Select the correct answer.

In which reaction is precipitation occurring?

A.
MgCl2(aq) + CuSO4(aq) → CuCl2(aq) + MgSO4(aq)
B.
CdSO4(aq) + K2S(aq) → CdS(s) + K2SO4(aq)
C.
NaOH(aq) + NH4Cl(aq) → NaCl(aq) + NH4OH(aq)
D.
K2SO4(aq) + NaOH(aq) → K2OH(aq) + NaSO4(aq)
E.
HNO3(aq) + KOH(aq) → KNO3(aq) + H2O(l)

Choose the products that complete the reaction. The chemical equation may not be balanced.

NaHCO3 + HC2H3O2

Answer: NaC2H3O2 + CO2 + H2O

Answer:

1.023 J / g °C

Explanation:

m = 37.9 grams

ΔT = 25.0*C

H = 969 J

c = ?

The equation relating these equation is;

H = mcΔT

making c subject of formulae;

c = H / mΔT

c = 969 J / (37.9 g * 25.0*C)

Upon solving;

c = 1.023 J / g °C

Answer:

Decomposition

Explanation:

This shows a compound splitting into two

By definition, PbSO₄ → PbSO₃ + O₂ is a decomposition reaction, because a single substance decomposes producing two different substances.

First, you have to know that in a decomposition reaction, a single substance decomposes, producing two or more different substances. That is, in this type of reaction, two or more substances are formed from a compound.

The atoms that make up a compound are separated to give the products according to the formula:

AB → A + B

This type of reaction can occur spontaneously or caused by certain external factors, such as heat, which promote the decomposition of the molecule into simpler substances.

In this case, it is possible to observe that PbSO₄ → PbSO₃ + O₂ is a decomposition reaction, because a single substance decomposes producing two different substances.

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Answer:

B

Explanation:

Decreasing the sample size of the liquid

hope it helps!

Considering the definition of percentage by mass, the correct answer is option D. the percent composition of carbon dioxide is 6.6%

The percentage by mass expresses the concentration and indicates the amount of mass of solute present in 100 grams of solution.

In other words, the percentage by mass of a component of the solution is defined as the ratio of the mass of the solute to the mass of the solution, expressed as a percentage.

The percentage by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage. This is:

[tex]percentage by mass=\frac{mass of solute}{mass of solution} x100[/tex]

In this case, you know:

Replacing in the definition of percentage by mass:

[tex]percentage by mass=\frac{13.203 grams}{200 grams} x100[/tex]

Solving:

percentage by mass= 6.60 %

Finally, the correct answer is option D. the percent composition of carbon dioxide is 6.6%

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Answer:

[SO2Cl2] = = 0.015 M [SO2] = = 0.0027 M [Cl2] = = 0.0027 M Q = =   = 4.8 × 10−4

No. Q < Kc, so reaction will shift to the right.

Explanation:

Answer:The 1st Quarter Moon is a primary Moon phase when we can see exactly half of the Moon's surface lit up. ... The First Quarter Moon rises around midday and is visible in the day sky. ... when the Moon has reached the first quarter of its orbit around Earth, hence the name. ... Full Moon Names · Taking pictures of the Moon.

Explanation:

Answer:

c. (NH4)3PO4

Explanation:

Answer:

c is the right answer

Explanation:

as we know ammonium is NH4

AND PHOSPHATE IS PO4-3

SO WHEN WE MIX THEM THEY BECOME

(NH4)3PO4

Answer:

It looks right to me make sure you have sig figs if the question asked for it though so you smalles figure would be 3 so with sig figs your answer would be 1190cm3

Answer:

-400.3 kJ/mol

Explanation:

Answer

The elements in increasing order of atomic radius: oxygen, carbon, aluminum, potassium

Explanation:

The distance from the center of the nucleus to the outermost shell of the electron is known as the atomic radius of an element. The atomic radius decreases rightward along each period (row) of the table due to the increase in effective nuclear charge (the charge of the nucleus equal to the number of protons). Across a period, electrons are added to the same energy level and the increasing number of protons causes the nucleus to exert more pull on these electrons, which makes the atomic radius smaller.  Atomic radius increases down each group (column) of the periodic table because of the addition of electrons to higher energy levels, which are further away from the nucleus and the pull of nucleus weakens. Another reason for the increase in atomic radius is the electron shielding effect, which is the reduction of the attractive force between a nucleus and its outer electrons due to the blocking effect of inner electrons

While moving from left to right in the second period, c arbon comes before  oxygen  and so oxygen will have a smaller atomic radius than  carbon. While moving down the periodic table, al uminum comes before  potassium even if they are not in the same period. So aluminum 's atomic radius will be smaller than that of  potassium  but bigger than that of  carbon  and  oxygen.

(hope that helps can i plz have brainlist it will make my day :D hehe)

Answer:

I'm not to sure I'll ask one of my frens to help

Answer: The molecular formula will be [tex]C_3H_9[/tex]

Explanation:

Molecular formula is the chemical formula which depicts the actual number of atoms of each element present in the compound.  

Empirical formula is the simplest chemical formula which depicts the whole number of atoms of each element present in the compound.  

The empirical formula is [tex]CH_3[/tex]

The empirical weight of [tex]CH_3[/tex] = 1(12)+3(1)= 15g.

The molecular weight = 45.0 g/mole

Now we have to calculate the molecular formula:

[tex]n=\frac{\text{Molecular weight }}{\text{Equivalent weight}}=\frac{45}{15}=3[/tex]

The molecular formula will be=[tex]3\times CH_3=C_3H_9[/tex]

Thus molecular formula will be [tex]C_3H_9[/tex]

Answer:

Diffusion helps cells maintain homeostasis by allowing ions to move across the cell membrane to maintaing both the voltage across the membrane and the ion concentrations.

Diffusion helps in maintaining homeostasis by allowing movement of ions in and out across the cell.

Diffusion is defined as the process of movement of molecules which takes place under concentration gradient. It helps in movement of substances in and out from the cell.The molecules move from lower concentration region to a higher concentration region till the concentration becomes equal.

There are 2 main types of diffusion:

1) simple diffusion-process in which substances move through a semi-permeable membrane without the aid of transport proteins.

2) facilitated diffusion- It is a passive  movement of molecules across cell  membrane  from higher concentration region to lower concentration.

There are 2 types of facilitated diffusion one is osmosis and dialysis.

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Answer: Ionic bonds form only between metals and nonmetals. That's because metals “want” to give up electrons, and nonmetals “want” to gain electrons. It takes energy to remove valence electrons from an atom and form a positive ion. Energy is released when an atom gains valence electrons and forms a negative ion

Answer:

i think its changing shape if I'm wrong I'm sorry

Answer:

ok horita te ayudo ok esperame okey bueno

George W. Bush lol nvm just trolling.

Correct answer is Alquaida flew with 2 airplanes into the twin towers at the 11. September 2001

Answer:

gain2 electrons

Explanation:

that the answer to that question

Answer: self-actualization (C)

Explanation:

it’s at the top of the hierarchy of needs.

1. In preparing his speech for a youth association, Eric considers the demographics and other important information about the people who will be listening to him speak. Like all successful speakers, Eric is engaging in the process of

C. Analyzing the audience

2. To gather formal information about audience members' attitudes, beliefs, and values, you can

D. ask open-ended and closed ended question on a survey

3. Debbie planned a speech calling for higher student fees. She thought about how her audience might react to this message. She prepared a survey and asked a group of her classmates to take it. What kind of audience analysis did Debbie use?

C. Formal

4. Why is audience analysis important?

A. It helps you understand the audience as much as possible before giving your speech

5. The audience's educational level is a factor related to

B. demographics

6. A speaker that collects information about the audience, evaluates what has been collected, and adapts his or her speech using that information is considered a(n) _____ speaker

B. Audience-centered

7. Maslow refers to the stage where one reaches his or her full developmental potential as

C. self-actualization

8. Which of the following is a method of collecting informal data about your audience?
D. observing the audience

9. Sara is preparing a speech to endorse a political candidate. She uses the information she gathered about her audience to determine their vales, beliefs, and attitudes so she can better prepare her speech. Sara is conducting which type of analysis?

A. Psychographic analysis

10. As you learn more about the audience, you are able to identify the beliefs, values, and attitudes of the audience. This is known as

B. Psychographics

I hope this helps!

Answer:

um

Explanation:

help you? you mean do it for you? nah man you can just use the calculator ;)

119 so a I think that's Is me anser

The volume of space it takes up, whereas its mass is the amount of matter it contains. A sample's density is the quantity of mass per unit of volume.

[tex]HClO_4 +NaOH \longrightarrow NaClO_4 + H_2O\\\\[/tex]

HClO₄ is a monoprotic strong acid.

1 mol of HClO₄ reacts with 1 mol of NaOH for neutralization.

Calculating the moles of NaOH [tex]= (0.0789\ M) \times (0.050\ L) = 0.003945\ mol[/tex]

Calculating the needed moles in HClO₄ [tex]= 0.003945 \ mol[/tex]

Calculating the HClO₄ Molarity that is 0.188 M

Calculating the HClO₄ volume that is needed [tex]= \frac{(0.003945\ mol) }{ (0.188\ M)} = 0.020\ L[/tex]

Therefore, the volume of HClO₄ that is needed = 20 mL

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Answer:

Fertilisers

And also organic compounds

Answer:

91.4

Explanation:

Givens

d = 8.96

v = 10.2 cm^3

m =?

Formula

d = m / V

Solution

8.96 = m / 10.2               Multiply both sides by 10.2

8.96 * 10.2 = m

m = 91.392 grams

m = 91.4 grams rounded.

Answer:

The new temperature will be 204.4 K

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 which says:

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

Boyle's law is expressed mathematically as:

Pressure * Volume = constant

or P * V = k

Charles's Law consists of the relationship between the volume and the temperature of a certain quantity of ideal gas, which is kept at a constant pressure, by means of a constant of proportionality that is applied directly. For a given sum of gas at a constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases because the temperature is directly related to the energy of the movement of the gas molecules. .

In summary, Charles's law is a law that says that when the amount of gas and pressure are kept constant, the ratio between the volume and the temperature will always have the same value:

[tex]\frac{V}{T} =k[/tex]

Finally, Gay-Lussac's law can be expressed mathematically as follows:

[tex]\frac{P}{T} =k[/tex]

This law indicates that the quotient between pressure and temperature is constant.

This law indicates that, as long as the volume of the container containing the gas is constant, as the temperature increases, the molecules of the gas move faster. Then the number of collisions against the walls increases, that is, the pressure increases. That is, the pressure of the gas is directly proportional to its temperature.

Combined law equation is the combination of three gas laws called Boyle's, Charlie's and Gay-Lusac's law:

[tex]\frac{P*V}{T} =k[/tex]

You want to study two different states, an initial state and a final state. It will happen:

[tex]\frac{P1*V1}{T1} =\frac{P2*V2}{T2}[/tex]

In this case:

Replacing:

[tex]\frac{100 kPa*150 mL}{292 K} =\frac{105 kPa*100 mL}{T2}[/tex]

Solving:

[tex]T2=105 kPa*100 mL*\frac{292 K}{100 kPa*150 mL}[/tex]

T2= 204.4 K

The new temperature will be 204.4 K

Answer:

THe atomic number of an element is the same number of protons and electrons the element has.

Explanation:

The atomic number is the number of protons that is equal to the of electrons. Also, the mass numbers can be used for the number of neutrons. So the isotope of the element and its valency can be determined by the atomic number and mass number.

Because they are calculated by counting whole items, the atomic b and mass number are always whole values (protons, neutrons, and electrons). The total number of subatomic particles found in an atom is equal to the sum of the mass number and atomic number for an atom (A-Z). The mass number indicates, in atomic mass units, the mass of the atom's nucleus (amu).

The amount of protons each element has determined its atomic number, which is used to distinguish one element from another. The total number of protons and neutrons in an element determines its mass number.

All of the elements in the contemporary periodic table have rising atomic numbers, and as a result, increasing mass numbers. As you are aware, an atom is made up of protons, neutrons, and electrons.

We can determine an atom's valency by counting the number of electrons in its outermost shell. Similar to this, the atomic number and mass number of the atom are related to the number of protons and neutrons.

Therefore, the knowledge of the atomic number and mass number can help in determining the valency and isotope of the element.

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