Answer:
Explanation:
In a neutral atom, the atomic and ionic radius is the same, but many elements exist as anions or cations. If the atom loses its outermost electron (positively charged or cation), the ionic radius is smaller than the atomic radius because the atom loses an electron energy shell
Which of the following is a main group element?
O Ce
O Co
O Cu
OCs
O none of the above
Why were Democritus's ideas not science?
Answer:
Im not sure because you might have spelled a word wrong.But i believe because of their certain treaditions,belifs,and ways.
Explanation:
__
19. SC.912.L.18.12
The picture below shows a group of water skate bugs "walking on the surface of a pond. When an
insect lands or falls into the water, the water molecules vibrate. The water skater uses the resulting
vibrations to find its prey. What property of water enables this bug to stay on the surface of the pond
and not sink?
a. Water's high specific heat enhances the vibrations causing the bugs to float.
b. An optimum pH of the pond water, keeps the water calm so that the bugs don't
sink.
C. The hydrogen atoms, in the water, bond to the bugs' legs keeping the bugs on the
surface.
d. Hydrogen bonds provide cohesion of the water molecules enabling the bugs to stay
afloat.
Answer: Hydrogen bonds provide cohesion of the water molecules enabling the bugs to stay
afloat.
Explanation: Hope it helps :)
Hydrogen bonds provide cohesion of the water molecules enabling the bugs to stay.
Water:
The Earth is made up of 75% water. river, lakes, sea are some of the sources of water. Hydrogen bonds between the water molecules help to bind the molecules together.
Water molecules has cohesive property, due to this cohesive property all the hydrogen molecules bugs can easily afloat on surface of water.
There are the two types of properties such as cohesion and adhesion. Cohesion allows insects to walk.
Option C is the correct answer.
Therefore, Hydrogen bonds provide cohesion of the water molecules enabling the bugs to stay.
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Make a list of characteristics that all waves have in common
Answer:
sound waves, light waves, radio waves, microwaves and others
Explanation:
these waves have the same fundamental properties of reflection ,refraction, diffraction and interference, and all waves have a wavelength, frequency, speed and amplitude
1) How much heat is needed to
melt 5.40 grams of ice at its
melting point?
answer: heat needed=18,300
expanation
What is a common event due to transform plate movement at the San Andreas Fault Zone?
Answer:
Earthquakes
Explanation:
took the test
Answer:
earthquake
Explanation:
me and that other guy took the test
ASAP MULTIPLE CHOICE WILL MARK BRAINLIEST
Which term is defined as the mass of an atom based on the mass of an atom of carbon-12?
atomic charge
atomic mass
isotope
atomic number
Answer: atomic mass
Explanation: Mass is equal to one twelfth the mass of an atom of carbon-12
Which type of force caused the weight to drop (11) after the rope was cut?
Friction Force
Normal Force
Applied Force
Electrical Force
Gravitational Force
Magnetic Force
Answer:
gravitational force.
A balloon has a volume of 6.25 L at 453 kPa. What would the volume of this balloon be at 325 kPa?
Answer:
4.48 L
Explanation:
P1/V1 = P2/V2
453/6.25 = 325/ x
453x = 6.25*325
x = (6.25*325)/453
x = 4.48 L
Describe the relationship between a boiling point and hydrogen bonds in a substance.
Hydrogen bonding between molecules(inter mlecular) is one such attractive force. ... In water because of the hydrogen bonding attraction between molecules greater energy is needed to separate them from against their inter molecular attraction, therefore higher boiling point.
The boiling points of molecules with hydrogen bonds will always be higher than those of molecules of similar size without an -O-H or -N-H group.
What is hydrogen bonding ?
When a hydrogen atom bonded to a strongly electronegative atom is in close proximity to another electronegative atom with a single pair of electrons, the hydrogen bond is an intermolecular force (IMF) that results in a unique type of dipole-dipole attraction. There are forces between molecules called IMFs. Dipole-dipole interactions and dispersion forces are two additional examples. While true covalent and ionic bonds are stronger than hydrogen bonds, dipole-dipole and dispersion forces are generally weaker.An organic molecule with an -OH group is called an alcohol. Hydrogen bonds can occur in any molecule that has a hydrogen atom directly attached to an oxygen or nitrogen. When hydrogen is bonded to fluorine, hydrogen bonds also occur, but other molecules lack the HF group. The molecules become as a result of the hydrogen bonding, requiring more heat (energy) to separate. The boiling point of various molecules, which is the temperature at which a phase change from liquid to gas takes place, can be examined using this phenomenon.The ethanol's hydrogen bonding has raised its boiling point by about 100°C. It is essential to comprehend that van der Waals attractions are not the only forms of hydrogen bonding. For instance, each of the molecules that follow has the same number of electrons, and the two that follow have chain lengths that are comparable. Because of the additional hydrogen bonds, the butan-1-ol has a higher boiling point.To know more about hydrogen bonding check this:
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Does a clock have internal organization.
Answer:
yes
Explanation:
Write the products of these double-replacement reaction. Then balance each equation. Ba(NO3)2 (aq) + H3PO4 (aq) ---> Barium phosphate is a precipitate)
Answer:
Explanation:
Step 1: RxN
Ba(NO₃)₂ (aq) + H₃PO₄ (aq) → Ba₃(PO₄)₂ (s) + HNO₃ (aq)
Step 2: Balance RxN
We need 3 Ba's on both sides.
We need 2 PO₄'s on both sides.
3Ba(NO₃)₂ (aq) + 2H₃PO₄ (aq) → Ba₃(PO₄)₂ (s) + 6HNO₃ (aq)
What compounds would you use for a ceramic baking dish
LOOK AT THE IMAGE ABOVE CAN SOMEONE PLEASE DO IT WITH FULL STEPS PLEASE I NEED IT TODAY PLEASE PLEASE I WILL MARK YOU BRAINLIST
answer:
IMAGE IS SUPER UNCLEAR SORRY LUV <3
explanation:
your phone must me from 2009 with that trash camera quality sweetie i suggest you get a new one... oh wait you can't you're broke :(
What will most likely happen in the absence of a nucleus?
Answer:
Nucleus is the brain of the cell and controls most of its functions. Thus without a nucleus, an animal cell or eukaryotic cell will die.
Answer:
A. genetic information will not be transmitted by the cell
Explanation:
If an atom is neutrally charged the number of electrons equals
Answer:
The number of protons
Explanation:
Answer:
number of negative electric charger
explanation
(the electrons ) and positive electric charges (the protons). The total electric charge of the atom is therefore zero and the atom is said to be neutral .
Why is it more difficult to cause photons to be emitted from neon
Answer:
Neon is a noble gas
Explanation:
It is important to note that the excitation energy of even the lowest excited states of noble gases is greater than the ionization energy of many atoms of other elements.
This is because, the electrons in a noble gas are contained in a filled shell with greater stability than the the atoms of other elements.
Hence, it becomes difficult to excite the neon atom to a higher energy level.
Recall that photons are emitted when atoms of elements return to ground state after being excited to higher energy level.
Since it is difficult to excite neon, it is also difficult to cause photons to be emitted from neon.
Some oxides are given below. (i)Na2O (ii)NO2 (iii) CO2 (iv) MgO a) Which are the basic oxides among these? b) What is the name of the aqueous solution of CO2 ?
Basic oxides ⇒ metal(usually alkali/alkaline earth) +O₂
L + O₂ ⇒ L₂O
L + O₂ ⇒ LO
Dissolve in water becomes = basic solution
L₂O+H₂O⇒ 2LOH
LO + H₂O⇒ L(OH)₂
So the basic oxides : Na₂O and MgO
Na₂O + H₂O⇒NaOH
MgO +H₂O⇒Mg(OH)₂
The aqueous solution of CO₂(dissolve in water)
CO₂ + +H₂O⇒ H₂CO₃(carbonic acid)
Which of the following is the sun responsible for?
A-Earth’s magnetic field
B-Earth’s temperature
C-Earth’s atmosphere
D-Earth’s rotation
Answer:
Im pretty sure it is B. Earths temperature
Explanation:
Is there a common pattern for valence electrons on the periodic table
Answer:
For neutral atoms, the number of valence electrons is equal to the atom's main group number. The main group number for an element can be found from its column on the periodic table. For example, carbon is in group 4 and has 4 valence electrons. Oxygen is in group 6 and has 6 valence electrons.
Explanation:
An amoeba is a one-celled organism. The cell theory states that which of the following characteristics of amoebas must be true?All amoebas have a regular, spherical shape.All amoebas move rapidly using a cilia.All amoebas have organelles called chloroplasts.All amoebas come from other amoebas.
Answer:
I believe the answer is all amoeba come from other amoeba
differentiate homogeneous and heterogeneous mixtures
Answer:
HOMOgeneous = Same/Alike
HETEROgeneous = Diversity/Different
In mixtures:
Homogeneous would be defined as the evenly proportion substance/materials placed throughout the sample, while heterogeneous is the maintain of separate materials/substances throughout the sample.
Write the products of these double-replacement reaction. Then balance each equation. a) NaOH(aq) + Fe(NO3)3 (aq)---> Iron (III) hydroxide is a precipitate
Answer:
3NaOH (aq) + Fe(NO₃)₃ (aq) → Fe(OH)₃ (s) + 3NaNO₃ (aq)
Explanation:
Step 1: RxN
NaOH (aq) + Fe(NO₃)₃ (aq) → Fe(OH)₃ (s) + NaNO₃ (aq)
Step 2: Balance RxN
We need 3 OH's on both sides.
We also need 3 NO₃'s on both side.
This will make it so we also need 3 Na's on both side3NaOH (aq) + Fe(NO₃)₃ (aq) → Fe(OH)₃ (s) + 3NaNO₃ (aq)
ASAP MULTIPLE CHOICE WILL MARK BRAINLIEST
An atom of rubidium has 37 protons and 48 neutrons. The atom loses one electron.
What will be the charge on the ion that forms?
36
+1
−36
−1
Answer:
+1
Explanation:
Answer:
-136Step-by-step explanation:
"Loses" means subtraction, decrease, or negative. So, a loss of 1, can also be represented by -1.If protons and electrons can be represented by the same number (37), then a loss of 1 is just, 37 - 1. 37 - 1 = 36.I hope this helps!
help help help help help help help help help help help help help help help help help
Answer:
Your answer would be B. Have a wonderful day!
Explanation:
Answer:
Answer is B
Explanation:
5. Explain the difference between a molecular
element and a molecular compound.
Answer:
is that in a molecule of an element, all the atoms are the same. For example, in a molecule of water (a compound), there is one oxygen atom and two hydrogen atoms. But in a molecule of oxygen (an element), both of the atoms are oxygen.
Explanation:
Answer:
The only difference between a molecule of a compound and a molecule of an element is that in a molecule of an element all the atoms are the same.
Explanation: A molecule of an element all the atoms are the same.
A new scam on the Internet involves people selling samples of sodium that they collected from a secret river in the mountains. Write a short statement to explain why this is a scam.
Answer:
Explanation:
The reason this is a scam is because they are selling sodium and to sell this product you must have a licence to do so. And secondly, you cant tell the reader that it is from a secret river and sell them a product that reacts when it touches water.
Sodium is a very highly reactive metal that does not occur in free state in nature.
Sodium is a group 1 element. It has a very negative electrode potential which implies that it is highly reactive. Being a highly reactive element, sodium can not occur in free state in nature. It always occurs in combined form as compounds.
Hence, it is impossible to pick up sodium from any secret river in the mountains. Sodium metal is highly reactive hence it has to be stored under paraffin oil. The whole set up is indeed a scam.
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Who described the atom as being like plum pudding?
A) Robert Millikan
B) J. J. Thomson
C) Niels Bohr
D) Ernest Rutherford
Answer:
B
Explanation:
J.J. Thomson
The plum pudding model is an early 20th century model of an atom. It was later found to be wrong. It was proposed by J.J. Thomson in 1904, after the electron had been discovered, but before the atomic nucleus was discovered.
Calculate the mass of 0.5 moles of Co2
And 5 moles of h20
Answer:
Mass of 0.5 moles CO2 is 22 and Mass of 5 moles of H2O is 90
Explanation:
Moles = [tex]\frac{GivenMass}{Molecular Mass}[/tex]
so value of moles is given 0.5 for co2 and 5 for h2o and the molecular mass of co2 is 44 and h2o is 18 so we put these values in
Mass = Moles x Molecular Mass
and we get the answer
to make an aqueous solution of 0.223 M magnesium bromide, using a 250 mL volumetric flask. How much solid magnesium bromide should you add?
Answer:
Ok
Explanation: