Changes in the environment that cause an organism to respond are called?

Answer:

mass=density x volume

Explanation:

Final answer:

Density can be calculated by dividing the mass of a substance by its volume. The formula is Density = mass / volume.

Explanation:

The density of a substance can be calculated by dividing its mass by its volume. For example, let's say we have a sample of a substance with a mass of 50 grams and a volume of 20 cubic centimeters. To find the density, we would divide the mass by the volume:

Density = mass / volume

So in this case, the density would be:

Density = 50g / 20 cm3 = 2.5 g/cm3

Thus, the density of the substance is 2.5 grams per cubic centimeter.

Answer:

gallium

Explanation:

Answer:

The answer is choice (4) 268 g.

Explanation:

To find this answer you have to go to the reference table, using Table G, and go to KNO3 at 70°C. Find out how many grams saturate potassium nitrate (134 g). Then you double it (268 g ) because it's asking for grams at 200 grams of water.

Answer with Explanation:

The environment where the sediments are deposited gives an information regarding the rock that eventually forms.

The minerals and textures of the rocks can tell what kind of environment they were formed as they were being deposited. The fossils embedded in the rocks (sedimentary rocks) or the outcrops can also tell what happened on earth during those times. The process of rock accumulation also tells whether there was a high level of flood, strong winds or sub-arctic environments occurring.

This then gives an evidence of the earliest life forms on Earth.

Final answer:

The depositional environment where sediments are collected has a direct impact on the type of sedimentary rock that forms, with factors such as available oxygen affecting characteristics like rock color. This information helps geologists reconstruct past Earth conditions and ecosystems.

Explanation:

The environment where sediments are deposited has significant implications for the sedimentary rock that will eventually form. For instance, beaches and deserts accumulate large deposits of sand, potentially forming sandstone, while the deep ocean floor might host sediments that turn into shale or limestone.

Depositional environments impart specific characteristics to the resulting rocks. Examples of this include the presence of oxygen influencing rock color during and after sediment burial. Understanding these environments allows geologists to reconstruct past Earth conditions and the history of life on our planet.

Sedimentary rocks from one environment might share similar types but can also be found across varying conditions, making pinpointing the depositional environment a challenging task. Yet, clues like sediment properties, rock color, and the presence of fossils provide invaluable insights into the ancient environments where these rocks formed.

Answer: The molar mass of the vapor comes out to be 43.83 g/mol. This problem is solved by using ideal gas equation. The ideal gas equation is shown below

[tex]\textrm{PV} =\textrm{nRT}[/tex]

Explanation:

Volume of gas = V = 247.3 mL  

V = 0.2473 L

Pressure of gas = P = 745 mmHg

1 atm = 760 mmHg

[tex]\textrm{P} = \displaystyle \frac{745}{760} \textrm{ atm} = 0.98026 \textrm{ atm}[/tex]

Temperature of gas = T = 100[tex]^{\circ}C[/tex] = 373 K

Given mass of gas = m = 0.347 g

Assuming molar mass of gas to be M g/mol

Assuming the gas to be an ideal gas, the ideal gas equation is shown below

[tex]\textrm{PV} =\textrm{nRT}[/tex]

Here, n is the number of moles of gas and R is the universal gas constant.

[tex]\textrm{PV} =\textrm{nRT} \\\textrm{PV} = \displaystyle \frac{m}{M}\textrm{RT} \\0.98026 \textrm{ atm}\times 0.2473 \textrm{ L} = \displaystyle \frac{0.347 \textrm{ g}}{M}\times 0.0821 \textrm{ L.atm.mol}^{-1}.K^{-1}\times 373 \textrm{ K} \\M = 43.83 \textrm{ g/mol}[/tex]

Hence, the molar mass of the vapor comes out to be 43.83 g/mol

Answer:

none of the options are correct

Explanation:

For cm3

1L = 1000cm3

40L = 40 x 1000 = 40000cm3

For m3

1L = 0.001m3

40L = 40 x 0.001 = 0.04m3

For mL

1L = 1000mL

40L = 40 x 1000 = 40000mL

From the calculations above, none of the options are correct

Answer:

There are 70 grams of KOH

Explanation:

First, we calculate the weight of 1 mol of KOH:

Weight 1 mol KOH: Weight K + Weight 0 + Weight H=  39g+ 1g+ 16g= 56 g/mol

1 mol-------56 g KOH

1,25 mol----x= (1,25 molx56 g KOH)/1 mol= 70 g KOH

1 mole of lead has the greatest mass because its molar mass of approximately 207.2 g/mol is higher than that of silver (107.87 g/mol), copper (63.55 g/mol), and tungsten (183.84 g/mol), and all samples contain Avogadro's number of atoms.

To determine which substance has the greatest mass, we need to compare the molar masses of silver, copper, lead, and tungsten. The molar mass is the mass in grams of one mole of a substance, and it is numerically equivalent to the atomic mass for elements. Let's examine the atomic masses of these elements:

Given that 1 mole of each substance contains the same number of atoms (6.022 × 10²23 atoms, Avogadro's number), the substance with the highest molar mass will have the greatest mass. In this case, lead has the highest molar mass at approximately 207.2 g/mol, and therefore 1 mole of lead will have the greatest mass compared to 1 mole of silver, copper, or tungsten.

Final answer:

Lead (Pb) has the greatest mass.

Explanation:

The substance with the greatest mass in this case would be lead (Pb).

To determine which substance has the greatest mass, we need to compare their molar masses. The molar mass of silver (Ag) is approximately 107.87 g/mol, copper (Cu) is approximately 63.55 g/mol, lead (Pb) is approximately 207.2 g/mol, and tungsten (W) is approximately 183.84 g/mol.

Since lead (Pb) has the highest molar mass of the four substances, it has the greatest mass.

Answer:

74.09 atm

Explanation:

Using the gas laws ( Charles and Boyle's law). We have the formula ,

P1/T1 = P2/T2

Where P1 = 30.3atm

T1 = -100 degree Celsius

to kelvin = -100+ 273 = 173K

T2 = 150 degree Celsius

To Kelvin = 150 = 150+273 = 423K

Imputing values

P1/T1 = P2/T2

30.3/173 = P2/ 423

Cross multiply

173×P2 = 30.3 ×423

173P2 = 12816.9

Divide both sides by 173

P2 = 12816.9/173

P2 = 74.09 atm

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Answer:

P2=74.086atm

Explanation:

Using the formula p1/t1=P2/t2

P1=30.3atm

P2=?

T1=-100°c to Kelvin=273-100=173k

T2=150°c to Kelvin=273+150=423k

30.3\173=x/423

Cross multiply

173x=423×30.3

173x=12816.9

Divide both sides by 173

X=74.086atm

Answer:

Molarity = 0.08 M

Explanation:

Given data:

Mass of sodium carbonate = 10.6 g

Volume of water = 1.25 L

Molarity of solution = ?

Solution:

First of all we will calculate the moles of solute.

Number of moles = mass/molar mass

Number of moles = 10.6 g/ 106 g/mol

Number of moles = 0.1 mol

Formula:

Molarity = moles of solute / volume of solution in L

Now we will put the values in formula.

Molarity = 0.1 mol / 1.25 L

Molarity = 0.08 M

Answer:

Mass of water = 21.6 g

Explanation:

Given data:

Mass of C₂H₆ = 15 g

Mass of O₂ = 45 g

Mass of water produced = ?

Solution:

Chemical equation:

2C₂H₆ + 7O₂     →       4CO₂ + 6H₂O

Number of moles of C₂H₆:

Number of moles = mass/ molar mass

Number of moles = 15 g/ 30 g/mol

Number of moles = 0.5 mol

Number of moles of O₂ :

Number of moles = mass/ molar mass

Number of moles = 45 g/ 32 g/mol

Number of moles = 1.4 mol

Now we will compare the moles of C₂H₆ and O₂ with H₂O.

                           C₂H₆           :                H₂O

                             2               :                  6

                           0.5              :          6/2×0.5 = 1.5

                            O₂              :                H₂O

                             7               :                  6

                           1.4               :           6/7×1.4 = 1.2

The number of moles of water produced by  oxygen are less so it will limiting reactant.

Mass of water produced:

Mass = number of moles × molar mass

Mass = 1.2 mol × 18 g/mol

Mass = 21.6 g

Answer:

To react with 0.5 moles of zinc 1 mole of hydrochloric acid is required

Explanation:

Given data:

Number of moles of HCl = ?

Number of moles of Zn = 0.50 mol

Chemical equation:

Zn + 2HCl  → H₂ + ZnCl₂

Now we will compare the moles of zinc and HCl.

                       Zn       :        HCl

                         1        :            2

                       0.50   :         2×0.5 = 1 mol

So, to react with 0.5 moles of zinc 1 mole of hydrochloric acid is required.

To react with 0.50 moles of Zn, 1.0 mole of HCl is required according to the stoichiometry of the balanced chemical equation.

To determine how many moles of HCl are needed to react with 0.50 moles of Zn, we look at the balanced chemical equation:

Zn(s) + 2HCl(aq) → ZnCl₂(aq) + H₂(g)

According to the stoichiometry of the reaction, 1 mole of Zn reacts with 2 moles of HCl. Therefore, to react with 0.50 moles of Zn, we would need double that amount of HCl, which is 1.0 mole of HCl.

Answer:

The answer is B) No.

Explanation:

The equation balanced is:

2 FeCl₃ + 3 MgO → Fe₂O₃ + 3 MgCl₂

Equation balancing can be done by "trial and error" or by algebraic method.

In this way the equation is balanced on both sides having:

2 atoms of Fe, 6 of Cl, 3 of Mg and 3 of 0.

Final answer:

The chemical equation FeCl₃ + MgO → Fe₂O₃ + MgCl₂ is not balanced due to unequal numbers of iron, chlorine, and oxygen atoms on the reactant and product sides. The balanced equation would be 2FeCl₃ + 3MgO → Fe₂O₃ + 3MgCl₂.

Explanation:

The student's equation, FeCl₃ + MgO → Fe₂O₃ + MgCl₂, is not balanced. To determine whether a chemical equation is balanced, we must ensure that there are equal numbers of each type of atom on both the reactant and product sides. Let's count the atoms of each element in the reactants and products:

As we can see, the numbers do not match for iron and chlorine, as well as oxygen. Thus, the equation must be balanced by adjustion coefficients to equalize the number of atoms for each element on both sides. The balanced equation would be 2FeCl₃ + 3MgO → Fe₂O₃ + 3MgCl₂.

Answer:

positive one (+1)

Explanation:

sodium having atomic mass is twenty three (23) and atomic number is eleven (11).

Sodium atom having only one electron in it's outer most shell and it is easy for atom to lose this electron from outer most shell to make itself stable.

So after losing this electron positive charge on the upper right side of the atom will occur with the number of electron lose that is Na+1 .

Global warming is primarily driven by human activities that release greenhouse gases into the atmosphere.

The burning of fossil fuels (coal, oil, and natural gas) for energy production and transportation is the largest contributor, releasing carbon dioxide (CO₂) and methane (CH₄). Deforestation and land-use changes also play a significant role, as trees absorb CO₂, but their removal releases it back into the atmosphere.

Industrial processes, agriculture, and waste management release additional greenhouse gases. These gases trap heat in the Earth's atmosphere, leading to an increase in average global temperatures, disruptions in weather patterns, rising sea levels, and other climate-related impacts.

Learn more about Global warming, here:

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Answer: 2500 ml

Explanation:

To dilute a 500 mL solution of 5 M HCl to a 1 M HCl solution, 2000 mL of water must be added, using the formula M1V1 = M2V2 with the values substituted respectively.

The question involves diluting a concentrated solution to a lower concentration, specifically diluting a 500 mL solution of 5 M HCl to obtain a 1 M HCl solution. To solve this, the dilution equation, M1V1 = M2V2, is used. In this equation, M represents molarity, and V represents volume. Initially, we have M1=5 M, V1=500 mL, and M2=1 M. We need to find V2, the final volume after dilution.

Therefore, to dilute the 500 mL solution of 5 M HCl to a 1 M solution, 2000 mL of water needs to be added.

Answer:

A) pH = 2.8

B) pH = 5.5

C) pH = 8.9

D) pH = 13.72

Explanation:

a) [H⁺]  = 1.6 × 10⁻³ M

pH = -log [H⁺]

pH = -log [1.6 × 10⁻³ ]

pH = 2.8

b) [H⁺]  = 3 × 10⁻⁶

pH = -log [H⁺]

pH = -log [3 × 10⁻⁶ ]

pH = 5.5

c) [OH⁻] = 8.2 × 10⁻⁶

pOH = -log[OH]

pOH = -log[8.2 × 10⁻⁶]

pOH = 5.1

pH + pOH = 14

pH = 14 - pOH

pH = 14 - 5.1

pH = 8.9

d) [OH⁻] = 0.53 M

pOH = -log[OH]

pOH = -log[0.53]

pOH = 0.28

pH + pOH = 14

pH = 14 - pOH

pH = 14 - 0.28

pH = 13.72

Answer:

Arrow from sedimentary to metamorphic

Arrow from igneous to metamorphic

Explanation:

Metamorphic rocks can only be created under high pressure and temperature/chemical involvement

Hey there!

2 moles will be produced.

In N₂ there are 2 nitrogen atoms. In NH₃ there is 1 nitrogen atom.

So, there will be twice as many moles produced because there will be twice as many molecules.

Hope this helps!

Answer:

n = 1.9 ×10⁻⁵ mol

Explanation:

Given data:

Volume of hydrogen gas = 455 mm

Pressure of hydrogen gas = 101.3 kpa

Temperature = 29.1°C

Partial pressure of water vapor = 4.0 kpa

Number of moles of hydrogen gas = ?

Solution:

First of all we will convert the units.

Pressure of hydrogen gas = 101.3 kpa= 101.3/101 =  1 atm

Partial pressure of water vapor = 4.0 kpa = 4.0/ 101 = 0.04 atm

Temperature = 29.1 + 273 = 302.1 K

Volume of hydrogen gas = 455 / 1×10⁶ = 0.000455 L

Now we will calculate the total pressure.

Total pressure = Partial pressure of hydrogen gas + partial pressure of water vapors

Total pressure = 1 atm + 0.04 atm

Total pressure = 1.04 atm

Now we will calculate the number of moles;

PV = nRT

n = PV/RT

n =  1.04 atm × 0.000455 L / 0.0821 atm.L / mol.K × 302.1 K

n = 0.00047 /24.80/mol

n = 1.9 ×10⁻⁵ mol

Answer:

First, calculate the partial pressure of hydrogen by subtracting the total pressure of the hydrogen–water vapor mixture from the partial pressure of water vapor:

101.3 kPa − 4.0 kPa = 97.3 kPa.

Convert the temperature to kelvins:

29.1°C + 273.15 = 302.25 K.

Convert milliliters to liters by dividing by 1,000 to get 0.455 L.

Since the pressure is in kilopascals, use the R value 8.314 .

Now substitute the known values into the ideal gas equation:

n =  

n =  

n =  

n = 0.0176176 mol

n = 0.0176 mol

Explanation:

PLATO ANSWER!

Answer:

C―O is more polar.

Explanation:

Based on electronegativity values, C―O bond is the most polar one in the above options. Polarity of substance is depend on difference of electronegativity values between bonded atoms. Those atoms having high difference of electronegativity values are more polar as compared to those having less difference of electronegativity values. Electronegativity value of C―O bond is 0.89.

The chemical formula for lithium acetate is [tex]LiC_2H_3O_2[/tex]. It consists of one lithium ion [tex](Li^+)[/tex] and one acetate ion [tex](C_2H_3O_2^-)[/tex].

Lithium acetate is composed of lithium ions [tex](Li^+)[/tex] and acetate ions [tex](C_2H_3O_2^-)[/tex].

The formula indicates that for each lithium ion, there is one acetate ion. In chemical formulas, the subscripts indicate the number of atoms of each element present in the compound.

In this case, "Li" represents lithium, "C" represents carbon, "H" represents hydrogen, and "O" represents oxygen.

So, the formula [tex]LiC_2H_3O_2[/tex] indicates that there is one lithium atom, two carbon atoms, three hydrogen atoms, and two oxygen atoms in lithium acetate.

Answer:

Tough question

Explanation:

need more detail

Explanation:

The mass number of an element's atom is gotten by adding the number of protons and neutrons of the atom. Electrons have negligible mass compared to the protons and neutrons hence do not matter. The mass of a nuclear particle ( protons and the neutrons) is based on the 1/12 mass of carbon which is used as the standard for getting the mass of other elements.

If an element has isotopes the relative mass of the element is gotten by adding all the atomic mass numbers of the isotopes and dividing the sum by the number of isotopes.

Answer:

The right field is oceanography

Answer:

[tex]2.82\cdot 10^9 y[/tex]

Explanation:

A radioactive isotope is an isotope that undergoes nuclear decay, breaking apart into a smaller nucleus and emitting radiation during the process.

The half-life of an isotope is the amount of time it takes for a certain quantity of a radioactive isotope to halve.

For a radioactive isotope, the amount of substance left after a certain time t is:

[tex]m(t)=m_0 (\frac{1}{2})^{\frac{t}{\tau}}[/tex] (1)

where

[tex]m_0[/tex] is the mass of the substance at time t = 0

m(t) is the mass of the substance at time t

[tex]\tau[/tex] is the half-life of the isotope

In this problem, the isotope is uranium-235, which has a half-life of

[tex]\tau=7.04\cdot 10^8 y[/tex]

We also know that the amount of uranium left in the rock sample is 6.25% of its original value, this means that

[tex]\frac{m(t)}{m_0}=\frac{6.25}{100}[/tex]

Substituting into (1) and solving for t, we can find how much time has passed:

[tex]t=-\tau log_2 (\frac{m(t)}{m_0})=-(7.04\cdot 10^8) log_2 (\frac{6.25}{100})=2.82\cdot 10^9 y[/tex]

Answer:

The number of molecules in 14.0g of [tex]NO{_2}[/tex] is 1.806* 10^23

Explanation:

We were given;

Mass = 14.0g of [tex]NO{_2}[/tex]

First of all, we will calculate the molecular mass(MM) of [tex]NO{_2}[/tex]

Atomic number of Nitrogen, N=14  

Atomic number of Oxygen, O=16

MM of NO_2 = (14+{16*2})

MM of NO_2 = (14+32) = 46g/mol

Also, we find the number of moles in [tex]NO{_2}[/tex] using the formula below;

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molecular mass}}

\text{Number of moles}=\frac{14}{46}

\text{Number of moles}=0.3moles

Nitrogen dioxide, [tex]NO{_2}[/tex] therefore has 0.3moles.

In Chemistry, we know 1\text{ mole}=6.022\times 10^{23}\text{ molecules}

So, 0.3\text{ mole}=6.022\times 10^{23}\times 0.3\text{ molecules}

0.3\text{ mole}=1.806\times 10^{23}\text{ molecules}

Therefore, The number of molecules in 14g of [tex]NO{_2}[/tex] is 1.806 × 10^23

To determine the number of molecules in 14.0 g of NO2, convert the mass to moles using the molar mass of NO2, then use Avogadro's number to convert moles to molecules, we get answer 1.832 x 1023 molecules.

To determine the number of molecules in 14.0 g of NO2, we need to convert the mass of NO2 to moles. The molar mass of NO2 is 46.01 g/mol. Using the formula:

       Number of moles = Mass (g) / Molar mass (g/mol)

We can calculate:

       Number of moles = 14.0 g / 46.01 g/mol = 0.304 mol

Next, we need to use Avogadro's number to convert the number of moles to the number of molecules. Avogadro's number is approximately 6.022 x 1023 molecules/mol. Using the formula:

       Number of molecules = Number of moles × Avogadro's number

We can calculate:

       Number of molecules = 0.304 mol × 6.022 x 1023 molecules/mol = 1.832 x 1023 molecules

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Answer:

8L

Explanation:

Using Boyle's law which states that the volume of a given mass of gas is inversely proportional to the pressure, provided temperature remains constant

P1V1= P2V2

P1 =  2atm, V1 = 12L ,

P2 = 3atm , V2 =

12 × 2 = V2 × 3

Divide both sides by 3

V2 = 24 ÷ 3

V2 = 8L

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Answer:

Percent yield = 57%

Explanation:

Given data:

Number of moles of propane = 4.50 mol

Number of moles of carbon dioxide = 7.64 mol

Percent yield = ?

Solution:

Chemical equation:

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

Now we will compare the moles of propane and carbon dioxide.

                            C₃H₈            :            CO₂

                                 1               ;                3

                                  4.50        :              3×4.50 = 13.5 mol

Percent yield:

Percent yield = actual yield / theoretical yield × 100

Percent yield =  7.64 mol / 13.5 mol × 100

Percent yield = 0.57× 100

Percent yield = 57%