plz help fast lot of points.

Answer:22.4 L methane reacts with 44.8 L of oxygen to give 22.4 L of CO  

2  and 44.8 L of water.

Explanation:

Answer:

In molecules, there is a pattern to the number of covalent bonds that different atoms can form. Each block with a number indicates the number of covalent bonds formed by that atom in neutral compound

Explanation:

I don't really know the answer sorry

Answer:

I believe the answer is II and III

Explanation:

I'm not sure if III is right cause I cannot read the last word but I think it's OK.

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Answer:

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

Explanation:

Six chemical elements in Group 1, the leftmost column in the periodic table.

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Answer:

Ethyne is a colourless gas with a characteristic smell. It has a melting point -81oC. It has a boiling point -84oC.

Explanation:

B

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Answer: Although metamorphic rocks typically form deep in the planet's crust, they are often exposed on the surface of the Earth.

Explanation:

Answer:

I would go with the first option. It shows how people having been releasing more and more carbon dioxide into the atmosphere.

Explanation:

Non-metals will never replace metals or vice versa, they'll only replace itself or the only type of reaction that it is or element that it is.

Answer:

Here

Explanation:

Chemists need the mole concept to bridge the gap between the microscopic world of atoms to the macroscopic world of humans. As you know, the molecular level consists of particles that are invisible to us.

Answer:

it allows us to count atoms and molecules by weighing macroscopic amounts of material.

C)

Only valence electrons are involved in forming chemical bonds betwen two atoms.

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Answer:

Prokaryotic / Eukaryotic

Answer:

I don't know

Explanation:

pls I need a little bit answer

Answer: D. Potassium

Explanation:

A. Salad- a mixture of vegetables or fruits❌

B. Sugar- a compound made up of many elemnts❌

C. Water-  a molecule made up of two elements (water and hydrogen)❌

D. Potassium- the only pure element of the options provided.✅

Answer:

D, potassium

Explanation: took test ! btw

Answer:

The required mass to prepare 2.5 L of 1.0 M NaOH solution is 100 g

Explanation:

We do this by preparing the equation:

Mass = concentration (mol/L) x volume (L) x Molar mass

Mass = 1.0 M x 2.5 L x 40 g/mol

Mass = 100 g

Answer:

[tex]100\; \rm g[/tex] of [tex]{\rm NaOH}\; (s)[/tex] would be required.

Explanation:

The quantity of solute in a solution of concentration [tex]c[/tex] and volume [tex]V[/tex] would be [tex]n = c \cdot V[/tex].

It is given that volume [tex]V = 2.5\; \rm L[/tex] for the solution in this question. It is also given that the concentration of the [tex]\rm NaOH[/tex] solute in this solution is [tex]c = 1.0\; \rm M[/tex], which is the equivalent to [tex]c = 1.0\; \rm mol \cdot L^{-1}[/tex].  

Apply the equation [tex]n = c \cdot V[/tex] to find the quantity of [tex]\rm NaOH[/tex] in this solution:

[tex]\begin{aligned}n &= c \cdot V \\ &= 1.0\; \rm mol \cdot L^{-1} \times 2.5\; \rm L \\ &= 2.5\; \rm mol\end{aligned}[/tex].

Multiply the quantity [tex]n[/tex] of [tex]\rm NaOH[/tex] in this solution with the formula mass [tex]M[/tex] of [tex]{\rm NaOH}\![/tex] to find the corresponding mass:

[tex]\begin{aligned}m &= n \cdot M \\ &= 2.5\; \rm mol \times 40\; \rm g \cdot mol^{-1} \\ &= 100\; \rm g\end{aligned}[/tex].

Thus, this solution would contain [tex]100\; \rm g[/tex] of [tex]{\rm NaOH}[/tex].

It would thus take [tex]100\; \rm g[/tex] of [tex]{\rm NaOH}[/tex] to prepare this solution.

Answer:

water is called solvent

Answer:

Option d (solvent)

Explanation:

In salt solution, salt is the solute. A solvent is the substance that does the dissolving – it dissolves the solute. In salt solution, water is the solvent

Answer:

You should never throw water on an electrical fire because water conducts electricity and you could be electrocuted.

Please mark 4 brainliests

Answer:

True

Explanation:

As the number of protons in the nucleus increases, the number of neutrons needed for a stable nucleus increases even more rapidly.

The most likely ion of Phosphorous is P³⁻ (group 15) since gaining three electrons is the most energetically favorable way for it to follow the octet rule.

Because the charge on ions is equivalent to their oxidation state, then -3 is the most likely oxidation number of Phosphorous.

Random errors will shift each measurement from its true value by a random amount and in a random direction. These will affect reliability (since they're random) but may not affect the overall accuracy of a result.

Answer:

a and b

Explanation:

Answer:

The after-rain smell is produced by an interaction between rain and the oils released by plants. Due to chemical reaction between the rain water and oils secreted out by the plants

A homemade volcano can be created by combining baking soda and vinegar. When it erupts, carbon dioxide gas is released. When vinegar reacts with baking soda  carbon-dioxide gas is released.

The Statue of Liberty has turned green over time due to the reaction of copper with ,oxygen,carbon dioxide and water.

Explanation:

Chemical change is defined as those change in which arrangement of atoms present in the substance changes and leads to formation of new substance.

The after-rain smell is produced by an interaction between rain and the oils released by plants. Due to chemical reaction between the rain water and oils secreted out by the plants

A homemade volcano can be created by combining baking soda and vinegar. When it erupts, carbon dioxide gas is released. When vinegar reacts with baking soda  carbon-dioxide gas is released.

[tex]CH_{3} COOH+ NaHCO_3[/tex]→[tex]CO_2+H_2O+CH_3COONa[/tex]

The Statue of Liberty has turned green over time due to the reaction of copper with ,oxygen,carbon dioxide and water.

[tex]Cu+O_2+CO_2+H_2O[/tex]→[tex]Cu_2(OH)_2CO_3[/tex]

Physical change is defined as those changes which leads to change in shape, size or state of the substance changes. No new substance is formed.

Planets form from particles in a disk of gas and dust, colliding and sticking together as they orbit the star. The planets nearest to the star tend to be rockier because the star's wind blows away their gases and because they are made of heavier materials attracted by the star's gravity.

Answer:

the answer is A for this question

Answer:

b is right answer because xylem provide nutrition and water to the plant

gardens arent real the government is lying the world is a simulation

As the soil absorbs manure, nutrients are released. This enriches the soil, which in turn helps the plants. The most important benefit of using manure in the garden is its ability to condition the soil For instance, mixing manure with sandy soils helps to retain moisture levels.

Answer:

Refer to the attachment

Answer:

Oxidation and Reduction occurs

Explanation:

Answer:

Here

Explanation:

When the atom absorbs energy, it can move to a higher energy state, or excited state. Under what circumstances can an atom emit a photon? A photon is emitted when an atom moves from an excited state to its ground state or to a lower-energy excited state.