Please help on question 7 and 8, i really need help and this is for marks! I only have 9 min left i will mark brainliest to whoever gives the best answer!

Answer:

I don't know what the passage says, but I feel like the most logical conclusion is D or the last one.

Explanation:

Answer:

D! Hope this helps! Figured id help with all of ur questions!

Explanation:

Im a wiz at science! ;)

Answer:

C, between P and Pb, largest atom is Pb

The larger atom from each of the following pairs is as,

a. Between Se and Te, the larger atom is Te .

b. Between I and Kr, the larger atom is I .

c. Between P and Pb, the larger atom is Pb .

d. Between Ge and Br, the larger atom is Ge .

e. Between G e and B r, the larger atom is Ge .

In periodic table, on moving from top to bottom  in a group the atomic size of elements increases while on moving left to right in a period the atomic size of elements decreases.

To learn more about periodic table here.

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Answer:

o He

Explanation:

basyshsiz0qnshshhsjzz

Answer:

3.5

Explanation:

500*0.175= 8.75 *40/1000=3500/1000=3.5

Answer:

3.50 grams

Explanation:

Mastering chem

Answer:

Eukarya

Explanation:

It's larger than a prokaryotic cell and it has a nucleus.

Answer:

mook passes between the earth and sun

Answer:

87.15%

Explanation:

To find percent yield, we can use this simple equation

[tex]\frac{Actual}{Theoretical} *100[/tex]

Where "Actual" is the amount in grams actually collected from the reaction, and "Theoretical" is, well, the theoretical amount that should have been produced.

They give us these values, so to find the percent yield, just plug the numbers in.

[tex]\frac{30.85}{35.40} *100\\\\ =87.15[/tex]

So, the percent yield is 87.15%

An easy trick to remember how to do this is just to divide the smaller number by the bigger number and move the decimal back two places. If you have a percent yield greater than 100%, something is wrong in the reaction.

Answer:

I agree with Omar because it depends on what the charge of the object and magnet is. If the magnet is negative and the object is positive, they will pull together. If the magnet is negative and the object is negative then they will pull apart.

Explanation:

Answer:

1.61 atm

Explanation:

Using general gas law equation as follows:

PV = nRT

Where;

P = pressure (atm)

V = volume (L)

n = number of moles (mol)

R = gas law constant (0.0821 Latm/molK)

T = temperature (K)

From the information provided in this question,

V = 5.00L

T = 350K

mass of O2 = 9.00g

Using mole = mass/molar mass

Molar mass of O2 = 16(2) = 32g/mol

mole = 9/32

mole = 0.28mol

Using PV = nRT

P = nRT/V

P = 0.28 × 0.0821 × 350/5

P = 8.0458/5

P = 1.609

Pressure = 1.61 atm

The pressure of the oxygen gas at the given temperature and volume is 1.61 atm.

The given parameters;

The number of the moles of the given gas is calculated as follows;

[tex]moles = \frac{m}{M} \\\\moles = \frac{9}{32} \\\\moles = 0.28 \ mol[/tex]

The pressure of the gas is calculated as follows;

[tex]PV = nRT\\\\P = \frac{nRT}{V} \\\\P = \frac{0.28 \times 0.0821 \times 350}{5} \\\\P = 1.61 \ atm[/tex]

Thus, the pressure of the oxygen gas at the given temperature and volume is 1.61 atm.

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Answer:

there are 1.4201927800478769 moles in 83 particles of sodium chloride. or 1.42 for short.

Explanation:

Answer:

yes. For a pop bottle biome to be self sustaining it needs a water cycle, mineral cycle, solar energy flow, and a balance.

Explanation:

hope this helps

Answer:

I would say no because you have to add water and other recourses for it to grow and work

Explanation:

Answer:

the wind and the temperature of water both drive ocean currents

Answer:

B. Write 'T' for true or 'F' for false statements :

1. Publisher works only with document in fixed shapes and sizes.

2. Viewing tools are only for editing purpose.

3. Text box icon is found in Styles group.

4. Publisher does not allow you to add images to your document.

5. Margin guides are blue lines that mark the edges.

Through satellites...

Answer:

Answer:

I think the answer is All of these ions

Answer:

2

Explanation:

Answer:

C) Carbon dioxide is the answer.

Answer:

C. Carbon Dioxide

Carbon is absorbed by plants and chemically converted to oxygen via photosynthsis.

Hope this helps!

Explanation:

Water is called the "universal solvent" because it is capable of dissolving more substances than any other liquid. This is important to every living thing on earth. It means that wherever water goes, either through the air, the ground, or through our bodies, it takes along valuable chemicals, minerals, and nutrients.

Answer:

producer

Explanation:

Answer:

none of the above

Explanation:

Answer: The correct answer is 5.00 moles

Explanation:

Answer:

2.77×2= 5.4 mol Ag can be obtained

Answer:

2N₂H₄+N₂O₄→3N₂+4H₂O; N₂H₄ gets oxidized, N₂O₄ gets reduced.

Explanation:

They tell us what substances react to form what products, so we can write an unbalanced chemical equation from those substances.

N₂H₄+N₂O₄→N₂+H₂O

To balance this equation, we need to make it so there is an even amount of each element on both sides of the reaction. We can do this by multiplying the amount of each substance by adding a coefficient in front of it.

2N₂H₄+N₂O₄→3N₂+4H₂O

To identify what is being oxidized and what is being reduced, look at the oxidation charges of each element.

N₂H₄ gets oxidized, N₂O₄ gets reduced.

Answer:

I guess it WATER

Answer:

The height of A is 900

Explanation: Beside A, there is a number which explains what the height is so the answer is A.

Answer:

[tex]\boxed {\boxed {\sf Different \ amount \ of \ protons, neutrons, \ and \ electrons}}[/tex]

Explanation:

Remember that a mole is equal to Avogadro's number: 6.022*10²³ atoms. Also, remember that an atom is made up of protons, neutrons, and electrons. Each element has a different amount of each.

If an element has more of these particles in 1 atom, then the atomic mass will be greater, ultimately making the molar mass (mass of 1 mole) greater.

Silicon has 14 protons, electrons, and neutrons, making its atomic mass 28.085 amu and its molar mass 28.085 grams. However, carbon only has 6 of each particle, so its atomic mass is smaller at 12.011 amu and molar mass is 12.011 grams.