How a reaction between colorless substances can produce a colored precipitate

Answer:

the temperature of the system decreases

First and fifth reaction shows endothermic reaction while the rest of it shows exothermic reaction.

The reaction between ammonium nitrate and water is an example of endothermic reaction because it absorbs heat from the surrounding environment.

Three drops of concentrated sulfuric acid added to 100 milliliters of water in a beaker makes the beaker hot because exothermic reaction occur.

Ammonium chloride dissolved in a beaker of water makes the beaker cold which shows that it is exothermic reaction because heat leaves the solution.

Uranium atoms are split to produce nuclear energy is an example of exothermic reaction.

Water separates into hydrogen and oxygen when an electric current is run through it that shows endothermic reaction.

Methane and oxygen are combined to produce methanol and heat is an example of exothermic reaction.

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Answer:

a. 1810mL

Explanation:

When conditions for a gas change under constant pressure (and the number of molecules doesn't change), it follows Charles' Law:

[tex]\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]  where the temperatures must be measured in Kelvin

To convert from Celsius to Kelvin, add 273, or use the equation:  [tex]T_C+273=T_K[/tex]

For this problem, one must also recall that standard temperature is 0°C (or 273K).

So, [tex]T_1 = 273[K][/tex], and [tex]T_2 = (49.4+273)[K]=322.4[K][/tex].

[tex]\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]

[tex]\dfrac{(1532.7[mL])}{(273[K])}=\dfrac{V_2}{(322.4[K])}[/tex]

[tex]\dfrac{(1532.7[mL])}{(273[K\!\!\!\!\!{-}])}(322.4[K\!\!\!\!\!{-}] )=\dfrac{V_2}{(322.4[K]\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{----})}(322.4[K]\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{----})[/tex]

[tex]1810.04571428[mL]=V_2[/tex]

Adjusting for significant figures, this gives [tex]V_2=1810[mL][/tex]

Answer:

empirical formula is the simplest formula of a compound with 4.433g phosphorus and 5.717g ooxygen.

From the calculation, the pH of the solution after dilution is 3.

The pH is the hydrogen ion concentration of the solution. Now we know that;

C1 =  0.010 m

V1 = 10.0 ml

V2 = 10.0 ml + 100.0 ml = 110 ml

C2 = ?

C1V1 = C2V2

C2 = C1V1 /V2

C2 =  0.010 m  * 10.0 ml / 110 ml

C2 = 0.00091 M

pH = -log[0.00091 M]

pH = 3

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Explanation:

NaCl is the compound that we want to know the Bonding structure of

in chemistry when a metal (Na) combines with a non metal (Cl) it is know as an ionic compounds

the type of bonding in ionic compounds is an ionic bond

Number of calories that are in a banana containing 410 kJ of energy are 97619.04 Calories.

The ability to do work is called as energy. Work done is product of force and displacement. Energy is of different types as sound energy, kinetic energy, potential energy, electrical energy, light energy etc.

Law of conservation of energy states that energy can neither be created nor destroyed, but it can be transferred from one form to another.

Molecules can move so they show kinetic energy, molecules can be there at many positions so they can show potential energy, molecules can vibrate so they can show sound energy but molecules can only absorb light hence they can't have light energy.

1 calorie of energy has 0.0042 Kilo Joules.

97619.04 Calories of energy will be present in 410 KJ.

Therefore, Number of calories that are in a banana containing 410 kJ of energy are 97619.04 Calories.

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Explanation:

Distillation is the separation of mixture of two liquids which differ in boiling point. Through Distillation vapour that is formed spread thoroughly in our environment

Answer:

Its because non-metals are unable to break the bond between the H and O ion and cannot reduce hydrogen by donating electrons

2.258302785 x [tex]10^{23}[/tex] atoms of titanium are present in a sample containing 0.375 moles of Ti.

A mole is defined as 6.02214076 × 10^{23} of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

To find the number atoms we need to multiply by 6.02214076 × 10^{23}.

0.375 moles x  6.02214076 × [tex]10^{23}[/tex]

2.258302785 x [tex]10^{23}[/tex]

Hence, 2.258302785 x [tex]10^{23}[/tex] atoms of titanium are present in a sample containing 0.375 moles of Ti.

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The kinetic energy decreases as potential energy increases. Hence, option C is correct.

Potential energy is stored energy that depends upon the relative position of various parts of a system.

As the target is fired high on the wall, the change in the energy that is observed as the arrow moves toward the target is kinetic energy starts to decrease as the arrow reaches nearer to the target and the potential energy is observed to increase.

So, in short, the energy transformation is from kinetic energy from a moving arrow to potential energy when the arrow hits the target.

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The temperature of 0.049 moles of a Ne with a pressure of 1.00 atm and a volume of 2.50 L is 621.44K.

The temperature of a given gas can be calculated using the ideal gas law equation:

PV = nRT

Where;

P = pressure = 1.00 atm

V = volume =2.50 L

R = gas law constant = 0.0821 Latm/molK

Mass =1.00 gram

The molar mass of Ne= 20.1797 u

[tex]Moles = \frac{mass}{molar \;mass}[/tex]

[tex]Moles = \frac{1.00}{20.1797}[/tex]

Moles = 0.049mol

T = temperature=?

Putting the value in the equation:

PV = nRT

1.00 atm × 2.50 L = 0.049mol × 0.0821 × T

T = 621.44K

Therefore, the temperature of 0.049 moles of a Ne with a pressure of 1.00 atm and a volume of 2.50 L is 621.44K.

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Taking into account the reaction stoichiometry, 2 moles of Na₃PO₄ can be produced when 6.0 mol NaOH reacts with 9.0 mol H₃PO₄.

In first place, the balanced reaction is:

3 NaOH + H₃PO₄ → 3 H₂O + Na₃PO₄

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:

The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.

To determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 1 mole of H₃PO₄ reacts with 3 moles of NaOH, 9 moles of H₃PO₄ reacts with how many moles of NaOH?

[tex]moles of NaOH=\frac{9 moles of H_{3} PO_{4} x3 moles of NaOH}{1 mole of H_{3} PO_{4}}[/tex]

moles of NaOH= 27 moles

But 27 moles of NaOH are not available, 6 moles are available. Since you have less moles than you need to react with 9 moles of H₃PO₄, NaOH will be the limiting reagent.

Considering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 3 moles of NaOH form 1 mole of Na₃PO₄, 6 moles of NaOH form how many moles of Na₃PO₄?

[tex]moles of Na_{3}P O_{4} =\frac{6 moles of NaOHx1 mole of Na_{3}P O_{4} }{3 moles of NaOH}[/tex]

moles of Na₃PO₄= 2 moles

Then, 2 moles of Na₃PO₄ can be produced when 6.0 mol NaOH reacts with 9.0 mol H₃PO₄.

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Answer:

The first one is 2 but the second one is 9

Explanation:

Answer:

104 f

Explanation:

multiply 40 by 1.8 and then add 32

Answer: a. hydrogen

This is a fact.

Carbon is the reference taken to assign the atomic mass unit

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Answer:

Explanation:

Using Intersecting Chords Theorem,

AB × CB = BE × BD

The mass, in grams, of sodium chloride needed would be 27.29 grams.

The number of moles of a substance is mathematically given as:

Mole = mass/molar mass.

Thus, mass = mole x molar mass.

In this case, 0.467 moles of NaCl is needed. The mass of 0.467 moles of NaCl can then be calculated as:

Mass = 0.467 x 58.44 = 27.29 grams.

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Answer:

Hydrochloride acid + Zinc = Zinc Chloride + Hydrogen

Explanation:

When Hydrochloride acid and Zinc react, it results in the formation of Zinc chloride and hydrogen.

Hope I helped

Standard enthalpy change refers to a change in the amount of energy in a reaction that occurs under standard conditions.

It is a property that measures the change in the amount of energy in a reaction involving the formation of substances from pure elements.

Such a reaction must happen under standard conditions which include 1-atmosphere pressure and 298.15 K temperature.

It is designated by  ΔH°.

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Answer:

OH-(aq)+H+(aq)->H2O(l)

Answer is shown in photo.

Explanation :

APEX

The changes in different properties such as concentration etc will change if the pH experiences a change.

This is referred to the power of hydrogen and is a measure of the degree of acidity or alkalinity of a substance.

When pH changes, the concentration as well as other properties in this context.

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Answer:

The answer will be false.

Explanation:

because it is not balanced.

Answer: d. both (b) and (c)

Explanation:

Atoms are too small to be seen on microscopes, so we model them based on theories.

The molarity of the sodium ion in the solution is 0.450 M.

The molarity of the sodium ion in a solution can be determined by the dissociation of the given solution Na2SO4(sodium sulfate).

The dissociation of Na2SO4 is computed as follows:

i.e.

[tex]\mathbf{Na_2SO_4 \to 2Na^{+} + SO_4^{2-}}[/tex]

The molarity for sodium-ion [Na+] is:

= 2 × 0.225 M

= 0.450 M

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Answer:

V₂ = 167 cm₃

Explanation:

Because you are only dealing with volume and temperature, you can use Charles' Law to find the missing value. This formula looks like this:

V₁ / T₁ = V₂ / T₂

In this formula, "V₁" and "T₁" represent the initial volume and temperature. "V₂" and "T₂" represent the final volume and temperature. You have been given values for all of the variables except for final volume. Therefore, by plugging these values into the formula, you can simplify to find your answer.

V₁ = 100 cm³             T₁ = 150 °C

V₂ = ?                        T₂ = 250 °C

V₁ / T₁ = V₂ / T₂                                          <---- Charles' Law formula

(100 cm³) / (150 °C) = V₂ / (250 °C)           <---- Insert values

(0.667) = V₂ / (250 °C)                               <---- Simplify left side

(0.667) x (250 °C) = V₂                              <---- Rearrange

167 = V₂                                                     <---- Simplify left side

SF₆

Molar mass: 146.06 g/mol

mole = 25 : 146.06 = 0.171

molecules:

=0.171 x 6.02 x 10²³

=1.03 x 10²³

1 mole is equal to 6.0220 x 1023 atoms of any element.

2)A complete desktop uses an average of 200 Watt hours (Wh). This is the sum of the average consumption per hour of the computer itself (171 W), the internet modem (10 W), the printer (5 W) and the loudspeakers (20 W). Assuming that a computer is on for eight hours a day, the annual consumption comes to 600 kWh. That corresponds to CO2 emissions of about 175 kg per year, i.e. 1.75 % of the average annual emission of a Belgian.

Answer:

the pro on and the electron