Catalytic converters reduce the engine's tailpipe emissions of unburned hydrocarbons and carbon monoxide and can be recycled. a) trueb) false

Relationship between resistance and current in a circuit is current is inversely proportional to the resistance

The relationship between current and voltage, resistance is expressed by ohm's law and this states that the current flowing in a circuit is directly proportional to the applied voltage and inversely proportional to the resistance of the circuit and provided the temprature remain constant and hence the relationship between current and resistance could be written as I = VR for constant value of voltage and the current is inversely proportional to the resistance

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The empirical formula of the magnesium oxide formed is MgO

Here given data is piece of magnesium with a mass = 5.867 g  after the magnesium had combusted and allowed to cool down the product and mass = 8.956 g

The empirical formula is the simplest whole number ratio of atoms in a compound and the ratio of atoms is the same as the ratio of moles and when crucible react with magnesium and air means oxygen then magnesium reacts readily with oxygen in the air, to produce magnesium oxide then chemical reaction is written as follows:

2Mg + O₂ → 2MgO

and hence when it cool down automatically the mass of magnesium is more than 1st mass because in that oxygen of air are added and that's why MgO are made the empirical formula of the magnesium oxide formed is MgO

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The reaction between aqueous calcium chloride and aqueous lead(II) nitrate, which results in the formation of aqueous calcium nitrate and solid lead(II) chloride, has the following balanced net ionic equation: PbCl2(s) + Ca(NO3)2 Pb(NO3)2(aq) + CaCl2(aq) (aq).

A chemical equation known as a balanced net ionic equation only displays the species and ions that are actively participating in a reaction, leaving out any spectator ions. The spectator ions that appear on both the reactant and product sides of the chemical equation are cancelled out to produce the net ionic equation. To highlight the primary chemical process taking place and to make the equation simpler to understand and evaluate, a balanced net ionic equation is used. This can be very helpful when figuring out how a response works and forecasting how it will turn out.

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Answer:

In the oxide form, uranium can be disposed of as low-level radioactive waste at an approved disposal facility. Approximately 350,000 tons of anhydrous HF are used annually in the United States.

Explanation:

Answer:

The answer is 1:1

Explanation:

A lizard basking in the morning sun is an example of behavior known as thermoregulation. Thermoregulation is a behavior that allows animals to control their body temperature by adjusting to the surrounding environment.

A lizard basking in the morning sun is an example of this behavior, as it is a common way for reptiles to regulate their temperature. By absorbing heat from the sun, the lizard can increase its body temperature to an optimal level that is necessary for its metabolic processes to function properly. This helps the lizard maintain its energy levels and overall health, and is crucial for survival in a changing and unpredictable environment. Thermoregulation is an important adaptation that has evolved in many species to help them cope with variations in temperature, and is essential for their survival.

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Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L} \\\)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

We have

\(n = \frac{1.00 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{1}{6.02} \\ = 0.166112\)

We have the final answer as

Hope this helps you

Explanation:

(i) Two observations made in the experiment are:-

(a) Temperature is raised due to the vigorous reaction.

(b) It is an exothermic reaction, heat is observed.

(ii)

quicklime

CaO

(s)+

water

H

2

O

(l)⟶

CalciumHydroxide

Ca(OH)

2

+Δ(heat)

∴ Calcium Hydroxide is produced.

The new volume of the gas in the balloon when the pressure is doubled is determined as 11.2 L.

The new volume of the balloon is determined by applying general gas equation as shown below

P₁V₁/T₁ = P₂V₂/T₂

Where;

\(\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2} \\\\V_2 = \frac{P_1V_1T_2}{T_1P_2} \\\\V_2 = \frac{1 \times 22.4 \times 273}{273 \times 2} \\\\V_2 = 11.2 \ L\)

Thus, the new volume of the gas in the balloon when the pressure is doubled is determined as 11.2 L.

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Answer: 0.83 m/s

Linear motion consists of 2: constant velocity motion with constant velocity and uniformly accelerated motion with constant acceleration

For various types of solvents, the effect of temperature on the enzyme kinetics and mass transfer coefficients varies.

What does this study reveal?

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The mass of the piece of cork is determined by its density, which can vary depending on the specific type of cork.

To calculate the mass of the piece of cork, we need to know its density. Density is defined as the mass per unit volume of a substance. However, the question only provides the volume of the cork, which is 35.5 milliliters (ml). Without the density, we cannot directly determine the mass.

To find the mass, we need to multiply the volume by the density of the cork. Density is typically expressed in grams per milliliter (g/ml) or grams per cubic centimeter (g/cm³). Once we have the density, we can use the formula:

Mass (g) = Volume (ml) x Density (g/ml)

Without information about the density of the cork, we cannot accurately calculate its mass. Therefore, we need additional data or specifications to proceed with the calculation.

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The pH scale will tell us how acid or basic a substance is, and this scale goes from 0 to 14. If you have a substance with a value below 7, it means this is an acidic substance, and if it's over 7, that means this is a basic substance. Bleach is a perfect example of everyday basic substance, since its pH is between 11-13, we will have in this case a very basic product

Answer:

+2

Explanation:

Elements in group 2A have 2 valence electrons in their outer shell, so when they bond with other atoms, they are most likely to give away these 2 electrons. With 2 electrons gone, the ion will have a positive charge (since there are now more protons than electrons in the atom).

Answer:

d) burning fossil fuels

Explanation:

We humans burn fossil fuels the most

In this question, we have to choose two neutral atoms that will present the same number of valence shell electrons, in order to do that, we can look for these elements in the periodic table, the elements that are in the same group will have the same number of electrons in the valence shell, this is the case of Sulfur and Selenium, both are in group 6 and present 6 electrons in the valence shell

This means that in one molecule of magnesium oxide, there is one magnesium cation with a charge of +2 and one oxygen anion with a charge of -2.

In a chemical formula, numbers written after the symbol of each element indicate number of atoms of that element present in one molecule of the compound. To determine the overall charge of the compound, we need to take into account the charges of the individual atoms.

In the case of magnesium oxide (MgO), magnesium is metal and tends to lose two electrons to form cation with a charge of +2 and oxygen is a nonmetal and tends to gain two electrons to form anion with charge of -2. This means that in one molecule of magnesium oxide, there is one magnesium cation with charge of +2 and one oxygen anion with a charge of -2.

If we were to write chemical formula as Mg⁺² and O₂⁻², this would imply that there are two oxygen anions, each with a charge of -2. However, in magnesium oxide, there is only one oxygen atom, and therefore, we need to write the chemical formula as MgO to correctly represent the composition of the compound.

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Answer:

saturated compounds have a large amount of solute in them, unsaturated solutions do not

Explanation:

9.8 × 10-9 × 10-2

9.8 × 10-2 nm

Diameter of a helium atom = 0.098 nm

Answer:

and id say maybe

Explanation:

Light waves travel much faster than sound waves.

From the given information , the pH of a 0.40 M solution of K2SO3 is approximately 8.45.

Step 1: Write the balanced chemical equation for the dissociation of K2SO3 in water.

K2SO3 (aq) ↔ 2K+ (aq) + SO3^2- (aq)

Step 2: Identify the ions formed and their concentrations.

From the balanced equation, we can see that for every 1 mole of K2SO3 that dissolves, 2 moles of K+ and 1 mole of SO3^2- ions are produced. Therefore, the concentration of K+ ions is 2 × 0.40 M = 0.80 M, and the concentration of SO3^2- ions is 0.40 M.

Step 3: Determine the hydrolysis reaction and equilibrium expression.

The K+ ion does not undergo hydrolysis since it is the conjugate cation of a strong base. However, the SO3^2- ion can hydrolyze in water according to the following reaction:

SO3^2- (aq) + H2O (l) ↔ HSO3^- (aq) + OH^- (aq)

The equilibrium expression for this hydrolysis reaction is:

Kw = [HSO3^-] [OH^-] / [SO3^2-]

Step 4: Set up an ICE (Initial, Change, Equilibrium) table.

Let x be the concentration of OH^-. Since 1 mole of OH^- is produced for every 1 mole of SO3^2- that hydrolyzes, the change in concentration for OH^- is also x. The initial concentration of SO3^2- is 0.40 M, and the initial concentration of HSO3^- is assumed to be negligible. The initial concentration of OH^- is 0 M.

Initial: [SO3^2-] = 0.40 M, [HSO3^-] = 0 M, [OH^-] = 0 M

Change: [SO3^2-] = -x M, [HSO3^-] = x M, [OH^-] = x M

Equilibrium: [SO3^2-] = 0.40 - x M, [HSO3^-] = x M, [OH^-] = x M

Step 5: Substitute the equilibrium concentrations into the equilibrium expression.

Kw = [x] [x] / [0.40 - x]

Step 6: Simplify the expression and solve for x.

Since the concentration of OH^- is much smaller than 0.40 M, we can approximate 0.40 - x to be 0.40.

Kw = x^2 / 0.40

Given that Kw is 1.0 × 10^-14 at 25°C, we can solve for x:

1.0 × 10^-14 = x^2 / 0.40

x^2 = 1.0 × 10^-14 × 0.40

x = √(1.0 × 10^-14 × 0.40)

x ≈ 6.32 × 10^-8 M

Step 7: Calculate the pOH and pH.

pOH = -log10 [OH^-] = -log10 (6.32 × 10^-8) ≈ 7.20

pH = 14 - pOH ≈ 14 - 7.20 ≈ 6.80

The pH of a 0.40 M solution of K2SO3 is approximately 8.45.

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The final volume of the system is 325 L.

The change in internal energy of a system is equal to the heat added or removed from the system plus the work done on or by the system. In this case, the change in internal energy is -325 J, and the system loses 155 J of energy as heat.

To find the work done by the system, we need to use the equation: work = -pressure * change in volume.

Given that the initial volume is 15.0 L and the initial pressure is 1.00 atm, we can calculate the work done as follows:

work = -1.00 atm * change in volume

Now, let's solve for the change in volume:

work = -1.00 atm * change in volume
-325 J = -1.00 atm * change in volume

To find the final volume, we rearrange the equation:

change in volume = -325 J / -1.00 atm

The units of atm and J will cancel out, leaving us with the final volume in liters:

change in volume = 325 L atm / 1 atm
change in volume = 325 L

Therefore, the final volume of the system is 325 L.

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Our sun is a star that is fueled by a specific type of nuclear reaction. The type of nuclear reaction is Fusion.

When two atoms collide to create a heavier atom, such as when two hydrogen atoms combine to create one helium atom, this process is known as fusion. The Sun is a main-sequence star, and thus generates its energy by nuclear fusion of hydrogen nuclei into helium.

This process generates enormous amounts of energy, many times more than fission, and powers the sun. Furthermore, it doesn't generate radioactive fission products.

Scientists are studying fusion processes, but they are challenging to maintain for extended periods of time due to the extreme pressure and temperature required to fuse the nuclei together.

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The career qualification that is unique to the Energy Transmission pathway and not to the Energy Distribution pathway is the knowledge and expertise in high-voltage power transmission.

Energy Transmission involves the bulk transportation of electricity at high voltages, over long distances, while Energy Distribution involves the delivery of electricity to end-users at lower voltages through local networks. Professionals in the Energy Transmission pathway need to have a deep understanding of high-voltage equipment and systems, including transformers, transmission lines, and substation infrastructure.

This expertise is critical in ensuring the safe and reliable transmission of large amounts of electricity across the grid. Therefore, a career in Energy Transmission requires specialized training and certification in high-voltage power transmission, which is not required in the Energy Distribution pathway.

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Answer:

When an atom gains/loses an electron, the atom becomes charged, and is called an ion. Gaining an electron results in a negative charge, so the atom is an anion. Losing an electron results in a positive charge, so atom ion is a cation

Explanation:

Answerd the question : ion

Answer: Chemistry, the science that deals with the properties, composition, and structure of substances (defined as elements and compounds), the transformations they undergo, and the energy that is released or absorbed during these processes.

Explanation:

Answer:

what is the story about actually.i think it's from ur lesson

Explanation:

certain breads mold easily...(fact)..

especially white bread., when exposed to any moisture, from refrigeration, or freezing..

when taken out of (cold environment), humidity in air causes molding because you take it from cold to/warm environment.

check expiration dates, keep refrigerated, and inspect 4 molding. Companies like WMART, buy in bulk, when on shelf, defrosts,, then has molding within expiration dates..