3.
What do we call materials
that let heat pass through
them easily?
Thermal conductors
Thermal insulators
Transparent

4.
Which of these is a good
thermal conductor?
Plastic
Wood
Steel

5.
Which of these is a good
thermal insulator?
Steel
Iron
Polystyrene

6.
To save on heating bills, do
you think the roof of a
building should be lined with...
a thermal conductor
a thermal insulator
nothing

7.
How does heat travel?
From cold things to hotter things
From hot things to colder things
Between things of the same temperature

The question provides a list of chemical formulas and their respective names and requests us to show the "rought work" - the calculations of the oxidation states for each element in the molecule.

To calculate the charge of the elements in a molecule, we need to keep in mind that some species have a determined number of oxidation that only changes in very specific occasions, such as oxygen (O2-) and hydrogen (H+1). Also, it is important to remember that the charge of the entire molecule must be considered - in this case, all molecules are neutral (total charge = 0). At last, we always need to consider the number of atoms of each element in the molecule to calculate the total charge and, if needed, multiply the number of atoms by the charge of the atom.

For copper (II) nitrite, CuN2O4, we can start with the charge of Cu, given in the name of the molecule (+2) and O (-2) and then calculate the required nox of N:

Cu: 1 * +2 = +2

O: 4 * -2 = -8

To achieve total charge = 0, the atoms of N need to balance +2-8=-6

Thus, the charge of each atom of N should be +6/2 = +3

N: 2 * +3 = +6

(total charge = +2 -8 +6 = 0)

For NH4Cl, we start from Cl (-1) and H (+1) and then calculate the charge of N:

Cl: 1 * -1 = -1

H: 4 * +1 = +4

To achieve total charge = 0, the atoms of N must balance +4 - 1 = +3

Thus, we calculate the charge of each atom of N: +3/1 = +3

N: 1 * +3 = +3

For AuI3, the name of the compund states that gold has +3 charge (Au III). We could also start from I, which has charge -1:

I: 3 * -1 = -3

Au: 1 * +3 = +3

For NiF2, the name also says that Ni has a charge (+2), but we could also calculate it from the charge of F, which is -1:

F: 2 * -1 = -2

Ni: 1 * +2 = +2

For Nb2(PO4)5, we can start from O (-2) and Nb (+5, as said in the compound's name). Note that, for this molecule, we also need to consider the number outside the parenthesis!

O: 4*5 * -2 = -40

Nb: 2 * +5 = +10

To achieve total charge = 0, the atoms of P must balance -40+10=-30

Thus, we calculate the charge of each atom of P, knowing that there are 5 of them: +30/5 = +6

P: 5 * +6 = +30

(total charge = -40 + 10 +30 = 0)

For N2Br4, we can start from Br, which has charge -1:

Br: 4 * -1 = -4

N: 2 * +2 = +4

To achieve total charge = 0, we need that the charge of all atoms of N be equal to +4.

Thus: charge of N: +4/2 = +2

The molecules that are polar among the given options are as follows:

NBr₃

CH₃Cl

Polar molecules are formed when one end of the molecule is said to possess more positive charges and whereas the opposite end of the molecule has negative charges, creating an electrical pole.

In polar molecules, the distribution of electrons between the covalently bonded atoms is not even.

The N–Br bond in NBr₃ is polar because the electrons that are shared between the two atoms are concentrated in the Br atom.

CH₃Cl is polar because the C-Cl bond is polar, the CH₃Cl has a net dipole, so CH₃Cl is polar.

PCl₅, CH₄, N₂ are said to be non polar because, as a bond is formed between the two atoms, there is no difference in their electronegativity and the net dipole moment becomes zero.

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When answering questions on the Brainly platform, it is important to always be factually accurate, professional, and friendly. It is also important to be concise and avoid providing extraneous amounts of detail. Typos or irrelevant parts of the question should be ignored.

In this experiment, the student will examine how atoms absorb and emit photons which are particles of light. If an atom emits a photon, this leads to a negative change in the atom's energy. The sign for this change in energy is negative, making this process exothermic.

Exothermic processes release energy into the environment, usually in the form of heat or light. When an atom emits a photon, it is releasing energy in the form of light. This means that the energy of the atom is decreasing, and the process is exothermic.

In contrast, endothermic processes absorb energy from the environment. These processes require energy to occur, and their sign for change in energy is positive. In the context of this experiment, if an atom were to absorb a photon, its energy would increase, and the process would be endothermic.

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Answer:

A. Find a connection between variables

Explanation:

In the scientific method, the first step is to make an observation. To observe means to carefully monitor phenomena with a view to draw general patterns from specific occurrences.

The second step is to draw up a hypothesis; this is a tentative explanation for the observation.

The next step is to perform an experiment to determine the effect of change in one more variables on another variable. The experiment will confirm or disprove the hypothesis.

The last step is to draw a conclusion. In drawing up a conclusion, a scientist finally establishes the relationship between two variables and finds the connection between them.

6.02 x \(10^{20\) formula units of MgCl₂ is equal to 0.1 moles of MgCl₂.

To convert formula units of MgCl₂ to moles of MgCl₂, we need to use Avogadro's number, which relates the number of formula units to the number of moles.

Avogadro's number (NA) is approximately 6.022 x 10^23 formula units per mole.

Given that we have 6.02 x 10^20 formula units of MgCl₂, we can set up a conversion factor to convert to moles:

(6.02 x 10^20 formula units MgCl₂) * (1 mol MgCl₂ / (6.022 x 10^23 formula units MgCl₂))

The formula units of MgCl₂ cancel out, and we are left with moles of MgCl₂:

(6.02 x 10^20) * (1 mol / 6.022 x 10^23) = 0.1 mol

Therefore, 6.02 x 10^20 formula units of MgCl₂ is equal to 0.1 moles of MgCl₂.

It's important to note that this conversion assumes that each formula unit of MgCl₂ represents one mole of MgCl₂. This is based on the stoichiometry of the compound, where there is one mole of MgCl₂ for every one formula unit.

Additionally, this conversion is valid for any substance, not just MgCl₂, as long as you know the value of Avogadro's number and the number of formula units or particles you have.

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Answer:

The intermolecular forces increase in the following order:

C2H6 < CH4 < CH3F < NH3

The reasoning behind this order is as follows:

C2H6 (ethane) is a nonpolar molecule with only dispersion forces, which are the weakest intermolecular forces.

CH4 (methane) is also nonpolar and only has dispersion forces, but it has a slightly larger molecular weight than ethane, which leads to stronger dispersion forces.

CH3F (fluoromethane) is polar and has dipole-dipole forces in addition to dispersion forces. The dipole-dipole forces are stronger than the dispersion forces in this case.

NH3 (ammonia) is also polar and has hydrogen bonding, which is a stronger type of dipole-dipole force.

Explanation:

Types of luminous flames:

1. Yellow Luminous Flame

2. Smoky Luminous Flame

3. Orange Luminous Flame

4. Blue Luminous Flame

Luminous flames are characterized by their visible glow, which is caused by the incomplete combustion of fuel. The presence of soot particles in the flame causes the emission of light. There are different types of luminous flames, which can be classified based on their fuel composition and burning conditions. Here are some common types of luminous flames:

1. Yellow Luminous Flame: This is the most common type of luminous flame, often seen in open fires, candles, and gas stoves. It appears yellow due to the presence of soot particles in the flame. Yellow flames indicate incomplete combustion of hydrocarbon fuels, such as methane, propane, or natural gas. The high carbon content in these fuels leads to the formation of soot, which emits visible light.

2. Smoky Luminous Flame: This type of flame is characterized by a significant amount of black smoke and soot production. It is commonly observed in poorly adjusted or malfunctioning burners or engines. The excessive presence of unburned fuel in the flame results in incomplete combustion and the emission of dark smoke particles.

3. Orange Luminous Flame: An orange flame indicates a higher combustion temperature compared to a yellow flame. It is often seen in more efficient burners or when burning fuels with a higher carbon content, such as oil or diesel. The higher temperature helps in burning more of the carbon particles, reducing the amount of soot and making the flame appear less yellow.

4. Blue Luminous Flame: A blue flame is typically associated with complete combustion. It indicates efficient burning of fuel, resulting in minimal soot formation. Blue flames are commonly observed in gas burners or Bunsen burners. The blue color is a result of the combustion of gases, such as methane, in the presence of sufficient oxygen.

It's important to note that the luminosity of a flame can vary depending on factors such as fuel-air mixture, combustion temperature, and the presence of impurities. Achieving complete combustion and minimizing the production of soot is desirable for efficient and cleaner burning processes.

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Answer:

gas

Explanation:

gas: indefinite shape, indefinite volume. Indefinite shape means that the sample in question takes on the shape of the container.

The energy of the photons are;

infrared radiation - 8.3* 10^4 J  

visible light - 2.52 * 10^5 J

ultraviolet radiation - 7.72 * 10^5 J

The energy of photon could be found by the use of the of the equation;

E = hc/λ * 6.023 * 10^23/1 mole

E = energy of the photon

c = speed of light

λ = wavelength of the photon

Now;

For infrared radiation;

E = 6.6 * 10^-34 * 3 * 10^8/1580 * 10^-9 * 6.023 * 10^23/1 mole * 1.10 mol

E = 8.3* 10^4 J  

For visible light;

E = 6.6 * 10^-34 * 3 * 10^8/520 * 10^-9 * 6.023 * 10^23/1 mole * 1.10 mol

E = 2.52 * 10^5 J

For ultraviolet radiation;

E = 6.6 * 10^-34 * 3 * 10^8/170 * 10^-9 * 6.023 * 10^23/1 mole * 1.10 mol

E= 7.72 * 10^5 J

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Answer:

iron and chlorine

Explanation:

Answer:

\(K=1.7x10^{-3}\)

Explanation:

Hello there!

In this case, according to the given information, it turns out possible for us to solve this problem by firstly setting up the equilibrium expression for the given reaction, in agreement to the law of mass action:

\(K=\frac{[NO]^2}{[N_2][O_2]}\)

Next, we plug in the given concentrations on the data table to obtain:

\(K=\frac{(0.034)^2}{(0.69)(0.98)}\\\\K=1.7x10^{-3}\)

Regards!

Answer:

I would serve nothing

Explanation:

thank you bye\

Answer:

Explanation:

I would not serve it because what if Their is some dangerous chemical

Answer:

Acidic.

Explanation:

Hello,

In this case, we can know whether the solution is basic, acidic or neutral by computing the pH given the concentration of hydronium as shown below:

\(pH=-log([H^+])=-log(3.2x10^{-4})\\\\pH=3.49\)

Therefore, since the pH is lower than 7, we sum up the solution is acidic.

Best regards.

Answer:Yes

Explanation:

Because Chinstrap penguins eat krills

Answer:

You would see whatever liquid you added slowly disappearing

Explanation:

Hope this helps:)........if not then sorry for wasting your time and may God bless you:)

Answer:

If you take a clear cup of water and put a camera to watch it, If you time lapsed it, you would see the water slowly evaporate.

Explanation:

Hope this helped :)

Answer:

Its b

Explanation:

The amount of \(HClO_3\) that will be produced from 10 liters of \(ClO_2\) would be 8.33 liters.

  \(HClO_3\) is produced from the reaction of  \(ClO_2\) and \(H_2O\) according to the following equation:

\(6 ClO_2 + 3 H_2O --- > 5 HClO_3 + HCl\)

From the balanced equation of the reaction, 6 moles of \(ClO_2\) reacts to produce 5 moles of \(HClO_3\). Thus the mole ratio is 6:5.

Now, assuming the mole ratio also transcribes to the volume ratio and 10 liters of \(ClO_2\) is available for reaction. The amount of \(HClO_3\) that will be produced can be calculated from the volume ratio as follows:

6 moles  \(ClO_2\) = 5 moles  \(HClO_3\)

10 liters  \(ClO_2\) = 5 x 10/6

                       = 8.33 liters

In other words, with 10 liters of \(ClO_2\), the volume of \(HClO_3\) that will be produced would be 8.33 liters.

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Answer:

C. Plate tectonic collisions can create mountains.

Answer:

They can make them larger

Explanation:

They go up under a mountain and then the mountains rise up

Krypton, Chromium, and Oxygen with the following symbols Kr-13, Cr-2, and O-15 respectively have 23 electrons.

The atomic number of an atom determines the number of electrons it has. When the number of protons is equivalent to the number of electrons, the atom is electrically neutral. An anion, on the other hand, is an atom with a negative charge. It has gained an electron or two, or even more. Below are the chemical symbols for three different atoms or atomic anions with 23 electrons.Krypton:Kr has an atomic number of 36, indicating that it has 36 electrons. However, if we add 13 electrons to it, the total number of electrons becomes 49. Krypton with 13 additional electrons becomes Kr-13, with a total of 49 electrons.Chromium:Cr has an atomic number of 24, indicating that it has 24 electrons. Adding two more electrons to it, the total number of electrons becomes 26. The atomic anion with 26 electrons is Cr-2.Oxygen:Oxygen has an atomic number of 8, indicating that it has 8 electrons. However, if we add 15 electrons to it, the total number of electrons becomes 23. Oxygen with 15 additional electrons becomes O-15, with a total of 23 electrons.

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Sodium carbonate, often referred to as Na2CO3, is a chemical compound composed of atoms of sodium (Na), carbon (C) and oxygen (O).

It is also sometimes called washing soda or soda ash. At room temperature, sodium carbonate is a white, crystalline solid that is very soluble in water. According to the chemical formula of the sodium carbonate molecule, Na2CO3, each molecule consists of two sodium atoms (Na), one carbon atom (C) and three oxygen atoms (O). The atomic configuration in sodium carbonate is shown in the given diagram.

A trigonal planar arrangement is formed when the central carbon atom is bonded to three oxygen atoms. The structure of sodium carbonate is completed by two sodium atoms joined to oxygen atoms.

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Answer:

c

Explanation:

boulder was at rest on top of a hill so it contains abundant potentialenergy. When the boulder falls, its potential energy will change to kinetic energy, the energy of motion. When the boulder stops moving, its kinetic energy will transform back to potential energy

Answer:

0.006342moles

Explanation:

1000ml of NaOH contain 0.151moles

42ml of NaOH contain (42*0.151)/1000 moles

=0.006342moles

Answer:

The balanced molecular equation for the reaction is:

\(2HNO_{3_{(aq)} }\) + \(K_{2} CO_{3} _{(s)}\) → \(2KNO_{3} _{(s)}\) + \(H_{2} O_{(l)\) + \(CO_{2} _{(g)}\)↑

Explanation:

The weak nitric acid reacts with the strong potassium base to produce salt, water and carbon dioxide which is given off.

Molecular ratio of reactants is 2 : 1.

All phases are represented in the equation: aq for aqueous, l for liquid and g for gas (notice how they are written in subscript).

I hope this was helpful.

Answer:

12.1 grams and 77.8%

Explanation:

(Note: in this answer, sig figs are rounded in the end, not along the way) The molar ratio of calcium sulfate to calcium hydroxide is 1:1
there are 6.56 grams of calcium hydroxide, so the number of moles is the number of grams / the molar mass, which is (6.56 grams) / (74.093 g/mole)
=0.08854 moles of calcium hydroxide
Theoretically, 0.08854 moles of calcium hydroxide would make 0.08854 moles of calcium sulfate.
To find the number of grams of calcium sulfate, multiply the number of moles by the molar mass, which is .08854 * 136.14 = 12.054 grams, or
12.05 grams
The percentage yield of calcium sulfate is just the actual yield / predicted yield, which is 9.37/12.05 which is 0.7776, or 77.8%

When you put it into a table and separate the variables, you'll get 0.80 molecules.

Answer: KCl

That is the correct answer on pearson

Answer:

985.2 moles of nitrogen can produce 1970.4 moles of ammonia.

Explanation:

The balanced chemical equation for the production of ammonia from nitrogen is:

N2 + 3H2 → 2NH3

From the balanced equation, we can see that 1 mole of nitrogen reacts with 3 moles of hydrogen to produce 2 moles of ammonia.

So, to determine how many moles of ammonia can be produced from 985.2 moles of nitrogen, we need to use the mole ratio from the balanced chemical equation as follows:

985.2 moles N2 x (2 moles NH3 / 1 mole N2) = 1970.4 moles NH3

Therefore, 985.2 moles of nitrogen can produce 1970.4 moles of ammonia.

Answer: 6

Explanation:

You would need 6

Answer:

migratory distribution

Explanation: The pattern of migratory distribution of species may require collaboration between different countries for effective preservation. This is because species migration can make them enter different territories, which will need to provide an effective level of preservation for species survival