a single 3s electron in a magnesium atom is shielded by

a) the 2s and the 2p electrons only

b) the 1s, 2s, and 2p electrons, along with the other 3s electron

c) the 1s, 2s, and 2p electrons

d) the 1s and 2s electrons only​

Answer:

The circulatory system

Explanation:

The human body has two circulatory systems, the pulmonary system, and the systemic system.

Answer:

step 3

Explanation:

electrons have a negative charge which is -1

protons have carry a positive charge +1

neutrons possessing no net charge which is 0

Answer:

Protons are positively charged. When a nucleus emits an alpha particle, these changes happen: the mass number decreases by 4. the atomic number decreases by 2.

Explanation:

Answer:the bonds between the two nitrogen atoms and between each pair of hydrogen atoms

Explanation:

Answer: the bonds between the nitrogen and hydrogen

Explanation: I just did it but it's possible you might have a different question

Answer:

i

Explanation:

Answer:

Newton, symbol N

Answer:

nucleus

Explanation:

Answer:

22.98977

Explanation:

Na is actually sodium and its atomic number is 11.

I'm not sure if this is multiple choice or a question where you have to answer in writing but here is the mass of Na 22.98977.

Hope this helps

Answer:

3Ca₍s₎ + 2FeCl₃ ------------------------------------------------------------->  3CaCl₂ + 2Fe₍s₎.

Explanation:

Iron(III) chloride is also known as Iron trichloride and it has the molar mass value of 162.2 g/mol and density of 2.9 g/cm³.

The balanced equation for the chemical reaction between solid calcium and iron (III) chloride is given below as:  

3Ca₍s₎ + 2FeCl₃ ------------------------------------------------------------->  3CaCl₂ + 2Fe₍s₎.

This kind of chemical reaction is known as single displacement reaction or single replacement reaction.

Answer:

35.5

Explanation:

Given parameters:

Abundance of chlorine Cl  - 35 = 75%

Mass of Cl - 35 = 35

Abundance of Cl - 37  = 25%

Mass of Cl - 37 = 37

Unknown:

Relative molecular mass  = ?

Solution:

The relative molecular mass of the chlorine can be deduced using the expression below:

   Relative molecular mass  = (abundance x mass of Cl - 35) + ( abundance x mass of Cl - 37)

 Relative molecular mass  = (75% x 35) + (25% x 37)  = 35.5

Answer:

B) infrared im pretty sure

Answer:

Infrared

Explanation:

Answer:

both

Explanation:

because equilibrium means that both sides of the reaction are equal

The concentration of the products is high at equilibrium if Keq is a large number (Keq > 1). The reaction in this instance encourages the production of products. The concentration of the reactants is high at equilibrium if Keq is a small number (Keq1).

Chemical equilibrium is the condition where both the reactants and products are present in concentrations that have no further tendency to change over time, preventing any discernible change in the system's properties.

The size of a reaction when it is at equilibrium is represented by the equilibrium constant, K. It creates a ratio using the concentrations and coefficients of each reactant and product.

K is regarded as intermediate if it is larger than or equal to 0.001 but less than or equal to 1000. Significant quantities of reactants and products will be present. When the equilibrium constant K is big, products predominate at equilibrium, but when it is small, reactants predominate.

Thus, The concentration of the products is high at equilibrium if Keq is a large number.

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Answer:

X

Explanation:

because it is the greatest

Answer:

B. Gradualism

Explanation:

Answer:

cosmetics factory

Explanation:

The company owned by Hsaio has been most likely to be the cosmetic factory. Hence, option B is correct.

A cosmetic manufacturer is a company that manufactures cosmetic items. The products manufactured by the cosmetic industry include soap, shampoo, and toothpaste that smell good, such as perfume and deodorant.

The cosmetic industry products are formed to be viscous in nature, in order to be applied with ease in personal care. Calcium chloride has been the chemical agent that has been mediating to add viscosity to cosmetic products.

Since, Hsaio has been incorporating most of the budget of his company over calcium chloride, a product used in the cosmetic industry. Thereby he is most likely to own a cosmetic factory. Hence, option B is correct.

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Answer:

f = 6 × 10^15 Hz in the ULTRAVIOLET (UV) region

Explanation:

Using λ = v/f

Where;

λ = wavelength (m)

v = speed of light (3 × 10^8m/s)

f = frequency (Hz)

According to this question, λ = 5.00 x 10^-6 cm

= 5.00 x 10^-8 m

λ = v/f

f = v/λ

f = 3 × 10^8 ÷ 5.00 x 10^-8

f = 0.6 × 10^(8+8)

f = 0.6 × 10^16

f = 6 × 10^15 Hz

In the electromagnetic spectrum (EM), a frequency of 10^15 is found in the ULTRAVIOLET region. This means that this radiation with a wavelength of 5.00 x 10^-6 cm and frequency of 6 × 10^15 Hz is in the ULTRAVIOLET region of the EM spectrum.

Answer:

A. A skin cell has a less complex structure than skin tissue has.

Explanation:

A skin cell has a less complex structure than skin tissue has. Hence option A is correct.

Cell is defined as the smallest unit that can sustain life on its own and makes up all living things, including the body's tissues. The three essential parts of a cell are the cell membrane, nucleus, and cytoplasm. From bacteria to humans, cells give all living things their structure and functionality.

The tiniest, structurally and functionally distinct, and typically microscopic, unit of an organism is called a cell. The several forms of material made up of specialized cells and their byproducts are referred to as tissues. Cells are very small. The size of tissues is macro.

Thus, a skin cell has a less complex structure than skin tissue has. Hence option A is correct.

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Answer:

2Al +3Fe(NO3)2 --------> 3Fe + 2Al(NO3)3

In the above reaction Aluminum and iron nitrate reacts to produce iron metal and aluminum nitrate so aluminum is replace by iron

Answer:

B. Its direction changes, it's speed changes, and it's wave length changes.

Explanation:

If not, I'm sorry I'm not that smart or it might be d. I don't know

Answer: no one needs this anyway

Explanation:

Answer:

C )The part of the container in contact with the solution is coated with copper.

Explanation:

To understand the answer to the question, we must have a good knowledge of the electrochemical series.

Remember that iron is above copper in the electrochemical series. This means that iron can replace copper in an aqueous solution of a copper salt.

The following reaction occurs in the container;

Fe(s) + CuSO4(aq) -----> FeSO4(aq) + Cu(s)

This is why the part of the solution in contact with the container becomes coated with copper.

Answer:

8.3lb of fat were removed

Explanation:

To solve this problem we need to convert the liters of fat removed to mL. Using the mL and density we can find the grams. To convert grams to pounds we must use (1lb = 453.592g):

mL fat:

4.0L * (1000mL / 1L) = 4000mL

g fat:

4000mL * (0.94g / mL) = 3760g of fat

lb fat:

3760g of fat * (1lb / 453.592g) =

Answer:

detail is given below.

Explanation:

Charles Law:

According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.

Mathematical expression:

V₁/T₁ = V₂/T₂

V₁ = Initial volume

T₁ = Initial temperature

V₂ = Final volume  

T₂ = Final temperature

It means when we increase the temperature volume is also goes to increase and vice versa.

Let's consider the example,

V₁/T₁ = V₂/T₂

V₂ = V₁T₂/T₁  

V₂ = 4.5 L × 348 K / 298 k

V₂ = 1566 L.K / 298 K

V₂ = 5.3 L

We can see when temperature is increase from 298 K to 348 K volume is also increased from 4.5 L to 5.3 L.

Answer:

b is the answer have a good day

Answer:

C. heat from the water moving through the cooler air  

I think it's C because when something cools down, it has to reach a point of thermal equilibrium with the matter (in this case air) around it. So heat transfer happens through convection from the heat in the pan to the cooler surrounding air. The heated air becomes less dense and rises, while cooler air, sinks to the surface of the water, gets heated, and rises. This convection cycle keeps happening until the water in the pan is around the same temperature with the air around it.

3 half-lives have occured

Given

Half-life Radon-222 = 3.8 days

12.5% of Rn-222 remains

Required

Half-lives  occurred

Solution

General formulas used in decay:  

[tex]\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{t/t\frac{1}{2} }}}[/tex]

T = duration of decay  

t 1/2 = half-life  

N₀ = the number of initial radioactive atoms  

Nt = the number of radioactive atoms left after decaying during T time  

12.5% of Rn-222 remains ⇒ Nt/No = 0.125

Input the value :

[tex]\tt 0.125=\dfrac{1}{2}^{t/3.8}\\\\\dfrac{1}{2}^3=\dfrac{1}{2}^{t/3.8}\\\\3=t/3.8\\\\t=11.4\rightarrow 3~half-lives[/tex]