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25.12.2020

A student applies heat to a solid substance. Which indicates that a chemical change occurred?

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19.10.2022, solved by verified expert

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Answer:

Chemical change

Step-by-step explanation:

A chemical change occurs when a substance combines with other substance and a new substance of new properties is formed.

It is not reversible.so on heating a solid substance if it changes its colour permanently and never come back.in its original colour again.

If the solid burns and form ash than it will be a chemical change.

If a new substance of different ccolour and odour is formed than it will be a chemical change.

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Biology

1.changes to a substance that do not involve a permanent reordering of atoms are know as physical changes. endothermic changes. irreversible changes. chemical changes. 2.changes that reorder atoms to form new molecules, such as the reaction between sodium and chlorine ions to form sodium chloride, are known as irreversible changes. boiling point changes. chemical changes. physical changes. 3.what does the release or absorption of energy indicate? chemical change neither physical nor chemical changes physical change physical and chemical changes

Step-by-step answer

P Answered by Master

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The explanations are mentionned in the attached file.

1. The right answer is physical changes.

2. The right answer is chemical changes.

3. The right answer is chemical change.

4. The right answer is fireworks exploding.

5. The right answer is All of the above.

6. The right answer is combining oxygen gas and hydrogen gas to form liquid water.

7. The right answer is gas is produced.

8. The right answer is The compound may or may not be poisonous, depending on the chemical properties of the new substance.

9. The right answer is This is a physical change, because the two substances were separated physically by boiling.

10. The right answer is C. The tablet that was placed in the water interacted ... chemical change.

11. The right answer is B. Energy is either released or absorbed.

12. The right answer is that we should compare both physical and chemical properties of these two substances : if they have the same properties, it means that it is the same substance, if not, they are different substances.

13. The right answer is A. Flammability.

14. The right answer is Column.

15. The right answers are Melting point, conductivity, solubility, malleability, density.

16. The right answer is oxidation, flammability, combustibility.

17. The right answer is A. Arrangement of protons in the nucleus.

Biology

1.changes to a substance that do not involve a permanent reordering of atoms are know as physical changes. endothermic changes. irreversible changes. chemical changes. 2.changes that reorder atoms to form new molecules, such as the reaction between sodium and chlorine ions to form sodium chloride, are known as irreversible changes. boiling point changes. chemical changes. physical changes. 3.what does the release or absorption of energy indicate? chemical change neither physical nor chemical changes physical change physical and chemical changes

Step-by-step answer

P Answered by Master

14

The explanations are mentionned in the attached file.

1. The right answer is physical changes.

2. The right answer is chemical changes.

3. The right answer is chemical change.

4. The right answer is fireworks exploding.

5. The right answer is All of the above.

6. The right answer is combining oxygen gas and hydrogen gas to form liquid water.

7. The right answer is gas is produced.

8. The right answer is The compound may or may not be poisonous, depending on the chemical properties of the new substance.

9. The right answer is This is a physical change, because the two substances were separated physically by boiling.

10. The right answer is C. The tablet that was placed in the water interacted ... chemical change.

11. The right answer is B. Energy is either released or absorbed.

12. The right answer is that we should compare both physical and chemical properties of these two substances : if they have the same properties, it means that it is the same substance, if not, they are different substances.

13. The right answer is A. Flammability.

14. The right answer is Column.

15. The right answers are Melting point, conductivity, solubility, malleability, density.

16. The right answer is oxidation, flammability, combustibility.

17. The right answer is A. Arrangement of protons in the nucleus.

Chemistry

What elements combined with Strontium, St, in a 1:1 ratio?

Step-by-step answer

P Answered by PhD

Answer: chalcogens.
Explanation: Strontium is an alkaline earth metal, it always exhibits a degree of oxidation in its compounds +2.
Chalcogens are a group of 6 chemical elements (oxygen O, sulfur S, selenium se, tellurium te, polonium Po) that have an oxidation state of -2 => Chalcogens will combine with strontium in a ratio of 1:1.

Chemistry

Fiona claims that the diagram below shows simple machines, but Chad claims that it shows a compound machine. A man pushes a shopping cart up a ramp. Which statement best explains who is correct? Fiona is correct because less than three machines are shown in the diagram. Fiona is correct because the diagram shows two individual simple machines. Chad is correct because more than one machine is shown in the diagram. Chad is correct because the diagram shows two simple machines doing a job.

Step-by-step answer

P Answered by Specialist

Answer: b. Fiona is correct because the diagram shows two individual simple machines.

Explanation:
A mechanical device using which we can change the direction or magnitude of force applied is known as simple machine.
For example, in the given diagram there are two individual simple machines.
The machine helps in changing the direction or magnitude of force applied by the man. As a result, it becomes easy for him to carry different things easily from one place to another.
Thus, we can conclude that the statement Fiona is correct because the diagram shows two individual simple machines, is correct.
Answer: b. Fiona is correct because the diagram shows two individual simple machines.

Explanation

Answer: b. Fiona is correct because the diagram shows two individual simple machines.

Explanation

Chemistry

Based on the equation, how many grams of Br2 are required to react completely with 29.2 grams of AlCl3 (5 points)? 2AlCl3 + 3Br2 → 2AlBr3 + 3Cl2

Step-by-step answer

P Answered by PhD

1

Answer:

52.6 gram

Step-by-step explanation:

It is clear by the equation 2(27+3×35.5)= 267 gm of AlCl3 reacts with 6× 80 = 480 gm of Br2 . So 29.2 gm reacts = 480× 29.2/267= 52.6 gm

Chemistry

The reaction of 15 moles carbon with 30 moles O2. Will result in a theoretical yield of_ moles CO2.

Step-by-step answer

P Answered by PhD

15 moles.Explanation:Hello,In this case, the undergoing chemical reaction is:Clearly, since carbon and oxygen are in a 1:1 molar ratio, 15 moles of carbon will completely react with 15 moles of oxygen, therefore 15 moles of oxygen remain as leftovers. In such a way, since carbon and carbon dioxide are also in a 1:1 molar ratio, the theoretical yield of carbon dioxide is 15 moles based on the stoichiometry:Best regards.

Chemistry

carbon 14 has a half life of 5730 years how much carbon 14 will remain in a 100 g sample after 11460 years

Step-by-step answer

P Answered by PhD

Answer: 25 g
Explanation: Given:
Original amount (N₀) = 100 g
Number of half-lives (n) = 11460/5730 = 2
Amount remaining (N) = ?
N = 1/2ⁿ × N₀
N = 1/2^2 × 100
N = 0.25 × 100
N = 25 g

Chemistry

The half life of radium 226 is 1602 years. If you have 500 grams of radium today how many grams would have been present 9612 years ago?

Step-by-step answer

P Answered by PhD

Answer: 7.8125 g
Explanation: Given:
Original amount (N₀) = 500 g
Number of half-lives (n) = 9612/1602 = 6
Amount remaining (N) = ?
N = 1/2ⁿ × N₀
N = 1/2^6 × 500
N = 0.015625 × 500
N = 7.8125 g

Chemistry

A magnesium chloride solution reacts with potassium phosphate solution to form a white precipitate.knowing that virtually all potassium compounds are soluble they dissolve in water,write the balanced equation for this reaction.include all subscripts

Step-by-step answer

P Answered by PhD

Answer: The product formed is potassium chloride.
Explanation:
Precipitation reaction is defined as the chemical reaction in which an insoluble salt is formed when two solutions are mixed containing soluble substances. The insoluble salt settles down at the bottom of the reaction mixture.

The chemical equation for the reaction of potassium phosphate and magnesium chloride follows (look at the picture)

2 moles of aqueous solution of potassium phosphate reacts with 3 moles of aqueous solution of magnesium chloride to produce 1 mole of solid magnesium phosphate and 6 moles of aqueous solution of potassium chloride.
Answer: The product formed is potassium chloride.
Explanation:
Precipitation reaction is defined a

Answer: The product formed is potassium chloride.
Explanation:
Precipitation reaction is defined a

Chemistry

Chemistry, 29.01.2021 19:10 Lovely7290 Which chemical name and formula are correct A. Diarsenic pentoxide, A5O5 B. carbon tetrachloride, CCI4 C. Sodium dichromate, Na2Cr2 D. magnesium phosphide, MgP please help

Step-by-step answer

P Answered by PhD

Answer: B. carbon tetrachloride, CCI4
Explanation: The other options are incorrect. Let's write the correct formulas:
A. Diarsenic pentoxide - As2O5
C. Sodium dichromate - Na2Cr2O7
D. magnesium phosphide - Mg3P2

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