Help me plzz it’s for

Answer:

2 Na2O means two molecules of Sodium oxide.

mark me please

Answer:c

Explanation: A molecule is two atoms bonded together

Answer:

5.625 moles of oxygen, O₂.

Explanation:

The balanced equation for the reaction is given below:

4Al + 3O₂ —> 2Al₂O₃

From the balanced equation above,

4 moles of Al reacted with 3 moles of O₂.

Finally, we shall determine the number of mole of O₂ required to react with 7.5 moles of aluminum, Al. This can be obtained as illustrated below:

From the balanced equation above,

4 moles of Al reacted with 3 moles of O₂.

Therefore, 7.5 moles of Al will react with = (7.5 × 3)/4 = 5.625 moles of O₂.

Thus, 5.625 moles of O₂ is needed for the reaction.

Answer:

solution is a homogeneous mixture of two or more component

Answer:

B) heterogeneous mixture

Explanation:

Answer:

4

Explanation:

total electrons = 6

electronic configuration = 1s^2, 2s^2, 2p^6

so in s orbital there are 4 electrons.

Hope it helps you (｡◕‿◕｡)

Answer:

5) donating H to a solution when they have been depleted and accepting H when they are in excess.

Explanation:

A buffer solution is a solution that undergoes a negligible change in pH in addition of moderate quantities of acid or alkali. In other words, a buffer solution is one that resists a change in pH on addition or dilution of small amounts of acids or alkalis.

So, from the given question:

Buffers are substances that help resist shifts in pH by donating H to a solution when they have been depleted and accepting H when they are in excess.

Answer:

Isotopes, protons, netrons

Explanation:

Answer:

There are three known forms of hydrogen. These forms are called Isotopes of each other. Each of these forms will have the same number of protons but different numbers of neutrons  in their nuclei.

Explanation:

Answer:

12.33

Explanation:

92.5/7.5= 12.33

30g of the sterling silver ring contains, 27.75 g of silver and 2.25 g of copper.

Cross multiply fractions by multiplying one fraction's denominator by the other fraction's numerator and then comparing the two values. The larger fraction is the one with the higher value.

Therefore,

( cross multiplication),

100 × X = 92.5 × 30

X = 92.5 × 30/ 100

100g sterling silver = 7.5g copper

30g sterling silver= Y g copper

(cross multiply)

100 × Y =  7.5 × 30

Y= 7.5 × 30 / 100

therefore, 30g of sterling silver ring contains, 27.75 g of silver and 2.25 g of copper.

To learn motre about cross multiplication, refer to:

https://brainly.com/question/28839233

#SPJ2

Answer:

60 g

Explanation:

Mass = Density × Volume

Mass = 1.25 × 48

Mass = 60 g

I hope this helps!

Answer:

[tex]n_{KClO_3}=0.0353molKClO_3[/tex]

Explanation:

Hello!

In this case, according to the experiment, we first realize that the pressure of oxygen is:

[tex]p_{O_2}=1.00atm-26.0/760 atm=0.966atm[/tex]

Next, we compute the moles based off the ideal gas law:

[tex]PV=nRT\\\\n=\frac{PV}{RT}=\frac{0.966atm*1.35L}{0.08206\frac{atm*L}{mol*K}*300K}=0.0530molO_2[/tex]

Thus, since there is 3:2 mole ratio between oxygen and potassium chlorate, we can compute the consumed moles of the latter as shown below:

[tex]n_{KClO_3}=0.0530molO_2*\frac{2molKClO_3}{3molO_2} \\\\n_{KClO_3}=0.0353molKClO_3[/tex]

Best regards!

Answer:

jjsydydbbeyxgxhx

Explanation:

nnhejjej

Answer:

B

Explanation:

just answered

An artificial reef is intended to affect the ocean ecosystem by providing shelter and habitat for marine organisms causing sediment to erode into deeper waters. Hence, option C is correct.

An artificial reef is a human-made underwater structure, typically constructed with the purpose of enhancing marine biodiversity, providing habitat for marine organisms, and promoting recreational activities like fishing, diving, and snorkeling.

Artificial reefs can be created from a variety of materials, such as concrete, metal, tires, and sunken ships. The reef structure can also increase the overall biodiversity of an area by creating a new habitat for species that may not have been present before.

Additionally, the presence of an artificial reef can help to reduce pressure on natural reefs by providing an alternative location for fishing and other activities. However, artificial reefs are not typically used as a means of removing pollution from the water or preventing erosion.

Therefore, option C is correct.

Find more on artificial reef:

https://brainly.com/question/17238115

#SPJ2

Answer:

Explanation:

Purpose of Case Control Studies

To determine whether or not an association exists between a disease and a particular risk factor. To start with a group of people with disease and work back to see whether a possible risk factor may be the cause. It may be the first step in testing a hypothesis.

Answer:

Potassium (K) is of atomic number 19 and has only 1 electron in the outermost shell

And this is because of the octet rule of chemistry followed while determining the number of electrons in each shell.

According to the octet rule, there can only be a maximum of 8 electrons in the outer shell of an atom, So when 'L' shell of K is filled with 8 electrons to accommodate the 19th electron a new shell will be created

Answer:

D

Explanation:

Answer:

i guess

Explanation:

we will never know

Answer:

https://quizizz.com/admin/quiz/5902a3fd8d05b2100088880a/cat-1-chemistry-review

Explanation:

Answer:

atomic? hope this helps!

Explanation:

Answer:

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

Answer:

help me with this

Explanation:

Answer:

the tea was not hot sugar dissolves quickly and hot water than cold

Answer:

LOL

Explanation:

Answer:

1. solid

2. liquid

3. plasma

4. gas

Those are the four parts of matter.

Explanation:

I hope this helps.

Answer:

Explanation:

From the given information;

Let Q(t) = mass of dye in the tank as a function of time

The mass in the tank = 200 L × (1g/L) = 200 g

Using the law of mass conservation;

[tex]\dfrac{dQ}{dt} = \text{(Rate of incoming mass)- (rate of outgoing mass)}[/tex]

[tex]\dfrac{dQ}{dt} = (2 L/min ) (0 \ g/L) - (2 L/min ) (\dfrac{Q}{200}g/L)[/tex]

[tex]Q' = \dfrac{-Q}{1000}[/tex]

Q(0) = 200

By finding the solution to the ODE using the method of separation of variables;

[tex]\dfrac{Q'}{Q} = -0.01[/tex]

[tex]Q(t) = Ce^{-0.01t}[/tex]

Using the initial condition;

200 = Q(0) = C

[tex]Q(t) = 200e^{-0.01t}[/tex]

1% of 200g = 2g of dye solution

∴

[tex]2 = 200e^{-0.01t}[/tex]

[tex]e^{-0.01t}=0.01[/tex]

[tex]t =\dfrac{ In(0.01}{-0.01}[/tex]

t = 460.5 hours

Answer:

Filtration

Explanation:

Filtration is a physical separation technique that is used to separate solids from liquids or gases. The process involves the use of a filter which allows just the liquid to pass through.

In this case, the coffee beans is the solid and the boiling water is the liquid. The special piece of paper is the medium (filter) through which the coffee is collected.

The coffee coming through the special piece of paper (filter) is called a filtrate.

Filtration is used in the preparation of the cup of coffee.

Answer:

C. It would stay the same

Explanation:

PLATO answer

Answer:

False.

Explanation:

I majored in Chemistry

Answer:

Furthermore, because hydrofluoric acid, HF, loses a proton, H+1, to generate its conjugate in the reaction that is shown above, this reactant can be classified as a Brønsted-Lowry acid, and, consequently, the fluoride ion, F–1, is the conjugate base of this acid.

Explanation:

hope this helps

The formula of the conjugate base of the Bronsted-Lowry acid, HF​ is represented as F⁻.

The Bronsted-Lowry theory can be described as an acid-base reaction where acid and base react with each other and by an exchange of proton acid, produces its conjugate base and the base creates its conjugate acid.

The Bronsted-Lowry concept is actually an extended version of Arrhenius's theory of acid base. According to the Bronsted-Lowry concept, acid is a substance that donates a hydrogen ion or a proton and forms its conjugate base and the base is a substance that accepts proton and produces its conjugate acid.

Bronsted-Lowry acid can be represented as:

Acid ⇄   Conjugate base +   H⁺

The conjugate base of Bronsted-Lowry acid HF can be represented as follows:

HF   ⇄  F⁻ +   H⁺

Therefore, fluoride ion F⁻ is the conjugate base of the Bronsted-Lowry acid HF​.

Learn more about the Bronsted-Lowry concept, here:

https://brainly.com/question/14407412

#SPJ6

Answer:

becuase of the sun

in different places some places would be cold