Please help me and I’ll give you brainiest!!!!!!!!!



Have a wonderful day!!:)))

Answer: 45

Explanation:

mass number = number of protons and neutrons

atomic number = number of protons

to find neutrons subtract atomic number from mass number

so 80 - 35 = 45 neutrons

Answer:

ight i'll answer both rq

Explanation:

a. Rub the magnet along the nail or knitting needle. Now try picking up the paper clip or

tack. Could your nail pick it up? How many can it pick up at once?

after rubbing the magnet with the nail, it could pick up 7 small paper clips.

b. Now try to make your magnet stronger by rubbing the magnet along the nail or knitting

needle for a longer time. Rub only in one direction, not back and forth. This will increase

the number of atoms that line up with the magnet. Try to pick up paper clips or

thumbtacks. How many can it pick up now?

after rubbing it a second time but for a longer period, it could pick up around 10, almost lifting the 11th.

Answer:

A. After rubbing the magnet with the nail, it could pick up 7 small paper clips.

B. After rubbing it a second time but for a longer period, it could pick up around 10 small paper clips, almost lifting the 11th one.

Answer:

reuse

Explanation:

Answer:

A

Explanation The number of energy levels (n) increases, and so does the distance between the nucleus and the outermost orbital. The increased distance and the increased shielding weaken the nuclear attraction, and so an atom can't attract electrons as strongly.

Answer:

it's b

Explanation:

The emission spectrum which is a line spectrum of iodine consists of 6 blue lines as it absorbs yellow light.

Emission spectrum is defined as a spectrum of a chemical compound or substance composed of frequencies of electromagnetic radiation. Radiations which are emitted while electron make transition from higher to lower energy level.

Energy of photon is equal to the difference between the two energy states . There are many possible electronic transitions in an atom and every transition has a specific wavelength.

Collection of different transitions with respect to different wavelengths makes up an emission spectrum.Emission spectrum of each element is unique and therefore spectroscopy is used to identify elements which are present in different substances.

Learn more about emission spectrum,here:

https://brainly.com/question/27268130

#SPJ5

Answer:

Boiling point is one of the answers

Answer:

i agree

Explanation:

Answer:

Explanation:

Aside the boiling point of water, another colligative property that can be used to identify pure water (or not) is the freezing point. Water freezes at 0 °C, but with the presence of impurities, there is a freezing point depression of the water. Thus, if the water is not pure, the liquid could freeze at a temperature lower than 0 °C (with a negative sign like -8 °C).

Answer:

When Sedimentary rocks are buried deep beneath the Earth's surface, great pressure and tremendous heat change these rocks into new rocks containing different minerals. These are Metamorphic rocks.

Explanation:

Answer:

24 atoms

Explanation:

4+10+5+5

Answer:

Noble gases

Explanation:

Answer:

D:2

Explanation:

H is hydrogen, and the subscript represents the amount of atoms it has so H2SO is two hydrogens

Answer:

D. 2 I think, not 100% sure.

Answer:

A lunar eclipse occurs when the Moon passes directly behind the Earth into its umbra (shadow). This can occur only when the Sun, Earth, and Moon are aligned exactly with the Earth in the middle. Hence, a lunar eclipse can only occur the full moon phase

Explanation:

please mark me brainlist

Answer:

A sun

Explanation:

because sun has heat and gives light

Answer: Crocodiles and tigers both have four legs

Explanation: Even when sharks and tigers are both meat eaters, the question is about similarities between tigers and crocodiles, so D is out. A is about crocodiles and sharks, so it's out also. B suits for sharks too, so it's out too. C is the most suitable answer, because both animals have four legs, which means that they belong to the group of quadrupede animals.

Answer:

Crocodiles and tigers both have four legs

Explanation:

Answer:

when elements from A bond with elements from B

Explanation:

The elements in part A are metals and that of B are non-metals. Ionic bonds are formed between metals and non-metals. Thus option b is correct.

An ionic bond is  formed between a metal and non-metal through loss of electron from the metal to the non-metal. Metals are electron rich and easily loss electrons.

Non-metals are electronegative and they are electron -deficient. They need to gain electrons to attain stability. Therefore non-metals such as oxygen, nitrogen, carbon etc. bonds with metals by gaining electrons from metals.

The positive charge of metal acquired by loss of electron and negative charge of nonmetals acquired by gain of electron attracts electrostatically and form the ionic bond.

The elements from A thus bonds ionically with elements from B.

To find more on ionic bonding, refer here:

https://brainly.com/question/11527546

#SPJ2

Answer:

Do not try to re-light or handle malfunctioning fireworks. Soak both spent and unused fireworks in water for a few hours before discarding.

Answer:

Explanation:

Na₂CO₃ (aq)+ MgCl₂ (aq) =  MgCO₃(s)  +2NaCl (aq)

MgCO₃(s) is the precipitate .

Ionic equation

2 Na⁺¹ + CO₃⁻² + Mg⁺² + 2 Cl⁻¹ = MgCO₃(s) +2 Na⁺ + 2 Cl⁻

net ionic equation

Mg⁺² + CO₃⁻² = MgCO₃ (s) .

The precipitate formed in the reaction has been the magnesium carbonate salt.  The net ionic equation will be: [tex]\rm Mg^2^+\;+\;CO_3^2^-\;\rightarrow\;MgCO_3[/tex].

The mixture of sodium carbonate and magnesium chlorate has been given as:

[tex]\rm Na_2CO_3\;+\;MgCl_2\;\rightarrow\;MgCO_3\;+\;NaCl[/tex]

[tex]\rm Na_2CO_3\;(aq)\;+\;MgCl_2\;(aq)\;\rightarrow\;MgCO_3\;(s)\;+\;2\;NaCl\;(aq)[/tex]

[tex]\rm Na_2CO_3\;\rightarrow\;2\;Na^+\;+\;CO_3^2^-[/tex]

[tex]\rm MgCl_2\;\rightarrow\;Mg^2^+\;+\;2\;Cl^-[/tex]

[tex]\rm MgCO_3\;\rightarrow\;Mg^2^+\;+\;CO_3^2^-[/tex]

[tex]\rm NaCl\;\rightarrow\;Na^+\;+\;Cl^-[/tex]

The ionic equation for the reaction will be:

[tex]\rm 2\;Na^+\;+\;CO_3^2^-\;+\;Mg^2^+\;+\;2\;Cl^-\;\rightarrow\;MgCO_3\;+\;2\;Na^+\;+\;2\;Cl^-[/tex]

[tex]\rm Mg^2^+\;+\;CO_3^2^-\;\rightarrow\;MgCO_3[/tex]

For more information about the net ionic equation, refer to the link:

https://brainly.com/question/22885959

Answer:

Li2O+H2O---->(2)LiOH

Explanation:

you have to balance the equation and not all the blanks have to be filled all the time but if it makes it easier for you in the first 2 question marks you can put a 1 which isnt necessary but if ur a visual person it will help.

hope this helps im litterally learning the same thing as u lol

Answer:

1,1,2

Explanation:

this was correct for me, if it wasnt correct check if youre on the right question

Answer:

Conductive heat transfer is most likely responsible for the cooling of the magma

Explanation:

The Earth's core is continuously cooling due to human's digging, allowing for more space and heat escape from the Earth's core. All magma closer to the core would have its heat absorbed by the core, hereby increasing its coolness.

This heat transfer process is common to conduction.

I hope this was helpful.

Answer:

Explanation:

so, limiting reactants are the reactant which limit the continuing of the reaction or in simple word they are the element that run out first and are totally consumed

equation :

2koh+h2so4⇒ k2so4 +2h2o

if we have 4 mol of h2so4 and 3 mol of 2koh

                 number of produced moles of k2so4 on consuming all :

h2so4 ⇒ k2so4

1 mol          1 mol

4 mol            ?mol

no of mol of k2so4 if all h2so4 is consumed 4 mol

2koh⇒ k2so4

2 mol       1 mol

3 mol         ?mol

no of mol of k2so4 if we consume all koh = 1.5 mol

since the koh produces less mol on consuming it all

the koh is the limiting reactant

Answer:

NH₄Cl    ⇄      NH₃   +    HCl

Explanation:

The formula equation shows a reversible reaction is:

NH₄Cl(s) ⇄ NH₃(g) + HCl(g)

Let's consider which formula equation shows a reversible reaction.

The single arrow indicates that this is an irreversible reaction.

The single arrow indicates that this is an irreversible reaction.

The double arrow indicates that this is a reversible reaction.

The single arrow indicates that this is an irreversible reaction.

The formula equation shows a reversible reaction is:

NH₄Cl(s) ⇄ NH₃(g) + HCl(g)

Learn more about reversible reactions here: https://brainly.com/question/11114490

Answer:kj

Explanation:nnn

Answer:

Nitrogen (ii) oxide

Explanation:

To know the IUPAC name for NO, we shall determine the oxidation number of N in NO.

NOTE: The oxidation number of oxygen (O) is always – 2.

Thus the oxidation number of N in NO can be obtained as follow:

N + O = 0 (ground state)

N + (– 2) = 0

N – 2 = 0

Collect like terms

N = 0 + 2

N = +2

Thus, the oxidation number of Nitrogen (N) in NO is +2.

Therefore, the IUPAC name for NO is Nitrogen (ii) oxide

Answer:

nitrogen monoxide

Explanation:

for those taking quiz on edge

Explanation:

ion

valence electrons

isotope

covalence

ionic

Answer:

Initial pressure = 157 kpa (Approx)

Explanation:

Given:

final temperature = 234 K

final pressure = 210 kpa

Initial temperature = 175 K

Find:

Initial pressure

Computation:

Initial pressure / Initial temperature = final pressure / final temperature

Initial pressure / 175 = 210 / 234

Initial pressure = 157 kpa (Approx)

Answer:

9 moles of O²

Explanation:

Hope this helped,

Philip

Brainliest always appreciated! <3