Which of the following are characteristics of ionic
compounds? Check all that apply.
-have high melting and boiling points
-are hard
-can exist as solids, liquids, or gases at room
temperature (25°C)
-are good conductors of electricity when
dissolved in water
A, B, D are correct
Answer:
have high melting and boiling points are hardare good conductors of electricity when dissolved in waterExplanation:
Ionic compounds are compounds that are formed between a metal and non-metal with a significant electronegativity difference. The metals transfers their electrons to the non-metals and the electrostatic attraction of the ions brings about the bonding that forms the compound.
Ionic compounds are diverse in nature and form.
Here are some of their properties:
They are usually hard solids with a high melting point or liquids with high boiling pointsThey are soluble in water and non-soluble in non-polar solventsThey are able to conduct electricity in molten form. They undergo very fast reaction in aqueous solutions.Predict which moon phase will occur about one week after a full moon?
Answer:
waning gibbous I belive
Explanation:
Answer:
third quarter moon
Explanation:
How do scientists measure the idea of time so long ago?
The Ancient Egyptians used simple sundials and divided days into smaller parts, and it has been suggested that as early as 1,500BC, they divided the interval between sunrise and sunset into 12 parts. ... Known as a clepsydra, it uses a flow of water to measure time.
some substances bout not others can cross the (blank) membrane of a cell
Answer:
lipid bilayer
Explanation:
I looked it up .
Which salt is produced when NH OH reacts with HNO3?
A: KNO2
B: NaNO3
C: NH4NO3
D: NH4NO2
Answer:
C. NH4NO3 ammonium nitrate is formed when the two acid and base react
Please help me with this chem question it’s due by midnight. I know the answer choice isn’t C.
Answer:
I believe the answer is A
Explanation:
I hope this helps :)
In an experiment to find the concentration of calcium hydroxide in limewater , 25.0 cm3 of limewater needed 18.8 cm3 of 0.0400 mol/dm3 hydrochloric acid to neutralise it.
Answer:
0.01504 mol/dm3
Explanation:
Calcium Hydroxide - Ca(OH)2
Hydrochloric acid - HCl
The reaction between both is given as;
2HCl + Ca(OH)2 --> CaCl2 + 2H2O
2 : 1
The relationship between the concentration and volume is given as;
CaVa / CbVb = na / nb
where a = acid (HCl) and b = base Ca(OH)2
Inserting the values;
0.04 * 18.8 / (Cb * 25) = 2 / 1
0.752 / 25Cb = 2
Cb = 0.752 / 50 = 0.01504
The choices are position, magma, power plants, nuclear, light, food and fuel, and solar
Explanation:
Electrical energy is produced by power plants.
The Light which comes from the Sun.
Chemical energy that is formed in magma.
Nuclear which is stored in the nucleus of an atom.
Geothermal which comes from solar.
Fuel is an inexhaustible resource.
Potential is the energy of position.
Scientists now understand that light behaves as
a
a. particle only
b. neither a particle nor a wave
c. both a particle and a wave
d. a wave only
Answer:
C. both particle and a wave
Answer: C. Both a Particle and a Wave
Explanation:
Light can travel as particles or like waves. We can see it traveling like particles when a firefly glows. That is still a version of light. It travels as a wave when you turn on your light, faster than sound can. These are the two versions of light, particle and wave. The answer is C. Both a Particle and a Wave
HELP MEEEEEEEEE PLSSSSSSSSSSSSSSSS
_______________the movement of a fluid caused by differences in temperature, that transfer heat from one part of the fluid to another.
________________the transfer of thermal energy by the movement of a fluid.
________________the envelope of gases that surrounds Earth.
________________the pressure caused by the weight of a column of air pushing down on an area.
________________are calm. Area where warm air rises. They occur at the equator where the sun heats the surface strongly.
_________________blow from the horse latitude towards the equator.
________________they blow from west to east, away from the horse latitude.
________________bands of moving air created as a result of the movement of the Earth along with the heat from the sun.
Answer:
1. Convection current
2. Convective heat transfer
3. The Atmosphere
4. Air pressure
as the depth of the ocean increases the amount of sunlight and water temperature will..
Answer:
Decrease
Explanation:
The lower you go, the colder because the sun can't reach lower levels of the ocean.
Answer:
decrease
Explanation:
less sunlight will be able to reach the farther down you go and the less sunlight there is the colder it gets
How many oxygen atoms in C10H20
Answer:
One oxygen atom I think..as C10 is 10 atoms of carbon, and H20 is two atoms of hydrogen with one atom of oxygen
Explanation:
Which two elements are combined in hydrogen sulfide
100 POINTS!!
Solid aluminum, Al(s), is dropped into hydrochloric acid, HCl(aq). The masses of the substances are listed below.
Mass of Al = 700g
Mass of HCl = 3000g
1. Write a balanced equation for the reaction.
2. Identify the limiting reactant and theoretical yield. Show your work.
3. A given trial of this reaction produced 3262g of AlCl3. What is the percent yield of the reaction. Show your work.
Answer:
Isnt it only 50 points??????????????????
What caused these substances to come together in a ball in space? *
Answer:My guess is the gravitational force between the objects or substances.
Roller coaster cars move slowly at the top of the hill, so they have little kinetic energy. The speed of the cars increases as they move down the hill. This increased the cars' kinetic energy. Where might this extra kinetic energy have come from?
a.) kinetic energy was added by pushing the cars
b.) potential energy was transformed into kinetic energy
c.) the cars always had kinetic energy
d.) kinetic energy was transferred into potential energy
Answer:
b.) potential energy was transformed into kinetic energy
Explanation:
According to the law of conservation of energy, energy is neither created nor destroyed but transformed from one form to another in a system.
So, in this system, energy is not created neither is it destroyed.
The increase in kinetic energy of the car is due to the conversion of potential energy to kinetic energy. Potential energy is due to the position of a body. As the car winds down the hill slope, the potential energy is transformed to kinetic energy. Also, the velocity of the body increases.How many moles of c6h12o6 are there if you have 3.59 x 1024 molecules of c6h12o6
Perform the following mathematical operation and report the answer to the appropriate number of significant figures 0.2543 + 0.46
pls really need help with chemistry questions :((
Answer:
6. 13.8 moles
7. 0.751 moles
8. 2.04 moles
9. 0.00794 moles
10. 0.158 moles
Explanation:
When converting from atoms to moles, use Avogadro's number.
Avogadro's number is 6.02 x 10^23.
After that, then use dimensional analysis for every problem to show your work.
6. (8.31 x 10^24 atoms of magnesium) * 1 mol Mg / (6.02 x 10^23) atoms = 13.80398671.
With sig figs however, it rounds to 13.8. Therefore, there are 13.8 moles of magnesium.
7. (4.52 x 10^23 formula units NaCl) * 1 mol NaCl / (6.02 x 10^23) atoms = 0.750830565.
With sig figs however, it rounds to 0.751. Therefore, there are 0.751 moles of NaCl.
8. (1.23 x 10^24 molecules CO) * 1 mol CO/ (6.02 x 10^23) atoms = 2.043189369.
With sigs figs however, it rounds to 2.04. Therefore, there are 2.04 moles of CO.
9. (4.78 x 10^21 molecules O2) * 1 mol O2 / (6.02 x 10^23) atoms = 0.007940199.
With sigs figs however, it rounds to 0.00794. Therefore, there are 0.00794 moles of O2.
10. (9.50 x 10^22 atoms of C) * 1 mol C / (6.02 x 10^23) atoms = 0.157807309.
With sig figs however, it rounds to 0.158. Therefore, there are 0.158 moles of C.
Hope it helped! Did I explain better than your teacher?
Answer:
6. 13.8 moles
7. 0.751 moles
8. 2.04 moles
9. 0.00794 moles
10. 0.158 moles
Explanation:
How many moles of Zn are there in 4.50 x 1024 atoms?
Answer:
7.48 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{4.5 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 7.475083...[/tex]
We have the final answer as
7.48 molesHope this helps you
If the forest is left untouched, how will the forest change over time?
O The forest will remain unchanged.
O The forest will be repopulated by trees and eventually become a forest again.
The area will erode and remain without life.
O The area will become a completely different habitat such as a desert or plain.
Answer:
the answer is b and if your seeing this hope you have a good live
Explanation:
BBBB
Ron believes that a solar eclipse impacts the color of the moon because the moon causes the solar eclipse. Is his belief correct? Why or why not?
Answer:
A solar eclipse occurs when the moon gets between Earth and the sun, and the moon casts a shadow over Earth. A solar eclipse can only take place at the phase of new moon, when the moon passes directly between the sun and Earth and its shadows fall upon Earth's surface.
Explanation:
A mixture of hydrogen and oxygen gases has a total pressure of 5.50 atm. What is the partial pressure of the hydrogen if the P(O2) = 1250 mm Hg?
Answer:
P O 2 = 5.21 atm P C O 2 = 4.79 atm
Explanation:
Hope it helps!
-Identify the reactants and the
products. a.) carbon + oxygen --> carbon dioxide
b.) potassium + water --> potassium hydroxide +
hydrogen
Answer:
carbon dioxideis the product
potassium + water is the product
The lock and key model is used to explain how enzymes work. use this model to explain why an enzyme only works with a particular molecule?
Answer:
The lock and key model is used to explain how enzymes work.
Explanation:
An enzyme is a protein that functions as a biological catalyst . Enzymes are folded into complex shapes that allow smaller molecules to fit into them. The place where these molecules fit is called the active site.
The lock and key model was given by Emil Fischer in 1984 . According to this model the active sites of the enzymes have a specific geometric shapes wherein the substrate molecules fit in just like a key in a particular lock.
The lock and key model of an enzyme action is based upon structural complimentarity between the substrate molecule and the enzyme active site . Thus specific enzyme molecules will interact with specific substrate molecules only .
This specific action of an enzyme with a single substrate can be explained using lock and key analogy . In this analogy the lock is the enzyme and the key is the substrate . Only correctly sized key ( substrate ) fits into the key hole ( active site ) of the lock ( enzyme )
Find the wavelength of the electromagnetic radiation with a frequency of 3*10^ ^ -18 Hz *
Answer:
[tex]\lambda=10^{26}\ m[/tex]
Explanation:
It is given that,
The frequency of the electromagnetic radiation, [tex]\lambda=3\times 10^{-18}\ Hz[/tex]
We need to find the frequency of the electromagnetic radiation. The relation between the frequency and wavelength is given by :
[tex]c=f\lambda\\\\\lambda=\dfrac{c}{f}\\\\\lambda=\dfrac{3\times 10^8}{3\times 10^{-18}}\\\\=10^{26}\ m[/tex]
So, the wavelength of the electromagnetic radiation is [tex]10^{26}\ m[/tex].
The amplitude of a wave is
A. the distance between the crest and the trough of the wave
B. the distance the wave moves in one second
C. the distance equal to one wave length
D. the distance the wave moves in one time period of the wave
Answer:
the answer is A.
Explanation:
I hope this helps have a fantastic day!
Answer:
None of these
Explanation:
Amplitude is the distance from rest to crest.
Option A isn't the right answer
Option A is wavelength
The pattern of atoms and molecules give matter it’s ______
What is the blank?
Answer: Try mass that’s the best guess I can give off the top of my head
Explanation: An atom is the smallest unit of matter that retains all of the chemical properties of an element. Atoms come together which forms molecules. These molecules interact to form solids, gases, or liquids.
JJ thomson experiment the atomic theory?
Which statement about atoms during a chemical change is true?
Answer:
In a chemical reaction, only atoms are present in the reactant and can end up with molecules. No new atoms are created and no more atoms are destroyed. In a chemical reaction, reactants contact with each other and the bond between atoms in the reactant is broken and atoms rearrange and form new bonds to make the product.
Explanation: