Calculate the minimum volume of oxygen

that is required for the complete combustion

of a mixture of 20cm3 of CO and 25cm3 of

hydrogen.

A. 45 cm3

B. 22.5cm3

C. 20 cm3

D. 10 cm3​

Answer:

32

Explanation:

You have 7 valance electrons in fluorine, and you have 4 of them. 7*4=28. Then, you have 4 valance electrons on carbon. So 28+4=32

Answer:

No reaction should occur

Explanation:

Water cannnot be made from the components

Nothing will be released as a gas

Both products are soluible in water therefore will not form a precipitate.

If I mix a solution of Na2SO4 and KCl, no reaction should occur.

Whether or not, a reaction occurs when two substances are mixed depends on the respective positions of the substances in the electrochemical series.

Now, we are expecting the reaction; Na2SO4 (aq) + 2 KCl(aq) + 2 NaCl(aq) + K2SO4 (aq) to occur. The big question is, between sodium and potassium, which is higher in the electrochemical series?

A little look into the image attached shows that potassium is higher than sodium in the series so the reaction is possible.

However, the both products are aqueous, they are both soluble in water hence no visible reaction occurs.

Learn more: https://brainly.com/question/24058474

Answer:

The total amount of heat is 250.64 kcal.

Explanation:

Given that,

Total amount of heat = 2.000 kg

Temperature of snow = -15.00°C

Temperature of water = 38.00°C

Heat of fusion of water = 1.44 kcal/mol

Specific heat of solid water = 0.488 cal/g°C

Specific heat of liquid = 1.00 cal/g°C

We need to calculate the heat required to bring temperature -15°C to 0°C snow

Using formula of heat

[tex]Q_{1}=mc_{p}\Delta T[/tex]

Put the value into the formula

[tex]Q_{1}=2000\times0.488\times(0+15)[/tex]

[tex]Q_{1}=14640\ cal[/tex]

[tex]Q_{1}=14.640\ kcal[/tex]

We need to calculate the heat required to convert 0°C snow  into 0°C water

Using formula of heat

[tex]Q_{2}=ml[/tex]

Put the value into the formula

[tex]Q_{2}=\dfrac{2000}{18}\times1.44[/tex]

[tex]Q_{2}=160\ kcal[/tex]

We need to calculate  heat required to increases temperature of water from 0°C  to 38°C

Using formula of heat

[tex]Q_{3}=mc_{p}\Delta T[/tex]

Put the value into the formula

[tex]Q_{3}=2000\times1.00\times(38-0)[/tex]

[tex]Q_{3}=76000\ cal[/tex]

[tex]Q_{3}=76\ kcal[/tex]

We need to calculate the total heat

Using all heat amount

[tex]Q=Q_{1}+Q_{2}+Q_{3}[/tex]

Put the value into the formula

[tex]Q=14.640+160+76[/tex]

[tex]Q=250.64\ kcal[/tex]

Hence, The total amount of heat is 250.64 kcal.

Answer:

No simple relationship exists between population size and environmental change. However, as global population continues to grow, limits on such global resources as arable land, potable water, forests, and fisheries have come into sharper focus.

Explanation:

The answer would be B.

Answer:

Salty water

Explanation:

Sorry for wasting your time.

yes they can be changed becasue they are expose to the environment

That's why it's improtant to have a calorimeter so the energy and heat are contained

The total energy of an open system be changed if:

According to the First Law of Thermodynamics, energy cannot be created or destroyed, it can only change form.

An open system is a system that has an interaction with its environment where matter or energy can be added or removed from the environment.

As a result of this, the total energy of an open system can be changed if there is an exchange between matter and energy and they remain constant.

Therefore, the correct answer is an exchange has to take place for the total energy in an open system to be changed.

Read more here:

https://brainly.com/question/20319024

Answer:

2.04 x 10⁻¹⁹J

Explanation:

Given parameters:

  Frequency = 3.08 x 10¹⁴Hz

Unknown:

The energy of the photon  = ?

Solution:

 The energy of a photon is given as;

          E = hf

Where h is the planck's constant

            f is the frequency

Insert the parameters and solve;

           E = 6.63 x 10⁻³⁴ x 3.08 x 10¹⁴

          E = 20.4 x 10⁻³⁴⁺¹⁴

           E = 20.4 x 10⁻²⁰  = 2.04 x 10⁻¹⁹J

Answer:

2.97*10-19 j

Explanation:

E=Energy of photon

H=Planck constant=6.626*10-34

V=Frequency of photon

we can plug what we already know E=(6.626*10-34)(4.48*10 14)

Answer:

i cry when im alone

Explanation:

Answer:

Mass = 2.8 g

Explanation:

Given data:

Number of molecules of CO = 6.2×10²²

Mass of CO = ?

Solution:

We will use Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

For given  6.2×10²² molecules of CO mass will be,

1 mole = 6.022 × 10²³ molecules of CO

6.2×10²² molecule × 1 mole/  6.022 × 10²³ molecules of CO

0.1 mol

Mass of CO:

Mass = number of moles  × molar mass

Mass = 0.1 mol  × 28 g/mol

Mass = 2.8 g

in endothermic reaction heat is added

Answer:

what are the options?

Explanation:

Answer:

its shorter than a regular one

Explanation:

the only reason is simply because it is shorter

Answer:

Copper Atoms

Explanation:

All copper atoms have atomic number 29: all their nuclei contain 29 protons. But they also contain uncharged particles called neutrons. In natural copper, the atoms are of two kinds. One has 29 protons and 34 neutrons in the nucleus; the other has 29 protons and 36 neutrons

Answer:

A

Explanation:

Answer:

0.219 g/mL.

Explanation:

From the question given above, the following data were obtained:

Mass = 25 g

Volume = 114 mL

Density =.....?

Density of a substance is simply defined as the mass of the substance per unit volume of the substance. Mathematically, it is expressed as:

Density = mass /volume

With the above formula, we can obtain the density of the substance given in the question above as follow:

Mass = 25 g

Volume = 114 mL

Density =.....?

Density = mass /volume

Density = 25/114

Density = 0.219 g/mL

Therefore, the density of the substance is 0.219 g/mL

Answer:

Meter

Explanation:

Answer:

A

Explanation:

the number of molecule won't be twice as fructose has 12 hydrogen molecules and lactose has 22 hydrogen molecules

From the given statements, the statement saying that the number of atoms in Lactose is twice the number of atoms in Fructose is not correct. Thus option A is correct.

The given molecules in the list are Glutamine, Lactose, fructose, and Sorbitol.

The number of atoms in the following compounds is:

Statement A says that the number of atoms in Lactose is twice the number of atoms in Fructose. The twice atoms of Fructose are 48 atoms. The number of atoms of lactose is 45.

Thus statement A is incorrect. Thus option A is correct.

For more about the atoms in a molecule, refer to the link:

https://brainly.com/question/25617532

Answer: the electric charge

Explanation:

Answer:

2. Worm Y reproduces sexually, which gives it genetic variation.

Answer:

B      Worm Y reproduces sexually, which gives it genetic variation.

Explanation:

hope you all have a good day

Luster means Shiny. Dull means simple and not full of detail. Hope this helps!Please Rate Brainiest!

-Aslina

Answer:

Explanation:

The formula is density = mass÷volume

Values given are:

mass = 5.910g  and

diameter = 10.0 mm = 1cm

so, we need to find the volume first.

Volume of a sphere is (4/3)πr³

thus, V = 4.189 cm³

Density = mass ÷ volume

density = 5.910 ÷ 4.189

= 1.411 g/cm³

Answer:gamma rays

Explanation:

Answer:

the substance is an acid

Answer:

CO2

Explanation:

the subscript tells you how many of one element is used for this case there is one black atom and 2 red ones so you only need 1 carbon and 2 oxygens.

hope this helps. brainliest please?

Answer:

Electromagnetic waves or EM waves are waves that are created as a result of vibrations between an electric field and a magnetic field. Hope it helps ;)

Answer:

can someone please do this and put the answers below !!!!

Explanation: