Select all the correct answers.
What does an increase in the temperature of air indicate?

Answer:

The correct option is B

Explanation:

just did it edg 2020.

Answer:

the answer is c

Explanation:

Answer:

TRUE

Explanation:

It is true because along with energy, nuclear fusion releases other particles as well. This can include neutrons or atomic nuclei. An example of this is when hydrogen isotopes (D + T) fuse together to create helium it also releases a neutron. Thus D+T --> He + n + energy.

Therefore the answer is TRUE.

Answer:

A) HBr

b) NaCl

c) I2

d) N2

e) CH4

f) HF

Explanation:

a) HBr has the highest boiling point because its molecules are held by intermolecular hydrogen bonding unlike other compounds listed.

b) the freezing point of a substance is the same as its melting point. Ionic substances have the highest melting points. Hence NaCl has a melting (freezing) point of about 801°C

c) vapour pressure depends on molecular mass. The higher the molecular mass the lower the vapour pressure. I2 has the highest relative molecular mass and hence the lowest vapour pressure.

d) The molecule with the lowest molecular mass is expected to have the lowest intermolecular dispersion forces and hence the lowest freezing point.

e) Degree of dispersion forces and boiling point increases with increase in molecular mass. Since CH4 has the lowest molecular mass, it will also possess the lowest boiling point.

e) The magnitude of electro negativity decreases down the group. Hence, fluorine is the most electronegative element among the halogens. Hydrogen bonding results when hydrogen is covalently bonded to an electronegative element. The strength of the hydrogen bonding depends on the electro negativity of the electronegative element.

For hydrogen halides, HF has the highest boiling point since F is the most electronegative halogen and HF possess the greatest degree of hydrogen bonding among the hydrogen halides. Hydrogen bonding leads to increase in boiling point of substances.

The intermolecular forces in the compound have been responsible for the various properties of the compounds.

(a) Highest boiling point:

The hydrogen bonding has resulted from the electrostatic interaction of the H with the more electronegative atom. The strong interaction results in a higher boiling point.

HBr has consisted of the hydrogen bond, thus having the highest boiling point.

(b) Highest freezing point:

The higher hydrogen bonding in the structure results in a high freezing point. The ionic compounds with electrostatic interactions result in a high freezing point.

NaCl has been an ionic compound, thus has been consisted of the highest freezing point.

(c) Lowe vapor pressure:

Vapor pressure has been inversely proportional to the molecular mass. The higher the molecular weight, the lower has been the vapor pressure.

Iodine has the highest molecular weight, thereby has the lowest vapor pressure.

(d) Lowest freezing point:

Based on the molecular weight, the lower the molecular weight, the lower has been the freezing point of the molecule.

The [tex]\rm \bold{CH_4}[/tex] has the lowest molecular weight, thus the lowest freezing point.

(e) Highest boiling point:

The more electronegative atom in the hydrogen bonding, the higher has been the stability and the higher the boiling point.

HF has the highest boiling point as it has H bonded with the most electronegative element.

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Answer:

A. Hydrosphere

Explanation:

Hydro means water and dolphins swim in water.

I hope this helps :)

Answer:

an atom or molecule with a net electric charge due to the loss or gain of one or more electrons

Answer:

D) two unhybridized p orbitals

Explanation:

In covalent bond, to form a bond, each of the two participating atoms would put down an  unpaired electron to be used in forming a shared pair of electrons between them.

There are two types of covalent bonds:

A sigma bond [tex]\sigma[/tex]

A pi bond [tex]\pi[/tex]

A sigma bond is formed when a hybrid orbital (sp,sp² and sp³) overlaps with another hybrid orbital or with s- or p- orbital.

A pi bond is formed when a p-orbital overlaps with another parallel p-orbital laterally. This implies that ,a  π bond could be formed from the overlap of two unhybridized p orbitals.

Answer:

i) increase

ii) decrease

iii) remain the same

iv) No, because it dissociates completely.

Explanation:

On a 10-fold dilution of a weak acid, the pH will increase because the concentration of hydrogen ions will decrease thereby increasing the pH to close to that of water.

On a 10-fold dilution of a weak base, the pH will decrease due to the removal of hydroxide ions from the solution. This results in the solution having a H closer to that of water.

If one adds a very small amount of strong base to a buffered solution, the pH will remain constant because a buffer solution acts to withstand any change to its pH on the addition of small quantities of either an acid or a base.

A buffer solution cannot be made with a strong acid because thy undergo complete dissociation. Therefore, any small addition of base or acid will result in very large changes in the pH of the solution. A buffer solution is made with a weak acid and its conjugate base or a weak base and its conjugate acid.

Answer:

Matter is composed of exceedingly small particles called atoms. An atom is the

smallest unit of an element that can participate in a chemical reaction.

Answer:

Chemical reaction.

Explanation:

Answer:

Here's what I get  

Explanation:

You haven't shown your drawing, so I will assume that Metal A is the anode and Metal B is the cathode.

I will make a galvanic cell using Mg and Zn as the metals.

I selected Zn because it is common and readily available in the lab.

Zn is lower than Mg in the activity series, so Mg should be able to displace Zn from its salts

The standard reduction potentials are:

                                         E°/V

Zn²⁺ (aq) + 2e⁻ ⇌ Zn(s);  -0.76

Mg²⁺(aq) + 2e⁻ ⇌ Mg(s); -2.38

The Mg half-reaction has the more negative potential, so it will be the oxidation half-reaction.

8 and 9. Oxidation and reduction half-reactions and cell potential

                                                                                   E°/V

Oxidation:  Mg(s) ⇌ Mg²⁺(aq) + 2e⁻ ;                      +2.38

Reduction: Zn²⁺ (aq) + 2e⁻ ⇌ Zn(s);                         -0.76

                   Mg(s) + Zn²⁺ (aq)  ⇌ Mg²⁺(aq) + Zn(s);  +1.62

The cell potential is positive, so the reaction will be spontaneous.

Mg is the anode, so it is Metal A.

Zn is the cathode, so it is Metal B.

1. The Mg|Mg²⁺ half-cell is the oxidation compartment.

2. The Zn²⁺|Zn half-cell is the reduction compartment.

3. The electrons flow from anode to cathode in the external circuit.

4. The Mg²⁺ ions flow from the Mg through the solution to the salt bridge.

5. The Zn²⁺ ions flow from the solution to the Zn.

6. NO₃⁻ ions flow from the salt bridge into the anode compartment to balance the charge of the developing Zn²⁺ ions.

7. Na⁺ ions flow from the salt bridge into the cathode compartment to replace the charge of the depleted Zn²⁺ ions.

Answer:

Final temperature (T) = 44.22°C (Approx)

Explanation:

Given:

Mass of Y (m) = 16.2 gram

Energy required (q) = 2722 J

Specific heat of the substance(c) = 9.22 J/g·°C

Change in temperature ΔT = T - 26°C

Find:

Final temperature (T)

Computation:

q = mcΔT

2722 = (16.2)(9.22)(T - 26°C)

18.224 = T - 26°C

T = 26 + 18.224

T = 44.224°C

Final temperature (T) = 44.22°C (Approx)

Answer:

pH>7

sour taste

donate H+ ions

turn litmus paper from blue to red

Explanation:

Answer:

Explanation:

   pH < 7.

   Sour taste (though you should never use this characteristic to identify an acid in the lab)

   Reacts with a metal to form hydrogen gas.

   Increases the H+ concentration in water.

   Donates H+ ions.

   Turns blue litmus indicator red.

Explanation:

1. Displacement of hydrogen from water by using metal

2. Electrolysis of water using the apparatus known as the HOFMAN VOLTAMETER

3. Cracking of petroleum

4. Action of steam on hot coke

Answer:

441

Explanation:

In particle model A are the red and blue particles MOST LIKELY to bump into each other and the correct option is option A.

The particle model of matter is a theory that explains how the particles that make up a substance are arranged, and how they move and interact with each other.

The particle model explains the properties of solids, liquids and gases. The particle model can explain changes of state.

Particles of matter have spaces between them. Atoms and molecules have spaces between them. In a gas, there are large spaces between them. In a a liquid they are closer together. In a solid, the particles are packed close enough together they can hardly move.

Therefore, In particle model A are the red and blue particles MOST LIKELY to bump into each other and the correct option is option A.

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Answer:

option d

Explanation:

isotope means atoms with different mass no. 17 and 18 written on the left represent mass number

this is because atoms can differ in mass no.

Explanation:

Cyclopropane is a cycloalkane conposed of three carbon atoms to form a ring. It has a rols as an inhalation anaesthetic. It is a cycloalkane and a member of cyclopropanes.

Answer:

Alkane

Explanation:

Answer:

balancing of charges of both sides

Answer:

A

Explanation:

A...............................

Answer:

A.

Explanation:

Higher temperature - more kinetic energy - more space between particles - higher volume.

Answer:

pH = 0.984

Explanation:

Molarity LiOH = 2.1x10⁻²M

HCl will react with LiOH as follows:

HCl + LiOH → H₂O + LiCl

1 moles of HCl reacts per mole of LiOH

Moles of each reactant in solution are:

HCl = 0.477L ₓ (0.17mol / L) = 0.08109 moles HCl

LiOH = 0.253L ₓ (2.1x10⁻² mol / L) = 5.313x10⁻³ moles of LiOH.

That means LiOH is the limiting reactant and excess moles of HCl that will remain in solution are:

0.08109 mol - 0.005313mol = 0.0758 moles HCl

As HCl dissociates in water as H⁺ and Cl⁻ ions, you will have in solution 0.0758 moles of H⁺

pH = -log [H⁺] and [H⁺] = moles H⁺ / L of solution.

Volume of the mixture in liters is: 0.477L + 0.253L = 0.730L.

That means [H⁺] is 0.0758 moles of H⁺ / 0.730L = 0.1038M

Replacing:

pH = -log [H⁺]

pH = -log [0.1038]

Answer:

A

Explanation:

Answer:

10

Explanation:

Example:

10 · 10 = 100

60 · 10 = 600

Answer:

you multiply by 10.

Explanation:

10 - the one is in the thenth place

10 * 10 = 100 - the one is in the hundreth place

20 - the two is in the thenth place

20 * 10 = 200 - the two is in the hundreth place

Answer:

The correct option is;

b.Chemical bond

Explanation:

Chemical bonds are the attractive forces holding the atoms within a compound together. The concept of chemical bonding is fundamental to the explanation of chemical phenomena including reaction mechanism and molecular behavior

There are different chemical bonds such as ionic bonds formed by the attraction of oppositely charged ions, covalent bonds, formed by the sharing of electrons and polar covalent bonds.

Answer:

One factor that affects that affects the direction of the current is the direction of motion of the wire

Explanation:

According to Fleming's right hand rule when a conductive wire which is within a circuit is moved through a magnetic field, due to Faraday's law of electromagnetic induction an electric current is induced in the wire such that the direction of motion of the wire, the direction of the magnetic field and the direction of the electric current are perpendicular to each other such that if the right hand has the thumb middle finger and the index finger held perpendicular to each other

The motion of the wire being in the direction of the wire

The first or index finger points in the direction of the magnetic field

The middle finger points in the direction of the induced electric current

Therefore, the direction of the the current depends on the direction of motion of the wire.

Answer:

Rb

Explanation:

This is because they are in the same group which means they share similar properties.

What do rubidium and cesium have in common?

This family consists of the elements lithium, sodium, potassium, rubidium, cesium, and francium (Li, Na, K, Rb, Cs, and Fr, respectively). Group one elements share common characteristics.

What are the physical and chemical properties of caesium?

It is silvery gold, soft, and ductile. It is the most electropositive and most alkaline element.

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Answer:

d

Explanation:

i got it right

Gas A is likely to have the lowest temperature.  Hence, option A is correct.

The smallest particle of a substance has all of the physical and chemical properties of that substance. Molecules are made up of one or more atoms.

In a gas, the kinetic energy is directly proportional to the temperature under constant pressure and volume.

As you can see in the problem, the average of A has low kinetic energy. But the average is increasing between B, C and D.

As gas A has the lowest average kinetic energy:

Gas A is likely to have the lowest temperature

Hence, option A is correct.

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Answer:

325 g/L,

0.9503 M

Explanation:

65 g sugar --- 0.2 L

x g              ---  1 L

x = 65/0.2 g/L = 325 g/L

Sugar(sucrose) is C12H22O11.

Molar mass (C12H22O11) = 12*12 + 1*22 + 16*11 = 342 g/mol

325 g/L * 1 mol/342 g = 0.9503 mol/L = 0.9503 M

Answer 0.6398(M) is not related to sugar (sucrose),

it should be given formula or molar mass of sugar if it is different than sucrose.

Answer: The rate constant is the reaction rate divided by the concentration terms.

It has a double C=C bond so that means it's unsaturated, but it can also be a cyclic compound with only simple C-C bonds

Alkene

I did the test

Answer:

the neutralization reaction occurs