CHEMISTRY MIDDLE SCHOOL

Which is an example of an atom?A)the smallest unit of Ne
B)the smallest unit of p4
C)the smallest unit of NH3
D)the smallest unit of H2O

Answers

Answer 1
Answer: It is A)The smallest unit of Ne 

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What is the definiten for chemiacal weathering

Answers

the breakdown of rocks by chemical mechanisms 
Chemiacal weathering is the process which breaks down rocks. 

Find the molarity of a 450 mL solution containing 13.7 g of ZnSO4.​

Answers

Answer:

The molarity is 0.189 (moles)/(liter)

Explanation:

Molarity is a measure of concentration of a solution that indicates the number of moles of solute that are dissolved in a given volume. In other words, the molarity indicates the amount of moles of solute that appear dissolved in each liter of the mixture.

Molarity is determined by the expression:

Molarity (M)=(number of moles of solute)/(Volume)

Molarity is expressed in units ((moles)/(liter)).

So, you need to know the amount of moles of ZnSO₄. Then you must know the molar mass. If:

  • Zn: 65 g/mol
  • S: 32 g/mol
  • O: 16 g/mol

the molar mass of ZnSO₄ is:

ZnSO₄= 65 g/mol + 32 g/mol + 4* 16 g/mol= 161 g/mol

Then you can apply a rule of three as follows: if 161 g of ZnSO₄ is contained in 1 mole, 13.7 g in how many moles are they?

moles=(13.7 g*1 mole)/(161 g)

moles=0.085

Then you know:

  • number of moles of solute= 0.085 moles
  • Volume= 450 mL (Being 1 L=1,000 mL)

Replacing in the definition of molarity:

Molarity= (0.085 moles)/(0.45 L)

Molarity=0.189 (moles)/(liter)

The molarity is 0.189 (moles)/(liter)

Which of these elements elements has an electron configuration of [Kr]5s2

Answers

Your answer is strontium

Which factor is MOST responsible for the ocean tides

Answers

The moons gravitational pull on the Earth.

Answer:

The answer would be gravity

Explanation:

Sorry if I'm wrong

Guys, please help me and tell me how you found the answer! If a gas has a pressure of 1.69 atm at a temperature of 300 K, what will the pressure change to if the container is cooled to 100 K?

Also


If a gas has a pressure of 715 mm Hg at the temperature of 500 K, what will the pressure change to if the container is heated to 900 K?

Answers

The pressure has been reduced with the cooling of the container, and the change in pressure has been 1.06 atm. The pressure has been increased with the heating of the container and the change in pressure has been 572 mm Hg.

Assuming the gas has been following the ideal behavior. According to the ideal gas equation,

PV =nRT

If the same gas has been heated, the n and R will be constant, as well as with the constant volume of initial and final pressure, the relationship to the P and T can be given as:

\rm (Initial\;pressure)/(Initial\;temperature)\;=\;(Final\;pressure)/(Final\;temperature)

(a) For the gas with an initial pressure of 1.69 atm, the final pressure will be:

\rm (1.69)/(300)\;=\;(Final\;Pressure)/(100)

Final pressure = 0.563 atm.

The change in pressure = Initial pressure - Final pressure

The change in pressure = 1.63 - 0.563 atm

The change in pressure = 1.06 atm.

The pressure has been reduced with the cooling of the container, and the change in pressure has been 1.06 atm.

(b) For the gas at initial pressure 715mm Hg, the final pressure will be:

\rm (715)/(500)\;=\;(Final\;Pressure)/(900)

Final pressure = 1,287 mm Hg.

The change in pressure = Final pressure - Initial pressure

The change in pressure = 1,287 - 715 mm Hg

The change in pressure = 572 mm Hg

The pressure has been increased with the heating of the container and the change in pressure has been 572 mm Hg.

For more information about the change in pressure, refer to the link:

brainly.com/question/12152879

Answer:

The First one is: 0.563atm

The second one is: 1.692atm

Hope this helps!

Explanation: Look at Photo Attached

Need help asap Collect 5 different items around your house. You will investigate the physical and chemical changes that these items could go through. List your 5 items, describe their characteristics (color, size, shape, etc). Describe the physical and chemical changes each item could go through. Fill in the chart below

Answers

Answer:

Explanation:

1. Apple: Characteristics - Red color, round shape, medium size.

- Physical Change: Cutting the apple into slices.

- Chemical Change: Apple slices turning brown when exposed to air.

2. Candle: Characteristics - White color, cylindrical shape, small size.

- Physical Change: Melting the candle wax when exposed to heat.

- Chemical Change: Burning the candle, where the wax reacts with oxygen to produce heat, light, and carbon dioxide.

3. Iron nail: Characteristics - Silver color, cylindrical shape, small size.

- Physical Change: Bending the nail with force.

- Chemical Change: Rusting of the nail when exposed to moisture and oxygen in the air.

4. Ice cube: Characteristics - Transparent color, cuboidal shape, small size.

- Physical Change: Melting the ice cube when exposed to heat.

- Chemical Change: Dissolving the ice cube in water, where the solid water molecules break down into liquid water molecules.

5. Paper: Characteristics - White color, flat shape, medium size.

- Physical Change: Folding the paper into different shapes.

- Chemical Change: Burning the paper, where the cellulose fibers in the paper react with oxygen to produce ash, heat, and carbon dioxide.

It's important to consider the specific characteristics and properties of each item when determining the possible changes they can undergo.

Answer: One idea for one item you could write on SLIME!

Explanation: for an idea for one item, you could do slime for characteristics you could write about the chemical change and of course, since slime sits out, you could write about the physical change for chemical change, you could write about how the chemicals make it smell.

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