Someone pls help me I will make you brain

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Answer:

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

Explanation:

Yes,I agree that it is a redox reaction.

In the given reaction potassium metal is placed in water and when a reactive metal is placed in water, it reacts with water to form metal hydroxide and hydrogen gas, as a result, potassium hydroxide and hydrogen gas are produced in the reaction.

A redox reaction is a reaction in which a substance is oxidized during the reaction whereas some other substance is reduced during the reaction, simultaneously.

The given chemical reaction is:

2K(s) + 2H20(l) arrow 2KOH(aq) + H2(g)

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Answer:

In the given reaction potassium metal is placed in water and when a reactive metal is placed in water, it reacts with water to form metal hydroxide and hydrogen gas, as a result, potassium hydroxide and hydrogen gas are produced in the reaction.

Explanation:

Answer:

nala

simba

Explanation:

Answer:

Explanation:

Building Vocabulary

Match each term with its definition by writing the letter of the correct definition on

the line beside the term in the left column.

5. nucleus   b

6. proton     f

7. neutron   h

8. electron  d

9. atomic number    g

10. isotopes              c

11. mass number      a

12. energy level       e

a. the sum of protons and neutrons in the nucleus of an

atom

b. the very small center core of an atom

c. atoms of the same element that differ in the number

of neutrons, but have the same number of protons

d. the particle of an atom that moves rapidly in the

space outside the nucleus

e. a specific amount of energy related to the movement

of electrons in atoms

f. the particle of an atom with a positive charge

g. the number of protons in the nucleus of every atom

of an element

h. the particle of an atom that is neutral

-. mass number  a.

12. energy level    e

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.

Answer:

C. Particle size

Explanation:

The sand, which has smaller particles, will go through the sieve, while the rice (with a larger particle size) will not

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:

insta

Explanation:

Zak_1231 follow me

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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.

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:

The answer to your question is Basic

Explanation:

pH ranges from 0 to 14, with 7 being neutral. pHs less than 7 are acidic while pHs greater than 7 are alkaline (basic).

I hope this helps!

Answer:

45 grams

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.

Deep ocean trenches, volcanoes, island arcs, submarine mountain ranges, and fault lines are examples of features that can form along plate tectonic boundaries.Because of the plates there are many things that is being made with the plates, but without the plates that makes earthquakes there wouldn't be any mountains,volcanoes, islands, fault lines, etc.For example, the San Andreas Fault couldn't have been made if it weren't for the plates.

Hope this helps! =D

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:

Boyles law

Explanation:

I think that is combined gas law.

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:

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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:

In writing the electron configuration for nitrogen the first two electrons will go in the 1s orbital. Since 1s can only hold two electrons the next 2 electrons for N goes in the 2s orbital. The remaining three electrons will go in the 2p orbital. Therefore the N electron configuration will be 1s22s22p3.

Explanation:

hope you get it right:)

Answer:

the electron configuration for N will be 1s^2 2s^2 2p^3

The rate of diffusion change would increase if the PO₂ in the capillaries was 40 mmHg and the PO₂ in the muscle cell changed from 40 to 20 mmHg.

Simple diffusion is the movement of molecular substances from a region of higher concentration to lower concentration. The mechanism with which the movement of O₂ travels from the blood to the body tissues takes place with the use of simple diffusion.

Now, if PO₂ changes from 40 → 20 mmHg in the muscle cells, and the PO₂ in the blood = 40mmHg. It implies that the pressure gradient(P) has increased. As such, there is an increase in the rate of diffusion of oxygen from the blood to muscle cells.

Learn more about diffusion here:

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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:A, Both reactivity and electronegativity decrease down a group.

Explanation: As you go down the periodic table they both will decrease

Answer:

electrons are fermions, they can only access an energy level if it has not already been occupied by another electron. Thanks to this principle, there is a minimum energy level within the atom and it is not possible for an electron to collapse to the nucleus because it cannot exceed this} threshold.

Explanation:

I hope I have helped you.

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  

Answer:

i cant read it but its c and a

Explanation:

my thinking faces

Answer:A

Explanation: