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Answer: C

Explanation:

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Answer:

2HCl - H2 + Cl2

Explanation:

The two hydrochloric acid molecules decompose into one hydrogen molecule (H2) and one chlorine molecule (Cl2). If there is only one type of a specific molecule present, you should not have to add a coefficient of 1 behind it.

Answer:

Molecular geometry, also known as the molecular structure, is the three-dimensional structure or arrangement of atoms in a molecule. Understanding the molecular structure of a compound can help determine the polarity, reactivity, phase of matter, color, magnetism, as well as the biological activity.

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Answer: In this compound, phosphorous and oxygen act together as one charged particle, which is connected to magnesium, the other charged particle.

Explanation:

Answer:

1569.5g

Explanation:

Given parameters:

Number of molecules   = 2.56 x 10²⁵

Unknown:

Mass of HCl  = ?

Solution:

To solve this problem, let us find the number of moles first;

      Number of moles  = [tex]\frac{number of particles}{2.56 x 10^{25} }[/tex]  

 So,

    Number of moles  = [tex]\frac{2.56 x 10^{25} }{6.02 x 10^{23} }[/tex]   = 0.43 x 10²  = 43mol

Now;

 Mass of HCl  = number  of moles x molar mass

           Molar mass of HCl   = 1 + 35.5 = 36.5g/mol

   Mass of HCl  = 43 x 36.5  = 1569.5g

This is the difference between a homogeneous and a heterogeneous mixture.

For example, salt (NaCl) and water make a homogeneous mixture (the same proportions of its components throughout any given sample), because both substances are polar.

A solution is homogeneous mixture composed of two or more substances.

In aqueous solution, a solvent is water and solute (in this example sodium chloride) is a substance dissolved in water.

A heterogeneous mixture is not uniform in composition (in this mixture different metals and minerals), but proportions of its components (for example mixture particles of different colors, small pebbles) vary throughout the sample.

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The correct match of each term with its definition is as follows:

The sun is a star that the Earth revolves around and from which it receives light and warmth. The parts in the sun are as follows:

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Answer:

Chromosphere = C) Layer of the sun that is known for its red color and can only be seen during eclipses.

Convective zone = B) Layer of the sun where energy is transferred by convection.

Core = A) The central and hottest section of the sun.

Radiative zon = D) Layer of the sun where energy is transferred by thermal conduction.

Explanation:

I got right on test!

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Answer:

A Pure substance cant be broken down in any way. Nitrogen cant be broken down any further

Explanation:

Air is a mixture of gasses

Juice and be reduced to sugars

Tap water can be boiled into vapor

Answer: Air nitrogen. Elements and compounds are the two types of pure substances. Examples of common elements include carbon, nitrogen and hydrogen. They consist of one type of atom and cannot break down into something else. ... Compounds such as water, salt and sugar are also pure substances.

Explanation:

Answer:

The valency does not change going down a group since the bonding behavior is not affected by the core electrons.

Answer:

True

Explanation:

Two liquids of a mixture having the same boiling point cannot be separated using the process of distillation.

Distillation is one of the process of physical separation techniques.

So without a difference in the boiling point of the compound that makes up a mixture, the separation by distillation will not be possible.

Answer:

490. g H₂SO₄

General Formulas and Concepts:

Chemistry - Atomic Structure

Explanation:

Step 1: Define

3.01 × 10²⁴ molecules H₂SO₄

Step 2: Identify Conversions

Avogadro's Number

Molar Mass of H - 1.01 g/mol

Molar Mass of S - 32.07 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of H₂SO₄ - 2(1.01) + 32.07 + 4(16.00) = 98.09 g/mol

Step 3: Convert

[tex]3.01 \cdot 10^{24} \ molecules \ H_2SO_4(\frac{1 \ mol \ H_2SO_4}{6.022 \cdot 10^{23} \ molecules \ H_2SO_4} )(\frac{98.09 \ g \ H_2SO_4}{1 \ mol \ H_2SO_4} )[/tex] = 490.287 g H₂SO₄

Step 4: Check

We are given 3 sig figs. Follow sig fig rules and round.

490.287 g H₂SO₄ ≈ 490. g H₂SO₄

Explanation:

Chlorine is an element in group 7 on the periodic table.

  It is the second element in this group of halogens

 The element has a total of 17 electrons:

Ground state configuration  = 1s² 2s² 2p⁶ 3s² 3p⁵

Valence electrons are the outermost shell electrons;

  From the configuration: 3s² 3p⁵ is the valence shell

           Number of electrons  = 2 + 5  = 7

Answer:

quantitative

Explanation:

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Explanation:

Robins are born in the spring or summer and are mature birds and ready to breed in the following spring or summer. They do not mate for life. Pairs usually remain together during an entire breeding season, which can involve two or three nestings.

Since leaving the nest (fledging), it takes another 10-15 days for babies to become good fliers and individual birds. The parents continue to feed their young throughout this time.

Answer:

The baby`s reflex to grab is an innate behavior.

It`s not B because if the baby is 1 day old it`s not going to 'remember'.

It`s not C because it hasn`t really 'learned' anything.

It`s not D because babies can`t sense heat like a snake or something. -_-

Hope that helps

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The statement which statement best describes why the baby grasps Beth’s finger is that it is a reflex to grab is an innate behavior.

In biology, a reflex, or reflex action, is an involuntary, unplanned sequence or action and nearly instantaneous response to a stimulus.

The simplest reflex is initiated by a stimulus, which activates an afferent nerve. The signal is then passed to a response neuron, which generates a response.

Reflexes are found with varying levels of complexity in organisms with a nervous system. A reflex occurs via neural pathways in the nervous system called reflex arcs. A stimulus initiates a neural signal, which is carried to a synapse. The signal is then transferred across the synapse to a motor neuron, which evokes a target response. These neural signals do not always travel to the brain,so many reflexes are an automatic response to a stimulus that does not receive or need conscious thought.

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The investigation designs that explain the heat transfer when atoms directly touch have been the hand touching the handle of the pan sitting on the lit bunsen burner. Thus, option D is correct.

Heat has been the energy that can neither be created nor destroyed. The heat energy can be transferred from one body to another with the transfer of atomic energy.

The atoms of an object gaining energy start to vibrate and transfer the energy to another atom that is in close proximity to the vibrating atoms.

The boiling of water in a pan by sitting it onto the bunsen burner has been an example of the transfer of heat energy. The heat energy of the burner has been transferred to the atoms of the pan that resulting in the boiling of the water in the pan. It has been the transfer of energy in an object.

By touching the pan, the energy of the pan has been transferred to the body. Thus the transfer of energy takes place between two different objects.

Thus, the example of heat transfer between two different objects has been the transfer of energy from the bunsen burner to the pan, and from touching the pan by hands, the energy has been transferred to the hands, Thus, option D is correct.

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The number of liters of 3.00 M lead (II) iodide : 0.277 L

Reaction(balanced)

Pb(NO₃)₂(aq) + 2KI(aq) → 2KNO₃(aq) + PbI₂(s)

moles of KI = 1.66

From the equation, mol ratio of KI : PbI₂ = 2 : 1, so mol PbI₂ :

[tex]\tt \dfrac{1}{2}\times 1.66=0.83[/tex]

Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution

[tex]\large \boxed {\bold {M ~ = ~ \dfrac {n} {V}}}[/tex]

Where

M = Molarity

n = Number of moles of solute

V = Volume of solution

So the number of liters(V) of 3.00 M lead (II) iodide-PbI₂ (n=0.83, M=3):

[tex]\tt V=\dfrac{n}{M}\\\\V=\dfrac{0.83}{3}\\\\V=0.277~L[/tex]

Answer:

B if i'm not mistaken.

Explanation:

Answer:

Al2(SO4)3 + 3Mg(OH)2 → 2Al(OH)3 + 3MgSO4

Explanation:

Answer: Examples of pure substances include iron, aluminum, silver, and gold. Mixtures: Substances that have two or more different particles are mixtures. Examples of mixture include the salt solution which is a 'mixture' of two components, salt, and water.

Explanation:

Answer:

Atomic Radius can be simply defined as the distance between the last shell of electrons and the nucleus of an atom.

Answer: The atomic radius of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding shells of electrons. Illustrated Glossary of Organic Chemistry - Atomic radius. Atomic radius: The radius of an atom. This distance between an atom's nucleus and outer electron shell. ... Atomic radius differs with the bonding state of an atom (for example a nonbonded atom of an element versus the same element within a covalent bond). Atomic radius is determined as the distance between the nuclei of two identical atoms bonded together. The atomic radius of atoms generally decreases from left to right across a period. The atomic radius of atoms generally increases from top to bottom within a group.

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Answer:

4Fe+3O2------>2fe2O3

Explanation:

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Answer:

Extensive properties, such as mass and volume, depend on the amount of matter being measured. Intensive properties, such as density and color, do not depend on the amount of the substance present. Physical properties can be measured without changing a substance's chemical identity.

Explanation:

Answer:

Option D is correct

Explanation:

Nervous system is the network of nerve cells and fibres. This system helps to transfer nerve impulses among various parts of the body.

The excretory system performs the function of excretion and helps in discharging wastes.

The brain controls the release of the waste from the bladder. This is an example of the nervous system working with the excretory system.

In accordance with the law of conservation of mass, in any reaction, mass cannot be gained or lost; it must instead be constant in a system. Therefore, in a closed system, mass is not lost, but in an open system, mass is lost as it gets released into the air.

Because the reaction was balanced and contained in the gas collecting arrangement, the mass remained constant, but in the conventional configuration it was not, and the gas had to be released. Due to the gas being released into the atmosphere rather than being retained inside the arrangement, mass was lost.

When the reaction was studied in a closed environment where the gas was collected after the reaction, the mass changes were noted down, which helped to prove the point of the law of conservation of mass and energy. In this case, when the reaction setup was performed in a normal way, the mass lost in the surroundings was not considered or being calculated.

One might consider a soda can as an example, where the carbonated beverage has pressurized carbon dioxide gas in it. When the container is opened, the gas bubbles dissipate into the environment, therefore the mass changes are not recorded. The mass altered would stay the same if the soda can was opened in a manner that allowed the gas evolution to be monitored.

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Identifying each reaction with their correct term

A double replacement reaction is a type of chemical reaction whereby two reactants exchanges its ions ( cations or anions ) to produce two new products. It can also known as a double displacement reaction. while a single replacement reaction leads to the substitution of one element for another in chemical compound.

Hence we can conclude that the answers to your questions are as listed above.

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