URENT URENT URENT HELP PLEASE

Answer:

D

Explanation:

Answer:

i have no idea and i dont get it

Answer: yes

Explanation:   cut open their head and spray their head with windex. THAT SIMPLE

Answer:

A

Explanation:

A conversion factor is used to change the units of a measured quantity without changing its value.

Unit conversion is very important because the rest of the world other than three contries uses the metric system. So, converting unitsis important in science because it uses the metric system. The metric system are measurements like cm, m, l, mL, etc.

Answer:

B.The Chocolate Chip Model

Explanation:

Answer:

Explanation:1 mole is equal to 1 moles CaCO3, or 100.0869 grams.

Answer:

D

Explanation:

Answer:

145.97×10²³ atoms

Explanation:

Given data:

Number of moles of CO₂ = 8.08 mol

Number of atoms of CO₂ = ?

Solution:

1 mole of CO₂ contain 1 mole C atom.

8.08 mole contain 8.08× 1 = 8.08 mole of C atom.

1 mole of CO₂ contain 2 moles of O atom.

8.08mole contain 8.08×2 = 16.16 mole of O atom.

Total number of moles of atoms = 8.08 mole + 16.16 mole

Total number of moles of atoms = 24.24 mol

Number of atoms of CO₂:

1 mole of any substance contain 6.022×10²³ atoms.

24.24 mol ×6.022×10²³ atoms / 1 mol

145.97×10²³ atoms

Answer:

false

Explanation:

Answer:true

Explanation:

Answer: They are non-reactive and don't conform with other elements to form compounds. Because they are non-reactive, they don't corrode easily.

Explanation:

The  properties of gold and platinum  which make these metals desirable for jewelry is due to their electronic configuration due to which they are non-reactive and do not corrode easily.

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

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Answer:

6

Explanation:

Answer:

25 atoms

Explanation:

Given data:

Total number of atoms = 400 atom

Atoms remain after 4 half lives passed = ?

Solution:

At time zero = 400 atom

At first half life = 400 atom/2 = 200 atom

At 2nd half life = 200 atom/2 = 100 atom

At 3rd half life = 100 atom/2 = 50 atom

At 4th half life = 50 atom/2 = 25 atom

Thus, 25 atoms are remained after 4 half lives.

25 atoms of the radioactive atoms will remain after 4 half lives.

    Given in the question,

Expression for the amount remaining of a radioactive element after 'n' half lives is given by,

[tex]N=N_0(\frac{1}{2})^n[/tex]

Here, [tex]N_0=[/tex] Initial amount

[tex]n=[/tex] Number of half lives

By substituting the vales of [tex]N_0[/tex] and [tex]n[/tex] in the question,

[tex]N=400(\frac{1}{2})^4[/tex]

   [tex]=\frac{400}{16}[/tex]

   [tex]=25[/tex]

        Therefore, 25 atoms of the radioactive atoms will remain after 4 half lives.

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Answer:

.

Explanation:

Answer:

A

Explanation:

A hydroxide ion is given as:

       OH⁻

The electron dot notation shows only the chemical symbol of the element surrounded by dots to represent the valence electrons. The chemical symbol denotes the nucleus and all electrons except the valence electrons.

The dots are arranged on the four sides in pairs.

Oxygen is made up of 6 valence electrons, and since the ion has a net negative charge, the hydrogen and oxygen achieved their stable configuration this way.

(I) [tex]H_2SO_4+ 2NaHCO_3--> Na_2SO_4 + 2 H_2O + 2CO_2[/tex]

(II) [tex]H_2+I_2 --> 2HI[/tex]

(III) [tex]2NaOH+H_2SO_4--> Na_2SO_4+ 2H_2O[/tex]

(IV) [tex]2FeSO_4--> Fe_2O_3+SO_2+SO_3[/tex]

(V) [tex]2C_3H_6O_2+7O_2-->6CO_2+6H_2O[/tex]

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

(I) [tex]H_2SO_4[/tex]

(ANS) [tex]98 \frac{grams}{mol}[/tex]

__________________________________________________________

Solution:

Molecular mass of,

H = 1

S = 32

O = 16

Now,

There are 2 atoms of Hydrogen, 1 atoms of Sulfur and 4 atoms of Oxygen present, thus,

[tex]H_2SO_4 = (1x2)+32+(16x4)[/tex]

[tex]H_2SO_4 = 98 \frac{grams}{mol}[/tex]

(II) [tex]CH_4[/tex]

(ANS) [tex]16 \frac{gram}{mol}[/tex]

_________________________________________________________

Solution:

Molecular Mass,

Carbon = 12

Hydrogen = 1

Now

There are 1 atom of Oxygen and 4 atoms of Hydrogen present, thus,

[tex]CH_4 = 12 + (1x4)[/tex]

[tex]CH_4 = 16\frac{grams}{mol}[/tex]

(III) [tex]NH_3[/tex]

(ANS) [tex]17 \frac{grams}{mol}[/tex]

__________________________________________________________

Solution:

Molecular Mass,

Nitrogen = 14 grams

Hydrogen = 1

Now,

There are 1 atoms of Nitrogen and 3 atoms of Hydrogen present, thus,

[tex]NH_3 = 14 + (1x3)[/tex]

[tex]NH_3 = 17 \frac{grams}{mol}[/tex]

56     71

x       35.5

[tex]X = \frac{56 x 35.5}{71}[/tex]

Simplify the equation

X = 28 grams

__________________________________________________________

Answer:

28 grams of Iron(fe) will react with chlorine.

Answer:

4

Explanation:

its a rare element, usually occurring as a product of the spallation of larger nuclei that have collided with cosmic rays

Answer:

I believe it's D

Explanation:

they both are worked a lot and it makes the most sense.

The cells in both bicep muscle and heart muscle make energy for contraction and relaxation. Hence, option B is correct.

Cardiomyocytes have a rather rectangular form and are short and thin. They have a single nucleus, cell organelles that are identical to those seen in skeletal muscle cells, and many sarcosomes, which supply the energy needed for contraction.

Intercalated discs with gap junctions for diffusion and communication link cardiomyocytes structurally. Myofibrils, which in turn are composed of thick and thin myofilaments, make up the sarcoplasm.

Due to their high energy needs, skeletal muscle cells have many mitochondria that enable them to produce enough ATP. Therefore, the cells in the bicep muscles and cardiac muscles produce energy.

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Answer:

nut

Explanation:

Answer:

Nuclear energy powers our businesses, homes and military. America’s 95 operating nuclear reactors generate approximately 20% of our nation’s electricity and provide over half of our carbon-free energy. They also create good-paying jobs at power plants and uranium mines. Wyoming produced 87% of America’s domestic uranium supply in 2018.

Today, nuclear energy faces serious hurdles. Regulatory costs and subsidies for renewable energy technologies are forcing America’s nuclear power plants to close at an alarming rate.

Russia and China are subsidizing their government-owned nuclear companies to assert their energy influence around the world. China is searching the globe for uranium reserves and investing heavily in the countries where it’s found. They want to secure more nuclear fuel for themselves and increase their control of the global supply.

Meanwhile, American nuclear power plants have come to rely on cheap Russian imports of uranium to meet their nuclear fuel needs. Right now, roughly 40% of the uranium coming into the United States originates in Russia or its satellite states of Kazakhstan and Uzbekistan. Russian-backed companies are developing fuel that can be placed directly in American reactors.

Explanation:

Answer:

This question is incomplete but the correct option is B

Explanation:

This question is incomplete because of the absence of the "Reference Table S", however the question can still be answered in the absence of the table. The energy described in the question is the ionization energy (energy required to remove the most loosely bound electron in an atom). This question seeks to know the atom (from the options provided) with the least ionization energy.

Ionization energy increases from left to right across the period because it's easier to remove a single electron (valence electron) from the outermost shell than to remove two electrons from the same shell; thus the more the valence electrons (in a shell), the higher the ionization energy. Thus, bromine (Br) and tin (Sn) have high ionization energies because they have more number of electrons in there outermost shell.

Berylium (Be) and strontium (Sr) are both in the group 2 of the periodic table because they both have 2 electrons in there outermost shell. Ionization energy decreases down a group. This is because the farther an electron is from the nucleus, the weaker the force of attraction between the nucleus and the electron. Thus, strontium (Sr) would have a lesser ionization energy between the two and would indeed have the least ionization among the options provided. Hence, the correct option is B

I dont get what the question is?? im so sorry!

Answer:

It would be the third answer.

Explanation:

This is because over the next few minutes, the heat would radiate away from the atoms in the metal plate and the atoms around the plate would absorb this radiation.

Answer:Naming Covalent compounds

A B

hexaboron silicide B6Si

chlorine dioxide ClO2

hydrogen iodide HI

iodine pentafluoride IF5

Explanation:

Answer:Mole Fraction of NaCl=0.5697

Explanation:

No OF Moles of NaCl=  Mass / Molar mass

=21.7 g/58.44g/mol

=0.371moles

No OF Moles of KCl=  Mass / Molar mass

=3.74g/74.55g/mol

=0.0502moles

No OF Moles of LiCl=  Mass / Molar mass

=9.76 g/42.39g/mol

=0.230moles

Mole Fraction of NaCL = Moles of NaCL/ Total number of moles of the mixture

=0.371/( 0.371+ 0.0502+0.230)

0.371/0.6512

=0.5697

Answer:

Mole fraction: 0.570

Explanation:

Mole fraction is defined as the ratio of moles of a compound in a mixture over the total moles of the mixture. To solve this problem, we need to find moles of the 3 salts:

Moles NaCl -Molar mass: 58.44g/mol-:

21.7g NaCl * (1mol / 58.44g) = 0.3713 moles

Moles KCl -Molar mass: 74.55g/mol-:

3.74g KCl * (1mol / 74.55g) = 0.0502 moles

Moles LiCl -Molar mass: 42.394g/mol-:

9.76g LiCl * (1mol / 42.394g) = 0.2302 moles

Mole fraction NaCl:

0.3713mol / (0.3713mol + 0.0502mol + 0.2302mol) =

0.570

Answer: When I see you again!

Explanation:

Oxygen and glucose are both reactants in the process of cellular respiration. The main product of cellular respiration is ATP; waste products include carbon dioxide and water.

Answer:

D. It prevents charges from building up in the solutions :)

Explanation:

A P E X

Answer: theres 5

Explanation: valence electrons are the electrons in the outer shell. I took that test a few weeks ago :0