A 50.00 g sample of an unknown metal is heated to 45.00°C. It is then placed in a coffee-cup calorimeter filled with water. The calorimeter and the water have a combined mass of 250.0 g and an overall specific heat of 1.035 cal/g•°C. The initial temperature of the calorimeter is 10.00°C. The system reaches a final temperature of 11.08°C when the metal is added.

Answer:

A. Non-metal

B. Six

C. 2

D.NA2O

E.Oxygen

Explanation:

Oxygen is the element in the second period (second horizontal row) and Group VI A of the periodic table. These properties apply to oxygen

Answer:

there are 18 groups

Explanation:

Answer:

IA....... VIIIA. main groups (A groups)

IB....... VIIIB. sub groups (B groups)

totally they are 18

Answer:

A new type of technology that uses stem cells to grow body parts is called stem cell scaffolding.

Explanation:

"In stem cell transplants, stem cells replace cells damaged by chemotherapy or disease or serve as a way for the donor's immune system to fight some types of cancer and blood-related diseases, such as leukemia, lymphoma, neuroblastoma, and multiple myeloma. These transplants use adult stem cells or umbilical cord blood." - Mayo Clinic

Answer:

Chemist Dmitri Mendeleev

The formal charge of the nitrogen atom present at the center in dinitrogen sulfide is +1.

Formal charge:

The formal charge relates the presence of electrons on the atom when it is not present in a molecule and when it present in a molecule.

Lewis structure:

The structural representation of a compound by showing the electrons present around the atom with dots is called the Lewis dot structure.

The three possible Lewis structures of dinitrogen sulfide are shown below.

However, the best Lewis structure among those is first one. The central nitrogen atom is carrying a positive charge while the sulfur atom has a negative charge. The charges on these atoms are most stable thereby making the compound stable.

Therefore, the formal charge on the central nitrogen atom is +1.

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The mass of carbon dioxide that is produced will be 31,671 grams or 31.671 kg

First, the equation of the reaction:

[tex]C_3H_8(g)+5O_2(g)-- > 3CO_2(g)+4H_2O(g)[/tex]

The mole ratio of propane burned to carbon dioxide produced is 1:3.

The density of propane gas is 0.621 g/mL, thus, 17.0 L of propane will weigh:

        Density = mass/volume, mass = 0.621 g/mL x 17000 = 10,557 g

Mole of 10,557 g of propane = 10557/44.1 = 239.39 moles

Equivalent mole of carbon dioxide produced = 239.39 x 3 = 718.16 moles

Mass of 718.16 moles carbon dioxide = 718.16 x 44.1 = 31,671 grams or 31.671 kg

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The spontaneous disintegration of a nucleus into a slightly lighter and more radioactive nucleus is accompanied by the emission of particles, electromagnetic radiation, or both.

Radioactivity is the phenomenon of the spontaneous disintegration of unstable atomic nuclei into atomic nuclei to shape greater energetically strong atomic nuclei.

Radioactive decay is a tremendously exoergic, statistically random, first-order system that occurs with a small amount of mass being converted to strength.

Spontaneous disintegration of a radionuclide with the emission of lively particles or radiation, consisting of alpha or beta debris or gamma rays.

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Group Starts True

A rightward change in equilibrium.

The concentration of gases = [H2] will decrease, [N2] will increase, [NH3] will increase when the new equilibrium is reached.

Additional heat is produced.

The forward and backward reactions' rates quicken in the new equilibrium.

The equilibrium constant decreases as more heat is released.

the exothermic nature of the process.

The equilibrium constant would not have changed if the temperature had remained constant.

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In the solar cooker, reflective material like aluminum is used to collect and trap the heat from the sunlight while the interior is painted to reduce heat loss.

A solar cooker is a cooker which uses the energy of sunlight to cook food.

In designing a solar cooker, a solar collector such as reflective material like aluminum is used to collect and trap the heat from the sunlight.

The interior of the cooker is painted black to avoid heat loss by radiation.

Cardboard boxes are used as insulating materials.

In conclusion, a solar cooker is designed to maximize solar energy collected and minimize heat loss.

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The answer is Water is produced.

Activation energy is the energy needed to begin breaking the bonds of reactants and is denoted as option D.

These are the substances which take part in a chemical reaction and result in the formation of the product.

The activation energy is required as it breaks the bonds of the reactant thereby resulting in the product being formed. This therefore makes it the most appropriate choice.

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Answer:

False

Explanation:

The subscripts of chemicals can't be changed in a chemical reaction, otherwise the products or the reactants would be a completely different molecule. We can't just change O2 to being O3, but we can change O2 into 3/2 O2 (in some cases)

Planck's constant symbolized (h) relates the energy in one quantum (photon) of electromagnetic radiation to the frequency of that radiation.

The equation, E=hf, is referred to as the Planck relation or the Planck-Einstein relation. The letter h is named after Planck, as Planck's constant.

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0.4 M is the molarity of the solution.

The molarity of solution can be calculated by : [tex]C_M[/tex] = [tex]n/V[/tex] where,

n is the no. of moles of solute([tex]KMNO_4[/tex]) and

[tex]V[/tex] is the volume of the solution in L.

Now,

No. of moles can be calculated by: Given mass/ Molar mass

Molar mass of [tex]KMNO_4[/tex] is 158.034 g/mole

No. of moles of [tex]KMNO_4[/tex] = 36.1 g / 158.034 g/mole = 0.228 (app.) moles

Molarity of solution = 0.228 moles /0.566 L = 0.4 mol/L or 0.4 M

Hence, the molarity of a solution where 36.1 grams of potassium permanganate is dissolved in enough water to make 0.566 L of solution is 0.4 M

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Decomposition reaction represents the breakdown of single compound into more products.

A decomposition reaction is a type of reaction in which one reactant breaks down into two or more products. This can be represented by the general equation: H2O2 →  2H + 2O. In this example the breakdown of hydrogen peroxide occurs and  water and oxygen are formed.

Zinc reacts with dilute sulphuric acid to form zinc sulphate and hydrogen This hydrogen goes up into the atmosphere whereas the zinc sulphate remains.

Magnesium ribbon should be cleaned before burning in air because Magnesium metal combines with oxygen to form Magnesium Oxide (MgO) layer, which is a very stable molecule.

Arteries have thick, elastic walls, while veins have thin walls because arteries are under more pressure, as compared to veins that are under less pressure. Arteries are big in size whereas veins are small.

The role of valves in the heart is that these valves prevent the backward flow of blood.

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Compared to water, the pH of a buffer solution resist changes when the same small amount of a strong acid (such as HCl) or strong base (such as NaOH) is added to both.

A buffer solution, also known as a buffer, is a mixture of a weak acid and its conjugate base (or a mixture of a weak base and its conjugate acid). When a weak acid or a weak base is applied in modest amounts, buffer solutions withstand the pH shift.

The conjugate base of the buffer system reacts with a small amount of strong acid to change it into the weak acid of the buffer system. The pH then just slightly declines, the weak acid concentration rises, and the conjugate base concentration falls.

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Answer:

137.2 L

Explanation:

p1v1 = p2v2

p1v1 / p2 = v2

98 * 35  / 25 = v2 = 137.2 L

To find the volume of the balloon when the atmospheric pressure is 25.0 kPa at a height of about 25 km, we can use Boyle's Law,as per which volume is 137.2 L.

Boyle's law is an experimental gas law which describes how the pressure of the gas decreases as the volume increases. It's statement can be stated as, the absolute pressure which is exerted by a given mass of an ideal gas is inversely proportional to its volume provided temperature and amount of gas remains unchanged.

Boyle's Law equation: P₁  V₁ = P₂  V₂

Given:

P₁= 98.0 kPa (initial pressure of the balloon)

V₁ = 35.0 L (initial volume of the balloon)

P₂ = 25.0 kPa (final atmospheric pressure)

V₂= unknown (final volume of the balloon)

Plugging in the values into Boyle's Law equation, we have:

98.0 kPa × 35.0 L = 25.0 kPa × V₂

To find V₂, we can rearrange the equation:

V₂ = [tex]\dfrac{98}{35}\times{25}\\=137.2 \ L.[/tex]

Therefore, the volume of the balloon when the atmospheric pressure is 25.0 kPa at a height of about 25 km is approximately 137.2 L.

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The pH of this solution is 13.529.

Given:

Number of moles Ba(OH)₂ = 0.0550 moles

Volume = 325 mL

The calculation for moles:

[tex]Ba (OH)_{2}[/tex] → [tex]Ba^{2}[/tex]⁺ + [tex]2OH[/tex]

In 1 moles Ba(OH)₂  we have 2 moles OH-

In 0.0550 moles Ba(OH)₂  we have 2*0.0550 = 0.11 moles OH-

The calculation for concentration:

[OH-] = moles / volume

[OH-] = 0.11 moles / 0.325 L

[OH-] = 0.338 M

Calculation of pOH:

pOH = -log[OH-]

pOH = -log(0.338)

pOH = 0.471

Calculation of pH:

pH + pOH = 14

pH = 14 - pOH

pH = 14 - 0.471

pH = 13.529

Thus, the pH of this solution is 13.529.

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12 g CH3OH are produced when 14 grams of carbon monoxide reacts with 1.5 grams of hydrogen gas.

Writing the balanced equation for the reaction taking place:

CO(g) + 2H2(g) ⇒ CH3OH

Finding the limiting reactant:

moles CO present ⇒ 14 g x 1 mol CO / 28 g = 0.5 moles CO

moles H2 present ⇒ 1.5 g x 2 mol H2 / 2 g = 0.75 moles H2O

Because according to the balanced equation it takes 2 moles of H2 for every 1 mole CO, there isn't enough H2, so it is limiting and will dictate how much CH3OH can be made.

Mass of CH3OH produced

= 0.75 moles H2 x 1 mol CH3OH / 2 mol H2 x 32 g CH3OH / mol

=  12 g CH3OH

A synthesis response is a sort of reaction in which a couple of reactants combine to form a single product. it's a kind of chemical reaction wherein two or extra simple materials combine to shape a more complicated product.

it is surely a matter of creating connections or placing things collectively. We synthesize statistics evidently to help others see the connections between things. For example, whilst you document to a pal the matters that numerous other pals have said approximately a tune or movie, you're carrying out a synthesis.

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Rate of Reaction:

The factor that does not increase the rate of a reaction is "decreasing the concentration of the reactants".  

Factors that increase the rate of a reaction:

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Joseph Stalin didn't allow elections in the nations the Soviets occupied with their troops after World War II because: option B.

The Cold War was a period of open and intense conflict between the United States of America and the Soviet Union that developed almost immediately after World War II (Second World War).

Also, the Cold War officially started on the 12th of March, 1947 and came to an end on the 3rd of December, 1989.

Based on historical information and records, we can reasonably infer that Joseph Stalin didn't allow elections in the nations the Soviets occupied with their troops after World War II because he knew these nations would be anti-Soviet since they had waged war in these nations.

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Answer:

B.) A mixture can be separated by physical means.

Explanation:

While it may be difficult, mixtures can be separated back into their original elements/compounds. Compounds cannot be separated because their original elements/compounds bond together to form the new compound. The only way to separate compounds is through chemical (or drastic physical) means.

The force that  exists between particles in an ideal gas are  no attractive or repulsive forces between gas particles.

An ideal gas is a gas that obeys the ideal gas law. Ideal gases do not liquify at normal temperature and pressure since the gases do not interact.

Hence, the force that  exists between particles in an ideal gas are  no attractive or repulsive forces between gas particles.

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The equilibrium concentrations of all chemical species at room temperature are given below.

 H2(g)  +   I2(g) <-----> 2HI(g)

I              1          1                   0

c            -x        -x                  2x

E            1-x      1-x                 2x

[H2] ⇒ 1-x/1 = 1-x

[I2] ⇒ 1-x/1 = 1-x

[HI] ⇒ 2x

Kc = [HI]^2/[H2][I2]

55.3 = (2x)^2/(1-x)(1-x)

55.3 = (2x/1-x)^2

7.44 = 2x/1-x

7.44*(1-x) = 2x

x  = 0.788

[H2] ⇒ 1-x = 1-0.788 = 0.212M

[I2] ⇒ 1-x = 1-0.788 = 0.212M

[HI] ⇒ 2x = 2*0.788 = 1.576M

In a chemical reaction, while each reactant and the products are in a concentration that does not alternate with time any extra, it is said to be in a state of chemical equilibrium. in this kingdom, the price of forwarding response is the same as the rate of backward response.

Equilibrium is whilst the fee of the ahead reaction equals the charge of the opposite reaction. All reactant and product concentrations are consistent at equilibrium.

We are saying that a chemical is in an equilibrium concentration while the products and reactants do not change as time moves on. In different words, chemical equilibrium or equilibrium awareness is a state when the price of an ahead reaction in a chemical response will become equal to the rate of a backward response.

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The equilibrium concentrations of all chemical species at room temperature are given below.

[H2]  = 0.212M

[I2]  = 0.212M

[HI]  = 1.576M

H2(g)  +   I2(g) <-----> 2HI(g)

I              1          1                   0

c            -x        -x                  2x

E            1-x      1-x                 2x

[H2] ⇒ 1-x/1 = 1-x

[I2] ⇒ 1-x/1 = 1-x

[HI] ⇒ 2x

Kc = [HI]^2/[H2][I2]

55.3 = (2x)^2/(1-x)(1-x)

55.3 = (2x/1-x)^2

7.44 = 2x/1-x

7.44*(1-x) = 2x

x  = 0.788

[H2] ⇒ 1-x = 1-0.788 = 0.212M

[I2] ⇒ 1-x = 1-0.788 = 0.212M

[HI] ⇒ 2x = 2*0.788 = 1.576M

In a chemical reaction, while each reactant and the products are in a concentration that does not alternate with time any extra, it is said to be in a state of chemical equilibrium. in this kingdom, the price of forwarding response is the same as the rate of backward response.

Equilibrium is whilst the fee of the ahead reaction equals the charge of the opposite reaction. All reactant and product concentrations are consistent at equilibrium.

We are saying that a chemical is in an equilibrium concentration while the products and reactants do not change as time moves on. In different words, chemical equilibrium or equilibrium awareness is a state when the price of an ahead reaction in a chemical response will become equal to the rate of a backward response.

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Answer:

See below

Explanation:

Specific heat is  'c'

Q = m c  T      where T i s change in temp

675  = 55 c (118-25)

c = .13196      kJ / kg-C       ...I do not know what units you want....

                              this is also .13196 J/gm-C      

The original temperature of the copper is 145.4 °C

Temperature refers to the degree of hotness or coldness of a body. Now we know that the heat lost by the copper is equal to the heat gained by the water. The heat lost is negative while the heat gained is positive.

Hence;

-(mcdT)= mcdT

-(80.0 * 0.20 ( 26.9 - T)) = 100 * 4.12 * (26.9 - 22.3 )

-(430.4 - 16T) = 100 * 4.12 * (26.9 - 22.3 )

-430.4 + 16T = 1895.2

T =  1895.2 + 430.4 /16

T = 145.4 °C

The temperature of the copper is 145.4 °C.

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Answer:

Your answer must be O Photosynthesis or Respiration because

Explanation:

Photosynthesis involves the usage of carbon in the form of carbon dioxide by plants and algae.

Respiration involve the release of carbon dioxide in the environment by living organisms.

Hope its helpful!

Answer:

Your answer must be O Photosynthesis

Explanation:

43.8 has 3 significant figures and 1 decimal.

The term significant figures refer to the number of important single digits (0 through 9 inclusive) in the coefficient of an expression in scientific notation.

All zeros that occur between any two non-zero digits are significant. For example, 108.0097 contains seven significant digits. All zeros that are on the right of a decimal point and also to the left of a non-zero digit are never significant. For example, 0.00798 contained three significant digits.

Hence, 43.8 has 3 significant figures and 1 decimal.

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