An earthquake in the area of present-day San Francisco is to be dated by measuring the¹⁴C activity (t₁/₂ = 5730 yr) of parts of a tree uprooted during the event. The tree parts have an activity of 12.9 d/min?g C, and a living tree has an activity of 15.3 d/min?g C. How long ago did the earthquake occur?

As the concentration of a solute in a non-electrolyte solution increases, the freezing point of the solution decreases and the boiling point of the solution increases.

This phenomenon is known as colligative properties, which are properties of a solution that depend on the concentration of solute particles rather than the identity of the solute itself.

When a solute is added to a solvent, it disrupts the regular arrangement of solvent molecules, making it more difficult for the solvent to freeze or boil. As a result, the freezing point of the solution is lowered, meaning the solution requires a lower temperature to freeze compared to the pure solvent.

On the other hand, the presence of solute particles also elevates the boiling point of the solution. The increased concentration of solute particles raises the boiling point, requiring a higher temperature for the solution to boil compared to the pure solvent.

These changes in freezing and boiling points are directly proportional to the concentration of the solute. As the concentration increases, the effect on the freezing and boiling points becomes more pronounced.

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Answer:

Explanation: It is B. all above

Barrier that must be overcome before products are formed in a spontaneous reaction is Activation energy barrier.

A spontaneous response is a response that favors the formation of products on the conditions underneath which the response is occurring. A roaring bonfire is an instance of a spontaneous response, in view that it is exothermic (there is a decrease inside the power of the system as energy is released to the environment as warmth).

Maximum spontaneous chemical reactions are exothermic - they release warmness and heat up their surroundings: for instance: burning wooden, fireworks, and alkali metals introduced to water. When a radioactive atom splits up, it releases strength: that is a spontaneous, exothermic nuclear reaction.

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Answer:

Option C.

Ilegal dumping of waste

Explanation:

This is because non point source of pollution refers to source of pollution that are many and not directly one which is illegal or does not meet the legal term. This type of pollution does not have a point source, it has many sources and this type of pollution is cause by rainfall or precipitation. Where when the rain fall, it wash away the waste through to water bodies, causing pollution and endangering water bodies.

Answer:

a.

84,791 » 8479

b.

256.75 » 256.8

c.

431,801 » 4318

d.

0.00078100 » 0.0007810

Explanation:

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A. The percentage of sulphur in tetraoxosulphate (vi) acid, H₂SO₄ is 32.7%

B. The percentage of phosphorus in tetraoxophoshate (v) acid, H₃PO₄ is 31.6%

B. The percentage of oxygen in calcium trioxonitrate (v), Ca(NO₃)₂ is 58.5%

The percentage of sulphur in tetraoxosulphate (vi) acid H₂SO₄ can be obtained as follow:

Percentage of S = (mass of S / mass of H₂SO₄) × 100

Percentage of S = (32 / 98) × 100

Percentage of S = 32.7%

The percentage of phosphorus in tetraoxophoshate (v) acid, H₃PO₄ can be obtained as follow:

Percentage of P = (mass of S / mass of H₃PO₄) × 100

Percentage of P = (31 / 98) × 100

Percentage of P = 31.6%

The percentage of oxygen in calcium trioxonitrate (v), Ca(NO₃)₂ can be obtained as follow:

Percentage of O = (mass of S / mass of Ca(NO₃)₂) × 100

Percentage of O = (96 / 164) × 100

Percentage of O = 58.5%

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Answer:

3rd or 4th answer is correct

OPTION B is the correct answer

Answer: The defense mechanism in which self-justifying explanations replace the real, unconscious reasons for actions is Rationalization.

Rationalization is a type of defense mechanism where individuals create a logical explanation for their own behavior, even if the behavior is actually driven by emotions or unconscious thoughts.

This type of defense is used to protect the ego from the anxiety of a certain situation, usually one that is perceived to be too uncomfortable or overwhelming.

By rationalizing a behavior, the individual is able to tell themselves that they did the right thing, even if the choice was not made consciously or with the best intentions. Rationalization is a way to protect one’s ego by creating a logical justification for an action.

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Explanation:

pure substance:-Elements and compounds

Answer:

The addition of hydronium ion increases the solubility of the salt

Explanation:

When a weak acid, MA dissociates in an aqueous solution, the following products in equilibrium are obtained;

MA ----> M+ + A-

The anion which is a conjugate base will be removed from the solution with the addition of a hydronium ion from an acid: 2H3O+ + 2A- ----> 2HA + 2H20

This distorts the reaction equilibrium. According to Le Chatelier’s principle, more MA will dissolve until in order to restore the previous equilibrium of the reaction.

Therefore, an acidic pH increases the solubility of almost all sparingly soluble salts whose anion is the conjugate base of a weak acid.

Among the given options, there is only one chemical property, which is flammability. This property measures the capability of substance to burn or ignite when exposed to a flame.

It means that in chemical properties you should put the flammability of ethyl alcohol.

In physical properties you should put the rest of the options.

The primary problem described by this ABG information is metabolic acidosis.This is due to the low HCO3 levels and the resulting low pH.

Metabolic acidosis is a condition in which there is an abnormal accumulation of acid in the body. This occurs when the body produces too much acid or does not eliminate it quickly enough. It can also occur when the kidneys are not able to adequately eliminate acid from the body. Symptoms of metabolic acidosis include fatigue, confusion, nausea, vomiting, and rapid breathing. In severe cases, it can lead to coma and even death. Treatment of metabolic acidosis involves correcting the underlying cause and treating the symptoms. Dietary changes, medications, and lifestyle changes can all help to reduce the accumulation of acid in the body. It is important to speak to a doctor if you think you may be suffering from metabolic acidosis.

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The volume of Dimethyl sulfoxide the student should pour out is, 77.27ml

Since the 1960s, dimethyl sulfoxide (DMSO) has been used in humans for medical treatment and as a pharmacological agent. DMSO is now primarily used in the cryopreservation of stem cells, the treatment of interstitial cystitis, and as a penetrating vehicle for various drugs.

Dimethyl sulfoxide has a density of 1.10 g/103L, or 1.10 g/mL.

Now we develop the following argument:

If a volume of 1 mL is contained in 1.10 g of dimethyl sulfoxide

The volume of 85 g of dimethyl sulfoxide is then X mL.

Dimethyl sulfoxide: X = (85X1) / 1.10= 77.27ml

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Answer:

In everyday life, changing the speed of a moving object will change its velocity. The other values, such as acceleration, momentum, and mass, will not be affected.

Answer:

Lipid tests

Sudan III is a red fat-soluble dye that is utilized in the identification of the presence of lipids, triglycerides and lipoproteins. The Reaction: Sudan III reacts with the lipids or triglycerides to stain red in colour.

Answer:

I think soo fats and oils

Answer:

1.24×10^6/6.2×10^-3

200

acc to scientific notation: 0.2×10^3 is the answer

Explanation:

pls mark me as brainlest

Answer:

The physical properties of minerals are determined by the atomic structure and crystal chemistry of the minerals. The most common physical properties are crystal form, color, hardness, cleavage, and specific gravity. One of the best ways to identify a mineral is by examining its crystal form (external shape).

Answer:

0.7 g/cm³

Explanation:

hey there,

< The formula for density is \(p = \frac{m}{v}\)  where m = mass, v = volume, and p = density. An easy way to remember the formula is density equals love. I found this easy to remember because p = ♡ and when you think about it, if you split the heart in half through the middle like a fraction, it will make \(\frac{m}{v}\) (if you don't understand what I'm saying, try writing it out and you will be able to see what I'm talking about!)

We already know that the block is 253 g so the mass is 253 g.

To find the volume, always multiply the 3 values width, length, and height whenever you are trying to find the volume of a block.

15.24 cm x 6.64 cm x 3.56 cm = 360.25 cm³

Now plug it into the formula.\(p = \frac{m}{v}=\frac{253}{360.25} = 0.7 g/cm\)³ >

Hope this helped! Feel free to ask anything else.

Density of a substance is its mass divided by volume. Volume of the cube is calculated to 360.24 cm³ and thus the density of the cube is 0.7023 g/cm³.

Density of a substance is the measure of its mass per volume. Thus mathematically it is the ratio of mass to the volume of th substance. Density of a substance depends on the bond type, mass, volume, temperature and pressure.

The ratio of density of a substance to the density of water is called specific gravity. If the specific gravity is greater than one the body will sink in water and if it is less than one it will float on water.

The mass of the block is given 253 g and the volume can be calculated from the product of length,breadth and height.

Volume = 15.24 cm × 6.64  cm × 3.56 cm

             = 360.24 cm³.

Density = mass/volume

             = 253 g/ 360.24 cm³

             = 0.7023 g/cm³

Hence, the density of the block is 0.7023 g/cm³.

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Answer: Iron is necessary for photosynthesis because it facilitates the transfer of electrons and protons within the chloroplasts, which is required for the production of ATP, which is energy.

Explanation: Biology class helped a lot with this answer.

The mass of diphosphorus pentoxide (P2O5) that contains a million (1.00*10^6) phosphorus atoms is 0.118 g.

To determine the mass of diphosphorus pentoxide (P2O5) that contains a million (1.00*10^6) phosphorus atoms, we can use the Avogadro's number which is equal to 6.022 × 1023.

Avogadro's number is useful in determining the number of particles in a given quantity of substance.

The molecular weight of P2O5 is 141.94 g/mol.

From the formula, we can see that there are 2 phosphorus atoms present in one molecule of P2O5.

Using Avogadro's number, the number of moles of phosphorus atoms is given by: 1.00 × 10^6 phosphorus atoms/ 6.022 × 10^23 phosphorus atoms per mole= 0.001660 moles of phosphorus atoms

In one molecule of P2O5, there are 2 phosphorus atoms.

Therefore, the number of moles of P2O5 is given by: (0.001660 moles of phosphorus atoms) / 2= 0.000830 mol of P2O5

Now, we can use the molecular weight of P2O5 to calculate the mass of P2O5 in grams:

Mass = number of moles × molecular weight

= 0.000830 mol × 141.94 g/mol

= 0.118 g

Therefore, the mass of diphosphorus pentoxide (P2O5) that contains a million (1.00*10^6) phosphorus atoms is 0.118 g.

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The statement is true. A molecule with polar bonds can either be polar or nonpolar depending on the arrangement of the polar bonds. Polar bonds are formed when two atoms with different electronegativities bond, resulting in an unequal sharing of electrons.

The more electronegative atom attracts the electrons towards itself, creating a partial negative charge while the other atom has a partial positive charge.

If the polar bonds in a molecule are arranged symmetrically, such that the partial charges on each atom cancel out, then the molecule is nonpolar.

However, if the polar bonds are arranged asymmetrically, such that the partial charges do not cancel out, then the molecule is polar.

For example, carbon dioxide (CO2) has two polar bonds between the carbon and oxygen atoms, but the molecule itself is nonpolar because the bonds are arranged symmetrically around the carbon atom, canceling out the partial charges.

On the other hand, water (H2O) also has polar bonds between the hydrogen and oxygen atoms, but the molecule is polar because the bonds are arranged asymmetrically, resulting in a partial negative charge on the oxygen atom and a partial positive charge on the hydrogen atoms.

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The uncertainty associated with the momentum of an electron is given by the Heisenberg uncertainty principle as approximately 5.5×10^(-21) kg·m/s, which is calculated by the uncertainty in position.

According to the Heisenberg uncertainty principle, the product of the uncertainty in position (Δx) and the uncertainty in momentum (Δp) of a particle is always greater than or equal to a constant value, Planck's constant (h), divided by 4π:

Δx * Δp ≥ h / (4π)

In this case, the uncertainty in position (Δx) of the electron is given as 3.3 × 10^(-11) m. To find the uncertainty in momentum (Δp), we rearrange the equation:

Δp ≥ h / (4π * Δx)

Plugging in the values, we have:

Δp ≥ (6.626 × 10^(-34) J*s) / (4π * 3.3 × 10^(-11) m)

Simplifying the expression:

Δp ≥ 5.03 × 10^(-24) kg*m/s

Therefore, the uncertainty associated with the momentum of the electron is 5.03 × 10^(-24) kg*m/s.

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Answer:

Technology  is the use of reliable knowledge for a practical purpose.  

Ecology  is the study of the natural world through observation and experimentation.  

Explanation:

Water and alcohol has no colour. Water has no smell but alcohol smell like musty. Salt more dissolve in water as compared to alcohol.

The water is colourless as well as odorless means it has no smell. Water can dissolve salt because the positive ion of water molecules attracts the negative chloride ions and the negative ion of water molecules attracts the positive sodium ions while on the other hand, the alcohol is colourless means it has no colour. The smell of alcohol is musty and sharp. Salt dissolves less in alcohol, because alcohol molecules have less ions as compared to water. Alcohol is non-polar like oil and salt is polar so it does not dissolve or very little in alcohol.

So we can conclude that Water and alcohol has no colour. Water has no smell but alcohol smell like musty. Salt more dissolve in water as compared to alcohol.

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Based on the data and Florence's observations, Florence has observed a chemical change. 2Na2S2O3 + I2 ----> Na2S4O6 + 2NaI.

A chemical reactions is the transformation of one substance into another, the emergence of new compounds with distinct properties, or any combination of these.It happens when two substances mix to create a new material.

A carrot being chopped up or ice dissolving into water are two examples of physical changes.Chemical transformations occur when two or more components are mixed to create a brand-new compound.You have such a new material after a chemical transformation.A chemical change might occur when burning paper or when baking a cake.

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Answer:

the particles start to spread out and cause it to get warmer

Explanation:

Answer:

When bit into without the onion's outermost skin, apples and onions share an extremely similar crunch. ... The flavors of the apple neutralize the onions pungency. So there you have it, if you plug your nose, close your eyes and bite into an onion...it is indistinguishable from an apple... until your nostrils open again.

Explanation:

Answer:

Apples, potatoes and onions will all taste the same if somehow you were to block your sense of smell (plug your nose).

Explanation:

Density of the unknown metal is 4.82 g/mL

Given,

mass of block is 83 g

When the block was placed in a graduated cylinder containing water, the volume of the block was 17.2 mL.

we have to find density with the help of these two terms,

As we know,

Density = Mass/volume

therefore,

Density = 83 / 17.2

= 4.82 g/mL

thus, density of unknown metal block is 4.82g/mL

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The frequency of the yellow light is equal to 5.13×10⁻¹⁴s⁻¹

The energy contained by one photon is known as photon energy and the photon energy is directly proportional to the frequency and inversely proportional to the wavelength of light

Here the given data is

E = 3.4×10⁻¹⁹J

The formula of energy of light is given by

E = hν

Where E is the energy of the light

h = plank constant  = 6.626 x 10⁻³⁵ J

ν = frequency of light

The given energy of yellow light = E = 3.4×10⁻¹⁹J

From the formula E = hν

3.4×10⁻¹⁹J =  6.626 x 10⁻³⁵ J×ν

ν = 0.513×10¹⁵s⁻¹

ν = 5.13×10¹⁴s⁻¹

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