A scientist studying stars can estimate the temperatures of stars by their?

Answer:

Heat, Q = 262 kJ

Explanation:

Given that,

Mass of a sample, m = 750 g

Initial temperature, [tex]T_i=95^0\ C[/tex]

Final temperature, [tex]T_f=17^0\ C[/tex]

The specific heat of the sample, [tex]c=4.18\ J/g^0 C[/tex]

We need to find the amount of heat released. The amount of heat released is given by the formula as follows :

[tex]Q=mc\Delta T\\\\Q=750\times 4.48\times (17-95)\\\\Q=-262080\ J\\\\Q=-262\ kJ[/tex]

So, 262 kJ of heat is released by the sample.

Answer:

Please find attached the completed Lewis dot diagram structure for PI₂F

Explanation:

The number of valence electrons are;

Phosphorus = 5 Electrons

Iodine = 2 × 7 electrons = 14 electrons

Chlorine = 7 electrons

The total number of valence electrons = 14 + 7 + 5 = 26 electrons

2) We draw the symbol that represents the basic (general) structure of the molecule as follows;

The sheared electron pair are represented by single bond lines

3) We complete the octet structures round the fluorine and the iodine atoms as attached showing 18 electrons plus 6 shared electron pairs, with a maximum from step 2 to give a total of (18 + 6) 24 electron pairs

4) We add the 2 unaccounted valence electron on the phosphorus atom to give it the stable octet structure, which gives the completed Lewis structure

Answer:

A

Explanation:

learned this in biology

Answer:

5

Explanation:

They all matter unless it is a decimal.

Answer:

transitive ​physicsif something conducts heat or electricity, heat or electricity can move through it.

Explanation:

Hello good afternoon...God bless here is the answer to your following question-

definition of conduct (in physics)- transitive ​physics if something conducts heat or electricity, heat or electricity can move through it.

Answer:

1. small intestine: digestive system

2. blood vessels: cardiovascular system

3. lungs: respiratory system

4. tricep: muscular system

5. spine: skeletal system

Answer:

1. small intestine: digestive system

2. blood vessels: cardiovascular system

3. lungs: respiratory system

4. tricep: muscular system

5. spine: skeletal system

Explanation:

Answer:

I think you meant metabolism

Explanation:

me·tab·o·lism

the chemical processes that occur within a living organism in order to maintain life.

Answer: I’m guessing you meant metabolism. Metabolism is the chemical reactions in the body's cells that change food into energy. Our bodies need this energy to do everything from moving to thinking to growing. Specific proteins in the body control the chemical reactions of metabolism.

Answer:

Some molecules, such as carbon dioxide and oxygen, can diffuse across the plasma membrane directly, but others need help to cross its hydrophobic core. In facilitated diffusion, molecules diffuse across the plasma membrane with assistance from membrane proteins, such as channels and carriers.

Molecules that are too large to flow across the membrane need help from integral proteins.

Some molecules are too large to diffuse through the membrane channels and too lipid insoluble to diffuse through the phospholipid layer.

Such is the case with glucose and some other monosaccharides,these substances, however, can cross the plasma membrane through the facilitated diffusion process.

The transport of these molecules depends on integral membrane proteins that act as transporters, transferring the molecules to one side of the membrane and the other without coming into contact with its hydrophobic interior.

Intrinsic or integral proteins constitute more than 70% of the total and are totally or partially included within the lipid matrix of the membrane maintained by hydrophobic interactions.

When they are arranged along the membrane, they are called transmembrane, they can pass totally or partially through the bilayer, sticking out one or both of its surfaces.

There are pores and channels in the membrane to pass substances to the interior and exterior of the cells formed by transmembrane proteins.

The passage of ions through ion channels is faster than through "carrier" proteins, since it does not require the union of the ion with the pore protein.

Therefore, we can conclude that molecules that are too large to flow across the membrane need help from integral proteins.

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Answer: Covalent bonding occurs when pairs of electrons are shared by atoms. Atoms will covalently bond with other atoms in order to gain more stability, which is gained by forming a full electron shell.

Explanation: I hope that helped and Happy friday.

Answer:

Partial pressure of gas = 0.913 mmHg

Explanation:

Since the column of water in the tube is higher than in the container, it means that the atmospheric pressure is greater than the gas pressure.

Also, since the gas is collected over water, the total gas pressure is due to partial pressure of the gas and the partial pressure of water vapor, i.e.,

Hence, Partial pressure of gas = Patm - Pressure due to height of water column - Partial pressure of water

Pressure due to height of water column = 55 mmH₂O

Since 13.595 mmH₂O = 1 mmHg

55 mmH₂O = 55/13.595  mmHg

Converting to 55/13.595  mmHg to atm

Pressure due to height of water column = (55/13.595  mmHg) * (1 atm/760 mmHg) = 0.00532

Partial pressure of gas = (0.950 - 0.00532 - 0.0313) atm

Partial pressure of gas = 0.913 mmHg

Answer:

1 mole of any gas at STP occupies 22.4 liters of volume. Using this information, the volume occupied by any number of moles (or grams) can be determined.

Explanation:

There will be 22.4 liters of oxygen, which will be 5.00 moles of oxygen occupied at STP.

The International System of Units uses the mole (symbol: mol) as the unit of material quantity. How many elementary entities of a particular substance are present in an object or sample is determined by the quantity of that material.

The chemical element with the atomic number 8 and symbol O is called oxygen. It belongs to the periodic table's chalcogen group, is a very reactive nonmetal, and is an oxidizing agent that easily produces oxides with most elements as well as other compounds.

1 mole of any gas at STP occupies 22.4 liters of volume. Using this information, the volume occupied by any number of moles (or grams) can be determined.

Therefore, at STP, 5.00 moles of the available 22.4 liters of oxygen will be occupied.

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Answer:

A. structural adaptation

Explanation:

Hope This Helps!!

God Bless!!

~DuffyDuck~

Answer:

ummmmmmmmmmmmmmmmmmmmmmmm

Answer:

????????????

Explanation:

ummmmmmmmm

Answer:

a

Explanation:

because look at the pic of the flower

Answer:

a

Explanation:

Answer: oxygen

Explanation: because we need it to live ;)

Answer:

(2) oxygen

Explanation:

Answer:

Probably the one you are already dating...

Explanation:

...but if you really like the other guy then you should chose him.

Answer:

Chlorine has 7 valence shell electrons, 2 in the 3s orbital and 5 in the 3p orbital. Since a full shell of valence electrons (8) is the most stable configuration, chlorine tends not to lose electrons but to gain one electron to fill the final 3p orbital and give it 8 valence electrons like its neighboring noble gas argon

Explanation:

i hope this helped

Two or more than two atoms with different physical or chemical properties can not combine together to form an element. The element which has 7 valence electrons on it's 5th energy level is Iodine.

Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.

Valence shell is the last shell to which electrons are being filled. Since 7 valence electron are present in 5th shell of the element. So, we know that in whole periodic table group 17 or halogen family contains 7 electrons in its valence shell. 5th energy represents the number of period. So, the given element is Iodine.

The electronic configuration of Iodine is

[Kr] 4d¹⁰ 5s² 5p⁵

Therefore, the element which has 7 valence electrons on it's 5th energy level is Iodine.

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Answer:

4NO2 + 2Na2O + O2 → 4NaNO3

Answer:

the concentration of hydrochloric acid

the temperature in heating

Answer:

5

Explanation:

A lithium atom with an atomic number of 3 and a charge of -2 will have a total number of electrons.

The atomic number is the number of protons in an atom. For a neutral atom that has not gained or lost electrons, the atomic number is the same as the number of electrons.

   neutral atom: atomic number of electrons

For neutral atom of lithium, we will have 3 electrons

Now, lithium with a charge of -2 has gained two more electrons to the original 3 this now makes it 5.

ii.

It is an anion because it is negatively charged.

Negatively charged particles are called anion.

Answer:

Explanation:

The thermosphere is often considered the "hot layer" because it contains the warmest temperatures in the atmosphere. Temperature increases with height until the estimated top of the thermosphere at 500 km. Temperatures can reach as high as 2000 K or 1727 ºC in this layer (Wallace and Hobbs 24).

Answer:

Positive

Explanation:

For the most effective hot pack, the temperature change should be positive.

Hot packs are generally utilized for their heat-producing abilities. Hence, the reactions leading to the activation of hot packs are usually exothermic, that is, heat energy generating. In other words, positive or increased temperatures must be generated when hot packs are activated.

This is unlike cold packs which are utilized for the cold-generating abilities. Reactions leading to their activations must be endothermic, that is, heat-absorbing.

Answer:

Explanation:

i = 7.58 × 10 to the -4 power

j = 4.573 × 10 to the sixth power

k = 3.438 × 10 to the -2 power

h = 5 × 10 to the third power

hope this helps!

Answer:

The electrons are supplied by the species getting oxidized. They move from anode to the cathode in the external circuit. The external battery supplies the electrons. They enter through the cathode and come out through the anode

The electrons are supplied by the species getting oxidized. They move from the anode to the cathode in the external circuit.

An electron is a negatively charged subatomic particle.

The reaction at the anode is oxidation and that at the cathode is reduction. Here, the anode is positive and the cathode is the negative electrode. The reaction at the anode is oxidation and that at the cathode is reduction.

The electrons are supplied by the species getting oxidized. They move from the anode to the cathode in the external circuit. The external battery supplies the electrons. They enter through the cathode and come out through the anode.

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Explanation:

Neutron - no charge, located in the nucleus.

electron - - charge, located outside the nucleus.

Quark- smallest theoretical particles of protons and neutrons.

proton- + charge, located in the nucleus.

Answer:

Fungi, or D

Explanation:

Answer:

glass your welcome

Explanation:

Answer:

See explanation

Explanation:

The third and fourth elements in the first transition series are vanadium and chromium. They contain 23 and 24 electrons respectively.

In universe L, the electron configuration of vanadium is;

[X]  3d3 4s2

In universe L, the electron configuration of chromium is;

[X] 3d4 4s2

The electron configuration of chromium has to change since there are four instead of five d orbitals in universe L.

Answer:C

Explanation:

Because they use it so that they can find more information about it.

What scientists use to describe a constellation: C. It’s star pattern

A star is a giant astronomical or celestial object that comprises a luminous sphere of plasma and bounded together by its own gravitational force.

Generally, a star is typically made up of two (2) main hot gas and these are Hydrogen (H) and Helium (He).  Some examples of a star are;  

A galaxy can be defined as a collection (group) of many billions of stars, which are existing independently. Thus, the greatest number of stars are found in a galaxy.

A constellation can be defined as a collection (group) of visible stars forming a recognizable or perceived pattern in the sky. Also, this pattern or outline is sometimes attributed by scientists to a mythological figure.

In conclusion, scientists use the pattern of a star to describe a constellation.

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