Pls help me ASAP thank you!!

Answer:

THE 3 third one

Explanation:

Answer:Zinc grams to moles

Molar mass of Zinc(Zn) = 65.38 g/mol. This means 1 mol of Zn is 65.38g . To find the number of moles of Zn, we divide the given amount of Zn by the molar mass of Zn. Hence, 1.34 g of Zn contains 0.020 moles of Zinc

Explanation:

1 mole is equal to 6.023 × 10 ²³ molecules. The mass of 1.46 mole of zinc is 1.34 grams.

The term mole is defined as the amount of substance of a system which contains as many elementary entities.

The mole concept can be used to convert between mass and number of particles.

One mole of any substance is equal to 6.023 × 10²³ units of that substance such as atoms, molecules, or ions. The number 6.023 × 10²³ is called as Avogadro's number or Avogadro's constant.

Molar mass of Zinc(Zn) = 65.38 g/mol.

This means 1 mol of Zn = 65.38g .

To calculate the number of moles of Zn, we divide the given amount of Zn by the molar mass of Zn.

Hence, 1.34 g of Zn contains 0.020 moles of Zinc.

To learn more about the mole, follow the link;

https://brainly.com/question/26416088

#SPJ2

Answer: flood

Explanation:

The type of reaction that occurs when Carbon-14 changes to Carbon-12 is fission reaction. The correct option is D.

Nuclear fission is the operation by which an atom's nucleus splits into two or several smaller nuclei.

Even by radioactive decay's energetic standards, the fission process frequently produces gamma photons and releases a large amount of energy.

Nuclear energy can be used to generate electricity, but it must be liberated from the atom first. Atoms are split to release energy during the nuclear fission process.

The decay of carbon-14 is another nuclear reaction that we can use. Carbon is a necessary element for living organisms that constantly exchange carbon, the majority of which is carbon-12.

However, some of those carbon atoms are carbon-14 isotopes.

Thus, the correct option is D.

For more details regarding nuclear fission, visit:

https://brainly.com/question/913303

#SPJ2

Answer:

2FeBr₃ + 3H₂SO₄ ⇒ Fe₂(SO₄)₃ + 6HBr

Explanation:

match the products and reactants of both sides.

Answer:

MgO has a highest melting point

C5Br has lowesst

Explanation:

It takes a lot of energy to overcome the strong electrostatic forces of attraction between oppositely charged ions, so ionic compounds have high melting and boiling points. ... Magnesium oxide is made from ions with two charges (Mg 2+ and O 2-) and so has a much higher melting point of 2852°C.

Answer:

Gina Should Put Rubber Tires Under The  Synthetic Category

Gina Should Put Starch Under The Natural Category

Explanation:

Edge 2020

Answer:

Gina Should Put Rubber Tires Under The  Synthetic Category...(C)

Gina Should Put Starch Under The Natural Category...(D)

Explanation:

hope this helps. the person above me is also correct

You can't make observation because the minimum mass is not reached

The atomic nucleus can experience decay into 2 particles or more due to the instability of its atomic nucleus.  

Usually radioactive elements have an unstable atomic nucleus.  

The main particles are emitted by radioactive elements so that they generally decay are alpha (α), beta (β) and gamma (γ) particles  

General formulas used in decay:  

[tex]\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{t/t\frac{1}{2} }}}[/tex]

T = duration of decay  

t 1/2 = half-life  

N₀ = the number of initial radioactive atoms  

Nt = the number of radioactive atoms left after decaying during T time  

Nitrogen-16 has a half-life of 7.1 s, so t1/2 = 7.1 s

T=duration of decay  = 57 s

No= initial sample = 100 g

Nt expectes(at least) : 0.5 g

Amount of Nt after 57 s :

[tex]\tt Nt=100.\dfrac{1}{2}^{57/7.1}\\\\Nt=0.383~g[/tex]

So you can't make observation(0.383 < 0.5)

Answer:

3.3 mol HCl

General Formulas and Concepts:

Chemistry - Atomic Structure

Explanation:

Step 1: Define

120 g HCl

Step 2: Identify Conversions

Molar Mass of HCl - 36.5 g/mol

Step 3: Convert

[tex]120 \ g \ HCl(\frac{1 \ mol \ HCl}{36.5 \ g \ HCl} )[/tex] = 3.28767 mol HCl

Step 4: Check

We are given 2 sig figs as our lowest. Follow sig fig rules and round.

3.28767 mol HCl ≈ 3.3 mol HCl

Answer:

An independent variable is what is being changed. A dependent variable is affected by this change.

Explanation:

For example, if we play classical music in front of plants, will they grow quicker?

The music is the independent variable and the growth time of the plant is the dependent.

Niobium-91 will remain 93.75 g

The atomic nucleus can experience decay into 2 particles or more due to the instability of its atomic nucleus.  

Usually radioactive elements have an unstable atomic nucleus.  

The main particles are emitted by radioactive elements so that they generally decay are alpha (α), beta (β) and gamma (γ) particles  

General formulas used in decay:  

[tex]\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{T/t\frac{1}{2} }}}[/tex]

T = duration of decay  

t 1/2 = half-life  

N₀ = the number of initial radioactive atoms  

Nt = the number of radioactive atoms left after decaying during T time  

Half life -t1/2 of Niobium-91 =680 years

T=duration time=2040 years

No=initial sample=750 g

Niobium-91 will remain :

[tex]\tt Nt=750\dfrac{1}{2}^{2040/680}\\\\Nt=750.\dfrac{1}{2}^3\\\\Nt=93.75~g[/tex]

Answer: C. 37.5 g

Explanation: On edge 2021

Answer:

Diagram B is a mixture of compounds

Explanation:

The false statement about any of the diagram is that diagram B is a mixture of compounds.

Diagram is not a mixture of compounds. It is a single compound in gaseous state .

Answer:

phosphorous(iii) oxide

Explanation:

Hope this helps! :)

Answer:

About 500

Explanation:

Bc i used my calc

Answer:

The same number of molecules, 6.0 × 10²³ molecules.

Explanation:

The amount of any given gas that can be stored in a container depends on the temperature, pressure and volume of the container. It does not depend on the nature (or identity) of the gas.

So if a 10-liter flask contains 6.0 × 10²³ molecules of hydrogen gas, it will contain the same amount of molecules of any other gas when temperature and pressure remain constant.

Answer:

He would travel 3 kilometers.

Explanation:

Since he had already covered 1.5 kilometers in the time of 1 hour that means if he jogged for 1 more hour assuming he is going at the same pace he would've jogged 1.5 kilometers again and when you add that to the 1.5 kilometers he started with it would add up to 3 kilometers.

Answer:

An example of an energy transformation that occurs in the natural world is the process of photosynthesis. In the Sun, chemical energy transforms into light and thermal energy. Plants transform the Sun's light energy into chemical energy during the process of photosynthesis.

Explanation:

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

mass = Density × volume

From the question we have

mass = 2.7 × 2.5

We have the final answer as

Hope this helps you

Answer:

12.34 amu

Explanation:

Let the 1st isotope be A

Let the 2nd isotope be B

Let the 3rd isotope be C

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

1st Isotope (A):

Mass of A = 12.32 amu

Abundance (A%) = 19.5%

2nd isotope (B):

Mass of B = 13.08 amu

Abundance (B%) = 26.23%

3rd isotope (C):

Mass of C = 11.99 amu

Abundance (C%) = 54.27%

Atomic mass of X =?

The atomic mass of the element X can be obtained as follow:

Atomic mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100] + [(Mass of C × C%)/100]

= [(12.32 × 19.5)/100] + [(13.08 × 26.23)/100] + [(11.99 × 54.27)/100]

= 2.402 + 3.431 + 6.507

= 12.34 amu

Thus, the atomic mass of the element X is 12.34 amu

Answer:

Matter cannot be created destroyed

Explanation

Matter can change form through physical and chemical changes, but through any of these changes, matter is conserved. The same amount of matter exists before and after the change—none is created or destroyed. This concept is called the Law of Conservation of Mass.

Answer:

Number of protons

Explanation:

The number of protons in one atom of an element determines the atom's identity, and the number of electrons determines its electrical charge.

Answer:

Nope unless u like the ex it’s super wrong but if u like their friend ur good

Explanation:

[tex]\huge\mathcal\pink{Answer:-}[/tex]

★ The H2O (moisture) concentration in the air over deserts differ dramatically from the air in the tropical rainforests.

Answer:

False

Explanation:

Just trust up I just did it

Answer:

rainfall/water

Explanation:

The possession of drip tips by the leaves of plants in the rainforest is a form of adaptation against high rainfall. Without the drip tips on leaves, water will persist on the surface of leaves, and in conjunction with the warm climate, promotes the growth of pathogens such as fungi and bacteria.

Hence, the possession of drip tips on leaves is an indication of the prevalence of water in the rainforest region.

Answer:

Sodium sulphate

Or sodium (I) sulphate

Explanation:

Sodium sulfate(VI) has the formula Na2SO4 - the sulfur is the element with a variable oxidation number; in this case +6.

SODIUM SULFATE

Sodium sulfate

PubChem CID                 24436

Molecular Formula                 Na2SO4 or Na2O4S

Synonyms                         SODIUM SULFATE 7757-82-6 Disodium                                      

sulfate Sodium sulfate, anhydrous Sodium sulfate More.

Molecular Weight                    142.04

Component Compounds    CID 1118 (Sulfuric acid) CID 5360545

(Sodium).

The name and function of salt compounds change with the presence or absence of water in their crystalline structures. For example, sodium sulfate, NaSO4, is called anhydrous sodium sulfate when free of water and is used as a drying material.

Learn more about sodium sulfate at

https://brainly.com/question/2650481

#SPJ2

Answer:

direct

Explanation:

the more dense it is the more pressure it will exert