Can u see bubbles in chemical reactions ​

Answer:

false

Explanation:

salt water cannot be classified as a substance because it's composition can vary

Answer:

N = 32 atoms

Explanation:

The radioactive elements decays as follows:

Ln (N/N₀) = -kt

Where N are number of atoms after t time, N₀ are initial number of atoms, k is decay constant in time⁻¹

We can obtain k from t(1/2):

k = ln 2 / t(1/2)

k = 0.02236s⁻¹

Ln (N/128 atoms) = -0.02236s⁻¹*62s

(N/128 atoms) = e^-1.386

N/128 atoms = 0.25

N = 128 atoms * 0.25

Mercury, Venus, and Mars are all rocky planets. None are more or less different than Earth. Earth is the largest and the only planet with extensive regions of liquid water.

Explanation:

Answer:

En nuestro sistema solar, hay cuatro planetas terrestres, que también son los cuatro más cercanos al sol: Mercurio, Venus, Tierra y Marte. Durante la formación del sistema solar, probablemente hubo más planetoides terrestres, pero se fusionaron entre sí o fueron destruidos.

Answer:

all of above

Explanation:

Answer:

gravity's is why I can sit or jump and not fly into space and is why we have a atmosphere. basically gravity is why my daily life even exist.

Explanation:

Answer:

Gravity keeps us grounded. it helps us everyday just to stay on the ground. If we didnt have gravity we would just flout away.

Answer:

u didn't list anything

Explanation:

buh water and oxygen forming hydrated iron

Answer:

look at the image below

Explanation:

The Bohr model of phosphorus depicts 15 electrons in different energy levels, with the nucleus at the center.

Two electrons are present in the first energy level, eight electrons are present in the second and five electrons are present in the third. The electron configuration of phosphorus, which is [tex]1s^2 2s^2 2p^6 3s^2 3p^3[/tex], matches this distribution.

The formula [tex]2n^2[/tex], where n is the energy level number, determines the maximum number of electrons in each energy level. Therefore, the first energy level can accommodate only two electrons, the second energy level up to eight, and the third energy level up to eighteen.

Learn more about Bohr model, here:

https://brainly.com/question/32677295

#SPJ6

Answer: To determine the most abundant isotopic form of an element, compare given isotopes to the weighted average on the periodic table.

Answer:

pH>7

Explanation:

bases tend to increase the pH of a solution. since water has the pH of 7 and NaOH has pHof 14, the overall pH of solution will increase.

hope it's helpful.

Answer:

[tex]{\huge{\pink{\underline{\underline{Question:}}}}}[/tex]

What is the pH of a solution prepared by dissolving

0.8 g NaOH in water to make 200 mL solution?

[tex]{\huge{\pink{\underline{\underline{Answer:}}}}}[/tex]

pH>7

Bases tend to increase the pH of a solution.Since,water has the pH of 7 and NaOH has pH of 14, the overall pH of solution will increase.

Answer:

The mass of hydrogen gas liberated is 0.6 g.

Explanation:

Given data:

Mass of Mg = 6.5 g

Mass of hydrogen gas liberated = ?

Solution:

Chemical equation:

Mg + 2HCl     →    MgCl₂ + H₂

Now we will calculate the number of moles of Mg.

Number of moles = mass / molar mass

Number of moles = 6.5 g/ 24 g/mol

Number of moles = 0.3 mol

Now we will compare the moles of Mg with hydrogen gas.

            Mg         :          H₂

             1           :           1

             0.3       :        0.3

Mass of H₂:

Mass = number of moles × molar mass

Mass = 0.3 mol × 2 g/mol

Mass = 0.6 g

Answer:

ground state

Explanation:

A ground state is when the electron is closest to the nucleus.

The ground state of an electron is the state of the lowest energy for that electron. The nucleus is surrounded by electrons that occupy orbitals of varying energy levels.

When an electron jumps to an energy state greater than its ground state, then it is in an excited state. An electron can become excited from the ground state to the excited state if it is given extra energy in the form of a photon, or packet of light.

An electron occupies the lowest energy level that is closer to the nucleus when the electron is present in the ground state.

Learn more about the ground state of an atom, here:

https://brainly.com/question/2289096

#SPJ2

Answer:

It represents a  partially permeable membrane

Explanation:

As the water is added to the teabag it causes the tea leaves to move and triggers diffusion of the leaves. ... The addition of heat (from the hot water) to the tea bag causes its molecules to move much faster than at room temperature

Answer:

The cell membrane

Explanation:

I checked it and it’s right on A P E X. I hope this helps!!

Proof:

Answer:

A continuous spectrum can identify elements by the presence of dark bands, and it also tells scientists how hot the object is: As the temperature goes up, the spectrum has increasing amounts of green, blue and violet colors. Relatively cool objects have a spectrum that has mostly deep red or red and yellow.

Explanation:

Answer:

13.5 moles Ne

Explanation:

Atoms --> Moles

1. Put the given number over 1

2. Multiply by 6.022x10^23 to get to moles

3. Round by sigfigs

(8.15x10^24 atom Ne(g)/1) (1 atom Ne(g)/6.022x10^23molesNe)=13.5337...

13.5337 --> 13.5 moles Ne

Answer:

B

Explanation:

It was the correct answer when I answered it

The part of the wave that the arrow is pointing to is the crest.

Hence we can conclude that the part of the wave that the arrow is pointing to is the crest.

Learn more here: https://brainly.com/question/1959770

Answer:

[tex]\boxed {\tt 48 \ grams}[/tex]

Explanation:

Mass can be found by multiplying the density by the volume.

[tex]m=d*v[/tex]

The density is 2 grams per cubic centimeter.

The volume is 24 cubic centimeter.

[tex]d= 2 \ g/cm^3 \\v=24 \ cm^3[/tex]

Substitute the values into the formula.

[tex]m= 2 \ g/cm^3 *24 \ cm^3[/tex]

Multiply. Note that the cubic centimeters, or cm³ will cancel each other out.

[tex]m= 2 \ g * 24[/tex]

[tex]m= 48 \ g[/tex]

The mass of the material is 48 grams.

Answer:

Rainfall - precipitation

disappeared puddles - evaporation

cloud formation - condensation

Explanation:

Rainfall that is observed by the Susan is the precipitation of the water cycle in which the water vapor that was condensed become heavy and form droplets of water and fall from sky to the earth surface.

Puddles that formed due to rainfall are the collection of water in the water cycle which is evaporated (process: evaporation) into the atmosphere n the form of water vapor which condensed to form clouds.

Answer:

a.20g/cm

hope this helps :)

Explanation:

Answer:

38.9 grams of [tex]BaCl_2[/tex]

Explanation:

0.187 mol BaCl2 x [tex]\frac{208 g}{1 mol}[/tex]

0.187 m x 208 g/m

0.187 x 208 g

38.896 g --> 38.9 g BaCl2

Answer:

No

Explanation:

There is only one Nitrogen on the left side while there are 2 on the right. Also there is zero oxygen on the left side and two on the right. The amounts of hydrgen arent equal to each side either.

Answer:

I think they use water,shovel,and rake.

Explanation:I was in ag in 8th grade and first we used a rake and raked all the stuff up. Then we waterd the dirt. Then dug a hole and planted the plant and waterd it after.

I hoped this help have a nice day! Comment if you need more help.

Also please rate 5 and give thanks.

Answer:

1.0 something depending on your periodic table.

Explanation:

You are given atoms. Not molecules. The mass is what you would read from the periodic table. 1.000 in some form is the answer.

In nature, Hydrogen is found as H2 everywhere except in the sun or a star. The molecular mass (not the atomic mass) would be 2.000 something.

Answer:

are there answer choices with the question?

Explanation:

sorry im a little confused

Answer:

um... hydrogen gas

gold metal

sugar (sucrose)

Answer:

Fluorine is the most reactive because it has 7 electrons in the outer shell. The conclusion of this element's chemical reactivity is valid .

Explanation:

Among all the given elements - Boron ,Fluorine , Silicon and Gallium , Fluorine is the most reactive element because it has 7 electrons in the outer shell. It has a very small size and only requires one electron to get into a stable configuration with that of noble gases. Thus, to reach that stable state, they react spontaneously with elements, leading to its high reactivity.

Therefore, most reactive elements are in the halogen band, and none of the other three elements called Boron, Silicon and Gallium belong to the halogen group.

Hence, the correct answer is B (fluorine is the most reactive because it has 7 electrons in the outer shell).

Answer:

Forces inside the atom

The atom is comprised of three major particles—protons, neutrons and electrons. There are four forces (Electromagnetic, Strong, Weak, and Gravity) that are responsible for the behavior of the particles and thus keep the atom together.