PLEASE HELP FILL IN TABLE

Answer:

helium and argon

Explanation:

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.

Hope this helps you!

[tex]p = \frac{e}{t} [/tex]

where e is the energy.

& t is the time.

[tex]p = \frac{200}{5} = 40 \: w[/tex]

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:

3. add water to develop the procedure.

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

Answer: Electrons: 15 Atomic number :15

Explanation:

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:

4

Explanation:

nonmetals are brittle and dull.

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: Your answer is carbon dioxide in the air

Hope this helps!

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:

2450000 gram

Explanation:

v= m × ρ= 1 cubic meter × 2.45 gram/cubic centimeter= 1000000 cubic centimeter × 2.45 gram/cubic centimeter= 2450000 gram

Explanation:

v=m over D

mass=20.oog

Density=2.45g

20.00-2.45

ans is 17.46

Answer:

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

Explanation:

Hope it helps!!!

Answer:

hope it helps...

Explanation:

it is determined by the concentration of hydrogen ions, the percentage of hydrogen ions contained in the solution.

Let's take water as an example.

As you know, the formula for water is H2O. Most of the molecules in water are in that extremely stable form we know as H2O.

However, a very tiny percentage of those molecules have broken up into hydrogen ions (H+) and hydroxide ions, (OH-), as illustrated in the figure.

Actually, this balance of hydrogen ions and hydroxide ions determines the pH of the water.

When the hydrogen ions outnumber the hydroxide ions, the solution is acidic. If the reverse is true, then the solution is alkaline.

In pure water, the hydrogen ion (hydroxonium ion) awareness has to be equal to the hydroxide ion awareness. For every hydrogen ion fashioned, there may be a hydroxide ion shaped as nicely which means that you can update the [OH-] term inside the Kw expression with some other.

As the awareness of hydrogen ions in the solution grows, the greater acidic the solution becomes. As the extent of hydroxide ions will increase the greater primary or alkaline, the solution turns into.

Learn more about hydrogen ions here: https://brainly.com/question/26424076

#SPJ2

Off the top of my head I only have one example of evolution on humans lol

Wisdom teeth

Explanation:

Our ape-like ancestors used to use wisdom teeth to chew on bark and other hard foods. Today, we don't use them at all, and we're even at the point that some people are born with no wisdom teeth at all.

Answer:

Evolution is a change in the genetic makeup of a population over time.

A few evidences are:

Anatomy. Species may share similar physical features because the feature was present in a common ancestor (homologous structures).

Molecular biology. DNA and the genetic code reflect the shared ancestry of life. DNA comparisons can show how related species are.

Biogeography. The global distribution of organisms and the unique features of island species reflect evolution and geological change.

Fossils. Fossils document the existence of now-extinct past species that are related to present-day species.

Direct observation. We can directly observe small-scale evolution in organisms with short lifecycles.

Hope this helps! :D

Ah, yes, these are all very special, and have different looks and textures, to learn about these awesome rocks,

Take a look at the chart shown.

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 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:

Evaporation

Explanation:

If the water is completely evaporated we will get separated sugar from the mixture. If we dissolve the mixture in alcohol we will get the salt separated while sugar will be dissolved in alcohol.

Answer:

B.

F.

Explanation:

Answer:

Catalyst:

Explanation:

A catalyst is a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.

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.

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:

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

Certain naturally occurring radioactive isotopes are unstable: Their nucleus breaks apart, undergoing nuclear decay. ... All elements with 84 or more protons are unstable; they eventually undergo decay. Other isotopes with fewer protons in their nucleus are also radioactive.

Answer:

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

Answer:

Multicellular Organism

Explanation:

Unicellular organisms are made of one cell. For example, bacteria. Multicellular organisms are made up of more than one cell. For example, humans.

If the entire organism is one cell, that one cell carries out all the functions. In contrast, we have different cells to carry out different jobs. E.g. blood cells, skin cells, stomach cells and many more.  

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: