Which element in Period 2 has the least mass

The number of moles of solute particles present in a 269 ml solution of 0.173 M CaCl₂ is 0.0463 moles.

To calculate the number of moles of solute particles, we need to consider that CaCl₂ dissociates completely in water, resulting in three moles of solute particles per mole of CaCl₂.

The concentration of the CaCl₂ solution is 0.173 M, we can use the formula:

moles of solute = concentration × volume

Converting the volume from milliliters (ml) to liters (L) by dividing by 1000, we have:

0.269 L × 0.173 mol/L = 0.0463 moles of CaCl₂

Since each mole of CaCl₂ dissociates into three moles of solute particles (Ca²⁺ and 2 Cl⁻), the total number of moles of solute particles in the solution is also 0.0463 moles.

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Answer:

Not me

Explanation:

Answer:

The presence of a brightly colored, detachable tail can be advantageous for some lizards because it serves as a distraction or decoy for predators. When a predator attacks, the lizard can quickly detach its tail, which wriggles and continues to move for a short period of time. This sudden movement can divert the predator's attention away from the lizard's body, allowing the lizard to escape.

The bright coloration of the tail can also help to draw the predator's attention towards it, instead of the lizard's body. Bright colors are often used in the animal kingdom as warning signals, indicating that an animal is toxic or dangerous. While the lizard may not necessarily be toxic or dangerous, the bright colors of its tail can create a similar effect, deterring predators from attacking in the first place.

Additionally, the detachable tail can serve as a form of self-defense, allowing the lizard to escape from a predator's grasp. By detaching its tail, the lizard can leave the predator with a distraction while it makes its escape. Over time, the lizard can regrow its tail, allowing it to continue to use this defense mechanism in the future.

Answer:

Explanation:

At STP, 1 mole of hydrogen can occupy a volume of 22.4 liters. At STP, 3 moles of hydrogen can occupy a volume of 2×22. 4=44. 8 liters

Answer:

The answer is eight atoms.

Answer:

N, P, As, Sb

Explanation:

Elements present in the same group having same number of valence electrons. The first option is correct from given options because nitrogen, phosphorus, arsenic and antimony are present in same group thus having same number of electrons in outer most  energy level.

Electronic configuration of N:

N₇: [He] 2s² 2p³

Electronic configuration of P:

P₁₅: [Ne] 3s² 3p³

Electronic configuration As:

As₃₃: [Ar] 3d¹⁰ 4s² 4p³

Electronic configuration Sb:

Sb₅₁: [Kr] 4d¹⁰ 5s² 5p³

Here it is clear from electronic configuration all these elements have five number of valence electrons.

Answer:

B. Distributed over a very wide range

D. Limited life existence in geologic time.

Explanation:

Index fossils are very unique fossils that helps in determining the relative ages of rocks and biostratigraphic correlation. They are usually called guide fossils.

Answer:

d and b

Explanation:

THF (tetrahydrofolate) is a methyl group donor in biological reactions.
SAM (s‑adenosyl methionine) is a methyl group donor in biological reactions.
Cys (cysteine) is a thiol group donor in biological reactions.
Glu (glutamate) is an amino group donor in biological reactions.

It is important to note that formyl groups are not mentioned in this question, but they are typically involved in reactions that add a formyl group to a molecule.

The following classify these molecules based on their roles as donors in biological reactions:

1. THF (Tetrahydrofolate) - Formyl group donor
2. SAM (S-Adenosyl methionine) - Methyl group donor
3. CYS (Cysteine) - Thiol group donor
4. GLU (Glutamate) - Amino group donor

These classifications are based on the functional groups these molecules typically donate during biological reactions.

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Answer:

NaOH

Explanation:

the balance equation is HBr +NaOH----> NaBr+ H2O. The salt formed is NaBr, sodium,Bromide

Answer:

a free-falling object is an object that is falling under the sole influence of gravity. That is to say that any object that is moving and being acted upon only be the force of gravity is said to be "in a state of free fall." Such an object will experience a downward acceleration of 9.8 m/s/s.

Answer:

Explanation:

The answer is rooot ok

the food is prepared in the form of starch in potato and ginger plants the food is stored in the Ender Ground Park gender and potato or underground stems while potato is a tuber Ginger is a rhizome in the food is stored in them in the form of starch so it is prepared in the leaves.

Answer: Hund’s rule

Explanation:

Answer:

To avoid spattering

Explanation:

If we are heating a hydrate to drive off the water of crystallization, we must initially heat the hydrate gently, at a lower temperature and then more strongly only after most of the water has been driven off in order to to prevent spattering.

Since we obtain the amount of water by the mass difference, Spattering  decreases the mass of water obtained and ultimately results in a lower percent of water being calculated for the hydrate.

Answer:

and the question is?

Explanation:

Answer:

Explanation:

Vinegar contains acetic acid, and baking soda is sodium hydrogen carbonate. When they are combined, a reaction occurs and bubbles form. Which gas is in the bubbles, and why do the bubbles form? Oxygen gas forms because an acid reacts with a metal.

( if you want to copy and paste make sure to rephrase it)

Answer:

Because the gravitational force alters

Explanation:

All statements given in the question are incorrect except for 1 statement. The correct statement is:1 s = 10^3 ms.

In the question, we have been provided with 5 statements. We are asked to select all the correct statements from those 5 statements. Given below are for each statement:1 g = 10^3 mg:This is incorrect. 1 g is equal to 1000 mg.10^-3 g = 10^12 ng:This is incorrect. 10^-3 g is equal to 1 mg.1 km = 10^5 mm:This is incorrect. 1 km is equal to 1,000,000 mm.1 s = 10^6 μs:This is incorrect. 1 s is equal to 1,000,000 μs.1 s = 10^3 ms:This is correct. 1 s is equal to 1000 ms.Therefore, the main answer to this question is that only 1 statement is correct, which is:1 s = 10^3 ms.

Metric units are based on the power of ten. The base units of the International System of Units (SI) are the meter, kilogram, second, kelvin, ampere, mole, and candela. All other metric units can be derived from these basic units.The first unit in each conversion is in grams, seconds, or kilometers. The metric units for millimeters, microseconds, and nanograms are derived from these basic units. One gram is equal to 1000 milligrams (mg), 1 second is equal to 1000 milliseconds (ms), and 1 kilometer is equal to 1000000 millimeters (mm). 10^-3 g is equal to 1 milligram (mg), 10^6 μs is equal to 1 second (s), and 10^12 ng is equal to 1 gram (g).

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Answer:

Over a vast amount of time, millions of years, the earth gradually cooled. When the temperature dropped enough, water vapor condensed and went from a gas to liquid form. This created clouds. From these clouds, the oceans formed and the oceans absorbed a lot of the carbon dioxide in the atmosphere.

Explanation:

The reaction of benzaldehyde with acetone and sodium hydroxide produces DibenzalacetoneThis is an example of an aldol condensation reaction.

A physical reaction is a reaction in which a change in the physical properties of matter or substances occurs. Physical properties include density, mass, and volume. The definition of a physical reaction is a reaction in which molecules undergo molecular rearrangements but do not change chemically.

A response, although technically a reaction, takes into account the desired outcome of the interaction. Reactions can produce positive or negative results, but reactions are designed to produce positive or negative results. To react is emotional, to react is emotional intelligence.

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Answer:

8

Explanation:

Answer: 164.09 g/mol

Explanation:

Thomson proposed that the atom was made up of a diffuse positive charge with minuscule, dispersed negatively charged electrons. There were no additional elements added to Thomson's updated model of the atom that would have allowed scientists to distinguish between various types of elements.

The scientific idea that matter is made up of tiny units called atoms is known as the "atomic theory." Atomism, a prehistoric philosophical movement, is where the atomic theory's roots can be found.

Atomic models are models used to describe the structure of atoms.

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The combined mass of hydrochloric acid and sodium hydroxide is determined by adding their individual masses.

When calculating the combined mass of hydrochloric acid and sodium hydroxide, we need to consider the individual masses of these two substances. Hydrochloric acid (HCl) has a molecular formula of HCl and consists of one hydrogen atom (H) and one chlorine atom (Cl). Sodium hydroxide (NaOH), on the other hand, is composed of one sodium atom (Na), one oxygen atom (O), and one hydrogen atom (H). To calculate the combined mass, we add the individual masses of these reactants.

The molar mass of hydrogen (H) is approximately 1 gram/mol, while the molar mass of chlorine (Cl) is approximately 35.5 grams/mol. Sodium (Na) has a molar mass of around 23 grams/mol, oxygen (O) has a molar mass of approximately 16 grams/mol, and hydrogen (H) has a molar mass of around 1 gram/mol.

To determine the combined mass of hydrochloric acid and sodium hydroxide, we multiply the number of atoms of each element by their respective molar masses and sum them up. For example, hydrochloric acid has one hydrogen atom and one chlorine atom, so the total mass would be 1 gram/mol (hydrogen) + 35.5 grams/mol (chlorine). Similarly, sodium hydroxide has one sodium atom, one oxygen atom, and one hydrogen atom, resulting in a combined mass of 23 grams/mol (sodium) + 16 grams/mol (oxygen) + 1 gram/mol (hydrogen).

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Answer:

Explanation:

Carbon cycle explains the movement of carbon between the earth's biosphere, geosphere, hydrosphere and atmosphere. ... Carbon atoms are then released as carbon dioxide when organisms respire. The formation of fossil fuels and sedimentary rocks contribute to the carbon cycle for very long periods.

When we have an acid-base reaction, the acid will be that substance that donates protons, in the form of H+ ions. The base will be the one that accepts the H+ ions. Now, the base that accepts the protons becomes a potential proton donor, thus becoming a conjugate acid. This is the case with H3O+.

H2O accepts H+ ions, so it is a base and when it becomes H3O+ it becomes a potential H+ proton donor, that is, a conjugate acid.

so, the answer will be B. Conjugate acid

The mole is used to measure small particles like atoms and molecules.  The 4 moles of silver is equivalent to \(\bold{2.408 x 10^2^4 }\) atoms.

Given here,

The number of atoms

\(\bold{2.408 x 10^2^4 }\)

Number of moles = ?

1 mol of substance = \(\bold{ 6.02 x10^2^3}\)

Hence,

moles of silver,

\(\bold {= \dfrac {2.408 x 10^2^4 } { 6.02 x10^2^3} }}\\\\\bold {= 4 mol}\)

Therefore, the 4 moles of silver is equivalent to \(\bold{2.408 x 10^2^4 }\) atoms.

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An energy change occurs during the breaking and forming of bonds is true  for most chemical reactions an energy change occurs during the breaking and forming of bonds​ .

Chemical bonds between atoms and molecules can break and form during chemical reactions. Existing bonds must be broken in order for new ones to form, which releases energy during the process. The enthalpy change or overall energy change during a chemical reaction is typically expressed as the energy difference between the products and the reactants.

Depending on whether energy is absorbed or released during a reaction, the enthalpy change can either be positive or negative. The reaction is exothermic and energy is released if the enthalpy of the products is lower than the enthalpy of the reactants. The reaction is endothermic and energy is absorbed if the enthalpy of the products is greater than the enthalpy of the reactants.

The question is incomplete, complete question will be "Which statement is true for most chemical reactions?

An energy change occurs during the breaking and forming of bonds.

The internal energy of the system increases during a reaction.

Energy is released during the formation of reactants.

The enthalpy of the products is higher than the enthalpy of the reactants."

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