Why would the presence of oxygen bubbles be a good indicator of photosynthesis occurring?

Answer:

Ture

Explanation:

Ture

True

True

True

Answer:

1. B. Ammonia and hexane will not dissolve because one molecule is polar and the other is non polar.

2. 1400 mL

Explanation:

In chemistry, like dissolve like! Ammonia is a polar molecule having a significant dipole moment owing to its three N-H bonds. On the other hand, hexane is a purely non-polar hydrocarbon hence the two substances can never dissolve in each other.

From the dilution formula;

C1V1=C2V2

C1= Initial concentration of the solution

V1 = Initial volume of the solution

C2 = Final concentration of the solution

V2= Final volume of the solution

2.8 M * 750.0 mL = 1.5 M * V2

V2 = 2.8 M * 750.0 mL/1.5 M

V2 = 1400 mL

Answer:

3, 2

Explanation:

Balanced equation:

N2 + 3 H2 = 2 NH3

Answer:

S + 4 Cl2

Explanation:

Sulphur - S

1 mol of Sulphur = S

Chlorine = Cl2

4 moles of Chlorine = 4Cl2

4S + 2Cl2

Incorrect option

S + 4 Cl2

Correct option

S + 2Cl2

Incorrect option

S + Cl2

Incorrect option

The theoretical yield is 6 sapphire rings.

This is the total product formed as a result of the complete conversion of

the reactants. In this scenario, the reactant is the 12 sapphires in which 2

of it is needed to produce one sapphire ring.

This however translates to the theoretical yield being 6 sapphire rings

which is gotten by:

2 sapphires = 1 ring

12 sapphires = x

Cross multiply

2x = 12

x= 12/2 = 6 sapphire rings.

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Answer: the answer is 12M

Explanation: 3.0mol/ 0.25L =12M

12M is the molarity of a solution made from dissolving 3.0 moles of Saline (NaCl) in 0.25 L of solution.

The amount of molecules of molecules divided by the quantity of liters in solution is the definition of molarity, a concentration unit in chemistry. It is crucial to comprehend how it is calculated as well as when to employ it in comparison to other units because it is among the most widely used concentration units.

A chemical solution's concentration is measured in molarity (M). It refers to the solute's moles per liter of solution. To be clear, this is not the same as the liters of solvents (a common mistake).

molarity = number of moles of solute/ volume of solution in litre

molarity =3.0mol/ 0.25L

             =12M

Therefore, 12M is the molarity of a solution made from dissolving 3.0 moles of Saline (NaCl) in 0.25 L of solution.

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Answer:

Natural phenomena such as melting glaciers is due to the rise in temperature. This will result to extinction of flora and fauna. Moreover it can cause extreme flooding due to rise in water level in other water bodies such as rivers, lakes

Answer:

Gas

Explanation:

I dunno but a lucky guess i guess

Answer:

In the middle of the forest.

Explanation:

They have to bury the remains in the middle of the forest at the Forensic Osteological Research Center in order to study the decomposition of the dead person. By studying the decomposition of dead person we can get a lot of information which can be used in the study of criminal cases and solving of crimes. The middle place in the forest is a perfect place to bury the remains due to presence of huge amount of microbes as well as insect that helps in the decomposition.

Answer:

Granite

Explanation:

Answer:

Granite

Explanation:

Igneous forms when rock is cooled and hardens by Magma.

And the option granite, which forms as magma cools deep underground

Hope it helps have a Good Day

Answer:

a) 226.6 grams of Cl₂

b) 19.2 grams of C

c) 303.2 grams of TiCl₄ and 70.4 grams of CO₂

Explanation:

The balanced chemical reaction is the following:

TiO₂(s) + C(s) + 2 Cl₂(g) → TiCl₄(s) + CO₂(g)

(a) What mass of Cl₂ gas is needed to react with 1.60 mol TiO₂?

From the chemical equation, 1 mol of TiO₂ reacts with 2 moles of Cl₂. So, the stoichiometric ratio is 2 mol Cl₂/1 mol TiO₂. We multiply this ratio by the moles of TiO₂ we have to calculate the moles of Cl₂ we need:

1.60 mol TiO₂ x 2 mol Cl₂/1 mol TiO₂ = 3.2 mol Cl₂

Now, we convert from moles to mass by using the molecular weight (MW) of Cl₂:

MW(Cl₂) = 35.4 g/mol x 2 = 70.8 g/mol

mass of Cl₂= 3.2 mol x 70.8 g/mol = 226.6 g

Therefore, 226.6 grams of Cl₂ are needed to react with 1.6 mol of TiO₂.

(b) What mass of C is needed to react with 1.60 mol of TiO₂?

From the chemical equation, 1 mol of TiO₂ reacts with 1 moles of C(s). So, the stoichiometric ratio is 1 mol C/1 mol TiO₂. We multiply this ratio by the moles of TiO₂ we have to calculate the moles of C(s) we need:

1.60 mol TiO₂ x 1 mol C(s)/1 mol TiO₂ = 1.60 mol C(s)

So, we convert the moles of C(s) to grams as follows:

MW(C) = 12 g/mol

1.60 mol x 12 g/mol = 19.2 g C(s)

Therefore, a mass of 19.2 grams of C is needed to react with 1.60 mol of TiO₂.

(c) What is the mass of all the products formed by reaction with 1.60 mol of TiO₂?

From the chemical equation, we can notice that 1 mol of TiO₂ produces 1 mol of TiCl₄ and 1 mol of CO₂. So, from 1.60 moles of TiO₂, 1 mol of each product will be produced:

1 mol TiO₂/1 mol TiCl₄ ⇒ 1.60 mol TiO₂/1.60 mol TiCl₄

1 mol TiO₂/1 mol CO₂ ⇒ 1.60 mol TiO₂/1.60 mol CO₂

Finally, we convert the moles to grams by using the molecular weight of each compound:

MW(TiCl₄) = 47.9 g/mol Ti + (35.4 g/mol x 4 Cl) = 189.5 g/mol

1.60 mol x 189.5 g/mol = 303.2 g

MW(CO₂) = 12 g/mol C + (16 g/mol x 2 O) = 44 g/mol

1.60 mol x 44 g/mol = 70.4 g

Therefore, from the reaction of 1.60 mol of TiO₂ are formed 303.2 grams of TiCl₄ and 70.4 grams of CO₂.

It's the eye because it's the organ of sight

Answer:

Explanation:  A conversion factor is a number used to change one set of units to another, by multiplying or dividing. When a conversion is necessary, the appropriate conversion factor to an equal value must be used. For example, to convert inches to feet, the appropriate conversion value is 12 inches equal 1 foot.

Answer:

HCI - BASE

KOH - ACID

H2SO4 - ACID

H30 + :- BASE

NAOH - ACID

Bohr: Electrons move in circular paths that have different energies.

Thomson: Atoms contain electrons.

Dalton: Matter is made up of indivisible atoms.

Schrodinger and others: Electrons exist in a cloud of probability.

Rutherford: The mass of an atom is concentrated in its center.

Answer:

The screenshot shows all the answers

Explanation:

Answer:

2 FeCl2 + Cl2 -> 2 FeCl3

According to numbers in reaction

Amount of Cl2 is half of FeCl2

Explanation:

Molality = moles of solute/mass (in kg) of solvent

The solute here is NaCl, of which you have 40 g or 40/58.4428 = 0.6844 moles NaCl.

The solvent here is water, of which you have 1500 g or 1.500 kg H2O.

The molality of the resulting solution would thus be 0.6844 moles NaCl/1.500 kg H2O = 0.4562 mol/kg.

If you have to consider sig figs, then your final answer would have one sig fig (40 g has one sig fig). In that case, your final answer would be 0.5 mol/kg.

I think the answer is: C. An endothermic reaction that decreases in entropy

An endothermic reaction that decreases in entropy. Hence, option C is correct.

Entropy is the energy of a system that is unuseful to do work.

For a reaction to be spontaneous, the Gibbs' Free Energy must be negative.

The equation for Gibbs Free energy is given by:

G= H-TS

Where, G = Gibbs free energy

H = Enthalpy of the reaction

T = Temperature of the system

S = Entropy of the system

Sign convention for all the quantities:

For H: It is negative for exothermic reactions and positive for endothermic reactions

For S:  It is positive when there is an increase in entropy and it is negative when there is a decrease in entropy.

If we want G to be negative, the conditions necessary are:

G= (-ve) - (+ve) = -ve

The product of temperature and entropy must be positive and that will be positive when there is increase in entropy at any temperature.

Hence, option C is correct.

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Answer: B

Explanation: sorry if I'm too late but i just did this question and that was the right answer

Answer:

Cows and other ruminant animals (like goats and sheep) emit methane, a potent greenhouse gas, as they digest grasses and plants. This process is called “enteric fermentation,” and it's the origin of cows' burps.

Explanation:

Answer:

DONT CLICK THAT LINK THAT IS HACK AND VIRUS

Explanation:

Answer: 0.16 g H2

Explanation:

Mg+ H2SO4= MgSO4 + H2

Atomic massof Mg is 24

Molecular mass of H2 is 2

So,

24g Mg produce 2 g H2

1g Mg produce (2÷24)= 0.083 g H2

2.00g Mg produce (0.083×2) g H2

   = 0.16 g H2

 0.16g of hydrogen is formed when 2.00g of magnesium.

The mass of hydrogen gas formed when 2.00g of magnesium is equal to 0.165 g.

The chemical equation of a reaction is said to be a balanced equation when the number of atoms of substances is equal on either side of the equation.

Evergy balanced chemical equation must follow the law of conservation of mass according to which the total mass of the substances present on the reactant side should be equal to the total mass of substances present on the product side.

Given, the balanced chemical equation of the reaction of Mg and sulfuric acid:

[tex]Mg + H_2SO_4 \longrightarrow MgSO_4 +H_2[/tex]

One mole of magnesium produces hydrogen gas = 1mol

Given the mass of magnesium = 2g

The number of moles of Mg = 2/24.3 = 0.082 mol

Then the number of moles of hydrogen gas formed = 0.082 mol

The mass of the hydrogen gas = 0.082 × 2 = 0.165 g

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Answer: Calcium ion Ca² : 1 s² 2s² 2p ^6 (sorry I don't get 6 similar way as 2) 3s² 3p^6

Also 18 electrons, because Calcium donates two 4s electrons

Explanation:

Answer:

iron and carbon:steel:copper and tin: metal

Proton:

Positive

Found in Nucleus

Mass of 1 AMU

Neutron:

Neutral

Found in Nucleus

Mass of 1 AMU

Electron:

Negative

Found in orbitals

Mass of 0 AMU

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Answer and Explanation:

Dado que la capa de ozono protege la vida en la Tierra actuando como filtro de radiaciones nocivas del Sol, su destrucción trae como consecuencia un aumento de la radiacion UV que puede provocar:

- daños en animales y en el hombre: aumento de casos de cáncer de piel, cataratas en ojos, debilitamiento del sistema inmune.

- alteración en el desarrollo de especies vegetales .

- contribución al efecto invernadero y al calentamiento global.

Para revertir el deterioro de la capa de ozono, podemos tomar algunas medidas:

- no utilizar productos que contengan clorofluorocarbonos (CFC), como por ejemplo algunos aerosoles.

- evitar el uso de productos que contengan halones

- evitar el uso de hidrofluorcarbonos (HFCF)

Estos compuestos químicos reaccionan y destruyen el ozono, por lo que si evitamos utilizarlos, con el tiempo la capa de ozono se recuperará.

Answer:

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Answer: Hello, This is my most favorite class so I know this is right.

The most Reactive metal source is Copper.

Explanation:

This is the most reactive because it contains Lithium supplement.

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