CHEMISTRY MIDDLE SCHOOL

How do you know if a reaction is endothermic?

Answers

Answer 1
Answer: If you see the heat on the reactants side this means that the heat is being added to the system and is an endothermic reaction.

Related Questions

HIGH SCHOOL

A person is standing on ice. He throws a snowball with a force of 4 N to the right, while the snowball pushes the person with a force of 4 N to the left. What is the net force on the person? 0 N
8 N
4 N, right
4 N, left

Answers

In my point of view,
if two different forces act on two different directions the net force acting is the difference between them
So,4n-4n=0n

Answer:

Net force on the person is 0 N.

Explanation:

It is given that, a person is standing on ice. He throws a snowball with a force of 4 N to the right, while the snowball pushes the person with a force of 4 N to the left.

The given scenario is balanced because the same amount of force is acting in both direction.

Net force,

Where

are forces in right side and left side respectively.

This gives,

So, the net force acting on the person is 0 N. Hence, the correct option is (a).

COLLEGE

The following data were obtained from experiments to find the molecular formula of procaine, a local anesthetic, which contains only carbon, hydrogen, nitrogen, and oxygen. Complete combustion of a 3.54g sample of procaine with excess O2 formed 8.58 g of CO2 and 2.70 g H2O. Another sample of mass 2.35 g was found to contain 0.279 g of N. The molar mass of procaine was found to be 236.Find the molar formula of procaine

Answers

All you really need to know is that H20 is water end of story
HIGH SCHOOL

When 3-iodo-3-ethylpentane is treated with sodium methoxide in methanol, the major organic product is an ______ that is generated through an ______ mechanism. A) ether, SN1
B) ether, SN2
C) ether, E1
D) alkene, E2
E) alkene, E1

Answers

Answer:

E

Explanation:

The alkyl halide is a tertiary alkyl halide and the methoxide base is a strong base. Owing to steric effects, tertiary alkyl halides often undergo elimination instead of substitution reaction with strong bases. The elimination occurs via an E1 mechanism because the tertiary carbocation formed is stable.

MIDDLE SCHOOL

What is this element 1s22s22p6?

Answers

If you add them up: 2+2+6 = 10, you will know it's Neon, which is written as Ne
HIGH SCHOOL

List three common types of products produced by reactions that occur in aqueous solutions.

Answers

Aqueous solution are solutions in which the solvent is water, usually shown as (aq) in a chemical equation. For example a solution of potassium chloride (KCl), in water it should be represented as Na +(aq) + Cl- (aq). Reactions that occurs in aqueous solution may produce three types of product namely;  A precipitate , gases or heat could be released or absorbed
MIDDLE SCHOOL

Under what condition will the results of an experiment based on a hypothesis most likely lead to new experimentation?

Answers

If the experiment is not performed right,you can redo the experiment.

Answer:when the results do not match the department's prediction

Explanation:if they match, it wouldn't make sense to try to disprove oneself not existing theory.

HIGH SCHOOL

A newly discovered unicellular organism isolated from acidic mine drainage is found to contain a cell wall, a plasma membrane, two flagella, and peroxisomes. Based just on this information, the organism is most likely ________. A. a motile archaea B. a nonmotile eukaryote C. a motile bacterium D. a motile eukaryote

Answers

Based on this information, we can say that the organism is most likely to be  D. a motile eukaryote

What do eukaryotes use for motility?

Cilia and flagella are among the most ancient cellular organelles, providing motility for primitive eukaryotic cells living in an aqueous environment.

Are prokaryotes motile?

Prokaryotic cells move via wet surfaces or liquids over by swimming, swarming, or floating. An amazing diversity of motility mechanisms has evolved in prokaryotes. Movement can involve surface appendages, such as flagella that spin, pili that pull, and Mycoplasma 'legs' that walk.

Learn more about eukaryote here

brainly.com/question/495097

#SPJ2

Answer:

The answer to your question is: letter D

Explanation:

A. a motile archaea Archea don't have peroxisomes then this option is wrong.

B. a nonmotile eukaryote The new organism has flagella then it can move, so this option is wrong.

C. a motile bacterium Bacterium don't have peroxisomes so this option is wrong.

D. a motile eukaryote This is the correct option because an eukaryote can have all the characteristics described.

COLLEGE

Using the values that were recorded, answer the questions. A) Find the energy value for the single ethanol molecule. This is the enthalpy of formation ( Δ H f ) . Double this energy to determine the energy of two isolated ethanol molecules. Substract this value from the energy value for the two ethanol molecules with hydrogen bonding. Convert this result to kilojoules per mole (see Hint).

Answers

Answer:

-5.318213 x 10

Negative, exothermic

Explanation:

If you did the Spartan assignment, you'll have energy values for one ethanol molecules and two. For the first ethanol, double it. This is what you're going to subtract from the energy found from two ethanol molecules. Your answer should be negative. Because the enthalpy of formation is negative, that means heat is lost (exerted) and therefore exothermic.

MIDDLE SCHOOL

Julia wants to find out which color fabric will heat up the fastest when put under a direct light. So, she places pieces of red, white, and green fabrics outside in the sunlight. Then, she places pieces of black, yellow, and blue fabric inside under a bright lamp. Finally, she measures the temperature of all the fabric samples every 5 minutes.

Will Julia's results be valid?

Answers

Answer:

no to many variables

Explanation:

NO the answers wont be valid.
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