please help question is in photo will give brainiest

Answer:

Explanation:

An atom is the smallest unit of an element that can take part in a chemical reaction. Atoms (and there corresponding symbols) mentioned in the question are

Lithium ⇒ Li

Carbon ⇒ C

Nitrogen ⇒ N

Potassium ⇒ K

Oxygen ⇒ O

Iron ⇒ Fe

Chlorine ⇒ Cl

A compound is substance that contains two or more atoms that are chemically combined and can be represented with a chemical formula. The compounds (and there corresponding formula) mentioned in the question are

Water ⇒ H₂O

Edible salt (sodium chloride) ⇒ NaCl

Chalk (calcium carbonate) ⇒ CaCO₃

Lime (calcium oxide) ⇒ CaO

Iodides (such as sodium iodide and potassium iodide) ⇒ NaI and KI respectively

Answer:

b. This is a redox reaction in which octane (C8H18) is the reducing agent.

Explanation:

edge 2021 i just did it

The statement which best describes the reaction is:

This is not a redox reaction. It is an example of combustion.

This is a reaction which is accompanied by a change in the oxidation number of the reacting elements

This is a reaction in which a substance burns in air (oxygen) to produce carbon dioxide, CO₂ and water, H₂O

Considering the equation given

2C₈H₁₈ + 25O₂ —> 16CO₂ +18H₂O

we can see that C₈H₁₈ burns in air (oxygen) to produce carbon dioxide, CO₂ and water, H₂O

Thus, we can conclude that the reaction is not redox but an example of combustion reaction

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Answer:

V₂  = 495.89 mL

Explanation:

Given data:

Initial number of moles = 0.213 mol

Initial volume = 652 mL

Final number of moles = 0.162 mol

Final volume = ?

Solution:

V₁/n₁    =    V₂/n₂

By putting values,

652 mL/0.213 mol   =  V₂ /0.162 mol

V₂  = 652 mL 0.162 mol /0.213 mol

V₂  = 105.62 mL.mol /0.213 mol

V₂  = 495.89 mL

Answer:

Calcium

2.8.8.2

last energy she'll got 2 electrons

as 2 valency

Answer:

134K

Explanation:

Using the ideal gas law equation;

PV = nRT

Where;

P = pressure (atm)

V = volume (Litres)

n = number of moles (mol)

R = gas constant (0.0821 Latm/Kmol)

T = temperature (K)

Based on the information provided, n = 1.4moles, P = 3.25atm, V = 4.738L, T = ?

3.25 × 4.738 = 1.4 × 0.0821 × T

15.3985 = 0.11494T

T = 15.3985/0.11494

T = 133.969

Approximately;

T = 134K

Answer:

C. CO

Explanation:

A molecule is a substance that is a combination of two or more atoms through a chemical bond while an element is a substance containing only one type of atom. However, some elements are also considered molecules because of having diatoms such as: Hydrogen, Oxygen, Chlorine, Bromine, Fluorine, Nitrogen and Iodine.

Among the choices above, it is only choice C (Carbon monoxide) that is a molecule. All the other options (Calcium, Cobalt and Copper) are elements. Carbon monoxide is a combination of one atom of carbon and another atom of oxygen.

The option that represents a molecule would be CO. That is option C.

A molecule is defined as the substance that is made up of two or more elements that are chemically combined together.

From the options give above, CO which is carbon monoxide is diatomic. This shows that it contains two elements making it a molecule.

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Answer:

adding water would make the solution less concentrated. Hope this helps :)

Explanation:

The solution would become less concentrated if water was added.

A solution is just a uniformly dispersed mixture with one or maybe more solutes in a solvent. solvent.

What is concentrated?

The number of particles existing in a combination is expressed by the concentration of such a chemical substance.

When suitably diluted, this solution will have to be efficient at killing microorganisms. How or when to Sanitize using bleach in a safe way.

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Answer:

1: C

2: a

3: B

4: D

hope this helps

Answer:

the bigger the size the more easier to see from a distance and the smaller the harder to see.

Explanation:

Explanation:

In methane the intermolecular forces are the weak London dispersion forces. Water molecules are held together by hydrogen bonding.

Hydrogen bonds holds water molecules together. Since it is a stronger bond, it confers a higher boiling point

Answer:

125 pounds = 56.6990463 kilograms

Explanation:

Answer:

Sigma Bonds = 14

Pi bonds = 0

Explanation:

Butanol:

[tex]\sf CH_{3} -CH_{2}-CH_{2}-CH_{2}-OH[/tex]

There is no pi bond in this compound (since there is no double or triply bond)

So,

Pi bond = 0

Now, Coming towards sigma bonds

Sigma bonds = 3 (First carbon with hydrogen) + 2 (Second C with H) + 2 (Third C with H) + 2 (Fourth C with H) + 1 (Bond of O and H) + 4 (Bonds between C and C and C and O)

Sigma Bonds = 14

[tex]\rule[225]{225}{2}[/tex]

Hope this helped!

Answer:

Explanation:

Convection currents generated within the asthenosphere push magma upward through volcanic vents and spreading centres to create new crust.

Answer:

B. subduction

Answer:

the contenental crust was b gone beacause of water that fill in the land also the volcano in the under of water will increase

Answer:

D

C

Explanation:

Answer:

it is because a number of factors, including sample surface cleanliness and temperature, can prevent chunks of alkali metals from exploding on contact with water. The team eliminated those variables and others by using a sodium-potassium alloy that remains liquid at room temperature and a droplet delivery system featuring a calibrated syringe.

Answer: Potassium has a chloride mixture which makes it so sodium interacts easily with it to form the bond

Answer:

Explanation:

The mass of the car can be found by using the formula

[tex]m = \frac{f}{a} \\ [/tex]

f is the force

a is the acceleration

From the question we have

[tex]m = \frac{2000}{2.5} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

55

Explanation:

mass number=protons+neutrons

=25+30

=55

Answer:

B. The air pressure would increase 2X

Explanation:

Pressure = density × acceleration due to gravity × height

p = ρ × g × h

Pressure is force per unit area

p = F/a

Density is mass per unit volume

Pressure is directly proportional to density hence, any change in the density of a body directly affects the change in pressure of the body and vice versa.

Answer:

A.hydrogen

Explanation:

A normal hydrogen (H) atom does not have any neutrons in its tiny nucleus

Answer:

The constant can be calculated using the ratio of products to reactants when the equation has reached equilibrium. The equilibrium constant is often represented by the variable Keq, which is defined by the equilibrium constant expression

Explanation:

i am sry to lazy to write it

A) CaCl2

Calcium chloride is an inorganic compound, a salt with the chemical formula CaCl2. It is a colorless crystalline solid at room temperature, highly soluble in water.

Answer:

The Answer Is C

Answer:

Se requerirán 14.57 gramos de MgSO₄·7H₂O, que se disolverían en 105.43 gramos de agua.

Explanation:

Si tenemos 120 gramos de una solución al 10% de sulfato de magnesio en peso, habrán en la solución (120*10/100) 12 gramos de sulfato de magnesio (MgSO₄).

Sin embargo, el reactivo que está disponible es heptahidratado (MgSO₄·7H₂O), por lo que hay que calcular cuántos gramos de sulfato de magnesio heptahidratado contendrán 12 gramos de MgSO₄.

Calculamos las moles de 12 gramos de MgSO₄, usando su masa molecular:

Después calculamos la masa de MgSO₄·7H₂O que contendrá 0.0997 mol MgSO₄, usando la masa molecular de MgSO₄·7H₂O:

Para saber la cantidad de agua en la que se disolverá el reactivo, restamos la masa de soluto de la masa total de la solución:

Answer:

58.3 cm

Explanation:

took the quiz.

Answer:

Its a

Explanation:

i took the quiz

The sentence that is inappropriate in an informational piece of writing with a formal tone is "People find Shakespeare's Pericles, Prince of Tyre boring and annoying because it's possible that he didn't even write the entire play." The correct option is A.

In academic or professional settings, a formal writing tone is common. This tone emphasizes thoroughness and directness while remaining respectful.

It emphasizes facts and grammatical correctness and uses full words rather than contractions.

The use of standard English, more complex sentence structures, the infrequent use of personal pronouns, and the absence of colloquial or slang terms characterize formal language.

In informal language, nonstandard English forms, colloquial vocabulary, and typically shorter sentence structures are permitted.

"People find Shakespeare's Pericles, Prince of Tyre boring and annoying because it's possible that he didn't even write the entire play," is an inappropriate sentence in a formal informational piece of writing.

Thus, the correct option is A.

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Answer:

Either the first one or the third one.

Explanation:

Using process of elimination: knowing that the controlled variable is something the conductor is able to control and stays the same throughout; the amount of water is the same, but it also states that temperature is not the same throughout. This cancels out B because the amount of sugar dissolved varies and doesn’t stay the same. D fits the same criteria as well.

so now we are left with A and C.

An independent variable is something that can be by itself and doesn’t depend on anything else. Sugar is NOT independent, as it dissolves DEPENDING on the amount of liquid. So we can already rule out that sugar is a dependent variable. Both A and C have those choices though, so now we are with the control group and the independent variable.

Think about it, which is the independent variable? Water amount doesn’t depend on anything, while the temperature depends on the room. So the answer is most likely A.

Hope this helps, don’t stress about homework. Happy Holidays!