Please help me I will give you the brain thing with extra points if you help me, please. I need to get this right. 9/10

Answer:

B

Explanation:

metal is denser, wood will float and so will paper and plastic

Answer:

Seahorses: Disadvantages-Because of the amount of mating and giving birth, it can make the male tired. Another disadvantage is that whilst the male is carrying them he gets aggressive. ... Advantages-They give birth to loads of seahorses so a lot of them will survive.

Answer:

It has mass and takes up space

Explanation:

Just did something similar like this 10 minutes ago lol

Answer:5

grams per cubic centimeter

Explanation:

Note:

1

ml

=

1

cc

If the water rose

7

ml

−

2

ml

=

5

ml

then the stone had a volume of

5

ml

or

5

cc

With a mass of

25

g

it must have a density of

XXX

25

g

5

cc

=

5

g/cc

Explanation:

Answer:

Helium. Symbol for Helium is: He . The atomic number (Z) is: 2. The mass number (A): 4. Common human uses of the element: Because it is very unreactive, helium is used to provide an inert protective atmosphere for making fiber optics and semiconductors, and for arc welding. Helium is also used to detect leaks, such as in car air-conditioning systems, and because it diffuses quickly it is used to inflate car airbags after impact. present in a common molecule: Helium does not bond with the other atoms. if its dangerous: helium can cut off oxygen supply or can cause an embolism if a person inhales too deeply.

--------------------------------------------------------------------------------------------------------------

Carbon. Symbol: C. The atomic number (Z): 6. The mass number (A): 12. Common human uses of the carbon: is used in metal smelting. It is particularly important in the iron and steel industries. Graphite is used in pencils, to make brushes in electric motors and in furnace linings. Activated charcoal is used for purification and filtration. The carbon atom has unique properties that allow it to form covalent bonds to as many as four different atoms, making this versatile element ideal to serve as the basic structural component, or “backbone,” of the macromolecules. Individual carbon atoms have an incomplete outermost electron shell. If its dangerous: Elemental carbon is of very low toxicity. Health hazard data presented here is based on exposures to carbon black, not elemental carbon. Chronic inhalation exposure to carbon black may result in temporary or permanent damage to lungs and heart.

--------------------------------------------------------------------------------------------------------------

Sodium. The Symbol: Na. Atomic number: 11. Mass number: 23. Common human uses : Sodium is important for many different functions of the human body. For example, it helps cells to transmit nerve signals and regulate water levels in tissues and blood. Sodium is the sixth most common element on Earth, and makes up 2.6% of the Earth's crust. The most common compound is sodium chloride. The most common compound of sodium is sodium chloride (common salt). If its dangerous: Sodium is essential to human health, but too much sodium is poisonous. Sodium poisoning can cause seizures, coma, and death.

--------------------------------------------------------------------------------------------------------------

Nitrogen. Symbol: N. Atomic number :7. Mass number: 14. Common human uses :Human activities, such as making fertilizers and burning fossil fuels, have significantly altered the amount of fixed nitrogen in the Earth's ecosystems. If its present in a common molecule: Common compounds with nitrogen atoms include ammonia (NH3), nitrous oxide (N2O), nitrites, and nitrates. Nitrogen is also found in organic compounds such as amines, amides, and nitro groups. If its dangerous: High concentrations of nitrogen gas can be particularly harmful to human health. Nitrogen can displace oxygen from ambient air within an enclosed space leading to a dangerous build-up of the inert gas.

--------------------------------------------------------------------------------------------------------------

Potassium. Symbol: K. Atomic number: 19. Mass number:39.  Common human uses: Potassium is a mineral that plays many important roles in the body. Food sources of potassium include fruits (especially dried fruits), cereals, beans, milk, and vegetables. Potassium is most commonly used for treating and preventing low potassium levels, treating high blood pressure, and preventing stroke.  If its present in a common molecule: Potassium forms many important compounds. Potassium chloride (KCl) is the most common potassium compound. It is used in fertilizers, as a salt substitute and to produce other chemicals. Potassium hydroxide (KOH) is used to make soaps, detergents and drain cleaners. If its dangerous: Having too much potassium in your blood can be dangerous. Potassium affects the way your heart's muscles work. When you have too much potassium, your heart may beat irregularly, which in the worst cases, can cause heart attack.

-------------------------------------------------------------------------------------------------------------

Answer:

The correct answer's B, give brainly if this helped :)

Explanation:

Answer:

Amoebas, Yeasts, Hydras, and Ferns only

Explanation:

This is because they can asexually reproduce which is why their offspring wil be identical

Answer:

Amoebas, yeasts, hydras, and ferns

Explanation:

Answer:

1,632 meters.

Explanation:

Answer:

1,632 m i think

Explanation:

m = meters

For the next 24-48 hours, Pittsburgh will see light rain. The storm is moving west-to-east toward Pittsburgh, as indicated by a drop in pressure over western cities. Precipitation is usually associated with low pressure systems.

To learn more about weather forecasting, refer to:

brainly.com/question/24730207

#SPJ2

the answer is 1 along the coast

Answer:

Charges: positive and negative

Explanation:

When we put a charged object near an uncharged object, it produces opposite charges in the near end of the uncharged object by electric induction. In the figure, we can see that the ballon has charges which produces opposite charges in the paper which is uncharged

Answer:

c i think

Explanation:

becuse hawks hunt snakes for food  aslo becuse

Answer:

its A. The hawk population would increase

Explanation:

because if there is alot of snakes then the hawks will have more to eat

Answer:

D. Liquid

Explanation:

Solid matter is composed of tightly packed particles. A solid will retain its shape; the particles are not free to move around. Liquid matter is made of more loosely packed particles. It will take the shape of its container.

Answer:

Where are all my chemistry geniuses at??

1. 2HG + O2 = 2HGO

2. Ca + 2H2O = Ca(OH)2 + H2

3. H2 + Cl2 = 2HCl

4. Fe + S = FeS

Explanation:

Hope it helped!

Answer:

Mercury and oxygen react to yield mercuric oxide. > 2Hg + O2 = 2HgO

Calcium and water react to yield calcium hydroxide and hydrogen. > Ca + 2H2O = Ca(OH)2 + H2

Hydrogen and chlorine react to yield hydrochloric acid. > H2 + Cl2 = 2HCl

Iron and sulfer react to yield iron sulfide. > Fe + S = FeS

Explanation:

Answer:

a and c

Explanation:

I'm only sure on a but c is the second best so Yea don't completely trust it

Answer:

.

Explanation:

Answer:

#2 Metal paper clip and iron nails

Explanation:

This is because they are both magnetic. Hope this helps. :)

Answer

ummm  maybe c or d

dont count on me though!

Explanation:

Answer:

2nd one I think

Explanation:

hope this helps

Answer:    

Sb and Te

Explanation:

there are on the stair step

Answer:

The Answer Is C

Explanation:

Answer:

c abyssopelagic zone

Explanation:

Answer:

the answer is D. Mesopelagic Zone

Explanation:

i know the answer is the 'Twilight Zone,' but its scientific name is the Mesopelagic Zone

Answer:

C

Explanation:
Average Speed = total distance covered / total time taken

the distance she covered didnt change because the race track stayed 5km.
However, she did take a longer time to complete the race because she stopped in the middle to tie her shoes
Therefore, C is the answer.

The reason the Noble Gases, the least reactive elements on the periodic table, are they all have eight valence electrons in their outer shell. The correct option is C.

Noble gases are the gases of the periodic table that contain a fully filled last orbital with electrons, that is why they are called noble gases. These gases are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn).

Noble gases are the least reactive elements because they have fully filled the last orbital, which means they do not need any electrons from others, nor do they have to donate any electron to fulfilled their orbitals.

Elements react with each other by sharing electrons with each other. They either donate or accept electrons from others and form bonds with each other.

Thus, the correct option is C. They all have eight valence electrons in their outer shell.

To learn more about noble gases, refer to the link:

https://brainly.com/question/11764545

#SPJ2

Answer:

1. Fossil Fuels

2. Burning Fossil Fuels

3. Photosynthesis

4. Plants

5. Deforestation

6. Rivers

7. Atmosphere

Explanation:

I am only sure about 1, 2, and 6 because it is very blurry.

Hope this helped!

streak, hardness, crystal form

reaction with acid, magnetism, specific gravity, tenacity, taste, odor , feel, and presence of striations

Answer:

3. Mohs hardness scale

4. Streak

5. Density

6. Crystal

Explanation:

I hope this helps :)

Answer:

4

Explanation:

wind is used to run wind mills

solar the sun ray are converted into electricity using solar panel

water produces hydropower

Answer: Ionic

Explanation:

Answer:

YOu fart

Explanation:

gas