After 0.050 mole of hydrofluoric acid is dissolved in 200 mL of aqueous solution, it is found that 7.90% of the acid is dissociated at equilibrium. Calculate the equilibrium concentrations of H3O , undissociated hydrofluoric acid (HF), and conjugate weak base of hydrofluoric acid.

Answer:

Any thing that takes up space and has mass

Explanation:

Answer:

1.mass 2.space

Your welcome

Answer: Approximately 22.04% of the original.

Explanation: Radioisotopes, like iodine-131, have unstable nuclei. To become stable, they eject some particle (alpha or beta) or energy (gama).

Half-life is a time for half of the substance to decay. Activity is rate of decay, i.e., the number of decays per unit time.

Half-life and Activity are related by the following:

[tex]A=A_{0}.\frac{1}{2^{n}}[/tex]

where

A is activity

[tex]A_{0}[/tex] is initial activity

n is number of half-lives passed in t

For iodine-131, half-live is 8.02, so in 17.5 it has passed:

[tex]n=\frac{17.5}{8.02}[/tex]

n = 2.182

Final activity will be:

[tex]A=\frac{A_{0}}{2^{2.182}}[/tex]

[tex]A = 0.2204A_{0}[/tex]

Which means after 17.5 days, there were 22.04% of the original iodine-101.

Answer:

Fold, in geology, undulation or waves in the stratified rocks of Earth's crust. Stratified rocks were originally formed from sediments that were deposited in flat horizontal sheets, but in a number of places the strata are no longer horizontal but have been warped. FoldsEdit. When rocks experiencing compressive stress deform plastically, the rocks crumple into folds. Folds are just bends in the rock. You can easily make folds by placing your hands on opposite edges of a piece of cloth and pushing the cloth together. monocline:a bend in rock strata that are otherwise uniformly dipping or horizontal. Bedrock along the northeast coast of Hudson Bay, Canada, has the oldest rock on Earth. Canadian bedrock more than 4 billion years old may be the oldest known section of the Earth's early crust. anticline:a ridge-shaped fold of stratified rock in which the strata slope downward from the crest. syncline:a trough or fold of stratified rock in which the strata slope upward from the axis.

Explanation:

Answer:

1. Fold, in geology, undulation or waves in the stratified rocks of Earth's crust. Stratified rocks were originally formed from sediments that were deposited in flat horizontal sheets, but in a number of places the strata are no longer horizontal but have been warped.

2. FoldsEdit. When rocks experiencing compressive stress deform plastically, the rocks crumple into folds. Folds are just bends in the rock. You can easily make folds by placing your hands on opposite edges of a piece of cloth and pushing the cloth together.

3.a bend in rock strata that are otherwise uniformly dipping or horizontal.

4. a ridge-shaped fold of stratified rock in which the strata slope downward from the crest.

5.In anticlines, as seen on the ground, the oldest rocks are in the center of the fold. In synclines, the youngest rocks are in the center of the fold. This intensely folded limestone from Highland County shows how anticlines and synclines typically occur together. These sharp folds are called "chevron" folds.

Answer:

False

Explanation:

Cells are constantly dying and being reproduced.

Answer:

False.

Explanation:

Your cells are in a constant state of dieing and being replaced by new cells. As a result, very few of the cells in your body now are the exact same cells that you had 20 years ago. Your cells are constantly dying, but they're being replaced with new, fresh cells. ... The average age of a cell is 7 years… but that doesn't mean that every cell is replaced in 7 years. Some cells, in fact, never get replaced at all, remaining with us from birth until death.

[tex]\text {Hi There! Let's Solve this Problem!}[/tex]

[tex]\text {Since we are trying to find how many milligrams (mg) are in 13 grams}[/tex] [tex]\text {we Multiply 1000.}[/tex]

[tex]\text {\underline {Multiply}}[/tex]

[tex]\text {1000*13=}[/tex]

[tex]\text {Your Answer Would Be:}[/tex]

[tex]\fbox {13000}[/tex]

[tex]\text {Best of Luck!}[/tex]

Answer:

Cleavage and Fracture

Explanation:

Cleavage and Fractures are both characteristics used to determine a type of mineral, along with hardness, luster, color, streak, specific gravity, and tenacity, all of which not included in the answers.

Answer:

Weight

Explanation:

WHen talking about weight you’re referring to the force exerted to lift if, but when you’re talking about mass it’s just how much it weighs but not how much it takes to lift it.

Answer:

1. The oxidation number of Li changes from 0 to +1

2. The oxidation number of Cu changes from +2 to 0.

3. The oxidation number of Cl remains the same in each compound.

Explanation:the equation for the reaction is given below:

Li(s) + CuCl2(s) —> LiCl(s) + Cu(s)

Next, we shall determine the oxidation number of each element in the reaction.

NOTE: 1. Oxidation number of chlorine (Cl) is always –1 in any compound because it is a ground 7 element.

Now, we shall determine the change in oxidation number of each element. This is illustrated below:

1. For Li:

Li = 0 (ground state)

LiCl = 0

Cl = –1

Li + (–1) = 0

Li – 1 = 0

Collect like terms:

Li = 0 + 1

Li = +1

The oxidation number of Li changes from 0 to +1

2. For Cu:

CuCl2 = 0

Cu + 2Cl = 0

Cl = –1

Cu + 2(–1) = 0

Cu – 2 = 0

Collect like terms

Cu = 0 + 2

Cu = +2

Cu = 0 (ground state)

The oxidation number of Cu changes from +2 to 0.

3. For Cl:

The oxidation number of Cl remains the same in each compound.

Summary:

1. The oxidation number of Li changes from 0 to +1

2. The oxidation number of Cu changes from +2 to 0.

3. The oxidation number of Cl remains the same in each compound

Answer:

V1 = 10 L

V2 = x L

T1 = 350 K

T2 = 680 K

And you are looking for the second Volume

 the image shows the work and the answer is going to be 19.4 L or just 19 L

Hence, 19.4 L is the new volume of gas when the initial volume of 10L at a temperature of 350K and is then heated to 680K.

The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases.

An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).

Given data:

[tex]V_1[/tex] = 10 L

[tex]V_2[/tex] =?

[tex]T_1[/tex] = 350 K

[tex]T_2[/tex]= 680 K

Now using equation:

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

[tex]\frac{10 L}{350 K} = \frac{V_2}{680 K}\\[/tex]

[tex]V_2[/tex] = 19.4 L

Hence, 19.4 L is the new volume of gas when the initial volume of 10L at a temperature of 350K and is then heated to 680K.

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Answer:

C3H8O

Explanation:

These are the steps:

1. Write the given value for each element.

2. divide them by their Ar.

3. Divide the result by the smallest value in the ratio.

C H O 59.94% 13.44% 26.62% 59.94÷12 13.44÷1 26.62÷16

4.995 13.44 1.664

(4.995÷ 1.664) (13.44÷ 1.664) (1.664÷1.664)

3.00 8.07 1

3 : 8 : 1

So the compound is C3H8O.

Answer: a

Explanation: enzymes are a type of chemical in your body that helps break down food, thus it’s a chemical change in your body.

Food is broken down by the enzymes in the stomach is an example of chemical change happening inside the body. So the correct option is A.

The process of breakdown down food into its constituent nutrients is defined as the process of digestion. The process of digestion is of two types -

Thus, digestion begins in the mouth and both mechanical and chemical digestion takes place in the mouth. In the small intestine, the food is broken down into the smallest constituent nutrients and absorbed into the body.

Therefore the correct option is A.

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Answer: a

. dissolving it in water

Explanation:

When the unknown material is dissolved in water, it could react with the water particles and end up producing another material. For instance an alkali metal in water could form metal oxides.

Heating the material until it melts will not change it into another material because it will still be the same material only now it will be in liquid form. The same logic applies if it is burnt in a flame.

Answer:

liquid to solid

Explanation:

liquid atoms are closer together but can slide past one then it starts to lose energy and locks in which in that case turns intl a solid.

Hopefully that helped

The scenario described in the question suggests a change from a liquid state to a solid state, known as solidification or freezing. When a liquid is cooled, the energy of the molecules decreases and they begin to move more slowly.

As the temperature approaches the freezing point, the attractive forces between the molecules begin to overcome their thermal energy, causing the molecules to arrange themselves in a more organized and compact structure. Eventually, the molecules become locked in place, forming a solid.

The degree to which a liquid can be supercooled before solidifying depends on factors such as the specific properties of the liquid, the rate of cooling, and the presence of impurities.

In some cases, supercooling can occur where a liquid is cooled below its normal freezing point without solidifying. However, even in these cases, the liquid will eventually solidify if it is disturbed or seeded with a small crystal of the solid phase.

Therefore, Solidification is an important process in many industries, such as metalworking and manufacturing of plastics and ceramics. Understanding the factors that influence solidification can help improve the quality and properties of these materials.

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Explanation:

Water molecules form hydrogen bonding when the oxygen of one water molecule combines with the hydrogen of another molecule.

Hydrogen bonding is an electrostatic attraction between the hydrogen atom of one molecule and the electronegative atom of a neighboring molecule.

Answer:

Read only memory (ROM) is non-volatile primary storage. It keeps its contents when the computer is turned off. ROM can be read from but not written to. ROM can be read from but not written to, hence the term read only.

Explanation:

Answer:

38.4%

Explanation:

Step 1 Obtain the concentration of Ca^2+ and SO4^2-

[Ca^2+] = 0.05 L (0.0125 mol/L) (1/0.1 L) = 6.25 * 10^-3 M

[SO4^2-] = 0.05 L (0.0152mol/L) (1/0.1L) = 7.60 * 10^-3 M

Step 2 Obtain the concentration of [SO4^2-]  left

         Ca^2+(aq)             +       SO4^2-(aq)------> CaSO4(s)

initial  6.25 * 10^-3 M             7.60 * 10^-3 M

final        0                               1.35 * 10^-3 M

Step 3 Determine the amount of Ca^2+ left from the common ion problem

                      CaSO4(s) --------> Ca^2+(aq)             +       SO4^2-(aq)

initial                                             0                                 1.35 * 10^-3 M

equilibrium                                    x                                (1.35 * 10^-3  + x) M

But Ksp of CaSO4 = 9.1 * 10^-6

Ksp = [Ca^2+] [SO4^2-]

9.1 * 10^-6= [x] [1.35 * 10^-3  + x]

9.1 * 10^-6= 1.35 * 10^-3 x + x^2

Rearranging:

x^2 + 1.35 * 10^-3 x + 9.1 * 10^-6 = 0

solving the quadratic yields x = 2.4 * 10^-3

Step 4 Calculate the amount of Ca^2+ remaining;

% Ca^2+ remaining = 2.4 * 10^-3/ 6.25 * 10^-3 M * 100

% Ca^2+ remaining = 38.4%

Answer:

2502 cm/s

Explanation:

In conversions from one unit to another,we always use a conversion factor. A conversion factor is a number used to change one set of units to another, by multiplying or dividing.  The conversion factor in changing km/hr to cm/s is:

1 km/hr = 27.8 cm/s.

Hence 90 km/hr = 90 * 27.8 = 2502 cm/s

Answer: B

Explanation:

Answer:

157 64 Gd + 1 0 n -----> 158 64 Gd + γ

Explanation:

In a nuclear reaction, both mass and charge are conserved. If we look at the equation above, we will notice that this principle was followed.

Gama rays has no mass and charge because it is an electromagnetic wave. The relative atomic mass of the isotope of Gd formed in the reaction is 158 Gd. The atomic number remains the same.

A.THERMOMETERS SEISMIC WAVES

Answer:

The third electron to be removed has to be in;

n = 3

l = 2

ml = -2, -1, 0, 1, 2

Explanation:

There are four basic quantum numbers;

i) principal quantum number (n)

ii) Azimuthal, Obital or Subsidiary quantum number (l)

iii) Magnetic quantum number (ml)

iv) Spin quantum number (ms)

The electronic configuration of Fe3+ is:

1s2 2s2 2p6 3s2 3p6 3d5

The third electron to be removed has to be in;

n = 3

l = 2

ml = -2, -1, 0, 1, 2

The third electron removed in the formation of a Fe³⁺ has the quantum numbers:

Iron has an atomic number of 26, so it has the following electron configuration:

[tex]Fe: [Ar] 4s^{2} 3d^{6}[/tex]

To form cations, it first loses the electrons from the outermost shell (4s). The electron configuration of Fe²⁺ is:

[tex]Fe^{2+} : [Ar] 4s^{0} 3d^{6}[/tex]

Then, it will lose an electron from the highest energy level (3d) to form Fe³⁺.

[tex]Fe^{3+} : [Ar] 4s^{0} 3d^{5}[/tex]

The third electron lost from Fe to form Fe³⁺ was in 3d⁶.

The third electron removed in the formation of a Fe³⁺ has the quantum numbers:

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Answer:

1105.7kg of limestone must be added

Explanation:

A solution is neutralized when pH = 7.0. That is [H+] = 1x10⁻⁷M.

The initial [H+] is 10^-5.3 = 5.01x10⁻⁶M.

That means we need to neutralize:

5.01x10⁻⁶M - 1x10⁻⁷M = 4.91x10⁻⁶M

The moles of H+ in 4.5 billion liters = 4.5x10⁹L are:

4.91x10⁻⁶M * (4.5x10⁹L) = 22095 moles of H+

That reacts with limestone (CaCO3), as follows:

2H+ + CaCO3 → H2O + CO2 + Ca²⁺

Moles of limestone needed to neutralize the lake are:

22095 moles of H⁺ * (1 mole Limestone / 2 moles H⁺) = 11047.5 moles of limestone.

Molar mass of limestone is 100.09g/mol. Mass of limestone we need to add are:

11047.5 moles of limestone * (100.09g / mol) = 1.106x10⁶g of limestone. In kg:

1.106x10⁶g of limestone * (1kg / 1000g) =

1105.7kg of limestone must be added

Answer:

2. chloroplast

3. cell wall

4. vacuole

5. mitochondrion

6. nucleus

7. lysosome

8. cytoplasm

Explanation:

The inertia of a bowling ball is greater than​ the inertia of a golf ball.

In Newton's first law, it is stated that if the resultant force acts on an object of magnitude is zero, it can be formulated:  

[tex]\large{\boxed{\bold{\sum F=0}}[/tex]

then the object tends to defend itself from its state.  

or can be stated:  

An object at rest stays at rest and an object in motion stays in motion unless acted upon by an unbalanced force.  

So for objects in a state of movement, objects tend to move forever. Likewise, for objects in a state of rest, they tend to remain forever. The tendency of objects like this is called inertia  

The size of inertia is proportional to mass, the greater the mass of the object, the greater the inertia of the object.  

Objects that have more mass will have more ability to maintain their state

So a larger bowling ball mass will have greater inertia than a golf ball

Answer:

greater than

Explanation:

I did this assignment

Answer:

The true statement about Sir Isaac Newton is that he made a connection between the mass of objects and the distance between them. Hence option B is correct.

Mass is defined as a dimensionless number used to describe the mass of a particle or item. Gravity and inertia, which are the two main forces influencing how objects move in space, make mass crucial. A substance's mass, expressed in kilograms (kg), can be used to estimate its matter content.

Every item in the universe is attracted to one another by a force that is directly proportional to the product of the masses of the objects and inversely proportional to the distance between them, according to Newton's law of universal gravitation.

Thus, the true statement about Sir Isaac Newton is that he made a connection between the mass of objects and the distance between them. Hence option B is correct.

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Answer:

2

Explanation:

Panthenol (or provitamin B5) is an active ingredient used as a moisturizer, in particular, to treat sensitive and dry skin. It also goes into the hair care formulation to nourish dry hair. All the benefits of this precursor of vitamin B5.

It has moisturizing, anti-inflammatory, regenerating, and healing properties. Panthenol also strengthens the hydrolipidic film, improves the elasticity of the skin, and promotes cell renewal in the event of injuries: this is why it is also used in the event of injuries or sunburn.

Thus, from the image below, the structure of Panthenol is being shown and the number of possible stereoisomers is being outlined as well.

Answer:

Maybe D? B?

Explanation:

Sorry if I made u get it wrong