Learning Task 1 Match column A with column B. Column A Column B 1. Phase Change -2. Freezing 3. Condensation 4. Melting 5. Evaporation a. temperature wherein a liquid solidifies b. change from one state to another without a change in chemical composition c. the temperature at which solid turns into a liquid d. the temperature at which vapor pressure becomes high that causes bubbles to form inside the body of the 6. Freezing point 7. Boiling point 8. Melting point 9. 100°C 10.0°C e. f. liquid the change from liquid to gas happens when solid turns to liquid freezing and melting point of water boiling point of water happens when a gas turns into a g h. i. liquid​

Answer:

the problem is that Gary is not the smartest snail.the hypothesis is that he thinks he can get smarter by eating super snail food everyday.

hope this helps

Answer:

this is right because carbon and oxygen complete its octet

Considering the definition of STP conditions and reaction stoichiometry, the volume of excess reactant that remains after the reaction is complete is 4.928 L.

The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.

In first place, the balanced reaction is:

CH₄ + 2 O₂  → CO₂ + 2 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

You know that in a certain reaction at STP, 29.2 L of methane CH₄ is combusted with 63.3 L of oxygen O₂.

Considering the definition of STP, you can apply the following rules of three:

[tex]amount of moles of methane=\frac{29.2 Lx1 mole}{22.4 L}[/tex]

amount of moles of methane= 1.30 moles

[tex]amount of moles of oxygen=\frac{63.3 Lx1 mole}{22.4 L}[/tex]

amount of moles of oxygen= 2.82 moles

Now you can apply the following rule of three to determine the excess reagent: if by stoichiometry 2 moles of O₂ reacts with 1 mole of CH₄, if 2.82 moles of O₂ react, how much moles of CH₄ will be needed?

[tex]moles of CH_{4} =\frac{2.82 moles of O_{2}x 1 moles of CH_{4}}{2 moles of O_{2}}[/tex]

moles of CH₄= 1.41 moles

But 1.41 moles of CH₄ are not available, 1.30 moles are available. Since you have less moles than you need to react with 2.82 moles of O₂, methane CH₄ will be the limiting reagent. And oxygen O₂ is excess reagent.

Now you can apply the following rule of three to the amount of O₂ that reacts when the limiting reactant reacts completely: if by stoichiometry 1 mole of CH₄ reacts with 2 moles of O₂, if 1.30 mole of CH₄ react, how much moles of O₂ will be needed?

[tex]moles of O_{2} =\frac{2 moles of O_{2}x 1.30 moles of CH_{4}}{1 moles of CH_{4}}[/tex]

moles of CH₄= 2.60 moles

So, after the reaction is complete, the moles of excess reactant that remains are calculated as:

2.82 moles - 2.60 moles= 0.22 moles

Finally, considering the definition of STP, you can apply the following rule of three: if by definition of STP conditions 1 mole of O₂ occupies a volume of 22.4 liters, 0.22 moles occupies how much volume?

[tex]volume=\frac{0.22 molesx22.4 L}{1 mole}[/tex]

volume= 4.928 L

In summary, the volume of excess reactant that remains after the reaction is complete is 4.928 L.

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carbon(iv) oxide and water.

Answer:

temperatures within the outer core range from 7,200 to 9,000 F. Pressure also increases in the outer core due in part to the weight of the crust and mantle above.The Earth's magnetic field is generated by the outer core.

Explanation:

Answer: chromatography

Explanation:

Answer:

C8H18

Explanation:

Answer:

376.56J

Explanation:

The amount or quantity of heat absorbed can be calculated using the formula:

Q = m × c × ∆T

Where; Q = amount of heat absorbed (J)

m = mass of water (g)

c = specific heat capacity of water (J/g°C)

∆T = change in temperature (°C)

According to the provided information in this question; m = 10.0g, c = 4.184J/g°C, final temperature = 32°C, initial temperature = 23°C

Q = m × c × ∆T

Q = 10 × 4.184 × (32 - 23)

Q = 41.84 × 9

Q = 376.56J

Answer:

1 answer

Explanation:

Answer:

Chadwick-he discovered the neutron. He discovered this by demonstrating a neutral particle with a mass the same as a proton through a reaction between gramma Ray's and a wax sample.

Rutherford-he discovered the concept of radioactive half-life, the radioactive element radon, and named alpha and beta radiation.

j.j.Thompson discovered that atoms where made up of smaller components. This had major effects for the field of physics.

:)

Answer:

2C3H8S +13O2 =6CO2 +8H20 +2SO3

Answer:

get from (4,1) to (2,9) go up 8 and over 2 left (-2) - (4 - 2, 1 + 8), do this again (2 - 2, 9+8) and end up at (0,17) which is the y how do you change 7x+3y=3 into slope intercept form.

get from (4,1) to (2,9) go up 8 and over 2 left (-2) - (4 - 2, 1 + 8), do this again (2 - 2, 9+8) and end up at (0,17) which is the y how do you change 7x+3y=3 into slope intercept form.

get from (4,1) to (2,9) go up 8 and over 2 left (-2) - (4 - 2, 1 + 8), do this again (2 - 2, 9+8) and end up at (0,17) which is the y how do you change 7x+3y=3 into slope intercept form.

get from (4,1) to (2,9) go up 8 and over 2 left (-2) - (4 - 2, 1 + 8), do this again (2 - 2, 9+8) and end up at (0,17) which is the y how do you change 7x+3y=3 into slope intercept form.

The main difference between electronegativity and electron affinity is that electronegativity is the ability of an atom to attract electrons from outside as far as electron affinity is the amount of energy an atom receives when an electron. Electron negativity is applied to a single atom.

Answer:

1. whales  are mammals and fish are not

2. Fish have gills which extract oxygen from the water and thus allow it to live underwater its entire life. Whales on the other hand do not have gills but instead have one or two blowholes

3. whales provide milk to their young and fish do not!

Explanation:

A decomposition reaction occurs when one reactant breaks down into two or more products. It can be represented by the general equation: AB → A + B. In this equation, AB represents the reactant that begins the reaction, and A and B represent the products of the reaction.

RbCI = rubidium chloride

Answer:

bc the water molecules freeze

The amount of millimoles of solid naoh that must be added to 50.0 milliliters is: 5.0 mmol of NaOH.

The [H+] at pH 7.49 is:

[H+] = 10–^7.49

[H+]= 3.24×10–^8 M

And when the solution is half-neutralized pH will be:

pH = pKa while  [OCl– ]÷[HOCl] = 1

Now let find the millimoles of solid naoh:

0.20 mol HOCl÷1 L× 50.0 mL

= 10.0 mmol HOCl

Half of 10.0 mmol HOCl will be added

Millimoles of solid naoh=10.0 mmol HOCl÷2

Millimoles of solid naoh= 5.0 mmol of NaOH

Inconclusion the amount of millimoles of solid naoh that must be added to 50.0 milliliters is: 5.0 mmol of NaOH.

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Your Q is not visible .Plz provide it

2. D, because transition metals have a high density.

3. B, because the properties of elements depend on the valence electrons.

4. C, because the atom emits a negatively charged electron, the atom becomes positively charged.

5. D, because hydrogen and helium are both lighter than air, but hydrogen is very reactive, that's why helium is used.

6. A, because it creates caustic soda.

7. C, because only fluorine and argon are gases, but argon is not two-molecular.

8. C, because iodine is either solid or gaseous. Solid iodine is gray and gaseous iodine is purple.

9. C, because all elements of the first main group have an odd number of protons and react violently with water.

10. D, because oxygen is air. Nitrogen is very reactive and helium is lighter than air.

11. A, because carbon has atomic number 6 and magnesium has atomic number 12.

12. B, because table salt is sodium chloride.

13. B, because sodium ions and neon have the same electron configuration.

14. C, because chloride ions and argon have the same electron configuration.

15. C, because calcium ions and argon have the same electron configuration.

16. D

17. C, because silicon has 4 valence electrons and a total of 14 electrons.

18. A

19. B, because it's sodium.

20. Number of protons and electron shells

21. first main group

22. seventh main group

23. cesium

24. fluorine

25. alkali metals

26. alkaline earth metals

27. halogens

28. from metal to nonmetal

29. valence electrons

30. electron shells

31. main group and subgroup

32. semi-metal

33. 18 groups and 7 periods

34. groups

35. periods

Answer:

ionization energy is the answer

Answer:

2Al + 3NiSO4 -> Al2(SO4)3 + 3Ni

Explanation:

You just had to balance the equation by looking at Al2(SO4)3. It helps to pick the right coefficients for other components.

The correct set of coefficients for the balanced equation is: 2, 3, 1, 3.

When balancing the equation:  2Al + 3NiSO₄ → Al₂(SO₄)₃ + 3Ni .The coefficients indicate the number of each compound or element required for the equation to be balanced. In this case, the equation is balanced by ensuring that the number of atoms of each element is the same on both sides of the equation.

By placing the coefficients 2 and 3 in front of Al and NiSO₄, respectively, it ensures that there are an equal number of aluminum and nickel atoms on both sides. Additionally, the coefficient 3 in front of Ni and Al₂(SO₄)₃ ensures an equal number of nickel and sulfate groups.

Balancing equations is important because it follows the principle of conservation of mass, ensuring that no atoms are gained or lost during a chemical reaction. The set of coefficients chosen allows for the equation to meet this principle and maintain a balanced representation of the chemical reaction.

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Answer:

buffer

Explanation:

Answer:

[D]can be reversed with no net change in either system or surroundings

A reversible process is one that can be reversed with no net change in either system or surroundings. Therefore, option (D) is correct.

A thermodynamic process can be reversible if the process can be turned back to both the system and the surroundings to return to their original states, with no other change in the universe.

No such processes as reversible processes can exist and these processes can easily be defined as idealizations or models of real processes.

A few examples of Reversible Processes: are the extension of springs, slow adiabatic compression or expansion of gases, electrolysis, the frictionless motion of solid, slow isothermal compression or expansion of gases

An irreversible process is a process in which the system and the surroundings do not return to their actual condition once the process is initiated. Examples of irreversible processes are Heat transfer, Diffusion, and electricity flow through a resistance.

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Answer:

Explanation:

The kinetic energy of an object can be found by using the formula

[tex]KE = \frac{1}{2} m {v}^{2} \\ [/tex]

where

m is the mass

v is the velocity

From the question we have

[tex]KE = \frac{1}{2} \times 700 \times {20}^{2} \\ = 350 \times 400[/tex]

We have the final answer as

Hope this helps you

Answer:

A standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles.

All the data is given in the question and these are as follows:-

Moles - 0.75

Na - 6.022*10^{23

The formula we are using to find the molecules is as follows:-

n = \frac{molecule}{Na}n=

Na

molecule

After, putting the value and solving it. we will get

0.75 * 6.022*10^2^3 = 4.5165*10^{23

Answer:

True

Explanation:

A hand weavers would take much more time in their craft than large factories did, their industry began to decline and be replaced by industrial machines.

[tex]\huge\bold\red{Answer:-}[/tex]

It’s the same as when magnesium reacts with liquid water, only faster:

Mg + 2H₂O → MgO + H₂.

The difference is that in water, the reaction has a second step, converting MgO to Mg(OH)₂.

Explanation:

A reference point is a place or object used for comparison to determine if something is in motion. An object is in motion if it changes position relative to a reference point. Objects that are fixed relative to Earth – such as a building, a tree, or a sign - make good reference points.

Answer:

Ethenol + Oxygen = water + Carbon Dioxide C2H5OH + 3O2 = 2CO2 + 3H2O

Explanation:

Answer:

Loss of oxygen

Explanation:

Shortcut defination of oxidation and reduction

The final temperature of the bomb calorimeter is 30.9°C.

Combustion reactions are those reactions in which a compound completly decompose in to carbon dioxide and water molecule.

The final temperature will be calculated by using the equation:

Q = mc(T₂ – T₁), where

Q = relesed heat from calorimeter = 24kJ = 24000J

m = mass of calorimeter = 1.30kg = 1300g

c = specific heat of calorimeter = 3.41 J/(g°C)

T₁ = initial temperature of calorimeter = 25.5°C

T₂ = final temperature of calorimeter = to find?

On putting all these values on the above equation and calculate for T₂, we get

T₂ = 24000/(1300)(3.41) + 25.5

T₂ = 30.9°C

Hence, correct option is (1) i.e. 30.9°C.

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Answer:

30.9

Explanation:

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