How can we determine the number of significant figures in measurements?

Answer:

c

Explanation:

Answer:

C. 0.04 moles per cubic decimeter.

Explanation:

The molar mass of the Iodine is 253.809 grams per mole and a cubic decimeter equals 1000 cubic centimeters. The concentration of Iodine ([tex]c[/tex]), measured in moles per cubic decimeter, can be determined by the following formula:

[tex]c = \frac{m}{M\cdot V}[/tex] (1)

Where:

[tex]m[/tex] - Mass of iodine, measured in grams.

[tex]M[/tex] - Molar mass of iodine, measured in grams per mol.

[tex]V[/tex] - Volume of solution, measured in cubic decimeters.

If we know that [tex]m = 2.54\,g[/tex], [tex]M = 253.809\,\frac{g}{mol}[/tex] and [tex]V = 0.25\,dm^{3}[/tex], then the concentration of iodine in a solution is:

[tex]c = \frac{2.54\,g}{\left(253.809\,\frac{g}{mol} \right)\cdot (0.25\,dm^{3})}[/tex]

[tex]c = 0.04\,\frac{mol}{dm^{3}}[/tex]

Hence, the correct answer is C.

Answer:

La masa atómica del hierro es 55.847 gramos por mol.

Explanation:

Las masas molares de [tex]Fe_{54}[/tex], [tex]Fe_{56}[/tex], [tex]Fe_{57}[/tex] y [tex]Fe_{58}[/tex] son 53.940 gramos por mol, 55.935 gramos por mol, 56.935 gramos por mol y 57.933 gramos por mol, respectivamente. La masa atómica del hierro se determina mediante el siguiente promedio ponderado:

[tex]M_{Fe} = \frac{5.82}{100}\times \left(53.940\,\frac{g}{mol} \right)+\frac{91.66}{100}\times (55.935\,\frac{g}{mol})+\frac{2.19}{100}\times \left(56.935\,\frac{g}{mol} \right)+\frac{0.33}{100}\times \left(57.933\,\frac{g}{mol} \right)[/tex]

[tex]M_{Fe} = 55.847\,\frac{g}{mol}[/tex]

La masa atómica del hierro es 55.847 gramos por mol.

Answer:

Mass = 19.0 g

Explanation:

Given data:

Mass of limestone react = ?

Mass of lime produced = 11.2 g

Solution:

Balanced chemical equation:

CaCO₃     →      CaO + CO₂

Number of moles of lime:

Number of moles = mass / molar mass

Molar mass of lime 56.1 g/mol

Number of moles = 11.2 g/ 56.1 g/mol

Number of moles = 0.19 mol

Now we will compare the moles of CaO and CaCO₃

                     CaO        :           CaCO₃

                       1             :             1

                     0.19          :          0.19

Mass of limestone react:

Mass = number of moles × molar mass

Mass = 0.19 mol × 100.1 g/mol

Mass = 19.0 g

Answer:

An object could be traveling at a constant speed, but change directions

Explanation:

Hope that helps

Answer:he

H

Explanation:

541 grams is the mass of [tex]4.98\times 10^{24}[/tex] atoms of Zn.

Explanation:

Given

The number of zinc atoms =[tex]4.98\times 10^{24}[/tex]

To find:

The mass of given atoms of zinc atoms

Solution:

The number of zinc atoms =N=[tex]4.98\times 10^{24}[/tex]

According to mole concept:

1 mole = Avogadro 's Number = [tex]N_A= 6.022\times 10^{23} atoms/ molecules/ions[/tex]

Let the moles of zinc be = n

Number of atoms in n moles of zinc will be:

[tex]N=n \times N_A\\4.98\times 10^{24} atoms= n\times 6.022\times 10^{23} atoms\\n=\frac{4.98\times 10^{24} atoms}{ 6.022\times 10^{23} atoms}=8.27[/tex]

Moles of zinc = 8.27 mol

Molar mass of zinc = 65.38 g/mol

Mass of 8.27 moles of zinc:

[tex]=8.27\times 65.38 g/mol=540.67 g\approx 541 g[/tex]

541 grams is the mass of [tex]4.98\times 10^{24}[/tex] atoms of Zn.

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Answer:

One of the main functions lipids do is storing energy.

provide the building blocks for muscle tissue

Answer:

c

Explanation:

edge

Answer:

What question?

Explanation:

Answer:

how u doing good?

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helloooo

Answer:

Glucose

Explanation:

Photosynthesis is the process of the transformation of the light energy from the Sun into stored chemical energy that can serves as the major source of energy in the food chain

The overall chemical equation for photosynthesis reaction can be presented as follows;

6CO₂(g) + 12H₂O(l) + Light Energy → C₆H₁₂O₆ + 6O₂ + 6H₂O

During cellular respiration, the energy in the glucose, C₆H₁₂O₆, is converted to energy stored in Adenosine Triphosphate (ATP) molecules which are released when the the ATP is converted into Adenosine Diphosphate (ADP)

C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + Energy containing ATP

Answer:

the Mantle

Explanation:

Answer:

Molten lava

Explanation:

I'm learning the same thing :)

Answer:

a substance that can dissolve other molecules and compounds, which are known as solutesBecause of its ability to form hydrogen bonds, , meaning that it can dissolve many different kinds of molecules.

Explanation:

The concentration in mol/L of the chemist's potassium iodide solution : = 4.4 x 10⁻⁴ M

Given

88. μmol of Potassium iodide

200. mL volumetric flask

Required

The concentration

Solution

Molarity is a way to express the concentration of the solution

Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution

[tex]\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}[/tex]

Conversion :

88. μmol = 88 . 10⁺⁶ mol = 8.8 10⁻⁵ mol

200 ml = 0.2 L

The molarity :

= n : V

= 8.8.10⁻⁵ : 0.2

= 4.4 x 10⁻⁴ M

The question is incomplete, the complete question is;

Zinc and sulfur react to form zinc sulfide by the equation shown below. How many grams of ZnS can be formed when 12.0 g of Zn reacts with 6.50 g of S? (Atomic mass: Zn = 65.38, S = 32.06).

Answer:

17.5 g of ZNS

Explanation:

The equation of the reaction is;

Zn(s) + S(s) ------->ZnS(s)

Number of moles of Zn = 12.0/65.38 = 0.18 moles

Number of moles of S = 6.50/32.06 = 0.20 moles

Hence Zn is the limiting reactant

If 1 mole of Zn yields 1 mole of ZnS

Then 0.18 moles of Zn also yields 0.18 moles of ZnS

Mass of ZnS produced = 0.18 moles *  97.44 g/mol = 17.5 g of ZNS

Answer:

17.5 g of ZNS

Explanation:

Answer:

A reaction at equilibrium implies that the concentration/amount of reactants & products present in that reaction don't change but will remain constant. It could also mean that the forward reactions and reverse reactions will occur at the same rates.

Explanation:

A reaction at equilibrium implies that the concentration/amount of reactants & products present in that reaction don't change but will remain constant. It could also mean that the forward reactions and reverse reactions will occur at the same rates.

Answer:

[tex]C+O_2\ \overrightarrow{Pd} \ CO_2[/tex]

Explanation:

Hello!

In this case, since the catalytic reactions involve the presence of a catalyst that decrease the activation energy of the undergoing chemical reaction, when we need to include it in the chemical equation, we usually put on or underneath the reaction arrow, just as shown below:

[tex]C+O_2\ \overrightarrow{Pd} \ CO_2[/tex]

Best regards!

Answer:

D

Explanation:

Same Wavelength. Also cause i did the test

Answer:

They have the same wavelenght

Explanation:

Answer:

Ok to solve this you will need to use the Ideal Gas Law Formula which is as follows:

PV = nRT

P= pressure

V= volume

n= # of moles

R= Universal Gas Constant (0.0821 L x atm/mol x K)

T= Kelvin temperature

1.Simplify the Ideal Gas Law formula to what you need to solve for:

P = (nRT)/ V

2. List all you components as follows (this makes the process easier):

P = ?

V = 45.4 L

n = 0.625 mol

R = 0.0821 L x atm/ mol x K

T = 249 K

To find the Kelvin temperature K = C + 273

3. Plug in all your components in your set up formula:

P = [(0.625 mol)(0.0821 L x atm/ mol x K)(249 K)] / (45.4 L)

4. Cross out all similar units so the only thing left is atm because you are trying to find pressure.

P = [(0.625)(0.0821atm)(249)] / (45.4)

5. Multiply through and simplify

P = 0.28 atm

B. is the correct answer.

Glad I could help!! If you have any other questions just message me. Hopefully this was helpful.

Explanation:

Answer:

a. Cellular Respiration produces more ATP than Anaerobic Respiration.

Explanation:

Cellular Respiration creates a total of 36-38 ATP per round. Anaerobic processes only produce 2 ATP per cycle.

Answer: H-H

Explanation: it’s symmetrical on both sides

The structural formula of the nonpolar molecule is H-H. Therefore, option (3) is correct.

A molecule that does not have the charges present at the end as the electrons are finely distributed and symmetrically cancels out each other is a non-polar molecule. A polar molecule cannot be mixed with a non-polar molecule in a solution.

Water is a polar molecule that does not mix with oil as it is a non-polar molecule. Non-polar molecules have a net dipole moment of zero as the dipoles of the atoms are canceled out within the molecule.

Non-polar bonds have formed because the difference in the electronegativities of atoms is less than 0.5. Non-polar bonds do not are generally formed in compounds where there is a presence of symmetry.

The HCl has differences in the electronegativities of hydrogen and chlorine atoms. Therefore, HCl is a polar molecule. Ammonia is also a polar molecule due to the difference in the electronegativities H and N.

Therefore, the Hydrogen molecule (H-H) is a nonpolar molecule as the electronegativity difference is zero.

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Answer:

The pennies represent the particles of the isotope either decaying, or staying the same after each shake.  This is a random process.  

In this lab, the pennies represent the nuclei of radioactive substances

Radioactive substances are the unstable substances as they ahve unstable nuclei and will attain stability after the decay of nuclei in the form of emission of alpha, beta or gamma rays.

In the given lab report, the word pennies is used to represent the nuclei of radioactive substances which undergo radioactive decay or remain same.

Hence pennies is used to represent radioactive substances.

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Answer:

im not sure but i do know you have to look under 5.2

Explanation:

The volume of CO= 2.912 L

Given

Dehydration of 6 g of methanoic acid with H2SO4

Required

The volume of CO

Solution

Reaction

HCOOH  ⇒​  CO+H₂O

MW = 1.Ar C+2.Ar H+2.Ar O

MW = 1.12+2.1+2.16

MW= 46 g/mol

mol = mass : MW

mol = 6 g : 46 g/mol

mol = 0.13

From equation, mol ratio HCOOH  : CO, so mol CO = 0.13

Vm = 22.4 L

so for 0.13 mol :

= 0.13 x 22.4 L

= 2.912 L

Answer: Electron

Explanation:

An orbital is a region in an atom where there is a high probability of finding an electron.

Answer:

В.  No, because the mass of the reactants is less than the mass of the products.

Explanation:

Chemical equation:

NaBr + Cl₂      →      2NaCl + Br₂

The given equation is not balanced because number of moles of sodium and bromine atoms are less on reactant side while more on the product side.

There are one mole of sodium and one mole of bromine atom on left side of equation while on right side there are 2 moles of bromine and 2 moles of sodium atom are present. The number of moles of chlorine atoms are balanced.

Balanced chemical equation:

2NaBr + Cl₂      →      2NaCl + Br₂

Now equation is balanced. Number of moles of sodium , chlorine and bromine atoms are equal on both side.

Answer:

It is not true that this is an example of a chemical reaction. This is a typical example of physical reaction.

Most physical changes are often phase changes.

A phase change is a change in the physical state of a body.

In this change, it is from solid to liquid.

Now new substances are formed.

When substances are changed from one form to another, it is a physical change.

In a chemical change, a new substance is formed at the end of the process.

Explanation:

yess of course

if you study the steps of melting the iron and makes the ores pure, you will know that there's many reaction happen to convert to wires

Answer:

 ok        ,

Explanation:

     .

Answer:

there is no limiting reactant.

Explanation:

Given that:

CaF₂  +  Br₂  ----->     CaBr₂  + F₂

From the above equation;

We can see that there is an equal number of moles in the reactant side of the equation.

i.e.

one mole of CaF₂  reacts with one mole of Br₂.

Thus, there is no limiting reactant.

There will be no limiting reactants as the chemical equation has the reactant totally consumed and thus leading to no reactants.

We can see that there's an identical range of moles withinside the reactant aspect of the equation

It is the substance that gets into the chemical reaction.

Thus, there's no proscribing reactant.

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