Would you expect to find older or newer fossils in rock layers closer to the surface? Why?

Answer:

On the periodic table? But if you are talking about atomic NUMBER-then thats the number of protons on the upper left side of the symbol , but if you are talking about the mass then on the bottom left.

Since you are in highschool it shall always be provided hence no need to memorize it, just know the first 20

The atomic symbol for elements can be found on the periodic table.

The elements in the periodic table are arranged according to their rising atomic number and recurrent chemical characteristics. They are arranged in a tabular format with rows representing periods and columns representing groups.

The sequence of the elements' ascending atomic numbers is left to right and top to bottom. Thus, The valence electron configuration of elements belonging to the same group will be the same, resulting in identical chemical characteristics.

In contrast, valence electrons in the same period will be arranged in ascending order. As a result, there are more energy sub-levels per energy level as the atom's energy level rises. The very first 94 elements of a periodic table are found naturally, whereas the last 95–118 elements have only been created artificially in labs or nuclear reactors.

The periodic table we currently use is a more advanced version of certain models proposed by scientists in the 19th and 20th centuries. Based on the discoveries of those scientists who came before him, like John Newlands and Antoine-Laurent de Lavoisier, Dimitri Mendeleev proposed the periodic table. The periodic table was created by Mendeleev, who is the only person to receive credit for it.

Therefore, the atomic symbol for the elements can be found on the periodic table

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The final volume of the system is 325 L.

The change in internal energy of a system is equal to the heat added or removed from the system plus the work done on or by the system. In this case, the change in internal energy is -325 J, and the system loses 155 J of energy as heat.

To find the work done by the system, we need to use the equation: work = -pressure * change in volume.

Given that the initial volume is 15.0 L and the initial pressure is 1.00 atm, we can calculate the work done as follows:

work = -1.00 atm * change in volume

Now, let's solve for the change in volume:

work = -1.00 atm * change in volume
-325 J = -1.00 atm * change in volume

To find the final volume, we rearrange the equation:

change in volume = -325 J / -1.00 atm

The units of atm and J will cancel out, leaving us with the final volume in liters:

change in volume = 325 L atm / 1 atm
change in volume = 325 L

Therefore, the final volume of the system is 325 L.

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Answer:

D. The end of a slinky is moved vertically up and down to simulate a wave.

Explanation:

A Slinky is a compact helical coiled toy that can perform many number of tricks such as stretching it-self and come back in its original shape.

A slinky here is used as a model by a scientist to stimulate a wave or to understand the concept of the wave. To study the nature of waves, slinky is used to create waves by moving vertically up and down that leads to the vibration or disturbance in a medium.

Hence, the correct answer is "D. The end of a slinky is moved vertically up and down to simulate a wave."

Answer:

The answer would be option D.

Explanation:

I took the test and D was correct.

Hope this helps. ^^

The weaker acid in pair I is HBr because it has a higher atomic radius than HI. \(H_2SeO_3\) is the weaker acid in pair II because it has a higher atomic radius than \(H_3AsO_3.\) \(HNO_2\) is the weaker acid in pair III because it has a higher atomic radius than \(HNO_3\).

A. I. HBr II.\(H_3AsO_3\) III. \(HNO_2\)
B. I. \(HNO_2\) II. \(H_3AsO_3\) III. HBr
C. I. HI II. \(H_3AsO_3\) III. \(HNO_3\)
D. I. HBr II. \(H_2SeO_3\) III. \(HNO_2\)
E. I. HI II. \(H_2SeO_3\) III. \(HNO_2\)

In each of the given pairs, the weaker acid is the one with the larger atomic radius, as the larger atom has a weaker hold on its electrons and thus a weaker ability to donate a proton. In pair I, HBr has a larger atomic radius than HI, making it the weaker acid. In pair II, \(H_2SeO_3\) has a larger atomic radius than \(H_3AsO_3\), making it the weaker acid. In pair III, \(HNO_2\) has a larger atomic radius than \(HNO_3\), making it the weaker acid.

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Answer:

Living things can have a minimum of one cell

Explanation:

Living things can have a minimum of one cell; these are called unicellular organisms. Some examples of unicellular organisms: bacteria, algae (plants), some fungi, and protozoa

hope this helps!

In an ecosystem ,cell is the minimum amount of material that must be present in a living organism.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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Answer: C. A child shivering in the cold

Explanation:

Did the test. :)

Answer:

158.4 g

Explanation:

Find mass of CO2

= Number of moles x molar mass

= 3.6 mol x (12 + 16 + 16)

= 3.6 mol x 44

= 158.4 g

Volcanic eruptions are something that is not directly affected by either the sun or the moon.

Volcanic eruptions are geological events that occur due to the release of magma, gases, and other materials from beneath the Earth's surface. They are driven by internal forces within the Earth, such as plate tectonics and the movement of molten rock.

While the sun and the moon have significant influences on Earth's weather and climate, they do not directly cause volcanic eruptions. Volcanic activity is primarily associated with the movement of tectonic plates and the presence of magma chambers beneath the Earth's crust. The sun and the moon do not have a direct impact on these geological processes.

On the other hand, the sun and the moon do have important effects on the other options listed. The sun's energy drives wind patterns by heating the Earth's surface unevenly, creating temperature and pressure gradients that cause air to move.

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Answer:

c) 3570000

Explanation:

The standard form is a way to simplify too long or too short numbers. Standard form uses powers of ten to contract numbers.

x × 10^n

Where;

x = decimal number between 1.0 - 10.0

n = power of 10

According to this question, a number already in standard form is given as 3.57 x 10^6.

To convert to its long form, we count forward the power of ten beginning from where the decimal is. In this case, we're counting 6 times Note that once the decimal is after 7, we start placing zero (0) instead. Based on this, we have;

3.57 x 10^6

1st count = 35.7

2nd count = 357

3rd count = 3570

4th count = 35700

5th count = 357000

6th count = 3570000

Hence, the long form of the number 3.57 x 10^6 is 3570000.

The plan of care for a client who takes lithium should include periodic laboratory monitoring of renal and thyroid function and the correct option is option 3.

Two major long-term risks of lithium therapy are hypothyroidism and impairment of the kidney's ability to concentrate urine

Therefore, a person receiving lithium therapy must have periodic follow-ups to assess thyroid and renal function.

Weight gain and fine tremors are common side effects associated with this medication, but the patient should continue taking the medication.

Thus the ideal selection is option 3.

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Answer: It will usually form the anion F- since it is extremely electronegative and a strong oxidizing agent. Fluorine is a Lewis acid in weak acid, which means that it accepts electrons when reacting. Fluorine has many isotopes, but the only stable one found in nature is F-19.

Explanation:

The most common ionic form of fluorine is the fluoride ion (F-). Fluorine, as an element, is highly electronegative, meaning it has a strong tendency to attract electrons towards itself.

In the process of forming an ion, fluorine gains one electron to achieve a stable electron configuration, resulting in the fluoride ion.

For example, when fluorine reacts with sodium (Na), fluorine gains one electron from sodium to form the fluoride ion (F-) while sodium loses one electron to become the sodium cation (Na+). This forms an ionic bond between the two ions, resulting in the compound sodium fluoride (NaF).

The fluoride ion is also commonly found in compounds such as calcium fluoride  and aluminum fluoride . In these compounds, fluorine forms ionic bonds with other elements, resulting in the formation of stable compounds.

Overall, the fluoride ion is the most common ionic form of fluorine due to its high electronegativity and its ability to form stable compounds with other elements.

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Answer:

reaction to cold pack: change in temperature

Evidence of a chemical reaction etc is change in composition

Explanation: composition is atoms changeing and etc, which is a chemical reacton i think. Change in temperture is alsoa  chemical reaction but cold packs

Answer:

Cold pack: absorbs heat (endothermic reaction)

Hot pack: releases heat ( exothermic reaction)

Explanation:

when a cold pack/hot pack is shaken, water mixes with the chemicals in the outer layer and reacts to release or absorb heat.

Answer:

mass=36.8 g

Explanation:

density = mass/ volume

mass= density × volume

mass= 1.84× 20.0

mass=36.8 g

The mass of 20.0 mL solution if its density is 1.84 g/mL is 36.8 g.

The density of the solution may be defined as the ratio of the mass of the solution and the volume of the solution which can be represented as Density = mass of solution/volume of solution.

The density of the solution may be depicted with the help of the symbol ρ, commonly known as a row.

The mass of the given solution is calculated by the formula:

Density = mass/ volume

But here we have to calculate mass, so mass = density × volume.

Mass =  1.84× 20.0

Mass = 36.8 g.

Therefore, the mass of 20.0 mL solution if its density is 1.84 g/mL is 36.8 g.

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Answer:

C₂H6

Explanation:

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). Option A

A hydrocarbon is a compound that consists of only carbon and hydrogen atoms. It is important to identify the formula that represents a hydrocarbon among the given options:

A) C₂H6: This formula represents ethane, which is a hydrocarbon. Ethane consists of two carbon atoms bonded together with single bonds and six hydrogen atoms.

B) C₂H5OH: This formula represents ethanol, which is not a hydrocarbon. Ethanol contains a hydroxyl group (-OH), indicating the presence of oxygen in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

C) C₂H5Cl: This formula represents ethyl chloride, which is not a hydrocarbon. Ethyl chloride contains a chlorine atom (Cl) in addition to carbon and hydrogen atoms. It is a haloalkane, not a hydrocarbon.

D) C₂H6O: This formula represents ethanol, which, as mentioned before, is not a hydrocarbon. Ethanol contains an oxygen atom (O) in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). It consists only of carbon and hydrogen atoms, making it a suitable representation of a hydrocarbon.

In summary, the formula C₂H6 (option A) represents a hydrocarbon, while the other options contain additional elements (oxygen or chlorine) that make them non-hydrocarbon compounds. Option A

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Answer:

The four characrteristics of warm blooded animals are÷

Explanation:

i=They can keep its body temperature the same no matter what the outside temperature .

ii=They can maintain a constant body temperature.

iii=They obtain energy from food consumption.

iv=They maintain their body temperature higher than environment.

Answer:

i) Their body temperature remain constant in any climate.

ii) They obtain energy from food consumption

I only know this much:)

The reaction system CO(g) + 2 H2(g) = CH3OH(g) is at equilibrium, meaning that the rate of the forward reaction is equal to the rate of the reverse reaction. If H2 is added to the container, the forward reaction becomes favoured and shifts to the right. This increases the amount of products (CH3OH) formed, and decreases the amount of reactants (CO and H2). As a result, the partial pressure of CO remains the same, while the partial pressure of CH3OH decreases.

This is due to Le Chatelier's Principle, which states that when a system at equilibrium is subjected to an external stress, the system will adjust to minimize the stress. In this case, the stress is the addition of H2, which is favouring the formation of products and disrupting the equilibrium. The system responds by decreasing the amount of products formed and shifting the reaction back to equilibrium.

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Answer:

8 .....................

Consequently, 689.2 g of CaCl2 would be recovered if 0.52 L of a 5.3 M solution of CaCl2 were evaporated.

Add 58 g of calcium chloride to 1 L of water to make calcium chloride stock solution. Use an osmometer to measure the osmolarity; if it is below 1000 mmol/kg, add more CaCl2; if it is above 1000, add water. (A 1000 mmol/kg sample has an osmolarity of 0.3831 m.

We must apply the following formula to get the mass of CaCl2 recovered by evaporating a solution:

mass of solute = concentration of solution x volume of solution

To make the computation simpler, we must first change the solution's volume from litres (L) to millilitres (mL):

0.52 L x 1000 mL/L = 520 mL

The values can then be entered into the formula as follows:

mass of CaCl2 = 5.3 mol/L x 520 mL x 1 L/1000 mL x 1 mol CaCl2/2 mol ions

mass of CaCl2 = 5.3 x 520 x 1/1000 x 1/2

mass of CaCl2 = 689.2 g

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Since x represents a change in partial pressures, we can discard the negative solution. Therefore, at equilibrium:X = 0.612 atm

The equation for the reaction is H2O(g) + C(s) -> CO(g) + H2(g). At equilibrium, the partial pressures of H2O, CO, and H2 can be expressed as follows:
PH2O = 0.442 - x
PCO = 5.000 + x
PH2 = x
The carbon in excess means that its partial pressure remains constant. The equilibrium constant (Kp) for this reaction can be expressed as follows:
Kp =\frac{ (PCO)(PH2)}{(PH2O)}

Substituting the given values, we get:
Kp = \frac{(5.000 + x)(x)}{(0.442 - x)}

At equilibrium, Kp is constant. Therefore, we can use this expression to solve for x:
Kp =\frac{ (PCO)(PH2)}{(PH2O)} =\frac{ (5.000 + x)(x)}{(0.442 - x)}
Simplifying this equation, we get:
x^2 + 5.401x - 2.179 = 0
Solving for x using the quadratic formula, we get:
x = \frac{(-5.401  \± \sqrt{(5.401^2 + 4(2.179)}))} {2}
x = -6.013 or 0.612
Since x represents a change in partial pressures, we can discard the negative solution. Therefore, at equilibrium:
PH2O = 0.442 - 0.612 = -0.170 atm (not physically possible)
PCO = 5.000 + 0.612 = 5.612 atm
PH2 = 0.612 atm
Note that the negative value for PH2O is not physically possible, which indicates that the reaction did not reach equilibrium under the given conditions.

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Answer:

a

Explanation:

The correct answer is Option D The concentration of the solution was actually lower than 0.150 M.

The absorbance of a solution per unit route length and concentration is known as absorptivity or molar absorptivity. The Beer Lambert Law is where it comes from. According to Beer Lambert Law, the absorbance of electromagnetic waves by a solution is directly proportional to the solution's concentration and the length of the light beam's path.

The amount of light absorbed by a solution is measured by its absorbance (A), often referred to as optical density (OD). The amount of light that may flow through a solution is called its transmittance. In spectrophotometry, absorbance and percent transmittance are frequently employed and can be stated as follows:

A is the amount of light absorbed by the sample at a specific wavelength, is the molar absorptivity, l is the length of time the light spends in the solution, and c is the concentration of the absorbing species per unit volume. These variables are all included in the standard equation for absorbance, which is A = x l x c.

A = ɛ x l x c

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The correct classification for both calcium (Ca) and iron (Fe) is:

D) Ca is an alkaline earth element and a metal, and Fe is a transition element and a metal.

Calcium (Ca) belongs to the alkaline earth metals group, which is located in Group 2 of the periodic table. Alkaline earth metals are characterized by their reactivity, high melting points, and tendency to form 2+ cations. Therefore, Ca is classified as an alkaline earth element and a metal.

Iron (Fe) is a transition element, also known as a transition metal. Transition metals are located in the d-block of the periodic table and are characterized by their ability to form multiple oxidation states and exhibit variable valencies. Fe is classified as a transition element and a metal due to its properties and location in the periodic table.

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Using water displacement can be a viable method to determine the density of cadmium nitrate.

While it is not a conventional method, water displacement can be used to determine the density of cadmium nitrate. By measuring the volume of a known mass of cadmium nitrate based on the amount of water it displaces, the density can be calculated.

However, it is important to consider the solubility of cadmium nitrate in water and any potential chemical reactions or interactions that may occur. This method can provide an estimation of the density, but it is essential to exercise caution and consider the limitations and potential factors that may affect the accuracy of the measurement.

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Answer:

B. Coffee

Explanation:

Coffee is a common homogenous mixture.

Answer:

6NO2+3H2O-------->3HNO2+3HNO3

Aluminum alloy is used in the internal structure of satellites due to its conductivity, lightweight nature, and ability to withstand harsh space environments.

Aluminum alloy is chosen as a material for the internal structure of satellites for several reasons. Firstly, it possesses good electrical conductivity, allowing for efficient transmission of electrical signals and power throughout the satellite. This is crucial for the operation of various electronic components onboard.

Secondly, aluminum alloy is lightweight compared to many other metals, making it ideal for space applications where every kilogram of weight matters. By using aluminum alloy, the overall weight of the satellite can be minimized, enabling easier launch and reducing fuel consumption.

Lastly, the aluminum alloy exhibits excellent strength and durability, enabling it to withstand the harsh conditions of space, including extreme temperatures, vacuum, and radiation. These properties ensure that the satellite structure remains intact and reliable throughout its operational lifespan.

Considering its electrical conductivity, lightweight nature, and ability to withstand space environments, aluminum alloy proves to be a practical and reliable choice for the internal structure of satellites.

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Taking into account the definition of density, the density of the pen is 1.8523 g/mL.

Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space and it is a quantity that allows to measure the amount of mass in a certain volume of a substance.

The expression for the calculation of density is:

density= mass÷ volume

From this expression it can be deduced that density is inversely proportional to volume.

In this case, you know that:

Replacing in the definition of density:

density= mass of the pen÷ volume of the pen

density= 24.08 g÷ 13 mL

Solving:

density= 1.8523 g/mL

In summary, the density of the pen is 1.8523 g/mL.

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Answer:

Explanation:

have a good day

(a) The decay rate of radioisotopes decreases with time according to the exponential decay formula:

decay rate = initial decay rate × (1/2)^(time/half-life)

given Assign a value.

35.0 decay/sec = initial decay rate × (1/2)^(7000 years / 5730 years)

Solving for the initial decay rate, the wood sample when the tree was felled had about 67.8 decay/sec.

(b) The total nuclear binding energy can be calculated using the formula:

Binding Energy = Nuclear Mass - (Proton Mass + Neutron Mass)

We need the nuclear mass. Find the proton mass and neutron mass. The mass of the atomic nucleus can be obtained from the atomic mass listed in the periodic table. For 14C, it is 14.003241 amu. The masses of protons and neutrons can be found by looking them up in the table of atomic masses. A proton has a mass of 1.007276 amu and a neutron has a mass of 1.008665 amu.

Using these values, the total binding energy of 14C can be calculated. Converting to meV, we find that the total binding energy of 14C is about -7.8 meV.

(c) Energy is released when two 7Li nuclei collide to form a 14C nucleus. This can be calculated using the formula:

q value = (final nuclear mass - initial nuclear mass) × c^2

where c is the speed of light.

Substituting the values ​​given in the question, we get: We can see that the emitted energy is about 17.3 mev.

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The equivalency solution has a pH of 2.624.

Nitrous acid is frequently created by adding a mineral acid to aqueous sodium nitrite solutions. Typically, acidification is carried out at ice-cold temperatures, and HNO2 is consumed on-site. Nitrous acid in its free form is unstable and breaks down quickly.

In a neutralization process, weak nitrous acid (HNO2) reacts with strong basic KOH.

HNO2 + KOH → KNO2 + H2O

Then, we determine how many moles of KOH were used:

volume KOH x concentration equals moles KOH. KOH

moles KOH = 0.190 L x 0.377 mol/L

moles KOH = 0.07153 mol

Next, we calculate the initial concentration of HNO2:

concentration HNO2 = moles HNO2 / volume HNO2

concentration HNO2 = 0.07153 mol / 0.190 L

concentration HNO2 = 0.3765 M

[HNO2] = 0.5 x 0.3765 M

[HNO2] = 0.1883 M

The following equation can be used to model how nitrous acid dissociates in water:

HNO2 + H2O ⇌ H3O+ + NO2-

The following equation relates the pKa to the acid dissociation constant, Ka, for this reaction:

pKa = -log Ka

So we can find the Ka value from the given pKa:

pKa = -log Ka

3.35 = -log Ka

Ka = 10⁻³

Ka = 4.47 x 10⁻⁴

The relationship shown below is true for the concentrations of the species involved at equilibrium:

Ka = [H3O+][NO2-] / [HNO2]

Ka = [H3O+][NO2-] / [HNO2]

Ka = [H3O+] [HNO2]

Solving for [H3O+], we get:

[H3O+] = Ka / [HNO2]

[H3O+] = (4.47 x 10⁻⁴) / (0.1883 M)

[H3O+] = 0.002374 M

Finally, we can calculate the pH of the solution:

pH = -log[H3O+]

pH = -log(0.002374)

pH = 2.624

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