How many atoms of each element are present in

Answer:

D

Explanation:

Answer:

C) gold - zinc - magnesium - lithium

Answer:

i just feel rlly bad that you need it now, i cant help but all i can say is you got this mate

Answer: A, C, D

Explanation:

Right on Edge

Answer:

1.) Charging rechargeable batteries allows the non-spontaneous reaction within the batteries to proceed.  

3.) The rechargeable battery is an example of a voltaic cell.

4.) The rechargeable battery is an example of an electrolytic cell.

Explanation:

got it right on edge

Answer:

4.0625

Explanation:

1 grams Oxygen to mol = 0.0625 mol

0.0625 x 65 =4.0625

Answer:

what the other guy said

Explanation:

Answer:

A. hibernation

Answer:

Hibernation.

Explanation:

Answer:

18.88 grams of Al2O3

Explanation:

Here's my work

10g Al    l    1 mol Al    l    1 mol Al2O3  l   102g Al2O3

             l    27g Al       l   2 mol Al         l    1 mol Al2O3

Balanced equation: 2Al +Fe2O3  --> Al2O3 + 2Fe

So pretend it's in a chart,  you fill it out starting from the top left corner and then moving diagonally down and then straight up and then diagonally down and the straight up, etc.  You start with 10 grams of Al, so the first thing you want to do is convert it into moles.   So you find the mass of Al(which is 27) and then you have 1 mol of Al on top.  So the next thing you have to do is to change it to Al2O3 since that is what the question is asking for.  This is where it's important you balanced the equation correctly because you're going to compare the mol ratios.  To do this, you have to look at the coefficients in front of Al, which is a 2.  so you write 2 mol Al on the second bottom section.  and then on top you look at the balanced equation again and look at the coefficient in front of Al2O3, which there is none so it's a 1.   Then all you have to do is convert back to grams because the question wants it in grams.  so you put 1 mol on the bottom and then you look at your periodic table to figure out the mass of Al2O3.    Al= 27,  O= 16.   (27x 2) +  (16 x 3)  = 102.     Finally you just multiply all the numbers on the top row and then multiple all the numbers on the bottom row and then divide what you get on the top by the bottom.  

Answer:

whats the theisis

Explanation:mmm ok

Explanation:

1 mol of an atom (irregardless of the element) contains the Avogadro's number of atoms. This is given as;

1 mol = 6.022 * 10^23 atoms

For a neutral atom;

NUmber of protons = Number of electrons

The relationship between proton and neutron is given as;

Mass Number = Protons + Neutrons

Ag-108

Atoms =  6.022 * 10^23 atoms

Protons = Atomic Number = 47

Electrons = 47

Neutrons = Mass Number - Protons = 108 - 47 = 61

Pt-195

Atoms =  6.022 * 10^23 atoms

Protons = Atomic Number = 78

Electrons = 78

Neutrons = Mass Number - Protons = 195 - 78 = 117

Answer: B

Explanation: The clouds act almost like a lid. Think of it like when you put tin foil over food before it goes in the oven. so that even after it is removed from the heat the tin foil traps it causing it to stay warm.

Answer:

0.8 moles

Explanation:

2H2+O2 —›2H2O

Since , from given balanced chemical Equation.

2moles of H2 produce 2 moles of Water

So,

2moles H2= 2moles H2O

1moles H2= 1 mole of H2O

For 0.8 mole of H2O, multiply both sides by 0.8

0.8 H2=0.8 H2O

0.8 mole of H2= 0.8 mole H2O

So answer is 0.8 moles

Answer:

Zinc oxide is react with sulphuric acid to give zinc sulphate and water.

zinc oxide +sulphuric acid ⇒ zinc sulphate + water

Zno    +H2So4 ⇒ZnSo4 + H2O

SULPHURIC ACID = H2SO4

ZINC SULPHATE =ZnO

Explanation:

Answer:

120 km

Explanation:

If he goes 20km/h and travled for 6 hours then he would have gone 120 km. 20 multiplied by 6

Answer:

Cu(OH)₂ ⇒ copper(II) hydroxide

Explanation:

Copper(II) nitrate (Cu(NO₃)₂) dissociates into ions in an aqueous solution to form Cu²⁺ ions and NO₃⁻ (nitrate) ions. If the aqueous solution contains sodium hydroxide (NaOH), which dissociates into Na⁺ and OH⁻ ions, a precipitate is formed from Cu²⁺ and OH⁻ ions. The precipitation reaction is the following:

Cu(NO₃)₂(aq) + 2 NaOH(aq) → Cu(OH)₂(s) + 2 NaNO₃(aq)

The light blue precipitated formed is copper (II) hydroxide (Cu(OH)₂), because it is an insoluble solid product.

Answer:

2.6299

its easy

Answer:

sulfur hexafluoride....

Answer:

Explanation:

Sulfur hexafluoride (SF6) or sulphur hexafluoride (British spelling), is an extremely potent and persistent greenhouse gas that is primarily utilized as an electrical insulator and arc suppressant. It is inorganic, colorless, odorless, non-flammable, and non-toxic. SF.

The best way for helping the earth water supply that should be last for future generations should be considered option b. where it decrease the residential water usage.

The average American family should be used for more than 300 gallons of the water per day at home. Approximately 70% of the use should arise indoors,

Moreover, outdoor water should be accounted for 30% of household that should be high in drier parts for the country and it should be more water intensive landscape.

Therefore, the option b is correct.

Learn more about water here: https://brainly.com/question/20229458

Answer:

What type of plant

Where is it mainly found

What are some facts about it?

Answer:

Cancer is a disease caused when cells divide uncontrollably and spread into surrounding tissues.

Explanation:  Cancer is caused by changes to DNA. Most cancer-causing DNA changes occur in sections of DNA called genes. These changes are also called genetic changes.

-Hope this helped

Answer:

4. 125°C

Explanation:

I hope this helps you :D

Answer:

Explanation:can you take a pic of it a little up so i can see the h please??

Answer:

[Kr] 4d² 5s² option b will be correct answer

Answer:

1) increases

2)increases

3) Decreases

4) increases

5) increase

6) decreases

Explanation:

Let us remember that in a solid, the molecules of the substance are trapped in fixed positions hence the entropy of a solid is less than that of liquid as well as less than the entropy of a gas.

Reaction (1) and (2) deal with a change of state from solid to liquid or gas leading to increase in entropy.

In reaction (3) the aqueous reactants convert into a liquid product leading to a decreases in entropy.

Reaction (4) and (5) has to do with change of a solid to a gas as well as an increase in volume leading to an increase in temperature.

For reaction(6), a solid is formed so entropy decreases

Answer:

4777.09grams

Explanation:

To find the mass of oxygen, we first need to find the mass of potassium sulfate (K2SO4).

Since there are 4.50 x 10^25 formula units of potassium sulfate, we can find the number of moles in K2SO4 by dividing by Avagadros number (6.02 × 10^23 units). That is;

number of moles of K2SO4 (n) = 4.50 x 10^25 ÷ 6.02 × 10^23

= 0.747 × 10^ (25-23)

= 0.747 × 10^2

= 7.47 × 10^1 moles

Mass in grams of K2SO4 can be calculated thus: molar mass of K2SO4 × moles

= 174.252 g/mol × 7.47 × 10^1 moles

= 13016.62grams.

Since mass of oxygen in 1 mol of K2SO4 = O4 = 63.996 g/mol

We find the percentage by mass of oxygen in K2SO4 as follows:

= 63.996/174.252 × 100

= 0.367 × 100

= 36.7% by mass of oxygen.

This means that in 1gram of K2SO4, there are 0.367gram of Oxygen. Hence, in 13016.62grams (4.50 x 10^25 units) of K2SO4, there will be;

0.367 × 13016.62

= 4777.09grams of oxygen.

Answer:

you get one of their pizzas and then put more toppings on cheese on the pizza

Explanation:

Answer:

flower

Explanation:

Answer:

The intercostal muscles also stabilize the chest wall; in full inspiration they contract to prevent the intercostal spaces being sucked inwards by the negative intrathoracic pressure generated by contraction of the diaphragm.

Explanation:

Hope this helps! Brainliest is always appreciated :)