CHEMISTRY HIGH SCHOOL

Which sample has particles with the lowest average kinetic energy?(1) 1.0 g of I2 at 50.°C
(2) 2.0 g of I2 at 30.°C
(3) 7.0 g of I2 at 40.°C
(4) 9.0 g of I2 at 20.°C

Answers

Answer 1
Answer: The question asks average kinetic energy. So it is only related with the temperature. The higher temperature is, the higher kinetic energy is. So the answer is (4).
Answer 2
Answer:

Answer : Option 4) 9.0 g of I_(2) at 20°C


Explanation : Usually the average kinetic energy depends upon the state of the matter. Considering about the iodine at lower temperature the kinetic energy is found to be low. Whereas at higher temperature has higher kinetic energy value.


From the kinetic energy equation it can be easily related that K.E. is directly proportional to the temperature.


Refer the attached image for the relationship of temperature with kinetic energy.

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You dissolve 0.74 g of potassium chloride (KCl) in 500 mL of water. What is the molarity of the solution?
Which statement describes an intensive property of matter
What is the empirical formula of a compound that is 79.8% carbon and 20.2% hydrogen?
Which molecules shown on the graph above are likely candidates for evaporation? 1. molecules under the left end of the curve 2. molecules under the apex of the curve 3. molecules under the right end of the curve 4. all molecules under curve "T2"

Which of the following substance is not an acid? 1. Substance A is tested and found to have a pH of 3. 2. Substance B, a common food, tastes sour. 3. Substance C causes metals to corrode. 4. Substance D feels slippery in solution.

Answers

Answer

  • The correct option is 4. feel slippery.

Explanation:

Acid and base have different characteristic which identify either it is acid or base.

1. Substance A is tested and found to have a pH of 3.

This option is for acid because acid have pH in the range of 0-6

2. Substance B, a common food, tastes sour?

This option is also for acid because acid have sour taste.

3. Substance C causes metals to corrode.

This option is also for acid because acid can cause corrosion

4. Substance D feels slippery in solution

This option is not for acid but it is for base because bases have the properties of slippery.
Substance d as it's the only one with none acid traits

Which of these processes indicates that smelting copper is a chemical changea)it involves melting copper to form liquid metal
b)it involves heating charcoal to high tempuratures
c)it involves drawing copper into long wires
d)it involves breaking molecular bonds between copper compounds

Answers

The correct answer is D:


it involves breaking molecular bonds between copper compounds .


The explanation :


-when we melt a copper it is a physical change because the substance is still copper and have the same shape.


- but for example Burning a copper it is a chemical change. Fire activates a chemical reaction between copper and oxygen.


-The oxygen in the air reacts with the copper and the chemical bonds are broken.


- the chemical change is changing the other compound bonded to the copper atoms.


So, the correct answer is D
Answer is d. The material can be phsycal changes into a differnt shape or state (gas, liquid, solid) and its will still be essentially copper. A chemical change is changing what other elements or compound is bonded to the copper atoms

Which of the following examples is a compound containing an ionic bond?A. O2
B. H2O
C. CaO
D. CH4

Answers

Answer:

caO

Explanation:

Final answer:

Among the given options, Calcium Oxide (CaO) contains an ionic bond. This bond is formed through the transfer of two electrons from a calcium atom to an oxygen atom.

Explanation:

The question seeks to identify the compound that contains an ionic bond from the provided options. Ionic bonds are usually formed between metals and non-metals. In these cases, the metal atom donates an electron to the non-metal atom, leading to the formation of a positively charged cation and a negatively charged anion. These oppositely charged ions then attract each other, forming an ionic bond.

Let's look at the options:

  • A. O2 - Oxygen molecules are formed by the sharing of electrons between two oxygen atoms, which is a covalent bond, not ionic.
  • B. H2O - water contains two hydrogen atoms bonded to an oxygen atom. These are covalent bonds as well.
  • C. CH4 - Methane, comprised of carbon and hydrogen atoms, involves covalent bonding.
  • D. CaO - Calcium Oxide is formed by the transfer of two electrons from a calcium atom to an oxygen atom, resulting in an ionic bond. Therefore, CaO is the correct answer.

Learn more about Ionic Bond here:

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Which molecules contain good leaving groups?

Answers

Answer:

proton and neutron

Explanation:

proton is positive while neutron is neutral so they can live togher

. The density of gold is 19.32 g/mL. A U.S. $5.00 gold coin has a diameter of 1.62 cm and a thickness of 0.085 cm. The price of gold is currently $53.90 per gram. What is the value of the gold in the coin. V = π r2 h.

Answers

Answer:

$182 is the value of the gold in the coin

Explanation:

Diameter is 2r, the ratio of the coin is = 1.62cm / 2 = 0.81cm

Following the formula of the volume of the coin:

V = π r² h

V = π*(0.81cm)²*0.085cm

V = 0.172cm³ = mL

As the density of the gold is 19.32g/mL, the mass of 0.1752mL of gold is:

0.1752mL * (19.32g / mL) =

3.385g is the mass of the coin

As the price of the gold is $53.90 / g, the value of the gold in the coin is:

3.385g * ($53.90 / g) =

$182 is the value of the gold in the coin

Final answer:

To find the value of the gold in the coin, calculate its volume using the formula for the volume of a cylinder. The value of gold in the coin is $185.37.

Explanation:

To calculate the value of gold in the coin, we need to find its volume first using the formula for volume of a cylinder:

V = \pi  r^2h.

The radius (r) of the coin is half its diameter, so it is 0.81 cm. The height (h) is 0.085 cm. Plugging in these values, we can find the volume of the coin. Next, we calculate the mass of the gold in the coin using its density and the volume we just calculated. Finally, we multiply the mass by the price per gram of gold to find the value of the gold in the coin.

The volume of the coin is:

V = \pi (0.81 cm)2(0.085 cm)

= 0.178 cm3.

The mass of the gold is:

m = density x volume

= 19.32 x 0.178

= 3.443 g.

The value of the gold in the coin is the value as -

= mass x price per gram

= 3.443 g x $53.90/g

= $185.37.

Learn more about value of gold in a coin here:

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How many protons are in the radioactive isotope 40/19K

Answers

I am assuming K is potassium and potassium atoms have 21 protons and 21 neutrons. hope that helps some
 

The answer to this question is 19
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