Christina has three substances. Each substance is a cube with a volume of 6 milliliters. She is going to place all three substances in a tub of water and wants to know which will float. Substance A has a mass of 4 grams, substance B has a mass of 8 grams, and substance C has a mass of 10 grams. Part A Which substance will float? Part B Explain how you know which substance will float. ​

Answer:

c.dull appearance

Explanation:

Nonmetals are dull,poor conductors of heat and electricity that have lower melting points than metals,the rest of the answer choice are properties of metal.

Hope this helps :)

Answer:

molecular mass = 78

Empirical Formula is

C= 92.3/12= 7.69

H= 7.68/1= 7.68

therefore Empirical formula is

CH

molecular formula is

(CH)n= 78

(12+1)n=78

n=78/13

n=6

molecular formula is

C6H6

Answer:

"The phenomenon of static electricity requires a separation of positive and negative charges. When two materials are in contact, electrons may move from one material to the other, which leaves an excess of positive charge on one material, and an equal negative charge on the other."

Explanation:

Sited from Wikipedia

The electronic configuration can be used to know the details of atom.

The question is incomplete so I will educate you generally about electronic configuration.

The electronic configuration of an atom refers to the arrangement of electrons in its energy levels or orbitals.

The electrons in an atom occupy specific energy levels, with the innermost energy level having the lowest energy and being occupied by the most electrons. Each energy level can contain a certain number of electrons, and electrons occupy the lowest energy level available to them.

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Answer:

fdhhdhdhdhhshdgdvdvebehbehdhehdhhddhdf

Answer:

No Se Espanol

Explanation:

Answer:

yep!

Explanation:

The molarity of the solution is 5.428 M, with 4 significant figures.

To calculate the molarity of a solution, we need to know the amount of solute (in moles) and the volume of the solution (in liters).

Molarity = moles of solute / volume of solution in liters

First, we need to calculate the amount of KCI in moles:

Mass of KCI = 101.00 g

Molar mass of KCI = 39 + 35.5 = 74.5 g/mol

Number of moles of KCI = mass / molar mass = 101.00 g / 74.5 g/mol = 1.357 mol

Next, we need to convert the volume of the solution to liters:

Volume of solution = 250.0 mL = 0.250 L

Finally, we can calculate the molarity:

Molarity = 1.357 mol / 0.250 L = 5.428 M

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Current (in a) is required to plate out 1.22 g of nickel from a solution of ni2 in 0.50 hour:  2.22 A. The correct option is B

The amount of electric charge required to deposit 1 mole of nickel is 2 × 96,485 C (Faraday's constant). The molar mass of nickel is 58.69 g/mol. Thus, the amount of electric charge required to deposit 1.22 g of nickel is: Q = (1.22 g / 58.69 g/mol) × (2 × 96,485 C/mol) = 4,014 C

The current (I) can be calculated using the formula: I = Q / t

where t is the time in seconds. We are given the time in hours, so we need to convert it to seconds: t = 0.50 hour × 60 min/hour × 60 s/min = 1,800 s

Now we can calculate the current: I = 4,014 C / 1,800 s ≈ 2.23 A. Therefore, the answer is B) 2.22 A.

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Complete question:
What current (in A) is required to plate out 1.22 g of nickel from a solution of Ni2+ in 0.50 hour? 34)

A) 4.46  B) 2.22  C) 12.9 D) 65.4 E) 8.02×10³

Answer:

The final temperature is  39.58 degree Celsius

Explanation:

As we know

Q = m * c * change in temperature

Specific heat of water (c) = 4.2 joules per gram per Celsius degree

Substituting the given values we get  -

5750 = 335 * 4.2 * (X - 35.5)

X = 39.58 degree Celsius

The reaction between pottasium metal and chlorine gas is a combination reaction and it is as follows;

2K + Cl₂ → 2KCl

A chemical reaction is a process involving the breaking or making of interatomic bonds, in which one or more substances are changed into others.

A chemical reaction is said to be a combination reaction when two or more atoms are joined together to form a compound. An example is the reaction of pottasium metal and chlorine gas to produce pottasium chloride as follows:

2K + Cl₂ → 2KCl

In the above equation, two elements; pottasium chemically combines with chlorine to form a compound; pottasium chloride.

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Dry ice in an ice-cream cart disappears  on sublimation .

In general , because of the process of absorption of heat , dry ice when present in the solid state is directly transformed directly into a gas without being converted into a liquid state and thus disappears. Dry ice get physical transformation by the process of sublimation that is from solid to the gaseous state without melting into a liquid.

Hence , we  can say that sublimation is a process that is used to explain  about the process of snow and ice changing into water vapor (gas) in the air without melting into water. Dry ice is generally present in solid state, that get to sublimate, or turn to gas, at a chilly -78.5 °C.

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If we add one proton to  10B we obtain 10C.

An atom is the smallest part of a substance that can take part in a chemical reaction. We know that an atom is composed of an electron, a proton and a neutron.

The number of protons in an atom is the atomic number of the atom and it can be used to identify the atom. If two atoms have the same number of protons then they must be isotopes of each other.

Not that the isotopes have the same physical and chemical properties because they are actually the same element and only differ in the number of neutrons that is in the nucleus of each atom.

Now, the element boron has five electrons and protons.  10B has five electrons, protons and neutrons. If we add one proton to  10B we obtain 10C.

If we add one neutron to  10B we obtain 11B. Only 11B is an isotope of boron, the atom 10C belongs to a different element.

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Answer:

13.18

Explanation:

We'll begin by calculating the hydrogen ion concentration, [H⁺] in the solution. This can be obtained as follow:

HCl (aq) —> H⁺(aq) + Cl¯(aq)

From the balanced equation above,

1 mole of HCl dissociate to produce 1 mole of H⁺.

Therefore, 0.15 M HCl will also dissociate to produce 0.15 M H⁺.

Thus, the concentration of the hydrogen ion, [H⁺] in the solution is 0.15 M.

Next, we shall determine the pH of the solution. This can be obtained as follow:

Concentration of the hydrogen ion, [H⁺] = 0.15 M.

pH =?

pH = – Log[H⁺]

pH = – Log 0.15

pH = 0.82

Finally, we shall determine the pOH of the solution. This can be obtained as follow:

pH = 0.82

pOH =?

pH + pOH = 14

0.82 + pOH = 14

Collect like terms

pOH = 14 – 0.82

pOH = 13.18

Therefore, the pOH of the solution is 13.18

The pOH of the solution is 13.18 when a solution of 0.15 M HCl (aq) is present.

The potential of hydrogen; a measure of the acidity or alkalinity of a solution equal to the common logarithm of the reciprocal of the concentration of hydrogen ions in moles per cubic decimetre of solution.

Concentration of the hydrogen ion, [H⁺] = 0.15 M.

pH =?

pH = – Log[H⁺]

pH = – Log 0.15

pH = 0.82

Finally, we shall determine the pOH of the solution. This can be obtained as follow:

pH = 0.82

pOH =?

pH + pOH = 14

0.82 + pOH = 14

pOH = 14 – 0.82

pOH = 13.18

Therefore, the pOH of the solution is 13.18

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Answer:

2.1 moles of water formed.

Explanation:

Given data:

Moles of water formed = ?

Moles of Ni(OH) = 4.20 mol

Solution:

Chemical equation:

2Ni(OH)    →  Ni₂O + H₂O

Now we will compare the moles of Ni(OH)  with water.

             Ni(OH)           :            H₂O

                2                 :              1

              4.20             :            1/2×4.20 = 2.1 mol

2.1 moles of water formed.

The amorphous block in the block copolymers is the block which doesn't have a fixed pattern. The crystalline block is the block that has a fixed pattern. These characteristics are based on the arrangement of the repeating units.

A block copolymer is a polymer chain made of two or more different types of monomer units that are joined together. There are two distinct types of monomer units in the block copolymers: the amorphous and the crystalline block. The amorphous block is the block that doesn't have a fixed pattern. The repeating units in this block are randomly arranged and can be oriented in any direction. This block doesn't have a specific melting point, and it can deform and flow easily. The crystalline block, on the other hand, has a fixed pattern.

The repeating units in this block are arranged in a regular manner and form a crystalline structure. This block has a specific melting point, and it doesn't deform or flow easily.The characteristics of the repeating units give rise to these properties. The repeating units in the amorphous block are usually flexible and have a low melting point. The repeating units in the crystalline block, on the other hand, are usually rigid and have a high melting point. These properties are based on the arrangement of the repeating units in the block copolymers.

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The balanced equation for the combustion of isooctane to yield CO₂ and H₂O is

2CH₈H₁₈ + 25O₂ → 16CO₂ + 18H₂O

When a substance combines with oxygen gas, it releases energy in the form of heat and light, which is known as a combustion reaction.

When a substance burns in the presence of oxygen, heat and light are produced as a result. This process is referred to as combustion. You may have heard that while some compounds are non-combustible, others are combustible. Simply said, combustible materials go through this procedure.

A lit match is a common illustration of a combustion reaction. A flame is produced when a match is struck because friction heats the head to a temperature where the chemicals react and produce more heat than can be released into the atmosphere.

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Answer:

Basically it would be  8.5g. Not total sure.

Explanation:

If its right plz give brainlest.

Answer:

A. 8.5g

Explanation:

Have a great day!

ΔH° for the reaction Fe3O4(s)+2C (graphite) → 3 Fe(s) + 2CO2(g) is - 725kj/mol⁻¹.

Hess's law states that if a process can be showed as the sum of two or more steps, the enthalpy change for the overall process is the sum of the ΔH values for each step.

Fe3O4(s)+2C (graphite) → 3 Fe(s) + 2CO2(g),    

We invert (1) and change the sign of  ΔH

Fe3O4(s)   →  3Fe(s)+3CO2(g)  ΔH = 1118

We multiply (2) by 3

2C(g)+1/2O2(g) → CO2(g)         ΔH = - -394   (2)

3CO(g)+3/2O2(g)→3CO2(g)         ΔH = 1118

We add (1) and (2)

Fe3O4(s)  →  3Fe(s)+3CO2(g)  ΔH = 824.2 kJ

3CO(g)+3/2O2(g)→3CO2(g)         ΔH = -848.1 kJ

Fe3O4(s)+2C (graphite) → 3 Fe(s) + 2CO2(g),    

Therefore, ΔH° = - 725kj/mol⁻¹

Thus,  ΔH° for the reaction Fe3O4(s)+2C (graphite) → 3 Fe(s) + 2CO2(g) is - 725kj/mol⁻¹.

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Answer:

Line 3 is incorrect

Explanation:

In line 3, the statements should be switched. Chemical reactions involve small amounts of energy and nuclear reactions involve enourmous amounts of energy. Lines 1 and 2 are correct.

VOTE ME FOR BRAINLIEST!!

Answer:

Line 3 is incorrect

Explanation:

i took the test and got it right

Answer:

Si4Br8

Explanation:

The chemical names are formed with prefix and suffix with helps in the formation of chemical formula. Example of prefix are mono- means one, “di-” means two, and “tri-” is three" and suffix are  "ide". Prefix represents the number of elements present in the compound and so help in formation of chemical formula.

The formula for Tetrasilicon octabromide is Si4Br8 as "tetra" used as prefix which represents that there are 4 element of silicon present in the compound and "octa" used as prefix in bromide represents that there are 8 element of bromide present in the compound.

Hence, the correct answer is "Si4Br8".

The equation that represents a single replacement reaction given the various options is 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) (option 2)

A single replacement reaction, also known as single displacement reaction is a reaction in which elements higher in the electro-chemical series displace or replace elements lower in the electro-chemical series displace from a solution.

The following example illustrates single replacement reaction:

A + BC -> AC + B

From the above reaction, we can see that A has replace/displace B to from AC.

With the above information, we can determine the equation that represents single replacement reaction. Details below:

Equation from the questions:

From the above, we can see that only 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) conform to single replacement reaction.

Thus, the correct answer to the question is: 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) (option 2)

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Answer:

133.333333333 cm^3

Explanation:

Volume = Mass/Density

The statements which is true about the reactants from the given simulation above is: It involves the breaking of chemical bonds.

The correct answer choice is option c

For a chemical reaction to occur, the bond between the reacting substances breaks either by covalent or electrovalent bonding in order to form new substance.

So therefore, reactants usually break chemical bonds duringchemical reaction.

Complete question:

A chemical reaction causes the chemical compositions of substances to change. Reactants are substances that enter into a reaction, and products are substances produced by the reaction

Which of the following are the reactants for this simulation? Select all that apply

a. A chemical reaction results to formation of new bonds

b. A chemical reaction involves the formation of new substance.

c. It involves the breaking of chemical bonds

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Answer:  

Explanation:

Claim:   Earth's atmospheric CO2 levels were measured over the past 1000 years and correlated with average world temperatures.  The data demostrate that Earth's temperature did not change during the period CO2 levels were steady.  But the past 100 years show a dramatic rise in CO2 levels, with a corresponding rise in world temperatures.  The CO2 rise can be traced back to the start of the industrial revolution, when machines began doing much of the work.  These machine burn fossil fuels and the increased CO2 levels have led to a dramatic rise in world temperatures.  The data clearly show the importance of reducing fossil fuel useage, as well as other CO2 emitters.  A world of incresing temperatures will lead to greater natural disasters, such as storms, flooding, hurricanes, and drought - all of which upset the ecological balance of the planet.

To reach break point chlorination in a 96,000 gallon pool with a difference of 0.4 ppm between the free chlorine and total chlorine levels, approximately 7.68 ounces of chlorine is needed.

To calculate the amount of chlorine needed to reach break point chlorination in a 96,000 gallon pool, we first need to find the difference between the total chlorine and free chlorine levels. Break point chlorination is achieved when the free chlorine level equals the total chlorine level.

Given that the free chlorine level is 1.4 ppm and the total chlorine level is 1.8 ppm, the difference between them is:

1.8 ppm - 1.4 ppm = 0.4 ppm

Now, we need to determine the amount of chlorine required to raise the free chlorine level by 0.4 ppm in a 10,000 gallon pool. The given information states that it takes 2 ounces of dry chlorine (67% concentration) to raise a 10,000 gallon pool's chlorine level by 1 ppm.

To calculate the amount of chlorine required to raise the free chlorine level by 0.4 ppm in a 10,000 gallon pool, we can set up a proportion:

2 ounces / 1 ppm = X ounces / 0.4 ppm

Solving for X (the amount of chlorine needed for 0.4 ppm increase in a 10,000 gallon pool):

X = (2 ounces / 1 ppm) * 0.4 ppm = 0.8 ounces

Now, we can calculate the amount of chlorine needed for the 96,000 gallon pool by scaling the chlorine required for the 10,000 gallon pool:

Amount of chlorine needed = (0.8 ounces / 10,000 gallons) * 96,000 gallons

Amount of chlorine needed = 0.8 ounces * 9.6 = 7.68 ounces

Therefore, approximately 7.68 ounces of chlorine is needed to reach break point chlorination in the 96,000 gallon pool.

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The temperature of a 0.137 moles of N₂O gas occupying volume of  846mL at a pressure 2.37atm is 178.48K

An ideal gas equation is :

PV =  nRT

Here: P = pressure of a gas (in atm)

         V =volume of a gas(in Litre)

         n = number of moles of a gas

         R = universal gas constant ( 0.082 \(\frac{Latm}{molK\\}\))

         T = temperature of a gas( in kelvin)

calculation:

substitute the given values provided question in the equation.

2.37×0.846 = 0.137×0.082×T

T = 178.48K

Result : The temperature of a given N₂O gas is 178.48K.

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