The cell membrane is found in all cells *

True
False

Answer:

Period 4, group 5- Vanadium

Period 5, group 7- Technetium

Period 7, group 5- Dubnium

Period 5, group 4- Zirconium

Explanation:

Explanation:

1 metal they are likely to lose an electron

2non metals

3 Nobel gases because they are not reactive with stable valance number

Answer:

carbon dioxide CO[tex]{2}[/tex]

Explanation:

Double Polar Covalent bonds with CO2

Explanation:

Keep in mind that CO2 is a nonpolar molecule

Answer:

La fórmula empírica y molecular es: C₂H₆O.

Explanation:

Para calcular la formula empírica y molecular del compuesto debemos primero plantear la reacción:  

[tex] C_{x}H_{y}O_{z} + O_{2} \rightarrow CO_{2} + H_{2}O [/tex]

Necesitamos encontrar "x", "y" y "z". Para ello, tenemos que recordar que la masa de carbono e hidrógeno producida está relacionada con la cantidad de C y H inicial (del compuesto):

Para el H:

CHO → H₂O

y          5,4g

[tex] \frac{2*1 g}{18 g} = \frac{y}{5,4 g} \rightarrow y = 0,6 g [/tex]

Para C:  

CHO → CO₂

 x         8,8g

[tex] \frac{12 g}{44 g} = \frac{x}{8,8 g} \rightarrow x = 2,4 g [/tex]

Para el O:

[tex] z = 4,6 g - 2,4 g - 0,6 g = 1,6 g [/tex]

Ahora mediante el calculo de los moles del C, H y O podemos encontrar la fórmula empírica:

Para el H:

[tex] n_{y} = \frac{m}{Pm} = \frac{0,6 g}{1 g/mol} = 0,6 moles [/tex]

Para el C:

[tex] n_{x} = \frac{m}{Pm} = \frac{2,4 g}{12 g/mol} = 0,2 moles [/tex]

Para el O:

[tex] n_{z} = \frac{m}{Pm} = \frac{1,6 g}{16 g/mol} = 0,1 moles [/tex]

[tex] C_{\frac{n_{x}}{n_{z}}}H_{\frac{n_{y}}{n_{z}}}O_{\frac{n_{z}}{n_{z}}} = C_{\frac{0,2}{0,1}}H_{\frac{0,6}{0,1}}O_{\frac{0,1}{0,1}} = C_{2}H_{6}O_{1} [/tex]

Entonces, la fórmula empírica del commpuesto formado es C₂H₆O.

Ahora para determinar la fórmula molecular podemos usar la siguiente relación:

[tex] \frac{Pm}{Pm_{e}} = n [/tex]

[tex] F_{m} = n*F_{e} [/tex]

[tex] F_{m} = \frac{Pm}{Pm_{e}}*F_{e} [/tex]    

En donde Fm (fórmula molecular) y Fe (fórmula empírica) están relacionadas por n.

El valor de Pm lo obtenemos de la ecuación del gas ideal:

[tex]PV = nRT = \frac{m}{Pm}RT[/tex]

[tex] Pm = \frac{mRT}{PV} = \frac{9,2 g*0,082 L*atm/(K*mol)*(90 + 273 K)}{1.02 atm*5,80 L} = 46,3 g/mol [/tex]

[tex] F_{m} = \frac{46,3 g/mol}{(2*12 + 6*1 + 16)g/mol}*C_{2}H_{6}O_{1} = 1.00*C_{2}H_{6}O_{1} = C_{2}H_{6}O_{1} [/tex]    

Por lo tanto, la fórmula molecular es la misma que la fórmula empírica, a saber C₂H₆O.

Espero que te sea de utilidad!

Answer:

C: amount of mass in a certain volume

Explanation:

Just took the quiz and got 100%

Ayour anwerser

Explanation

Answer:

chlorine manoxside

co2

Explanation:

you should

MOL × NA(Avogadro Constant)

Mol = 4

HNO3 = 5 Atome ( 1H + 1N + 3O)

NA = 6.02 × 10* ( * = 23)

[tex]4 \times 5 \times 6.02 \times {10}^{23} = 20 \times 6.02 \times {10}^{23} = 120.4 \times {10}^{23}atom [/tex]

Answer:

2.408 x 10^24

GREETINGS!

One mole of a substance is equal to 6.02 × 10²³ units of that substance. The number 6.022 × 10²³ is known as Avogadro's number.

so if one mole of molecule is equal to that number so,

                              for 4 moles of [tex]HNO_{3}[/tex]= 4 x ([tex]6.02x10^{23}[/tex])

so answer is,

                      2.408 x 10^24

HOPE IT HELPS YOU.

Answer:

B. How many of each atom are present in the compound

D. the simplified ratio of atoms in relation to each other

Explanation:

In a chemical formula, chemical elements or atoms are represented by a chemical symbol for example Fe for iron and Na for sodium, and the number of each atom is represented by a subscript such as CO2, where 2 is a subscript representing 2 atoms of oxygen.

A subscript represents the number of each atom in the compound and the simplified ratio of atoms in relation to each other. The simplified ratio of atoms in relation to each other means subscript shows the contribution of both the atoms in the compound, for example: N2 + 3H2 => 2NH3, it means the subscript showing the ratio or proportionate of atoms that is 2:2 for both nitrogen and hydrogen.

The subscript is always written below and to the right of the chemical symbol.

Hence, the correct answer is "B. How many of each atom are present in the compound and D. the simplified ratio of atoms in relation to each other"

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\ [/tex]

From the question

mass = 102 g

volume = 24.5 mL

We have

[tex]density = \frac{102}{24.5} \\ = 4.163265306...[/tex]

We have the final answer as

Hope this helps you

Answer:

Explanation: The correct answer is 1. Do not put 2 .

Answer:

B - BF3

Explanation:

BF3 has 3 bonds around the central atom and now lone pairs on it. This matches the geometry of a trigonal planar molecule as per the VSEPR Model.

Molecules have two distinct characteristics: form and geometry. Geometry includes the lone pair encircling the focal element whereas shape excludes it. Therefore, the correct option is option B.

Valence shell electron repulsive force is what VSEPR stands for. Based on the valence electron pairs that are prevalent around the core element of the molecule, the VSEPR theory is employed to predict the structure and geometry of molecules.

According to VSEPR theory, Lone pair lone pair repulsion is greater than bond pair bond pair repulsion. The core atom of BF[tex]_3[/tex] is surrounded by three bonds and contains no lone pairs. According to the VSEPR Model, this corresponds to the geometry of such a trigonal planar molecule.

Therefore, the correct option is option B.

To know more about VSEPR theory, here:

https://brainly.com/question/19582124

#SPJ6

Answer:

water vapour is there

Explanation:

thats all i know

3Zn + 8HNO₃⇒ 3Zn(NO₃)₂ + 2NO + 4H₂O

Equalization of chemical reaction equations can be done using variables. Steps in equalizing the reaction equation:  

For gas combustion reaction which is a reaction of hydrocarbons with oxygen produces CO₂ and H₂O (water vapor). can use steps:  

Balancing C atoms, H and the last O atoms

Reaction

Zn + HNO₃⇒ Zn(NO₃)₂ + NO + H₂O

aZn + bHNO₃⇒ Zn(NO₃)₂ + cNO + dH₂O

Zn : left = a, right =1 ⇒a=1

H : left = b, right = 2d⇒ b=2d (eq 1)

N : left = b, right = 2+c⇒b=2+c (eq 2)

O : left = 3b, right = 6+c+d ⇒3b=6+c+d(eq 3)

3(2d)=6+c+d

6d=6+c+d

5d=6+c (eq 4)

3(2+c)=6+c+d

6+3c=6+c+d

2c=d (eq 5)

5(2c)=6+c

10c=6+c

9c=6

c = 2/3

d = 2 x 2/3

d = 4/3

b = 2 x 4/3

b = 8/3

The equation

aZn + bHNO₃⇒ Zn(NO₃)₂ + cNO + dH₂O to

Zn + 8/3HNO₃⇒ Zn(NO₃)₂ + 2/3NO + 4/3H₂O x 3

3Zn + 8HNO₃⇒ 3Zn(NO₃)₂ + 2NO + 4H₂O

Answer:

So I don't know what do you mean by that, please be a little specific.

Explanation:

^^

Answer:

[tex]\boxed {\tt Kinetic \ energy}[/tex]

Explanation:

First, let's define kinetic energy and potential energy.

Kinetic

Potential

Since the boy is walking down the street, the boy is in motion. Therefore, the energy must be kinetic energy.

Answer:

Nitrogen

Explanation:

The element nitrogen cannot be a product in the given reaction.

  The reaction is;

    HCl  + CaCO₃

According to the law of conservation of matter, "matter is neither created nor destroyed in the cause of a chemical reaction".

The law suggests that, in a chemical reaction, we end up with the same species we started with. Although due to rearrangement of bonds,  new compounds can form;

Starting atoms

     H

     Cl

     Ca

      O

These species will also be found in the product.

Answer:

i think it is letter b. rustability but not so sureeee

Answer:

it is 75 degrees

Explanation:

Volume is 138.7 mL.

The equation for calculation of volume is as follows:-

[tex]\frac{P_1V_1}{T_1} =\frac{P_2V_2}{T_2}[/tex]

STP:-

Temperature=273 K

Pressure=1 atm

[tex]\frac{1 atm\times250mL}{273 K} =\frac{2 atm\times V_2}{303\ K}\\V_2=138.7\ mL[/tex]

Hence, the volume is 138.7 mL.

To know more about:-

https://brainly.com/question/15988929

Answer:

Where is the phase melting graph? Can't seem to find it

Answer:

there would be no effect

Explanation:

Answer:

101

Explanation:

Answer:

Explanation:

Answer:

1875 nm

Explanation:

Given the Rydberg formula for hydrogen: 1/λ = R(1/n₁² - 1/n₂²)

where R ≈ 1.097* 10^7 /m

Hence;

1/λ = 1.097* 107/m * (1/3² - 1/4²) = 5.3 * 10^5/m

λ = 1.875 * 10-6 m = 1875 nm

Answer:

Rocks

Explanation:

The combined aggregation of minerals​  are called rocks. There are three types of rocks Igneous Rocks, sedimentary rock, and metamorphic rocks.

Rocks are formed due to the repetitive, orderly, geometrical internal arrangement of minerals. Minerals undergo several processes such as weathering, crystallization, erosion, and sedimentation to form rocks.

Hence, the combined aggregation of minerals​  is called rocks.