An atom is defined as the smallest part of an element that...?

Answer:

Ca +  CO₃²⁻   → CaCO₃

Explanation:

Solution:

      Sodium carbonate  = Na₂CO₃

      Calcium chloride = CaCl₂

      Calcium carbonate is precipitated

Reaction equation:

           Na₂CO₃  +  CaCl₂  →  CaCO₃ + 2NaCl

The net ionic equation:

        2Na⁺ + CO₃²⁻   + Ca + 2Cl⁻  → CaCO₃ + 2Na⁺ + Cl⁻

the spectator ions which both appears on both sides will cancel out and leave behind the net ionic equation:

              Ca +  CO₃²⁻   → CaCO₃

Answer:

The answer is different for other people so look out.The answer here is C. The metal of the wires must be in contact with the terminals of a battery.

Explanation:

I took the quiz.

The metal of the wire must be in contact with the terminals of a battery so that, electrons can easily pass through and generate the electrical current.

An electrical insulation is used to prevent the passage of electricity through an object. The materials which does not conduct electrically at any condition is called insulators.

Insulators are used as protective envelopes over the conducting bodies to resist the electrical shock and shortage of electricity. The electrical wires of circuits are coated with insulating plastics throughout up to the terminals.

The terminals cannot be insulated because, the passage of electricity to external circuit can only be achieved by conducting ends otherwise insulation will resist the passage of electrons to the battery. Thus, option C is correct.

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Answer:

380 to 700 nanometers

Explanation:

The visible light spectrum is the segment of the electromagnetic spectrum that the human eye can view. More simply, this range of wavelengths is called visible light. Typically, the human eye can detect wavelengths from 380 to 700 nanometers.

Hope that answers your question.

Answer:

Mass of product B  = 15g

Explanation:

Reaction:

          AB →  A   +   B

Mass of AB  = 25g

Mass of A = 10g

Unknown:

Mass of B = ?

Solution:

Based on the law of conservation of matter "matter is neither created nor destroyed but transformed from one form to another in a chemical reaction".

 The amount of product  = amount of reactant

  Mass of AB  = Mass of A + Mass of B

  Now;

    Mass of Product B  = Mass of AB  - Mass of A

     Mass of product B   = 25  - 10  = 15g

Mass of product B  = 15g

Answer:

B.chlorine (Cl), iodine (I)

Answer:

I have been banned before too, it is not fun :(

Explanation:

this is actually my fourth account cause I also had some deleted

Answer:

can't say...... . . please make me as brainlist

Answer: ladadadadadadasasasasassassaasss

Explanation:

i poop my pants

Answer:

The conductivity of the atom depends on the number of electrons that are in the valence shell. When an atom has only one electron in valence shell, it is almost a perfect conductor. When an atom has eight valence electrons the valence shell is said to be complete and the atom is an insulator.

- Spokane.edu

Answer:

violet

Explanation:

When an electron interacts with visible light, energy is transferred from the photon to the electron.

The most accurate (lowest error) measurement of momentum (or speed) of an electron is obtained using a photon of high energy and low wavelength.

Violet light which lies at the high energy end of spectrum is most suitable.

Answer:

14.2g

Explanation:

The reaction expression is given as:

        C₃H₈  +  5O₂ → 3CO₂ + 4H₂O

Given mass of propane combusted;

   4.74g

Unknown:

Mass of carbon dioxide produced  = ?

Solution:

To solve this problem, we find the number of moles of the given propane;

   Number of moles  = [tex]\frac{mass}{molar mass}[/tex]  

Molar mass of C₃H₈ = 3(12) + 8(1) = 44g/mol

   Number of moles  = [tex]\frac{4.74}{44}[/tex]  = 0.11mol

From the balanced reaction equation:

          1 mole of C₃H₈ will produce  3 moles of CO₂

          0.11mole of C₃H₈ will produce 3 x 0.11  = 0.33mole of  CO₂

Mass of  CO₂ = number of moles x molar mass

    Molar mass of  CO₂ = 12 + 2(16) = 44g/mol

Mass of  CO₂ = 0.33 x 44  = 14.2g

Answer:

(c) P and Sb

Explanation:

We can determine the number of valence electrons of an element:

Which pair of elements have the same valence electronic configuration of np³?

(a) O and Se. NO. They belong to the group 16 and the valence electron configuration is ns² np⁴.

(b) Ge and Pb. NO. They belong to the group 14 and the valence electron configuration is ns² np².

(c) P and Sb. YES. They belong to the group 15 and the valence electron configuration is ns² np³.

(d) K and Mg. NO. They belong to the groups 1 and 2 and the valence electron configuration is ns¹ and ns².

(e) Al and Ga. NO. They belong to the group 13 and the valence electron configuration is ns² np¹.

The pairs of elements that contain the similar valence electronic should be option (c) P and Sb

In the case when it belongs to Groups 1 and 2, the no of valence electrons should be equivalent to the number of groups and the differential electron occupies the s subshell. On the other hand, in the case when it belongs to the groups 13-18, the number of valence electrons should be equivalent to "Number of group - 10" and the differential electron occupies the p subshell.

This question is incomplete. Please find the completed question below.

Which pair of elements have the same valence electronic configuration of np³?

(a) O and Se. NO. They belong to the group 16 and the valence electron configuration is ns² np⁴.

(b) Ge and Pb. NO. They belong to the group 14 and the valence electron configuration is ns² np².

(c) P and Sb. YES. They belong to the group 15 and the valence electron configuration is ns² np³.

(d) K and Mg. NO. They belong to the groups 1 and 2 and the valence electron configuration is ns¹ and ns².

(e) Al and Ga. NO. They belong to the group 13 and the valence electron configuration is ns² np¹.

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Answer:

b. increases, decreases

Explanation:

For an ionic compound ( ionic crystal), the lattice energy accounts for the crystal lattice's cohesion energy.

The lattice energy is the change in molar enthalpy associated with the reaction of the formation of gas ions from a mole of crystal.

This means that the lattice energy is needed to split the bond between particles of a solid ionic crystal and change the atoms into gaseous ions.

The smaller the atom size, the more heat energy required to split the bond, and the larger the atom size, the lesser heat required.

The charge on the atom also affects the behavior of ionic crystals. In essence, the higher the charge on the atom, the more difficult to split the bond, and the lesser the charge on an atom, the easier it is to split the bond.

Thus, we can conclude that the lattice energy for ionic crystals increases as the ions' charge increases, and the size of the ions decreases.

Answer:

I think both photosynthesis and cellular respiration breaks down glucose

Explanation:

sorry if i'm wrong

Answer:

c

Explanation:

both photosynthesis and cellular respiration brakes down glucoso

Answer:

b only

Explanation:

Answer:The ice will melt

Explanation:

Answer:

Br

Explanation:

Answer:

A material that readily transmits energy is a conductor, while one that resist energy transfer is called an insulator. There are different types of conductors and insulators because there are different forms of energy. Materials that conduct electrons, protons, or ions are electrical conductors. They conduct electricity. Usually, electrical conductors have loosely bound electrons. Materials that conduct heat are thermal conductors. Substances that transfer sound are acoustical conductors. There are corresponding insulators for each type of conductor.

Explanation:

Electrical conductors and thermal conductors have loosely bound electrons. These are the materials that conduct heat.

Electrical conductivity is a measure of how well electrical current can pass through a material under the influence of an applied electric field. Thermal conductivity measures how well heat can pass through a material under a temperature difference. Materials that are good conductors of heat and electricity. Thermal insulators do not transfer energy, but thermal conductors do.

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Answer:

The correct option is B

Explanation:

One of the claims of John Dalton's atomic theory is that atom is the smallest unit of matter (which suggests that there are no particles smaller than an atom in any matter). This claim has been disproved by the modern atomic theory which established that there are particles smaller than atom (called subatomic particles). These particles are electrons, protons and neutrons.

One of the modern atomic theory was by Neils Bohr, who proposed that electrons move in circular orbits around the central nucleus. Thus, the electrons of iron can also be said to be present in a region of space (circular path) around the nucleus. This proves that option B is the correct option as John Dalton's theory did not even recognize the electron(s) nor the nucleus.

Answer:

b

Explanation:

Answer:  Thermal Power Plant  1.  A thermal power station is a power station in which heat energy is converted to electric power. In most, a steam-driven turbine converts heat to mechanical power as an intermediate to electrical power. Water is heated, turns into steam and drives a steam turbine which drives an electrical generator.

Nuclear Power Plant  2.   A nuclear power plant is a thermal power station in which the heat source is a nuclear reactor. As is typical of thermal power stations, heat is used to generate steam that drives a steam turbine connected to a generator that produces electricity.

Solar Power Plant   3.    Solar thermal power/electric generation systems collect and concentrate sunlight to produce the high temperature heat needed to generate electricity. ... Solar thermal power plants may also be hybrid systems that use other fuels (usually natural gas) to supplement energy from the sun during periods of low solar radiation.

Hydroelectric Power Plant   4. The most common type of hydroelectric power plant is an impoundment facility. An impoundment facility, typically a large hydropower system, uses a dam to store river water in a reservoir. Water released from the reservoir flows through a turbine, spinning it, which in turn activates a generator to produce electricity.

Geothermal Power Plant   5.   At a geothermal power plant, wells are drilled 1 or 2 miles deep into the Earth to pump steam or hot water to the surface. ... When the water reaches the surface, the pressure is dropped, which causes the water to turn into steam. The steam spins a turbine, which is connected to a generator that produces electricity.

Tidal Power Plant   6.   There are very few commercial-sized tidal power plants operating in the world. The first was located in La Rance, France. The largest facility is the Sihwa Lake Tidal Power Station in South Korea. The United States has no tidal plants and only a few sites where tidal energy could be produced at a reasonable price.

Wind Farm   7.    Wind turbines work on a simple principle: instead of using electricity to make wind—like a fan—wind turbines use wind to make electricity. Wind turns the propeller-like blades of a turbine around a rotor, which spins a generator, which creates electricity.

Explanation:

To solve this we must be knowing each and every concept related to  thermal power plant. Therefore, in the below given ways, three ways of producing electricity is discussed.

A power plant that converts heat energy into electric power is known as a thermal power station. Most often, a steam-driven turbine turns heat into mechanical power as a step toward creating electricity.

Systems for generating electricity using solar thermal energy collect and start concentrating sunlight to create the high-temperature heat required to produce electricity.

An impoundment facility is the kind of hydroelectric plant that is most prevalent. A dam is used in an impoundment facility, which is usually a big hydroelectric system, to hold stream water in a reservoir.

Therefore, in the above given ways, three ways of producing electricity is discussed.

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Answer:

c. carnivore means to eat meat

Answer:

c. they eat meat

Explanation:

while the other options are true those don't classify spiders as carnivores

Answer:

Calculate the energy of a photon having a wavelength of 7.71 x 10^-5 m.​

Explanation:

Answer:

c

Explanation:

its c bcs they are both the same

The compound : C₄₀H₄₄N₄O

The empirical formula is the smallest comparison of atoms of compound =mole ratio of the components

The principle of determining empirical formula

• Determine the mass ratio of the constituent elements of the compound.  

• Determine the mole ratio by dividing the percentage by the atomic mass

The mol ratio of composition : C : H : N : O

[tex]\tt \dfrac{80.66}{12}\div \dfrac{7.39}{1}\div \dfrac{9.39}{14}\div \dfrac{2.68}{16}\\\\6.722\div 7.39\div 0.671\div 0.1675\rightarrow divide~by~smallest(0.1675)\\\\40\div 44\div 4\div 1[/tex]

Answer:

If we assume that there will be enough Hydrogen for the reaction to occur, then there will be 8 moles of NH

Explanation:

The balanced equation will look like this:

4N2 + 4H2 -> 8NH

Complementary Base Pairing. Specific pairs can only go together, so when guanine and adenine pair up, its Complementry Base Pairing :)

Hope this helps! Please correct me if im wrong :)