Choose 2 of the above examples and explain why you chose chemical or
physical. Please choose one of each type of change. Back up your explanation.

Answer:

2.4 H[tex]x^{2}[/tex]

Explanation:

Answer:

122 forenhieght

Explanation:

(50°C × 9/5) + 32 = 122°F

Answer:

Density is 0.34

Explanation:

D=m/V

Density is equal to mass divided by volume.

so 8.7 divided by 25.4 is equal to 0.34. The density of that object is 0.34

Answer:

The trans/trans stereoisomer.

Explanation:

So, we are going to have two stereoisomers or arrangements for this chemical compound, that is the Cis/trans, the trans/trans.

For a compound to be seen with UV, the main or primary condition is conjugation or how conjugated the chemical specie or compound is.

Thus, the more the conjugation, the more or the higher the wavelength or lands value.

=> The Trans/trans stereoisomer will have the highest lamda value or wavelength because the energy gap in its π - π* Transitioning deceases due to the STERIC interactions, and the more the decrease in the energy gap, the more or the higher the lamda value or wavelength.

it represents the maximum population size a particular environment can support

The pH of the solution in which one normal adult dose aspirin is dissolved is :  2.7

Given data :

mass of aspirin = 640 mg = 0.640 g

volume of water = 10 ounces = 0.295735 L

molar mass of aspirin = 180.16 g/mol

moles of aspirin = mass / molar mass = 0.00355 mol

First step : calculate the concentration of aspirin

= moles of Aspirin / volume of water

= 0.00355 / 0.295735

= 0.012 M

Given that pKa of Aspirin = 3.5

pKa = -logKa

therefore ; Ka = [tex]10^{-3.5}[/tex] = [tex]3.162 * 10^{-4}[/tex]

From the Ice table

[tex]3.162 * 10^{-4}[/tex] = [tex]\frac{x + H^+}{[aspirin]}[/tex]  = [tex]\frac{x^{2} }{0.012-x}[/tex]

given that the value of Ka is small we will ignore -x

x² = [tex]3.162 * 10^{-4} * 0.012[/tex]

x = [tex]1.948 * 10^{-3}[/tex]  

Therefore

[ H⁺ ] = [tex]1.948 * 10^{-3}[/tex]

given that

pH = - Log [ H⁺ ]

     = - ( -3 + log 1.948 )

     = 2.71 ≈ 2.7

Hence we can conclude that The pH of the solution in which one normal adult dose aspirin is dissolved is :  2.7

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Answer:

Nitrogen is the limiting reactant, and 3.74

grams of ammonia is formed.

Hope this helps

Answer:

Leon

Explanation: all take up space and will have a mass to it.

Answer: An experimental group is a test sample or the group that receives an experimental procedure.

Explanation: This group is exposed to changes in the independent variable being tested. The values of the independent variable and the impact on the dependent variable are recorded. An experiment may include multiple experimental groups at one time.

Hope this helps! :)

Answer:

Answer:

Zymogen ActivationZymogens are activated by snipping the bonds between two or more amino acids, rather like cutting a balloon string so that it floats away. When the bonds are cut, the enzyme changes its conformation, its 3-D structure, so that the active site is free and able to become active.

Explanation:

Answer:

which affect does the industrial wastewater have on acidity of oceans ?

Answer:

which affect does the industrial wastewater have on acidity of oceans ?

Explanation:

Answer:

............

Explanation:

Explanation:

God loves you you are a good person

Answer:

Filtration

Explanation:

Filtration This technique is used to separate an insoluble solid from a liquid. It can be used to obtain a product that is free from unreacted chemicals, by-products or solvent.

Answer:

filtration

Explanation:

If a substance does not dissolve in a solvent, we say that it is insoluble . For example, sand does not dissolve in water – it is insoluble. Filtration is a method for separating an insoluble solid from a liquid.

please give me brainliest

Answer:

3

Explanation:

Taking into account the definition of molarity,  the molarity of the solution is  2 [tex]\frac{moles}{liter}[/tex].

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

[tex]Molarity=\frac{number of moles}{volume}[/tex]

Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].

In this case, 26.8 g of ammonium chloride is dissolved in water to make a 0.25 L solution. So you know:

Replacing in the definition of molarity:

[tex]Molarity=\frac{0.50 moles}{0.25 L}[/tex]

Solving:

Molarity= 2 [tex]\frac{moles}{liter}[/tex]

Finally, the molarity of the solution is  2 [tex]\frac{moles}{liter}[/tex].

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Answer:

Molar mass = 135.2 g/mol

Explanation:

Given data;

Mass of gas = 6.03 g

Volume of gas = 1.00L

Temperature = standard = 273 K

Pressure = Standard = 1 atm

Molar mass of gas = ?

Solution:

First of all we will calculate the number of moles of gas.

Formula

PV = nRT

1 atm ×  1.00L = n × 0.0821 atm.L/k.mol × 273 K

1.00 atm.L = n × 22.414  atm.L/mol

n = 1.00 atm.L/22.41  atm.L/mol

n = 0.0446 mol

Molar mass:

Molar mass = mass/number of moles

Molar mass = 6.03 g/0.0446 mol

Molar mass = 135.2 g/mol

Molar mass P2O5 = 31 x 2 + 16 x 5 => 142 g/mol

142 g ---------------- 6.02 x 10²³ molecules

0.930g g ------------ ( molecules )

molecules = 0.920 x ( 6.02 x 10²³ ) / 142

molecules = 5.53 x 10²³ / 142

= 3.89 x 10²¹ molecules

1 molecule P2O5 -------------------------- 7 atoms

3.89 x 10²¹ molecules -------------------- ( atoms )

atoms = ( 3.89 x 10²¹) x 7 / 1

atoms = 2.72 x 10²² atoms of P2O5

2.72 x 10²² atoms of P₂O₅ are there in 0.930 g of  P₂O₅.

Molar mass P₂O₅ = 31 x 2 + 16 x 5 => 142 g/mol

142 g atoms are present in 6.02 x 10²³ molecules

Therefore, total number of molecules in 0.930g of atoms is calculated as-

molecules = 0.930 x ( 6.02 x 10²³ ) / 142

molecules = 5.53 x 10²³ / 142

= 3.89 x 10²¹ molecules

1 molecule of P₂O₅ contains 7 atoms

Therefore, the number of atoms in 3.89 x 10²¹ molecules is calculated as

atoms = ( 3.89 x 10²¹) x 7 / 1

atoms = 2.72 x 10²² atoms of  P₂O₅

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Answer:

i belive its molecule

Explanation:

Explanation:

when they bond with each other the resultant chemical structure is molecule. the familiar water molecule is h2o

Answer:

ph2h2o

Explanation:

not quite sure explain

A. Atoms that are in only one of the reactants and only one of the

products should be done last.

C. Balancing chemical equations involves trial and error.

A balanced chemical equation is an equation for a chemical reaction in which the number of atoms for each element in the chemical reaction is the same for both the reactants and the products. In other words, the mass and the charge are balanced on both sides i.e. reactants and products of the chemical reaction. If two atoms are present on the side of reactant then the two number of atoms are present on the side of product, then this equation is called balanced chemical equation.

So we can conclude that option A and C are the statements that are true about balancing chemical equations.

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Answer:

b and c

Explanation:

Answer:

The study of meteorites has helped us understand the beginnings of our solar system, how planets and asteroids formed and how impacts of large meteorites have altered Earth's history and life on our planet.

Explanation:

Answer:

The key difference between atomic mass and average atomic mass is that the atomic mass is the mass of an atom, whereas the average atomic mass is the mass of an atom of a particular chemical element calculated by considering isotopes of that element.

Explanation:

Answer:

Groups

Explanation:

A "family" on the periodic table is also called a "group".

A "group" or a "family" of elements are elements of the same type on the periodic table, for example, all of the transition metals on the periodic table are a "group" or a "family".

I am not the best at this, but im pretty sure its below cloud

Answer:

it is not cloud it is soil

Explanation:

Answer:

I need help on this Laugh out loud

Explanation: