Which type of change must occur to form a compound?(1) chemical (3) nuclear(2) physical (4) phase

Answers

Answer 1

Answer: To form a compound, we need to change the structure of the molecules and mostly form new bonds between molecules to result in a compound.

A nuclear change changes the element completely and forms new elements, so nuclear is a wrong choice.
A phase change only changes the phase of the element (solid, liquid or gas) but does not change structure, so phase is a wrong choice
A physical change does not change the structure of the molecules, so physical is also a wrong choice.

On the other hand, a chemical change changes the structure of molecules and/or breaks/forms bonds.
Therefore, the right choice is chemical.

Answer 2

Answer:

Answer:

1) Chemical

Explanation:

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Unrestricted populations of organisms experience _____.a. exponential growth
b. linear growth
c. fertility
d. biotic growth
User: As a population reaches its carrying capacity, there is an increase in competition for
a. food.
b. shelter.
c. mates.
d. All of the above

Answers

Answer:

1. A

2. D

Explanation:

1. If a population is left unrestricted, meaning it is not limited to anything, then the population will continue to increase exponentially due to there being no limits.

2. If a population is limited, and it has reached its carrying capacity, then the essential needs of life are being competed for. Things like food, shelter, and mates are now a limited resource, and hence the option would be "all of the above".

Unrestricted populations of organisms experience Exponential growth.

As a population reaches is carrying capacity there is an increase in competition for All of the above.
Hope I helped.

Atoms are the building blocks of elements, molecules, compounds, and mixtures.
true or false?

Answers

Answer:

true

Explanation:

they are the building part of all thing

How many moles in 30.0 grams of h3po4

Answers

Molar mass H₃PO₄ = 98.0 g/mol

1 mole ----- 98.0 g
? mole ------ 30.0 g

moles = 30.0 * 1 / 98.0

= 0.306 moles

hope this helps!

Describe three possible ways in which a hypothesis may arise

Answers

1- By forming evidence.

This is when evidence and statistics are formed and found and can help form a hypothesis.

2- Multiple attempts

This is when multiple attempts form the same product

3- Enough research

Research is shown and enough to prove something.

Given the balanced equation representing a reaction: 2NaCl -> 2Na + Cl2 A 1170. gram sample of NaCl completely reacts, producing 460. grams of Na. What is the total mass of Cl2 produced?

Answers

Given the stoichiometric equation above and the amount of NaCl needed to produce the products, we can determine the amount of products produced. A 1170 gram NaCl using stoich produces 460 grams Na. This means the reaction makes a 100% conversion after. So, the amount of Cl2 produced from stoich is 709.61 grams.

Answer:

710.g

Explanation:

The reaction, 4Fe (s) + 3O2 (g) à 2 Fe2O3 (s), is the rusting of iron. What occurs as the reaction proceeds? a precipitate is formed the color of the solid will change a new odor is given off the solution bubbles

Answers

Answer: the color of the solid will change

Explanation:

A chemical reaction is defined as the reaction in which a change in chemical composition takes place. A new substance is formed in these reactions.

Example: Oxidation of iron to ferric oxide is a chemical change.

$4Fe(s)+3O_2(g)\rightarrow Fe_2O_3(s)$

Here iron which is grey in color changes first to green and then turns brownish red.

Characteristics of a chemical reaction:

1. change in color

2. heat is gained or lost

3. evolution of gas

4. formation of precipitate

The reaction, 4Fe (s) + 3O2 (g) -> 2 Fe2O3 (s), is the rusting of iron. As the reaction proceeds, the color of the solid will change due to the reacction of iron with air. The rest of the choices do not answer the question above.

Other Questions

Carbon forms molecular compounds with some elements from Group 16. Two of these compounds are carbon dioxide, CO2, and carbon disulfide, CS2.Carbon dioxide is a colorless, odorless gas at room temperature. At standard temperature and pressure, CO2(s) changes directly to CO2(g). Carbon disulfide is formed by a direct reaction of carbon and sulfur. At room temperature, CS2 is a colorless liquid with an offensive odor. Carbon disulfide vapors are flammable. 59 Identify one physical property and one chemical property of CS2. [1]

Which of the following is NOT a pure substance?a. solutionb. elementc. moleculed. compound

Air tends to move from _____.a. the equator to the poles b. conduction c. cold air rising and warm air sinking d. radiation

Which missing item would complete this beta decay reaction?