A geochemist examines a piece of metal that he found in the soil. He performs tests to identify the metal from its density, electrical conductivity, and melting point. Which statement best describes his investigation? He is determining physical properties that are sufficient to identify the metal. He is determining chemical properties that are sufficient to identify the metal. He is determining physical properties that are insufficient to identify the metal. He is determining chemical properties that are insufficient to identify the metal.

Answer:

The correct answer is option D, that is, water bonds with elements in the minerals that make up rock, forming new substances​.

Explanation:

A hydration reaction in chemistry refers to a chemical reaction in which a substance associates with water. In the process of weathering hydration takes place when a mineral captivates water to produce a novel substance. Hydration makes the rock to increase in volume that can impart tension on the rock and make it more susceptible to other kinds of weathering processes. The two prime illustrations of hydration comprise the formation of limonite from hematite and the formation of gypsum from anhydrite.

Answer:

D. water bonds with elements in the minerals that make up rock, forming new substances.

Hope this Helps!! :))

Answer:

Explanation:

Scientific laws have been observed without exception in specific conditions.

Answer:

Scientific laws have been observed without exception in specific conditions.

Explanation:

study island :)

Answer:

The electrons that participate in chemical bonds are the valence electrons, which are the electrons found in an atom 's outermost shell.

Explanation:

Chemical bonding involves valence electrons, the electrons in an atom's outermost shell. There are two main types of bonds: ionic, which involves electron transfer, and covalent, which involves electron sharing.

In the context of chemical bonding, the electrons involved are the ones located in the outermost shell of an atom, called the valence electrons. An atom's chemical behavior and its propensity to form bonds are determined by its valence electrons. There are two main types of chemical bonds: ionic bonds and covalent bonds.

In ionic bonding, electrons are transferred from one atom (turning it into a positively charged ion, or cation) to another (turning it into a negatively charged ion, or anion). This results in an electrostatic attraction between the ions, forming an ionic bond.

Covalent bonding, on the other hand, involves the sharing of valence electrons between atoms. This can result in single, double, or triple bonds based on how many electron pairs are shared: two electrons for a single bond, four for a double bond, and six for a triple bond.

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Answer:

To do a proper push up

Explanation:

You need to keep your back straight, keep your hands at shoulder-width apart and keep your legs close but not too close.

Here's how to get set up to do a push up: When down on the ground, set your hands at a distance that is slightly wider than shoulder-width apart. Another good cue: draw a straight line down from your chest/nipple – it should be directly over your thumbnail.

Answer: sodium oxide

Explanation:

Answer:

sodium oxide

Explanation:

It's B - convection that is correct...

Answer:

B. convection

Explanation:

The sun heats the atmosphere and the surface of the Earth causing convection currents to develop in the atmosphere due to heated air that rise into the atmosphere.The ocean itself regulates temperatures at the lower parts of the atmosphere thus ensures the circulation of water in the ocean through currents and waves.At the equator, heated air loses its density, making it to rise, and when it reaches the troposphere it spreads towards the pole by convection.

Answer:

Earth

Explanation:

A Jovian Planet is a gas giant, the term is derived from Jupiter which describes the three other gas giants in the Solar System as Jupiter-like. So Jupiter, Saturn, Uranus and Neptune are the only considered Jovian Planets.

The term Jovian planets refers to the gas or ice giants in our Solar System, including Jupiter, Saturn, Uranus, and Neptune. Therefore, Earth, which is a terrestrial planet, is not a Jovian planet.

The term Jovian planets typically refers to the giant outer planets in our Solar System, which include Jupiter, Saturn, Uranus, and Neptune. These planets are often called the gas giants or ice giants because of their large sizes and gas or ice-rich compositions. From the given options; Saturn, Neptune, and Uranus are part of the four Jovian planets. Therefore, Earth is not a Jovian planet. Instead, Earth is considered a terrestrial planet, which means it's primarily composed of rock and metal and has a solid surface.

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Answer:

True

Explanation:

A tornado is a funnel cloud that has touched the ground.

When a funnel cloud reaches the ground it is called a tornado.

A funnel cloud is a rotating cone-shaped column of air extending downward from the base of a thunderstorm.

A. the amount of water is a constant (aka independent variable)

The amount of water is constant in the Jarrett in each of the three identical containers experiment.

The temperature at which a liquid boils and turns to vapour.

The water molecules need more energy to produce enough pressure to escape the boundary of the liquid.

The more salt (or any solute) added to water, the more you raise the boiling point.

When the ionic compound salt is added to the equation, it lowers the freezing point of the water.

Salt molecules block water molecules from packing together when the temperature is lowered.

It then prevents them from becoming ice. More water molecules leave the solid phase than the ones entering the solid phase.

Hence, option A is correct.

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Answer:

104 c = 377.15 k

-3 c = 270.15 k

Answer:

Hydroxide ion (OH-)

Explanation:

Most bases give up hydroxide ions whereas acids give up hydronium ions (H3O+).

Answer:

2 AL + Fe3N2 = 2 ALN + 3 Fe

The balanced equation for the reaction is 2 Al + Fe₃N₂ = 2AlN + 3Fe.

Aluminum reacts with iron nitride to form aluminum nitrate and iron metal.

The aluminum reacts slowly with nitrogen to form oxides and corrode.

The balanced equation is when both side of the reaction have equal moles of the compound.

Thus, the balanced equation for the reaction is 2 Al + Fe₃N₂ = 2AlN + 3Fe.

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It seems like the answer would be supporting services.

The water cycle, photosynthesis, nutrient cycling, and soil formation are examples of supporting services in the ecosystem.

The water cycle, photosynthesis, nutrient cycling, and soil formation are examples of supporting services. These services are a part of ecological or ecosystem services, which are categorized into four types: regulating services, provisioning services, cultural services, and supporting services. The supporting services are those essential ecological processes that are necessary for the existence and maintenance of other ecosystem services.

In the examples you provided, the water cycle supports the transport and availability of water for life, photosynthesis supports the production of oxygen and food for organisms, nutrient cycling supports the recycling of essential nutrients, and soil formation supports the growth of plants and the retention of water and nutrients.

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Answer:

b

Explanation:

trust me

Answer:

= 13.857 kJ

Explanation:

The heat required to melt ice from its solid state to water or liquid states without change in temperature is given by the formula;

Heat = mLf ; where m is the mass of ice and Lf is the latent heat of fusion,

The mass of ice in moles = 41.5 g/18 g

                                         = 2.306 moles

Therefore;

Heat = 2.306 moles × 6.009 kJ/mol

        = 13.857 kJ

As defined by Arrhenius:

An Arrhenius acid is a substance that dissociates in water to form hydrogen ions (H+). In other words, an acid increases the concentration of H+ ions in an aqueous solution. This protonation of water yields the hydronium ion (H3O+); in modern times, H+ is used as a shorthand for H3O+ because it is now known that a bare proton (H+) does not exist as a free species in aqueous solution.

An Arrhenius base is a substance that dissociates in water to form hydroxide (OH–) ions. In other words, a base increases the concentration of OH– ions in an aqueous solution.

Hope this helps!

Explanation:

According to Arrhenius concept:

An acid is defined as a substance which donates hydronium ions [tex](H_3O^+)[/tex] in water.

[tex]HA(aq)+H_2O(l)\rightarrow A^-(aq)+H_3O^+(aq)[/tex]

For example: hydrochloric acid , nitric acid etc.

[tex]HCl(aq)+H_2O(l)\rightarrow Cl^-(aq)+H_3O^+(aq)[/tex]

[tex]HNO_3(aq)+H_2O(l)\rightarrow NO_3^{-}(aq)+H_3O^+(aq)[/tex]

A base is defined as a substance which donates hydroxide ions [tex](OH^-)[/tex] when dissolved in water.

[tex]BOH(aq)\rightarrow B^+(aq)+OH^-(aq)[/tex]

For example: sodium hydroxide, calcium hydroxide etc.

[tex]NaOH(aq)\rightarrow Na^+(aq)+OH^-(aq)[/tex]

[tex]Ca(OH)_2(aq)\rightarrow Ca^{2+}(aq)+2OH^-(aq)[/tex]

Answer:

1) Since you have not provided the equations to select the right one, I am going to explain you the relevant facts that are used to solve this question.

2) The transuranium elements are the chemiical elements with atomic number greater than that of the uranium.

The atomic number of uranium is 92. So, the transuranium elements are the elements with atomic number 93 or greater.

This are some of the transuranium elements:

Neptunio - 93

Plutonium - 94

Americium - 95

Curium - 96

Berkelium - 97

Californium - 98

Einstenium - 99

And so all the known elements (the last one is the 118).

3) In a nuclear reaction the total mass number ( shown as superscript to the left of the symbol) and total atomic number (shown as subscript to the left of the symbol) are conserved.

4) Beta decay is the release of a beta particle, which is an electron (considered massles and with charge - 1). So, the beta decay is represented with the symbol:

0

 β, which means 0 mass and charge - 1.

-1

5) This is, then, an example of a β decay equation for one transuranium element:

239              239            0

     Np    →         Pu   +      β

 93                94            -1

As you see 239 = 239 + 0 and 93 = 94 - 1, showing that the total mass number ( shown as superscript to the left of the symbol) and the total atomic number (shown as subscript to the left of the symbol) are conserved.

Explanation:

Answer:

D. All of these

Explanation:

Reaction rate is a measure of speed of a chemical reaction.

The following factors control reaction rates:

1. Nature of the reactants

2. Concentration of the reactants or pressure if gaseous.

3. Temperature

4. Presence of catalyst

5. Sunlight

The reaction rate is directly proportional to the concentration of the reactants. For gaseous systems, the pressure is directly proportional to the concentration and so pressure can be used in place of concentration.

Temperature change has a considerable effect on reaction rates since temperature is directly proportional to the average kinetic energy of reacting particles. Generally, reaction rate varies as temperature directly. For every 10°C rise in temperature above room temperature, it has been found that reaction rates becomes double or triple.

When temperature of a reacting system increases:

I. The kinetic energy of each of the reacting particles inceases

II. The frequency of ordinary colliosions and effective collisions per unit time increases.

III. Many of the reacting particles would require energy greater than or equal to the activation energy of the reaction.

I am not sure about my answer, but I think that it's density allows it to fall to the ground/floor.

The property of air that allows it to flow down to the floor is related to convection and density. Warmer air is less dense and rises, while cooler air is more dense, descends and flows down to fill the space left by the rising warm air.

The property of air that allows it to flow down to the floor is related to the principles of convection and density. Specifically, warmer air is less dense than cool air. So, when air is heated, it becomes less dense and rises. Meanwhile, the cooler, denser air descends or flows down to replace the rising warm air. This constant switch involving the upward and downward movement of air as it heats and cools forms a convection current, leading to air's continual movement as it responds to changes in temperature.

For instance, in our homes, we often experience these changes in air movement. When we use a heater, it warms the air which then decreases in density and rises towards the ceiling. As that occurs, the cooler and denser air on the floor level is drawn upwards due to the displacement of the warmer air, causing a circulation - or convection current. The converse happens when we use an air conditioner or fan - cool air becomes denser and tends to flow down towards the floor level, pushing the warm air upwards.

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I pretty sure it’s (C) it’s volume will increase.

I hope this helped!

Answer : The correct option is, Its volume will increase.

Explanation :

According to the Charles' Law, the volume of the gas is directly proportional to the temperature of the gas at constant pressure and number of moles.

[tex]V\propto T[/tex]

That means the volume of gas is directly depends on the temperature of the gas.

As, the temperature of the gas increase, the volume of gas will also increases and vice-versa.

As per question, when a boy blows up a balloon and knots the end then he leaves it on the kitchen counter. When his little sister finds it and takes it outside in the sunshine then the volume of the balloon increases due to increase in the temperature.

Hence, the correct option is, Its volume will increase.

Answer:

18.94 mL.

Explanation:

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R is the general gas constant,

T is the temperature of the gas in K.

P₁V₁ = P₂V₂

P₁ = 9.4 mm Hg, V₁ = 1531.0 mL.

P₂ = 760.0 mm Hg, V₂ = ??? mL.

∴ V₂ = P₁V₁/P₂ = (9.4 mm Hg)(1531.0 mL)/(760.0 mm Hg) = 18.94 mL.

The answer is:

The new pressure will be equal to 6 atm.

[tex]P_{2}=6atm[/tex]

Since we know that the temperature is constant, we can use the Boyle's Law to solve the problem.

The Boyle's Law establishes that when the temperature is kept constant, the pressure and the volume will be proportional.

So, we have the equation:

[tex]P_{1}V_{1}=P_{2}V_{2}[/tex]

We are given,

[tex]P_{1}=2atm\\V_{1}=150mL\\V_{2}=50mL[/tex]

Substituting and isolating [tex]P_{2}[/tex] from the Boyle's Law, we have:

[tex]P_{1}V_{1}=P_{2}V_{2}\\\\P_{2}=\frac{P_{1}V_{1}}{V_{2}}\\\\P_{2}=\frac{2atm*150mL}{50mL}=6atm[/tex]

Hence, the new pressure will be equal to 6 atm.

[tex]P_{2}=6atm[/tex]

Have a nice day!

Answer:

In fact, some strong bases can burn the skin as badly as strong acids. Bases feel soapy or slippery because they react with acidic molecules in your skin called fatty acids. ... Like acids, bases change the colors of acid-base indicators, but the colors they produce are different. Bases turn litmus paper blue.

Acids are substances that release hydrogen ions in solution. Strong acids like Hydrochloric acid can cause a burning sensation when interacting with sensitive tissues while weak acids are generally safer to handle. Antacids are used to neutralize excess stomach acid and alleviate discomfort.

Acids are substances that release hydrogen ions (H*) in solution, having a high tendency to participate in chemical reactions. The feeling experienced when we come into contact with acids can highly depend on their strength and concentration. For instance, strong acids like Hydrochloric acid (HCl), found in stomach, aid digestion and kill ingested microbes but they can also cause a burning sensation when they leak into the esophagus, resulting in heartburn. As for weak acids like vinegar or acetic acid, they do not ionize completely and are generally safer to handle.

Antacids, which are bases like calcium carbonate (CaCO3) or magnesium hydroxide (Mg(OH)2), are typically taken to neutralize excess stomach acid when experiencing heartburn, thus reducing the uncomfortable burning sensation.

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Answer:

The molecules of the gas has more kinetic energy and has a lot of space between them. The molecules in the liquid moves slower than gas and has a tighter space than gas. Another difference is liquid takes up the shape of its container while gas does not. Cause its air.

Answer:

A

Explanation:

Dissolving a solid in liquid, in this instance table salt in water, is a physical change due to merely the state of the matter being altered. Physical changes almost always be reversed.

A A. physical property of salt is that it will dissolve in water.

Physical properties are characteristics that can be observed or measured without changing the substance's chemical identity. Examples include color, density, and solubility.

Chemical properties describe a substance's potential to undergo chemical changes or reactions and transform into a different substance. Examples include reactivity with acids and flammability.

When salt dissolves in water, it undergoes a physical change because the salt is merely dispersing at the molecular level within the water but remains chemically the same (sodium chloride). Therefore, dissolving is a physical property of salt.

Nitrogen has an electronegativity of 3.0 whereas hydrogen is 2.1 based on the Pauling scale. Therefore nitrogen is very electronegative and more electronegative than hydrogen

Electronegativity difference of N and H is 0.9

Covalent

Answer:

[tex]\boxed{\text{9.0 mL}}[/tex]

Explanation:

1. Write the balanced chemical equation.

AgNO₃ + HCl ⟶ AgCl + HNO₃

2. Calculate the moles of HCl

[tex]\text{Moles of HCl} =\text{30.0 mL HCl} \times \dfrac{\text{0.45 mmol HCl}}{\text{1 mL HCl}} = \text{13.5 mmol HCl}[/tex]

3. Calculate the moles of AgNO₃.

[tex]\text{Moles of AgNO}_{3} =\text{13.5 mmol HCl} \times \dfrac{\text{1 mmol AgNO}_{3}}{\text{1 mmol HCl}} = \text{13.5 mmol AgNO}_{3}[/tex]

4. Calculate the volume of AgNO₃

[tex]c = \text{13.5 mmol AgNO}_{3} \times \dfrac{\text{1 mL AgNO}_{3}}{\text{1.5 mmol AgNO}_{3}} = \text{9.0 mL AgNO}_{3}[/tex]

The titration will require [tex]\boxed{\textbf{9.0 mL}}[/tex] of AgNO₃.

Final answer:

To find the volume of 1.5 M AgNO3 required to react with 30.0 mL of a 0.45 M HCl solution, we can use the balanced equation. First, calculate the moles of HCl using volume × concentration. Then, calculate the volume of 1.5 M AgNO3 using the formula: moles ÷ concentration.

Explanation:

To find the volume of 1.5 M AgNO3 required to react with 30.0 mL of a 0.45 M HCl solution, we can use the balanced equation:

AgNO3 (aq) + HCl (aq) → AgCl (s) + HNO3 (aq)

First, we need to calculate the moles of HCl:

Moles of HCl = volume (L) × concentration (M)

Moles of HCl = 0.030 L × 0.45 M = 0.0135 mol

According to the balanced equation, 1 mole of HCl reacts with 1 mole of AgNO3. Therefore, we need 0.0135 mol of AgNO3.

Next, we can calculate the volume of 1.5 M AgNO3 using the formula:

Volume (L) = moles ÷ concentration (M)

Volume (L) = 0.0135 mol ÷ 1.5 M = 0.009 L = 9.0 mL

Answer:

C

Explanation:

Atomic orbitals overlap to form molecular orbitals in which the valence electrons in the atoms travel

Answer:

6.53g of K₂SO₄

Explanation:

Formula of the compound is K₂SO₄

Given parameters:

Volume of K₂SO₄ = 250mL = 250 x 10⁻³L

= 0.25L

Concentration of K₂SO₄ = 0.15M or 0. 15mol/L

Unknown:

Mass of K₂SO₄ =?

Methods:

We use the mole concept to solve this kind of problem.

>>First, we find the number of moles using the expression below:

Number of moles= concentration x volume

Solving for number of moles:

Number of moles = 0.25 x 01.5

= 0.0375mole

>>Secondly, we use the number of moles to find the mass of K₂SO₄ needed. This can be obtained using the expression below:

Mass(g) = number of moles x molar mass

Solving:

To find the molar mass of K₂SO₄, we must know the atomic mass of each element in the compound. This can be obtained using the periodic table.

For:

K = 39g

S = 32g

O = 16g

Molar mass of K₂SO₄ = (39x2) + 32 + (16x4)

= 78 +32 + 64

= 174g/mol

Using the expression:

Mass(g) = number of moles x molar mass

Mass of K₂SO₄ = 0.0375 x 174 = 6.53g

Answer:

6.97 g

Explanation:

cK-12

16.9 Molarity

Answer:

7.5 M

Explanation:

In order to find a solution's molar concentration, or molarity, you need to determine how many moles of solute, which in your case is sodium sulfate,  

Na

2

SO

4

, you get in one liter of solution.

That is how molarity was defined -- the number of moles of solute in one liter of solution.

So, you know that you have  

0.090

moles of solute in  

12 mL

of solution. Your goal here will be to scale up this solution by using this information as a conversion factor to help you determine the number of moles of solute present in