CAN SOMEONE PLEASE HELP ME?!

Answer:

1. chemical fertillizers encourage plant disease

2. chemical fertillizers affect micro-organism living in the soil.

Explanation:

Answer:

it is a physics questions not chemistry

Explanation:

speed=distance/time

so distance =speed * time

=120*4

=480 km

Answer:

Mass = 21.58 g

Explanation:

Given data:

Mass of MgCl₂ = 35 g

Mass of Mg(OH)₂ produced = ?

Solution:

Chemical equation:

MgCl₂ + 2KOH    →     Mg(OH)₂ + 2KCl

Number of moles of MgCl₂:

Number of moles = mass/molar mass

Number of moles = 35 g/ 95.2 g/mol

Number of moles = 0.37 mol

now we will compare the moles of MgCl₂ and Mg(OH)₂

                MgCl₂         :        Mg(OH)₂

                   1               :            1

                 0.37           :        0.37

Mass of  Mg(OH)₂ :

Mass = number of moles × molar mass

Mass = 0.37 mol × 58.32 g/mol

Mass = 21.58 g

Answer:

The correct answer is  - 32 cells.

Explanation:

In the meiosis type of cell cycle or cell division, a single parent cell divides into four daughter cells, unlike mitosis. Meiosis takes place in the reproductive or sex cell and called reduction division.

As we know each cell divide into four daughter cells.

1  reproductive cell = 4 daughter cells

2 reproductive cell = 8 daughter cells

Now each daughter cell undergo meiosis than each cell will produce 4 cells so,

8 daughter cells will produce:

8 *4 = 32 cells.

Thus, the correct answer is  - 32 cells.

Answer:

pH = 1.6

Explanation:

pH + pOH = 14

=> pH + 12.4 = 14

∴ pH = 1.6

pls mark it as the brainliest

a) ionic

chlorine is present in top of group 17 and right of period 3 and

electronegativity(the tendency to gain electrons)

increases up the group and right the group.

so it has high tendency to form anion.

In the same way both Na and K are present up the group and left side and the tendency to lose electrons in both becomes high and they tend to form cation.

Answer:

False

Explanation:

Please mark brainlliest if you want and mark 5 stars please. Thank you and have a good day.

Answer:

5 atoms are in each molecule of calcium carbonate

Answer:b

Explanation:

Answer:

B) nitrogen

the Earth's atmosphere is mostly nitrogen

Answer:

Bohr models show the electrons in atoms are in orbits of differing energy around the nucleus while Dot Diagrams show the bonding in a small molecule only.

Explanation:

Answer:

Gravity always pulls objects such as a desk, book or person down. Thus, when you jump gravity causes you to land on the ground. Friction, however, doesn't pull objects down

Answer:

Carbon

Explanation:

Answer:

because no chemical change is happening

Explanation:

Answer:

V₂ = 1.86 L

Explanation:

Given data:

Initial volume = 4.30 L

Initial pressure = 1 atm

Initial temperature = 273.15 K

Final temperature = 302 K

Final volume =  ?

Final pressure = 2.56 atm

Solution:

According to general gas equation:

P₁V₁/T₁ = P₂V₂/T₂

V₂ = P₁V₁T₂ /T₁ P₂

V₂ = 1 atm ×4.30 L × 302 K / 273.15 K × 2.56 atm

V₂ = 1298.6 atm.L.K / 699.26 K.atm

V₂ = 1.86 L

Answer:

3 chlorine atoms are needed because each chlorine atom accepts one of  Aluminum three valence electrons to obtain a full octet and makes chlorine a  negatively charged anion

Explanation:

How many chlorine atoms are needed when making Aluminium Chloride?

The formular for aluminium chloride is given as; AlCl3

In the compound, Aluminium has a valency of +3 and the three chlorine atoms each have a valency of +1 to make the compound a neutral compound.

That meas we can represent AlCl3 as Al³⁺ and 3Cl⁻

The correct statement is;

3 chlorine atoms are needed because each chlorine atom accepts one of  Aluminum three valence electrons to obtain a full octet and makes chlorine a  negatively charged anion

Answer:

False

Explanation:

Not all molecules are compounds, since some molecules, such as oxygen gas (above image of molecule of-O2) or ozone (O3), consist only of one element or type of atom. Water is also a molecule because it is made from atoms that have been chemically combined.

Answer:

I think it's B.

Answer:

well, u can figure that out by multiply that amount by Avocado's number, which is 6.022x10 to the power of 23

Answer:

Chromium is electroplated on other metals. 2. Gold is electroplated on other cheap metals.

Answer:

The correct statement is;

(B) Only II

Explanation:

I) The atomic mass unit or amu which is also known as daltons which is defined as 1/12 × the mass of a carbon-12 atom, which is therefore, 1.660538921 × ⁻²⁴ grams

Therefore, the mass of 1 atom of carbon-12 = 12 amu

II) The mass of one mole of oxygen-16 is 16 grams while the mass of one mole of carbon-12 is 12 grams

The mass of 4 atoms of carbon 12 = 4 × 12 amu = 48 amu

The mass of 1 atom of oxygen-16 = 15.99491461956 amu

Therefore, the mass of 3 atoms of oxygen-16 = 3 × 15.99491461956 = 47.9847438587 amu ≈ 48 amu

Therefore only II is correct.

Answer:

See explanation

Explanation:

The phase changes of carbon dioxide is quite interesting. It is even more interesting that its phase change from gas to solid is dependent on pressure and temperature.

The triple point of CO2 is -56°C at 5.11 atm pressure. This implies that below 5.11 atm, liquid CO2 can not exist. In fact, at -78°C and 1 atm, CO2 is a solid.

Hence, when pressure increases from 1 atm to 10 atm at -40C, CO2 changes from liquid to gas.

Answer:

A. Designing a device that is biologically compatible

Explanation:

Answer:

Explanation:

When you are pedaling the bike, it is transforming chemical energy, supplied by the breakdown of the food you eat (any food), into mechanical energy to turn the pedals (energy we produce). The chemical energy is potential and the mechanical energy is kinetic.

Hope this helps :)

Answer: sorry I’m late but it is 11 electrons

Explanation:

Answer:

Water

Explanation:

hope that helps:)

Answer:

water, work

Explanation:

The flow of electros through a conductor is electric current. These electrons cannot be seen and so electric circuits can be used to model the arrangement and understand the process. Water flowing through pipes is a fitting mechanism that looks like the electrical circuit.

In this mechanism, the pipe is seen as the wire in the electric circuit while the pump is viewed as the battery. The pressure, like the voltage generated by the battery, comes from the pump and drives the water through the pipe.

Explanation:

Hope it will help):)

Answer:

an acid is any hydrogen containing substance that. can donate protons.

a base is a molocule that is able to accept hydrogen ion from an acid