2zns(s)+3o2(g)—>2zno(s)+2so2(g)

Answer: Formation of a new gas

Formation of a precipitate

A new smell is given off

Heat is released

Explanation: A chemical reaction exhibits the following characteristics: formation of new substance, heat emission is an exothermic process which is due to chemical reactions

Precipitate formation occurs when insoluble substances are formed in an ionic compound solution.

And smells or odor are caused by the production of new substances.

A molecule of a compound is composed of at least two types of atoms.

Explanation:

A molecule is defined as when two or more atoms of an element combine together by the bonds by sharing the electrons as O^2 (oxygen molecule)

A compound is a molecule when two different types of atom joined by chemical bonds as covalent, ionic or coordinate bonds as NH^3 ( ammonia)

Answer:

C- A molecule of a compound is composed of at least two types of atoms

Explanation:

just did the quiz

Answer:

even though I am missing the question I believe that the correct answer to the question is; his cats will be brown (Dominant)

Explanation:

this statement is true to the fact that on of his cats has the homozygous dominant gene BB. For their to be a chance of a white cat as an offspring both cats would either have to be Hetrozygous (Bb) or Homozygous recesssive (bb)

Answer:A. Negative B. Positive C. Neutral or 0

Explanation: Electrons carries a negative charge and protons are apositively charge subatomic particles. Neutrons exhibits a neutral or 0 charge.

Answer:

Molecular oxygen and Hydrogen fluoride.

Explanation:

Definition:

Hydrogen bonding:

It is a type of dipole-dipole attraction between the hydrogen atom and more electronegative atoms.

In hydrogen bonding mostly the highly electronegative atoms are fluorine, nitrogen and oxygen.

Explanation:

In given compound such as methane CH₄ the electronegativity of carbon is 2.55 while that of hydrogen is 2.2 so there is smaller electronegativity difference that's why it can not form hydrogen bond.

In case of molecular oxygen the electronegativite atom oxygen is present. It can form hydrogen bonds with water. its electronegativity is 3.44.

In case of hydrogen fluoride the electronegativity atom fluorine is present. It will form hydrogen bonds with water. Its electronegativity is 3.98. So it is more likely to take part in hydrogen bonding.

Answer:

molecules P4O10 = 2.546 E22 molecules

Explanation:

∴ mass P4O10 = 12 g

∴ mm P4O10 = 283.886 g/mol

⇒ mol P4O10 = (12 g)×( mol/283.886 g) = 0.0423 mol P4O10

⇒ molecules P4O10 = (0.0423 mol P4O10)×(6.022 E23 molecules/mol)

⇒ molecules P4O10 = 2.546 E22 molecules

Answer:anions with least precipitates are anions of salt produce by a strong acid and strong base e.g KCL,Na2SO4,

Explanation: salts produce from strong acid such as HCL and a strong base such as KOH are extremely soluble and hence produce little or no precipitate when dissolved in water .meaning the salt are highly soluble , most group1 elements form salts that are highly soluble and hardly precipitates e.g Na(sodium) pottasium(K) ,lithium(Li)salts.they are called alkaline metals.

B) exception to the rules are hydrogen and Rubidium.hydrogen because it occurs basically as a gas and forms H^+ which tend to form a hydrogen bond while rubidium is a heavy metal forming insoluble salt

Without additional context, it is difficult to determine which supernatural element is emphasized. In literature, each element typically has a distinct significance that contributes to the plot's development.

To ascertain which supernatural element is emphasized, we need additional context from the text or material being discussed. Generally, in literature, supernatural elements like ghosts, prophecies, goblins, and angels serve to create a sense of mystery or to advance the plot. Each element has its own typical significance: a ghost might represent unresolved issues from the past, a prophecy could foreshadow future events, a goblin often adds a touch of mischief or terror, and an angel could symbolize guidance or protection.

Answer:

It would be A, B, and C.

Explanation: This is because radio waves are the longest and gamma rays are the shortest wavelengths. Visible light is in between infrared and ultraviolet rays.

Answer:

Mass = 27.4 g

Explanation:

Given data:

Mass of sulfur = 15.7 g

Mass of iron = ?

Solution:

Chemical equation:

Fe + S →  FeS

Number of moles of sulfur:

Number of moles = 15.7 g/32 g/mol

Number of moles = 0.49 mol

Now we will compare the moles of sulfur with iron

                  S         :        Fe

                  1          :         1

               0.49      :         0.49

Mass of iron:

Mass = number of moles  × molar mass

Mass = 0.49 mol× 55.85 g/mol

Mass = 27.4 g

Answer:

                     Mass of K₂SO₄  =  12.633 g

Explanation:

                    The balance chemical equation for given reaction is as;

                                     CaSO₄ + 2 K = K₂SO₄ + Ca

To solve this reaction one should first find the limiting reagent. To do so e will calculate the moles of each reactant as,

Moles of CaSO₄  =  Given Mass / M.Mass of CaSO₄

Moles of CaSO₄  =  9.87 g / 136.14 g/mol

Moles of CaSO₄  =  0.0725 moles

Similarly for K,

Moles of K  =  Given Mass / A.Mass of K

Moles of K  =  12.05 g / 39.10 g/mol

Moles of K  =  0.308 moles

Now, according to equation,

             1 mole of CaSO₄ reacts with  =  2 moles of K

So,

         0.0725 moles of CaSO₄ will react with  =  X moles of K

Solving for X,

                     X  =  0.0725 moles × 2 moles / 1 mole

                      X  =  0.145 moles of K

As calculated above, we are provided with 0.308 moles of K while, we require only 0.145 moles of it so it means that K is in excess and CaSO₄ is the limiting reagent hence, CaSO₄ will control the yield of K₂SO₄.

So,

The amount of K₂SO₄ produced is calculated by first finding its moles as,

According to equation,

             1 mole of CaSO₄ produced  =  1 mole of K₂SO₄

So,

         0.0725 moles of CaSO₄ will produce  =  X moles of K₂SO₄

Solving for X,

                     X  =  0.0725 moles × 1 mole / 1 mole

                      X  =  0.0725 moles of K₂SO₄

Now convert moles of K₂SO₄ to mass as,

Mass of K₂SO₄  =  Moles × M.Mass

Mass of K₂SO₄  =  0.0725 × 174.26 g/mol

Mass of K₂SO₄  =  12.633 g

Final answer:

The first step of the scientific method is to make observations. Through observations, scientists gather information about a natural phenomenon or problem that they want to investigate.

Explanation:

The first step of the scientific method is to make observations. Through observations, scientists gather information about a natural phenomenon or problem that they want to investigate.

For example, a student arrives at class and notices that the classroom is too warm. This observation leads to a question, 'Why is the classroom so warm?'

By making careful observations, scientists can then proceed to form a hypothesis, which is the next step of the scientific method.

Option B

Primary productivity is not limited by time

Explanation:

To ecosystems, the productivity of the primary producers is essential because certain bodies generate energy for different existence bodies. Besides the era, primary production ends in the extension of dissimilar plant biomass to the practice. Consumers acquire their strength from primary producers, unless directly (herbivores, any detritivores), or diffusely.

It depends superimposed on the availability of the sunlight, availability of the nutrients such as nitrogen, iron, phosphorus from the soil and water. The primary productivity of the plant's distinct autotrophs is not restricted by time.

Answer:

its b i did the test

Explanation:

It shows how many atoms are in a element

A chemical formula shows you what a substance was made from. So like what elements are in it, and how many atoms of each element are in it.

For example: H20 has 2 atoms of hydrogen and 1 atom of oxygen.

Happy to help! :)

Answer:

Three chlorine ions

Explanation:

Answer:

Animal cell lacks chloroplasts and a cell wall

Explanation:

Unlike animal cells, plant cells have chloroplasts and a cell wall. In a plant cell, the chloroplasts work to use photosynthesis in order to turn light into energy for the plant cell. Animal cells do not utilize light energy, and therefore do not carry out photosynthesis and do not have chloroplasts.

Additionally, the plant cell has a protective cell wall and a cell membrane, while animal cells only have a cell membrane. This is because the plant cells' cell wall provides additional strength and protection against outside factors, such as osmosis.

Both plant and animal cells have nuclei and cytoplasm, but plant cells have additional structures like cell walls, chloroplasts, and a large central vacuole. Animal cells lack these structures.

Plant cells and animal cells have both similarities and differences. Both types of cells have nuclei and cytoplasm. However, plant cells have cell walls and chloroplasts, which allow for photosynthesis, while animal cells do not have these structures. Additionally, plant cells have a large central vacuole, plastids, and plasmodesmata, which are not found in animal cells.

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Answer:

c.

Explanation:

When the temperature of a gas increases by 4x, its volume will increase according to option A, by 4x as per Charles's law. Thus, correct option is A.

If the pressure of a gas is decreased by 4x, the volume will increase as per option A, by 4x as per Boyle's Law. Thus, correct option is A.

According to the ideal gas law (PV = nRT), when the temperature of a gas is increased, keeping other factors constant, its volume also increases proportionally. This is known as Charles's law. So, if the temperature is increased by 4 times, the volume will increase by 4 times as well.

Similarly, according to Boyle's law, when pressure decreases, volume increases proportionally. So, if the pressure is decreased by 4 times, the volume will increase by 4 times.

Therefore, the correct answers are A for both scenarios.

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Answer: its 3

Explanation:

Answer:

3 has the highest temperature

Explanation:

Just took the test hope this helps. Leave a thanks please

Answer: atomic number Z, gives the proton number of an element and it is unique for all elements ( i.e no two elements have the same atomic number or proton number) if the atom of the element is electrically neutral, the atomic number can also be the electron number

Explanation:

Answer:

A, tho I'm not completely sure.

Maybe this will help (picture)

D orbitals start getting filled after the s orbital of the next highest energy level. This is due to the Aufbau principle which mandates that orbitals are filled in order of increasing energy levels. Even if 4s has a higher quantum number than 3d, it gets filled first due to its lower energy.

In atomic structure, d orbitals start getting filled after the s orbital of the next highest energy level. Each energy level in an atom has different types of orbitals - s, p, d, and f. The filling of these orbitals follows the Aufbau principle which means 'building up' in German. This principle essentially mandates that electrons fill up orbitals in order to increase energy levels.

The order of filling starts with the 1s orbital, then 2s, 2p, 3s, 3p, 4s and then the 3d orbitals. Thus, before the d orbitals start getting filled up, the s orbital of the next higher energy level (4s in this case) gets filled. It's important to note that despite 4s having a higher principal quantum number (n=4) than 3d (n=3), 4s has a lower energy and fills up before 3d.

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Answer: Ionic bond

Explanation: Ionic bonding is the transfer of electrons form least electronegative atom to a more electronegative one. Ionic bonds are commonly formed between a metal an electron donor and a non metal an electron acceptor. Since nonmetals have higher ionization energy and electronegativity electrons are transferred to them.

Answer:

Ionic bond

Explanation:

Answer:

it is b

Explanation:

Answer:

Explanation:To convert from cal/(g*C) to J/(kg*K), we just need to find a conversion factor for specific heat. There is really no mathematical way to do this other than to look in a physics or chemistry book and find a conversion factor. After doing this, you will see that 1 cal/(g*C) is equal to 4,186 J/(kg*K).

To find the specific heat of a material, first look at the units. There is energy per unit mass per unit temperature. So if we are given an amount of energy appllied to an object, its mass and how much the temperature of the object rises, we can calculate its specifc heat by dividing the energy by both the mass and the temperature, but don't forget to keep the units as they are:

Specific heat of the metal = (95 cal)/(10 K * 700g) = 0.014 cal/(g*K)

To find how much energy it requires to melt 250 grams of ice, we will need what is called the Latent Heat of Melting for ice. This is the amount of heat required to change unit mass of a solid into unit mass of a liquid at a constant temperature. Again, using a reference, the latent heat of melting for ice is found to be 334 kJ/kg. So the energy required to melt one kg of ice is 334 kJ. The amount of energy required to melt 0.250 kg of ice is then:

334 * 0.250 = 83.5 kJ

Answer:

A.  Number of  moles, n = Reacting mass / Molecular mass

                                 n = 72.04/ 196.966

                                 n = 0.366 mole

Hence, the number of moles of gold (Au) in the sample is 0.366 mole

B. the number of atoms of gold (Au) in the sample is expressed as

                                  = 0.366 * 6.03*∧1023

                                   = 2.20698E35 atoms

Explanation:

Answer:

reactivity

Explanation:

Answer:

reactivity is the answer

Explanation:

Answer:1 mole Li2O

Explanation: Solution attached

First balance the given chemical equation

4 Li + O2 => 2 Li2O

The stoichiometric factor of Li and Li2O is 4 moles Li and 2 moles Li2O

Solution:

2 moles Li x 2 moles Li2O / 4 moles Li

= 1 mole Li2O

Explanation:

Answer: D

Explanation:

Answer: 341.15atm

Explanation:Please see attachment for explanation

The new pressure in the cylinder after the temperature increase to 475°C is approximately [tex]\( 341.53 \)[/tex] atm.

The new pressure of the gas cylinder after the temperature increase, we can use the combined gas law, which relates the initial and final states of a gas under changing conditions of temperature and pressure, assuming constant volume.

The combined gas law is given by.

[tex]\[ \frac{P_1 \cdot V_1}{T_1} = \frac{P_2 \cdot V_2}{T_2} \][/tex]

where.

[tex]- \( P_1 \) and \( T_1 \)[/tex] are the initial pressure and temperature.

[tex]- \( P_2 \) and \( T_2 \)[/tex] are the final pressure and temperature.

[tex]- \( V_1 \) and \( V_2 \)[/tex] are the initial and final volumes respectively assuming constant volume here.

Given.

- Initial pressure, [tex]\( P_1 = 135 \)[/tex] [tex]atm[/tex].

- Initial temperature, [tex]\( T_1 = 23 \) °C = \( 23 + 273.15 = 296.15 \)[/tex] K.

- Final temperature, [tex]\( T_2 = 475 \) °C = \( 475 + 273.15 = 748.15 \)[/tex] K.

We need to find [tex]\( P_2 \)[/tex], the final pressure.

First, let's rearrange the combined gas law to solve for [tex]\( P_2 \).[/tex]

[tex]\[ P_2 = \frac{P_1 \cdot T_2}{T_1} \][/tex]

Now, substitute the given values.

[tex]\[ P_2 = \frac{135 \cdot 748.15}{296.15} \][/tex]

Calculate [tex]\( P_2 \).[/tex]

[tex]\[ P_2 = \frac{101135.25}{296.15} \][/tex]

[tex]\[ P_2 \approx 341.53 \, \text{atm} \][/tex]

Answer:

This time, a hot metal spoon is put in room-temperature water.

Explanation:

The faster-moving atoms in the spoon contact the slower-moving molecules in the water. The atoms in the spoon transfer some of their energy to the molecules in the water. The spoon will get cooler and the water will get a little warmer.

Answer:

This time, a hot metal spoon is put in room-temperature water. The faster-moving atoms in the spoon contact the slower-moving molecules in the water. The atoms in the spoon transfer some of their energy to the molecules in the water. The spoon will get cooler and the water will get a little warmer.

Edit: this is what i think

Answer:

1. Potential energy

2. Chemical energy

3. Electromagnetic energy

4. Kinetic energy

Answer:

1) potential energy 2) chemical energy 3) electromagnetic energy 4) kinetic energy

Explanation:

Just completed this question on my assignment. :)