why is powdered magnesium used in fireworks,
rather than magnesium ribbon?​

Answer:

1. at least two charged interacting parts

2. from the electric fields of charged subatomic particles

3 an arrow released from the bow

4Electrical fields of charged particles interact, bonding those with opposite charges.

5 the interaction of the electric fields of protons and electrons

6 The energy stored in the system increases.

7 Kinetic energy increases because the magnets move in the direction of the field.

8 Iron pieces accelerate toward the magnet, and the energy stored in the system decreases.

9  

The energy stored in the field decreases because the magnet moves in the direction of the field.

10 The energy stored increases and then decreases.

11 The wire was not connected to the source.

12  The electromagnet will become more powerful.

From the electric fields of charged subatomic particles, at least two charged interacting pieces, an arrow launched from the bow, Interaction between electrical fields of charged particles bonds those with opposing charges, the interaction between the protons' and electrons' electric fields.

An electric field is a physical field that surrounds electrically charged particles and acts as an attractor or repellent to all other charged particles in the vicinity. It can also refer to a system of charged particles' physical field.

The area of space surrounding an electrically charged particle or object in which the charge body perceives force is known as the electric field. Examples: -Charges and their arrangements, such as capacitors and battery cells, produce electric fields.

We can produce current flow by applying the pushing force required by electric fields. A circuit's electric field resembles an electron pump in that it is a sizable source of negative charges that can drive electrons.

Thus, From the electric fields of charged subatomic particles, at least two charged interacting pieces.

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Answer:

0.00726mol

Explanation:

Using general gas equation,

PV = nRT

Where;

P = pressure

V = volume

n = number of moles

R = gas constant (0.0821 L atm mol/K)

T = temperature

First, we need to convert the units of each variable

Volume = 185mL = 0.185L

Pressure = 760.0 torr = 1 atm

Temperature = 98.6°F = 310.15K

PV = nRT

1 × 0.185 = n × 0.0821 × 310.15

0.185 = 25.46n

n = 0.185/25.46

n = 0.00726mol

The mass of oxygen gas required to produce 15.0 L of dinitrogen trioxide is 51.1 g.

To solve this problem, we first need to write a balanced chemical equation for the reaction. Dinitrogen trioxide is formed from the reaction of nitrogen dioxide and dinitrogen oxide:

2 NO2(g) + N2O4(g) -> 3 N2O3(g)

This equation tells us that 3 moles of dinitrogen trioxide are produced for every 2 moles of nitrogen dioxide and 1 mole of dinitrogen oxide. The first step in solving the problem is to use the ideal gas law to find the number of moles of dinitrogen trioxide produced. Assuming standard temperature and pressure (STP), which is 0 degrees Celsius and 1 atm, 15.0 L of dinitrogen trioxide represents 0.536 moles. Since the ratio of dinitrogen trioxide to nitrogen dioxide is 3:2, we can calculate the number of moles of nitrogen dioxide produced to be 0.357 moles. Using the molar mass of nitrogen dioxide (46.0055 g/mol), we find that the mass of nitrogen dioxide produced is 16.4 g. Finally, we use the balanced chemical equation to determine the amount of oxygen gas required, which is 51.1 g.

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The correct order of the increasing polarity of the analyte functional group isEthers < Esters.

The given statement is "Polarities of analyte functional group increase in the order of hydrocarbon ethers < esters."  The order of polarities of functional groups is the order of their increasing polarity (i.e., less polar to more polar) based on their electron-donating or withdrawing ability from the rest of the molecule.Polarity of analyte: The analyte's polarity is directly proportional to the dipole moment of the functional group, which is associated with a difference in electronegativity between the atoms that make up the functional group.The electronegativity of an element is its ability to attract electrons towards itself. The greater the difference in electronegativity between two atoms, the more polar their bond, and hence the greater the polarity of the molecule.

To find the correct order of the increasing polarity of the analyte functional group, let's first compare the two groups: hydrocarbon ethers and esters. Here, esters have a carbonyl group while ethers have an oxygen atom with two alkyl or aryl groups. The carbonyl group has more electronegative oxygen, which pulls electrons away from the carbon atom, resulting in a polar molecule. On the other hand, ethers have a less polar oxygen atom with two alkyl or aryl groups, making them less polar than esters. Therefore, the correct order of the increasing polarity of the analyte functional group isEthers < Esters.

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The correct option that completes the statement is:

c. natural selection affects survival.

The given information about increased emissions of CO₂ leading to an increase in ocean acidification and its consequences on marine organisms indicates the influence of natural selection. Natural selection is the process by which individuals with advantageous traits that enhance their survival and reproductive success are more likely to pass on their genes to the next generation.

In the context of ocean acidification and the disruption of shell formation in marine organisms, those individuals or species with adaptations or genetic variations that allow them to cope with the changing conditions may have a higher chance of survival compared to those without such traits. Over time, this can lead to changes in the composition of marine species populations, with those more resilient to acidification being favored through natural selection.

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The modern periodic law states that the physical and chemical properties of the elements are periodic functions of their atomic numbers. The elements are arranged in the increasing order of their atomic numbers.

Here the element Lithium is a alkali metal which is located in the group 1 of the periodic table and placed in the second period. Its atomic number is 3. Alkali metals are highly electropositive and are good reducing agents.

Lithium reacts with the elements of groups 16 and 17 and form compounds, they also burn in oxygen and react with water.

The reaction of lithium with water is:

2Li + 2H₂O → 2LiOH + H₂

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An element with properties halfway between those of metals and nonmetals is said to be a metalloid. Semimetals are another name for metaloids.

A metalloid is an element that is difficult to categorize as either a metal or a nonmetal because it has a majority of qualities that fall between those of metals and nonmetals or that are a combination of both.

Except for hydrogen, which is a nonmetal, the elements are arranged in a triangle with the metals to the left, the nonmetals to the right, and the metalloids to the immediate right of the triangle.

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A chemical reaction in a battery causes a flow of electrons from the negative terminal to the positive terminal ---- False, Electrons move from the positive to negative terminals within the battery.

2 . The chemical reaction in a battery reverses when a battery is being charged and keeps reversing until the battery returns to its original fully charged state ---- True.

Electrons stream from the adverse terminal to the positive. Positive charge carriers are assumed to be the source of conventional current, or simply current. The positive terminal receives conventional current from the negative terminal.

A flow of charges is electric current. We are aware that a cell's positive and negative terminals both receive current. The direction in which electrons flow is in opposition to the direction in which current flows. As a result, electrons move from a cell's negative terminal to its positive terminal in a closed circuit.

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Complete question as follows :

A chemical reaction in a battery causes a flow of electrons from the negative terminal to the positive terminal. True False

Question 46 (1 point) The chemical reaction in a battery reverses when a battery is being charged and keeps reversing until the battery returns to its original fully charged state True False

Answer:

active ions

Explanation:

active ions (d)

The question that is relevant to the student's concerns about the security of sharing digital information online is C, "What is the password policy for the service?"

Knowing the password policy for the cloud storage service is important because it can affect the level of security for the student's photos. A strong password policy can help prevent unauthorized access to the stored photos. In addition, the student should consider whether the service offers two-factor authentication or encryption of stored data, as these features can further enhance security.

While the monthly cost, storage limit, and upload speed are important factors to consider, they are not directly related to the security of the stored photos.

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The standard enthalpy change for reaction (3) is 117.1 kJ.

The standard enthalpy change for reaction (3) can be calculated by using the enthalpy changes of reactions (1) and (2) and applying Hess's Law.

To do this, we need to manipulate the given equations so that the desired reaction (3) can be obtained.

First, we reverse reaction (1) to get the formation of C2H4(g) from C2H6(g):

C2H4(g)C2H6(g) ΔH° = -52.3 kJ

Next, we multiply reaction (2) by 2 and reverse it to obtain 2 moles of C2H6(g) reacting to form 3 moles of H2(g):

2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

Now, we add the two modified equations together:

C2H4(g)C2H6(g) ΔH° = -52.3 kJ
2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

When adding these equations, the C2H6(g) on the left side cancels out with the C2H6(g) on the right side, leaving us with the desired reaction (3):

C2H4(g) + H2(g)C2H6(g) ΔH° = -52.3 kJ + 169.4 kJ = 117.1 kJ

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Answer:

Rate cup 1: 36.00 tsp/h.

Rate cup 2: 59.50 tsp/h.

Rate cup 3: 70.13 tsp/h.

Explanation:

Based on the given example, the units must be in tsp/hour. To do this we just have to divide tsp by seconds and then convert it to hours remembering that 1 hour equals 3600 seconds.

Let's calculate each case:

- Cup 1: 1 tsp, 1 minute 40 seconds. Remember that 1 minute equals 60 seconds, so 1 minute and 40 seconds equals 100 seconds. The calculation of the rate will look like this:

The rate of cup 1 is 36.00 tsp/h.

- Cup 2: 2 tsp, 2 minutes 1 second. As we saw before 1 minute equals 60 seconds, so 2 minutes equals 120 seconds. 2 minutes and 1 second equals 121 seconds. The rate of cup 2 will be calculated as:

The rate of cup 2 is 59.50 tsp/h.

- Cup 3: 3 tsp, 2 minutes 34 seconds. 2 minutes are the same that 120 seconds, so 2 minutes 34 seconds equals 154 seconds. The rate of cup 3 is calculated as follows:

The rate of cup 3 is 70.13 tsp/h.

Answer:

.52 M

Explanation:

moles ÷ liters = molarity

2.45 ÷ 4.75 = 0.5157894737

rounding it = .52

Answer:

known as reactions and metaphorically breaking the witness into telling the truth. I hope this helped:)

Explanation:

Answer:

the right answer is b !!!

Answer:

Li2SO4+H2CO3

Explanation:

put d equation this way

negative ions to positive ions

Explanation:

H2O:

2 H2O shows 2 atoms of hydrogen. The number 2 in front of it means 2 moles of H2O

----------

CHA:

It only shows 1 atom of hydrogen

1 CHA means 1 mole of CHA

2 CHA means 2 moles of CHA

----------

HO2:

It only shows 1 atom of hydrogen

---------

H2SO4:

It shows 2 atoms of hydrogen

Answer:

H2O

H2SO4

Casting pewter involves tremendous temperatures, which makes it potentially highly dangerous.  Wearing safety gear like the kind pictured below is required, and taking all reasonable safety precautions is crucial.

Gases or scents that are toxic or offensive may be released during burning or thermal breakdown. Unusual Explosion and Fire Risks: When molten, water reacts violently with it.

Despite significant variations, 96% tin and 4% copper make up the majority of modern pewter. It is a soft metal, allowing for simple shaping with both hand and machine tools. A low melting point makes it suitable for casting (230 degrees, roughly).

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Based on the given information, it is possible that the mineral with the weaker reaction is a feldspar mineral, specifically an orthoclase or plagioclase feldspar.

The weaker reaction of a mineral with dilute hydrochloric acid (HCl) suggests that the mineral is likely composed of a mineral group that is less susceptible to acid dissolution. One such mineral group is the feldspar group.

Feldspar minerals, such as orthoclase and plagioclase, are commonly found in light-colored rocks and have a moderate to weak reaction with dilute HCl. They typically show a faint effervescence or no reaction at all when HCl is applied.

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To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Therefore, the atom that make up substances give each state its characteristic property.

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.

In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron. The atom that make up substances give each state its characteristic property.

Therefore, the atom that make up substances give each state its characteristic property.

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If 6.97 g of solid calcium metal reacts with 6.97 g of nitrogen gas in a combination reaction. The grams of calcium nitride formed is 0.0579 mol x 148.25 g/mol = 8.59 g.

To find the limiting reactant, the molar masses of calcium and nitrogen are needed. The molar mass of calcium is 40.08 g/mol, and the molar mass of nitrogen is 28.02 g/mol.

Next, the number of moles of each reactant is calculated by dividing the given masses by their respective molar masses. For calcium, 6.97 g / 40.08 g/mol = 0.1738 mol, and for nitrogen, 6.97 g / 28.02 g/mol = 0.2487 mol.

To determine the limiting reactant, the molar ratio between calcium and nitrogen in the balanced chemical equation is examined. The balanced equation for the reaction is:

3Ca + N2 -> Ca3N2

The ratio is 3:1, meaning that 3 moles of calcium react with 1 mole of nitrogen to form 1 mole of calcium nitride.

Comparing the calculated moles, it is evident that the number of moles of calcium is smaller than the number of moles of nitrogen. This indicates that calcium is the limiting reactant.

Using stoichiometry, the number of moles of calcium nitride formed can be calculated based on the limiting reactant. Since the molar ratio is 3:1 between calcium and calcium nitride, the moles of calcium nitride formed is 0.1738 mol x (1 mol Ca3N2 / 3 mol Ca) = 0.0579 mol.

Finally, the grams of calcium nitride formed can be determined by multiplying the moles of calcium nitride by its molar mass. The molar mass of calcium nitride (Ca3N2) is calculated as 148.25 g/mol (the sum of the atomic masses of calcium and nitrogen). Thus, the grams of calcium nitride formed is 0.0579 mol x 148.25 g/mol = 8.59 g.

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The VSEPR theory geometry for XeF5- would be square pyramidal, with a bond angle of 90 degrees. The molecule is polar due to the asymmetrical distribution of the XeF5- molecule.

To draw the Lewis structure for each molecule, we need to first count the total number of valence electrons in each atom. Chlorine (Cl) has 7 valence electrons and Fluorine (F) has 7 valence electrons, and Xenon (Xe) has 8 valence electrons.
For the molecule ClF3, we have a total of 28 valence electrons. The Lewis structure would look like:

                   Cl
                  /  \
                F    F
                 \   /
                   Cl

The VSEPR theory geometry for ClF3 would be trigonal bipyramidal, with a bond angle of 120 degrees. The molecule is polar due to the asymmetrical distribution of the ClF3 molecule, which results in a dipole moment.
For the ClF4- molecule, we would add an extra electron to the total valence electrons to account for the negative charge, giving us a total of 32 valence electrons. The Lewis structure would look like:

                    Cl
                   / \
                 F   F
                |     |
                 F   F
                   \ /
                    Cl-

The VSEPR theory geometry for ClF4- would be square planar, with a bond angle of 90 degrees. The molecule is nonpolar due to the symmetrical distribution of the ClF4- molecule.
For the ClF2 molecule, we have a total of 20 valence electrons. The Lewis structure would look like:

                   Cl
                   |
                 F    F

The VSEPR theory geometry for ClF2 would be linear, with a bond angle of 180 degrees. The molecule is polar due to the asymmetrical distribution of the ClF2 molecule.
For the XeF5- molecule, we would add an extra electron to the total valence electrons to account for the negative charge, giving us a total of 42 valence electrons. The Lewis structure would look like:

                     F
                    / \
               F - Xe - F
                    \ /
                     F
                      -

The VSEPR theory geometry for XeF5- would be square pyramidal, with a bond angle of 90 degrees. The molecule is polar due to the asymmetrical distribution of the XeF5- molecule.

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Answer:

B. Atmospheric Pressure and Visibility

Explanation:

Latitude and Longitude are locations, not aspects of weather.

While dew point is an element, ground temperature is not measured.

Condensation regarding clouds might be measured but saturation more or less isn't. (Unless specifically humidity.

Atmospheric Pressure and Visibility are both elements of weather.

Then the solution is supersaturated.

As per the question, if NaCl is soluble in water to the extent 36.0 g NaCl/100 g H2O at 20 °C, then a solution at 20°C containing 45 g NaCl/160 g H2O would be:

Supersaturated at 20°C

Explanation:

A solution is considered to be supersaturated if it contains more solute than what can dissolve in it at a particular temperature. It is, therefore, an unstable solution, and if any disturbance is provided, the excess solute starts to form crystals or precipitate. Thus, such a solution is capable of further dissolving the solute.

Suppose a solution of NaCl is considered, which is soluble in water to the extent of 36.0 g NaCl/100 g H2O at 20°C. This information helps in determining the solubility of NaCl at 20°C, which is 36.0 g NaCl/100 g H2O.Now, consider another solution that contains 45 g NaCl/160 g H2O at 20°C.

For determining whether the solution is saturated, unsaturated or supersaturated, compare the solubility of NaCl at 20°C to the given concentration of NaCl in the solution.The solubility of NaCl is 36.0 g NaCl/100 g H2O at 20°C, whereas the given concentration of NaCl in the solution is 45 g NaCl/160 g H2O. This concentration is higher than the solubility of NaCl.

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Using the periodic table the number of electrons is determined as;

Fluorine (F) has 5 electrons in 2p orbital.

Silicon (Si) has 2 electrons in 3p orbital.

Iron (Fe) has 6 electrons in 3d orbital.

Krypton (Kr) has 6 electrons in 4p orbital.

The number of electrons in each orbital or the electronic configuration can be determined by the Aufbau principle, along with other principles such as the Pauli exclusion principle and Hund's rule.

1. The atomic number of Fluorine is 9, which means it has 9 electrons. In the ground state, 2 electrons are in the 1s orbital, 2 electrons are in the 2s orbital, and 5 electrons are in the 2p orbital. Therefore, the number of 2p electrons in F is 5.

2. The atomic number of Silicon is 14, which means it has 14 electrons. In the ground state, 2 electrons are in the 1s orbital, 2 electrons are in the 2s orbital, 6 electrons are in the 2p orbital, and 2 electrons are in the 3s orbital. Therefore, the number of 3p electrons in Si is 2.

3. The atomic number of Iron is 26, which means it has 26 electrons. In the ground state, 2 electrons are in the 1s orbital, 2 electrons are in the 2s orbital, 6 electrons are in the 2p orbital, 2 electrons are in the 3s orbital, and 6 electrons are in the 3p orbital. Therefore, the number of 3d electrons in Fe is 6.

4. The atomic number of Krypton is 36, which means it has 36 electrons. In the ground state, 2 electrons are in the 1s orbital, 2 electrons are in the 2s orbital, 6 electrons are in the 2p orbital, 2 electrons are in the 3s orbital, 6 electrons are in the 3p orbital, 10 electrons are in the 3d orbital, and 2 electrons are in the 4s orbital. Therefore, the number of 4p electrons in Kr is 6.

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Answer:

So that we know how many electrons are thre in which shell and how many shells are present in an atom....

Explanation:

Hope it helps!!!

1. The new volume of the gas will be 58 L

2. The new volume will be 105.65 mL

3. The new temperature will be -15.49 °C

4. The final pressure will be 28.48 KPa

The new volume of the gas can be obtained by using Charles' law equation as follow:

V₁ / T₁ = V₂ / T₂

24 / 265 = V₂ / 642

Cross multiply

265 × V₂ = 24 × 642

Divide both side by 265

V₂ = (24 × 642) / 265

New volume (V₂) = 58 L

The following data were obtained from the question

The new volume can be obtained by using the combined gas equation as follow:

P₁V₁ / T₁ = P₂V₂ / T₂

(0.5 × 250) / 323 = (1 × V₂) / 273

Cross multiply

323 × V₂ = 0.5 × 250 × 273

Divide both side by 323

V₂ = (0.5 × 250 × 273) / 323

New volume = 105.65 mL

The new temperature can be obtained by using the combined gas equation as follow:

P₁V₁ / T₁ = P₂V₂ / T₂

(450 × 2.52) / 310 = (600 × 1.57) / T₂

Cross multiply

450 × 2.52 × T₂ = 310 × 600 × 1.57

Divide both side by (450 × 2.52)

T₂ = (310 × 600 × 1.57) / (450 × 2.52)

T₂ = 257.51 K

Subtract 273 to obtain answer in °C

T₂ = 257.51 - 273 K

New temperature = -15.49 °C

The combined gas equation is given as follow:

P₁V₁ / T₁ = P₂V₂ / T₂

Inputting the given parameters, we obtained:

(47.81 × 0.45) / 298 = (P₂ × 0.825) / 325.5

Cross multiply

298 × 0.825 × P₂ = 47.81 × 0.45 × 325.5

Divide both sides by (345 × 150)

P₂ = (47.81 × 0.45 × 325.5) / (298 × 0.825)

Final pressure = 28.48 KPa

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