calculate the number of moles in 2.5 particle NaOH
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Answer:

Explanation:

0.0

Answer:

Hi, There! the Correct Answer is below!

C.)interactions between humans and living and non-living things in the environment

Explanation:

Environmental scientists study subjects like the understanding of earth processes, evaluating alternative energy systems, pollution control and mitigation, natural resource management, and the effects of global climate change. ... Environmental scientists bring a systems approach to the analysis of environmental problems.

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Have a wonderful Day :)

~Darkspirit~

Answer:

interactions between human and living and non living things in the environment

Explanation:

Ammonia is produced by the reaction of nitrogen and hydrogen according to the equation

N2(g) + 3H2(g) → 2NH3(g)

Calculate the mass of ammonia produced when 27.0 g of nitrogen react with 12.0 g of hydrogen.

g NH3

Which is the excess reactant and how much of it will be left over when the reaction is complete?

Answer:

if its under 7 then it's an acid you neek over 7 is alkaline

oxide in a chemical reaction

CuFe2O4 are the products of combining iron (II) and Copper (II) oxide in a Chemical reaction.

The conversion of one or more chemicals into new one or more chemicals is called chemical reaction.

Example: iron reacts with oxygen to form rust.

The final substance of chemical reaction is called product.

Example: CuFe2O4 is the final substance called product when iron (II) and Copper (II) oxide react with each other.

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Answer:

d

Explanation:

it just makes alot of sense and you got this

Oxygen is a gas that belongs to the chalcogen family and is a reactive non-metal. It is an element, molecule, or pure substance. Thus, option A is correct.

A pure substance is defined as a substance that cannot be physically separated into its constituent particles. They are known to have a definite and constant chemical composition. It can be a molecule, element, or compound.

An element is atomic species that cannot be broken into simple sub-particles by chemical processes. On the other hand, if an atomic element bonds to the same or different atom it forms a molecule.

Oxygen gas is an element composed of two atoms of oxygen and is a molecule as the two atoms are linked chemically. It is also a pure substance as it contains the same element.

Therefore, option A. oxygen gas is a pure substance, an element, and a molecule.

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Answer:

MedlinePlus Drugs Information

Explanation:

Promethazine is in a class of medication called phenothiazines

Answer:A

Explanation:

Explanation:

Lithium sulfide

if my answer helps you than mark me as brainliest.

Answer:

D. Add acid to water, not water to acid

Answer:

50000 g

Explanation:

1 kilogram (kg) is equal to 1000 grams (g).

1 kg = 1000 g

The mass m in grams (g) is equal to the mass m in kilograms (kg) times 1000:

m(g) = m(kg) × 1000

Answer:

2.98 g CO2

Explanation:

1. Balance the chemical equation

1 Fe2O3 + 3CO ->  2Fe + 3CO2

2. Use periodic table to find mass from each CO2 and Fe2O3  

3. Calculate

3.60 g Fe2O3 x [tex]\frac{1 mol Fe2O3}{159.69 g Fe2O3}x\frac{3 mol CO2}{1 mol Fe2O3}[/tex] x[tex]\frac{44.01 g CO2}{1 mol CO2}[/tex] =  2.98 g CO2

The grams of CO, produced when 3.60 g of Fe 0 reacts with excess CO is 2.98 grams Co2.

Mass is the quantity of matter of a physical body.

The balanced equation is

[tex]\rm Fe_2O_3 + CO - > Fe + CO_2[/tex]

The calculation is

[tex]3.60 g \;Fe_2O_3 \times \dfrac{ 1 mol\;Fe_2O_3}{159.69} \times \dfrac{3 mol CO_2}{1 mol \;Fe_2O_3 } \times \dfrac{44.01\;CO_2}{1 mol\; CO_2} = 2.98 g\;CO_2[/tex]

Thus, the grams of CO, produced when 3.60 g of Fe 0 reacts with excess CO is 2.98 grams Co2.

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Answer:

Ba²+ (aq) + SO4²- (aq) --> BaSO4(s)

The net ionic equation for the formation of barium sulphate is Ba²⁺₍aq₎ + SO₄² ₍aq₎ → BaSO₄₍s₎. Therefore, option D is correct.

The inorganic substance having the chemical formula BaSO₄ is called barium sulfate. It is a tasteless, crystalline white substance that is insoluble in water. The main commercial source of barium and the materials made from it is the mineral barite, which is where it naturally occurs.

The use of barium sulfate aids in the diagnosis or discovery of issues with the esophagus, stomach, and bowels. It is a contrast material for radiography. To make the various bodily components clearly visible, contrast chemicals are used.

A barite-derived metallic compound with a silvery white color. In barium swallows and barium enemas, it is diluted with water to aid visualize the digestive tract on an x-ray.

Thus, option D is correct.

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Answer:

lost 2 electrons

Explanation:

A cation by definition is a positively charged ion. They are formed when a metal loses its electrons. A cation has more protons than electrons, giving it a net positive charge. So, it had to have lost 2 electrons to give it a positive charge of 2⁺.

Answer:

ज

Explanation:

ूअूिkzkzkksksosawwhsusisisisisisiisisisisisisiisisisis

Answer:

C. heat the substance to the boiling point.

Answer:

heat the substance

Explanation:

The Earth’s tilt changes its position relative to the stars and constellations as the Earth rotates around its axis.

Answer:

2NaOH + CO2 -> Na2CO3 + H2O

1) Find the moles of each substance

[tex]\eq n(NaOH)=\frac{35.0}{22.99+16.00+1.008\\}\ =\frac{35.0}{39.998} \ = 0.8750437522 moles\\n(CO_{2} ) = \frac{17.5}{12.01+32.00} = \frac{17.5}{44.01} = 0.3976369007 moles\\[/tex]

2) Determine the limitting reagent

[tex]\\NaOH = \frac{0.8750437522}{2} = 0.4375218761\\\\[/tex]

∴ Carbon dioxide is limitting as it has a smaller value.

3) multiply the limiting reagent by the mole ratio of unknown over known

n(H2O ) = 0.3976369007 × 1/2

             = 0.1988184504 moles

4) Multiply the number of moles by the molar mass of the substance.

m = 0.1988184504 × (1.008 × 2 + 16.00)

   = 0.1988184504 × 18.016

   = 3.581913202 g

Explanation:

The correct answer is = 3.581913202 g.

n(H2O ) = 0.3976369007 × 1/2

             = 0.1988184504 moles

  m = 0.1988184504 × (1.008 × 2 + 16.00)

      = 0.1988184504 × 18.016

      = 3.581913202 g.

H2O is the molecular formula of water, also called Dihydrogen monoxide. H2O symbolises two hydrogen atoms and one oxygen atom.

Water (H2O) is made from 2 atoms of hydrogen and 1 atom of oxygen. A mole of water molecules would be 2 moles of hydrogen atoms plus 1 mole of oxygen atoms. From the periodic table, we see the atomic weight of hydrogen is 1.0079 and the atomic weight of oxygen is 15.9994.

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The groups are alkali metals (I), alkaline earth metal (II) , Halogen (VII), and noble gases (VIII).

The representative elements, also known as the primary group elements, are found in Group A. As a result, the columns beginning with A (IA through VIIIA) are referred to as the primary group elements. The periodic table's columns were referred to as groups.

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Answer:

Not sure but I think it is C!

Explanation:

Thermometers are used to measure temperatures. The temperature of the hot junction of the thermocouple is [tex]520^oC[/tex]

Given that:

[tex]EMF = 15mv[/tex]

[tex]T_1 =20^oC[/tex] --- Temperature at cold junction

[tex]s = 0.03mv/^oC[/tex] ---- Sensitivity

The temperature [tex]T_2[/tex] at the hot junction is calculated as follows:

[tex]T_2 = \frac{EMF}{s} + T_1[/tex]

So, we have:

[tex]T_2 = \frac{15mv}{0.03mv/^oC} + 20^oC[/tex]

[tex]T_2 = \frac{15}{0.03/^oC} + 20^oC[/tex]

[tex]T_2 = \frac{15}{0.03}^oC + 20^oC[/tex]

[tex]T_2 = 500^oC + 20^oC[/tex]

[tex]T_2 = 520^oC[/tex]

Hence, the temperature of the hot junction of the thermocouple is [tex]520^oC[/tex]

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A nuclear scientist because they are more focused on extracting the nuclear energy of atoms.

Explanation:

A displacement reaction is the one wherein the atom or a set of atoms is displaced by another atom in a molecule. For instance, when iron is added to a copper sulphate solution, it displaces the copper metal. A + B-C → A-C + B.

Answer:

A. The relationship between the Sun,Moon,and Earth

Explanation:

Lanthanoids and actinoids are transition elements of the periodic table. These elements are lustrous and malleable and can conduct thermal energy and electricity. Thus, option A is correct.

Lanthanoids and actinoids are the terms used to refer to the elements of the f-block of the periodic table that are placed separately due to the difference in their electronic structures.

These elements show the property somewhat similar to that of the metals and hence are lustrous and malleable. Due to the transition electron phase, they are used in optical devices and cardiac pacemakers.

The lanthanoids and actinoids are good conductors of heat and electricity as their electrons can be transferred and carry charges like metals.

Therefore, option A. the lanthanoids and actinoids are conductors and are malleable.

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Answer:

In this type of solution, perchloric acid is a strong acid which means that its conjugate base is extremely weak. As such, the solution of HClO4 H C l O 4 and NaClO4 N a C l O 4 is not a buffer solution.

Explanation:

Hypothesis is answer.

Have a great day

Answer:

the answer of this question is B