What is the molarity of a solution that contains 5.46 moles in 840 mL?
6.5
0 4.90
O 4586
O 0.0065
0 3.9
0 7.46

Answer:

Major functions of connective tissue include: 1) binding and supporting, 2) protecting, 3) insulating, 4) storing reserve fuel, and 5) transporting substances within the body. Connective tissues can have various levels of vascularity.

Explanation:

To Find :

How many moles of air are there in a 125 mL Erlenmeyer flask if the pressure is 755  mm Hg and the temperature is 20.0°C .

Solution :

Since, air contains different gas in different proportion.

Its average molar mass is considered to be 29 gram/mol .

Now, we know by ideal gas equation :

[tex]PV = nRT\\\\n = \dfrac{PV}{RT}[/tex]

Here, R is ideal gas equation, [tex]R = 62.363\ mm\ Hg\ L \ mol^{-1} \ K^{-1}[/tex]

Putting all given values we get :

[tex]n = \dfrac{755 \times 0.125}{62.363\times (20+273)}\ moles\\\\n = 0.00516 \ moles[/tex]

Hence, this is the required solution.

Answer:

A climate change

Explanation:

the surrounding area would be effected in all ways imaginable, such as change in air, soil, water, plants, animals. and if you eat those said animals those harmful things can transfur into you

Answer:

.-.

Explanation:

Answer:

Explanation:

When gas changes to liquid, it releases the thermal energy that has been absorbed before to become gas which does not alter the temperature at all. A reduction in energy changes the arrangement of particle. There spacing between the particles also increases but not as in a gaseous state and so does the kinetic energy. The particles now are now arranged in irregular pattern.

Answer:

0.474 moles

Explanation:

divide 10.62 by 22.4.

Answer: 185 grams

Explanation: First find out how many grams are in one mol: The molar mass es are taken from the periodic table, Ca is 40, O is 16, H is 1. There are 2 O and 2 H for (OH)2: 40+32+2= 74g/mol x 2.5 mol = 185 the moles cancel and you are left with grams

Answer:

y = 0.037 M = [O₂]

Explanation:

Let's write the equilibrium reaction:

2CO₂ <--------> 2CO + O₂      K = 2x10⁻⁶

The problem states that we have initially 15.95 mol of CO₂ in a 1.6 L  vessel. With this we can determine the concentration:

M = moles / V

[CO₂] = 15.95 / 1.6 = 9.97 M

Now, we need to write an ICE chart so we can have the equilibrium concentrations:

          2CO₂ <--------> 2CO + O₂      K = 2x10⁻⁶

I.         9.97                     0       0

C.         -2y                  +2y     +y

E.        9.97-2y              2y      y

K = [CO]² [O₂] / [CO₂]²            Replacing we have:

2x10⁻⁶ = (2y)² (y)² / (9.97 - 2y)²      But K is <10⁻⁴ so we can neglect the substraction of 9.97 - 2y, we have then:

2x10⁻⁶ = 4y² (y) / (9.97)²

2x10⁻⁶ * (9,97)² = 4y³

y = ∛2x10⁻⁶ * (9,97)² / 4

Hope this helps

It is true that if the subscript indicating the quantity of a particular element in an ionic formula would be one, the numerical value is omitted instead.

An ionic formula, also known as an ionic compound or salt, is a chemical compound that is composed of positively charged ions (called cations) and negatively charged ions (called anions) held together by ionic bonds. Ionic compounds typically form between a metal and a nonmetal, or between a metal and a polyatomic ion. The ionic formula is a representation of the chemical formula of an ionic compound. It shows the types and numbers of ions that are present in the compound. The cation is written first, followed by the anion, and the subscript for each ion is written to balance the charges. The total charge of the cations and anions must balance to zero in the ionic formula.

Here,

If the subscript indicating the quantity of a particular element in an ionic formula would be one, the numerical value is typically omitted, and the formula is written using only the symbols of the elements. This is because the presence of the element is implied by its symbol, and a subscript of 1 is unnecessary. However, when there is more than one atom of a particular element in the formula, the numerical subscript is required to indicate how many atoms are present.

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Answer:

The solubility of a solute becomes weaker and changes it’s solid state when heated because it causes the molecules to dissolve faster. If the solution was cooled, it would begin to regain its solid form as it’s molecules would be slowing down. I hope this helps!

Answer:

vinegar, soft drinks, seltzer water , citrus fruits

Explanation:

Explanation:

both b and c since it can be both

Answer:

Radio waves were first developed in WWII

Explanation:

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Answer:

C)12.09 Ampere

Explanation:

V= IR

Where I= current of the system

R= resistance= 0.67 ohm

V= potential difference=8.1 volts

Substitute the values

8.1= I× 0.67

I= 8.1/0.67

=12.09 Ampere

Answer:

The oxidation state of carbon in CaC204 is 3

Answer: The [tex]CO_{2}[/tex] gas occupies a space of 5.57 L at 26 Celsius and 101.75 kPa.

Explanation:

Given: Mass = 26 g

Pressure = 101.75 kPa

Convert kPa into atm as follows.

[tex]1 kPa = 0.00986923 atm\\101.75 kPa = 101.75 kPa \times \frac{0.00986923 atm}{1 kPa}\\= 1 atm[/tex]

Temperature = [tex]26^{o}C = (26 + 273) K = 299 K[/tex]

Now, moles of a substance is defined as mass of substance divided by its molar mass.

As molar mass of 2,2 dimethyl hexane is 114.23 g/mol. So, its number of moles are calculated as follows.

[tex]No. of moles = \frac{mass}{molar mass}\\= \frac{26}{114.23 g/mol}\\= 0.227 mol[/tex]

Formula used to calculate the volume is as follows.

PV = nRT

where,

P = pressure

V = volume

n = no. of moles

R = gas constant = 0.0821 L atm/mol K

T = temperature

Substitute the values into above formula as follows.

[tex]PV = nRT\\1 atm \times V = 0.227 mol \times 0.0821 L atm/mol K \times 299 K\\V = 5.57 L[/tex]

Thus, we can conclude that the [tex]CO_{2}[/tex] gas occupies a space of 5.57 L at 26 Celsius and 101.75 kPa.

Answer:

drying up

agricultural chemicals

Explanation:

Answer: A galvanic cell consists of two different metals (electrodes) connected through a conducting solution (an electrolyte) and also connected externally completing a circuit.

17 × ( 2 × 16 ) = 17 × 32 = 544 grams

___________________________

Copper is a conductor because its valence electron can move freely from atom to atom. Option (B) is correct answer.

Insulator is a material which does not conduct any current. Non metals are insulators. Electrons do not move freely in insulator. Thermal conductivity of insulator very is low and its resistance is vey high. These are used in making insulating electrical equipment.

Conductor is a substance which allow the electricity to flow through it. Metals are conductors. Electron can move freely in conductors. Thermal conductivity of conductor is very high and its resistance is vey low. These are used in making the electrical equipment.  

Now let check all options one by one:

Option (A): Copper is a conductor not an insulator. Copper is a metal and it consists free electrons and electron can move freely from one atom to another atom.

So, option (A) is incorrect.

Option(B): Copper is a conductor because its valence electron can move freely from atom to atom. As copper is a metal it is a good conductor of electricity. The thermal and electrical conductivity of copper is high.

So, option (B) is correct.

Option (C): Copper is not an insulator it is conductor as already discussed in option (A).

So, option (C) is also incorrect.

Option (D): Copper is a conductor because its electron can move freely and it is a good thermal conductor.

So, option (D) is also incorrect.  

Thus, from above conclusion we can say that Copper is a conductor because its valence electron can move freely from atom to atom.

Hence, option (B) is correct answer.

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Answer:

Rubbing the match against a rough surface

The activation energy is provided by friction between surfaces

Explanation:

Activation energy is the energy required to start a chemical reaction. It is the minimum energy that must be supplied for a reaction to proceed.

When we strike a match against a rough surface, what we are trying to do is to supply the required activation energy in the form of friction in order to get the combustion reaction started.

Hence, the activation energy for the combustion of a match head is supplied by friction when the match head is struck against a rough surface.

Answer:

A-Metals

Explanation:

because they have valence electrons

Answer:

OB

Explanation:

tht is correct make me brainliest

Answer:

its a little bit long but= The most obvious result of the removal of the top predators in an ecosystem is a population explosion in the prey species.More predators kill more prey, which, along with food scarcity, decreases the population. When prey becomes more scarce, the predator population declines until prey is again more abundant.

I believe that the answer is A.

The combination of potassium (K) and oxygen (O2) produces K2O (potassium oxide). The balanced equation is 2K + O2 ==> K2O.

Answer:

132.53 J/kg.°C

Explanation:

Applying,

Q = cm(t₂-t₁)................ Equation 1

Where Q = amount of heat, c = specific heat capacity of platinum metal, m = mass of platinum metal, t₁ = initial temperature, t₂ = Final temperature.

Make c the subeject of the equation

c = Q/m(t₂-t₁).............. Equation 2

From the question,

Given: Q = 5.7 J. m = 18.7 g = 0.0187 kg, t₁ = 21.2°C, t₂ = 23.5°C

Substitute these values into equation 2

c = 5.7/[0.0187×(23.5-21.2)]

c = 5.7/0.04301

c = 132.53 J/kg.°C

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