617997398

pOH: 9.19382002602

[H+]: 1.5625E-05

[OH-]: 6.4E-10

ACID

Hope it helps :)

Answer:

C. When two substances are combined, but are not chemically

Explanation:

Compound is result of chemical combination of two or more than two substance. When substances chemically combine thier properties change.

When substance are mixed in such a way that they donot react with each other such combination results in mixture. In mixture their properties do not change.

The Elements can be ranked From Most Reactive To Least Reactive as;

as ;

The rate at which a chemical material conducts a chemical reaction over time is known as reactivity. During a chemical process, an element has a relative tendency to gain or lose an electron.

Reactivity in pure compounds is governed by the sample's physical characteristics. Reactivity is the catalyst that causes a chemical compound to react chemically, either on its own or with other substances, releasing energy overall.

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complete question;

Rank These Elements From Most Reactive To Least Reactive: Mg,Na,Rb,Ne

Answer:

Yttrium, Carbon, Iodine

Explanation:

Y stands for Yttrium

C stands for Carbon

I stands for Iodine

and 3 stands for 3 Iodine atoms

Answer:

B. 1s,2s,2p,3s

Explanation:

The majority of the lead(II) iodide in the solution precipitates out as a yellow solid flag.

Define lead iodide?

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Answer:

3.40x10¹⁰ grams

Explanation:

First we convert 5.25x10³² atoms to moles, using Avogadro's number:

5.25x10³² atoms ÷ 6.023x10²³ atoms/mol = 88.72x10⁸ mol

Then we convert K moles to grams, using its molar mass:

88.72x10⁸ mol * 39 g/mol = 3.40x10¹⁰ g

So 5.25x10³² atoms of K would weigh 3.40x10¹⁰ grams.

Answer:

C. volume

Explanation:

Explanation:

The substance that is in excess that doesn't get used up as a reactant is called limiting reactant.

Answer:

More than 30

Explanation:

There are more than More than 30 STDs

Gravity is a (n) force between objects and depends on an object's size and their distance apart.

Gravitational force is the attractive that exist between all object with mass an object with mass attracts another object with mass the magnitude of the force is directly proportional to the masses of the two objects and inversely proportional to the square of the distance between the two objects

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Aluminium is the metal which must release the most heat to experience a given decrease in temperature per gram of metal.

This is as a result of free electrons and is the ability of a substance to conduct heat.

Aluminium has the highest thermal conductivity in this case which is why it will release the most heat to experience a given decrease in temperature per gram of it.

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Answer:

they have major roles in the envoriment, Eastern grey squirrels are important predators of seeds and other animals in the ecosystems in which they live. Their seed-caching activities may help disperse tree seeds. They may help to distribute truffle fungal spores when they eat truffles.

hope that helps bby<3

Chlorine gas occupies a volume of 25 mL at 300 K, 46 ml volume will it occupy at 600 K.

Initial volume V₁ = 25 mL

Final volume V₂ = ?

Initial temperature T₁ = 300 K

Final temperature T₂ = 600 K

To find out the final volume we will use the following equation.

V₁/T₁ = V₂/T₂

Rearrange it for V₂

Final volume V₂ = V₁/T₁ × T₂

Final volume V₂ = 23 ml / 300 ml × 600 K

Final volume V₂ = 0.0767

Final volume V₂ = 46 ml

46 ml volume will it occupy at 600 K.

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The outermost electron in the ground state electron configuration of beryllium (Be) has the following quantum numbers:

These quantum numbers represent the energy, angular momentum, orientation, and spin of the electron, respectively.

Quantum numbers can be used to predict the possible location of an electron in an atom. These are four numbers that describe the different properties of electrons.

The four quantum numbers are described below:

Principal quantum number (n)-This quantum number defines the energy level at which an electron is present. It determines the distance from the nucleus of the atom that the electron is located. The smallest value of n is 1 and it increases as we move away from the nucleus.

Angular momentum quantum number (l)-The value of l ranges from 0 to n-1. It determines the shape of the orbital.

Magnetic quantum number (ml)-The possible values of ml are -l to +l. It specifies the orientation of the orbital in space.

Spin quantum number (ms)-The spin quantum number describes the spin orientation of the electron. It can have either of the two values, +1/2 or -1/2.

Be has four electrons in its ground state configuration, with two electrons in the 1s orbital and two electrons in the 2s orbital.

For the outermost electron in the 2s orbital, the values of the quantum numbers can be predicted n = 2 since the 2s orbital is in the second energy level. l = 0 for the s orbital. ml = 0 since there is only one s orbital in each energy level.ms = +1/2 or -1/2.

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Answer:

4Al + 3O2 → 2Al2O3

Explanation:

Answer:

The hollow ball is more buoyant than the solid ball.

Explanation:

The hollow ball will float while the solid ball sinks because the volume of water displaced by the hollow ball is more than that displaced by the solid ball.

An object floats when it displaces a volume of water equal to its weight.  A solid ball is more compact, and hence, does not displace a lot of water when dropped into a bowl full of water. On the other hand, the hollow ball will have a larger curved surface area, since it has no fill. This will make it displace a larger volume of water and hence make it float.

Answer:

The removal of one or more electrons from a neutral atom results in a cation.

Explanation:

When you remove electrons from a neutral atom, the atom becomes more positive. Electrons have a negative charge and the protons inside of the nucleus have a positive charge. When electrons are removed, the positive charges from the protons outweigh the negative charges. This results in a positively charged atom, called a cation.

Hello! :p .

deserts are known to have little to no rain fall & drop to very low temperatures at night! I hope this helps!

Answer: little or no rainfall

Explanation: Precipitation, sunlight, and temperature are all abiotic factors.

Deserts have a lack of rainfall.

Some deserts are hot, some deserts can be cold too.

Abiotic factors are  extreme temperatures of the day and night  the fast winds  the strong amount of sunlight  scarcity of water

wavelength = speed of light  ÷  frequency

wavelength =  (2.998 × 10⁸  m/s)  ÷ (1.41 x 10⁹  /s)

                     =   2.126  × 10⁻¹ m

Answer:

diabase maybe

Explanation:

Answer: quartzite, diabase and diamond.

The half-reaction Br\(_2\)(l) + 2\(e^-\) → 2\(Br^-\)(aq) is a reduction half-reaction, while the half-reaction Zn(s) → \(Zn^{2+}\)(aq) + 2\(e^-\) is an oxidation half-reaction.

The given half-reactions are:

Br\(_2\)(l) + 2\(e^-\) → 2\(Br^-\)(aq)

Zn(s) → \(Zn^{2+}\)(aq) + 2\(e^-\)

The oxidation and reduction reactions are defined as follows:

Oxidation reaction: A half-reaction that includes the loss of electrons is referred to as an oxidation reaction. The oxidation number of the species involved in the reaction is increased in this process.

Reduction reaction: A half-reaction that involves gaining electrons is referred to as a reduction reaction. The oxidation number of the species involved in the reaction is decreased in this process.

Now let us identify which half-reaction is oxidation and which is reduction:

Br\(_2\)(l) + 2\(e^-\) → 2\(Br^-\)(aq) (reduction reaction)

Zn(s) → \(Zn^{2+}\)(aq) + 2\(e^-\)(oxidation reaction)

Thus, the half-reaction Br\(_2\)(l) + 2\(e^-\) → 2\(Br^-\)(aq) is an example of a reduction half-reaction, while the half-reaction Zn(s) → \(Zn^{2+}\)(aq) + 2\(e^-\) is an example of an oxidation half-reaction.

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Answer:

Man-made radiation is generated in range of medical, commercial and industrial activities and natural occuring radiation occurs due to minerals.

Answer:

0.47m²

Explanation:

Given parameters:

Length = 9.025 x 10⁶m

Width  = 5.215 x 10⁻⁸m

Unknown:

Area of the rectangle  = ?

Solution:

Area is the derived from the product of the length and width of a body.

 Area  = length x width  = 9.025 x 10⁶m  x  5.215 x 10⁻⁸m

  Area  = 0.47m²

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

\(volume = \frac{mass}{density}\\\)

From the question

mass = 37.4 g

density = 0.017 g/L

We have

\(volume = \frac{37.4}{0.017} \\ = 2200\)

We have the final answer as

Hope this helps you