CHEMISTRY MIDDLE SCHOOL

Please help with the last problem!
Please help with the last problem! - 1

Answers

Answer 1
Answer: Radiation: Heat from the stovetop.
Conduction: Heat from Stove to Pot.
Convection: Water boiling.
I will now take my points.
Answer 2
Answer: Conduction: Heat from Stove to Pot. 
Convection: Water boiling.
Radiation: Heat from the stovetop. 

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What is the first element on the periodic table?

Answers


Hydrogen, H.

I hope this helps!
Hydrogen.
I hope this helps.

What is a magnet? Explain what it is please.

Answers

A magnet is a material usually composed of iron, ore or another metallic alloy that has its component atoms so ordered that the material exhibits properties of magnetism, such as attracting other metal alloy objects or aligning itself in an external magnetic field.

Which label belongs in the region marked X?Chang makes the diagram below to compare Gay-Lussac's
law and Charles's law.
Gay-Lussac's Law Charles's Law
O involves changes in temperature
O has a constant volume
O shows an inversely proportional relationship
O does not involve pressure changes

Answers

Answer:

A) involves changes in temperature

Explanation:

The figure is missing, but I assume that the region marked X represents the region in common between Gay-Lussac's law and Charle's Law.

Gay-Lussac's law states that:

"For an ideal gas kept at constant volume, the pressure of the gas is directly proportional to its absolute temperature"

Mathematically, it can be written as

p\propto T

where p is the pressure of the gas and T its absolute temperature.

Charle's Law states that:

"For an ideal gas kept at constant pressure, the volume of the gas is directly proportional to its absolute temperature"

Mathematically, it can be written as

V\propto T

where V is the volume of the gas and T its absolute temperature.

By looking at the two descriptions of the law, we see immediately that the property that they have in common is

A) involves changes in temperature

Since the temperature is NOT kept constant in the two laws.

What do solutions and colloids have in common

Answers

well ... there are sm common things between solutions and colloids

solutions even and fully mixed together and so are colloids

when we let solutions and colloids settle down both of them do not have boundaries ... the particles of colloids and solutions do not settle down

Both are liquids. Both will pass through filters without seperation.

You can see through a solution, as the ions of the solute are dissolved. A colloid is a suspension of insoluble ultra microscopic particles or large molecules in water or other liquid, kept in suspension by Brownian motion.

What cause local winds to form?

Answers

 Local winds are small-scale winds produced by local changes in air pressure
Dits causes from air when it's raining and then it stops and I The wind will come

if you have 0.5 grams of CaCl2 dissolved to make 15mL of solution, what is the molarity of the solution?

Answers

Answer:

0.3M

Explanation:

Molarity of a solution is given by;

M=n/v

Where;

n= number of moles of solute = mass of solute / molar mass

v= volume of solution

n= mass of CaCl2 / molar mass of CaCl2

Mass of CaCl2 = 0.5

Molar mass of CaCl2 = 40 + (2×35.5)

= 111g/mol

n = 0.5/111 = 0.0045mol

volume, v= 15mL = 15/1000 L = 0.015L

Note that molarity is in mole per liter, hence we convert 15mL to L. 1mL=1/1000L

M =0.0045/0.015

M=0.3mol/L

Therefore, the molarity of the solution is 0.3M

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