Polyethylene is a polymer that is flexible and often used to make clear plastic wrap. How can this
polymer be changed to make it less flexible, stronger, and harder? (1 point)
O Cross-linking the layers of polyethylene using covalent bonds.
O Adding larger carbon atoms in between the layers to make them more stable.
O Shortening the length, the polymer so that it cannot bend as much.
O Changing the covalent bonds to ionic bonds, which are stronger.

Answer:

the particles of matter are arranged in different ways for the different states

Explanation:

because solid liquid and gas all three matters have different states for example the particles in a solid are closely packEd and form of movement is vibration

48 snickers will equal to two guffaws, substitute and simplify

please give brainliest

The answer is 48 snickers.

The unitary method is a technique for solving a problem by first finding the value of a single unit, and then finding the necessary value by multiplying the single unit value.

8 laughs = 3 guffaw

1 guffaw = 8÷3 laughs

2 guffaw = (8÷3)×2 laughs

6 giggles = 1 laugh

(8÷3)×2 laughs = (8÷3)×2×6 giggles

3 snickers = 2 giggles

1 giggles = 3÷2 snickers

(8÷3)×2×6 giggles = (8÷3)×2×6×(3÷2) snickers

=48 snickers

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Answer:

Batteries hold chemical energy

Explanation:

The battery acid in a battery leads to chemical energy.

The statement that "The volume of a gas sample mostly consists of empty space between the moving gas particles" is one of the assumptions of the Kinetic Molecular Theory regarding gases.

What is Collision?

There are different types of collisions, depending on the nature of the objects involved, the speed and direction of their motion, and the type of contact that occurs. For example, elastic collisions are those in which the total kinetic energy of the colliding objects is conserved, meaning that no energy is lost or gained during the collision. In contrast, inelastic collisions are those in which some of the kinetic energy is transformed into other forms of energy, such as heat or sound.

The Kinetic Molecular Theory is a model that describes the behavior of gases. One of the main assumptions of this theory is that gas particles are in constant random motion and move in a straight line until they collide with other particles or the walls of their container.

Another important assumption of this theory is that the volume of a gas sample mostly consists of empty space between the moving gas particles. This means that gas particles are assumed to be very small compared to the overall volume of the gas sample. Therefore, the particles do not occupy all of the available space in the container, but instead only occupy a small portion of it.

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The first transition element is Scandium with the electronic configuration [Ar] 3d1 4s2.

The atomic number of Scandium is 21.

Scandium has two valence electrons in its electronic configuration using KLMN, which are located in the 4s orbital.

The transition elements, also known as transition metals, have unique properties such as high melting and boiling points, good conductivity, and the ability to form colored compounds. They are also used in various industries, such as electronics, construction, and medicine.

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Answer:

D

Explanation:

In terms of relative energy, gas particles have the most energy, solid particles have the least energy and liquid particles are somewhere in between.

Answer:

Because You never know when a meteor will hit you.

Answer:

78.7

Explanation:

The number has 4 significant figures: 7,8 6 and 5.

To round off to 3 significant figures, the target digit is the third significant figure in the number.The determining digit is the fourth significant figure in the number; it is 5 hence the target digit will go up by 1 and any digits to the right of it will be rounded down to 0.

Using CH3NH2 and CH3NH3Cl, one may simulate the blood's buffering properties. A weak acid and its conjugate base, or a weak base and its conjugate acid, make up a buffer system.

Carbonic acid and sodium bicarbonate. Hint: Human blood has a buffer of bicarbonate anion (HCO3) and carbonic acid (H2CO3) to keep the blood's pH between 7.35 and 7.45. Blood pH values higher or lower than 7.8 or 6.8 can be fatal.

Bicarbonate anion and hydronium are in equilibrium with carbonic acid in this buffer. A weak acid and its conjugate base, or a weak base and its conjugate acid, make up a buffer.

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Answer:

CH3NH2 and CH3NH3Cl

Explanation:

Methylamine (CH3NH2) is an organic base. In order to produce a basic buffer solution similar to blood, we can combine this base with a soluble salt of its conjugate acid, such as CH3NH3Cl. The solution of KOH and H2O would not be a good buffer because KOH is a strong base. The solution of HF and NaF is a buffer, but the pKa of HF is about 3.2, which is far from the pH of blood, 7.4.

Answer:

False

Explanation:

This isn't true. Energy is neither created nor destroyed. Heating something makes the particles move faster, but no new energy is created. Cooling results in slower particles, but once again, no energy loss.

The given statement "when something heats up, new energy is created, and when something cools down, energy is destroyed" is absolutely false.

According to the first law of thermodynamics which states that the energy of a closed system must always remain constant. It can neither be created nor destroyed without any interference from outside. This is the principle of physics.

The same concept is described by chemistry through the name known as The law of conservation of energy. This states that in a chemical reaction energy can never be created or destroyed.

When you heat up something, the movement of particle increase, not energy. Similarly, when you cool down something, the movement of particles or atoms within that decreases, not energy.

Therefore, the given statement "when something heats up, new energy is created, and when something cools down, energy is destroyed" is absolutely false.

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Answer: The size of actual bed is 75 inches

Explanation: Scale refers to the ratio of the original dimension to the dimension on paper (miniaturised dimension). Since it is a ratio, it has no dimension.

Scale= original dimension/miniaturised dimension

Given that scale is 1:25

It means that every 1 inch on paper would correspond to 25 inches in reality.

The length of the model bed= 3 inches

Hence, the length of the original bed is 25*3 = 75 inches

Chlorofluorocarbons (CFCs) are man-made chemicals containing chlorine and fluorine that cause ozone molecules to break down. Thus, option B is the answer.

Chlorofluorocarbons are non-toxic, synthetic compounds that contain atoms of Chlorine, Fluorine and Carbon. They are commonly used in the manufacture of aerosol sprays and are also used as solvents and refrigerants. CFCs were first introduced in 1928 by General Motors Company for its refrigerators.

While CFCs are very safe to use in most applications and are stable in the lower atmosphere, these chemicals when released to the upper atmosphere can cause significant reactions. CFCs when released into the upper atmosphere can lead to the destruction of the ozone molecules followed by the release of the UV radiation into the atmosphere.

Thus, CFCs are man-made chemicals which cause ozone molecules to break down.

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The statement describes the advantage of this model of the solar system is  that The students can infer information about the effects of gravity on each planet. Option D

The solar system is composed of the sun and the planets. It has to do with a set up in which the sun lies at the center. We call this the heliocentric model of the solar system.

Given that we have taken the school to be the sun which lies at the center of the solar system and the position of the planets have been scaled using 1 AU = 100 meters (the length of a football field).

The only thing that is given in the options that we can not infer from this set up is the fact that; the students can infer information about the effects of gravity on each planet.

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The percentage atom economy is 62%

2NH3 + H₂SO4 → (NH4)2SO4

34 gram 98 gram 210 gram

2 mol 1 mol 1 mol

% atom economy = mass of atoms in desired product/total mass of atom in Product x 100

% atom economy = 132/210 x 100 = 0.62 = 62%

The amount of desirable useful products produced from reactants is measured by atom economy, also known as atom efficiency. It is frequently expressed as a percentage and is referred to as percentage atom economy. The required product atoms are divided by the total number of reactants, which is equal to the total number of product atoms, to determine the percent atom economy

Higher atom economy reactions provide more of the desired product while producing less waste.

The following stages can be used as a generic method to compute the atom economy:

Determine the atom economy percentage.

Hence, percentage atom economy is 62%

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Answer:

B

Explanation:

The solubility depends on the ksp. As the value of ksp increases the compound becomes more and more soluble.

In the options, the highest ksp value is 10^-10, thus that one is the most soluble.

The sun is a star.

If you were talking about that

the sun is a Star...............

Answer:1.4652

Explanation:

0.74g/ml

0.74x1.98

=1.4652

Answer:

17.86mL of the HCl solution

Explanation:

The reaction of CaCO₃ with HCl is:

CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O

The concentration of HCl with a pH of 1.52 is:

pH = 1.52 = -log [H⁺]

[H⁺] = 0.0302M = [HCl]

27.0mg = 0.0270g of CaCO₃ (Molar mass: 100.09g/mol) are:

0.0270g of CaCO₃ ₓ (1mol / 100.09g) = 2.70x10⁻⁴ moles of CaCO₃

Moles of HCl to react completely with these moles of CaCO₃ are:

2.70x10⁻⁴ moles of CaCO₃ ₓ (2 mol HCl / 1 mol CaCO₃) =

5.40x10⁻⁴ moles of HCl

As the concentration of HCl is 0.0302M, volume in 5.40x10⁻⁴ moles is:

5.40x10⁻⁴ moles of HCl * (1L / 0.0302mol) = 0.01786L =

The volume in milliliters (mL) of an HCl solution with a pH of 1.52 that can be neutralized by the given CaCO₃ is 17.87 mL

From the question,

We are to determine the volume of HCl that could be neutralized by the given CaCO₃

First, we will write the balanced chemical equation for the reaction

The balanced chemical equation for the reaction is

2HCl + CaCO₃ → CaCl₂ + CO₂ + H₂O

This means

2 moles of HCl is required to neutralize 1 mole of CaCO₃

Now, we will determine the number of moles of CaCO₃ present

Mass of CaCO₃ = 27.0 mg = 0.027 g

Using the formula

\(Number\ of\ moles = \frac{Mass}{Molar\ mass}\)

Molar mass of CaCO₃ = 100.0869 g/mol

∴ Number of moles of CaCO₃ present = \(\frac{0.027}{100.0869}\)

Number of moles of CaCO₃ present = 0.00026977 mole

Since

2 moles of HCl is required to neutralize 1 mole of CaCO₃

Then,

0.00053954 mole of HCl will be required to neutralize the 0.00026977 mole of CaCO₃

∴ 0.00053954 mole of HCl is required to neutralize the CaCO₃

Now, for the volume of HCl solution with a pH of 1.52 required

First,

We will determine the concentration of the HCl

From the given information

pH of the HCl = 1.52

Using the formula

pH = -log[H⁺]

Then,

1.52 = -log[H⁺]

∴ [H⁺] = 10^(-1.52)

[H⁺] = 0.0302 M

∴ The concentration of the HCl is 0.0302 M

Now, for the volume

Using the formula,

\(Volume = \frac{Number\ of\ moles}{Concentration}\)

∴ Volume of HCl required = \(\frac{0.00053954}{0.0302}\)

Volume of HCl required = 0.01787 L

Volume of HCl required = 17.87 mL

Hence, the volume in milliliters (mL) of an HCl solution with a pH of 1.52 that can be neutralized by the given CaCO₃ is 17.87 mL

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Answer:

The reactants are the first two before the arrow and the products are the last two after the arrow, it is not balanced it would look like this if it was balanced:

2Na+MgF2–>2NaF+2Mg

Answer:

cornea,Jens and pupil

tma Po yan

Answer:

273.15 Kelvins

Explanation:

Approximately 194.0 grams of glucose (C6H12O6) would be required to prepare a 5000 mL solution with a concentration of 0.215 M.

To determine the mass of glucose (C6H12O6) required to prepare a 0.215 M solution in 5000 mL, we need to use the formula:

Molarity (M) = moles of solute / volume of solution (in liters)

First, let's convert the volume of the solution from milliliters (mL) to liters (L):

5000 mL = 5000/1000 = 5 L

Now, we can rearrange the formula to solve for moles of solute:

moles of solute = Molarity (M) x volume of solution (L)

moles of solute = 0.215 M x 5 Lmoles of solute = 1.075 mol

Since glucose (C6H12O6) has a molar mass of approximately 180.16 g/mol, we can calculate the mass of glucose using the equation:

mass of solute = moles of solute x molar mass of solute

mass of glucose = 1.075 mol x 180.16 g/mol

mass of glucose = 194.0 g (rounded to three significant figures)

Therefore, approximately 194.0 grams of glucose (C6H12O6) would be required to prepare a 5000 mL solution with a concentration of 0.215 M. It's important to note that the molar mass of glucose used in this calculation may vary slightly depending on the level of precision required.

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The electronic configuration of lithium is 1 s² 2s¹ as it  has 1 electron in 2 s subshell it is a s-block element.

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

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Answer:

1000ml=1l

35ml. = ?

Explanation:

35×1/1000

0.035litres

Since there is a larger difference in electronegativity between hydrogen and chlorine than between hydrogen and iodine, hydrochloric acid is more polar than hydroiodic acid.

A polar substance is HCl. This occurs because the more electronegative Chlorine (Cl) atom in the HCl molecule does not evenly share the bonding electrons with the hydrogen atom. (H). However, owing to the molecules' two atoms' similar electronegativity, H2 and Cl2 are not polar.

Because chlorine is more electronegative than hydrogen, it draws the bonded electron pair closer to it and acquires a partial negative charge, whereas hydrogen acquires a partial positive charge, making chlorine (hydrochloric acid) a polar molecule.

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