What is the SI unit of pressure and from what units is it derived

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Among these elements the strontium (Sr) has lowest first ionization energy.

The first ionization energy is the energy required to remove one mole of the most loosely held electrons from one mole of gaseous atoms to produce 1 mole of gaseous ions each with a charge of 1+.

The first of two main methods which scientists use to calculate the ionization energy is the Subtraction Method.

Answer:

Sr

Explanation:

The process of intentionally interfering with the breeding process to encourage certain traits over others is called artificial selection or selective breeding.

In selective breeding, the breeding of plants and animals are done intentionally to produce desirable traits. Organisms with the desired traits, such as size or taste, are artificially mated or cross-pollinated with organisms with similar desired traits. The deliberate exploitation of selective breeding to produce desired results has become very common in agriculture and experimental biology. In this way, the scientists control and introduce the desirable traits in plants and animals.

Answer:

I thin the artificial selection is the answer it also fits the spaces

Explanation:

ok so I went in did the crossword answers are

1. biotechnology

2. DNA

3. transgenic animals

4. Genetic Engineering

5. plant

6.  transgenic crop

7. Artificial Selection

8. food

9. clones

10. reproduction

Answer:

Explanation:

The given number is 6.02 × 10⁹. It is written is scientific notation.

As you see it has two parts:

If the exponent is negative means that the decimal point must be moved to the left and if the exponent is positive means that the decimal point must be moved to the right.

In the number 6.02 × 10⁹ the exponent is 9, so you must move the decimal point 9 places to the right:

A would be correct. Hope i helped.

Answer : The energy of a photon is [tex]18.619\times 10^{-20}J[/tex].

Solution : Given,

Frequency of a photon = [tex]2.81\times 10^{14}s^-[/tex]

Planck' constant = [tex]6.626\times 10^{-34}Js[/tex]

Formula used :

[tex]E=h\nu[/tex]

where,

E = Energy of a photon

h = Planck's constant

[tex]\nu[/tex] = Frequency of a photon

Now put all the given values in above formula, we get

[tex]E=(6.626\times 10^{-34}Js)\times (2.81\times 10^{14}s^-)[/tex] [tex]=18.619\times 10^{-20}J[/tex]

Thus, the energy of a photon is [tex]18.619\times 10^{-20}J[/tex].

Option B is correct option.

The half-reaction 2MnO2 + H2O + 2e- Mn2O3 is missing  OH- ions.

Explanation:

Full equation:

                                          2MnO2 + H2O + 2e-  → Mn2O3 + 2OH-

The option B which is Mg is stronger reducing agent than Ag is correct option.

Explanation:

Equation:

                               Mg(s) + 2Ag+ (aq) → Mg2+ (aq) + 2Ag(s)

According to equation Mg converts to Mg+2 which means it gives to electron to reduce Ag. So it act as an reducing agent.

The correct option is B. Which is  5, 1, 8, 5, 1, 4.

Explanation:

Full equation :

                  5 Fe²⁺ (aq) + MnO₄⁻ (aq) + 8 H⁺ (aq) --> 5 Fe³⁺ (aq) + Mn²⁺ (aq) + 4 H₂O (l)

The study of chemicals and bonds is called chemistry. There are different types of elements and these are metals and nonmetals.

The correct answer is mentioned below.

The answer to the first question is as follow:-

The full reaction is as follows:-

[tex]2MnO_2 + H_2O + 2e^- ----> Mn_2O_3 + 2OH^-[/tex]

The answer to the second question is as follow:-

Mg is a stronger reducing agent than Ag is correct

The reaction is as follows:-

[tex]Mg(s) + 2Ag+ (aq) ---> Mg2^+ (aq) + 2Ag(s)[/tex]

According to the equation Mg converts to Mg+2 which means it gives to electron to reduce Ag. So it acts as a reducing agent.

The answer to the third question is option B Which is  5, 1, 8, 5, 1, 4.

The full equation is as follows:-

[tex]5 Fe^{2+} (aq) + MnO_4^- (aq) + 8 H^+(aq) --> 5 Fe^{3+} (aq) + Mn^{2+} (aq) + 4 H_2O (l)[/tex]

Hence, the correct answer is described.

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Answer: The correct answer is Option B.

Explanation:

Oxidizing agent is the agent which oxidizes the other substance and itself gets reduced. It undergoes reduction reaction in which, it gains electrons and also the oxidation state of the substance gets reduced.

Reducing agent is the agent which reduces the other substance and itself gets oxidized. It undergoes oxidation reaction in which, it looses electrons and the oxidation state of the substance is increased.

For the given chemical equation:

[tex]Cu+2AgNO_3\rightarrow 2Ag+Cu(NO_3)_2[/tex]

Half reactions for the given chemical reaction:

[tex]Cu\rightarrow Cu^{2+}+2e^-[/tex]

Copper is loosing 2 electrons, thus it is undergoing oxidation reaction and is considered as a reducing agent.

[tex]Ag^++e^-\rightarrow Ag[/tex]

Silver ion is gaining 1 electron per atom, thus it is undergoing reduction reaction and is considered as an oxidizing agent.

Hence, [tex]AgNO_3[/tex] is considered as an oxidizing agent and therefore the correct answer is Option B.

Answer:

B

Explanation:

C3H8 is saturated compound.

A saturated compounds are organic compounds having single covalent bond between carbon atoms.

Answer: saturated

Explanation:

Saturated hydrocarbons are defined as the hydrocarbons in which a single bond is present between carbon and carbon atoms. The general formula for these hydrocarbons is [tex]C_nH_{2n+2}[/tex].

Unsaturated hydrocarbons are defined as the hydrocarbons which have double or triple covalent C-C bonds. They are known as alkenes and alkynes respectively. The general formula for these hydrocarbons is [tex]C_nH_{2n}[/tex] and [tex]C_nH_{2n-2}[/tex].

The given compound is [tex]C_3H_8[/tex] belongs to formula [tex]C_nH_{2n+2}[/tex]  where n=3 and thus a saturated hydrocarbon.

Air is in the state of matter known as a gas. While it can sometimes contain particles from other states (liquid or solid), these are suspended within the air, and the air itself remains a gas. Air is not normally in the state of plasma on Earth.

Air is considered to be in the state of matter known as a gas. This is one of the three most common states of matter, the others being solid and liquid. Gases have the property of conforming both to the shape and volume of their container. They can be compressed or expanded, unlike solids or liquids, which have a fixed volume.

Occasionally, air might contain particles from other states of matter, such as small droplets of water (a liquid) or dust (a solid). However, these are not part of the air itself, but suspended within it, so the air still remains a gas.

There is also another state of matter called plasma, which is like a gas but with some of the atoms ionized. This state of matter, typically found in high-temperature environments like stars and lightning strikes, is distinct from gases. However, under normal conditions on Earth, air is not a plasma but a gas.

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Hey There!:

Total number of moles of gases:

0.150 + 0.419 + 0.211 => 0.780 moles

Volume = 0.250 L

Temperature = 298 K

Using the ideal gas law:

p*V =  n*R*T , putting all the values we get :

p * 0.250 = 0.780 * 0.0821* 298

p* 0.250 = 19.083

p = 19.083 / 0.250

p = 76.3 atm

Hope That helps!

To find the total pressure of a gas mixture, calculate the individual pressures of each gas using the Ideal Gas Law and add them to get the total pressure according to Dalton's Law of partial pressures. The pressure of each component is calculated using its respective moles, the gas constant, temperature and volume, and adding up these pressures gives the total pressure of the mixture.

To calculate the total pressure of a gas mixture, we use the Ideal Gas Law PV=nRT, where P stands for pressure, V for volume, n for the number of moles, R is the universal gas constant and T is the temperature. In this context, it comes in hand with Dalton's Law of partial pressures, which states that in a mixture of non-reacting gases, the total pressure exerted is equal to the sum of the partial pressures of the individual gases.

Firstly, calculate the individual pressures of each gas in the mixture using the Ideal Gas Law, where for each gas, the number of moles, volume and temperature are known. Once the individual pressures are calculated, you add them together to get the total pressure of the gas mixture.

Therefore you would find that:

Sum these up to determine the total pressure of the mixture.

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The shaded area labeled as 2 is likely to have subatomic particle that are constantly in motion.

The subatomic particles of the atom that are constantly in motion are called as electrons. The probability of finding electrons in the region shaded and labeled as 2. Electrons are in continuous motion in orbits around the nucleus of the atom. Therefore, the answer is 2.

answer: 2 and 4

looking at the diagram, we know that 1 and 3 are both in the nucleus which contain both protons (positive charge) and neutrons (neutral charge). the outer area, or "cloud" (2), contains electrons that are in constant motion. number 4 is located in the electron cloud with the name "orbitals" which showcase "waves" created by the movement of an electron in an atom. knowing how electrons are always moving due to their charge, locations 2 and 4 would possess subatomic particles that are constantly in motion.

i also took the test !!  

Petroleum is a primary source of hydrocarbons. Therefore, the correct option is option C among all the given option.

Only hydrogen and carbon atoms make up the organic molecules known as hydrocarbons. They are the basic elements that make up fossil fuels including coal, oil, and natural gas. Hydrocarbons have a wide range of uses and are essential to many sectors of the economy, including manufacturing, energy, transportation, and agriculture. The energy component of hydrocarbons is one of its primary uses. Hydrocarbons are dependable sources of energy since they burn with a lot of heat released. Petroleum is a primary source of hydrocarbons.

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The statement of mass number of an atom is "the number of protons plus the number of neutrons in a nucleus."

The total number of protons and neutrons in an atomic nucleus is known as the mass number, often known as the atomic mass number or nucleon number. Each atom also has a mass number, which is represented by the symbol A. The atom's mass number equals the sum of the number of protons and neutrons in the nucleus.

Protons + neutrons = mass number

Hence the correct answer is the number of protons plus the number of neutrons in a nucleus.

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It is false because an endothermic reaction will also start when energy is received from the environment when there is no solution involved

Answer is: Kr (krypton).

Krypton is a chemical element with symbol Kr and atomic number 36.

Krypton has 36 electron and 36. It is noble gas (group 18).

Noble gases are in group 18: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe) and radon (Rn). They have very low chemical reactivity.

Platinum (Pt), vanadium (V) and lithium (Li) are metals.

Answer:

Krypton is non metal.

Explanation:

The difference between a metal and non metal is that metals are ready to give electrons to attain half filled or full filled electron stability.

Non metal are reluctant to give electrons.

Out of the given choices

a) Pt : platinum is a transition metal.

b) V : Vanadium is a transition metal.

c) Li: Lithium is an alkali metal

d) Kr : Krypton is a non metal. It is a noble gas with full filled stability.

When you decrease the pressure, molecules don't hit each other as often and the rate of reaction decreases. Pressure is also related to concentration and volume. By decreasing the volume available to the molecules of gas, you are increasing the concentration of molecules in a specific space.

Lowering the amont of reactants

newtons third law is.........

for every reaction there is an equal and oposite reaction force

ex. im pushing the squares on my keyboard and it pushing back on me

im siting on my chair, the chair pushes on the floor and my butt pushes on the chair

The following accurately describes Newton’s third law is:

d) "For every action force, there is an equal and opposite reaction force."

Newton's third law of motion, often stated as "For every action, there is an equal and opposite reaction," describes the relationship between the forces acting on two interacting objects. According to this law, when one object exerts a force on a second object, the second object exerts a force of equal magnitude but in the opposite direction on the first object. This law illustrates the principle of conservation of momentum, which means that the total momentum of an isolated system remains constant.

The other options provided are not accurate descriptions of Newton's third law:

a) "The relationship among mass, acceleration, and net force" refers to Newton's second law of motion (F=ma), which explains the relationship between force, mass, and acceleration of an object.

b) "The stronger the net force acting upon an object, the greater the acceleration of the object" is a partial description of Newton's second law, which states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.

c) "An object in motion stays in motion, and an object at rest stays at rest, unless an unbalanced force acts upon it" is Newton's first law of motion, also known as the law of inertia. It describes how an object's motion remains unchanged unless acted upon by an external force.

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Answer: Option (a) is the correct answer.

Explanation:

Sodium has atomic number 11 ans its electronic configuration is [tex]1s^{2}2s^{2}2p^{6}3s^{1}[/tex].

Sodium has one extra electron. Therefore , in order to gain stability sodium readily loses an electron to an electronegative atom. Hence, it becomes stable.

Thus, we can conclude that out of the given options, Na is the most reactive metal.

Answer is:  germanium is represented by the electron configuration in example B.

Electron configuration of an element: 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p².

According to electron configuration, this element has 32 electrons.

Element with 32 electrons and 32 protons (atomic number 32) is germanium.

Germanium (symbol: Ge) is a lustrous, hard, grayish-white metalloid in the carbon group.

The element that can be represented with the given electron configuration [.1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p².] is Germanium

Therefore, germanium has the electron configuration of [..1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p².

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To visually represent a polymer, Georgina should use building blocks like atomic model kits, jelly tots, playdough, and toothpicks to build models of monomers such as ethene, propene, or vinyl chloride. These materials can effectively demonstrate the connection between monomers to form a polymer chain, serving as an educational tool for understanding molecular models and polymer chemistry.

Georgina wants to visually represent a polymer. The best model for representing a polymer would be building blocks, such as atomic model kits, jelly tots, playdough, and toothpicks. These materials provide the flexibility needed to showcase how individual monomers can be connected to form more complex structures, mimicking the actual chemical bonding of polymers. For example, if one were to build models of ethene, propene, or vinyl chloride monomers, they could use colored balls or jelly tots to represent the atoms and use toothpicks or sticks to represent the bonds between them, creating clear visual representations of each monomer.

By connecting these basic structures together, one can simulate the formation of a polymer chain. This hands-on approach helps illustrate the concept of monomers linking to form polymers and enhances the understanding of the molecular models and the chemical properties of the individual building blocks or functional groups within the polymer structure.

Answer: Evaporation and condensation are the two changes in state which are most represented in water cycle.

Explanation:

A process of circulation of water by passing through different states between the atmosphere, oceans and land is known as water cycle.

In water cycle, the most represented changes in state are evaporation and condensation. As during evaporation, the water present in the oceans, rivers, wells or on the land evaporates because of the heat from the sun as a result the liquid state is changing into gas.

Whereas, during condensation gas or water vapours changes into liquid. For example, when water condenses in the atmosphere it results in the formation of clouds.

Thus, it can be concluded that evaporation and condensation are the two changes in state which are most represented in water cycle.

Evaporation and condensation are the two primary changes of state represented in the water cycle, where water continually transitions between liquid and gas as it is heated by the sun and cools in the atmosphere.

The two changes in state that are most represented in the water cycle are evaporation and condensation. During evaporation, liquid water is transformed into water vapor, a gas, as it gains heat from the sun or the air. This water vapor then rises into the atmosphere. When the water vapor cools, it undergoes condensation, turning back into liquid water and forming clouds. These two processes play a vital role in the recycling of water on Earth and are essential aspects of the global climate system.

Evaporation and condensation, respectively, represent the equilibrium between the liquid and gas states of water. They are continually occurring throughout the Earth's surface and atmosphere, driving the water cycle and influencing weather and climate.

Final answer:

Correct option is: 4 N, left. The net force on the person standing on ice who throws a snowball to the right with a force of 4 N is 4 N to the left, in accordance with Newton's third law of motion.

Explanation:

The question involves understanding Newton's third law of motion, which states that for every action, there is an equal and opposite reaction. In this scenario, a person standing on ice throws a snowball to the right with a force of 4 N. According to Newton's third law, the snowball exerts an equal force of 4 N to the left on the person. Therefore, the net force on the person is 4 N to the left, as the forces exerted by the person on the snowball and by the snowball on the person are action-reaction pairs and do not cancel each other out. Instead, they act on different objects.

Which of the following pairs is an example of the diagonal rule?  

Fe, Rh

The produced moles of O₂ is "0.300 mol".

According to the question,

Moles of KO₂:

The equation is:

→ [tex]4 KO_2 + 2 CO_2 \rightarrow 2 K_2CO_3+ 3 O_2[/tex]

Now,

→ The moles of O₂ will be:

= [tex]\frac{3}{4}\times moles \ of \ KO_2[/tex]

By substituting the values, we get

= [tex]\frac{3}{4}\times 0.400[/tex]

= [tex]0.300 \ mol[/tex]

Thus the above answer is right.

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Answer:-  6200 kg

Solution:- Volume of bromine is given as [tex]2.0m^3[/tex] and it's density is [tex]\frac{3.1g}{mL}[/tex]. It asks to calculate the mass of bromine in kg.

We need to do the unit conversions for volume from [tex]m^3[/tex] to [tex]cm^3[/tex] and then mL. After this the volume is multiplied by density to get the mass in grams that could further be converted to kg. The set is shown as:

[tex]2.0m^3(\frac{(100cm)^3}{1m^3})(\frac{1mL}{1cm^3})(\frac{3.1g}{1mL})(\frac{0.001kg}{1g})[/tex]

= 6200 kg

So, the mass of bromine in the given volume of it is 6200 kg.

Final answer:

To find the mass in kg of 2.0 m3 of Br2, we convert the volume to cm3, use the given density to find the mass in grams, and then convert the mass to kilograms, resulting in 6,200 kg.

Explanation:

The question asked is: What is the mass (in kg) of 2.0m3 of Br2? Given that 1 mL is equal to 1 cm3 and 3.1 g Br2 = 1 mL Br2, the first step is to convert the given volume in meters cubed (m3) to cubic centimeters (cm3). Knowing that 1 m = 100 cm, we cube both sides to get 1 m3 = 1,000,000 cm3 or 106 cm3.

Therefore, 2.0 m3 = 2.0 × 106 cm3. Next, we use the density of Br2 to find the mass: 3.1 g/cm3. So, the mass of 2.0 m3 of Br2 in grams is 2.0 × 106 cm3 × 3.1 g/cm3 = 6,200,000 g. To convert this to kilograms, we divide by 1,000, resulting in 6,200 kg.

Eutrophication causes excess algae growth because of fertilizer and sewage runoff because of the amounts of nitrogen and phosphorus it contains

Answer:

B

Explanation:

Eutrophication is a major problem for the ecosystems surrounding farmlands. This is as a result of farmers irresponsibly using fertilisers, and end up adding too much to their soil.

The way they see it, is that the more fertiliser they give the plants, the better the plants will grow, unfortunately plants can only take up so much nutrients, and what ends up happening is when the rain comes, a lot of the nutrients in the soil get washed away, and they usually end up in steams or lakes.

Now fertilisers are not specific to certain plants, so algae, which grows in lakes and streams, now have access to an almost endless supply of nutrients. So, what happens is the algae take up nutrients, and grow so much, that it ends up absorbing all the oxygen dissolved in the water. This  causes the fish to die, due to the lack of oxygen and the body of water becomes uninhabitable.