How are you able to see cells?
With contemporary light microscopes.

Answer: B

Explanation: high tides and low tides are usually caused by the moon. The moons gravitational pull generates something called the tidal force. I’m not gonna go deep into this but yeah I think the answer is B

Answer:

:)

Explanation:

Answer:

Explanation:

Dado que:

masa de oxígeno gaseoso = 100 g

presión = 1 atm

temperatura = 273 K

(a)

número de moles de oxígeno contenidos en el matraz = masa de oxígeno / masa molar de oxígeno

= 100 g / 16 gmol⁻¹

= 6.25 moles

(b) El número de moléculas de oxígeno es el siguiente:

Dado que 1 mol de oxígeno gaseoso contiene 6.023 * 10²³ moléculas de oxígeno.

Entonces, 6.25 moles contendrán:

= (6.25 ×  6.023 * 10²³) moléculas de oxígeno.

≅ 3.764 × 10²³ moléculas de oxígeno.

(c) El número de átomos de oxígeno es:

= 2 × 3.764 × 10²³

= 7.528 × 10²³ átomos de oxígeno

(d) Usando la ecuación de gas ideal

PV = nRT

El volumen ocupado por el oxígeno = [tex]\dfrac{nRT}{P}[/tex]

Volumen ocupado por oxígeno = [tex]\dfrac{ 6.25 * 8.314 *273}{1}[/tex]

Volumen ocupado por oxígeno= 14185.76 m³

Answer:

The chemical reaction is a Double Displacement

Explanation:

Balance the reaction of KOH + AlCl3 = KCl + Al(OH)3

Answer:

Halogen elements are dangerous in their uncombined forms because they are very reactive.

Explanation:

Hope this helps you! ^^

Halogens, including such chlorine or bromine, pose an environmental and occupational risk to the lungs and other organs.

The halogens are a group of five or six chemically related elements in the periodic table: fluorine, chlorine, bromine, iodine (I), and astatine.

Tennessee, an artificially created element, may also be a halogen. This group is known as group 17 in modern IUPAC nomenclature.

Halogens are unique in that they have seven valence electrons, making them extremely reactive. Valence electrons are the electrons involved in chemical reactions and are contained in the outer shell.

Fluorine is one of the most reactive elements known to man. Halides are simple halogen-containing compounds. Fluorine gas is lethal. Even breathing air containing 0.1% fluorine can result in death.

Thus, the halogen elements so dangerous in their uncombined forms.

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Answer:

from one metallic element to a different nonmetallic element

Explanation:

For example NaCl is ionic compound in which Na metal donate electron to Cl non metal

Answer:

c

Explanation:

c

Answer:

Rubbing the comb caused static electricity to build up, so it attracted the water.

Well, simply put,

There is no Hydrogen Chloride being produced from this reaction, but instead it's Ammonium Chloride.

Answer:

3.8 L

Explanation:

From Boyle's law;

P1 V1 = P2 V2

P1 = initial pressure = 730 mm Hg

P2 = final pressure = 760 mm Hg

V1= Initial volume = 4.0 L

V2 = final volume = ?

V2 = P1 V1/P2

V2 = 730 × 4/760

V2 = 3.8 L

Answer:

Mass = 72.52 g

Explanation:

Given data:

Mass of hydrogen phosphate produced = ?

Mass of P₂O₅ react = 105.9 g

Solution:

Chemical equation:

P₂O₅ + 3H₂O     →     2H₃PO₄

Number of moles of P₂O₅:

Number of moles = mass/molar mass

Molar mass of P₂O₅ 283.9 g/mol

Number of moles = 105.9 g/ 283.9 g/mol

Number of moles = 0.37 mol

Now we will compare the moles of P₂O₅ with H₃PO₄ from balance chemical equation.

                     P₂O₅        :         H₃PO₄

                         1           :           2

                      0.37        :        2/1×0.37= 0.74 mol

Mass of H₃PO₄ :

Mass = number of moles × molar mass

Mass = 0.74 mol ×  98 g/mol

Mass = 72.52 g

Answer:

See the answer below

Explanation:

When silver is added to dilute sulphuric acid, no reaction would occur. However, silver reacts with hot and concentrated sulphuric acid to produce silver sulphate, sulphur dioxide, and water.

The equation of the reaction is as below:

silver + sulphuric acid --> silver sulphate + water + sulphur dioxide

[tex]2Ag(s) + 2 H_2SO_4(aq) -->Ag_2SO_4 (s) + 2 H_2O (l) + SO_2 (aq)[/tex]

Answer:

Explanation:

When group 7 elements react , their atoms  gains  one  electron into their highest occupied  energy level ( outer shell) to form single negative - charged ion .

As you move down the group , the outer shells get increased  i.e an additional electron shell is added  thereby increasing the atomic radius  of the atom.  The electrons in the outer shell move further away from the nucleus as we go down the group .

Therefore the force of  attraction  between the shells and nucleus is decreased .

This makes attracting an extra electron difficult  . And so ability of the atom to attract electron to fill the outermost shell reduces which means the   reactiveness of the atom reduces.

Answer:N-1

             H-3

             C-1

             H-4

Explanation:Nitrogen-1,Hydrogen-3(Ammonia),Carbon-1,Hydrogen-4(Methane).

Answer:

A. chemical energy

Explanation:

Answer:

32g

Explanation:

I just took the test and got it right

The mass of the copper is approximately 32.5 grams.

To find the mass of the copper, we can use the formula for heat:

Q = m * c * ΔT

where Q is the heat energy, m is the mass, c is the specific heat, and ΔT is the change in temperature.

In this case, we are given:

Q = 950 J (heat energy)

c = 0.39 J/(g·°C) (specific heat)

ΔT = 95.0°C - 20.0°C

= 75.0°C (change in temperature)

Substituting these values into the formula, we can solve for the mass (m):

950 J = m * 0.39 J/(g·°C) * 75.0°C

Dividing both sides of the equation by (0.39 J/(g·°C) * 75.0°C), we get:

m = 950 J / (0.39 J/(g·°C) * 75.0°C)

m ≈ 32.5 g

Therefore, the mass of the copper is approximately 32.5 grams.

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The balanced equation

2NaNO₃ + PbO → Pb(NO₃)₂ + Na₂O

Given

Reaction

NaNO3 + PbO → Pb(NO3)2 + Na2O

Required

Balanced equation

Solution

aNaNO₃ + bPbO → Pb(NO₃)₂ + cNa₂O(Pb(NO₃)₂ ⇒coefficient 1 for the most complex compounds)

N, left=a, right=2⇒a=2

Na, left = a, right=2c⇒a=2c⇒2=2c⇒c=1

Pb, left = b, right=1⇒b=1

The equation becomes :

2NaNO₃ + PbO → Pb(NO₃)₂ + Na₂O

Answer:

[tex]\frac{4}{5}[/tex] moles

Explanation:

The reaction equation is given as:

      4NH₃   +  5O₂  →  4NO  +  6H₂O

The number of moles of O₂ that completely reacted is given as 1 mole

To solve this problem, we are going to use a stoichiometric approach from the balanced reaction equation:

         5 moles of O₂ will react completely to produce 4 moles of NO

        1 mole of O₂ will therefore react to produce  x mole of NO

               5x  = 4

                 x  = [tex]\frac{4}{5}[/tex] moles of NO

Answer: 0.80 mole

Explanation:

Answer:

6

Explanation:

The given reaction is aluminium with hydrochloric acid

2Al + 6HCl → 2AlCl3 + 3H2

the product is aluminium chloride and hydrogen gas.

We can clearly, calculate that there are 2*3=6 chlorine atoms in product side of the reaction.

Answer:

C. 6

Edg2021

Explanation:

Person is right.

Answer:

Mass = 3 g

Explanation:

Given data:

Mass of magnesium = 2.4 g

Mass of oxygen = 2.4 g

Mass of magnesium oxide formed = ?

Solution:

Chemical equation;

2Mg + O₂    →     2MgO

Number of moles of oxygen:

Number of moles = mass / molar mass

Number of moles = 2.4 g/ 32 g/mol

Number of moles = 0.075 mol

Number of moles of magnesium:

Number of moles = mass / molar mass

Number of moles = 2.4 g/ 24 g/mol

Number of moles = 0.1 mol

now we will compare the moles of magnesium oxide with both reactant.

               Mg         :        MgO

                 2          :          2

               0.075    :        0.075

               O₂         :         MgO

                1          :           2

             0.1         :      2/1×0.1 = 0.2

Mass of magnesium oxide:

Mass = number of moles × molar mass

Mass = 0.075 mol × 40 g/mol

Mass = 3 g

Las sustancias a la izquierda de la flecha en una ecuación química se denominan reactivos. Un reactivo es una sustancia que está presente al comienzo de una reacción química. Las sustancias a la derecha de la flecha se denominan productos.

Answer:

divide the moles by gram to get molar mass

use calculator and get yo ans

Answer:

The answer is B. Urine, Feces

Explanation:

Answer:

b.urine ,feces

.................

Answer:

See Explanation

Explanation:

Let us consider the first two reactions, the initial concentration of CO was held constant and the concentration of Hbn was doubled.

2.68 * 10^-3/1.34 * 10^-3 = 6.24 * 10^-4/3.12 * 10^-4

2^1 = 2^1

The rate of reaction is first order with respect to Hbn

Let us consider the third and fourth reactions. The concentration of Hbn is held constant and that of CO was tripled.

1.5 * 10^-3/5 * 10^-4 = 1.872 * 10^-3/6.24 * 10^-4

3^1 = 3^1

The reaction is also first order with respect to CO

b) The overall order of reaction is 1 + 1=2

c) The rate equation is;

Rate = k [CO] [Hbn]

d) 3.12 * 10^-4 = k [5 * 10^-4] [1.34 * 10^-3]

k = 3.12 * 10^-4  /[5 * 10^-4] [1.34 * 10^-3]

k = 3.12 * 10^-4/6.7 * 10^-7

k = 4.7 * 10^2 mmol-1 L s-1

e) The reaction occurs in one step because;

1) The rate law agrees with the experimental data.

2) The sum of the order of reaction of each specie in the rate law gives the overall order of reaction.

Answer:

The desert was one covered by ocean water.

Explanation:

Explanation:

1.39/0.25 * 100% = 5.56%

The number of protons and neutrons in the nucleus​ : 92 and 146

Given

Mass number = 238

Atomic number = 92

Required

Protons and neutrons

Solution

Mass number=number of protons + neutrons

Atomic number=number of protons=number of electrons

Atomic number = 92⇒number of protons=92

Number of neutrons = mass number - atomic number

Number of neutrons = 238 - 92 = 146

Answer:

[tex]P_2=3312torr[/tex]

Explanation:

Hello!

In this case, since here we have a pressure-temperature relationship, we need to use the Gay-Lussac's law in order to compute the final pressure as they are in a directly proportional relationship:

[tex]\frac{P_2}{T_2} =\frac{P_1}{T_1}\\\\P_2= \frac{P_1T_2}{T_1}[/tex]

Now, we plug in the given pressure and temperatures in Kelvins to obtain:

[tex]P_2= \frac{1307torr*(477+273)K}{(23+273)K}\\\\P_2=3312torr[/tex]

Best regards!

Answer:

copper has 2+ ions in a sample of copper

Answer:

Salt has long been used for flavoring and for preserving food. It has also been used in tanning, dyeing and bleaching, and the production of pottery, soap, and chlorine. Today, it is widely used in the chemical industry.