Write formulas for the binary ionic compounds formed between the following elements: a. Potassium and iodine b. Magnesium and chlorine c. Sodium and sulfur d. Aluminum and sulfur e. Aluminum and nitrogen

4 annnnnd 3

kio too no

Answer:

4 and 3

Explanation:

We have to answer based on basic concept on electron.

The correct answer is: Since electrons repel each other, electrons pairs will be as far apart as possible.

We know, electrons are negatively charged particles and  negatively charged particles  repel to each other.

When electrons which are of similar charge repel each other, they go far apart from each other..

12.  The answer is; the satellite cools off by radiation

In the vacuum of space, there is no medium for convectional heat transfer. Only electromagnetic radiation transfer energy through space. The satellite will, therefore, lose heat through infra-red radiation, not convection.

13.   The answer is; heat will transfer to her feet by conduction

When the beachgoer wears her sandals, he makes contact with the sandals and his foot and sandal becomes one thermodynamic system.  The heat transfer by conduction, as it passes through the skin, seeks thermal equilibrium.  

15.  The answer is; elastic potential to kinetic

The more the string of the bow is pulled, the higher the elastic potential energy it gains. This is because the string is stretched and has the capacity to restore normal size when released.  When the string is released and begins to rapidly restore, it transfers this energy to the arrow, pushing the arrow forward.

16.    The answer is; Reduced friction means increased efficiency.

By lubricating the moving components of the engine, friction is reduced. Friction causes a loss of energy as the energy is lost through heat as the components rub against one another. Reduction of friction, therefore, reduces this loss and more energy is channeled towards the drive shaft.

17.  The answer is; It increases friction by air resistance.

A parachute is designed to increase drag exceptionally hence reduce the speed of a moving object drastically. Drag is induced by frictional resistance. When the parachute deploys, air is impeded from passing smoothly over the parachute hence enormous air resistance is developed causing the space shuttle to reduce speed.  

This answer explains concepts related to satellite cooling, heat transfer in sandals, potential energy of particles, energy changes in a bow and arrow, and the effect of reducing friction in an engine.

12. When a satellite in space receives no direct sunlight, it cools off by radiation.

13. When a beachgoer leaves her sandals on the shore and puts them back on after swimming, the bottom of her feet feel hot because the sandals were warmed by radiation.

14. In the given scenario, particle C has the greatest potential energy.

15. As a bow is drawn and released, the energy change that occurs is from elastic potential to kinetic.

16. Reducing friction in an engine will result in reduced heat transfer.

17. The parachute helps the space shuttle come to a complete stop during landing by increasing friction by air resistance.

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The atomic number of an atom is the number of A.protons                                                 An ion is an atom D. That has the same number of protons and neutrons.

Which of the following is true regarding photosynthesis and respiration? C. Photosynthesis breaks down glucose; respiration makes glucose.      hope this helps

1. The atomic number of an atom is the number of protons in the nucleus.

2. An ion is an atom that has an unequal number of protons and electrons.

3. Photosynthesis occurs in the chloroplasts; respiration occurs in the mitochondria.

I take that the insects remain constant no matter what happens to the frogs (which the frogs eat presumably). So a constant food supply for the frogs is not the problem.

The line for the alligators increases over time. It their numbers increase, the frogs are in trouble. The alligators will pursue lunch with determined single mindedness and there are more of them around.

So the frogs should decrease. Their natural enemy is the alligator and alligators won't go after insects. It's not worth their time.

A is the only answer you can choose.

I believe the answer is D

The average kinetic energy of an object's particles is represented by the Thermal Energy. It is a measure of how fast the particles within an object are moving. Therefore the more thermal energy an object has, the higher the average kinetic energy of its particles.

The average kinetic energy of an object's particles is represented by Thermal Energy. Kinetic energy is the energy of motion. For a single particle, it is given by the formula 1/2 mv^2 where m is the mass and v is the velocity of the particle. When we talk about particles in an object, the average kinetic energy of all these moving particles is referred to as the thermal energy.

The more thermal energy an object has, the faster its particles are moving and therefore the higher the average kinetic energy of its particles.

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the answer is the first one aneroid measures air pressure using a metal chamber thats sensitive to pressure changes and is using no liquid.

Aneroid

Aneroid Barometers if anybody have a barometer at home , it is probably an aneroid barometer . The word aneroid means with out liquid .An aneroid barometer has an airtight metal chamber , as shown in figure 6 metal chamber is sensitive to change in air pressure.

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1) Amorphous means “without form or structure".

In amorphous solid atoms and molecules are not organized in a definite lattice pattern. For example plastic, gel or glass.

Crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

2) Amorphous solids do not have definite melting points.

Crystalline solids have definitive melting point.

I think it is A. DSM

Psychologists and psychiatrists use the Diagnostic and Statistical Manual of Mental Disorders (DSM) to diagnose mental disorders, with the current version being DSM-5, published by the American Psychiatric Association in 2013.

Psychologists and psychiatrists diagnose mental disorders in patients using the Diagnostic and Statistical Manual of Mental Disorders (DSM). This manual provides a comprehensive set of criteria for diagnosing various mental health conditions.

It includes detailed descriptions of each disorder, diagnostic criteria, prevalence information, and associated risk factors. The DSM is not only utilized by mental health professionals but also by researchers, health insurance companies, and policymakers. Developed and published by the American Psychiatric Association, the DSM has undergone several revisions, with the most recent edition being DSM-5, released in 2013.

The correct answer to the question of which tool allows professionals to diagnose mental disorders is D. Diagnostic and Statistical Manual of Mental Disorders.

The uranium within these items is radioactive and should be treated with care. Uranium's most stable isotope, uranium-238, has a half-life of about 4,468,000,000 years. It decays into thorium-234 through alpha decay or decays through spontaneous fission.

The answer is; D

Solvation is the process by which the molecules of a solute interact with those of a solvent to form solvates. The interaction involves the formation of temporary bonds between the molecules of the elements. These bonds in this rection absorb energy from the atmosphere hence the reaction feels cold to the touch. This is called an endothermic reaction.

its c not d i just answered it

Answer:

Lithium has an atomic number Z of 3, so by definition, it has 3 protons. Hence, neutral lithium atoms must contain 3 electrons.

Explanation:

A neutral atom of lithium contains 3 electrons.

The number of electrons in a neutral atom is equal to its atomic number. The atomic number of an element represents the number of protons in its nucleus, and since atoms are electrically neutral (having no net charge), the number of electrons in the atom is also equal to the number of protons.

For lithium (Li), you can find its atomic number on the periodic table, which is 3. This means that lithium has 3 protons in its nucleus, and therefore, it also has 3 electrons to balance the positive charge of the protons. In a neutral atom, the number of electrons equals the number of protons, making lithium, with its 3 electrons, an electrically neutral atom.

To learn more about electrons, here

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Answer: The roll of lead (II) nitrate is that it is a limiting reactant of the reaction.

Solution : Given,

Molarity of [tex]FeCl_3[/tex] = 0.1 M

Volume of [tex]FeCl_3[/tex] = 50.0 ml = 0.05 L     (1 L = 1000 ml)

Molarity of [tex]Pb(NO_3)_2[/tex] = 0.1 M

Volume of [tex]Pb(NO_3)_2[/tex] = 50.0 ml = 0.05 L

First we have to calculate the moles of [tex]FeCl_3[/tex] and [tex]Pb(NO_3)_2[/tex].

[tex]\text{ Moles of }FeCl_3=\text{ Molarity}\times \text{ Volume in L}[/tex]

[tex]\text{ Moles of }FeCl_3=(0.100M)\times (0.05L)=0.005moles[/tex]

[tex]\text{ Moles of }Pb(NO_3)_2=\text{ Molarity}\times \text{ Volume in L}[/tex]

[tex]\text{ Moles of }Pb(NO_3)_2=(0.100M)\times (0.05L)=0.005moles[/tex]

The balanced chemical reaction is,

[tex]2FeCl_3+3Pb(NO_3)_2\rightarrow 2Fe(NO_3)_3+3PbCl_2[/tex]

From the balanced chemical equation, we conclude that

3 moles of lead nitrate react with 2 moles of ferric chloride.

Thus 0.005 moles of lead nitrate react with [tex]=\frac{2}{3}\times 0.005=0.0033[/tex] moles of ferric chloride.

Moles of ferric chloride will be left unreacted = 0.005 - 0.0033 =0.0017 moles

Limiting reagent is the reagent in the reaction which limits the formation of product.

Excess reagent is the reagent in the reaction which is in excess and thus remains unreacted.

Therefore, in the given reaction, lead nitrate is the limiting reagent and ferric chloride is the excess reagent.

Answer: iron (III) chloride is the excess reactant in the reaction.

Explanation:

i just did the assignment

The molecules  of hydrogen gas that are  formed is  when 48.7 g  of sodium are added to water  is  6.375  x 10²³  molecules

  calculation

2 Na +2H₂O →  2 NaOH  +H₂

Step 1: find the moles  of sodium (Na)

moles =mass÷   molar mass

from periodic table the molar mass of Na = 23 g/mol

moles= 48.7 g÷ 23 g/mol =2.117 moles

Step 2:use the mole ratio to determine  the  moles of H₂

  from  given equation  Na:H₂ is 2:1

therefore the moles  of H₂ = 2.117 moles x 1/2=1.059 moles

Step 3: find the molecules of H₂ using the Avogadro's law

According  to  Avogadro's  law  1 mole = 6.02 x 10²³ molecules

                                                      1.059 moles = ?  molecules

by cross multiplication

= [(1.059 moles x 6.02 x10²³  molecules) /  1 mole] =6.375  x 10²³  molecules

Answer : The correct option is, (D) Velocity

Explanation :

Velocity : It measures the speed of an object in a particular direction. It is a vector quantity. It depends on the magnitude and the direction. The S.I unit of velocity is, [tex]m/s[/tex]

Distance : It measures the length between the two objects. The S.I unit of distance is, meter.

Speed : It is defined as the distance traveled per unit of time. It does not have a direction. The S.I unit of speed is, [tex]m/s[/tex]

Acceleration : It is defined as the rate of change of velocity of an object with respect to time. The S.I unit of acceleration is, [tex]m/s^2[/tex]

Hence, the motion we can determine from the given data is, velocity.

You are riding a bicycle home from school. The average speed 5 m/s headed towards south.The motion that determine from this data is D. Velocity .

You can determine the velocity from the given data, as it includes both the speed (5 m/s) and the direction (south).

It is important to distinguish between speed and velocity:

Correct question is: You are riding a bicycle home from school. The average speed 5 m/s headed towards south. What motion can you determine from this data?
A. Acceleration
B. Distance
C. Speed
D. Velocity

Answer: Isabel has to recall the information about using a manual stick shift. For this reason, she is using long-term, explicit, declarative and episodic memory system.

Human memory system can be broadly classified as: sensory memory, short-term memory and long-term memory.

Long-term memory is used to recall information. If the information are about facts, events and experiences then explicit, declarative and episodic memory helps to recall all information. This will help Isabel to recall all information about driving a car with a manual stick shift and she will be able to drive her sister's car.

Isabel is using her procedural memory system to recall the information needed to operate a manual stick shift car. Procedural memory is a type of long-term memory that stores information about how to perform various skills and tasks, including those that involve motor skills and sequences of actions.

In this case, Isabel has previously learned how to operate a manual transmission car, and this knowledge is stored in her procedural memory. However, after many years of driving an automatic car, the specific motor skills and sequential actions required to shift gears in a manual car may have become less automatic for her.

When she gets into her sister's car with a manual transmission, she needs a few minutes to reacquaint herself with the physical movements and coordination required to shift gears. During this process, she is accessing her procedural memory to retrieve the previously learned information about operating a manual stick shift, and her brain is working to reestablish the neural pathways and muscle memory associated with this skill.

To learn more about procedural, click here.

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Answer is: beryllium fluoride has sp hybridization.

Beryllium (Be) is metal from group 2 and fluorine (F) is nonmetal from group 17.

Electron configuration of beryllium atom: ₄Be: 1s² 2s².

Electron configuration of fluorine atom: ₉F 1s² 2s² 2p⁵.

In beryllium, one electron from 2s orbital gets excitted to the level of 2p orbital; s and p orbital are hybridized and form two sp-hybridised  orbitals arranged in a linear shape.

Two fluorine atoms come closer to beryllium atom and sp hybridised orbitals of Be and p orbital of F get overlapped with each other and make bonds.

The hybridization of orbitals in beryllium fluoride (BeF2) is sp hybridization, resulting in a linear molecular geometry with a bond angle of 180 degrees due to the two sp hybrid orbitals formed from the 2s and 2p orbitals of beryllium.

The hybridization of orbitals in beryllium fluoride, BeF2, is sp hybridization. Beryllium in its ground state has a 1s22s2 electron configuration, and to form bonds, one of the 2s electrons is promoted to the empty 2p orbital. After this, the 2s and one of the 2p orbitals hybridize to form two new orbitals that are identical in energy and shape, which are called sp hybrid orbitals. These hybrid orbitals in BeF2 ensure the molecule has a linear structure with a bond angle of 180 degrees.

A Lewis structure of BeF2 shows a beryllium atom with two single bonds to two fluorine atoms, each having three lone pairs of electrons. The linear geometry of BeF2 is maintained because of the two sp hybrid orbitals pointing in opposite directions away from the central beryllium atom to form bonds with the fluorine atoms.

Answer is: 2. dillute acids feel slipper.

1) Acids are corrosive is correct. For example hydrochloric acid (HCl) will react with most metals.

2) Dillute acids feel slippery is not correct. Bases, for example solution of sodium hydroxide feels slipery.

3) Acids have a distinctly sour taste is correct. For example, vinegar is mixture of acetic acid (CH₃COOH) and water (H₂O). Vinegar is colourless liquid with sour taste and pungent smell, freezing point of the vinegar is lower than glacial acetic acid.

4) Acids have more hydronium ions than hydroxide ions is correct. Because acid gives a lot of hydrogen cations (H⁺), pH (pH = -log[H⁺]) is lower than seven (acidic solution).

Answer: its (2) dillute acids feel slippery

Explanation:

its a base not acid

Answer:

The temperature will remain the same.

Explanation:

When a material goes through a change of state, the temperature remains the same as witnessed on a temperature versus the time graph. Each change of state, that is, condensation, evaporation, melting, and fusion needs the withdrawal or supplementation of energy called latent heat. At the point of a change of state, there is no change in temperature. Though, in between the changes of states, the modifications in temperatures are brought about by the sensible heat.

In the given chemical reaction, 3.0 moles of hydrogen will be produced from 2.0 moles of aluminum.

In the given chemical reaction:

2Al + 3H2SO2 ⟶ 3H2 + Al2(SO2)3

We can see that 2 moles of aluminum (Al) react to produce 3 moles of hydrogen (H2). Therefore, if we start with 2.0 mol of aluminum, we can calculate the moles of hydrogen produced as follows:

2.0 mol Al x (3 mol H2 / 2 mol Al) = 3.0 mol H2

So, 3.0 moles of hydrogen will be produced from 2.0 moles of aluminum.

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For the chemical reaction 2Al + 3H₂SO₄ rightarrow Al₂(SO₄)₃ + 3H₂, 2.0 moles of aluminum will produce 3 moles of hydrogen gas.

Moles of hydrogen (H₂) will be produced from 2.0 mol of aluminum (Al) in the reaction with sulfuric acid. According to the balanced chemical equation 2Al + 3H₂SO₄ rightarrowAl₂(SO₄)₃ + 3H₂, 2 moles of aluminum produce 3 moles of hydrogen gas.

Using stoichiometry, we can set up a ratio from the coefficients in the balanced equation: 2 moles of Al : 3 moles of H₂. Therefore, if we start with 2.0 moles of Al, we will produce 3 moles of H₂.

Here's the calculation:
(2.0 moles Al)*(3 moles H₂ / 2 moles Al) = 3 moles H₂.

True!

Energy can change from Potential to Kinetic and so on.

This is actually called energy transformation!

Answer: D relative humidity

Explanation: Just took the test.

Relative Humidity is the amount of water vapor in air, as a percentage of the maximum amount the air could hold at the same temperature. The other options refer to different concepts in weather science and chemistry.

The amount of water vapor in the air, compared to the maximum amount that can be held at a specific air temperature is called Relative Humidity. This term is a measure used in weather science to describe the percentage of moisture in the air in relation to the maximum amount the air could hold at the same temperature.

For example, if the Relative Humidity is 50%, it means that the air is carrying 50% of the total moisture it could hold at that particular temperature.

Other options like Dew Point, Precipitation, and Crystallization refer to different concepts. Dew Point is the temperature at which the air is saturated and water vapor begins to condense into dew. Precipitation is any form of water particles, liquid or solid, that fall from the atmosphere and reach the ground. Crystallization is a process in chemistry involving the formation of solid crystals from a homogeneous solution.

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Answer:

See below  

Step-by-step explanation:

The O = 16 scale became the standard in 1903 and carbon-12 was chosen in 1961.

Your answer is strontium

Means that the African continent was once in the higher latitudes, and in contact with Antarctica, where glaciers form due to the low temperatures in the poles. The continent drifted over time due to tectonic plate movement. Continental drift is powered by the convection current in the mantle of the earth.

The answers that apply are;

When air is compressed, it means the same volume of space is occupied by more air molecules. This, therefore, means that the molecules are hitting each other with a higher frequency hence become hotter with more compression. It weighs more because there are more molecules in the same volume of space.

Answer:

air weighs more

air molecules are closer together  

air is colder

Explanation: Trust me, I did the test and it was correct

In an isolated system, the increase in potential energy caused by a chemical reaction is compensated by a decrease in temperature, as no energy or matter is exchanged with the surroundings.

In an isolated system, no matter or energy is exchanged with the surroundings. Therefore, when a chemical reaction occurs in an isolated system causing an increase in potential energy, the energy does not come from an external source but rather a conversion from another form of energy within the system. This conversion means that heat (internal energy) was used to increase the potential energy. As a result, since the total energy in the system must remain constant (Law of Conservation of Energy), the temperature of the system would have to decrease to compensate for the energy used in increasing the potential energy (as per the definition of temperature as a measure of the average kinetic energy of the particles in a system). Therefore, statement A is true: the temperature of the system decreased.

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D. Lithium or Li has the smallest ionization energy of those listed with an energy of 5,3917.

I hope that helps u!

Lithium (Li) has the smallest ionization energy out of the given elements due to its single valence electron and relatively small nuclear charge, which makes it easier to remove an electron compared to Boron (B), Nitrogen (N), and especially Neon (Ne).

The element with the smallest ionization energy among Nitrogen (N), Neon (Ne), Boron (B), and Lithium (Li) is Lithium (Li). Ionization energy is the energy required to remove an electron from an atom in the gaseous state. Generally, ionization energy decreases as we move down a group in the periodic table because the outermost electron is farther from the nucleus and feels less nuclear attraction. Lithium, being in the first group and the second period of the periodic table, has only a single electron in its outer shell and a smaller nuclear charge compared to the other listed elements, making it easier to remove this electron. In comparison, Neon (Ne), as a noble gas, has a complete valence shell and a larger nuclear charge, resulting in a much higher ionization energy. Boron (B), while higher in ionization energy compared to Lithium, has lower ionization energy than Nitrogen due to having fewer electrons in its valence shell. Nitrogen (N) has a half-filled p subshell, which is relatively stable, raising its ionization energy higher than that of Boron.

The answer to this question is A. Humidity.. because humitity causes steam

the answer is C. water vapor