I need help with this please

Answer:

cell membrane

Explanation:

it holds everything together

Answer:

A. They cause heat to flow from the system to the surroundings.

Explanation:

Answer:

A. They cause heat to flow from the system to the surroundings.

Explanation:

a p e x , just took the quiz

answer:

it is usually stored in large above-ground tanks or in underground caverns

good luck :)

hopefully, this helps

have a great day !!

**next time you should try goo-gling it, it'll save you the points :)**

Answer:

When the sweat hits the air, the air makes it evaporate (this means it turns from a liquid to a vapor). As the sweat evaporates off your skin, you cool down. Sweat is a great cooling system, but if you're sweating a lot on a hot day or after playing hard you could be losing too much water through your skin.

Explanation:

Hope it is helpful....

Answer: I think it's A. C-A-D-B

Explanation:

John Dalton's theory was publicized in 1803

J.J Thomson's theory was publicized in 1904

Ernest Rutherford's theory was publicized in 1911

And Neil Bohr's was publicized in 1926

Answer:

citric acid = orange

I know the answer for this only..

Answer:

pH= 0.92

Explanation:

HNO3-> H^+ +NO3^-

HNO3 is a strong acid, so it fully dissociates

[HNO3] = 0.12M    [H^+] = 0.12M  

pH= -log[H^+]

pH=-log[.12] = 0.92

pH = 0.92

You come across an article in a scientific journal from 50 different laboratories around the globe that measured the boiling point of water and discovered that it is 100°C everywhere.

Water turns into gas around 212°F (100°C), which is the temperature at which it begins to boil (water vapor). Pressure affects the melting/freezing and boiling points. Water's boiling point changes when air pressure changes. The boiling point decreases with increasing altitude or decreasing pressure.

Water has a freezing point of 32 degrees Fahrenheit and a boiling point of 212 degrees Fahrenheit on the Fahrenheit scale.

To know more about laboratories visit:-

https://brainly.com/question/28233400

#SPJ4

Answer:

Shielding effect is the decrease in the attractive force of the nucleus on tge valence electrons due to inner shell electrons. ... Shielding effect remains same across a period, that is because the number of shells are same for each element in a period. hope this helps!

Answer:

imbibición

Explanation:

La propiedad responsable del fenómeno observado es la imbibición de la puerta de madera maciza.

La imbibición se refiere a una situación en la que las partículas sólidas de una sustancia absorben agua sin formar una solución.

A medida que la puerta de madera absorbe agua, se hincha. Esto es responsable del levantamiento de la puerta. Esta absorción de agua ocurre cuando la temperatura y la humedad relativa son altas. Esto es así porque el aire más cálido retiene más humedad.

Answer:

Please give me Brainliest it would mean a lot

Answer:

The Earth

Explanation:

Answer:

The Earth

Explanation:

Geothermal energy comes from the sub surface of the Earth. It is contained in the rocks and fluids beneath the earth's crust and can be found as far down to the earth's hot molten rock, magma.

Answer:

A

Explanation:

scientists should not be allowed to conduct research that is harmful to others.

Answer:

HCI

Explanation:

Hope this helps. :))))

Answer:

CaCl2 + 2AgNO3 = Ca(NO3)2 + 2AgCl

Explanation:

Calcium chloride react with silver nitrate to produce calcium nitrate and silver(1) chloride

The change that would cause entropy to decrease is CO2 gas changing to solid:

Entropy refers to the degree of randomness of a substance.

The higher the degree of randomness the higher the entropy value of that substance.

Entropy increases with increase in temperature as particles of substances gain more kinetic energy.

However, lowering temperature decreases entropy values.

The change from gas to liquid or solid involves lowering of temperature.

Therefore, the change that would cause entropy to decrease is CO2 gas changing to solid.

Learn more about entropy at: https://brainly.com/question/419265

Answer:

Explanation:

B

Answer:

Being a CEO holds a lot of power and work but, you would need to be able to manage thus power to be able to keep your company running in good hands. work comes in because as a ceo you'll obviously have lots of work but you'll also have employees all of which assist you with managing work

Answer:

It is neither a synthesis reaction nor a decomposition reaction because two reactants form two products.

Explanation:

This reaction would be considered a single replacement reaction.

The chemical reaction involves the products and the reactants. The image is neither synthesis nor decomposition as the two products are formed from two reactants. Thus, option A is correct.

A chemical reaction includes the chemical interaction between the reactants to yield the products. In a synthesis reaction, two reactants interact to produce a different molecule or compound.

In a decomposition reaction, a reactant undergoes splitting to produce products and energy. But in the image two reactants produces two products that neither of the reaction shows.

This type of reaction is seen as the single replacement reaction where the more reactive element displaces the less reactive from the compound to form the new molecule.

Therefore, option a. Maya's picture represents a single replacement reaction but not a synthesis or decomposition reaction.

Learn more about the chemical reactions here:

https://brainly.com/question/16099976

#SPJ2

Answer:

c

Explanation:

Answer:

0.065 moles

Explanation:

Answer: The partial pressure in atm of ammonium telluride is 1.48 atm

Explanation:

According to Raoult's law, the partail pressure of a component at a given temperature is equal to the mole fraction of that component multiplied by the total pressure

[tex]p_A=x\times p_{total}[/tex]  

where, x = mole fraction

[tex]p_A[/tex] = partial pressure of A

[tex]p_{total}[/tex] = total pressure  

[tex]x_{\text {ammonium telluride}}=\frac{\text {moles of ammonium telluride}}{\text {total moles}}[/tex],  

[tex]x_{\text {ammonium telluride}}=\frac{\frac{2.62g}{164g/mol}}{\frac{2.62g}{164g/mol}+\frac{3.83g}{333g/mol}+\frac{1.82g}{673g/mol}}=0.53[/tex]

[tex]p_{\text {ammonium telluride}}=0.53\times 2.795atm=1.481atm[/tex]

Thus the partial pressure in atm of ammonium telluride is 1.48 atm

Answer:

nine orbitals

Explanation:

There are nine orbitals in the n = 3 shell. There is one orbital in the 3s subshell and three orbitals in the 3p subshell. The n = 3 shell, however, also includes 3d orbitals.

Answer:

A map of the galaxy would be a lot bigger and have a lot more names such as planets, stars, etc. While a city would be more basic than a whole galaxy.

Answer:

i dont know

Explanation:

ask your science teacher

Answer:

a. Oxygen

b. 20.39g of Al₂O₃

c. 87%

Explanation:

In order to produce 2moles of Al₂O₃, we need to make react 4 moles of Al, to 3 moles of O₂.

We determine the limiting reactant with the moles of each:

12.98g / 26.98g/mol = 0.481 moles of Al

9.6g / 32g/mol = 0.300 moles of oxygen

4 moles of Al react to 3 moles of O₂

Then, 0.481 mol may react to (0.481 . 3)/4 = 0.361 moles

We only have 0.300 moles of O₂ and we need 0.361. Oxygen is the limiting reactant.

So 3 moles of O₂ can produce 2 moles of Al₂O₃

Our 0.300 moles may produce (0.300 . 2) / 3 = 0.200 mol

Our theoretical yield is: 0.2 mol . 101.96g/ mol = 20.39 g

To determine the percent yield we calculate:

(Produced yield/ Thoeretical yield) . 100 → (17.74 /20.39) . 100 = 87%

Answer:

a. The limiting reactant is Ca(OH)₂

b. The theoretical yield of CaCl₂ is approximately 621.488 grams

c. The percentage yield of CaCl₂ is approximately 47.06%

Explanation:

a. The given chemical reaction is presented as follows;

Ca(OH)₂ + 2HCl → CaCl₂ + 2H₂O

Therefore;

One mole of Ca(OH)₂ reacts with two moles of HCl to produce one mole of CaCl₂ and two moles of water H₂O

The mass of HCl in an experiment, m₁ = 229.70 g

The mass of Ca(OH)₂ in an experiment, m₂ = 207.48 g

The molar mass of HCl, MM₁ = 36.458 g/mol

The molar mass of Ca(OH)₂, MM₂ =74.093 g/mol

The number of moles of HCl, present, n₁ = m₁/MM₁

∴ n₁ = m₁/MM₁ = 229.70 g/(36.458 g/mol) ≈ 6.3 moles

The number of moles of Ca(OH)₂, present, n₂ = m₂/MM₂

∴ n₂ = m₂/MM₂ = 207.48 g/(74.093 g/mol) ≈ 2.8 moles

The number of moles of Ca(OH)₂, present, n₂ = 2.8 moles

According the chemical reaction equation the number of moles of HCl the 2.8 moles of Ca(OH)₂ will react with, = 2.8 × 2 moles = 5.6 moles of HCl

Therefore, there is an excess HCl in the reaction and Ca(OH)₂ is the limiting reactant

b. According the chemical reaction equation the number of moles of CaCl₂ produced in he reaction by the 2.8 moles of Ca(OH)₂ = 2.8 × 2 moles = 5.6 moles of CaCl₂

The molar mass of CaCl₂ = 110.98 g/mol

The mass of the 5.6 moles of CaCl₂ = 5.6 moles × 110.98 g/mol ≈ 621.488 grams

The theoretical yield of CaCl₂ ≈ 621.488 grams

c. Given that the actual mass of CaCl₂ produced = 292.5 grams, we have;

The percentage yield of CaCl₂ = The actual yield/(The theoretical yield) × 100

∴ The percentage yield of CaCl₂ = (292.5 g)/(621.488 g) × 100 ≈ 47.0644646397%

The percentage yield of CaCl₂ ≈ 47.06%.

Answer:

Ca(OH)2 molecular weight. Molar mass of Ca(OH)2 = 74.09268 g/mol. This compound is also known as Calcium Hydroxide. Convert grams Ca(OH)2 to moles or moles Ca(OH)2 to grams. Molecular weight calculation: 40.078 + (15.9994 + 1.00794)*2 ››

Hey,

A) Let's first calculate the molar mass M of the molecule :

M(Ca(OH)₂) = M(Ca) + 2M(O) + 2M(H)

B) Let's deduct the corresponding mass m :

m = M x n

The mass of calcium hydroxide corresponding to this quantity of substance (in mol) is therefore 34 g.