please HELP!! will mark brainiest

Answer:

IT MUST BURN!

Explanation:

That is basically how most solids are broken down

Answer:

current energy ⇒ light energy  + heat energy

Explanation:

Answer:

Óxido de magnesio

Concepto:Es un óxido metálico, formado por magnesio y oxígeno, de estructura iónica cuya fórmula química es MgO.

Answer:

Chemical change because a new substance, a gas, is produced

Explanation:

There are two types of changes that occurs in reactions viz: physical change and chemical change. Physical changes are those changes that does not alter the chemical composition of the reacting substances, hence, no new substances are formed e.g freezing, melting, change of state.

On the other hand, chemical changes affect the chemical composition of the reactants, hence, new substances characterized by increase in temperature, formation of gaseous bubbles occur.

In this case, vinegar and baking soda are mixed in a container, which resulted in the formation of bubbles and slight increase in the solution's temperature. This indicates that a CHEMICAL CHANGE occured because a new substance, a gas, is produced.

Answer:

V Ta is more reactive, hope this helps!

Answer:

Explanation:

NaNO3

Just do a double displacement reaction, this is what you get (plus water)

The reaction shifts to the left, and the concentrations of SO2(g) and O2(g) increase.

Simply put, the system will seek to stay at equilibrium by shifting to compensate for change.

Complicatedly put, consider the fact that K (the equilibrium constant) is the concentration of products raised to their coefficients over the concentration of the reactants raised to their coefficients. If we write an expression for K, we get this:

\(K=\frac{[SO_3]^2}{[SO_2]^2[O_2]}\)

If we assume that, at equilibrium, all of the substances have a concentration of 1 molar, we get that

\(K=\frac{[1]^2}{[1]^2[1]}=1\)

If we increase SO3, K will increase. This means the system has now been removed from equilibrium. For example, if you add another mole of SO3, you get

\(Q=\frac{[2]^2}{[1]^2[1]}=4\)

(Q is just K, but not at equilibrium.)

Since the system wants to stay at equilibrium, it will work to restore equilibrium. The only way to do this is to increase the value of the reactants (the bottom numbers), meaning the reaction will shift to the left. Worded differently, when Q>K, the reaction will shift left.

Answer:

Magnesium + iron chloride   →    iron + magnesium chloride

Explanation:

It is the single replacement reaction.

Single replacement:

It is the reaction in which one elements replace the other element in compound.

AB + C → AC + B

Molecular equation:

Magnesium + iron chloride   →    iron + magnesium chloride

Chemical equation:

Mg(s)  + FeCl₂(aq)       →     MgCl₂(aq) + Fe(s)

Ionic equation:

Mg(s)  + Fe²⁺(aq) + 2Cl⁻(aq)       →     Mg²⁺(aq) + 2Cl⁻(aq) + Fe(s)

Net ionic equation:

Mg(s) + Fe²⁺(aq)      →   Fe(s) + Mg²⁺(aq)

The Electron Pair Valence Shell Recoil model, based on a configuration that minimises the repulsion for shared or unshared electron pairs surrounding the core atom, postulates that "Electron Clouds" repel one another to a degree that the overall shape of the molecule is altered.

Bond length and bond distance refers to the equilibrium separation between the two atoms' nuclei that together make up a covalent bond.Typically, it is expressed in angstroms and nanometers.

A average distance between the nuclei of two bound atoms in a molecule is referred to as bond length or bond length in molecular geometry.

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Answer:

There are two chloride ions for each calcium ion

Explanation:

The compound has to have an overall neutral charge. Meaning that the positive charges from calcium have to be canceled out by the negative charges of chlorine.

If there are two chloride ions for each calcium ion, the charges would cancel themselves out (2 * -1 would cancel out with +2).

Answer:

True

Explanation:

Hydrogen has three naturally occuring isotopes and copper has two.

Answer: By the very laws of the universe, matter cannot be created or destroyed, the Big Bang cannot have happened by its own power. There was a creator involved.

A solid sample has a MP of 133 - 137°C. one can conclude about the sample is It is relatively impure.

the temperature at which a compound completely melts is called as melting point but generally we don't observe a melting point rather a range is observed  if range more than 20 C is observed generally it's said that it's impure an impure solid melts over a wide range and at a temperature lower than that of the pure solid. so since the last value 139 0 C must be the reported value when you must have seen it completely melting so it's melting point should be this only .

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According to the statement Halibut food provides the most magnesium per serving.

Along with many other essential tasks, manganese helps the body's muscles, neurons, and energy production. Usually, neither symptom occurs when serum sodium levels are low. Conversely, consistently low levels can increase your risk of coronary disease, prediabetes, hypertension, osteoporosis, especially high blood pressure.

Mg is a nutrient that the body needs to be healthy. Magnesium is necessary for many internal processes, including the production of DNA, calcium, and proteins as well as the dilation of blood vessels, sugar levels, and the health of muscles and neurons.

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The temperature from the metal is transferred to water. Hence the heat lost by the metal is equal to the heat gained by water. Then using calorimetric equation, mass of gold is , 353.8 g.

Calorimetry is an analytical technique used to determine the heat energy absorbed or evolved by a system. The calorimetric equation relating the heat energy q with the mass m, specific heat c and the temperature difference ΔT is :

q = m c ΔT

Here, the heat energy absorbed by water in the calorimeter is equal to the heat evolved from the hot gold metal.

given c of gold = 0.130 J/°C g

c of water = 4.12 J/°C g

temperature difference for water = 45- 20 °C = 25°C

thus, 25°C is lost from the metal.

Then, Mg × 0.130 J/°C g × (150 -25°C ) = 50 g × 4.12 J/°C g × 25°C

then Mg = 353.8 g.

Therefore, mass of gold is 353.8 g.

In similar way, we can find the final temperature of the second system if all other quantities are given.

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Answer:

(Click here to get an answer to your question ✍️ 0.385g of 17Cl is how many atoms?).

Explanation:

Answer:Set up a proportion os V1/n1 = V2/n2. V is the volume, n is the amount in MOLES, not grams. Convert the CO_2 to moles, then solve and find that the amount of N_2 should be the same amount of moles. Then use the molar mass of N_2 (28.02 grams/mole) to convert that amount of moles into grams. That's your answer.

Explanation:

A redox reaction is a chemical reaction in which one or more of the reacting species undergoes oxidation and one or more undergoes reduction. An oxidizing agent is an element or compound that oxidizes another substance, while a reducing agent is an element or compound that reduces another substance.

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Minerals with an electric charge called electrolytes are found in your body. They can be found in various bodily fluids such as urine, tissues, and blood.

Why are electrolytes important?

Electrolytes are crucial because they aid in:

The many electrolytes include sodium, calcium, potassium, chloride, phosphate, and magnesium. They come from the foods we consume and the liquids we drink.

The body's electrolyte levels might get too high or too low when the body's water balance changes. The amount of water we consume and lose should be equal. If something throws off this equilibrium, we can be dehydrated or have too much water on our body (overhydration).

The water balance can be thrown off by a number of factors, including some medications, nausea, diarrhea, perspiration, and liver or kidney issues.

We can regulate the imbalance with the aid of treatment. Additionally, the cause of the imbalance must be determined and addressed.

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When you buy a municipal bond for $10,000 with a 4% interest rate and hold it until maturity in 10 years, you would typically receive interest payments semiannually.

Municipal bonds usually pay interest on a semiannual basis, meaning you receive two payments each year. To calculate the interest payment amount, you would divide the annual interest rate by 2, as you receive payments every six months. In this case, the annual interest rate is 4%, so the semiannual interest rate would be 2% (4% divided by 2). To determine the interest payment amount, you would multiply the bond's face value ($10,000) by the semiannual interest rate (2%). Thus, each interest payment would amount to $200 ($10,000 multiplied by 2%).

Over the course of 10 years, you would receive a total of 20 interest payments (2 payments per year for 10 years). Therefore, the cumulative interest payments would amount to $4,000 ($200 per payment multiplied by 20 payments). It's important to note that municipal bond interest payments and terms can vary, so it's essential to review the specific details of the bond before making any investment decisions.

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Answer: P2O5 is the empirical formula.

Explanation: When given percentages you can assume that many grams of each atom are in the compound. Then you divide grams by the molar mass of each element, giving you moles. Once you have moles, divide by the smaller molar amount, which should give you 1 mol of Phosphorus and 2.5 mol of Oxygen. Then multiply by 2 in order for both moles to be a whole number. This gets you 2 and 5.

The sign of the enthalpy change involved in the reaction is negative and the sign of work done is also negative.

A reaction takes place in a flexible container initially at 298 K  and volume 3L .then reaction takes place causes decrease in the volume to 2.5L and its temperature becomes 273 K.

    T1 = 298 K

    V1 = 3 L

    V2 = 2.5 L

    T2 = 273 K

The Enthalpy change is the name given to the amount of heat evolved or absorbed in a reaction carried out at constant pressure. It is given the symbol ΔH.

       H = U+PV

sign of enthalpy change involved in the reaction,

Volume decreases --> PV will decrease

T decreases --> change in energy decreases

so the enthalpy change must be negative, since the change or content of energy is getting lower and same in work done.

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Becca and Annie obtained a lower yield of sodium stearate in their saponification lab due to incorrect measurements of their reactants.

In the saponification lab, Becca and Annie expected to produce 0.224 g of sodium stearate, but they realized they made a mistake in measuring their reactants. As a result, they obtained only 0.112 g of sodium stearate, which is half of the expected yield.

Accurate measurement of reactants is crucial in chemical reactions to ensure the desired outcome. In this case, the incorrect measurements led to a lower amount of sodium stearate being produced. The reactants used in the lab were likely not in the correct stoichiometric ratio, which affected the yield of the desired product.

The stoichiometry of a reaction determines the ratio of reactants needed for complete conversion and optimal yield. If the reactants are not in the correct proportion, the reaction may not proceed to completion, leading to a lower yield of the desired product. In this case, the incorrect measurements resulted in an insufficient amount of reactants, leading to a lower yield of sodium stearate.

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In a cyclic voltammogram of an irreversible electrochemical reaction, only one peak is present (either anodic or cathodic) due to the limited reversibility of the reaction.

An irreversible reaction cannot be completely reversed so when the potential of the reaction is increased, the reaction will proceed in the same direction, leading to the formation of a single peak.

The peak represents the forward reaction, either the oxidation or reduction of the species in the reaction.

The magnitude of the peak depends on the rate of the forward reaction and the degree of reversibility of the reaction.

When the potential of the reaction is increased, the reaction will move further in the same direction, and the peak will become more prominent.

The peak will reach a maximum size when the reaction reaches its equilibrium potential, which occurs when the rate of the forward and reverse reactions are equal.

The magnitude of the peak also depends on the rate of diffusion of the species in the reaction. The peak will be smaller when the rate of diffusion is slow, and it will be larger when the rate of diffusion is fast.

The shape of the peak will depend on the degree of reversibility of the reaction, with more symmetrical peaks for reversible reactions and more asymmetrical peaks for irreversible reactions.

Only one peak is present in a cyclic voltammogram of an irreversible electrochemical reaction due to the limited reversibility of the reaction.

The magnitude of the peak is determined by the rate of the forward reaction, the rate of diffusion of the species, and the degree of reversibility of the reaction.

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Answer:

Scientists believe that convection circulation within the mantle helps continents to move. As heat from Earth's innermost layer—the core—transfers to the bottom layer of mantle rock, the rock warms, softens, and rises upward. ... This churning motion in the mantle appears to be a major factor in plate movement.

Explanation:

Answer:

Explanation:

The mass of the sun is about 1.98 x 10^30 kilograms. The mass of the earth is 5.97x 10^24 kilograms.

1.98 x 10^30 / 5.97x 10^24 = 331658 times greater

Answer:

Explanation:

The mass of the sun / the mass of the earth

= 1.98 x 10^30 / 5.97x 10^24

= 3.32 x 10^5 times greater

Answer:

Arrange them in order of greatest to least Molar Mass to get most dense to least dense at a given temperature and pressure.

Explanation:

"Given Temperature and Pressure" just tells you that those two variables are being held constant. The Ideal Gas Law (PV = nRT) shows that n (the # of moles) and V (the volume) are variable still. To keep pressure constant, we need to increase the volume so that the force per area is the same which would unfortunately lower the density. The only way for a gas to have the greatest density would be to have the least average kinetic energy to keep the pressure constant at a smaller volume. This is because kinetic energy is equal to KE = 1/2 m v^2, where m is mass in kilograms and v is the velocity. IT IS CRUCIAL TO NOTE THAT ACCORDING TO KINETIC MOLECULAR THEORY, ALL GASES HAVE THE SAME AVG. KINETIC ENERGY WHEN AT THE SAME TEMPERATURE. So since the avg. KE is also constant across these answers due to the temp. being constant, our only way to decrease the velocity (the rate at which the particles are moving per second) and in turn the number of collisions (to repeat, a smaller number of collisions is desired because they are equal to the pressure that must maintained at a constant value at the smallest volume possible to achieve highest density possible) is to increase the molar mass. This is also pretty intutive for the other part of the issue: since Density is a broken heart (m/v), a higher molar mass would ensure a smaller pressure (due to decreased velocity) and smaller volume (due to constant pressure). Okay, now order the gases heaviest to lightest in terms of molar mass and you got your answer. Please gimme brainliest if this helped bc it took 15 minutes to type out. Hope this helped you! :D

Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. The order of density is carbon dioxide>Neon >argon>carbon-12> hydrogen.

Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.

Mathematically,

Density of gas  = Molar Mass of the gas  ÷volume occupied by the given gases

Density is directly proportional to molar mass of the gases.

Molar mass of argon = 18g/mole

Molar mass of Neon = 20g/mole

Molar mass of carbon dioxide=44.01 g/mol

Molar mass of hydrogen=1g/mol

Molar mass of carbon-12=12g/mol

The order of gases from most dense to least dense at a given temperature and pressure is carbon dioxide>Neon >argon>carbon-12> hydrogen.

Therefore, the order of density is  carbon dioxide>Neon >argon>carbon-12> hydrogen.

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