define average speed velocity​

Answer:

It emits hydrogen sulfide...smells like rotten eggs..

ty:)pls let me know whether this is ryt:D

Answer:

Hey!

Your answer is that it creates hydrogen sulfide gas / liquid...

Which really smells...

Explanation:

HOPE THIS HELPS!

Answer:

it is Ph of solution that tells you the acdic and basic nature of solution

if PH is lower than 7 the soution is acidic and if PH is larger than 7  the solution is basic

Explanation:

Answer:

A. Ph

Explanation:

Answer:

112mL

Explanation:

We'll begin by calculating the number of mole in 0.640g of SO2.

This is illustrated below:

Molar mass of SO2 = 32 + (16x2) = 64g/mol

Mass of SO2 = 0.640g

Number of mole of SO2 =.?

Mole = mass /molar mass

Number of mole of SO2 = 0.640/64

Number of mole of SO2 = 0.01 mole

Next, we shall determine the number of mole of O2 required for the reaction. This is illustrated below:

2SO2(g) + O2(g) —> 2SO3(g)

From the balanced equation above,

2 moles of SO2 reacted with 1 mole of O2.

Therefore, 0.01 mole of SO2 will react with = (0.01 x 1)/2 = 0.005 mole of O2.

Therefore, 0.005 mole of O2 is required for the reaction.

Finally, we shall determine the volume of O2 required for the reaction as follow:

Note: 1 mole of a gas occupy 22.4L (22400mL) at stp.

1 mole of O2 occupy 22400mL at stp.

Therefore, 0.005 mole of O2 will occupy = 0.005 x 22400 = 112mL

Therefore, 112mL of O2 is required for the reaction.

Answer:

the answer is C

Explanation:

i did the test on edg and got it right

Answer:

artificial polymer fibers that melt upon heating

Explanation:

Answer:

B - Poor crop production

Explanation:

I just did the quiz on Edge 2021

Answer:

b

Explanation:

Answer:

The entropy of this reaction (ΔS) = -187.9 J/K

Explanation:

.Step : Data given

ΔS = -187.9 J/K

ΔH = -198.4 kJ

T = 297.0 K

Step 2: The balanced equation

2SO2(g) + O2(g) → 2SO3(g)

Step 3: Calculate the entropy

ΔG = ΔH - TΔS

⇒ΔG = the gibbs free energy

⇒ΔH = the change in enthalpy of the reaction = -198.4 kJ

⇒with T = the temperature = 297.0 K

⇒with ΔS = the change of entropy =  -187.9 J/K

ΔG = -198400 kJ -297*(-187.9kJ/mol)

ΔG = -198400+55806.3

ΔG = - 142593.7 kJ = the gibbs free energy

The entropy of this reaction (ΔS) = -187.9 J/K

Answer:

C. -187.9 J/K

Explanation:

Entropy is just ΔS, which it gives you in the question as -187.9 J/K.

Answer:

Na3P is Sodium phosphide

Na3PO4 is sodium phosphate

Explanation:

Na3P is a combination of the element sodium

and the element phosphorus.

When writing the chemical formula of compounds , we have to take into consideration the valencies or combining powers of the individual parties, whether single elements or radicals

Under general terms, the valency of sodium is -+1 and its combining form can be written as Na+. While in the case of phosphorus, its own is -3 and its form is P3-.

Now, to write the chemical formula, there has to be an exchange of valencies by the two elements in question. That is why finally, sodium took 3 and phosphorus took 1 and we have Na3P.

Now, for the name phosphide, phosphides are binary compounds that contain phosphorus and a metal . When we talk of binary compounds, we mean compounds that have two elements only. So because sodium is a metal, we have to give the name phosphide to the compound.

Na3PO4

Referencing the explanation made above, but this is a bit different. We have sodium coming in contact with a radical here. The combination it is making here is with the phosphate ion (PO4)3-.

So as usual, there is an exchange of valency and thus sodium takes the 3, while the whole phosphate group take 1. So therefore, the name of the compound is gotten from the combination of the individual parties and it is called sodium phosphate.

Answer:

acid rain

Explanation:

When sulfur dioxide combines with water and air, it forms sulfuric acid, which is the main component of acid rain. Acid rain can: cause deforestation.

Answer:

37.1g of Ca

Explanation:

Hello,

Molecular formula for calcium chloride = CaCl

Molar mass = 40 + 35.5 = 75.5g/mol

Assuming there's one mole of CaCl

1 mole = mass / molar mass

Mass = 1 × 75.5

Mass = 75.5g

75.5g of CaCl contains 40g of Calcium

70g of CaCl will contain x g of Calcium

X = (70 × 40) / 75.5

X = 37.086g

Therefore, 70g of CaCl contains approximately 37.1g of Ca

Answer:

this is the answer

Explanation:

If someone tells Atomic mass of oxygen is 16, then it means that One the mass of an atom of a oxygen expressed in atomic mass units is 16 It is approximately equivalent to the number of protons and neutrons in the atom of oxygen (the mass number) or to the average number allowing for the relative abundances of different isotopes of oxygen.

Atomic mass Of oxygen is 15.99u or 15.99 amu.

And the mass no. Of oxygen is 16 because total no. Of protons and neutrons (in oxygen 16) is 16.

8 protons+ 8neutrons

So we can say that mass no. And atomic mass are different things.

Then, the atomic mass of oxygen is not 16 rather 15.99amu or 15.99u

Answer: Water, alcohols, aldehydes, and ketones.

Explanation:

Answer:

Examples of Partially Miscible and Immiscible Liquids: Illustrations of immiscible liquids are cooking oil and water, milk and oil, gasoline and water, and liquid metals and water. There are as well partially miscible liquids such as honey and water, butanol and water, and potassium chloride and water.

Explanation:

Hope it helps

Answer:

Perigee

Explanation:

In Perigee, The moon appears closer.

Answer:

2 atm

Explanation:

Different symbols have different meanings in chemistry. For example, the symbol Δ = adding energy to the reactants.

To identify whether the reactants combine with a specific pressure, we have to use the symbol atm, in such a case 2 atm.

Hope that helps!

Answer:

alkali metals hydrogen lithium sodium potassium rubidium cesium francium alkaline earth metals beryllium magnesium calcium strontium barium radium group 3 boron aluminium gallium indium thalium carbon family carbon silicon germanium tin lead

Explanation:

i hope this will help you :)

There's Hydrogen and Helium

Then Lithium, Beryllium

Boron, Carbon everywhere

Nitrogen all through the air

With Oxygen so you can breathe

And Fluorine for your pretty teeth

Neon to light up the signs

Sodium for salty times

Silicon

(Phosphorus, then Sulfur) Chlorine and Argon

(Potassium) And Calcium so you'll grow strong

(Scandium) Titanium, Vanadium and Chromium and Manganese

This is the Periodic Table

Noble gas is stable

Halogens and Alkali react aggressively

Each period will see new outer shells

While electrons are added moving to the right

Iron is the 26th

Then Cobalt, Nickel coins you get

Copper, Zinc and Gallium

Germanium and Arsenic

Selenium and Bromine film

Answer:

tends to split along bands

Explanation:

Answer: C

Explanation: E2022

Answer:

Coefficient = 1.58

Exponent = - 5

Explanation:

pH = 2.95

Molar concentration = 0.0796M

Ka = [H+]^2 / [HA]

Ka = [H+]^2 / 0.0796

Therefore ;

[H+] = 10^-2.95

[H+] = 0.0011220 = 1.122 × 10^-3

Ka = [H+] / molar concentration

Ka = [1.122 × 10^-3]^2 / 0.0796

Ka = (1.258884 × 10^-6) / 0.0796

Ka = 15.815 × 10^-6

Ka = 1.58 × 10^-5

Coefficient = 1.58

Exponent = - 5

Answer:

Ca3N2

Explanation:

Answer:

Explanation:

1) Chemical change :

It is permanent change.

Heat or energy is given out during the process

Physical change :

It is a temporary change.

Heat or energy in not given out during the process.

2) Condensation of water vapour is a physical change.

hope this helps

plz mark it as brainliest!!!!!!!

Answer:

i. The difference between physical and chemical change is that a physical change merely changes the shape and size of the substance while a chemical change produces altogether new substance.

ii condensation of water vapour is a physical change

Explanation:

Answer:

D.

The concentration of reactants and the concentration of products are constant.

Explanation:

pls mark as brainliest

Answer:

B. N2

Explanation:

The triple bonds pull the atoms closer together, and since N2 is the only molecule with the triple bond, it is the shortest bond length.

Answer: When the enthalpy of this overall chemical equation is calculated, the enthalpy of the second intermediate equation is halved and has its sign changed.

Explanation:

Hess’s law of constant heat summation states that the amount of heat absorbed or evolved in a given chemical equation remains the same whether the process occurs in one step or several steps.

According to this law, the chemical equation is treated as ordinary algebraic expressions and can be added or subtracted to yield the required equation. This means that the enthalpy change of the overall reaction is equal to the sum of the enthalpy changes of the intermediate reactions.

The overall chemical reaction follows:

[tex]CaO(s)+CO_2\rightarrow CaCO_3(s)[/tex]     [tex]\Delta H^o_{rxn}=?[/tex]

The intermediate balanced chemical reaction are:

(1) [tex]Ca(s)+CO_2(g)+\frac{1}{2}O_2(g)\rightarrow CaCO_3(s)[/tex]    [tex]\Delta H_1=-812.8kJ[/tex]  

(2) [tex]2Ca(s)+O_2(g)\rightarrow 2CaO(s)[/tex]     [tex]\Delta H_2=-1269kJ[/tex]

The expression for enthalpy of the reaction follows:

[tex]\Delta H^o_{rxn}=[1\times (\Delta H_1)]+[\frac{1}{2}\times (-\Delta H_2)][/tex]

Hence, when the enthalpy of this overall chemical equation is calculated, the enthalpy of the second intermediate equation is halved and has its sign changed.

Answer:

A. is halved and has its sign changed.

Explanation:

just took the test on edge

Answer:

The answer is option A.

Distilled water

Since all the chemicals that will cause hardness in the water has been removed.

Hope this helps.

Answer:

The answer is C

Explanation:

Aluminium oxide is an amphoteric oxide.

MgO is a basic oxide.

N2O is an acidic oxide.

SO2 is an acidic oxide.

Answer:

c

Explanation:

Answer:

The answer is OXIDATION REACTION.

Answer:

There's no other metal.

Explanation:

Iron reacts only with water and air to get the object rusted. There is no other metal which reacts with iron to get the object rusted.

However,

Zinc can be used to protect Metal from Rusting.

Answer:

A

Explanation:

Redox reactions are comprised of two parts, a reduced half and an oxidized half, that always occur together. The reduced half gains electrons and the oxidation number decreases, while the oxidized half loses electrons and the oxidation number increases.

Answer:

a

Explanation: