A cubic piece of platinum metal (specific heat capacity = 0.1256 J/°C･g) at 200.0°C is dropped into 1.00 L of deuterium oxide ('heavy water,' specific heat capacity = 4.211 J/°C･g) at 25.5°C. The final temperature of the platinum and deuterium oxide mixture is 41.9°C. The density of platinum is 21.45 g/cm³ and the density of deuterium oxide is 1.11 g/mL. What is the edge length of the cube of platinum, in centimeters?

The energy released in the formation of a nucleus from its component nucleons is called the binding energy of the nucleus. The mass defect is 2.0 x 10⁻² kg/mol​. The correct option is D.

The mass defect is defined as the mass lost as an equivalent amount of energy during the formation of a given nucleus from the component nucleons.

The equation connecting binding energy and mass defect is:

Binding energy = Δm × c²

c - Velocity of light

Δm - Mass defect

Δm = Binding energy / c²

= 1.8 x 10¹⁵ / (3 × 10⁸)²

= 2.0 x 10⁻² kg/mol

Thus the correct option is D.

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The mass of water that can be obtained is 2.2 g of water.

We know that in the case that we have here, we are going to depend on the stoichiometry of the reaction and this is very important in the determination of the amount of the water that can be formed.

Now we can see that the reaction equation can be written from the fact that; \(2H_{2} (g) + O_{2} (g) ---- > 2H_{2} O(g)\). Then we can see that in this kind of chemical reaction we have to apply the stoichiometry.

Number of moles of the hydrogen = 14.8g/2 g/mol = 7.4 moles

Number of moles of oxygen = 34.8 g/32 g/mol = 1.1 moles

Given that 2 moles of hydrogen reacts with 1 mole of oxygen

7.4 moles of hydrogen reacts with 7.4 * 1/2

= 3.7 moles

Hence oxygen is the limiting reactant.

1 mole of oxygen produces 2 moles of water

1.1 moles of oxygen would produce 1.1 * 2/1

= 2.2 moles of water

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Evidence other than the CMB provides support for the Big Bang theory is redshift proposed by Edwin Hubble.

The redshift that was suggested by Edwin Hubble is yet another piece of evidence that supports the Big Bang idea. His finding confirmed the theory that the universe is expanding as a result of the other galaxies' light's redshift.

Edwin Hubble declared in 1929 that nearly all galaxies looked to be revolving away from us. He discovered that the cosmos was actually expanding, with all of the galaxies moving apart. The spectrum of a galaxy was seen to change toward red due to this occurrence.

Edwin Hubble made two significant changes to our knowledge of the universe over the span of five years, contributing to the development of the Big Bang theory. He first showed that the universe is far bigger than previously believed before proving that it is expanding.

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Answer:

The solubility of alkaline earth metal hydroxides in water increases down the group because the size of the metal cation increases as you move down the group. This increase in size results in a decrease in the cation's charge density, which makes it less able to attract and hold onto hydroxide ions. As a result, the hydroxides become more soluble in water as you move down the group. Additionally, the lattice energies of the hydroxides decrease down the group, making it easier to break apart the crystal lattice structure and dissolve the hydroxides in water.

Answer :Examples of chemical changes include combustion (burning), cooking an egg, rusting of an iron pan, and mixing hydrochloric acid and sodium hydroxide to make salt and water.

Answer:

4 CO + 8 H2 -> 4 CH3OH

Hope that it works

Answer:

Is it the nitric acid reaction

Explanation:

Today, chloropicrin is manufactured by the reaction of nitromethane with sodium hypochlorite: H3CNO2 + 3 NaOCl → Cl3CNO2 + 3 NaOH. or by the reaction of chloroform with nitric acid: CHCl3 + HNO3 → CCl3NO2 + H2O.

Answer:

60 days

Explanation:

2500 = 40000 ( 1/2) ^n

n = 4 half lives

4 half lives * 15 days/ halflife = 60 days

Answer:

I need this too but nobody knows how :(

Explanation:

Answer:

Potassium Chloride (i think)

Explanation:

If you take a look at the visible light spectrum, the salts that burned violet/purple would produce the greatest energy. I forgot what color these salts burned through but a quick search and Potassium Chloride burns violet/white which has the highest energy wavelengths.

Answer:

Natural BGH and rBGH both increase the level of another hormone called insulin-like growth factor (IGF-1) in the cow.

Beef cattle are often given steroids to increase and speed growth. Common steroids include:

Major groups such as FDA and Food and Agricultural Organization state track level of hormones in food. They state that the levels of hormones in food are safe to eat. Not everyone agrees.

Explanation:

Hormones are present in all animal products. Some are natural, others may be added through supplements. Hormones and steroids are given to livestock. It can increase the number of dairy products and beef.

FDA establishes the acceptable safe limits for hormones in meat. A safe level for human consumption is a level of drug in the meat that would be expected to have no harmful effect in humans based on extensive scientific study and review.  

Answer:

C6H12O6

Explanation:

C6H12O6

Answer:

61.9 g C3H8

Explanation:

First write and balance equation

C3H8 + 5O2 -> 3CO2 + 4H2O

Next find the limiting reactant

25.0g propane/ 44.097 g propane = 0.567 mol propane

(75.0gO2)(1mol C3H8)/ (32g)(5mol O2)= 0.468 mol propane

Since O2 is the limiting reactant now we can find the mass of CO2

(75.0g O2)(1 mol O2)( 3 mol CO2)(44.01 g CO2)/(32g O2)(5 mol O2)( 1 mol CO2) =61.9g CO2

The decomposition of aspirin (acetylsalicylic acid,\(C_{9} H_{8} O_{4}\)) can occur through the hydrolysis reaction, resulting in the formation of acetic acid (\(CH_{3} COOH\)) and salicylic acid (\(C_{7} H_{6}O_{3}\)).

The decomposition of aspirin (acetylsalicylic acid, \(C_{9} H_{8} O_{4}\)) can occur through the hydrolysis reaction, resulting in the formation of acetic acid (\(CH_{3} COOH\)) and salicylic acid (\(C_{7} H_{6}O_{3}\)). To determine the moles of each product formed, we need to consider the balanced chemical equation for the reaction:

\(C_{9} H_{8} O_{4} = > C_{7} H_{6}O_{3} +CH_{3} COOH\)

From the equation, we can see that for every 1 mole of aspirin, 1 mole of salicylic acid and 1 mole of acetic acid are produced.

Therefore, the moles of salicylic acid and acetic acid formed will be equal to the number of moles of aspirin that decomposes. If we know the amount of aspirin in moles, we can directly calculate the moles of each product based on stoichiometry.

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In the electrical arrangement, the 6p subshell of the radon element contains 6 electrons.

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Answer:

D

Explanation:

took the test and got it right

Answer:

D. exchange of energy with the surroundings

Explanation:

Got it right on edge.

The sample of nitrogen gas will occupy 236.54 mL of volume at 1.05 atm pressure.

Boyle's law is the ideal law that defines the relationship between pressure and volume of gases. A law is given if the temperature is kept constant. Pressure and volume exhibit an inverse relationship.

The Boyle's Law is given as:

P₁V₁ = P₂V₂

Given,

Initial pressure (P₁) = 0.974 atm

Initial volume (V₁) = 255 mL

Final pressure (P₂) = 1.05 atm

Final volume = V₂

The final volume at 1.05 atm is calculated by substituting values in Boyle's Law as:

P₁V₁ = P₂V₂

0.974 × 255 = 1.05 V₂

V₂ =  248.37 ÷ 1.05

= 236.54 mL

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There are approximately 6.022 × 10^23 atoms in 12 grams of Carbon-12 (12C).

The number of atoms in a given amount of a substance can be calculated using Avogadro's number, which represents the number of atoms or molecules in one mole of a substance. Avogadro's number is approximately 6.022 × 10^23.

Carbon-12 is a specific isotope of carbon, with an atomic mass of 12 atomic mass units (amu). One mole of Carbon-12 has a mass of 12 grams. Since one mole of any substance contains Avogadro's number of particles, in the case of Carbon-12, it contains 6.022 × 10^23 atoms.

Therefore, if we have 12 grams of Carbon-12, which is equal to one mole, we can conclude that there are approximately 6.022 × 10^23 atoms in this amount of Carbon-12.

In summary, 12 grams of Carbon-12 contains approximately 6.022 × 10^23 atoms. Avogadro's number allows us to relate the mass of a substance to the number of atoms or molecules it contains, providing a fundamental concept in chemistry and enabling us to quantify and understand the microscopic world of atoms and molecules.

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Answer:

The options to this question are incomplete. The remaining two options are:

C. Water expands and becomes less dense when it freezes.

D. Water contracts and becomes less dense when it freezes.

The answer is C. Water expands and becomes less dense when it freezes.

Explanation:

Water is a chemical compound that exists in the three states of matter viz: solid as ICE, gas as vapour and liquid as WATER. However, due to the DENSITY properties of each state, ice floats on water. Ice is less dense than water.

When liquid water freezes, it's particles expands i.e increases in volume. Hence, it becomes less dense than water. This causes an iceberg to float on water because it has a lesser density compared to the liquid water caused by an expansion of its particles.

Answer:

answer is c

Explanation:

Answer:

its has to be AAAAAAAAAA

Answer:

The answer is A

Explanation:

Answer:

If the voltage of circuit A is equal to the voltage of circuit B, then the current in circuit A is less than the current in circuit B

Explanation:

To know the the correct answer to the question, do the following:

Case 1: Let the circuit A and B have equal voltage say 24 V.

For Circuit A:

Voltage (V) = 24 V

Resistance (R) = 7.5 ohms

Current (I) =?

V = IR

24 = I × 7.5

Divide both side by 7.5

I = 24 / 7.5

I = 3.2 A

For Circuit B:

Voltage (V) = 24 V

Resistance (R) = 5 ohms

Current (I) =?

V = IR

24 = I × 5

Divide both side by 5

I = 24 / 5

I = 4.8 A

Thus for the same voltage, current in circuit A is less than the current in B.

Case 2: Let circuit A and B have equal current say 2 A

For circuit A:

Current (I) = 2 A

Resistance (R) = 7.5 ohms

Voltage (V) =?

V = IR

V = 2 × 7.5

V = 15 V

For Circuit B:

Current (I) = 2 A

Resistance (R) = 5 ohms

Voltage (V) =?

V = IR

V = 2 × 5

V = 10 V

Thus, for the same current, the voltage in circuit A is greater than the voltage in B

Case 3: Let circuit A have a current of 4 A and circuit B have a current of 5 A

For circuit A:

Current (I) = 4 A

Resistance (R) = 7.5 ohms

Voltage (V) =?

V = IR

V = 4 × 7.5

V = 30 V

For circuit B:

Current (I) = 5 A

Resistance (R) = 5 ohms

Voltage (V) =?

V = IR

V = 5 × 5

V = 25 V

Thus, when the current in circuit A is less than the current in circuit B, the voltage in circuit A is greater than the voltage in circuit B.

From the illustrations above and the options given in the question, the current answer is:

If the voltage of circuit A is equal to the voltage of circuit B, then the current in circuit A is less than the current in circuit B

Answer:

11.2g of the 45% pure silver and 2.8g of the 50% pure silver.

Explanation:

14g of 46% pure silver contains:

14g*46% = 6.44g of silver are required. Thus, we can write:

6.44 = X*50% + Y*45% (1)

Where X is the mass of 50% pure silver and Y the mass of 45% pure silver.

As the mass of the sample must be 14g:

14g = X + Y (2)

Replacing (2) in (1):

6.44 = (14-Y)*50% + Y*45%

6.44 = 7 - 0.5Y + 0.45Y

-0.56 = -0.05Y

Y = 11.2g of the 45% pure silver

And:

14g-11.2g = X

X =

2.8g of the 50% pure silver

The required amount to obtain 14g of 46% pure silver is 2.8g of 50% silver and 11.2g of 45% silver.

To solve this question, we can assume it's a mathematical problem more than a chemistry problem.

let x represent the amount of 45% of pure Ag

let y represent the amount of 50% of pure Ag

But from the question, we only need 14g from both x and y

We can write an equation to represent this

\(x+y=14...equation(i)\)

likewise, we can say that

\(0.45x+0.50y=14*0.46\\0.45x+0.50y=6.44...equation(ii)\)

Solving both equations simultaneously,

\(x+y=14...equation(i)\\0.45x+0.5y=6.44...equation(ii)\)

from equation (i)

\(x+y=14\\x=14-y...equation(iii)\)

substitute equation (iii) into equation (ii)

\(0.45x+0.5y=6.44\\x=14-y\\0.45(14-y)+0.5y=6.44\\6.3-0.45y+0.5y=6.44\\\)

collect like terms

\(-0.45y+0.50y=6.44-6.3\\0.05y=0.14\\y=\frac{0.14}{0.05}\\y=2.8\)

Now we know the value of the 50% Ag which is 2.8g. Let's substitute it's value into equation (i) and solve for x

\(x+y=14\\x+2.8=14\\x=14-2.8\\x=11.2g\)

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about 13 g

The soda cans are sold as containing 12 ounces, or 355 ml, of liquid. This leaves just under 25 ml head space. The can itself is about 13 g.

After heating the crucible, cooling, and weighing the sample as 0.739 g, the students should have heated the crucible again and then reweigh the sample until a constant weight is obtained.

The sample being heated, CaCl2 2 H2O, contains water of hydration.

In order to arrive at an anhydrous sample of the salt, all the water molecules must be completely evaporated off by heating.

To do so, the sample should have been heated to constant weight by repeated heating and weighing until there is no longer a change in the weight of the sample.

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Answer:

By taking the volume of the container.

Answer:

By taking the volume of the container

Explanation:

it does not have any specific volume or shape, so the way it volume is the volume of container.

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Answer:

A. CODIS

Explanation:

The Combined DNA Index System (CODIS), administered by the FBI, maintains DNA profiles obtained through federal, state, and local DNA sample collection programs, and makes this information available to law enforcement agencies across the country for law enforcement identification purposes.

Answer:

B: Na(s) + Cl2(g) + 3O2(g) = 2NaClO3(s)

Explanation:

We are looking for enthalpy of formation, so we want to see reactance in their natural standard form.

Thus, we want to see the reactance of Na, Cl2 and O2.

The only option that has the correct form of Na, Cl2 and O2 is B.

Na(s) + Cl2(g) + 3O2(g) = 2NaClO3(s)

Answer:

5230 J

Explanation:

m = 25 g = 0,025 kg

c = 4,184 J /(g * °C) = 4184 J /(kg * °C)

\(t_{1}\) = 80 °C

\(t_{2}\) = 30 °C

The formula is Q = c *m * (\(t_{2} - t_{1}\))

Calculating:

Q = 4184 * 0,025 * (30 - 80) = 5230 J

Note that we get a negative heat (-5230 J). It just means that it is released.

The amount of heat will be 5230 j.

What is heat?

Heat is a type of energy that is transferred between both the system and its surroundings as a result of temperature variations.

Calculation of heat.

Given data:

Mass = 25.0 g = 0.025 kg

C = 4.184 J/g°C

\(T_{1}\) =  80.0°C

\(T_{2}\) = 30.0°C

Q= ?

By using the formula of heat.

Q = MC (\(T_{2} - T_{1}\))

Put the value of given data in heat equation.

Q(heat)  = 0.025  × 4.184  ( 30 - 80)

Q(heat) = 5230 J.

Therefore, the amount of heat will be 5230 J.

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