• How do materials move
inside plants?

Answer: Option A, B and C

Explanation:

An ecosystem can be defined as the place which can survive on its own. There are various types of biotic and abiotic components available in the ecosystem.

An aquarium, lake and soil in backyard can be a source of ecosystem because they all have biotic and abiotic components in themselves. An aquarium has water, small plants in them. they make food by the help of sunlight and some smaller fishes feed on them.

Soil also has small insects and large plants that live on their own without the need of anything outside that environment.

Answer:

Zn(s) -> Zn2+(aq) + 2e

Explanation:

Zinc atoms = no charge

Zinc ions = +ve charge

The process of half equation for zinc is called oxidation .

(oxidation means loss of electrons)

Answer:

Cell division is important for growth,maintenance of proper chromosome number,wound healing

Explanation:

1 Cell division results in the formation of new cells which further undergo division to form new cells and so forth.Thus many cells are formed which are organized in tissues.Tissues then builds up organs and a number of organs builds up total body.

2 Cell division helps to maintain its chromosome number within the newly formed daughter cells.

3 Division of cells result in the formation of new cells in the site of wound and this accumalation of new cells in the wound region replace damaged and dead cells thus ultimately results in wound healing.

Answer:

The molarity of acid is 3 M.

Explanation:

Given data:

Volume of H₃PO₄ = 25 mL

Volume of NaOH = 50 mL

Molarity of NaOH = 1.50 M

Molarity of  H₃PO₄ = ?

Solution:

Formula:

M₁V₁  =  M₂V₂

M₁ = M₂V₂ / V₁

M₁ = 1.50 M ×50 mL / 25 mL

M₁ = 75 M. mL / 25 mL

M₁ = 3 M

The molarity of acid is 3 M.

To determine the molarity of the acid, we can use the mole ratio between H3PO4 and NaOH in the neutralization reaction. By calculating the moles of NaOH used and using the mole ratio, we can find the moles of H3PO4. Finally, dividing the moles of H3PO4 by the volume of the sample gives us the molarity of the acid, which is 9.00 M.

In order to determine the molarity of the acid, we will use the equation:

H3PO4(aq) + 3NaOH(aq) → Na3PO4(aq) + 3H2O(l)

From the equation, we can see that the mole ratio between H3PO4 and NaOH is 1:3. Since 50.0 mL of 1.50 M NaOH was required to neutralize the 25.0 mL sample of H3PO4, we can calculate the moles of NaOH used:

Moles of NaOH = 1.50 M x 0.0500 L = 0.0750 mol

Since the mole ratio between H3PO4 and NaOH is 1:3, we can calculate the moles of H3PO4:

Moles of H3PO4 = 3 x 0.0750 mol = 0.225 mol

Finally, we can calculate the molarity of the acid by dividing the moles of H3PO4 by the volume of the sample:

Molarity = Moles/Volume = 0.225 mol/0.0250 L = 9.00 M

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Answer:

well she can test both of the soap by putting one on and plate and another on the other plate and which ever is cleaner is your answer

Answer:

Y³⁻  A non metal that gained three electrons.

V²⁺ A metal that lost two electron

Z²⁻ A non metal that gained two electrons

X³⁺ A metal that lost three electrons

Explanation:

Metals lost the electrons and form cation

while non metals gain the electrons and form anion.

Y³⁻

c) A non metal that gained three electrons.

Non metal gain three electrons and form anion with the charge of -3.

V²⁺

a) A metal that lost two electron

A metal lost two electrons and form cation with charge of +2.

Z²⁻

d) A non metal that gained two electrons

A non metal that gained two electrons and form anion with charge of -2.

X³⁺

b) A metal that lost three electrons

A metal that lost three electrons and form cation with charge of +3.

Y³⁻  A non metal that gained three electrons.

V²⁺ A metal that lost two electron

Z²⁻ A non metal that gained two electrons

X³⁺ A metal that lost three electrons

Answer:

Explanation:

8) As a sulfur atom gains electrons, its radius

A) decreases

B) increases

C) remains the same

Answer:

Increases

Explanation:

when an atom form ion its atomic radius changed from neutral atomic radius.

if the atom form cation its atomic radius is smaller than neutral atomic radius.

If atom form anion its anionic radius is larger than the neutral atomic radius.

The reason is that when electron is remove energy shell deduced so cation get smaller ionic radii while in case of anion electron is added and size increase.

when sulfur gain electrons it form anion that's why its radius increases.

9) Which element forms an ion larger than its atom?

A) Na B) Ne C) Ba D) Br

Answer;

Br

Explanation:

when an atom form ion its atomic radius changed from neutral atomic radius.

if the atom form cation its atomic radius is smaller than neutral atomic radius.

If atom form anion its anionic radius is larger than the neutral atomic radius.

The reason is that when electron is remove energy shell deduced so cation get smaller ionic radii while in case of anion electron is added and size increase.

In given list of elements sodium and barium form cation while bromine form anion.

That's why anion of bromine is larger than atom.

while neon is inert it cannot form ion.

10. Which of the following particles has the smallest

radius?

A) Na B) K° C) Na+ D) K+

Answer:

Na⁺

Explanation:

Atomic radii trend along group:

As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased .

Sodium and potassium are present in group one. Sodium is present in period three while potassium is present in period four. So atomic size of sodium is smaller and when it form the cation its cation is smaller than its atom because of losing of electron.The reason is that when electron is remove energy shell deduced so cation get smaller ionic radii

To calculate an object's density, you need to know its mass and volume. Mass measures the total quantity of matter, and volume measures the space it occupies. Density is found by dividing mass by volume.

To calculate the density of an object, you need to know two specific quantities: mass and volume. Mass is a measure of the total quantity of matter in the object and is often measured in grams or kilograms. Volume, on the other hand, is a measure of the space occupied by the object, which can be measured in cubic centimeters, liters, or other units of volume. Density is then calculated by dividing the mass by the volume of the object. Therefore, knowing the space it occupies and the total quantity of matter is essential for calculating density.

Answer:

A.  begin with hydrogen; pair a metal with a hydroxide ion

Explanation:

Acid can be distinguished from base on the basis of formulas in such a way that acid formula start with hydrogen.

For example:

Hydrochloric acid is strong acid. Its formula is HCl.

It start with hydrogen

Sulfuric acid is acid. Its formula is H₂SO₄

it is also start with hydrogen.

Base:

Base is distinguish from acid in such a way that in base formula metal is pair with hydroxide ion.

For example:

Sodium hydroxide is base. Its formula is NaOH.

sodium is metal while OH is hydroxide ion.

Potassium hydroxide is base. its formula is KOH.

potassium is metal and OH is hydroxide ion.

Answer:

Electron Configuration and Oxidation States of Neon. Electron configuration of Neon is [He] 2s2 2p6. Possible oxidation states are 0. so the answer is 0.

Explanation:

The base ionization constant expression for ammonia is represented as NH3(aq) + H₂O(l) ⇌ NH4+(aq) + OH¯(aq). The ionization constant, Kb, can be calculated using the formula Kb = [NH4+][OH-] / [NH3]. This is important for understanding ammonia's behavior in various reactions and solutions.

The base ionization constant expression for ammonia (NH3), a weak base, is represented as follows: NH3(aq) + H₂O(l) ⇌ NH4+(aq) + OH¯(aq). In this case, the equilibrium of the ionization reaction of ammonia with water results in an ammonium ion (NH4+) and a hydroxide ion (OH-).

The ionization constant for this base is denoted as Kb. The specific value of Kb for ammonia can be found in tables of ionization constants for weak bases or calculated using the formula Kb = [NH4+][OH-] / [NH3], where the square brackets denote the equilibrium concentrations of the respective species.

The ionization of ammonia in water is a fundamental concept in acid-base chemistry and is vital for understanding its behavior in various chemical reactions and solutions.

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Answer:

The mouse Eats plants that use the sun as a food source

Explanation:

An owl indirectly captures sun's energy by consuming a mouse, which has fed on plants that perform photosynthesis, illustrating energy transfer through a food chain.

An owl captures energy from the sun indirectly by eating a mouse. This process begins with plants using photosynthesis to convert solar energy into chemical energy stored within carbohydrate molecules. A mouse then eats these plants, and the energy from the plants is used to fuel the mouse's body. When an owl eats the mouse, it obtains this energy and transforms it through biochemical reactions to sustain its own life processes. This sequence illustrates energy transfer through a food chain, with the sun as the original energy source.

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Answer:

d = 3.5 g/cm³

Explanation:

Density:

Density is equal to the mass of substance divided by its volume.

Units:

SI unit of density is Kg/m3.

Other units are given below,

g/cm3, g/mL , kg/L

Formula:

D=m/v

D= density

m=mass

V=volume

Symbol:

The symbol used for density is called rho. It is represented by ρ. However letter D can also be used to represent the density.

Given data:

Mass of diamond = 5.6 g

Volume = 1.6 cm³

Density = ?

Solution:

d = m/v

d = 5.6 g/ 1.6 cm³

d = 3.5 g/cm³

Answer:

The catalyst speeds up the chemical reaction.

Explanation:

The process in which chemical reaction rate increases by addition of substance is termed as a catalyst. The chemical reaction happens faster when a catalyst is present because it gives an alternative reaction pathway with lower activation energy.

The catalyst usually forms a temporary intermediate that helps in regenerating the original catalyst in the cyclic process. Yeast when added in a mixture work as a catalyst and helps with chemical reaction.

C

Ionic crystals are made from ions that are bonded together by ionic bonds. An example is salt crystals that are made of sodium and chloride ions.  

Explanation:

An ionic bond is formed when one atom donates electrons to another atom so they both attain stable electron configuration. The two atoms are then bound by their acquired charges. For example sodium atom2.8.1) donates its valence electrons to chlorine atom (2.8.7). They both achieve stable electron configuration of 2.8  and 2.8,8 respectively. Because sodium ion will now have a positive charge (because it has more protons than electrons) and chloride ion will have a negative charge because it has more electrons than protons, the two are bonded together electrostatically forming ionic bonds.

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Answer:

The answer is B, light energy is not required to proceed

Explanation:

I got it right on my assignment

Answer:

light energy

Explanation:

Answer: c. balance

Explanation: Mass is the amount of matter contained in a body.

Relative and average atomic mass both describe properties of an element related to its different isotopes. Out of these two Relative atomic mas is more accurate. Therefore, the correct option is option B.

Mass defines the quantity of a substance. It is measured in gram or kilogram. Average mass is the mass of atoms of an element that are isotopes. It can be calculated by multiplying mass of a isotope to natural abundance of that isotope.

Average atomic mass = (mass of first isotope× percent abundance of first isotope)+(mass of second isotope× percent abundance of second isotope)

The relative mass is the mass that is with respect to mass of a matter that is considered as standard. In chemistry relative mass is equal to the mass of one-twelfth the mass of C-12 isotope . Balance is the tool that is used to measure mass.

Therefore, the correct option is option B.

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Answer:

47 degrees

Explanation:

Answer:

47 degrees is your answer

Answer:

C ) Cu(s) + 2AgNO3(aq)

Explanation:

A chemical reaction is represented by a chemical equation which show the reactant and products. Reactants are written on left side of arrow while products are written on right side. The number of atoms are remain same however arrangement of atoms is different on both side.

For example:

Cu(s) + 2AgNO3(aq) →   2Ag + Cu(NO3)2

In this reaction Cu and AgNO3 are reactants while Ag and Cu(NO3)2 are products.The number of atoms are same on both side however arrangement of atoms is different.

Answer: A & C

Explanation:

Answer:

When electrons move from a higher energy level to a lower one, photons are emitted, and an emission line can be seen in the spectrum. Absorption lines are seen when electrons absorb photons and move to higher energy levels. ... An atom in its lowest energy level is in the ground state.

In an emission spectrum when an electron moves from higher energy level to lower energy level it causes emission of radiant energy that produces characteristic spectral lines for a given element.

Emission spectrum is defined as a spectrum of a chemical compound or substance composed of frequencies of electromagnetic radiation. Radiations which are emitted while electron make transition from higher to lower energy level.

Energy of photon is equal to the difference between the two energy states . There are many possible electronic transitions in an atom and every transition has a specific wavelength.

Collection of different transitions with respect to different wavelengths makes up an emission spectrum.Emission spectrum of each element is unique and therefore spectroscopy is used to identify elements which are present in different substances.

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Answer:

A scandium-48 nucleus undergoes beta-minus decay to produce a titanium-48 nucleus.

[tex]\rm ^{48}_{21}Sc \to ^{48}_{22}Ti + ^{\phantom{1}\,0}_{-1}e^{-} + \bar{\mathnormal{v}}_e[/tex].

Explanation:

There are two types of beta decay modes: beta-minus and beta-plus.

In both decay modes, the mass number of the nucleus stays the same.

However, in a beta-minus decay, the atomic number of the nucleus increases by one. In a beta-plus decay, the atomic number decreases by one.

Each beta-minus decay releases one electron and one electron antineutrino. Each beta-plus decay releases one positron and one electron neutrino.

Look up the atomic number and relative atomic mass for the element scandium.

This question did not specify whether the decay here is beta-plus or a beta-minus. However, the relative atomic mass of this element can give a rough estimate of the mode of decay.

Each element (e.g, [tex]\rm Sc[/tex]) can have multiple isotopes. These isotopes differ in mass. The relative atomic mass of an element is an average  across all isotopes of this element. This mass is weighted based on the relative abundance of the isotopes. Its value should be closest to the most stable (and hence the most abundant) isotope.

The mass number of scandium-48 is significantly larger than the relative atomic mass of this element. In other words, this isotope contains more neutrons than isotopes that are more stable. There's a tendency for that neutron to convert to a proton- by beta-minus decay, for example.

The atomic number of the nucleus will increase by 1. [tex]21 + 1 = 22[/tex]. That corresponds to titanium. The mass number stays the same at [tex]48[/tex]. Hence the daughter nucleus would be titanium-48. Note that two other particles: one electron and one electron [tex]\rm e^{-}[/tex] and one antineutrino [tex]\bar{v}_{\text{e}}[/tex] (note the bar.) The neutrino helps balance the lepton number of this reaction.

The balanced equation for the transmutation that occurs when a scandium-48 nucleus undergoes beta decay is:[tex]\[ \ce{^48_21Sc - > ^48_22Ti + ^0_{-1}e} \][/tex]

  Beta decay is a type of radioactive decay in which a beta particle (an electron or a positron) is emitted from an atomic nucleus. In the case of scandium-48 [tex](\( \ce{^48_21Sc} \))[/tex], beta decay means that a neutron in the nucleus is converted into a proton, an electron (beta particle), and an electron antineutrino. The proton remains in the nucleus, increasing the atomic number by one, while the electron and antineutrino are emitted.

 The atomic number of scandium is 21, and after beta decay, the atomic number increases by one to become 22, which corresponds to the element titanium (Ti). The mass number (the total number of protons and neutrons in the nucleus) remains unchanged at 48 because a neutron is converted into a proton without any change in the number of nucleons.

 The symbol [tex]\( \ce{^0_{-1}e} \)[/tex] represents the beta particle, which is an electron. The charge of the electron is -1, and it has essentially no mass compared to a proton or neutron, hence the mass number being 0.

Therefore, the product of the beta decay of scandium-48 is titanium-48 [tex](\( \ce{^48_22Ti} \))[/tex], and the balanced equation includes the original nucleus, the resulting nucleus, and the emitted beta particle:

[tex]\[ \ce{^48_21Sc - > ^48_22Ti + ^0_{-1}e} \][/tex]

 This equation shows the conservation of mass and charge, which are fundamental principles in nuclear reactions. The mass number (48) is conserved, and the total charge is also conserved, with the scandium nucleus having a charge of +21, the titanium nucleus having a charge of +22, and the electron having a charge of -1, balancing the total charge before and after the decay.

Final answer:

The 2 products of photosynthesis are glucose and oxygen. Glucose acts as the food source for plants, while oxygen is a waste product necessary for animal life.

Explanation:

The 2 products of photosynthesis are glucose and oxygen. Glucose is the main product, which is a sugar that acts as the food source for plants. Oxygen is a waste product that is released into the atmosphere and is necessary for animal life to survive. Without photosynthetic organisms like plants, there wouldn't be enough oxygen in the atmosphere for animals to breathe.

“Reactants” must "collide" for a "chemical reaction" to proceed.

Option: B

Explanation:

Collision theory explains why collision of reactant is primary stage for any "chemical reaction" to take place. According to it “rate of reaction is proportional to the rate of reactants collisions”. Orientation of reacting species during collision is important to result into product, where atoms are bonded together. Adequate amount of energy is compulsory to allow mutual penetration of reacting species valence shells for rearrangement of electrons and allow formation of new bonds. While activated complex (which is unstable species) formation is transition state of chemical reaction having very short life and mostly undetectable.

Answer:

reactants only

Explanation:

Answer:

Aluminium alloys are used extensively in aircraft due to their high strength-to-weight ratio.

Explanation:

Answer:because it is light and cheap

Explanation:

Answer:

6.5 meters

Explanation:

Background Knowledge:

The most familiar example of breaking wave is the breaking of water surface waves on a coastline.

Explanation:

The process of Wave breaking in most of the cases occurs when the amplitude reaches the point that the crest of the wave actually overturns

Factors by which waves are produced:

Different type of waves are produced and varied according to different type of factors. These factors are

Wind direction

Type of swell

Sea floor features

Slope of sea bed

Direct answer of the question:

In general rule, Waves start to break on reaching a water depth of 1.3 times the wave height.

In this question wave height is 5 meters so wave breaks on

5 × 1.3 = 6.5 meters

Final answer:

Wave breaking occurs when a wave's particle velocity exceeds the velocity of the wave crest due to specific conditions. A wave with a height of 5 meters will start breaking when the depth of water decreases to a certain point. This understanding is vital for predicting wave behavior where it begins to break.

Explanation:

Wave breaking occurs when a wave's particle velocity exceeds the velocity of the wave crest, typically at a crest angle of about 120°.

In the case of a wave height of 5 meters, when the depth of water decreases to the point where the wave celerity is exceeded, the wave will begin to break.

Understanding the relationship between wave height, water depth, and wave-breaking is crucial in predicting where waves will start breaking.

Answer:

The number of energy levels increased atomic radius also goes to increase.

Explanation:

Atomic radius  trend along period.

As we move from left to right across the periodic table the number of valance electrons in an atom increase. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases because it is very difficult to remove the electron from atom and more energy is required.

Atomic radii trend along group:

As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next energy level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.

The number of energy levels in an atom affects its radius. Moving down a group increases the energy levels and atomic radius, while moving across a period increases the effective nuclear charge and decreases the atomic radius.

The number of energy levels in an atom has an effect on its radius. As we move down a group in the periodic table, the number of energy levels increases, leading to an increase in the atomic radius. As we move across a period, the number of energy levels remains the same, but the effective nuclear charge experienced by the electrons increases. This causes the electrons to be pulled in tighter to the nucleus and results in a decrease in the atomic radius.

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Answer:

c,interpretation of the data

Explanation:

A good scientific explanation needs to be based on both data collected in an investigation and on the ability to interpret what the data means.

Normally, adding heat energy increases the temperature of a substance. However, during a phase change, the temperature of the substance stays constant. This happens because the heat energy is being used to change the phase of the matter instead of the temperature.

Answer:

The temperature of the water stayed at [tex]100^{0} C[/tex] because the temperature of a pure water does not increase at its boiling point, [tex]100^{0} C[/tex]. This is due to latent heat of vaporisation.

Explanation:

During a change of state of a substance, the temperature does not change due to latent heat of the substance. Latent heat is the amount of heat required to convert a unit mass of a substance from one state to another without a change in its temperature. There are two types of latent heat, latent heat of fusion anf latent heat of vaporisation.

So during the experiment, the water got to its boiling point and continues to boil at this constant temperature until it would change completely to steam at that temperature. After the conversion process, the temperature begins to increase.

The latent heat of vaporisation came into action during the process of boiling the water at constant temperature. That's why the temperature of the water did not increase even after reaching its boiling point ([tex]100^{0} C[/tex] ).

Answer:

2C(s) + 3H2(g) --> C2H6(g)

Answer: 2C(s) + 3H2(g) = C2H6(g)

Explanation:

In balancing chemical equations, the reactant must be equal to the product. I.e law of conservation of matter must hold.

2 moles of carbon would react with 3 moles of hydrogen to give 1 mole of methane

2C(s) + 3H2(g) = C2H6(g)

Answer:

Reactants

Explanation:

"Starting chemicals", the substances present before a reaction occurs, are called reactants.

The results of the reaction are called products, which you would also have 15.0g.