Which of these would be easily soluble in water?a. salt
b. oil
c. aluminum foil

Answers

Answer 1

Answer: A) Salt, because salt can easily dissolve in water. Oil would not dissolve or evaporate in water (think of an oil spill - does that oil dissappear?). Aluminum foil would definitely not dissolve in water, so it is not soluble.

Answer 2

Answer:

Answer:

salt

Explanation:

because is logic sense lol

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when 1.00 mol of no( g ) forms from its elements, 90.29 kj of heat is absorbed. how kj much heat is evolved when 2.79 g of no decomposes to its elements? assistance

Answers

Molar Mass of the NO = 14 g/mol + 16 g/mol = 30 g/mol

Number of mols is 2.79 g = 2.79mol/30g/mol = 0.093 mol

Heat released by the decomposition of 0.093 mol = 92.29kj/mol * 0.093 mol = 8.58 kj (you might include a negative sign to indicate tha the heat is released)

The formation of rust is represented by the following reaction: 4Fe + 3O2 → 2Fe2O3 + energyIs this reaction exothermic or endothermic? How do you know?

Answers

Answer:

Exothermic

Explanation:

An exothermic reaction is defined as a reaction where heat/energy is released. In the formation of rust, iron reacts with oxygen gas to form ferric oxide and energy. Energy in the products side indicates a release of energy, thus making this reaction exothermic.

Choose all answers that applyPLZ HELP ASAP i am doing a test and i need help. I WILL BE DOING BRAINLIEST TO THE FIRST PERSON WHO REPLYS
When dynamite explodes, it releases a large amount of light and heat. This is an example of _____.

slow combustion
rapid combustion
an exothermic reaction
an endothermic reaction
a chemical change
a physical change

Answers

Answer

Rapid Combustion

Explanation:

An explosion is a combustion and a quick reaction, That makes it rapid

Examine the graph below.Choose which of the following is NOT true.

Absolute zero on Kelvin scale is -273°C.
Liquefaction of the gas occurs at approximately -155°C.
Condensation occurs at 0°C.
The gas follows a linear relationship between volume and temperature.

Answers

Answer : The incorrect option is, Condensation occurs at $0^oC$ .

Explanation :

Absolute zero on Kelvin scale is $-273^oC$ .

This statement is correct because at $0K$ the temperature in degree Celsius will be, $0K=0-273=-273^oC$

Liquefaction of the gas occurs at approximately $-155^oC$ .

This statement is correct. From the given graph the liquification of gas occurs at $-155^oC$ .

The gas follows a linear relationship between volume and temperature.

This statement is correct. According to the Charles law, the volume of gas is directly proportional to the temperature of the gas. So, gas follow the linear relationship between the volume and temperature.

Condensation occurs at $0^oC$ .

This statement is incorrect because condensation occurs at $100^oC$ . and the condensation is a process in which the phase changes from the gaseous state to liquid state at constant temperature.

As we know that condensation is a reverse process of vaporization. Both the process occurs at constant temperature $100^oC$ .

Hence, the incorrect option is, Condensation occurs at $0^oC$ .

Obviously from the graph, the relationship is linear. Charle's laws also say that so that one can be eliminated. Also using the points on the graph, abolute 0 is -273 and liquefication occurs around -155. That sets the answer to Condensation occurs at 0

Choose the letter of the choice that best completes the statement or answers the question. Elements in the same group have the same __________. A. atomic radius
B. energy level of outer electrons
C. nuclear charge
D. number of valence electrons

Answers

I think the correct answer from the choices listed above is option D. Elements in the same group have the same number of valence electrons. They have the same number of electrons in the outer orbital. They are the electrons that are involved with chemical bonding with other elements.

Elements in the same group have D. Same number of valence electrons.

Answer the following question using the reaction: AB ---> A+BWhich statement describes the above reaction.