Which of the following is the first stage of the photo-independent reaction?

carbon cycle
carbon fixation
carbon sink
carbon source

Radiation science is deadly to humans/ living organisms because it can cause damage to our cells and cancer.

Explanation:

Answer:

Fluorine, chlorine, bromine and iodine are grouped together because they have the same number of valence electrons.

Explanation:

Fluorine, chlorine, bromine and iodine are all found in group 7, which is the second-last column from the right. Group 7 elements are also called the "Halogens" family.

The group number also tells you the number of valence electrons that the elements have in that group. Valence electrons mean the outermost electrons (See picture).

For example, fluorine has two shells (the circles with dots on them). The outermost electrons, or valence electrons, are the dots on the biggest circle. There are 7 dots, so there are 7 valence electrons, which corresponds with Group "7".

A full shell (except the for first shell) is when there are 8 dots. Since 7 is so close to 8, Halogens are very reactive.

Fluorine, chlorine, bromine and iodine all have 7 valence electrons and are in the Halogens family, which are very reactive.

The elements fluorine, chlorine, bromine, and iodine are grouped together because they belong to the same group on the periodic table and share similar chemical properties.

The elements fluorine, chlorine, bromine, and iodine are grouped together because they belong to the same group on the periodic table.

These elements are part of Group 17, also known as the halogens. They share similar chemical properties due to having the same number of valence electrons.

For example, they all have seven valence electrons, which allows them to easily gain one electron to achieve a stable electron configuration like the noble gas neon.

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Answer:

18098

Explanation:

The momentum of the object is 1500 kgm/s.

The law of conservation of momentum states that without effect of any external force in the system, the momentum of the system remains conserved. And momentum is defined as the product of the mass and velocity of the object.

Here, the mass of the 1st body = 200kg.

The mass of the 2nd body = 150kg.

Velocity of the 1st body = 15 m/s.

Velocity of the 2nd body = - 10 m/s.

So, the total momentum of the system before collision = [tex]200\times15 + 150\times{-10[/tex] kgm/s

= 1500 kgm/s.

After the collision, the body sticks together.

So, the total mass =200+150 kg = 350 kg.

Momentum remains conserved. So the momentum of the body= 1500 kgm/s.

D. Even though the temperature is the same, container B has more thermal energy, since it has more liquid than container A.

Explanation:

Whenever there is an increase in the volume of the pink liquid, it is due to the increase in temperature.

When the temperature increases, the molecules move farther apart as much as possible.

When the molecules moves apart from each other and collide with each other, so that its kinetic energy also increases, So thermal energy of the container B is more compared to the container A.

Final answer:

Container B has more thermal energy because it holds more liquid than container A, resulting in more total kinetic energy among its molecules, despite both containers having the same temperature.

Explanation:

The correct answer to the student's question is D. Even though the temperature is the same, container B has more thermal energy since it has more liquid than container A. Thermal energy depends on both the temperature of the liquid and the amount of substance that is present. In this case, despite having the same temperature, the larger volume of liquid in container B contains more molecules. Each molecule possesses a certain amount of kinetic energy due to its movement, so more molecules mean more total kinetic energy, which results in higher thermal energy. It's important to note that thermal energy is an extensive property; it depends on the amount of matter, so the more liquid there is (assuming everything else is constant), the more thermal energy there will be.

Answer:

Smaller; products; products  

Explanation:

aA  + bB ⇌ cC + dD

[tex]K_{\text{eq}} = \dfrac{\text{[C]}^{c}\text{[D]}^{d}}{\text{[A]}^{a}\text{[B ]}^{b}}\\\\\text{When the $K_{\text{eq}}$ is large, the number representing [A]$^{a}$[B ]$^{b}$ must be $\textbf{smaller}$ than the}\\\text{number representing [C]$^{c}$[D]$^{d}$. This relationship means that the $\textbf{products}$ must be favoured}\\\text{and that the mixture at equilibrium is largely $\textbf{products}$.}[/tex]

Answer:

it's criminal justice

Explanation:

Forensic science, also known as criminalistics, is the application of science to criminal and civil laws.

Forensic science is the application of science to B. Criminal Justice.

Forensic science is a multidisciplinary field that applies scientific principles and techniques to solve crimes and aid the criminal justice system. It encompasses various specialties, including DNA analysis, fingerprint examination, ballistics, and toxicology, helping investigators gather evidence, identify suspects, and ensure justice is served in criminal cases.

It involves the use of scientific methods and techniques to examine and analyze evidence in criminal investigations. Forensic scientists apply their knowledge in disciplines such as biology, chemistry, physics, and even mathematics to help solve crimes and provide evidence in legal proceedings.

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A mineral is defined by its crystalline structure, solid state, naturally occurring and inorganic nature, and definite chemical composition. Therefore, 'a variable chemical composition' is not a characteristic of a mineral. The correct option is: D.

To determine which factor is not a characteristic of a mineral, we need to understand the key properties that define a mineral.

A mineral is characterized by the following:

Given this definition, the correct answer to the question is:

Minerals have a definite chemical composition, which makes option D incorrect.

Answer:

1.  Dipoles

2. London Dispersion

3. weaker

4. long distances

5.easy

Explanation:

When hot magma cools, igneous rocks are formed.

b) When graphite is under higher pressure and heat, it becomes diamond.

c) Igneous rocks include pumice and granite and can be formed above Eath's surface.

d) Metamorphic rocks are formed when existing rocks are changed inside Earth.

Magma is the molten rocks that is found inside Earth’s surface. Its the lava that is stored inside the Earth’s surface. This magma formes out of the Earth's surface during a volcanic eruption, or cools inside the Earth's surface itself to form igneous rock.

Graphite and diamond both are the allotropes of carbon. This is the change in allotropes which can occur in extreme cases of temperatures or pressure which can occur inside the Earth’s surface. This can change graphite to diamond.

Igneous rocks which are externally formed are pumice or basalt which forms when lava comes out of Earth's interior and cools to form rock. Whereas the Igneous rocks like granite are formed when the magma cools inside the Earth’s surface due to cooling of lava.

Metamorphic rocks are formed when the Igneous or sedimentary rocks undergoes conditions of severe temperature or pressure from inside the Earth's surface and the structure of the rock fully changes. This is how the metamorphic rocks form.

Answer:

a) When hot Magma cools, igneous rocks are formed.

b) When Graphite is under higher pressure and heat, it becomes diamond.

c) Igneous rocks include pumice and granite and can be formed above Earth's surface.

d) Metamorphic rocks are formed when existing rocks are changed inside Earth.

Explanation:

Answer:

it is 10

Explanation:

Answer:

10

Explanation:

Answer:

Directly  

Explanation:

[tex]\dfrac{V}{T} = k[/tex]

If V increases, then T must also increase to keep the same ratio.

If V decreases, then T must also decrease to keep the same ratio.

V and T are directly proportional, because a change in one always causes a change in the other and the changes are in the same ratio. The constant k is called the proportionality constant.

Answer:

139.67 (J/kgk)

Explanation:

Given data:

mass of mercury = m = 0.45 Kg

Amount of energy = Q = 257 J

Increase in the temperature = ΔT = 4.09 K

To find:

Specific heat capacity = C

Formula:

By using specific heat equation,

Q =  m x C  X  ΔT

C =  Q  /  m  x  ΔT

   = 257J  /  o.45 kg  x  4.09K

   = 257J  / 1.84

    = 139.67 (J/kgk)

Specific heat of mercury is 139.67 (J/kgk).

The question is incomplete, complete question is :

For the following chemical reaction, what mass of sodium chromate in grams will be needed to produce 5.17 mol of sodium nitrate?

[tex]2AgNO_3 + Na_2CrO_4\rightarrow Ag_2CrO_4 + 2NaNO_3[/tex]

Answer:

418.77 grams of sodium chromate is needed to produce  5.17  mol es of sodium nitrate.

Explanation:

[tex]2AgNO_3 + Na_2CrO_4\rightarrow Ag_2CrO_4 + 2NaNO_3[/tex]

According to reaction, 2 moles of sodium nitarte is obtained from 1 mole of sodium chromate .

Then 5.17 moles of sodium nitarte will be obtained from :

[tex]\frac{1}{2}\times 5.17 mol=2.585 mol[/tex] of sodium chromate

Mass of sodium chromate :

[tex]2.585\times 162 g/mol=418.77 g[/tex]

418.77 grams of sodium chromate is needed to produce  5.17  mol es of sodium nitrate.

Answer:

A) Cl2; 1.81:1

Answer:

- is reused and recycled

- can dissolve more substances than any other liquid

Explanation:

Earth water is reused and recycles in the form of the water cycle (hydrological cycle). In this cycle, water from the earth surface evaporates in the atmosphere, cool and condense into cloud or snow and fall to the earth surface.

As a universal solvent, water can dissolve more substances than any other liquid. The polar arrangement of oxygen and hydrogen atom in the water molecules makes it excellent salt.

On Earth, ~2.5% is a freshwater whereas 97.5% is salt water. The pH of water differs for surface and salt water, i.e. neutral to alkaline respectively. Water molecules attract to other water molecules better than the other substances. Therefore, other options are incorrect.

Answer:

recycled and reused

strongly attracted to itself  

not attracted to other materials

easily dissolved in other liquids

Explanation:

Answer:

                    Polyatomic Ionic Compound

Explanation:

                     In given statement the compound given is called as Sodium oleate this means that when Oleic acid is treated with NaOH then it forms.

                     In chemistry there are few species which are involved in the formation of compounds.

  (i) Atoms:

                  It is very common that atoms of different elements combine to form compound through covalent bond. For example, H₂, O₂, N₂, F₂ e.t.c.

   (i) Ions:

                  Other than covalent compounds we have ionic compounds. Ionic compounds are made up of ions. These ions forming the ionic compounds can be monatomic like Na⁺, Br⁻, Mg²⁺, Al³⁺, N⁻³ or they can be polyatomic like CO₃²⁻, SO₄²⁻, NH₄⁺, PO₄³⁻ e.t.c.

    (iii) Polyatomic Ions:

                                     In polyatomic ions we find a charge on a molecule which contains two or more atoms bonded covalently. Hence, in given compound we have a long chain of molecule containing a negative charge neutralized by opposite +ve charged sodium ion. Hence, Sodium oleate is a polyatomic ionic compound.

Answer:

225000

N/m

Explanation:

Final answer:

The spring constant is 5 N/cm.

Explanation:

The equation for elastic potential energy is given as:

U = 1/2kx^2

Where:

In this case, we are given that the elastic potential energy is 45 J and the displacement is 2 cm. Substituting these values into the equation, we get:

45 J = 1/2k(2 cm)^2

Simplifying, we find:

45 J = 2k cm^2

Solving for k, we divide both sides by 2(2 cm)^2:

k = 45 J / 2(2 cm)^2

k = 5 N/cm

Therefore, the spring constant is 5 N/cm.

Answer:

protons

Explanation:

Answer:

108 N

Explanation:

F = m × a

Force equals mass × acceleration, for more you can see Newton's second law.

Answer:

                     M.Mass  =  3.66 g/mol

Data Given:

                  M.Mass  =  M = ??

                  Density  =  d  =  0.1633 g/L

                  Temperature  =  T  =  273.15 K (Standard)

                  Pressure  =  P  =  1 atm (standard)

Solution:

              Let us suppose that the gas is an ideal gas. Therefore, we will apply Ideal Gas equation i.e.

                                             P V = n R T    ---- (1)

Also, we know that;

                       Moles  =  n  =  mass / M.Mass

Or,                                   n  =  m / M

Substituting n in Eq. 1.

                                             P V = m/M R T   --- (2)

Rearranging Eq.2 i.e.

                                             P M = m/V R T   --- (3)

As,

                     Mass / Volume = m/V = Density = d

So, Eq. 3 can be written as,

                                             P M = d R T

Solving for M.Mass i.e.

                                             M = d R T / P

Putting values,

M  =  0.1633 g/L × 0.08205 L.atm.K⁻¹.mol⁻¹ × 273.15 K / 1 atm

M  =  3.66 g/mol

Answer:

x = 5

Because 12 + 13 = 5x

25 = 5x

x = 5

Answer:

5

Explanation:

Mary had 5 dollars she owe her friend Mia 13 dollars but she didn't have enough. so multiply how much she has to give to mia

Answer:

[tex]\frac{p_1 V_1}{T_1}=\frac{p_2 V_2}{T_2}[/tex]

Explanation:

The equation of state (combined gas law) for an ideal gas states that

[tex]pV=nRT[/tex]

where

p is the gas pressure

V is the volume of the gas

n is the number of moles of the gas

R is the gas constant

T is the absolute temperature of the gas

The equation can be rewritten as

[tex]\frac{pV}{T}=nR[/tex]

For an ideal gas that undergoes a transformation, if the amount of gas remains the same, the term on the right of the equation remains constant. This means that the ratio

[tex]\frac{pV}{T}[/tex]

for the gas remains constant, and therefore we can rewrite the equation as

[tex]\frac{p_1 V_1}{T_1}=\frac{p_2 V_2}{T_2}[/tex]

where 1 indicates the initial conditions of the gas while 2 indicates the conditions of the gas after the transformation.

Answer:

f

ExplaOV, T = P₂72

natifon:

The energy is generally not needed immediately, so it is used to combine ADP with phosphate ions to form ATP molecules. During the process of cellular respiration, carbon dioxide is given off as a waste product. This carbon dioxide can be used by photosynthesizing cells to form new carbohydrates.

Answer:

w

Explanation:

Answer: Carlos Slim becomes the first Mexican and person from an emerging economy to top Forbes Richest Person list, with net worth of US$53.5 billion

Answer:

B

Explanation:

The others are alloys and therefore do not appear on the periodic table

Lead is the correct answer as it is an element, which is a pure substance made up of one type of atom, unlike bronze, brass, and steel, which are alloys.

When asked which of the following is a pure substance made up of one type of atom, the correct answer is B) lead. An element is defined as a pure substance that cannot be broken down into simpler substances by chemical means and consists of one type of atom. Therefore, lead, which is an element, fits this description perfectly.

It's important to note that, unlike lead, bronze, brass, and steel are alloys, which are mixtures of two or more elements, with at least one being a metal. Bronze is an alloy of copper and tin, brass is an alloy of copper and zinc, and steel is an alloy typically made of iron and carbon. Each of these is not a pure substance because they contain more than one type of atom.

When iron melts in 912 degrees Celsius, in starting the atoms of the iron become more packed and then in 1,394 degrees Celsius, the atoms loose again and melts.

Melting is a process by which the substance that is in solid starts to become liquid. The changing of the solid into liquid is called melting. Usually in high temperature, the substance starts to melting.

Thus, when iron melts in 912 degrees Celsius, in starting the atoms of the iron become more packed and then in 1,394 degrees Celsius, the atoms loose again and melts.

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Answer:

Explanation:

Chemical reactions involve the transformation of substances, called reactants, by breaking some bonds and forming new bonds, to obtain different substances called the products.

In the chemical reactions the atoms of the reactants are rearranged giving rise to the products, which will contain the same atoms but bonded differently or even as separate elements.

Using chemical reactions the human being can, for example, produce chlorine from sodium chloride solutions (from the oceans). In the same reaction, caustic soda (sodium hydroxide, NaOH) and hydrogen gas (H₂), are produced as by-products.

The properties of the products of a chemical reaction are very different from those of the reactants: sodium chloride is consumed by the humans every day in almost every meal, while chlorine and caustic soda are lethal if human beings consume them in some way.

Some examples of the variety of products produced from chemical reactions include:

The list could be huge, because most of the things that the human being use are manufactured using chemical reactions.

Neils Bohr

Development of the Atomic Theory. In 1913, Neils Bohr, a student of Rutherford 's, developed a new model of the atom. He proposed that electrons are arranged in concentric circular orbits around the nucleus. This model is patterned on the solar system and is known as the planetary model.

Answer: Neils Bohr

Explanation:  In 1913, Neils was a student of Rutherford 's. He developed a new model of the atom. He explained that electrons are orignized in concentric circular orbits around the nucleus. This model is patterned on the solar system and is known as the planetary model.

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Answer:

Molar mass of Na2HPO4=141.96, of Na2HPO4. 12H2O = 358.14: so to get the same 0.4 M: 28.65/358.14*141.96 g, add water until you reach 200ml , dissolve all solid and then filter to make sterile.

Explanation:

141g/mol is the molecular mass of Na[tex]_2[/tex]HPO[tex]_4[/tex].  It is also known as molecular weight. It is computed by multiplying the mass of every atom.

The quantity of mass associated with such a molecule is referred to as its molecular mass. It is also known as molecular weight. It is computed by multiplying the mass of every atom by the amount of atoms from the element in the molecule. Water, for example, is composed of two hydrogen atoms and one oxygen atom.

The total of the atomic weight of the atoms within a molecule yields the molecule's molecular mass. The molecular mass expresses the mass of such a molecule in relation to the mass of both the 12C atom, which itself is assumed to be 12.

Molecular mass = Molar mass of sodium×2+ molar mass of hydrogen + molar mass of phosphorus+ 4 molar mass of oxygen

Molecular mass = 23×2+1 + 30+ 4× 16=141g/mol

Therefore, 141g/mol is the molecular mass of Na[tex]_2[/tex]HPO[tex]_4[/tex].

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