What is an endothermic reaction?

Answers

Answer 1

Answer:

Endothermic reactions are reactions that take in energy. This is usually in the form of heat. An example could be evaporation because heat is being absorbed by water and molecules are moving away from each other.

Answer 2

Answer: A reaction where energy is taken in from the surroundings causing temperature to decrease. Bond breaking requires energy and bond making releases energy. Therefore, if energy is taken in from the environment then in that reaction, more bonds are broken than formed. e.g. melting an ice cube.

Related Questions

How do three states of matter arise?
What category of elements does krypton gas belong to?A. metals B. metalloids C. non-metals
What type of reaction is CH 4 (g)+2O 2 (g) CO 2 (g)+2H 2 O(g)
A compound has a molar mass of 90 grams per mole and the empirical formula CH2O. What is the molecular formula of this compound?
PLEASE HELPPPPP Antimony exists naturally as 2 isotopes. Antimony-121 has a mass of 120.9038 amu and an abundance of 57.30%. Determine the mass of the other isotope, antimony-123 knowing the average atomic mass of the element is 121.80 amu.

Andy is waiting at the signal. As soon as the light turns green, he accelerates his car at a uniform rate of 8.00 meters/second2. What is the displacement of Andy’s car after 30.0 seconds?

Answers

Answer:

7200 m

Explanation:

This problem is an example of an uniformly accelerated motion, in which the acceleration remains constant. As such, the formula for the displacement is:

D(t) = D₀ + v₀*t + 0.5*a*t²

Where D₀ is the initial displacement, v₀ is the initial velocity (in this case it's 0 m/s), a is the aceleration (8 m/s²) and t is the time, in seconds.

Using a t=30.0 s, we're left with:

D(t) = 0 m + 0 m/s * 30.0 s + 0.5 * 8.00 m/s² * (30.0 s)²

D(t) = 0.5 * 8.00 m/s² * (30.0 s)²

D(t) = 7200 m

1200 m/s squared, assuming the initial velocity is 0.

A yellow luminous flame is produced when an insufficient amount of oxygen is supplied. This flame should not be used when heating because it will coat glassware with black soot. What element is this made from? Answer with the correct elemental symbol. It will be case sensitive.

Answers

Soot is created when burning happens incompletely, because there was an insufficient amount of oxygen supplied. As soot is made from carbon particles, the chemical symbol will be C, for carbon.

How does the suns energy contribute to the movement of water in the water cycle?

Answers

Answer:

The sun is what makes the water cycle work. ... Heat causes liquid and frozen water to evaporate into water vapor gas, which rises high in the sky to form clouds... clouds that move over the globe and drop rain and snow. This process is a large part of the water cycle.

Explanation:

Answer it doesn't contribute

Explanation: it doesn't contribute

A thermometer is in a beaker of water. Which statement best explains why the thermometer reading initially increases when LiBr(s) is dissolved in the water?(1) The entropy of the LiBr(aq) is greater than the entropy of the water.
(2) The entropy of the LiBr(aq) is less than the entropy of the water.
(3) The dissolving of the LiBr(s) in water is an endothermic process.
(4) The dissolving of the LiBr(s) in water is an exothermic process.

Answers

The statement best explains why the thermometer reading initially increases when LiBr(s) is dissolved in the water is the dissolving of the LiBr(s) in water is an exothermic process.

What is a thermometer?

A thermometer is an instrument that is used to measure the temperature of an object.

An exothermic process is in which the heat and energy is released in the outer system.

Thus, the correct option is (4) The dissolving of the LiBr(s) in water is an exothermic process.

Learn more about thermometer

brainly.com/question/24189042

#SPJ2

(4) The dissolving of the LiBr(s) in water is an exothermic process

The atoms in a sample of an element are in excited states. A bright-line spectrum is produced when these atoms A. absorb energy B. absorb positrons C. emit energy D. emit positrons

Answers

The correct answer is C. To produce a bright-line spectrum, atoms will need to give off energy to then show this light. Emit means to give something off externally, so the answer is emit energy. A is incorrect because absorbing energy would be the opposite of C, because the atoms would be taking in rather than giving off light. Also, light is a form of energy, not a positron (which has the same mass as an electron but with a positive charge), making both B and D incorrect.

A bright-line spectrum is produced when the atoms in a sample of an element $\boxed{{\text{C}}{\text{. emit energy}}}$ .

Further explanation:

Atomic electronic transition:

When an atom jumps from one energy level to another energy level, an atomic electronic transition is said to take place. This occurs either due to the absorption or emission of energy by the electron.

When the transition of an atom takes place from lower to higher energy levels by the absorption of energy, it is known as an absorption process. But when atom jumps from higher to lower energy level, it releases or emits energy and therefore the process is called an emission process.

The lowest energy state of an atom is called the ground state and its energy is known as zero-point energy. It is the most stable energy level of an atom. But the state that has energy higher than that of the ground state is called an excited state. Excited states are unstable as compared to the ground state and atoms in such states tend to lose energy and jump back to the lower energy levels.

Since the atom of the sample bright-line present in the excited states, a bright-line spectrum is observed only if it emits some amount of energy and comes back to the lower energy level.

Learn more:

Component of John Dalton’s atomic theory: brainly.com/question/2357175
Basis of investigation for the scientists: brainly.com/question/158048

Answer details:

Grade: Senior School

Chapter: Atomic structure

Subject: Chemistry

Keywords: transition, ground state, excited state, energy, absorption, emission.

What are the components needed in order for an experiment to be valid? Identify these components in the following experiment: A scientist is testing a new plant food to see if it causes plants to grow faster. The scientist tests two plants with the new plant food, and two plants he grows without plant food.

Answers

He is missing a (real) control. Growing two plants without plant food at all doesn't count; in order to see if the new food is better, he must also grow plants with the original food in order to compare it.

He does have an independent variable. This is the type of plant food. It's independent because he has direct control over it.

He needs to give plants the same conditions besides food: same water (amount), same light exposure, same temperature, etc.

He needs to choose a quantitative way to measure how much the plants grew, like mass or length.

Other Questions

What do you call the amount of water vapor in the air?

How many different sets of equivalent protons are there for para-xylene (1,4-dimethylbenzene)? only 1 two three four?

Bromothymol blue is an indicator that turns yellow in solutions when the ph is below 6, green when the ph is between 6 and 8, and blue when the ph is above 8. what color would it turn when added to water? a. yellow b. green c. blue d. pink

Find the [H+] in an acetic acid solution that has a pH of 5.12