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Answer:

changes can occur to physical properties of a substance, but the chemical composition of the

substance remain the same.

Answer:

Changes can occur to physical properties of a substance, but the chemical composition of the substance remains the same.

Explanation:

I got 100% on edg quiz 2022

Answer:

Explanation:

Polystyrene and acetone are not soluble in water because they are non-polar substances.

A polar substance is a substance that has opposite charges on two ends of the molecule. In polar molecules, a dipole moment exists in the molecule and accounts for its interaction with water.

Water is a polar solvent. It can only dissolve polar molecules. Since polystyrene and acetone are both non-polar substances, polystyrene dissolves in acetone and not in water.

This agrees with the principle in chemistry that like dissolves like.

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Answer:

in my opinion not really

Explanation:

Answer:

I DON'T KNOW

Explanation:

I DON'T KNOW

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Answer:

Cl2 does not have any charge

Explanation:

But when it is present in its ionic form then chlorine have -1 charge on it. But charge on chlorine varies from -1 to +7

Answer:

We can measure volumes approaching absolute zero and then predict what the volume would be at absolute zero.

Since there is NO molecular motion at absolute zero, the volume of a balloon at absolute zero should be zero.

If you headed to the deepest recesses of intergalactic space, shielded from starlight, the only thing that would heat you up would be the Big Bang's leftover glow: the cosmic microwave background at 2olume.ht v725 K.   At that temperature, the balloon would have a volume.

          Charles' Law asserts that a gas's volume (V) and temperature (T), which must be expressed in Kelvin, are directly proportional to one another. A change in temperature of one Kelvin unit corresponds to a change in one Celsius degree. Never forget that the value 0 on the Kelvin scale corresponds to -273 or "Absolute Zero."

          Charles's Law, V = a T+ b, is used to calculate absolute zero once the mass measurements are transformed to high and low temperature gas volumes.

         The volume of an ideal gas would theoretically be 0 at absolute zero, and there would be no more molecular motion. Actually, above this temperature, all gases condense into solids or liquids.

           According to Boyle's Law, gas volume grows as pressure lowers. Charles' Law states that when the temperature rises, the volume of the gas increases.

          Gases compress infinitely as the temperature is lowered because there is a linear relationship between temperature and pressure for the majority of gases (see gas laws). The volume of an ideal gas would theoretically be 0 at absolute zero, and there would be no more molecular motion.  

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The balanced equation for the production of water from hydrogen gas is

2H₂   +   O₂   →    2H₂O

Based on the balanced equation, for every mole of hydrogen, a mole of water is produced.

∴ Since the moles of water = 25 moles

25 moles of H₂ (hydrogen gas) are required to make 25 moles of H₂O.

Stoichiometry is an important concept which helps us use the balanced chemical equation to measures the amount of reactants and products.

The balanced chemical equation is the equation in which the number of atoms on the left hand side that is reactant side is equal to the number of atoms on the right hand side that is product side in an equation.

First we have to write the Balanced chemical equation

2H₂ + O₂ → 2H₂O

To produce 2 moles of water, 2 moles of hydrogen are required to produce 25 moles of water.

According to the Stoichiometry

[tex]\frac{2\ \text{moles of}\ H_2}{2\ \text{moles of}\ H_2O} \times 25\ \text{moles of}\ H_2O[/tex]

= 25 moles of hydrogen gas is required

Thus, from above conclusion we can say that 25 moles of H₂ (hydrogen gas) are required to make 25 moles of H₂O.

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Answer:

a b

Explanation:

I think so take it with a grain of salt

Answer:

transition metal

Explanation:

Answer:

Copper is a Transition metal.

Explanation:

Use the periodic table website! It tells you what kind of metals the elements are and if they are metals or nonmetals.

Website: ptable.com

Since we are starting from the number of atoms of Nickel, we need to know two sets of formulas:

mass = moles × molar mass

moles = atoms ÷ Avogadro's Number

⇒ mass = (atoms ÷ Avogadro's Number) ×  molar mass

   mass = [(7.4 × 10¹⁵ atoms) ÷ (6.022 × 10²³ atoms/mole)] × (58.69 g/mol)

             = 7.21 × 10⁻⁷ g

Cooking materials are made of copper, aluminum, and iron because they contain free, mobile electrons owing to the metallic bond.

Metallic bonding involves a sea of electrons that is bonded to metal cations by electrostatic attraction. The electrons in the metallic bond are free to move around the material.

Because there are free electrons, when the material is heated, the electrons receive energy and move faster, this energy spreads throughout the material by conduction.

Hence, good conductors of heat such as copper, aluminum, and iron are used for cooking materials.

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Answer:

Electrochemistry,

Explanation:

Electrochemistry is a branch of chemistry concerned with the relation between electricity and chemical change. Many spontaneously occurring chemical reactions liberate electrical energy, and some of these reactions are used in batteries and fuel cells to produce electric power.

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Answer:

Electrochemistry, branch of chemistry concerned with the relation between electricity and chemical change. Many spontaneously occurring chemical reactions liberate electrical energy, and some of these reactions are used in batteries and fuel cells to produce electric power.

Answer:

1. Hypnosis can help people stop smoking.(Yes)

To what extent does hypnosis work in regards to these behaviors?

A study by McNeilly and colleagues found that hypnosis may help quitters to focus on their own resources to curb cigarette cravings. Other researchers have suggested that success rates are caused by the relaxation effects of hypnosis. These might allow people to cope with nicotine addiction and nicotine withdrawal.

Would you recommend them? Why or why not?

I wouldn't recommend it because, The evidence for hypnosis as a successful smoking cessation method is a mixed bag. Some studies have seen high success rates, whilst others are more modest. A review of 59 different trials found that hypnosis is often better than no support at all.( so its a risk)

Explanation:

Considering the relationship between volume and temperature, a gas under constant pressure can only have its volume reduced as a result of a decrease in its temperature.

According to Charles law, at constant pressure, the volume of a gas is directly proportional to its absolute temperature. Thus:

V1/T1 = V2/T2 where V1 = intial volume, V2 = final volume, T1 = initial temperature, and T2 = final temperature.

In this case, T1 = 59.0, V1 = 30.57, and V2 = 21.14

T2 = 21.14 x 59/30.57

                 = 20.05 K

It can be seen that the temperature of the gas has reduced from 59.0 K to 20.05K.

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Answer:

Speed = Distance × Time

A× B

Answer:

Niels Bohr

Explanation:

Answer:

A Cation

Explanation:

Answer:

See below

Explanation:

The two plates are called DIVERGENT which means the two plates are moving away from each other.  The separating motion can allow magma to come to the surface creating the mid-ocean ridge.

Explanation:

% phosphorus by mass

            = (mass of phosphorus ÷ mass of phosphoric acid) × 100%

            = (30.974 g/mol ÷ 97.994 g/mol) × 100%

Answer:Reigns then hit two Superman punches and a spear to score the pinfall. Result: Roman Reigns defeated John Cena via pinfall to retain the title.

Explanation:

Answer: Roman Reigns I hope this helps

Explanation:

Eleven matches were contested at the event, including one match on the Kickoff pre-show. In the main event, Roman Reigns defeated John Cena to retain SmackDown's Universal Championship.

Adding ice to the liquid decreases the average kinetic energy of the particles of the liquid.

The temperature of a substance is defined as a measure of the average kinetic energy of the molecules of the substance. The average kinetic energy of the molecules of a substance is directly proportional to the temperature of the substance.

This implies that if I increase the temperature of a substance, the average kinetic energy of the molecules of the substance increases and vice versa.

Ice is at a lower temperature than water at room temperature. Thus, adding ice to water at room temperature decreases the temperature of the water and consequently decreases the average kinetic energy of its particles.

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Answer: 2.0 grams per cubic centimeter

Explanation: i had this

Answer:

I think its electromagnetic spectrum

Answer:

Radiant energy is energy that travels in waves and can travel through space. The sun gives off radiant energy and is important here on earth for many natural processes to occur. The electromagnetic spectrum is the range of all forms of radiant energy from gamma rays to radio waves.

Explanation:

Answer:

Beryllium-8 (8Be, Be-8) is a radionuclide with 4 neutrons and 4 protons. It is an unbound resonance and nominally an isotope of beryllium. It decays into two alpha particles with a half-life on the order of 10−16 seconds; this has important ramifications in stellar nucleosynthesis as it creates a bottleneck in the creation of heavier chemical elements. The properties of 8Be have also led to speculation on the fine tuning of the Universe, and theoretical investigations on cosmological evolution had 8Be been stable.

Explanation:

Answer:

The answer is A Tuberculosis

Answer:

glucose and amino acids

Explanation: