Chemistry Middle School

Why you cannot add 0.3 moles of calcium fluoride directly to 1L of water to make a 0.3 M solution ? please only 5 mins left

Answers

Answer 1

Answer:

Because it's not soluble in water, need to be heated acidic solution

Explanation:

Calcium Fluoride Formula: CaF2  Comprises of Ca2+ and F−

H2O = Water H+ O2- OH-

Insoluble in water

In order to dissolve a salt, you have to break apart the ions and hydrate them via a solvent.

Need to read

HSAB concept( Pearson acid-base concept) is an initialism for "hard and soft (Lewis) acids and bases"

So F- is a Halogen which is a Hard Base

And OH- is a Hard base as well

And H- is a soft base

So soft acids react best with soft bases and hard acids react best with hard bases.

Bases don't react with other bases.

Related Questions

What compound is essential for virtually all biochemical reactions?

Please explain your answer.

Answers

Ne demek istoyusun anlamadım

Fill each box with the chemical formula of the compound. ​

Fill each box with the chemical formula of the compound.

Answers

LiF , LiBr, Li20, Li2S, Li3N, Li3P, LiI
NaF, NaBr, Na2O, Na2S, Na3N, Na3P, NaI
KF, KBr, K2O, K2S, K3N, K3P, KI
BeF2, BeBr2, BeO, BeS, Be3N2, Be3P3, BeI2
MgF2, MgBr2, MgO, MgS, Mg3N2, Mg3P2, MgI2
CaF2, CaBr2, CaO, CaS, Ca3N2, Ca3P2, CaI2

Hope this helps! Make sure that the numbers are written small at the bottom of the letter cause it wasnt possible to do that here.

Which object has the most kinetic energy?

A. a train that is stopped
B. a car moving at a slow speed
C. ​​a train moving at a slow speed
D. a car that is stopped at the top of a hill

Answers

C

Explanation: kinetic energy means that the object is moving, automatically eliminating A and D since they are both stopped. The formula for kinetic energy is KE=1/2m(v^2) (m= mass and v= velocity). Since the train has more mass than the car, the train has more kinetic energy.
C is the right answer because train has more mass than car

Why are most plants that grow in the tundra small with thin, wax-covered leaves?

The plants need to be able to grow in sandy soil.
The plants need to be able to grow in sandy soil.

The plants need to survive the hot temperatures in the summer.
The plants need to survive the hot temperatures in the summer.

The plants need to survive the year-round dry conditions.
The plants need to survive the year-round dry conditions.

The plants need to be able to grow in the moist, humid air.

Answers

the plant needs to be able to grow in sandy soil, survive in hot temperatures, and year round conditions

Answer:

The answer is (The plant needs to be able to grow in sandy soil, survive in hot temperatures, and year round conditions.)

Explanation:

If you have any questions please ask me! :)

Which of the following points is/are true for plasma?
(1) It is a very good conductor of electricity.
(2) Gas is transformed into plasma state.
(3) It is influenced by magnetic and electric fields.
(4) All of the choices

Answers

Answer:

4 all of the choices. the rest of the answers are correct so it's all of the choices

The answer is 4. This is the answer because the first 3 are all correct

In an electrical wire, if instead of copper, plastic wire is used. Would it conduct electricity?Justify your answer.

Answers

Answer:

No, a plastic wire would not conduct electricity. This is because plastic is an insulator that does not allow electric current to flow through it. In a wire, electrical conductivity is provided by the movement of charged particles - typically, electrons. Copper is an excellent conductor of electricity because it has a high number of free electrons that are not bound to atoms and can move through the wire very easily. However, in a plastic wire, the tightly bound electrons of its atoms do not allow for the free flow of charges, thus preventing the passage of electric current.

No it would not conduct electricity as it is a insulator

G
A substance occupies one half of an open container. The atoms of the substance are closely packed but are still
able to slide past each other.
What is most likely the phase of the substance?
gas
liquid
solid and gas
O liquid and solid
Mark this and return
Save and Exit
Next
Submit

Answers

Answer:

Solid and gas

Explanation:

The total answer is solid and gas

Which following statements is true?

Electrons contribute most of the mass of an atom.
Electron placement determines an atom’s reactivity.
Proton location determines properties such as luster.
Neutrons determine whether an atom is liquid at room temperature.

Answers

Answer:

first one

Explanation:

hope this helps

El primero es la verdad

If a substance has a density of 19 g/cm3, then what is the mass of 8 cm3 of this substance?

Answers

The mass is 2.375 grams
The mass is 3.375 grams

Provide 3 examples of substances that are mixtures and list the substances in them.

Answers

Salt and water
Sugar and salt
Salt and pepper
Bleach Sulfrate Meth and pure vinegar Salt Sodium Cloride

please help!!!!!!!!!!!!!!!!!!!

please help!!!!!!!!!!!!!!!!!!!

Answers

Answer:

Your body cells use the oxygen you breathe to get energy from the food you eat. This process is called cellular respiration. During cellular respiration the cell uses oxygen to break down sugar. Breaking down sugar produces the energy your body needs.

Explanation:

Brainly pls

By adding lubricant to the wheels of his car, Santiago determines that he can increase his car's average speed to 29.5 cm/s. What percentage increase does this represent?

Answers

Answer:

hbsehr

Explanation:

plz answer fast in 3 sentences thx (XOXO) ;) will give brianly
Why is the use of the inquiry process (or scientific method) a practical way to approach science?
1.
2.
3.

Why are scientific theories modified, but seldom discarded?
1.
2.
3.


How has science and technology influenced everyday life?
1.
2.
3.

Answers

Answer:

Explanation:

Why is the use of the inquiry process (or scientific method) a practical way to approach science?

1. The inquiry process is a practical way to approach science because the inquiry process begins by asking questions and moving on from there.  

2. In science it is important to investigate phenomena or certain subjects by posing questions that you would like to answer through the scientific method.

3.  Therefore, the inquiry method is connected because to inquire on a subject requires raising questions which is an essential step in scientific discovery.

Why are scientific theories modified, but seldom discarded?

1.  If a theory cannot explain new evidence or observations then the theory is revised or even thrown

out, but if the theory still explains a wide range of observations and evidence then it is revised

rather than discarded.

2.  it will still hold some value as above as you learn more you tweak your hypothesis to fit the ever expanding amount of info and data you collect and assimilate

3.  The only way they ever go away is if people stop working on them.

How has science and technology influenced everyday life?

1.  computers

2.  health care

3. bikes

None of these would exist today without science or technology

Answer:

Explanation:

Why is the use of the inquiry process (or scientific method) a practical way to approach science?1. The inquiry process is a practical way to approach science because the inquiry process begins by asking questions and moving on from there. 2. In science it is important to investigate phenomena or certain subjects by posing questions that you would like to answer through the scientific method.3. Therefore, the inquiry method is connected because to inquire on a subject requires raising questions which is an essential step in scientific discovery.Why are scientific theories modified, but seldom discarded?1. If a theory cannot explain new evidence or observations then the theory is revised or even thrownout, but if the theory still explains a wide range of observations and evidence then it is revisedrather than discarded.2. it will still hold some value as above as you learn more you tweak your hypothesis to fit the ever expanding amount of info and data you collect and assimilate3. The only way they ever go away is if people stop working on them.How has science and technology influenced everyday life?1. computers2. health care3. bikesNone of these would exist today without science or technology

Compare and contrast the applications and benefits of circle graphs and bar charts

Answers

Answer: sorry here for points

what is the awnser??? (pic is below)

what is the awnser??? (pic is below)

Answers

Answer:

C: Radiation. Arrow x shows radiation. I hope this helps u! If it's wrong, please let me know!!

Convection heat is the mode of heat transfer that is taking place in water.

Help me out, please.

Help me out, please.

Answers

Answer:

I'm going to have to say A

Explanation:

I think it’s A. Jdjdnd

How to work out the relative mass of potassium? What is the calculation? ( explained very easily )

Answers

Answer:

39

Explanation:

Relative mass does not need to be calculated as it is listed on the periodic table. Potassium's relative atomic mass is around 39.

Relative Atomic Mass = Mass of one atom
———————————
(1/12)th Mass of one C12 atom

Kiley wants to balance the equation H2 + N2 → NH3. Which would be her first step in balancing an equation?

Answers

Answer: The balanced equation will be

6H2 + N2 → 2NH3

Explanation:

First step is to balance nitrogen

ie, H2 + N2 → 2NH3

Second step is to balance hydrogen accordingly

ie, 6H2 + N2 → 2NH3

This is the perfect balanced equation.

Answer:

c

Explanation:

c

How does the existence of the Gulf Stream affect the climate of Europe and the North Eastern US?

Answers

Answer:

The strong current of warm water influences the climate of the east coast of Florida, keeping temperatures there warmer in the winter and cooler in the summer than the other southeastern states. Since the Gulf Stream also extends toward Europe, it warms western European countries as well.

The east coast of the United States is affected mainly by the Gulf Stream current, which brings warm water from the tropics into higher latitudes. The warm current flows north along the coast towards Maine, before veering northeast out toward England.
It affects weather in the U.S., too. By bringing so much warm water along the mid-Atlantic and southeastern states, it adds some warmth to the eastern coast of the U.S. The Gulf Stream also affects the paths of hurricanes, and their strength they intensify as they draw up the heat from the warm water.

What is an ellipse please help)

Answers

normal oval shape traced by a point moving in a plane so that the sum of the distance from the other points is constant.

In mathematics, an ellipse is a plane curve surrounding two focal points, such that for all points on the curve, the sum of the two distances to the focal points is a constant. As such, it generalizes a circle, which is the special type of ellipse in which the two focal points are the same.

Maybe they might use that math thing for Science.

Question 1 of 23
The diagram below shows two mugs of coffee mug A and mug B). Both mugs have the same temperature, but mug A contains 30 ml, while mug B contains 5
thermal energy in both mugs?
B
30°C
30°C
.ll Lisa ko
30 ml
5 ml
O Mug A has more thermal energy than mug B
O Mug A has less thermal energy than mug B
O Mug A and B have the same thermal energy
Previous Question
Flag for re

Answers

Answer:

mug A has more thermal energy

Explanation:

List the five physical phase changes of matter and give one example for each.

Answers

Answer:Melting.

Freezing.

Evaporation.

Condensation.

Sublimation.

Explanation:

Answer: Examples for the five transformations previously given.

For the first four, we encounter common examples in everyday life, all to do with water:

Freezing - liquid to solid, e.g. water to ice, e.g. making ice cubes.

Melting - solid to liquid, e.g. ice to liquid water, melting ice cubes or snow flakes.

Condensation - gas to liquid, e.g. water vapor (gas) to liquid -  water vapor in air (humidity) condenses to form liquid droplets on the outside of a cold beverage glass on a hot humid day; or cloud formation  in the atmosphere.

Evaporation - liquid to gas, e.g. liquid water on clothes evaporates as clothes dry on clothesline or in dryer

While water can sublime under certain conditions of temperature and pressure, it is less evident in everyday life.  Carbon dioxide however is a more common example.

Sublimation - solid to gas, e.g. "dry ice" disappearing. The visible smoke associated with dry ice is most likely just condensing water vapor in the air as the solid carbon dioxide cools the air.

Explanation:

How can the rate of a reaction be decreased?
Responses

A: having more surface area

B: lowering the amount of reactants

C: adding a catalyst

D: raising the temperature

Answers

B: lowering the amount of reactants

It’s B ! Lowering the amount of reactants.

How can chemical energy be converted into mechanical energy?

A. turning on a flashlight

B. sharpening a pencil with an electric pencil sharpener

C. heating up bread in a toaster

D. eating breakfast and then going for a run

Answers

answer:

eating breakfast and then going for a run

Answer: D. Eating breakfast and then going for a run.

Explanation:

Eating breakfast is a chemical change and running is a mechanical change.

help me fill this page with the right answer please (17 lines minimum please)

help me fill this page with the right answer please (17 lines minimum please)

Answers

I am water moleculeI have to first bear the heat of sun .Then the heat evaporates me into vapours I am send to the atmosphere with my brothersThen I have to form clouds Then precipitation or density of our brothers increasesWe keep increasingThen once a time comes when we are full We then condensed down to earthWe comes back in the form of rainThen either we are stored in some place or undergroundThen people collects us from different places like pond,river etc
Hey Lenny lately I’ve been having a rough time in the water cycle. It all started when I was chilling in my favorite location the “glaciars” and suddenly the sun turned me into liquid form. Next thing I know I am hurdling down a river straight into a massive lake. Personally this is my least favorite stage of the water cycle because of kids and bacteria that lurk in the water, very scary things. I didn’t stop at the lake very long, and instead sunk into the soil in a process called collection so I could become ground water. Underground reservoir’s are much more peaceful then lakes and I wanted to stay there. However I was forced up a water well pump shortly after and sent through a long tube. Me and couple of the friends I met on the way were all dispersed over a giant grass feild. Many molecules in the group were captured by the hostile plants but I escaped through the means of evaporation. Currently I have condensed into cloud form and I am roaming the skies looking for you, when you get this let me know and I’ll percipitate in your area! P.s I found this photo of us freezing over in the ice age lollll.
help me fill this page with the right answer please (17 lines minimum please)

what is the relationship between convince and suspect?

Answers

The relationship between "convince" and "suspect" is that they are opposites.
To convince someone means to persuade them to believe or do something. This involves gaining their trust and making them feel confident in your argument or proposal.
On the other hand, to suspect someone means to have doubts or distrust about their motives or actions. This involves questioning their credibility and being cautious about their intentions.
So, while convincing involves building trust and confidence, suspecting involves the opposite - doubting and being cautious.
convince is to make someone believe, or feel sure about something, especially by using logic, argument or evidence while suspect is to imagine or suppose (something) to be true, or to exist, without proof.

PLEASE HELP I WILL MARK BRAINLIEST!!!

How much power is indicated by each example?

PLEASE HELP I WILL MARK BRAINLIEST!!!How much power is indicated by each example?

Answers

Answer:

The first is five and the second is ten

Explanation:

First one : 5
Second one : 10

all minerals on the mohs hardness scale are hard enough to scratch a piece of glass is it true or false
PLEASE I NEED HELP
science

Answers

the answer is false
the answer to ur question is false

List at least three properties of matter.

Answers

Answer: Mass, Volume, shape

Explanation: that’s the three basic properties of matter

Answer; Mass, Volume, Shape

Pls help!!! ILL GIVE BRAINLIEST, 70 points + 10 more if not plagiarized ty ty (also for those who scam and do it for the points will be reported)

Pls help!!! ILL GIVE BRAINLIEST, 70 points + 10 more if not plagiarized ty ty (also for those who scam

Answers

Answer:Pls help!!! ILL GIVE BRAINLIEST, 70 points + 10 more if not plagiarized ty ty (also for those who scam and do it for the points will be reported)

Explanation:

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