When you touch a hot plate, the transfer of heat from the plate to your hand is called ______.

Answer:

its sodium hydroxide

Explanation:

Answer: to determine the level of radionuclides present.

Answer: A

Explanation:

Answer:

Explanation:

Thus, negative beta decay results in a daughter nucleus, the proton number (atomic number) of which is one more than its parent but the mass number (total number of neutrons and protons) of which is the same. For example, hydrogen-3 (atomic number 1, mass number 3) decays to helium-3 (atomic number 2, mass number 3)

Answer:

D. Na+

Explanation:

Na+ is the only ion here that is not related to pH. Adding OH- increases pH, and adding H3O+ or H+ (the two are interchangeable) decreases pH.

Approximately 166.67 mL of water needs to be evaporated from 250 mL of 1 M Ca(OH)2 to make it 3 M.

The relationship between the initial and final concentrations and volumes must be taken into account.

Given: Initial concentration \((C^1) = 1 M Initial volume (V^1) = 250 mL\)

\((C^2) = 3 M final concentration\)

We can use the equation:

\(C^1 * V^1 = C^2 * V^2\)

Where:

\(V^2\)is the final volume of the solution

Rearranging the equation to solve for V2:

\(V^2 = (C^1 * V^1) / C^2\)

Substituting the given values:

\(V^2 = (1 M * 250 mL) / 3 M\)

\(V^2 = 250 mL / 3\)

\(V^2\) ≈ \(83.33 mL\)

To find the amount of water that needs to be evaporated, we subtract the final volume from the initial volume:

Amount of water to be evaporated = \(V^1 - V^2\)

Amount of water to be evaporated = 250 mL - 83.33 mL

Amount of water to be evaporated ≈ 166.67 mL

Therefore, approximately 166.67 mL of water needs to be evaporated from 250 mL of 1 M Ca(OH)2 to make it 3 M.

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Answer:

See explanation

Explanation:

A saturated solution is a solution that contains just as much solute as it can normally hold at that temperature.

If the temperature is cooled and  crystals of copper sulphate are formed in the solution, then the solution is no longer saturated because some solute are now leaving the solution.

b) percent by mass = mass of solute/mass of solution * 100

percent by mass = 20%

mass of solute = x g

mass of solution =  80 g​

20 = x/80 * 100

1600 = 100x

x = 1600/100

x = 16 g

The number of C atoms in 0.247 mol of C is  1.48 X 10²³ .

The number of C atoms in 1 mol of C is 6.02 X 10²³, which is also called Avogadro’s number .

so, The number of C atoms in 0.247 mol of C is _

0.247x6.02x10²³= 1.48 X 10²³.

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Explanation:

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The initial speed of the boy's thrown is determined as 16.03 m/s.

The initial speed of the throw is calculated as follows;

h = vt - ¹/₂gt²

4 = 3t - (0.5)(9.8)(3)²

4 = 3t - 44.1

3t = 48.1

t = 48.1/3

t = 16.03 m/s

Thus, the initial speed of the boy's thrown is determined as 16.03 m/s.

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Answer: C

Explanation:

Answer:

27% hope this helps

Explanation:

hope I helped u

Answer:

C

Explanation:

Line graphs are better to show the relations between over time, as circle shows the amount or present of something in a cert time

Let's pass through each option.

Octet rule is a rule about the number of bonds an element can make, so it is related to structure of molecules, not reaction.

The Ideal Gas law has nothing to do with reaction, it works with conditions of ideal gases.

Both Law of Conservation of Mass and Law of Multiple Proportions have their part on chemical reactions.

Law of Multiple Proportions works with the proportions of the chemicals involved on the reactions and their stoichiometry, but not its balancing.

Law of Conservation of Mass says that no mass can be destroyied or created on a chemical reaction, and as a result, the reaction has to be balanced, so there are no elements appearing or desapearing.

So, the correct option is Law of Conservation of Mass

Answer:

the answer is copper pipe

Answer:

a. SOLUTION:

Step 1: Write the balanced chemical equation.

C₂H₄ + 3O₂ → 2CO₂ + 2H₂O

Step 2: Calculate the number of moles of CO₂ formed by each reactant.

• Using C₂H₄

Based on the balanced chemical equation, 1 mole of C₂H₄ is stoichiometrically equivalent to 2 moles of CO₂.

The molar mass of C₂H₄ is 28.054 g/mol.

• Using O₂

Based on the balanced chemical equation, 3 moles of O₂ is stoichiometrically equivalent to 2 mole of CO₂.

The molar mass of O₂ is 31.998 g/mol.

Step 3: Determine the limiting reagent.

Since O₂ produced less amount of CO₂ than C₂H₄, O₂ is the limiting reagent.

Step 4: Determine the mass of CO₂ formed.

Note that the (maximum) mass of a product that can be formed is dictated by the limiting reagent. In this case, we will start at the number of moles of CO₂ formed from the limiting reagent (O₂) which is equal to 0.11022 mol.

The molar mass of CO₂ is 44.009 g.

Hence, 4.85 g of CO₂ can be formed.

------------------------------------------------------------

b. ANSWER:

The LR is O₂ and the ER is C₂H₄.

------------------------------------------------------------

c. SOLUTION:

The theoretical yield of the reaction is 4.85 g.

Hence, the percent yield of the reaction is 87.6%.

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Explanation:

brainliest pls

Answer:

3787500 Torr

Explanation:

1 Pascal = 0.0075 Torr

So:

5.05x10^8 Pa --- x

1 Pa --- 0.0075 Torr

x = 5.05x10^8 × 0.0075

x = 3787500 Torr

Answer:

sorry

Explanation:

Answer:

PbO2

Lead(IV) oxide/Formula

Explanation:

project

Answer:

301.15 K

Explanation:

Answer:

A.  

Explanation:

The β-sheet is a twisted pattern in which the protein strands are laterally linked through hydrogen bonds. These β-sheet motifs are segments of 3 to 10 amino acids that are specially configured to form beta antiparallel strands. In β-sheet regions, the hydrogen bonds are localized among carbonyl and amino groups of the polypeptide backbone, and side chains (i.e., the R groups) are extended up and down in the plane of the β-sheet.

Answer:

the the that keeps the water cycle going is heat

Answer:

O generation of winds

Explanation:

The uneven heating causes temperature differences, which in turn cause air currents (wind) to develop, which then move heat from where there is more heat (higher temperatures) to where there is less heat (lower temperatures). The atmosphere thus becomes a giant "heat engine", continuously driven by the sun.

The conclusion that can be extracted based on the data is the violent crime rate is higher when the lead level is higher. The correct option is A.

When someone physically harms or threatens to harm another person, it is considered a violent crime. This definition also includes offenses including the use of a weapon.

Violent crime significantly alters the environment. Because certain weapons used in these crimes can emit toxic elements like lead and arsenic. It has a severe impact on health. As a result, the graph makes sense when four cities are mentioned.

Future antisocial and criminal conduct is significantly increased when children are exposed to lead through drinking water, paint, and soil.

Therefore, the correct option is A. The violent crime rate is higher when the lead level is higher.

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Because there are 2 Cl on the left, we will put a coefficient 2in front of HCl on the right side to balance out the Cl. This would result in an unequal amount of H, with 6 on the right side and 7 in the left, so we have to put a coefficient of 2 in front of C6H5OH and C6H4OH on both sides to balance out the H. By doing this, we would obtain an equal amount of H on both sides. The Carbon is already balanced, and so is the Oxygen.

The balanced chemical reaction equation for the reaction between aromatic phenol and chlorine gas in the presence of FeCl3 as catalyst is as follows;

C6H6O + Cl2 -------> C6H5OCl + HCl

An aromatic compound has 4n + 2 number of pi electrons. This condition is satisfied by phenol. Hence, phenol has the stability associated with aromatic compounds.

The reaction of phenol with chlorine in the presence of a catalyst such as FeCl3 is an aromatic electrophillic substitution reaction.

This reaction yields a chlorinated phenol (one of the aromatic hydrogen atoms attached directly to a C atom is replaced with a chlorine  atom and chlorophenol is formed).

A balanced chemical reaction equation is one in which the number of atoms of each element at the reactant side and the product side are equal. This condition is satisfied for the reaction;

C6H6O + Cl2 -------> C6H5OCl + HCl

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The number of atoms in the reactants and products of each reaction is the same. The last option.

The law of conservation of matter states that during chemical reactions, matter can neither be created nor destroyed but can be converted from one form to another. This law is also applicable to energy and atoms during chemical reactions.

In other words, all chemical reactions, as a rule of thumb, obey the law of conservation. Thus, for any chemical reaction:

Therefore, the statement that supports the student's conclusion that the two reactions follows the law of conservation of matter would be that the number of atoms in the reactants and products of each reaction is the same.

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The bond lengths that would have the strongest bond is option  C:174 pm

The link gets shorter every time two nuclei are drawn closer together to form a stronger bond. The nuclei are drawn closer to one another by the coulombic attraction on the bonding electrons, resulting in a shorter bond.

Therefore, In addition, the interaction and bond strength increase in proportion to how much they pull apart. This also perfectly suits with bond orders. In comparison to a single bond between the same two atoms, a double bond is both stronger and shorter and it smaller number than bigger numbers.

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Answer:

Non Renewable would be correct option

Explanation:

Non Renewable resources are resources that cannot be replenished within a lifetime.

These resources cannot be replaced after once used.

Examples of Non Renewable resources are Coal , Petroleum & gas etc .

Answer: d = 0.958 g/cm³

Explanation:

Density = mass/volume

d = g/cm³ or d = g/mL

Note: cm³ = mL

d = 43.0 g/4.80 cm³

d = 8.96 g/cm³

Three significant figures are in the final answer since there are three significant figures in 4.80 cm³ and 43.0 g.

Answer:

Its Carbon

Explanation:

The partial charges on each fluorine atom are negative. Option B) The central O atom is the correct answer. Option B

The partial charges in a molecule are determined by the electronegativity values of the atoms involved. Electronegativity is the ability of an atom to attract electrons towards itself in a chemical bond. In the case of \(F_2O\), fluorine (F) is more electronegative than oxygen.

Fluorine is the most electronegative element on the periodic table, meaning it has a high ability to attract electrons. Oxygen is also relatively electronegative but less so than fluorine. When fluorine atoms bond with oxygen, the shared electrons will be pulled more towards the fluorine atoms, creating a polar covalent bond.

In \(F_2O\), each fluorine atom will pull the shared electrons towards itself, resulting in a higher electron density around the fluorine atoms. This creates a region of partial negative charge around the fluorine atoms.

Conversely, the oxygen atom will have a region of lower electron density and, therefore, a partial positive charge. This is because the shared electrons spend more time around the fluorine atoms due to their higher electronegativity.

Option B

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