Help please I have 10 min.

Answer:

Explanation:

An element with atomic number 18 is a noble gas.

The element with atomic number 19 will have one extra electron so it can donate one electron or shed one electron to attain noble gas configuration .

It tends to shed one electron to become positively charged ion . Hence they are electro-positive elements .  

Similarly the element with atomic number 17 will have one short  electron so it can gain  one electron  to attain noble gas configuration .

They  tend to gain  one electron to become negatively charged ion . Hence they are electro-negative  elements . They have high  electronegativity .

Answer:

Easy portability,easy convertability, high calorific value for its unit mass.

Explanation:

Oil is so incredibly valuable as an energy source as it has easy portability, easy convertibility, high calorific value for its unit mass.

Any chemical compound that is nonpolar, predominantly hydrocarbon-based, hydrophobic, and lipophilic is considered to be an oil. Typically combustible and surface active, oils. Most oils are lipids which become liquid above room temperature and are unsaturated. Classes of chemical substances that may be unconnected in structure, characteristics, and usage are included in the general concept of oil.

They are employed in the production of numerous varieties of paints, plastic bottles, and various other products, as well as for usage as food (such as olive oil), fuel (such as heating oil), lubricant (such as motor oil), and medical uses. Some religious rituals and ceremonies employ specially formulated oils as cleansing elements. Oil is so incredibly valuable as an energy source as it has easy portability, easy convertibility, high calorific value for its unit mass.

Therefore, oil is so incredibly valuable as an energy source as it has easy portability, easy convertibility, high calorific value for its unit mass.

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Answer: Please find answer in explanation column

Explanation:

Numbering the steps in the correct order to show how ice changes into gas, we have that

1.Ice molecules vibrate in a fixed place.

2. Ice is heated and the molecules speed up

3. The molecules gain enough kinetic energy to leave their solid form.

4.The water becomes liquid and gets hotter.

5. The molecules leave their liquid form and enter the air as a gas.

Ice is the solid form of water  which cannot freely move around in this form  so  it vibrates  about its fixed position.When heated,its molecules acquire energy and its vibration  speeds up  causing it to overcome its  binding forces (that makes it vibrate about a fixed position) and becomes mobile as it leaves its solid form to acquire a liquid state.    With continuous heating, the liquid gets hotter making the molecules vibrate more rapidly, spread out and move freely at high speeds to form Water vapour - The gaseous state of water.

Answer:

spores

egg

zygote

Explanation:

i think this is right

Answer:

1) spores

2) egg

3) zygote

Explanation:

hope this helps :)

Answer:

These trends were attributed to both the increased external loads and to a reduction in the lake sediment's ability to assimilate nutrients from the water column. The main sources of external nutrient inputs are animal waste and fertilizers applied to food and forage crops.

Answer:

See explanation

Explanation:

We know that the thermal energy of a substance largely depends on the temperature of the body. This implies that the hotter a substance is, the greater its thermal energy and vice versa.

When you bring a cold can of soda out of the refrigerator, the molecules of air at room temperature gradually loose energy to the can and condense around it. This transfers thermal energy from the air particles to the molecules in the cold can of soda and the soda warms up pretty soon!

Answer:

As trees grow, they help stop climate change by removing carbon dioxide from the air, storing carbon in the trees and soil, and releasing oxygen into the atmosphere. Trees provide many benefits to us, every day.

Answer:

it could destroy the nucleus

Explanation:

due too much power going into it

Answer:

6. Mutalism

7. Commensalism

Explanation:

6- Both species benefit = (mutualism).

7- Commensalism is an association between two organisms in which one benefits and the other derives neither benefit nor harm.

Answer:

6: C. Parasitism

7: B. Commensalism

Explanation:

6: Here the flea gets its nutrients from the mouse's blood and the flea benifits from the expense of the mouse.

7: Commensalism is a type of relationship between two living organisms in which one organism benefits from the other without harming it

Answer:

it should be chemical

Explanation:

Answer:

Potassium is a very high reactive metal. Exposed to water, it explodes with        a purple flame. Potassium is involved in the health of cells and of blood vessels, so its reactivity has increased values, being used by scientists for blood pressure as well as lethal injection, enough could cause your heart to stop. Take bananas for example, they contain potassium, enough for humans.

Explanation:

Answer:

208.81

Explanation:

i think this is the answer hope this helps

Answer:

Sorry my task time about to run out : (

Explanation:

Answer: The economic demands of Plan B were too high.

Explanation: During the selection of any action plan to maintain biodiversity, several factors must be considered. These factors include the cost of the plan, the estimated effectiveness of the plan at protecting the targeted populations, and how the plan will affect both humans and other populations in the area.

The chart shows that the approximate cost of implementing Plan A was $5 billion. The approximate cost of implementing Plan B was $30 billion. While Plan B might have been more effective at reducing habitat destruction, and thus maintaining biodiversity, state officials likely chose Plan A over Plan B because the economic demands of Plan B were too high.

Answer: The economic demands of Plan B were too high.

Explanation:

just did it

Answer:

They are evaporation, condensation, precipitation and collection

Explanation:

e 20 neutrones

Answer:

31 neutrons

Explanation:

Potassium has 19 protons (you can tell by the atomic number)

Potassium-50 is an isotope, meaning that there are a different amount of neutrons than normal.

Protons never change so subtract 50 from 19 to get the number of neutrons.

Answer:11

explain

: cause i think it is

Answer:

To summarise, a parent cell divides by mitosis (doubling the DNA then splitting) and then divides again to have 4 daughter cells with all different DNA in and all with only half the amount of DNA as a normal body cell. This stage is meiosis. They make sperams and eggs which fuse together in fertilisation and once fertilised the cell will divide by mitosis to create embryos and further to grow into a fetus.

Answer:

Temperature is a measure of the kinetic energy of particles in a substance. As temperature increases, the atoms or molecules in a substance gain energy.

Explanation:

Answer:

1 Valence Electron

2 Proton

3 Neutron

4 Nucleus

Explanation:

im smart

Answer:

In order most reactive to least reactive:

D

B

A

C

Explanation:

The reactivity series is depend on the element that reacts with the oxygen. The metal which replaces the other metal is a more reactive metal.

In the question, there are different metals and we have to find the reactivity series of the unknown metal

The series in decreasing order is as:- D  > B  > A  > C.

In this reaction, the upper element replaces the lower elements because it is highly reactive.

Hence, the correct sequence is D  > B  > A  > C.

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Answer:

what

Explanation:

Answer: a) [tex]H_3PO_4+3NaOH\rightarrow Na_3PO_4+3H_2O[/tex]

b) [tex]PCl_3+3H_2O\rightarrow P(OH)_3+3HCl[/tex]

c) [tex]2Al+3H_2SO_4\rightarrow Al_2(SO_4)_3+3H_2[/tex]

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side.

The balanced chemical equations are :

[tex]H_3PO_4+3NaOH\rightarrow Na_3PO_4+3H_2O[/tex]

[tex]PCl_3+3H_2O\rightarrow P(OH)_3+3HCl[/tex]

[tex]2Al+3H_2SO_4\rightarrow Al_2(SO_4)_3+3H_2[/tex]

Answer:

A shadow is that thing that follows you everywhere when the sun is out. It's creepy!

Explanation: Hope I helped!

Answer:

A shadow is a dark form that you cannot touch, hear, feel, or taste. It's simply formed when an object blocks a source of light.

Answer:

A. light

Explanation:

I know because with longer wavelengths than visible light, has been "invisible" to the human eye.

Answer:

2.5 mol

Explanation:

Answer:

1180.3 km

Explanation:

Not sure, but I think you would divide it.

3541 km ÷ 3 hrs = 1180.3 km

Hope this helps, thank you !!

Answer: H

Explanation: