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3 years ago

how many joules of heat are absorbed to raise the temperature of 435 grams of water at 1 atm from 25c to its boiling point 100c

Chemistry

1 answer:

Rasek [7]3 years ago

4 0

It is 4.18 joules pr gram

Q=435* 4.18* (100-25)
Q=136.4kj

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\The specific heat of aluminum is 0.21 cal g°C . How much heat is released when a 10 gram piece of aluminum foil is taken out of

DiKsa [7]

Answer: The amount of heat released is 84 calories.

Explanation:

The equation used to calculate the amount of heat released or absorbed, we use the equation:

$Q= m\times c\times \Delta T$

where,

Q = heat gained or released = ? Cal

m = mass of the substance = 10g

c = specific heat of aluminium = 0.21 Cal/g ° C

Putting values in above equation, we get:

$\Delta T={\text{Change in temperature}}=(10-50)^oC=-40^oC$

$Q=10g\times 0.21Cal/g^oC\times-40^oC$

Q = -84 Calories

Hence, the amount of heat released is 84 calories.

6 0

3 years ago

What is the pH of a 1.0 molar solution of HCl?

satela [25.4K]

Answer:

Explanation:

For 1.0 M HCl:

[H⁺] = 1.0 M.

∵ pH = - log[H⁺]

∴ pH = - log(1.0 M) = 0.

4 0

4 years ago

A solution in which the [H+] is greater than [OH-] is called

Vlad1618 [11]

Answer: Acidic Solution

Explanation:

An acidic solution is one that has more hydrogen ion (H+) than OH - concentration.

4 0

4 years ago

Nio conducts a science experiment. He puts yeast into a bottle with water and sugar, and then caps the bottle with a balloon. He

skad [1K]

Answer:the answer is a chemical change, because a gas was produced

Explanation: yeast is a chemical

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4 years ago

What is meant by the term chemical reaction

pantera1 [17]

Answer:

<h3> $\huge{ \underline{ \underline { \bold{ \sf{ \orange{See \: below}}}}}}$ </h3>

Explanation:

▪️ $\underline{ \bold{ \sf{ \blue{Chemical \: reaction}}}}$

⇒The composition , decomposition or displacement of molecules of matter during chemical change is called chemical reaction.

▪️ $\underline{ \bold{ \sf{ \purple{ \: Further \: more \: explanation}}}}$

Various conditions bring about these changes. The chemical reactions are represented by chemicalequation. The compounds or elements that take part in chemical reaction are called reactant. They are written at the left side of an arrow that represent a change while the compound or elements that formed after the chemical change are called product. They are written at the right side of the arrow.

▪️ $\underline{ \bold{ \sf{ \purple{For \: example}}}}$

When nitrogen reacts with hydrogen to form ammonia :

Nitrogen + Hydrogen ⇒ Ammonia

N₂ + 3H₂ ⇒ 2NH₃

Presentation of a chemical reaction in the form of equation is called chemical equation . Chemical equation may be word equations or formula equations.

Hope I helped!

Best regards!!

3 0

3 years ago