CHEMISTRY HIGH SCHOOL

A substance releases heat when it changes froma. liquid to solid
b. solid to gas
c. liquid to gas
d. solid to liquid

Answers

Answer 1
Answer: The answer should be (A) liquid to solid. This is because it releases the heat absorbed by it when it had changed into liquid.
Answer 2
Answer:

Answer:

its D

Explanation:

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How would you be able to use the spectrum of each gas to establish its identity

Answers

You could compar and contrast the identities so you can compare them and identify them

You are throwing an object with a force of 140 N. The object accelerates 19.0 m/s/s. What is the mass of the object?

Answers

Answer:

7.4

Explanation:

F = m × a

F/a = m

m = 140 / 19

m = 7.4

Which of the following two elements will likely form a covalent bond? N and O K and Cl Li and F Na and Sr

Answers

Covalent bonds are also called molecular bonds. These chemical bondings involves atoms sharing electron pairs. Covalent bonding usually happen between 2 non-metals. Non metals are usually found in the left and right most sides of the periodic table. Hence, the answer will be A. N and O since both elements are non-metals. 

Answer: N and O

Explanation:

An ionic bond is formed when a metal  completely transfers its valence electron to a non metal.

Covalent bond is formed by sharing of electrons between two non metals.

A. N and O both are non metals and thus form a covalent bond.

B. K is a metal and Cl is a non metal and thus form an ionic bond.

C. Li is a metal and F is a non metal and thus form an ionic bond.

D. Na and Sr both are metals

What is happening in this picture? Look at the food colouring and explain using the following terms: solute, solvent, dissolving, homogenous.​

Answers

Answer:

picture is not visible....................

A balloon is a sphere with a radius of 5.0 m. The force of air against the walls of the balloon is 45 N. What is the air pressure inside the balloon? (surface area = 12.56 x radius^2; 1 Pa = 1 N/m^2)A. 1.4 x 10^3 Pa

B. 3.6 x 10^2 Pa

C. 1.4 x 10^-1 Pa

D. 3.6 x 10^-2 Pa

***Idk how to solve this... pls explain?? thx :)

Answers

Pressure is the force exerted on an object per unit area. The equation is expressed as:

P = F / A

From the given above, we substitute the values to the equation.

P = F/A
P= F / (12.56r²)
P = 45 N / (12.56 x 5²
P = 0.143 N/m²

Therefore, the correct answer is option C, 1.4 x 10^-1 Pa.

Calculate the number of molecules in 8.4 g of NaOH

Answers

Molar mass NaOH = 40.0 g/mol

number of moles : 8.4 / 40.0 => 0.21 moles

1 mole ---------------- 6.02 x 10²³ molecules
0.21 moles ---------- ?

molecules :  ( 0.21 ) x  ( 6.02 x 10²³ ) / 1

= 1.264 x 10²³ molecules

hope this helps!
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