Match the description to the correct term. If the description matches both terms, use
"both" for your answer.

Cause(s) the temperature of
the surroundings to
decrease.

Cause(s) a change in the
temperature of the
surroundings.

Cracking open a cold-pack.
Burning Wood

Absorb(s) energy from the
surroundings.

Cause(s) the temperature of
the surroundings to increase.

Release(s) energy to the
surroundings.

1. Endothermic reaction
2. Exothermic reaction
3. Both

Answers

Answer 1

Answer:

Cause(s) the temperature of the surroundings to decrease. - 1. Endothermic reaction.

Cause(s) a change in the temperature of the surroundings. - 3. Both.

Cracking open a cold-pack. - 1. Endothermic reaction.

Burning Wood. - 2. Exothermic reaction.

Absorb(s) energy from the surroundings. - 1. Endothermic reaction.

Cause(s) the temperature of the surroundings to increase. - 2. Exothermic reaction.

Release(s) energy to the surroundings. - 2. Exothermic reaction.


Related Questions

The three most common phases of matter are

Answers

Answer:

Solid, Liquid, and Gas

Explanation:

There are constantly these three phases of matter around us every day. The water you drink is a liquid, the chair you sit on is a solid, and the air you breathe is a gas.

Rice has a bulk density of 0.9 g/mL, but an individual grain of rice has a
density of 1.1 g/mL. Water has a density of 1.0 g/mL. What would happen to
a cup of rice when poured into a pot of water?

Answers

Answer:

Individual grain of rice will sink.

Explanation:

Given:

Rice bulk density = 0.9 g/ml,

Individual grain of rice density = 1.1 g/ml

Water density = 1.0 g/ml

Find:

What happens with a cup of rice when poured into water =?

Explanation:

Each piece of grains of rice will sink into the water because individual grains of rice has a higher density than water.

The conversation of cyclopropane to propene in the gas phase is a first order reaction with a rate constant of 6.7x10-⁴s-¹. a) if the initial concentration of cyclopropane was 0.25M , what is the concentration after 8.8min?b) how long (in min) will it take for the concentration of cyclopropane to decrease from 0.25M to 0.15M?

Answers

Answer: a)  The concentration after 8.8min is 0.17 M

b) Time taken for the concentration of cyclopropane to decrease from 0.25M to 0.15M is 687 seconds.

Explanation:

Expression for rate law for first order kinetics is given by:

[tex]t=\frac{2.303}{k}\log\frac{a}{a-x}[/tex]

where,

k = rate constant

t = age of sample

a = let initial amount of the reactant

a - x = amount left after decay process  

a) concentration after 8.8 min:

[tex]8.8\times 60s=\frac{2.303}{6.7\times 10^{-4}s^{-1}}\log\frac{0.25}{a-x}[/tex]

[tex]\log\frac{0.25}{a-x}=0.15[/tex]

[tex]\frac{0.25}{a-x}=1.41[/tex]

[tex](a-x)=0.17M[/tex]

b) for concentration to decrease from 0.25M to 0.15M

[tex]t=\frac{2.303}{6.7\times 10^{-4}s^{-1}}\log\frac{0.25}{0.15}\\\\t=\frac{2.303}{6.7\times 10^{-4}s^{-1}}\times 0.20[/tex]

[tex]t=687s[/tex]

The government described in the passage most reflects the features of which type of democracy? No

Answers

The correct answer is B. Direct democracy

Explanation:

In a direct democracy, the citizens have a direct influence on government including laws, this means political decisions are made based on the opinion of citizens. This form of government differs from indirect democracy because in indirect democracy citizens only vote to choose representatives but do not participate directly in each political decision. The example presented is an example of direct democracy because even if some are not considered citizens, those who have the quality of "citizens" directly participate in the political decisions.

A student is trying to dissolve 20 grams of sugar in a beaker containing 250 milliliters of water at room temperature. What can the student do to make the sugar dissolve faster in the water? a. decrease the temperature of the water b.use larger pieces c.stir rapidly d.use less water

Answers

Answer:

C. Stir rapidly

hi:) why do acids produce hydrogen ions in aqueous solution?

Answers

Answer:

An acid produces hydrogen ions in aqueous solution because it reacts with the water molecules by giving a proton to them.

Explanation:

When hydrogen chloride gas dissolves in water to produce hydrochloric acid, the hydrogen chloride molecule gives a proton (a hydrogen ion) to a water molecule.

Answer:

Acids produce hydrogen ions in aqueous solution because they have a higher concentration of hydrogen ions than hydroxyl ions and that's the reason too why they have a lower pH.

Hope this helps.

When there is unequal sharing between two atoms of the electrons in a bond, which
type of bond is it?

Answers

Answer:

polar covalent bond

Explanation:

Where do you think trees get the nutrients they need to grow?
I​

Answers

The answer is the sun and water

Balance the following chemical
equation by providing the correct
coefficients.
_FeBr3 +_Na2S -> _Fe2S3 + _NaBr

Answers

Answer:

2FeBr3 + 3Na2S ➡️ Fe2S3 + 6NaBr

9. What is the difference between physical weathering and chemical weathering?​

Answers

Rocks breaking apart wihout changing their chemical composition & and basically the other is an erosion

Explaination :

Answer: Physical Weathering physically breaks the rock, while Chemical Weathering chemically changes the rock causing it to break.

Explanation: Physical Weathering happens naturally causing the rock to break. An example is roots growing into the concrete causing it to crack. Chemical Weathering on the other hand chemically changes the rock by a chemical reaction. An example is acid rain. Gas or other pollution mixing in with water causing acid rain.

hope this helps ;)

why is the renewable energy resource you chose is negative?

Answers

Answer:

There’s a high need for energy storage and are very expensive. Renewable energy is also not always available because some need sun while others need wind.

Explanation:

what happens to the zebra molecules once they are eaten by the cheetah?

Answers

Answer:

All living organisms need food for their body metabolism. Food helps in the provision of basic nutrients for the body’s survival and growth.

When the Cheetah eats the Zebra, enzymes acts on the Zebra molecules and converts it into smaller molecules.

The smaller molecules broken down are then readily absorbed and used by the cells of the Cheetah.

An electron is in a region outside the nucleus. An electron
a) Is larger than a proton and has no charge
b) Has less mass than a proton and has a negative charge
c) Is smaller than a proton and has no charge
d) Has a positive charge

Answers

Answer:

b

Explanation:

electrons lie in the orbits of the atom. they are negatively charged and they are very small in size. they have very less mass than proton. ele tron has 1/1840 mass of proton.

Steel:
Propane:
Calcium chloride:
Water:

Answers

what is the question

Answer:

Steel is a metallic bond

Propane is a covalent bond

Calcium Chloride is an Ionic Bond

Water is a covalent bond

Explanation:

ence a material's properties, identify each of the , ionic, covalent, or metallic bonds

Ionic Bonds are where the extra outer electron of one atom transfers to the other atom.

Covalent Bonds are where the outer electron of one atom takes the open path to the nucleus (negative valance) of a 2nd atom.

Metallic Bonds are formed from the attraction between free electrons and fixed positively charged metallic atoms. Metallic bonds extend over the entire molecular structure.

Substance                  Properties

Steel                           Conducts electricity as solid and liquid

Propane                      Low melting point

Calcium Chloride       Conducts electricity when dissolved in water

Water                          Solid form is brittle, melts at 0C

Steel is an alloy of carbon, iron and other things

Propane = C3H8 C4- H+

Calcium Chloride  = CaCl2 = Ca2+ Cl-

Water = H2O = OH- and H+

what are two factors about particles that enable them to form solutions (SCIENCE)

Answers

Answer:

temperature and whether or not they are polar or non-polar.

is Naci a metal or none metel

Answers

Answer:

Salt (NaCl) is an ionic bond that consists of Sodium (Na) which is a metal with positive charge combines with Chlorine (Cl), a nonmetal with a negative charge.

Explanation:

Write a word equation and symbol equation (including state symbols)
for the reaction of calcium chloride with sodium hydroxide

Answers

Answer:

Explanation:

Calcium chloride reacts with NaOH to produce the Calcium hydroxide

CaCl2 + 2NaOH   ----> 2NaCl + Ca(OH)2

Which of these is an example of interactions between the atmosphere and hydrosphere? (3 points) formation of snow cracking of rocks due to heat destruction of houses by wind uprooting of trees during tornadoes

Answers

Answer:

A. formation of snow

Explanation:

The formation of snow is an example of interactions between the atmosphere and hydrosphere.

As snow formation takes place when water vapor converted into liquid through condensation in the clouds. As water droplets rises high in clouds, cooler air present in atmosphere allow to lower the temperature and water droplets form ice or snow.

Hence, the correct option is A.

Answer:

A:formation of snow

Explanation:

At what temperature does the solid start meltin
-20°C
0°C
20"
80°C

Answers

Answer:

0 C.

Explanation:

Which value gives the number of particles in 1 mol of a substance?
6.02 x 1021
6.02 x 1022
6.02 x 1023
6.02 x 1024

Answers

Answer: it's C 6.02×10²³

Explanation:

I got it right in edge

Which of following is the most accurate description of a piston in an internal-
combustion engine?
A shaft that converts the up-and-down motion into a rotary motion
A plug that protrudes through the cylinder head and makes sparks that ignite the
air-and-fuel mixture
A can-shaped component that moves smoothly up and down and is the main
moving part
O A hollow metal tube drilled into the solid metal engine block

Answers

Answer:

A can-shaped component that moves smoothly up and down and is the main moving part

Explanation:

I chose the other answer that other person listed but got it wrong. This instead is the correct answer

Answer:

C.  A can-shaped component that moves smoothly up and down and is the main

moving part

Explanation:

The piston is a can-shaped component that can move smoothly up and down inside the cylinder; it moves up to compress the air-and-fuel mixture and is pushed down when the spark plug ignites the mixture, which causes an explosion.

For the reaction NH4Cl (s)→NH3 (g)  + HCl (g) at 25°C, ΔH = 176 kJ/moland ΔS = 0.285 kJ/(mol - K).

What is the ΔG, and will this reaction be spontaneous in the forward direction?

169 kJ/mol; no

-91 kJ/mol; yes

91 kJ/mol; no

91 kJ/mol; yes

Answers

Answer:

C: 91 kJ/mol; no

Explanation:

Just took the quiz! :)

The ΔG is 91kJ/mol and the reaction is not spontaneous in the forward direction and the correct option is option 3.

What is Gibbs free energy change?

Gibbs free energy, also known as the Gibbs function, Gibbs energy, or free enthalpy, is a quantity that is used to measure the maximum amount of work done in a thermodynamic system when the temperature and pressure are kept constant.

The Gibbs free energy of the system is a state function because it is defined in terms of thermodynamic properties that are state functions.

The change in the Gibbs free energy of the system that occurs during a reaction is therefore equal to the change in the enthalpy of the system minus the change in the product of the temperature times the entropy of the system.

                                             ΔG = ΔH - TΔS

Given,

ΔH = 176kJ/mol

ΔS = 0.285kJ/mol K

T = 25⁰C = 273 + 25 = 298K

ΔG = ΔH - TΔS

ΔG = 176000 - 298 × 285

= 91070 = 91 kJ/mol

Since ΔG is positive, the reaction is not spontaneous in the forward direction.

Therefore, the ΔG is 91kJ/mol and the reaction is not spontaneous in the forward direction and the correct option is option 3.

Learn more about Gibbs free energy change, here:

https://brainly.com/question/4002787

#SPJ3

Mantle material rises in convection currents because heated materials become more dense.

True Or False

Answers

Answer:

True

Explanation:

What’s one renewable energy resource that can be used instead of fossil fuels ?

Answers

Answer:

Solar Energy & Wind Energy

Explanation:

These are renewable energy and can be used used in replacement for fossil fuels.

PLS MARK ME AS BRAINLIEST!!

A beaker contains 41.3 mL of pentane ( C5H12 , density is 0.626 g/mL). Determine how many C atoms this liquid contains.

Answers

Answer:

41.3 mL OF PENTANE CONTAINS 62.608 *10^-27 CARBON ATOMS.

Explanation:

Volume of Pentane = 41.3 mL

Density = 0.626 g/mL

Since density is defined as mass per unit volume. Calculate the mass:

Density = mass / volume

Mass = density * volume

Mass = 0.626 g/mL * 41.3 mL

Mass = 0.015 g of pentane

Molar mass of pentane C5H12 = ( 12* 5 + 1*12) = 60 + 12 = 72 g/mol

Number of moles = mass / molar mass

Number of moles = 0.015 g / 72 g/mol

Number of moles = 2.08 * 10^-4 moles.

Since 1 mole of pentane contains 5 moles of carbon, we can then calculate how many moles of csrbon 2.08*10^-4 moles will contain

1 mole of pentane = 5 moles of carbon

2.08 *10^-4 moles = x moles

x mole = 5 * 2.08*10^-4

x mole = 10.4 *10^-4 moles of carbon

In other words, 10.4*10^-4 moles of carbon is present in 41.3 mL of pentane

We can then calculate the number of carbon atoms present in the liquid using:

From 1 mole containing 6.02 *10^-23 atoms, 10.4 *10^-4 moles of pentane will contain:

1 mole = 6.02*10^-23 atoms

10.4 *10^-4 moles = (6.02*10^-23 * 10.4 *10^-4) atoms of pentane

= 62.608 *10 ^-27 atoms of pentane.

So therefore, 41.3 mL of pentane will contain 62.608 * 10 ^-27 carbon atoms

The number of C atoms in 41.3 mL of pentane (C₅H₁₂) of density 0.626 g/mL is 2.16x10²³.

To find the number of C atoms in pentane, we need to find the number of moles.

We can calculate the mass from the density:

[tex] d = \frac{m}{V} [/tex]

Where:

d: is the density = 0.626 g/mL

V: is the volume = 41.3 mL

The mass is:

[tex] m = d*V = 0.626 g/mL*41.3 mL = 25.85 g [/tex]

Now, with the molecular weight of the pentane, we can calculate the number of moles:

[tex] \eta = \frac{m}{M} = \frac{25.85 g}{72.15 g/mol} = 0.358 \:moles [/tex]

The number of C atoms can be found with Avogadro's number:

[tex] n_{C} = \frac{6.022\cdot 10^{23} \:atoms}{1\:mol}*0.358 \:moles = 2.16 \cdot 10^{23} \:atoms [/tex]

Therefore, the liquid contains 2.16x10²³ C atoms.

Learn more here:

https://brainly.com/question/20091306?referrer=searchResults

I hope it helps you!  

1. What is the wavelength of a photon of light with a frequency of 6.10 x 10^15 Hz?

Answers

Answer:

0.000000000000005 mm

Explanation:

Ammonia (NH3) Is base.
How best do you describe Ammonia when dissolved in water

B. Ammonia forms a neutral solution.

C. Ammonia forms a buffered solution.

d. Ammonia acts as base because has OH- and makes water accepts hydrogen.

Answers

Answer:

Ammonia accepts a proton from water

Explanation:

Let us quickly remind ourselves of the Brownstead-Lowry definition of an acid. According to Brownstd-Lowry, an acid is any substance that donates hydrogen ions while a base is any substance that accepts hydrogen ions. The hydrogen ion is also known as a proton.

If we look at the behaviour of ammonia in water;

NH3(g) + H2O(l) ----> NH4^+(aq) + OH^-(aq)

We can easily see that ammonia accepts a proton from water (this makes it a Brownstd-Lowry base) and the hydroxide ion is formed in the process. Water functions as the proton donor here.


Balance the combustion reaction between propane and oxygen.
C ₃ H ₈+ O ₂→ CO ₂ + H ₂ O

Answers

Answer:

The answer is C3H8 + 5O2 3CO2 + 4H2O .

Answer:

[tex]\huge \boxed{\mathrm{C_3 H_8 +5O_2 \Rightarrow 3CO_2 +4 H_2 O}}[/tex]

[tex]\rule[225]{225}{2}[/tex]

Explanation:

[tex]\sf C_3 H_8 +O_2 \Rightarrow CO_2 + H_2 O[/tex]

Balancing Carbon atoms on the right side,

[tex]\sf C_3 H_8 +O_2 \Rightarrow 3CO_2 + H_2 O[/tex]

Balancing Hydrogen atoms on the right side,

[tex]\sf C_3 H_8 +O_2 \Rightarrow 3CO_2 +4 H_2 O[/tex]

Balancing Oxygen atoms on the left side,

[tex]\sf C_3 H_8 +5O_2 \Rightarrow 3CO_2 +4 H_2 O[/tex]

[tex]\rule[225]{225}{2}[/tex]

What is the molarity of a NaCl solution with 3.7 moles and 2.3 L?*

Answers

Answer:

5.0 molatrity

Explanation:

because i just known

Answer:

Approximately 1.61

Explanation:

Molarity = Moles/Liters

Molariry = 3.7 moles NaCl / 2.3L

Molariry = 1.61

Determine the power of 900 joules of work done in 4 seconds

A) 3600 W

B) 225 W

C) 904 W

D) 450 W​

Answers

Answer:

B. 225 W

Explanation:

Power is the measure of the amount of work done in a certain time frame. It can be found using the following formula.

p=w/t

where w is the amount of work done in joules and t is the amount of time in seconds.

We know that 900 joules of work was done in 4 seconds.

w=900 J

t= 4 s

Substitute these values into the formula.

p=900 J/ 4 s

Divide 900 by 4

900/4=225

p= 225 J/s

1 Joules of work per second (J/s) is equal to 1 Watt (W). Therefore, we can substitute Watts for Joules per second.

p= 225 Watts

The power is 225 Watts, and the correct answer is B.

Other Questions
Your mother points out to you a magazine article that says better nutrition is the reason modern Americans are taller than Americans of two centuries ago. What is a valid statement that would contradict this? What is the measure of X ? What is the velocity of a car that travels 556km northwest in 3.2 hours Which reason would most effectively refute the counterclaim?Counterclaim: In addition to writing acclaimed lyrics, Bob Dylan has written both prose and poetry.I have read Dylans book of poetry, Tarantula, and his memoir, Chronicles: Volume One, and think that both books are worthy of the Nobel Prize in Literature. I just dont think that Dylans song lyrics should be awarded in the same category as his books.It is true that Bob Dylan has published traditional poetry and prose. However, neither of the books was very good, and neither won prestigious awards. If the Nobel Prize in Literature considered all writers of at least two mediocre books, the award would mean nothing.It is true that Bob Dylan has published traditional poetry and prose. However, one book of poetry and one memoir would not qualify him for the prize. The prize was awarded based on his songwriting, which does not qualify as literature. The sum of interior angles of a triangle are: 78,39 and a. Find the value of a a. 117 b. 102 c. 93 d. 63 e. Other: What is the slope of a line that is parallel to the graph of 4x +1y = 47 Given the equations below what is the value of ab? 10b-9a=6 b-a=1 Select the correct answer.Select the city that best fits this description:Cest la plus grande ville francophone dans le monde aprs Paris et la plus grande ville dans le monde avoir des passages souterrains.BruxellesOB. QubecOC MontralODParis What are dry docks and what happens there ? (3) What is the quotient of x^2-9x+14/x-7? A. x+2 B. x-7 C. x-2/x-7 D. x-2 Which of these statements best describes Syria's population?Syria has one of the highest population densities in the Middle East.Syria has one of the lowest population densities in the world.The population is growing rapidly at a rate of 10 percent a year.The population of Syria declined from 1990 to 2002. question 2 How did the tank change battle during World War I? What advantages did it provide? In EFG, E \congG, GE = 7 and FG = 15. Find the length of EF. The political cartoon below references the: - Sherman Anti Trust Act- Lend Lease Act- Quota System- Cash & Carry policy Whats the correct answer for this? Match each opinion statement on the left to the fact or reason on the right that substantiates it.This building will probably collapseHe is polite and friendlysoonHe would be a good restaurant host.The walls are tilted, and most of thebolts are rusty or brokenLake Elmo is a great place to visitThere are many restaurants andrecreational activities nearbyYou should wear a hat and coat.It is only thirty degrees outside. Determine the value of z in the figure answers: z = 50 z = 45 z = 10 z = 30 Please help! Correct answer only!In a raffle, one ticket out of 250 will win a $230 prize. The rest will win nothing. If you have a ticket, what is the expected payoff?$__ I'm so sorry but I forgot and some of my notes are at school ( don't mind the yellow/orange high light )