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Answer:

Boyles law

Explanation:

I think that is combined gas law.

Answer:

Lung function decreses at a faster rate for young people (last answer choice)

Explanation:

Answer:

The answer is 2.

Explanation:

Answer:

A) FeO

Explanation:

Options:

A) FeO

B) FeO2

C) Fe2O

D) Fe7O2

The correct answer is A) FeO.

(Hope this helps can I pls have brainlist (crown)☺️)

The empirical formula of a compound that contains only iron and oxygen and is 22.27% oxygen is FeO. The correct option is A.

The simplest whole number ratio of atoms in a chemical molecule is its empirical formula. The empirical formula is the chemical formula that gives the number of atoms of the chemical formula that is given in the chemical reaction.

For example, the C₆H₁₂O₆ is the formula of glucose. The simplest formula is CH₂O. This will be the simplest ratio of this compound. The first one, this C₆H₁₂O₆ is the molecular formula.

It only contains the element one quantity.  The empirical formula that contains oxygen and iron will be FeO. The empirical formulas is calculated by dividing the simplest formula.

Thus, the correct option is A) FeO.

To learn more about empirical formulas, refer to the link:

https://brainly.com/question/14044066

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The question is incomplete. Your most probably complete question is given below:

A) FeO

B) FeO2

C) Fe2O

D) Fe7O2

Answer:

Around 400 B.C.E., the Greek philosopher Democritus introduced the idea of the atom as the basic building block matter.

Explanation:

Hope this helps.

Answer:

insta

Explanation:

Zak_1231 follow me

Answer:

C

Explanation:

Fresh water fish need freshwater.

Answer: The condensation is the process which causes distance.

Answer:

An essential amino acid, or indispensable amino acid, is an amino acid that cannot be synthesized from scratch by the organism fast enough to supply its demand, and must therefore come from the diet.

Explanation:

Hope it helps you

Answer: They undergo chemical reactions with oxygen, releasing stored energy.

Explanation:

I took my k12 7th grade science unit test and got this question correct.

Have a good day and drink some water plz

The food molecules during cellular respiration they undergo chemical reactions with oxygen, releasing stored energy.

Chemical reaction is defined as a procedure in which one or more substances, known as reactants, are converted into one or more different substances, known as products.

It can also be defined as a method of chemically transforming one set of chemical substances into another.

There are basically six types of chemical reaction.

Cellular respiration is defined as the process of oxidizing biological fuels in the presence of an inorganic electron acceptor such as oxygen to produce large amounts of energy, which drives the bulk production of ATP.

It can also be defined as the process by which sugar from food is converted into energy within cells.

Thus, the  food molecules during cellular respiration they undergo chemical reactions with oxygen, releasing stored energy.

To learn more about chemical reactions, refer to the link below:

https://brainly.com/question/3461108

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Answer:

So one mole of Fe2O3 contains two moles of Fe3+ ions.

Explanation:

As there is an internal mole ratio of 2:3

It means that there are 2moles of iron within every mole of iron(III) oxide.

Iron III oxide is an ionic compound composed of Fe3+ ions and O2- ions. According to the formula, there are three O2- ions for every two Fe3+ ions.

Extra:

One 'unit' of Fe2O3 has two Fe3+ ions and three O2- ions, hence a dozen Fe2O3 contains two dozen Fe3+ ions and three dozen O2- ions, and a mole Fe2O3 contains two moles Fe3+ ions and three moles O2- ions.

Answer:

Atom

Explanation:

An atom can absorb or emit one photon when an electron makes a transition from one stationary state, or energy level, to another. Conservation of energy determines the energy of the photon and thus the frequency of the emitted or absorbed light.

Answer:

45 grams

Explanation:

Answer:

The electromagnetic force is a long range force which acts of charged particles. Like charges repel and unlike charges attract. ... The strong nuclear force is very short range and can only bind adjacent protons and neutrons. The electromagnetic force is long range.

Explanation:

Answer:

56.6 g/mol.

Explanation:

Assuming here that we have 100 atoms of each element. The percentage tells us that we have 10 atoms of the 55 isotope, 20 of the 56, and 70 of the 57.  

So the total is 10*55 + 20*56 + 70*57 = 5,660. And to get the average, we just divide by the total number of atoms (100).  

Atomic mass = 5660/100 = 56.6  

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soil - Alluvial soil

crops - Cotton, wheat, sorghum, bajra, maize, barley, jute, tobacco, green and black gram, chickpea, pigeon pea, etc.

Suitable properties : Mix of sandy loam and clay soil. Quick draining in nature. Rich in humus (organic matter) and phosphoric acid

soil - black soil

Crops - Cotton is the major crop. Other crops include wheat, cereals, rice, jowar, sugarcane, linseed,

Suitable properties : Black soils get sticky when fully wet. Rich in magnesium, iron, aluminum, and lime. They moisture excellently.

soil - laterite soil

crops - wheat, rice, pulses, rubber, tea, coffee, coconut, and cashews.

suitable properties : These Soils are acidic in nature and coarse and crumbly in texture. it is also rich in iron content.

soil - Arid soil

crops - Barley, maize, wheat, millets, cotton, and pulses.

Suitable properties - Sandy soils with low clay content, Saline in nature. Rich in plant food. Poor in organic matter and moisture because arid regions are usually dry.

soil - Mountain and Forest Soil

Crops- Wheat, barley, maize, tea, coffee, spices, tropical and temperate fruits.

Suitable properties - Acidic soil, rich in organic matter. Poor in lime, phosphorus, and potash. Good fertilization is required in these soils.

Density = mass ÷ volume

            = 217.0 g ÷ 24.3 cm³

            = 8.93 g/cm³

Answer:

i cant read it but its c and a

Explanation:

my thinking faces

Answer:

People are getting richer and richer as technology advances, this may make it so that some people are getting treated unfairly. Signs of little money may support the reason that you are not getting the help you need; this means that health problems would arise more, resulting in an unfair lifestyle.

Answer:

50,000,000 Hz

Explanation:

Rearrange the formula:

wave speed = frequency × wavelength → frequency = wave speed ÷ wavelength

wave speed = 300,000,000m/s

wavelength = 6m

Substitute in the values:

frequency = 300,000,000 ÷ 6

frequency = 50,000,000 Hz

Hope this helps!

Answer:  3 Changes can occur to physical properties of a substance, but the chemical composition of the substance remains the same

Explanation:

Physical change mainly physical properties of a substance while the chemical changes remain unchanged. Once there is a change to the chemistry of the substance, this would be classified as a chemical change.

Explanation:

It is known that an electron pair represents a domain. Hybridization of BF_{3}BF3 will be calculated as follows.

       Hybridization = \frac{1}{2}[\text{Valence electrons of central atom + no. of bonded atoms + negative charge - positive charge}]21[Valence electrons of central atom + no. of bonded atoms + negative charge - positive charge]

Valence electrons of boron are 3 and no. of bonded atoms in a BF_{3}BF3 molecule is 3.

Therefore, calculate hybridization of BF_{3}BF3 as follows.

          Hybridization = \frac{1}{2}[\text{Valence electrons of central atom + no. of bonded atoms + negative charge - positive charge}]21[Valence electrons of central atom + no. of bonded atoms + negative charge - positive charge]

                              = \frac{1}{2}[3 + 3 + 0]21[3+3+0]

                               = 3

Hence, hybridization of BF_{3}BF3 is sp^{2}sp2 , that is, trigonal planar.

Thus, we can conclude that the given image represents that it is a trigonal planar molecule with three domains.        

Answer:

electron pair => 1 covalent bond => same as H:H

Explanation:

The bar notation is generally accepted as a pair of electrons depicting a 'single' chemical bond. If two bars are shown (e.g; C=C) then two chemical bonds are represented. If three bars are shown (e.g; N≡N) then three chemical bonds are represented. This is the highest number of bonds that can exist between two elements. Hope this helps. :-)

Answer:

Translated < what is the maximum number of electrons in the sublevel 4s?

answer 32 electrons

Answer:

fussion

your welcome

Answer:

nala

simba

Explanation:

Answer: It's the circulatory system

Explanation:

The phenomenon is known as the Greenhouse Effect.

When the sun's energy reaches the Earth, some is reflected into space, but the rest is absorbed by gases and warms the atmosphere. The phenomenon is known as the Greenhouse Effect.