Can anyone explain and answer?
Which physical change are both exothermic
A)condensation and evaporation
B)evaporation and melting
C)freezing and condensation
D)melting and freezing

Answers

Answer 1

Answer:

I would say C.)

Explanation:

Freezing and condensation are both ways that heat is let out from an object.


Related Questions

why do water bodies evaporate.

Plss I need help​

Answers

Answer:

the heat from the sun makes the water molecules move faster and faster, until they move so fast they escape as a gas.

Explanation:

please tell me if I'm wrong

Which of the following equations is NOT balanced?A MgCO3→MgO + CO2 B NaCl + KI →NaI + KCl C Na + O2 →Na2O D Ca + MgSO4→CaSO4+ Mg

Answers

Answer: C

Na + O2 →Na2O

Explanation:

A

MgCO3→MgO + CO2 balanced

B

NaCl + KI →NaI + KCl balanced

C

Na + O2 →Na2O not balanced the balanced would be 4Na + O2 →2Na2O

D

Ca + MgSO4→CaSO4+ Mg balanced

The mass of the nails and copper sulfate solution used in this investigation was 250g The mass of the copper and tran sulfate solution produced in this
nvestigation would be
250g

Answers

He it would because 250g is the answer is to 256g

Answer:

He it would because 250g is the answer is to 256g

Explanation:

show how to work it out.
.How many sodium atoms are there in 26.3 grams of sodium oxide (Na2O)? Answer: 2.55 E 23 molecules of Na2O

Answers

Start with your mass given, then divide by total mass of Na2O (found on periodic table), then multiply by avragodros # to get final answer

30 PTS!! chemistry - a new element chemistry TCT

Answers

Answer:

so is this a project or a quiz

The nucleus of one atom contains 12 protons and 12 neutrons, while the nucleus of another atom contains 12 protons and 16 neutrons. What are the atoms?
A) chromium atoms
B) two different elements
C) two isotopes of an element
D) negatively charged

Answers

Answer:

Option C (two isotopes of an element)

Explanation:

An isotope is two or more forms of the same element that contain equal numbers of protons (as well as electrons) but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties. For example :-

Isotopes of carbon ⇒

¹²C₆ (Carbon-12) has 6 electrons , 6 protons & 6 neutrons.¹⁴C₆ (Carbon-14) has 6 electrons , 6 protons & 8 neutrons.

In the question , both the atoms have same number of protons , but their number of neutrons isn't same. Hence , they are the isotopes of an element.

When you break an iron magnet into two pieces, you get ____.


two north poles

two south poles

two north poles and two south poles

a piece of iron that is no longer magnetic

Answers

Answer:

two north poles and two south poles

Explanation:

A single magnet has a north pole and a south pole. If it is broken into two pieces, then each of the two pieces will have a north pole and a south pole.

No matter how many times or into how many pieces a magnet is broken, the resulting pieces will have two poles each.

Answer:

Each piece will still have a north pole and a south pole.

Explanation:

how many total atoms are in v2o5

Answers

Answer:

7 atoms

Explanation:

2Na + 2H2O = 2NaOH + H2.
how many moles of H2, could be made from 27.6g H2O?

Answers

Answer:

A)27.6g H2O x (1 mole H2O/ 18.02g H2O) x (1 mole H2/ 2mole H2O)

= 0.766 mol H2 x 6.022 x 10^23

= 4.61 x10^23 molecules

B)12.9g H2O x (1 mole H2O/ 18.02g H2O) x (2 mole Na / 2mole H2O)

=0.716 mol Na x 6.022x 10^23

= 4.31 x 10^23 atoms

Explanation:

I hope it's help

20 POINTS TO WHO ANSWERS THIS
How can a chemical reaction be sped up?

Select from the drop-down menu to correctly complete the statement.
Increase the to allow the reaction to happen with more energy.
A) Catalyst
B) Concentration
C) Surface Area
D) Temperature

Answers

answer: D

Here is a list of the most common ways to speed up a chemical reaction

Increase the temperature (reactions that absorb energy)

Decrease the temperature (Reactions that release energy)

e the given conversion factors below to convert between mass and number of representative par
plecules, and ions)
oblem: How many molecules of methane (CHA) if there are 9.65 gram of methane ?

Answers

Answer:

3.63 x 10²³molecules

Explanation:

Given parameters:

Mass of methane = 9.65g

Unknown:

Number of molecules  = ?

Solution:

To solve this problem first, we find the number of moles of the given compound or molecule first.

The given molecule is methane;

    CH₄;

     Number of moles  = [tex]\frac{mass}{molar mass}[/tex]

Molar mass of CH₄   = 12 + 4(1)  = 16g/mol

    Number of moles  = [tex]\frac{9.65}{16}[/tex]   = 0.603moles

So;

From mole concept;

      1 mole of a substance contains 6.02 x 10²³ molecules

    0.603moles of methane will contain 0.603  x  6.02 x 10²³

                                                               = 3.63 x 10²³molecules

10. There are two bears that both have the same proteins for ear shape in their cells. The bears have
different parents. What can you say about the bears' ear shape?

Answers

Answer:

They will have the same ear shape since their proteins connect in the same ways to determine ear shape.

Explanation:

I majored in Chemistry

Answer:

They will have the same ear shape since their proteins connect in the same ways to determine ear shape.

Explanation:

The Aufbau Principle describes that
O electrons with the same spin cannot occupy the same orbital.
electrons will occupy single orbitals within and energy level before doubling up
electrons fill lower energy levels first before occupying higher energy levels.
O electrons in the same level have the same amount of energy

Answers

Answer:

electrons fill lower energy levels first before occupying higher energy levels.

Explanation:

The Aufbau's principle describes that electrons fill lower energy levels first before occupying higher energy levels.

In writing the electronic configuration of atoms, the Aufbau's principle is one of the most important principles to consider.

It states that "sublevels with with lower energies are filled up before those with higher energies".

Sublevels do not fill up in numerical order.

Is MgF2 polar or no polar covalent?

Answers

Answer:

ionic

Explanation:

In this instance, fluorine is a non-metal while magnesium is a metal. Ionic bonds are always formed when a metal and a non-metal are combined. Therefore, magnesium fluoride is an ionic compound, and an ionic compound's inter-ion force is always an electrostatic force.

The molecule's ionic bond is exceedingly powerful. When a molecule dissolves in water, it releases a significant amount of ions into the mixture. For the same reason, it conducts electricity as well. This explains why magnesium fluoride is naturally polar.

One type of binary ionic compound is magnesium fluoride. It consists of one magnesium atom and two fluorine atoms. In comparison to fluorine, magnesium is a metal with a substantially lower electronegativity.

To know more about ionic compounds, visit;

https://brainly.com/question/13058663

#SPJ6

Which job title describes a person with a career in green energy?

Answers

Answer:

Natural resource professional

Explanation:

The job title that describes a person with a career in green energy is a hydroelectric technician. The correct option is c.

What is green energy?

Green energy is renewable energy and these energies are produced by renewable resources. Renewable resources are the resources that will not be reduced, and these natural resources are present, and these energies can reproduce again by these resources.

The hydroelectric technician is the person who checks the technical problems of a hydroelectric power plant. Hydroelectricity is produced by water.

This is a renewable resource, and it does not produce any kind of pollution, So a hydroelectric technician will be a job title that describes a person with a career in green energy.

Therefore, the correct option is c., hydroelectric technician.

To learn more about renewable energy, refer to the link:

https://brainly.com/question/17373437

#SPJ2

The question is incomplete. Your most probably complete question is given below:

Elevator installer

sewing machine operator

hydroelectric technician

animal trainer

How many grams are in 25.0 moles of carbon tetrachloride (CCI)?

Answers

Answer:

3.84 kg

Explanation:

CCl4 molar mass: 153.82 g/mol

n = mass / molar mass

25 moles = mass / 153.82 g/mol

mass = 25 x 153.82

mass = 3845 g or 3,84 kg

E. What is one way that your body knows if it is upside-down or not?

Answers

Answer:

You get some type of pressure that you start to feel in your muscles and joints from gravity and movement. How do they say it? Something called "seat-of-the-pants" (something like that). You get some type of pressure, and your body senses it, and it knows when you are upside-down or not, because if you're not, then you won't get any pressure in your muscle.

Hope this helped!

Have a supercalifragilisticexpialidocious day!

When a compound such as X2Z4 is created, what would be the
correct simplified chemical formula?

Answers

Answer:

XZ2

Explanation:

There are different ways in which compounds can be represented. Broadly, we have three different types of formula;

- Structural formular: This shows how th atoms in te compound are connected to each other.

- Molecular formular: This shows the actual number of atoms of element present in the compound

- Empirical Formular: This is the simplest formular of a compound. It basically shows the number of atoms in simple ration to each other.

This question requires us to input the empirical formular;

X2Z4

The ratio of the elements is; 2 : 4 which can be simplified into 1 : 2

This means the empirical formular is XZ2

What is temperature

Answers

Answer:

I just love the killua pfp

I think b

Answer:

c

Explanation:

because it forces and help it

Which of the following is NOT a true statement?
А The sun's gravity keeps the Earth spinning around it.

B The moon's gravity pulls on the Earth's ocean.

C Earth's gravity keeps the moon close to it.

D Earth's gravity keeps all the planets spinning around the sun.

Answers

Answer:

c is not a true statement

Answer: it’s

Earth gravity keeps all the planets spinning around the sun.

Explanation:

Got it right

1234567 sc: thatbitxh.lizzy

Answers

Answer:

okyay

Explanation:

lol

Answer:

12345678

Explanation:

i don't know so yea

How does dormancy most likely help a plant survive?
A.It helps a plant grow taller.
B.It helps a plant absorb sunlight.
C.It helps a plant conserve energy.
D.It helps a plant camouflage itself.

Answers

Answer:

C. It helps a plant conserve energy.

Explanation:

Dormancy is a time in a plants life that it stops all physical growth, therefore conserving energy.

Hope this helps.

3.1 Copper is a transition
metal. Which part of the
modern Periodic Table is
copper placed in? (1 mark)​

Answers

Explanation:

Transition metals occupy the d block of the periodic table. Their location is right between the group 2A and 3A. Copper (Cu) is in the first row of the d-block elements. The image attached illustrates the position of the transition metals relative to other elements in the periodic table.

how many molecules are in 0.89 of silver

Answers

Answer:

5.36 × 10²³ molecules

Explanation:

Given data:

Number of moles of silver = 0.89 mol

Number of molecules = ?

Solution:

Avogadro number:

The number 6.022 × 10²³ is called Avogadro number.  

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen

Number of molecules of silver:

1 mole contain 6.022 × 10²³ molecules

0.89 mol  ×  6.022 × 10²³ molecules /1 mol

5.36 × 10²³ molecules

Imagine that you skipped from one end of a room to the other end of the room. Explain how gravity affected your motion.​

Answers

Answer:

when you skipped you jumped up but gravity pulls you to the ground when you jump

Explanation:

On skipping in a room, gravity affects the motion by pulling back to the ground.

Gravity has been defined as the force acting by the earth in the downward direction. It has been the strongest force and has been responsible for life on earth.

On skipping in a room from one end to another, there has been a force applied in the direction against gravity. The application of force has resulted in an upward motion. The gravitational force has been acting in the downward motion, and result in pulling back to the ground.

Thus, on skipping in a room, gravity influences the motion by pulling back to the ground.

For more information about gravity, refer to the link:

https://brainly.com/question/1479537

How many molecules are in 643.21 grams of Mg3(PO4)2?

Answers

Answer:

643.21g  1 mol  6.022^23

262.87 g   1 mol

= 1.4735E24     [Mg3(PO4)2]

how is carbon dioxide manufacture in the industry ​

Answers

Explanation:

While CO2 can be distilled from the air, that method is expensive and inefficient. Therefore, it is usually captured from other sources where it is a waste material. This could be anything from brewing beer to burning fossil fuels. However, the most efficient way of producing carbon dioxide is from ammonia.

Write any four properties of water.​

Answers

Answer:

it is in liquid state.

it shapes as the object is .

it can change into gas state by heating .

it has on colour.

An atom is found in group 17 and contains 10 neutrons. How many valence
electrons does it have? *

Answers

Just 7 electrons this is the answer

A 5.0 L chamber contains equal pressures of H₂ and N₂ at 25 °C. Which of these gases contains a larger number of molecules?

Answers

Answer:

C) Both have equal numbers of moles.

Explanation:

The number of moles would be the same under the same pressure, volume and temperature.

"If A 5.0 L chamber contains equal pressures of H₂ and N₂ at 25 °C then both gases would have equal number of molecules according to Ideal Gas Law."

Both contain equal number of molecules.

According to Avogadro's Law, 1 mole of every substance occupies 22.4 L at STP.

Thus, equal volume of all gases contain same number of molecules at same temperature and pressure.

[tex]PV=nRT[/tex]

where, P = pressure

V = volume

n = moles

R = gas constant, and

T = Temperature

As volume , pressure and temperature are equal for both [tex]H_2[/tex] and [tex]N_2[/tex] gases, therefore both gases contains equal moles and hence equal number of molecules.

Learn more about Avogadro's Law:

https://brainly.com/question/4133756

Other Questions
Darkness settles on roofs and walls,But the sea in the darkness calls and calls;The little waves, with their soft, white hands,Efface the footprints in the sands,And the tide rises, the tide falls.The morning breaks; the steeds in their stallsStamp and neigh, as the hostler calls;The day returns, but nevermoreReturns the traveller to the shore,And the tide rises, the tide falls. PLEASE HELP ME!!!! I WILL GIVE BRAINLIEST At Medallion Industries, variable cost per unit is budgeted to be $8.00 and fixed cost per unit is budgeted to be $5.00 in a period when 4,000 units are produced. What is the expected total cost of the units produced at Medallion, if instead, production is actually 5,100 units Sodium chloride reacts with phosphoric acid to form sodium phosphate and hydrochloric acid.Answer in a balanced chemical equation. This question has 2 parts. Be sure to complete all parts.n a tree.AHow does the poem show that the speaker has grown weary of apple picking?0 A.The speaker decides to finish picking the remaining apples the following day.OB.The speaker feels that he must be careful not to damage the apples.OC.The speaker decides to take a nap and leave the ladder against the apple tree.ODThe speaker feels that he is likely to see apples even in his dreams.oughBWhich lines from the poem best support the answer in PartA? Choose two answers."For I have had too muchOf apple-picking" PPPPPPLLLLLLLLLEASE HELP WILL GIVE BRAINLIEST PPPPPPPPPPPPPPPPPPPLEEEEEEEEEEEEASE HELP Vvvvvvvvvv How has one invention in telecommunication helped lead to the next one? A map company used a scale of 1 inch : 380 meters to depict the heights of different mountains. What is the height of a mountain on map, which is actually3420 meters high?The height of the mountain on the map isinches How might a sudden cold front limit population growth of newborn offspring?"" HELP PLEASE The chart below gives prices and output information for the country of Utopia. Use this information to calculate real and nominal GDP for both years. Use 2001 as the base year.Year 2000 2001 Price Quantity Price QuantityIce Cream $7.00 600 $3.00 400Blue Jeans $70.00 20 $20.00 90Laptops $300.00 5 $300.00 52000 nominal GDP = $_________2001 nominal GDP = $_________2000 real GDP = $_________2001 real GDP = $_________ Huilan is 11 years older than Thomas. The sum of their ages is 65. What is Thomas's age? solve for x (pls help :,,)) 1. Select all of the fraction models that are equivalent. d. You'll be given 100 points if you answer this question!!!!!!!!!!!!3.What do we call materialsthat let heat pass throughthem easily?Thermal conductorsThermal insulatorsTransparent4.Which of these is a goodthermal conductor?PlasticWoodSteel5.Which of these is a goodthermal insulator?SteelIronPolystyrene6.To save on heating bills, doyou think the roof of abuilding should be lined witha thermal conductora thermal insulatornothing7.How does heat travel?From cold things to hotter thingsFrom hot things to colder thingsBetween things of the same temperature What is the 59th element Did I do this correctly? if not pls help me Complete the following sentence. Remember to spell correctly.Limiting the amount of imported sugar that can be brought into the United States is an example of a(n) (what?) Help ASAPA ruler is 12 inches long. What is the length of this ruler in centimeters? Round to the nearest hundredth. 6. How did the Soviets feel about Democracy? What evidence is there that all living things are made of cells? What is the value of the missing angle? The angle is 50, because 140 - 90 = 50The angle is 40, because 180 - 40 = 40The angle is 320, because 180 + 140PLEASE ANSWER FAST!!!