Please answer fast thank you!!!

Answer:

D. Gases were released to the atmosphere

Explanation:

In accordance to the law of conservation of mass, the total amount of reactants must equate the total amount of products at the end of the reaction because matter can not be lost or created. However, certain changes like gas evolution, formation of precipitate etc. indicates the occurrence of a chemical reaction.

In a chemical reaction, the total mass of the product(s) would be less than the total weight of the reactant(s) because GASES, which constituted part of the mass of the reaction, WERE RELEASED INTO THE ATMOSPHERE. However, if the mass of the gas released can be accounted for, the amount of reactants and products must balance.

Cytoplasm: gel like environment which allows organelles to move about the cell

Golgi bodies: packages and ships materials out of the cell

Cell membrane: controls what goes in and out of the cell

Chloroplast: makes food for plant cells using sunlight

Lysosome: breaks down waste, food, and worn out cell parts

Mitochondria: breaks down food to release energy for the cell

Nucleus: contains the cell's DNA and is the control center of the cell

Endoplasmic reticulum: transports materials within cell; process lipids

Vacuole: stores water, waste and food

Ribosome: make proteins

Answer:

I think it would be false

Explanation:

All things have a unique freezing/melting point

Answer:

Why might the expression "1 mole of nitrogen" be confusing? ... WebAssign will check your answer for the correct number of significant ... Calculate the moles of O atoms in 8.18 g of Mg(NO3)2. ... If the molar mass of hemoglobin is 6.8 104 g/mol, how many Fe2+ ions are ... (_) C7H16(l) + 11 O2(g) 7 CO2(g) + 8 H2O(g)

Explanation:

Answer:

1.35g of CaCO₃ are in the paracetamol

Explanation:

Assuming the volume of the 0.5mol NaOH was 23cm³

The CaCO₃ of paracetamol reacts with HCl as follows:

CaCO₃ + 2HCl → CO₂ + H₂O + CaCl₂

When an excess of HCl is added and titrated, we can find the moles of HCl that react = Moles CaCO₃ based on the second reaction:

NaOH + HCl → H₂O + NaCl

Moles added of NaOH:

23cm³ = 0.023L * (0.5mol / L) = 0.0115 moles NaOH = Moles HCl in excess

Moles of HCl:

25cm³ = 0.025L * (1.0mol / L) = 0.025 moles HCl

The moles of HCl that reacted = Moles CaCO₃ are:

0.025 moles - 0.115 moles = 0.0135 moles CaCO₃

The mass of CaCO₃ -Molar mass: 100.09g/mol- is:

0.0135 moles CaCO₃ * (100.09g/mol) =

Answer:

40 L

Explanation:

From the question given above, the following data were obtained:

Initial volume (V₁) = 20 L

Initial temperature (T₁) = T

Final temperature (T₂) = 2T

Pressure (P) = constant

Final volume (V₂) =?

The new (i.e final) volume of the gas can be obtained as follow:

V₁/T₁ = V₂/T₂

20/T = V₂/2T

Cross multiply

T × V₂ = 20 × 2T

T × V₂ = 40T

Divide both side by T

V₂ = 40T /T

V₂ = 40 L

Therefore, the new volume of the gas is 40 L

Answer: (A,B,D) [1, 2, 4]

Explanation:

Answer:

Indeed it is B, you are correct! :3

Explanation:

:3

Answer:

B. Drying paint

Car manufacturers use UV radiation to dry the paint o the vehicle. The high reflectivity of infrared radiation helps to keep the car interior cool. It also gives advantages over convection heating.

Explanation:

Hope it helps

Answer:

Hey mate....

Explanation:

This is ur answer.....

A species considered to be facing a very high risk of extinction in the wild.

Hope it helps you,

Mark me as the brainliest...

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Answer:

It means when a species in the wildlife is in danger or close to being completely extinct.

Answer:

36.2 K

Explanation:

Step 1: Given data

Step 2: Convert T₁ to Kelvin

We will use the following expression.

K = °C +273.15

K = 38 °C +273.15 = 311 K

Step 3: Calculate T₂

We will use Gay Lussac's law.

P₁/T₁ = P₂/T₂

T₂ = P₂ × T₁/P₁

T₂ = 1.0 atm × 311 K/8.6 atm = 36.2 K

Answer:

2 because it has two outer shell electrons out of 8 (relevant rule only for the first 20 elements)

Answer:

1. balanced

2. balanced

3. unbalanced

4. balanced

5. balanced

6. unbalanced

7. balanced

8. unbalanced

Explanation:

Answer:

1. The balanced equation:

Zn + 2HCl —> ZnCl₂ + H₂

The coefficients are: 1, 2, 1, 1

2. 2.34 moles of HCl

Explanation:

1. The balanced equation

__Zn + __HCl —> __ZnCl₂ + __H₂

There are 2 atoms of H on the right side and 1 atom on the left side

It can be balance by writing 2 before HCl as shown below:

Zn + 2HCl —> ZnCl₂ + H₂

Now the equation is balanced.

The coefficients are: 1, 2, 1, 1

2. Determination of the number of mole of HCl that reacted.

NOTE: 1 mole of H₂ = 22.4 L at STP.

Zn + 2HCl —> ZnCl₂ + H₂

From the balanced equation above,

2 moles of HCl reacted to produce 1 mole (i.e 22.4 L) of H₂.

Finally, we shall determine the number of mole of HCl needed to produce 26.22 L of H₂. This can be obtained as follow:

From the balanced equation above,

2 moles of HCl reacted to produce 22.4 L of H₂.

Therefore, Xmol of HCl will react to produce 26.22 L of H₂ i.e

Xmol of HCl = (2 × 26.22)/22.4

Xmol of HCl = 2.34 moles

Thus, 2.34 moles of HCl is needed for the reaction.

Answer:

Explanation:

-Reactants-

C: 1

O: 3

H : 2

-Products-

C: 6

O: 8

H: 12

Since these two are not equal, this reaction is not balanced.

Here is the balanced reaction:

6CO2+6H2O ⇒ C6H12O6+6O2

Answer:

80 tricycle

Explanation:

Because u need 3 wheels to for each tricycle so Ll u have to do is just divide 3 with 240 u will get 80

Water is a polar molecule where,  the positive hydrogen end attracts the negative oxygen ends of another water molecule. Thus, option D is correct.

Polarity is ability of charge separation in a molecule. In some molecules, the positive and negative ends exists separately and both ends remains reactive towards the counter charged end of other molecule.

The charge separation  in molecules results in a  dipole moment. Permanent dipole moment make the molecule polar. Water is a polar molecule.

The shared pair of electrons in water are more attracted towards the electronegative oxygen atom leads the charge separation. This polarity helps to the formation of strong intermolecular hydrogen bonding.

Find more on polar compounds:

https://brainly.com/question/29869649

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Answer:

A

Explanation:

Because in 1 second, line A was faster than line B.

Answer:

Does the picture go with the question?

Explanation:

Answer:

B. are openings in the earth surface

The statement best describes the use of a chemical indicator in a titration is it must change color near the equivalence point.​

A chemical indicator is any substance that shows a chemical change by color or other things.

In titration, phenolphthalein is used as an indicator in the titration of an acid or base.

Other chemical indicators are methyl yellow, litmus paper, and pH indicator.

Thus, the correct option is D. It must change color near the equivalence point.​

Learn more about chemical indicators

https://brainly.com/question/7851989

Answer:

2 moles

Explanation:

For a mole NaCi, we have a mole of sodium ion and a mole of chloride.

Answer:

• The molar amount of the gas

Explanation:

Hello!

In this case, according to the ideal gas law:

[tex]PV=nRT[/tex]

Whereas P stands for pressure, V for volume, n for the molar amount of the gas, R for the universal gas constant and T for the temperature, we can see that as pressure, volume and temperature are given, we can compute the molar amount of the gas as shown below:

[tex]n=\frac{PV}{RT}[/tex]

Since R is a constant always.

Best regards!

Answer:

The reason is that sodium attaches itself very strongly to other elements. Its compounds are very difficult to break apartand also because it is so reactive.

Answer:

SATURATED: Saturated fat is a type of fat in which the fatty acid chains have all or predominantly single bonds.

UNSATURATED: Unsaturated fats are loosely packed. They tend to be liquid at room temperature.

There are two main types of unsaturated fat:

Monounsaturated

Polyunsaturated

Answer:

D, F

Explanation:

Answer:

the solubility of the gas increases

Explanation:

as the kinetic energy of a gaseous solute increases,its molecules has a greater chance of escaping the attraction of the solvent molecules and return to the gas phase..which lead to the solubility of the gas been Increase as the temperature decreased .

Water and oil? Cake and your finger? Glass and virtually anything? ...

Tonnes and tonnes of noninterreactant substances.

Hope this helps.