How many hydrogen molecules are needed to produce two H2O molecules

Answers

Answer 1

Answer:

There are 2 Hydrogen molecules in H2O

Explanation:

if you look at the symbol for Hydrogen (H) you see that there is a number beside it, to the right. That number shows how many molecules there are of that element.

(Sidenote: If there is no number there is only one molecule)

Hope this helped :)

Answer 2
There are 2per molecules But the question is asking for 2 molecules of it so 2x2= 4... 4 is the answer!

Related Questions

A log has a density of .8 g/cm³. What will happen to this log in freshwater, which has a density of 1.0 g/cm³?

It will sink.
It will float.
It will move deeper.
It will decrease in density.

Answers

Explanation:

Objects with a lower density will float while objects with a higher density will sink.

Since 0.8g/cm³ < 1.0g/cm³,

The log will float in freshwater.

Robert makes a glass of tea and takes it outside with him. While outside, the thermal energy within the glass of tea is transferred to its surroundings. Based on this information, what else is happening within the glass of tea?
A.
The kinetic energy of the particles is increasing and the temperature is decreasing.
B.
The kinetic energy of the particles is increasing and the temperature is increasing.
C.
The kinetic energy of the particles is decreasing and the temperature is increasing.
D.
The kinetic energy of the particles is decreasing and the temperature is decreasing.

Answers

Answer:

A

Explanation:

i had answer it and it was A

Write
the following separation techniques?
a. Filtration
b. Evaporation
C. Fractional distillation
d. Chromatography​

Answers

Answer:

Explanation: Fractional distillation

Find the volume of
this object.
5 cm
5 cm
5 cm
A
15 cm3
B
125 cm3
C
30 cm3

Answers

Answer:  B. [tex]125\ cm^3[/tex].

The volume of the given object = [tex]125\ cm^3[/tex]

Explanation:

Given : Dimensions of an object : 5 cm x 5 cm  x 5 cm [ it is a cube with all equal sides]

Formula to find the volume of a cube = [tex](side)^3[/tex]

[tex]=5^3\ cm^3=125\ cm^3[/tex]

Hence, the volume of the given object = [tex]125\ cm^3[/tex]

Therefore , the correct option is B. [tex]125\ cm^3[/tex].

What are the rules for writing
names/formulas for covalent
compounds? Give examples
where you need to produce
the formula from the name
AND the name from the
formula

Answers

Answer:

When naming molecular compounds prefixes are used to dictate the number of a given element present in the compound. ” Mono-” indicates one, “Di-” indicates two, “Tri-” is three, “Tetra-” is four, “Penta-” is five, and “Hexa-” is six, “Hepta-” is seven, “Octo-” is eight, “Nona-” is nine, and “Deca-” is ten.

If I change the volume of a solution from 5.00 L to 10.0 L, what was the new
concentration if the original concentration was 4.0 M? Please help me as soon as possible with explanation.

Answers

The new  concentration = 2 M

Further explanation

Dilution is a process of decreasing the concentration of a solution by adding a number of solvents

Can be formulated

M₁V₁=M₂V₂

M₁ = Initial Molarity

V₁ = Initial volume

M₂ = Final Molarity (after dilution)

V₂ = Final volume (after dilution)

V₁=5 L

V₂=10 L

M₁=4 M

The new  concentration(M₂) :

[tex]\tt M_2=\dfrac{V_1.M_1}{V_2}\\\\M_2=\dfrac{5\times 4}{10}\\\\M_2=2~M[/tex]

what is the balanced equation for naphthalene and sulphur?​

Answers

napthalene: C10H8 sulphur: S02

Explanation:

C10H8

What type of minerals make up more than 90% of the earth's crust?


sulfites


silicates


stalagtites


hematites

Answers

Answer:

Rocks

Explanation:

Answer:

silicate

Explanation:

how dose dissolving sugar in water show that matter is made up of particles

Answers

Answer:

When sugar dissolves, the sugar particles separate from each other and mix with the water particles. When the sugar particles separate, the smaller water particles fit into the spaces between the larger sugar particles. The water and sugar particles are attracted to each other, so they move closer together when they mix.

Explanation:

:  )

Jill is recovering from the Flu. At lunchtime, she shares her water bottle with her friend Dara. The next day,
Dara is sick. Which type of Disease is the Flu

Answers

Answer: I think its a virus

Explanation: Viruses spread form person to person just like any virus so if I'm correct the disease is a virus

Look at the following chemical equation.

10Ag + S = 8Ag S

What is true about this chemical equation? (Hint: The reactant is the substance at the start of a chemical reaction.

The product is the substance at the end of the chemical reaction.

A.It is unbalanced because the number of reactants is less than the number of products.

IB.t is balanced because the products contain the same number of sulfur (S) atoms as the reactants.

C.It is balanced because the mass of the reactants is equal to the mass of the products.

D.It is unbalanced because the products contain fewer silver (Ag) atoms than the reactants.

Answers

Answer: I think it is D

Explanation:

3. The solubility of sodium chlorate in water is 52g / 100g H20. If 0.46 moles of sodium
chlorate are dissolved in 60g of water, is this solution
saturated/supersaturated/unsaturated?

Answers

hello! i think the answer is saturated

magnesium sulfide + nitric acid net ionic

Answers

Answer:

MgSO_3(s) + 2 HNO_3(aq) rightarrow Mg^2+(aq) + 2 NO_3^-(aq) + SO_2(g) + H_2O(l) b.

Explanation:

The balanced net ionic equation for the reaction of magnesium sulfite with nitric acid is a. MgSO_3(s) + 2 HNO_3(aq) rightarrow Mg^2+(aq) + 2 NO_3^-(aq) + SO_2(g) + H_2O(l) b.

How many grams are in 2.3 x 1024 formula units of KNO3?

Answers

Answer:

390 g KNO₃

General Formulas and Concepts:Chemistry

Atomic Structure

Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Math

Pre-Algebra

Order of Operations: BPEMDAS

Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to Right Explanation:

Step 1: Define

2.3 × 10²⁴ formula units KNO₃

Step 2: Identify Conversions

Avogadro's Number

Molar Mass of K - 39.10 g/mol

Molar Mass of N - 14.01 g/mol

Molar Mass of O - 16.00 g.mol

Molar Mass of KNO₃ - 39.10 + 14.01 + 3(16.00) = 101.11 g/mol

Step 3: Convert

[tex]2.3 \cdot 10^{24} \ formula \ units \ KNO_3(\frac{1 \ mol \ KNO_3}{6.022 \cdot 10^{23} \ formula \ units \ KNO_3} )(\frac{101.11 \ g \ KNO_3}{1 \ mol \ KNO_3} )[/tex] = 386.172 g KNO₃

Step 4: Check

We are given 2 sig figs. Follow sig fig rules and round.

386.172 g KNO₃ ≈ 390 g KNO₃

a sample of helium gas is in a sealed rigid container

Answers

is there a question or no? im confused.

What’s the question?

ASAP PLZ HELP I WILL MARK BRAINLIEST Based on the diagram, what can you conclude about the pole of the magnet? O It is a south pole because the field lines spread out from this end. O It is a north pole because the field lines spread out from this end, O It is a south pole because the field lines enter the magnet at this end. O It is a north pole because the field lines enter the magnet at this end.​

Answers

Answer:C

Explanation:I took the test

Answer:

It is a south pole because the field lines enter the magnet at this end.

Explanation:

What is a "mole" in chemistry?

Answers

Answer:

Mole, also spelled mol, in chemistry, a standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other

Answer:

Mole, also spelled mol, in chemistry, a standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles.

Explanation:

A football player kicks a 0.94 kg football with a force of 2.4 N.

Calculate the acceleration of the football as the player kicks the ball. Round your answer to the nearest tenth of a m/s2.

The acceleration of the football is

Answers

Explanation:

Fnet = ma

Therefore a = Fnet/m = 2.4N/0.94kg = 2.45m/s².

Answer:

2.6  m/s2

Explanation:

A mixture is prepared using 27.00 mL of a 0.0758 M weak base (pKa=4.594) , 27.00 mL of a 0.0553 M weak acid (pKa=3.235) and 1.00 mL of 1.25×10−4 M HIn and then diluting to 100.0 mL, where HIn is the protonated indicator. The absorbance measured at 550 nm in a 5.000 cm cell was 0.1102 . The molar absorptivity (????) values for HIn and its deprotonated form In− at 550 nm are 2.26×104 M−1cm−1 and 1.53×104 M−1cm−1 , respectively. What is the pH of the solution?

Answers

Answer:

pH = 4.164

Explanation:

The first process is to find the initial moles for the base (B) & the acid (HA)

i.e.

[tex]= \dfrac{27 mL \times 0.0758 \ moles \ \ of \ B}{1000 \ mL}[/tex]

[tex]=0.0020466[/tex]

[tex]\simeq 2.047\times 10^{-3} \ moles \ of \ B[/tex]

[tex]= \dfrac{27 mL \times 0.0553 \ moles \ \ of \ HA}{1000 \ mL}[/tex]

[tex]=0.0014931[/tex]

[tex]\simeq 1.493\times 10^{-3} \ moles \ of \ HA[/tex]

The acid with base reaction is expressed as;

          HA              +      B         →             A⁻            +         HB⁺

to    1.493 × 10⁻³       2.047 × 10⁻³             -                         -

    -  1.493 × 10⁻³       1.493 × 10⁻³         1.493 × 10⁻³         1.493 × 10⁻³

            0                    5.54 × 10⁻⁴         1.493 × 10⁻³         1.493 × 10⁻³

From observation; both the acid & base weak

Given that:

The pKa for base = 4.594

The pKa for acid = 3.235

Recall that;

pKa = -log Ka

So; Ka = [tex]\mathbf{10^{-Ka}}[/tex]

By applying this:

For Base; Ka = [tex]10^{-4.594}[/tex] = 2.5468 × 10⁻⁵

For Acid:  Ka = [tex]10^{ -3.235}[/tex] = 5.821 × 10⁻⁴

After the reaction; we have the base with its conjugate acid & conjugate base of acid; Thus, since the conjugate acid of the base possesses a higher value of K, it is likely it would be the one to define the pH of the solution.

By analyzing the system, we have:

              HB⁺         + H₂O           ↔           B          +            H₃O⁺

     [tex]\dfrac{1.493\times 10^{-3}}{0.1 \ L}[/tex]                                 [tex]\dfrac{5.54\times 10^{-4}}{0.1 \ L}[/tex]

to   0.01493 M                                 0.00554   M

  -      x                                                   x                                x

    0.01493 - x                                 0.00554 - x                     x

Thus;

[tex]2.5468 \times 10^{-5} = \dfrac{(0.00554 -x)\times x}{(0.01493-x)}[/tex]

Using the common ion effect;

0.00554 - x   [tex]\simeq[/tex]  0.00554   &

0.01493 -  x   [tex]\simeq[/tex]   0.01493

[tex]x = \dfrac{2.5468 \times 10^{-5} \times 0.01493}{0.00554}[/tex]

x =  [H₃O⁺] = 6.8635  × 10⁻⁵

pH = -log(6.8635  × 10⁻⁵)

pH = 4.164

Please Help!

Your car has 1.95 gallons of gasoline (octane, d = 0.6916 g/mL), which reacts with oxygen
according to the balanced reaction below. Your car uses the energy produced by this reaction
at a rate of 115 kJ per second while traveling at a speed of 65 miles per hour. Calculate the
distance (in miles) the car can travel using this amount of octane.
2 C8H18(g) + 25 O2(g) -----> 16 CO2(g) + 18 H2O(g) ΔHrxn = -10,900 kJ

Answers

Answer:

38.3 miles

Explanation:

First, we convert 1.95 gallons to mililiters:

1.95 gallons * [tex]\frac{3.785 L}{1gallon}*\frac{1000mL}{1 L}[/tex]= 7380.75 mL

Then we calculate how many grams of octane are available for the reaction, using its density:

0.6916 g/mL * 7380.75 mL = 5104.53 g C₈H₁₈

Now we convert octane grams into octane moles, using its molar mass:

5104.53 g C₈H₁₈ ÷ 114 g/mol = 44.78 mol C₈H₁₈

Then we calculate how many kJ are produced from the combustion of  44.78 mol C₈H₁₈, if 2 moles produce 10900 kJ:

44.78 mol * 10900 kJ / 2 mol = 244032 kJ

We calculate how many seconds is the car available to keep going, if it spends 115 kJ per second:

244032 kJ * 1 s / 115 kJ = 2122.02 s

We convert seconds to hours:

2122.02 / 3600 = 0.59 hours

Finally we calculate the distance:

65 mi/hour * 0.59 hour = 38.3 mi

Please help, it’s much appreciated



If the hydrogen ion concentration,
[H+], in a solution is 2.65 x 10-2 M,
what is [OH-]?

Answers

Answer: acidic

Explanation:

Answer:

3.77 x 10^-13 M

Explanation:

How many moles of copper are in 6,000,000 atoms of copper?

Answers

Answer: There will be 9.9632 × 10⁻¹⁸ moles of Copper in 6,000,000 atoms of Copper.

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5 Mi
Question 1
1 pts
Where did most of the heat of the Earth come from at its formation?
O Seismic waves
O Radioactive decay
O Planetesimals crashing into each other
Peridotite xenoliths
Question 2
1 pts

Answers

Answer:

radioactive decay

Explanation:

a study reveals that only about half of our planets internal heat stems from natural radioactivity the rest is primordial heat left over from when earth first coalesced from a hot ball of gas dust and other material

You want to measure the volume of a gold bracelet. For this purpose, a specimen with 20 mL of water is available; when inserting the bracelet, the water level rises to 25 mL. If the density of gold is 19300 Kg/m3. What will be the mass of the bracelet?

Answers

Answer:

volume of bracelet is 5cm3

mass is 0.0965Kg

Explanation:

1ml = 1cm3

1m3 = 1000000cm3

0.000005m3

Mass = volume*density

19300 Kg/m3 * 0.000005m3 = 0.0965Kg

what does the phrase sea of electrons describe?? please help

Answers

Answer: Metallic Bonding.In metallic bonds, the valence electrons from the s and p orbitals of the interacting metal atoms delocalize. That is to say, instead of orbiting their respective metal atoms, they form a “sea” of electrons that surrounds the positively charged atomic nuclei of the interacting metal ions.

Explanation:

HELP FAST! PLEASE
This is due in 4 hrs!!!!! Ahhhh

Answers

The amplitude is greater for both

The frequency is for wave two

Explanation:

it was believed that earth was a stationary object at the center of the universe all other objects in space without to go around earth which of these is a criticism of this idea

Answers

Answer: is that a question or

Explanation:

Answer:

its c

Explanation:

Plz help
Plz and thank u

Answers

D Excretory systems regulate the chemical composition of body fluids by removing metabolic wastes and retaining the proper amounts of water, salts, and nutrients. Components of this system in vertebrates include the kidneys, liver, lungs, and skin.

If I Gave A Pig Bacon Would He Eat It ?

Answers

probably, i wouldn’t do it, but like, if you find it necessary, go for it homeslice.

What is the atomic number of this atom?

6
8
9
16

Answers

The atomic number of this atom : 8

Further explanation

Given

Atomic model (attached)

Required

The atomic number

Solution

To determine the atomic number of an element, we can look at the number of electrons or the number of protons, because

atomic number = number of protons = number of electrons in neutral atoms

While the mass number is the number of neutrons + the number of protons located in the atomic nucleus

The charge of each of these atomic sub particles:

electron: charge -1proton: charge +1neutron: not charged / 0

If we look at this atomic model, there are 8 electrons in the shell, consisting of 2 electrons in the first shell and 6 electrons in the second shell (which can also be called valence electrons)

Whereas in the atomic nucleus there are 8 protons and 10 neutrons

Answer:8

Explanation:

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