what is the answer to this^​

Answer:

i need help too

Explanation:

helppp

Answer:

C

Explanation:

Because 2 x n square gives the total energy level been absorbed = 2 x16

=32

Answer:

Alkali metals are: Lithium(Li), Sodium(Na), Potassium(K), Rubidium(Rb), Cesium(Cs) and Francium(Fr).

Explanation:

I cant understand your question mate, but these are all the alkali metals, because they are in the first group. Note that Hydrogen(H) is not an alkali metal. Hope that helps. God bless you.

The alkali metals are  lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).

The periodic table has been the arrangement of the elements based on the reactivity and the electrons in the valence shell.

The left side of the periodic table has been consisted of the metals, while moving from left to right the metallic character decreases and the nonmetallic character increase.

The group 1 of the periodic table has been consisted of the metals with 1 valence electrons. The group has been termed as alkali metals, as the reaction of the elements of this group with water forms alkali.

The elements belonging to group 1 of the periodic table are  lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).

Learn more about periodic table, here:

https://brainly.com/question/11155928

Answer:

[tex]P=35.16[/tex]

[tex]Z=4.6[/tex]

Explanation:

Hello,

In this case, since the VdW equation is:

[tex]P=\frac{nRT}{V-n*b}-a(\frac{n}{V} )^2[/tex]

Since the moles are 10.0 moles, the temperature in K is 300.15 K and the volume is liters is also 4.860 L (1 dm³= 1L), the pressure exerted by the ethane is:

[tex]P=\frac{10.0mol*0.082\frac{atm*L}{mol*K}*300.15K}{4.860mol-10.0mol*0.0651\frac{L}{mol} }-5.507\frac{atm*L^2}{mol^2}(\frac{10.0mol}{4.86L} )^2\\\\P=58.48atm-23.3atm\\\\P=35.16[/tex]

Thus the compression factor turns out:

[tex]Z=\frac{PV}{RT}=\frac{23.3atm*4.86L}{ 0.082\frac{atm*L}{mol*K}*300.15K}\\\\Z=4.6[/tex]

Regards.

Answer:

The answer is

Explanation:

To find the mass of a substance given the density and volume we use the formula

From the question

Density = 1.122 g/L

volume = 125 mL

We must convert the volume from mL to L

1000 mL = 1 L

125 mL = 0.125 L

volume = 0.125 L

Substitute the values into the above formula and solve for the mass

That's

mass = 1.122 × 0.125 = 0.14025

We have the final answer as

Hope this helps you

Answer:

If it is not proven and if it isn't backed up by any facts or has been proven to be false.

Answer:

The half-life of polonium-210 is approximately 138.792 days.

Explanation:

We must remember that the decay of a radioisotope is modelled by this ordinary differential equation:

[tex]\frac{dm}{dt} = -\frac{m(t)}{\tau}[/tex]

Where:

[tex]m(t)[/tex] - Current mass of the isotope, measured in grams.

[tex]\tau[/tex] - Time constant, measured in days.

Whose solution is:

[tex]m(t) = m_{o}\cdot e^{-\frac{t}{\tau} }[/tex]

Where [tex]m_{o}[/tex] is the initial mass of the isotope, measured in grams.

Our first step is to determine the value of the time constant:

[tex]-\frac{t}{\tau} = \ln \frac{m(t)}{m_{o}}[/tex]

[tex]\tau = -\frac{t}{\ln \frac{m(t)}{m_{o}} }[/tex]

If we know that [tex]\frac{m(t)}{m_{o}} = 0.016[/tex] and [tex]t = 828\,days[/tex], then the time constant of the radioisotope is:

[tex]\tau = -\frac{828\,days}{\ln 0.016}[/tex]

[tex]\tau \approx 200.234\,days[/tex]

And lastly we find the half-life of polonium-210 ([tex]t_{1/2}[/tex]), measured in days, by using this expression:

[tex]t_{1/2} = \tau \cdot \ln 2[/tex]

[tex]t_{1/2} = (200.234\,days)\cdot \ln 2[/tex]

[tex]t_{1/2}\approx 138.792\,days[/tex]

The half-life of polonium-210 is approximately 138.792 days.

Answer:

Some differences between the given particular topics are described below.

Explanation:

Answer:

Freezing point: 32 ºF (0ºC)

Melting point: 32 ºF (0ºC)

Boiling point: 203°F (95°C)

Explanation:

At the boiling point, the vapor pressure of a liquid  equals the external pressure. The normal melting point and boiling point of water at 1 atm are 0°C and 100°C, respectively. Decreasing the pressure under 1 atm (what happens when we are at high altitudes) will lower the boiling point since the external pressure will be lower, and it will become equal with the vapor pressure at a lower temperature.

However, the melting point and freezing point will stay unaffected since they don't depend on air-pressure; so at 0 or 5000 meters they will still be 0°C (remember that, since water is a pure substance, the freezing and melting points will be the same).

Answer: False

Explanation:

resources which are present in unlimited quantity in nature are called as inexhaustible natural resources.

Explanation:

An object can possess energy in tow ways by it's motion or position

Answer:

a. NO2

b. NH3

c. CO2

Explanation:

a. For the pair of compounds CO2 or NO2 the one with the highest boiling point is __________ .

The answer is NO2. It has a higher boiling point than CO2 because it exhibits dipole-dipole interactions.

b. For the pair of compounds NH3 or CH4 the one with the highest boiling point is _________

NH3 has a higher boiling point compared to CH4. This is due to the presence of the hydrogen bonds in NH3,

c. For the pair of compounds CS2 or CO2 the one with the highest boiling point is _________

CS2 has a higher boiling point than CO2. This is because of the high molecular mass of CS2.

Answer:

2 differet atoms.

Explanation:

Molecule: group of two or more atoms held together by chemical bonds. So, minimum 2 atoms are required to form a molecule.

Answer:

[H⁺] = 0.000048936M

pH = 4.31

Explanation:

Acetic acid, CH₃COOH, dissociates in water as follows:

CH₃COOH(aq) ⇄ H⁺(aq) + CH₃COO⁻(aq)

And Ka is defined as:

Ka = 1.76x10⁻⁵ =  [H⁺] [CH₃COO⁻] / [CH₃COOH]

Where [] are equilibrium concentrations of the species.

The 0.000185M of acetic acid will decreases X, and X of [H⁺] and [CH₃COO⁻] will be produced. That means Ka is:

1.76x10⁻⁵ =  [X] [X] / [0.000185 - X]

3.256x10⁻⁹ - 1.76x10⁻⁵X = X²

3.256x10⁻⁹ - 1.76x10⁻⁵X - X² = 0

Solving for X:

X = -0.000066M → False solution. There is no negative concentrations.

X = 0.000048936

As [H⁺] = X,

[H⁺] = 0.000048936M

And pH = -log [H⁺]

Answer:

Amoebas use their pseudopods to ingest food by a method called phagocytosis (Greek: phagein, to eat). The streaming of protoplasm inside the pseudopods moves the amoeba forward.

Explanation:

Answer:

You need 0.702g of ferrous ammonium sulfate hexahydrate to prepare the desired solution.

Explanation:

First, you want to prepare 250.0mL of a 400.0ppm of Fe²⁺ (That is mg/L, w/v):

0.250L * (400mg / L) = 100mg Fe²⁺ = 0.1g Fe²⁺

Molar mass of Fe is 55.845g. moles are:

0.1g Fe²⁺ * (1mol / 55.845g) =

The Fe²⁺ comes from ferrous ammonium sulfate hexahydrate, as 1 mole of this salt contains 1 mole of Fe²⁺, moles of the salt you need are:

1.79x10⁻³ moles Fe(NH₄)₂(SO₄)₂.6H₂O.

To convert these moles to grams you must use molar weight, MW, thus:

1.79x10⁻³ moles Fe(NH₄)₂(SO₄)₂.6H₂O * (392.14g / 1mol) =

Answer:

The correct solution will be "+3".

Explanation:

The given values are:

Number of protons

= 13

Number of neutrons

= 14

Number of electrons

= 10

As we know,

⇒  [tex]Charge = Number \ of \ protons - Number \ of \ electrons[/tex]

On putting the estimated values, we get

⇒               [tex]=13 - 10[/tex]

⇒               [tex]=+3[/tex]

The overall charge on the particle would be +3

The atomic charge on a particle is determined by the number of protons (positive charge) and electrons (negative charge) in the atoms of the particle.

Thus, an atom with 13 protons and 10 electrons will have a residual proton of 3, making the overall charge to be +3.

More on atomic charges can be found here: https://brainly.com/question/2279918?referrer=searchResults

Answer:

It is B. Steel

Explanation:

Answer:

Defenitly B !!

( Steel )

Explanation:

Answer:

The answer is B "circulate and move within a liquid or gas"

Answer:

Xylitol

Please give me the brainliest if you found this helpful

Answer:

it can cause irritation in eyes throat and lungs and u can become lightheaded, or possibly fall in a coma

Answer:

Density = 1.67 g/cm³

New Temperature = 10°C ⇔ 283K

Explanation:

a. Density of a substance can be described as the mass (in grams) of a substance per litre (in mL or cm³) of liquid displaced.

Hence: Density = mass ÷ volume

Density = 25 ÷ 15

Density = 1.67 g/cm³

b. If the object is cooled to half of its original temperature, the new temperature is assumed to be half of the room temperature

Hence, the substance's new temperature will be = 20÷2

=10°C ⇔ 283K (i.e 10 + 273)

Answer:

See attached picture.

Explanation:

Hello,

In this case, considering that Lewis structures are drawn in order to show up the bonding among equal or different atoms via their valence electrons, since hydrogen has one valence electron, silicon four and phosphorous five, the most suitable way to draw and attain the octet for both silicon and phosphorous is by bonding them via a double bond, one hydrogen bonded to the phosphorous and two hydrogen atoms bonded to the silicon as shown on the attached picture, wherein you can count eight electrons for both phosphorous and silicon.

Best regards.

Answer:

D) feedback.

Explanation:

An air condtioning unit consists of the following elements according to available choices:

Inputs: Refrigerant, air from surroundings, electricity.

Process: Refrigeration cycle.

Output: Conditioned air at goal temperature.

Feedback: Activation and deactivation of the air conditioning unit depending on indoor temperature.

When the air conditioning turns on and off to keep goal temperature indoors, a control stage consisting in a controller and a action element is acting to reverse the behavior of the process with a view to keep goal temperature.

Hence, correct answer is D.

Answer:

Four significant figures.

Explanation:

Hello,

In this case, considering that the measurement 16.08 L has four digits we must take into account that all are significant even the zero due to fact that is to the right of the first nonzero digit which is 1, therefore, the measurement has four significant figures.

Best regards.

In order to make water (H2O) out of hydrogen (H2), you also need OXYGEN (O2) gas.  So, first write a correctly balanced equation for this reaction.

2H2(g) + O2(g) ==> 2H2O

Now, convert 59.5 g of H2 to moles, then figure out moles of H2O and then moles of O2 used to do this.  

moles H2 = 59.5 g H2 x 1 mole/2 g = 29.8 moles H2

moles H2O formed = 531 g H2O x 1 mole/18 g = 29.5 moles H2O

So, the mole ratio of H2 to H2O is 1:1 meaning that the moles of O2 used will be 1/2 that amount.  This is the case because from the balanced equation you see that 1 O2 reacts with 2 H2 and produces 2 H2O. 

Amount of O2 used = 29.8/2 = 14.9 moles