How can you demonstrate the helium takes up space?

Answer:

There are four laws of thermodynamics that define fundamental physical quantities (temperature, energy, and entropy) and that characterize thermodynamic systems at thermal equilibrium.

Explanation:

Answer:

the science that deals with the properties, composition, and structure of substances they undergo, and the energy that is released or absorbed during these processes.

Explanation:

Answer:

Is the scientific branch that deals with the composition and decomposition of elements and compounds in nature

Answer:

Explanation:

The new volume can be found by using the formula for Boyle's law which is

[tex]P_1V_1 = P_2V_2[/tex]

From the question we have

[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]

From the question we have

[tex]V_2 = \frac{40 \times 20}{80} = \frac{800}{80} = 10 \\ [/tex]

We have the final answer as

hope this helps you

Answer:

calcium oxide

Explanation:

its stable

There are several metals which can be used to reduce the metal oxides to corresponding metals. Carbon is an efficient reducing agent. Here Calcium oxide cannot be reduced to calcium by carbon. The correct option is C.

The reaction of metals with oxygen result in the formation of oxygen containing compounds called metal oxides. The binary compounds of oxygen with lesser electronegative elements are called oxides. Most of the stable oxides have 'O' in its -2 oxidation state. Na₂O, CO₂, etc. are some oxides.

Carbon is a reducing agent and it is present above the elements like 'Zn', 'Cu', 'Fe', 'Ag', etc. in the electrochemical series. But the oxides of highly reactive metals cannot be reduced with carbon. Because these metals have more affinity for oxygen than carbon.

The highly reactive metals are extracted by using the electrolytic reduction of their molten chloride. It is not possible for carbon to reduce the oxides of metals like 'Na', 'Ca', 'Al', etc.

Thus the correct option is C.

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Answer:

3

Explanation:

2+2=4-1=3 quick maths

Answer:

C) Electrons will reside closer to chlorine, and the bond will be polar

Explanation:

Electrons tend to be closer or attracted to high electronegativity and sulfur has less electronegativity than chlorine. Therefore, electrons will reside closer to chlorine. To find out if it is polar or nonpolar, according to the electronegativity chart you can find online, you can see that the electronegativity of sulfur is 2.5 while the electronegativity of chlorine is 3.0. Because the difference between these two is a slight change, it would be slightly polar. So, the bond will be polar.

Answer:

Electrons will reside closer to chlorine, and the bond will be polar.

Explanation:

Answer:

Magnesium is limiting reactant.

Explanation:

Based on the reaction:

Mg + H₂SO₄ → MgSO₄ + H₂

1 mole of Mg reacts per mole of sulfuric acid

To find limiting reactant we need to convert mass of magnesium to moles. If moles of Mg > moles sulfuric acid, sulfuric acid is limiting reactant and vice versa.

Moles Mg -Molar mass: 24g/mol-:

48g Mg * (1mol / 24g) = 2moles

As there are just 2 moles of Magnesium, just 2 moles of H₂SO₄ will react and 3 moles will remain. That means:

Answer:

In the northern hemisphere I believe, Scorpius is most visible by looking to the south during July and August around 10:00 PM. The constellation remains visible until mid-September. In the southern hemisphere, Scorpio appears very high in the northern part of the sky until close to the end of September.

Answer:

October 23 to November 21

Explanation:

Not entirely sure what you are asking. . .

If we're talking Scorpius as in:

Scorpius is one of the constellations of the zodiac and is located in the Southern celestial hemisphere. Its name is Latin for scorpion, and its symbol is. (Unicode ♏).

Answer:

0.045 moles

Explanation:

Given data:

Moles of CO = ?

Volume of gas = 1 L

Temperature and pressure = standard

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

n = PV/RT

n = 1 atm× 1L / 0.0821 atm.L/mol.K × 273 K

n = 1 atm.L / 22.41 atm.L/mol

n = 0.045 mol

Answer:

yolo go with C

Explanation:

Answer:

plastic

Explanation:

Answer:

Answers

1.)reactants: nitrogen and hydrogen; product: ammonia.

2.)reactants: magnesium hydroxide and nitric acid; products: magnesium nitrate and water.

3.)N 2 + 3H 2 → 2NH 3

4.)Mg(OH) 2 + 2HNO 3 → Mg(NO 3) 2 + 2H 2O.

5.)2NaClO 3 → 2NaCl + 3O 2

6.)4Al + 3O 2 → 2Al 2O 3

7.)N 2(g) + 3H 2(g) → 2NH 3(g)

Explanation:

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A chemical reaction is a process in which atoms are rearranged to form new molecules or substances. During a chemical reaction, chemical bonds are broken and formed, resulting in the transformation of reactant molecules into product molecules. The reactants and products of a chemical reaction are characterized by their chemical formulas, which describe the types and numbers of atoms present in the molecules.

A balanced chemical equation is a written representation of a chemical reaction that shows the reactants on the left side of the equation and the products on the right side. The equation is balanced by adjusting the coefficients (the numbers in front of the chemical formulas) so that the number of atoms of each element is the same on both sides of the equation. This ensures that the law of conservation of mass is obeyed, which states that matter cannot be created or destroyed during a chemical reaction.

There are several types of chemical reactions, including:

Decomposition reactions: These reactions involve the breakdown of a single compound into two or simpler substances. An example of a decomposition reaction is the thermal decomposition of water to form hydrogen and oxygen gases:

2H2O (l) -> 2H2 (g) + O2 (g)

Displacement reactions: These reactions involve the replacement of one element with another element in a compound. An example of a displacement reaction is the reaction of zinc with hydrochloric acid to form zinc chloride and hydrogen gas:

Zn (s) + 2HCl (aq) -> ZnCl2 (aq) + H2 (g)

Redox reactions: These reactions involve a transfer of electrons from one species to another. An example of a redox reaction is the reaction of magnesium with oxygen to form magnesium oxide:

2Mg (s) + O2 (g) -> 2MgO (s)

Combination reactions: These reactions involve the combination of two or more substances to form a single compound. An example of a combination reaction is the reaction of hydrogen and oxygen to form water:

2H2 (g) + O2 (g) -> 2H2O (l)

Acid-base reactions: These reactions involve the transfer of a proton from an acid to a base. An example of an acid-base reaction is the neutralization of hydrochloric acid with sodium hydroxide to form water and sodium chloride:

HCl (aq) + NaOH (aq) -> H2O (l) + NaCl (aq)

It takes 21.3 days

Given

5 hr = 8 kg Alcohol

Required

Days to consume 1000 kg of glucose

Solution

Alcoholic fermentation⇒ glucose produces ethanol and carbon dioxide,

C₆H₁₂O₆ → 2 C₂H₅OH + 2CO₂

mol ethanol :

[tex]\tt \dfrac{5000~g}{46~g/mol}=108.7~moles[/tex]

moles of glucose to produce 108.7 moles ethanol :

[tex]\tt \dfrac{1}{2}\times 108.7=54.35[/tex]

54.35 moles = 5 hours

moles of 1000 kg of glucose :

[tex]\tt \dfrac{10^6~g}{180~g/mol}=5555.5~moles[/tex]

So for 5555.5 moles, it takes :

[tex]\tt \dfrac{5555.5}{54.35}\times 5~hours=511.085~h=21.3~days[/tex]

Answer:

c

Explanation:

Answer:

Hi! It's B - globular cluster

Answer:

B Globular Cluster

Explanation:

Sorry if I am wrong :)

Answer:

The reaction has a high activation energy

Explanation:

The burning of methane is a spontaneous reaction. Once the burning begins, the flame is able to sustain itself without any additional input of energy. It is an exothermic reaction in which energy is given out in the form of heat.

The reason why heat from the match is needed to start the burning of methane is that the activation energy of the combustion of methane is high. Activation energy is the energy that must be supplied in order for the collision of reactants to result in chemical reaction.

As long as the activation energy is high, the reaction can not occur without an external input of energy (e.g striking a match). Hence the answer.

Answer: 40cm^3

Explanation:

Since the The air today is approximately one-fifth oxygen, the approximate volume of oxygen in 200cm3 of air would be:

= 1/5 × 200

= 40cm

The answer is 40cm^3

Answer:In the first law, an object will not change its motion unless a force acts on it. In the second law, the force on an object is equal to its mass times its acceleration. In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction

Explanation:

Answer:

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Explanation:

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Answer:

Explanation:

Using the formula as follows: mole = mass/molar mass

Molar mass of Ba(NO3)2

= 137 + (14 + 48)2

= 137 + 124

= 261g/mol

Mole = mass ÷ molar mass

0.625 mol = mass/261g/mol

mass = 0.625 × 261

mass = 163g

Answer 12.2g is the answer

Answer:

synthesis reaction

Explanation:

A + X --> AX

Answer:

Combustion reaction

Explanation:

Answer:

the density of an object determines whether it will sink or float

Answer:

Its B,C,E

Explanation:

Answer:

Look at the image provided and try work it out. I don't have the time but I hope I helped you!

Explanation:

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

mass = Density × volume

From the question we have

mass = 3.66 × 270

We have the final answer as

Hope this helps you

Answer:

In a synthesis reaction, two or more chemical species combine to form a more complex product.

Explanation: