What evidence is there on the surface of the Earth of it's formation?

Answer:

7 to 5

Explanation:

power of 500 to 5

Answer:

A common theory suggests that desert pavements are formed through gradual removal of sand and other fine particles by the wind and intermittent rains leaving behind the large fragments. ... Once the pavement is formed the removal of fine particles ceases because the pavement acts as a barrier to further erosion.

Explanation:

Answer:

4

Explanation:

nonmetals are brittle and dull.

Answer:

[tex]\huge\boxed{\sf 21.6\ moles\ of\ MgO}[/tex]

Explanation:

Here,

for 1 mol of O₂, 2 moles of MgO are produced.

Also,

At STP:

1 mol of O₂ = 22.4 dm³/mol molar value

Moles in 242 L of O₂:

= volume / molar value

= 242 / 22.4

= 10.8 mol

Since:

1 mol of O₂ = 2 moles of MgO

10.8 mol of O₂ = 2 × 10.8 moles of Mgo

10.8 moles of O₂ = 21.6 moles of MgO

[tex]\rule[225]{225}{2}[/tex]

Answer: Yes

Helium (He) and Neon (Ne) are both noble gases. They are very common in our lives. Helium has a atomic number of 2, and neon has one of 10.

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Answer:

Red light.

Explanation:

On one end of the spectrum is red light, with the longest wavelength. Blue or violet light has the shortest wavelength. White light is a combination of all colors in the color spectrum. It has all the colors of the rainbow.

Answer:

red

Explanation:

red has a wavelength of 630-700 nm

Answer: Your answer is carbon dioxide in the air

Hope this helps!

Answer:

The way its parts are arranged ....I think

Answer:

chlorine-35 (75.53 percent) and chlorine-37 (24.47 percent)

Answer:

B.

F.

Explanation:

Take the given weight (784.616g) and divide it by the atomic weight of H2SO4.

The atomic mass can be found under the element symbol on the periodic table. You must add the atomic mass for each element in H2SO4 to get the total. The total atomic mass for H2SO4 will be about 98g.

Then divide the weight by this number.

784.616g/98g = 8.006 moles

Therefore, there is approximately 8 moles.

Answer:

CO2

Explanation:

As CO2 soaks up this infrared energy, it vibrates and re-emits the infrared energy back in all directions.

Answer:

3. add water to develop the procedure.

4. of course,, because sugar dissolves and sand does not.

Answer:

an element is a substance that cannot be broken down into any other substance. each element is made up of its own type of atom, which is why each element is different and unique than the other.

Answer:

In chemistry, an element is a pure substance which cannot be broken down by chemical means, consisting of atoms which have identical numbers of protons in their atomic nuclei. The number of protons in the nucleus is the defining property of an element, and is referred to as the atomic number

hope this helps! :) :) :)

Answer:

I think it's true

Explanation:

jnwnwnaokajz

Answer:

element A has a mass of 2 units, while an atom of element B

has a mass of 5 units, what would be the mass of the

compound A3 B2

Explanation:

Answer:

The same number of atoms of each element must appear on both sides of a chemical equation. However, simply writing down the chemical formulas of reactants and products does not always result in equal numbers of atoms. You have to balance the equation to make the number of atoms equal on each side of an equation.

Explanation:

Answer:

In this assignment, you will write and balance a chemical equation. Then,you will use a table of enthalpy values to calculate the energy change in the reaction. Next, you will create a model of the energy change in the reaction.Finally, you will write an explanation that describes the energy change in the reaction.

Explanation:

Answer:

About 28.9 kJ.

Explanation:

Recall the formula for specific heat:
[tex]\displaystyle q = mC\Delta T[/tex]

Where q is the amount of heat released, m is the mass of the substance, C is its specific heat, and ΔT is the change in temperature.

Therefore, by substitution, we have that:
[tex]\displaystyle \begin{aligned} q & = (625\text{ g})\left(\frac{0.900 \text{ J}}{\text{g-$^\circ$C}}\right)\left(\frac{1 \text{ kJ}}{1000 \text{ J}}\right) \left(82.1^\circ\text{C}-30.7^\circ \text{C}\right) \\ \\ & = (625\text{ g})\left(\frac{0.900 \text{ J}}{\text{g-$^\circ$C}}\right)\left(\frac{1 \text{ kJ}}{1000 \text{ J}}\right)(51.4^\circ\text{C}) \\ \\ & = 28.9\text{ kJ}\end{aligned}[/tex]

In conclusion, about 28.9 kJ of energy is needed.

Answer:

materials that allow heat to flow easily​ conductors of heat. For examples, aluminum, iron and copper.

Explanation:

Hope it helps!!!

Formation of precipitate is usually an evidence of a chemical change. The precipitate is a new substance that gets created due a chemical reaction between two or more different substances.  The precipitate can be the formation of a solid within a liquid or the formation of a solid within a solid due to a chemical reaction or change. The solid formation within a liquid is known as precipitate. This kind of chemical reaction can be seen in normal and daily life, as well as in laboratories.

Answer: A. 27.43 kPa

Explanation:

Use the formula: PV/T = PV/T →

P(.776) / (298) = (32.6)(.664) / (303) →

.0026P = .07144 →

P = 27.43 kPa :)

Answer:

The mixture of ethanol and water is a liquid-liquid solution. The solvent is Water.

Explanation:

Answer:

The purpose of the experiment is to see how water of different temperature and salinity affect the density.

Explanation:

Temperature and salinity directly affect the density of the water. Water of low temperature is more dense than water of high temperature, BUT, (fresh)water with no salt is less dense than (sea)water with more salt, so temperature and salinity change density of water.

Answer:

Please post the answers for the other questions on my page!! I will give you brainiest!! Please :(

Explanation:

Answer:

Average ocean pH is now 8.1 and varies seasonally

Explanation: