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Answer: Hydrogen

Explanation: The Bohr Atom is a very simplified model of the electron positions of each element of the Periodic Table. Each Row of the periodic table is represented by an orbit. Hydrogen and Helium are in the first energy level (row) of the periodic table and their Bohr Models would have one orbit.

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Answer:

i believe its A but im not sure

its the only one that makes any sense

plz mark  brainliest

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Explanation:

Answer:A

Explanation:

Answer:

Many things, but i think a toaster...

Explanation:

Landslides happen when it rains making the ground heaver and more likeable to a landslide.

Answer:

liquid

Explanation:

Answer:

If the cart accelerates at 3.5m/s2, what is the net external force exerted by the vendor? Given: Solution: m= 13kg F=ma a= 3.5m/s2 =13kg x 3.5m/s2 Find: =45.5kg*m/s2 or 45.5 N Fnet The net force exerted by the vendor was 45.5N. 4. 2.

Explanation:

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Answer:

The mass of 2.0 mol of C02 is 44 grams

Explanation:

The weight of CO2 is 44 grams per mole (1 x 12 grams/mole for the carbon and 2 x 16 grams/mole for the oxygen atoms)

According to the mole concept, the mass of 2.0 mole of carbon dioxide is 88.02 u.

Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons.Molar mass has units of gram per mole . In case of molecules, where molar mass  in grams present in one mole  of atoms is its atomic mass.

Mass can be calculated by the number of moles formula as,

mass=number of moles×molar mass

=2×44.01=88.02 u.

Thus, the mass of 2.0 mole of carbon dioxide is 88.02 u.

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Answer:

Nitrogen = 15

Hydrogen = 60

Phosphorus = 5

Answer: uh

Explanation:

Explanation:

The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12. The mole is defined in terms of the physical properties of a real object, the carbon atom. Therefore it is a base unit. ...

Answer:

the nucleus of an atom consistens of protons and neutrons

Answer:

0.0504

Explanation:

The study of chemicals is called chemistry. The reaction that needs heat to complete the reaction is called an endothermic reaction.

The correct answer to the question is mentioned as follows:-

After solving the question, the correct answer is 0.504 on average of the year.

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Answer-

Fish are obviously animals because they move, they have sensory organs (eyes, mouth, barbels), and they have body structure (skeletons, skin, etc.). They breathe oxygen. They eat other organisms to survive. Fish are different from other animals because they live in water.

Answer:

The surface fish live near the surface of the water, and the blind cave fish live in dark subterranean caves. The surface fish have eyes and pigmentation on their bodies. The blind cave fish don’t have eyes, and they’re often albinos.

the answer is thermal.......

Answer:

The density in kg/m³ = 1.14 x 10⁴

Density is a quantity derived from the mass and volume  

Density is the ratio of mass per unit volume  

With the same mass, the volume of objects that have a high density will be smaller than objects with a smaller type of density  

The unit of density can be expressed in g/cm³ or kg/m³  

Density formula:  

[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]

ρ = density , g/cm³ or kg/m³  

m = mass  , g or kg

v = volume  , cm³ or m³  

A density of Lead : ρ = 11.4 g/cm³

the density in kg/m³ :

[tex]\tt 11.4~\dfrac{g}{cm^3}\times \dfrac{kg}{10^3~g}\times \dfrac{cm^3}{10^{-6}~m^3}=\boxed{\bold{1.14\times 10^4~\dfrac{kg}{m^3}}}[/tex]

Answer:

The overall charge of an atom is zero. ... The charge from a proton or electron are of equal strength, therefore if an atom has an equal number of protons and electrons, it will be electrically neutral. However, atoms are not always electrically neutral, in which case they are called ions.

Explanation:

Sorry if it's wrong!!!!

Answer:

thermal energy

Explanation:

the sun used thermal energy to melt the icecream

Answer: is A

Explanation:

how becuase i just take the test

Answer:

A

Explanation:

Answer:

B

Explanation:

i think with exothermic reactions heat is released

this is what i looked up

hope this helps i took chem last year and think this is what i learned

Considering the definition of exothermic and endothermic reactions, the correct answer is second option: the reaction is endothermic.

Energy is the ability to do work or to produce heat.

Remembering that chemical reactions involve a reorganization of atoms between substances with breaking or formation of chemical bonds, this formation or breaking of chemical bonds is accompanied by changes in the energy of the system.

Chemical reactions that release heat are called exothermic. That is, an exothermic reaction is one where energy flows out of the system.

So, at room temperature, the heat released by a chemical reaction is enough to cause a rise in temperature.

An endothermic reaction is one that requires heat to take place. In other words, a chemical reaction is endothermic when it absorbs energy from the environment.

In this case, the heat is transferred from the outside to the inside of the system. By absorbing heat, the effect of an endothermic reaction is to lower the temperature.

When ammonium chloride is dissolved in water, the beaker gets cold. That means the system is absorbing heat from the surrounding and the temperature does down.

So, the correct answer is second option: the reaction is endothermic.

Learn more about endothermic and exothermic reactions:

Answer:

Na₂SiO₃

Explanation:

Answer:

B: -4

Explanation:

0.000978

0.00978(x10)

0.0978(x10x10)

0.978(x10x10x10)

9.78(x10x10x10x10)

9.78 X (10^4)

9.78X10^-4

because you move the decimal to the left it becomes negative 4

Move the decimal so there is one non-zero digit to the left of the decimal point. The number of decimal places you move will be the exponent on the 10  If the decimal is being moved to the right, the exponent will be negative. If the decimal is being moved to the left, the exponent will be positive.

Answer: Robert Millikan

Explanation: Robert Millikan was the first person to perform the oil drop experiment. It was done many centuries ago. Hope this helps you!

Answer:

c or b

Explanation:

it is not d because my cats sleep all night

it is not a because i like cats but my friend loves dogs

Answer:

Answer is C

Explanation:

are cats more active at night than the day?

Answer:

Electrons

Explanation:

Answer:

Explanation:

To find the mass given the force and acceleration we use the formula

[tex]mass = \frac{force}{acceleration} \\ [/tex]

From the question

force = 20 N

acceleration = 4 m/s²

We have

[tex]mass = \frac{20}{4} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

b

Explanation:

plz mark brailest

Answer:

b. k+

Explanation:

Answer:

action-reaction force.

Explanation:

the pair of opposite but equal forces that two objects exert on each other. weight. the gravitational force exerted by a large body, usually Earth, on an object.

Answer:

exerted forces

Explanation:When an object has several forces acting on it, the effects of force is same as one force acting on the object in a certain direction and this overall force is called the ‘resultant force’.

Answer:

C

Explanation:

4.They are different states of the same pure substance