CHEMISTRY HIGH SCHOOL

Classify the following change as physical or chemical: A match lights when struck.A. Physical change
B. Chemical change

Answers

Answer 1
Answer: I think the answer is:
B. Chemical Change.

Related Questions

Explain why a model of the atom is crucial to understanding chemistry and in explaining the behavior of matter. Use 3 - 4 sentences in your explanation.
Which of the following is not required in a chemical reaction?a. atomic nuclei c. products b. reactants d. energy
Imagine that you have a metal bar sitting half in the sun and half in the dark. On a sunny day, the part of the metal that has been sitting in the sun feels hot. If you touch the part of the metal bar that has been sitting in the dark, will it feel hot or cold? Justify your answer in terms of thermal conductivity.
What gas is removed from inhaled air
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The process of chemical cycling is known as a biogeochemical cycle. Why was it called biogeochemical cycle? A. absorbs the chemical involved from the sediment. B. takes place over a long period of time. C. involves both living and nonliving components. D. withdraws the chemical from the atmosphere as a gas.

Answers

I think the correct answer from the choices listed above is option C. Biogeochemical cycle is termed as such because these cycles  involves both living and nonliving components. These cycles are the carbon cycle, water cycle, nitrogen cycle, phosphorus cycle, oxygen cycle, sulfur cycle and rock cycle.

Which of the following characteristics is not a property of an acid? Has a sour taste Accepts an H+ ion in reaction May cause damage to buildings, statues, and rivers Increases the concentration of hydronium ions in an aqueous solution

Answers

Answer : Option B) Accepts an H+ ion in reaction


Explanation : Acid is a lewis acid which forms a bond by accepting a pair of electrons. Acids, when dissolved increase the concentration of hydronium ion in the solution. So, the statement which is Acid accepts H+ ion is irrelevant here, as base accepts the H+ ion in a reaction.

Answer : The incorrect option is, Accepts an H⁺ ion in reaction.

Explanation :

Acid : It is a type of species which contains hydrogen ion.

Properties of an acid :

The taste of an acid is sour.

An acid does not feel slippery.

Acid reacts with the active metal to form a gas and a salt.

It change the color of litmus paper to red or pink.

It conduct electricity.

It react with carbonates to give salt.

It react with a metal to give compound and hydrogen gas.

Base : It is a type of species which contains hydroxide ion.

Properties of an base :

The taste of base is bitter.

The base feels slippery.

It does not react with the active metal.

It change the color of litmus paper to blue.

It conduct electricity.

As per question, all options are the properties of an acid while the statement accepts an H⁺ ion in reaction is in the property of an acid because it donates hydrogen ion in the solution.

Hence, the incorrect option is, Accepts an H⁺ ion in reaction.

Consider the following reaction to generate hydrogen gas: Zn(s) + 2 HCl(aq) → ZnCl2(aq) + H2(g) The hydrogen gas is collected by displacement of water at 35.0 °C at a total pressure of 745 torr. The vapor pressure of water at 35.0 °C is 42 torr. Calculate the partial pressure of H2 (in atm) if 353.2 mL of gas is collected over water from this method.

Answers

Answer:

0.925 atm

Explanation:

By Dalton's Law, the total pressure of a gas mixture is the sum of the partial pressure of its components. The vapor pressure of the water is the pressure that some molecules that evaporated do under the liquid surface. The gas and the liquid are at equilibrium. So, the gas mixture is water vapor and hydrogen gas.

Ptotal = Pwater + PH₂

745 = 42 + PH₂

PH₂ = 703 torr

Transforming to atm:

1 atm ------------------760 torr

x ------------------ 703 torr

By a simple direct three rule

760x = 703

x = 0.925 atm

Structurally, what is the difference between the dermis and the epidermis?A. the dermis contains more types of tissue.
B. the epidermis consists of mostly adipose cells.
C. the epidermis is thicker.
D. the dermis is made of mostly dead cells

Answers

A is the right answer

there are 2parts of epidermis in a leaf upper epidermis and epidermis is the lower

What is the balanced equation of Ca3(PO4)2+ SiO+ C---> P+ CaSiO+ CO

Answers

Balanced chemical equation:

1 Ca3(PO4)2 + 3 SiO2 + 11 C = 2 P + 3 CaSiO + 11 CO

hope this helps!.

As carbon dioxide sublimes, its entropy
(1) decreases (2) increases (3) remains the same

Answers

Answer: (2) increases

Explanation: Entropy is the measure of randomness or disorder of a system. More is the random arrangement of molecules in a system , more is the entropy of the system. More ordered is the arrangement of molecules in a system, less is the entropy of the system.

When carbon dioxide sublimes, it means solid carbon dioxide is directly changing to gaseous state without undergoing into liquid state, thus the molecules will be more random and thus the entropy will increase.
When something sublimes (Goes straight from solid to gas), it takes in energy, as it is an endothermic process, so its entropy increases
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