How many moles are in 28.0 grams of H0? (Hint: molar mass of H20 is 18.015 g/mol)
1232.25 moles
o
1.55 moles
0.64 moles
O
57.21 moles
Answer:
1.55 moles if i am correct.
which one is ittt? help please:)
Answer:
b
Explanation:
the substance that can not be further decomposed by ordinary chemical means is
A.water
B.gold
C.sugar
D.air
If you roll a bowling ball and a marble at the same
speed, which one has more Kinetic Energy?
Answer:
The marble
Explanation:
Even though they both have kinetic energy, the marble has more since the weight of the bowling ball is heavier, leaving it to stop faster than the marble itself.
Match the following pls
Answer:
1 d
2 c
3 b
4 e
5 a
6.0x10^26 molecules of sodium hydroxide
Answer:
6E26
Explanation:
The electron has a negative charge.
True
False
Answer:
true :)
Explanation:
have a great day!!
How many electrons do nonmetal atoms tend to gain when forming ions?
A. One or two
B. A number equal to their number of valence electrons
C. Only one
D. Enough to fill their valence shell
Answer:
D
Explanation:
I got that right:)
Nonmetal atoms tend to gain enough electrons to fill their valence shell when forming ions.
What is an atom?
An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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Help please
What is the equation for density?
O D= m
OD=
m
m
D=
>le Els -
OD=ž
= { mu?
Answer:
It is this below
Explanation:
P = m/v
how many valence electrons does hydrogen have
Answer:
Since hydrogen is the first element, its electron configuration is 1s1.
Explanation:
It has only one electron in its valence shell.
Valence electrons are the outermost electrons or electrons in the largest energy level. Hydrogen has only one electron, so that electron is a valence electron.
Answer:
One valence electron !!
Explanation:
What force is necessary to accelerate a 1,200 kg car at a rate of 35 m/s2?
How much acceleration would the car have if a 30,600 N force was applied to
the car?
Explanation:
Given that,
Mass of a car, m = 1200 kg
Acceleration of the car, a = 35 m/s²
The force acting on the car is given by :
F = ma
F = 1200 kg × 35 m/s²
= 42000 N
If the force is 30,600 N, then acecleration is given by :
[tex]a=\dfrac{F}{m}\\\\a=\dfrac{30600}{1200}\\\\a=25.5\ m/s^2[/tex]
Hence, this is the required solution.
Kate and Janie are about to pour water into a beaker when they notice
the beaker has a crack at the bottom. What should the students do
with the beaker?
Answer:
Put the beaker in the broken glassware disposal and replace the beaker
Explanation:
Any beaker which has a crack could break/shatter if you apply heat. Also, cracked glassware is a lab safety hazard.
Which feature of the Galapagos Finch observed by Charles Darwin contributed to his theory of evolution?
1. feather color
2. wing shape
3. body size
4. beak size and shape
Answer:
Beak size and shape.
Explanation:
Can you help with this thanks
Answer:
Steam escapes from a teapot. Is a chemical reaction occurring? No, because liquid to gas would be a physical change, not a chemical change
Explanation:
HELP PLEASEEE!!!
If new information about the behavior of atoms is discovered and verified, then revisions will need to be made to the current _______.
Answer:
Atomic theory is. A
Explanation:
Subject to change if new information is discovered. B. A solution to the problem of differing isotopes. C. Unchanged able D. A descriptive table that lists all of the element
I hope this answered your question.
What do you think will happen if you put it above the tube that is over the hot soil?
Answer:
what is "it"
Explanation:
if it's a liquid it will boil
if it's a chemical it could burn or catch on fire
Give an example of a formula of an ionic compound and explain why the formula is ionic.
Please can someone help???
Answer:
NaCl
The overall ionic formula for a compound must be electrically neutral, meaning it has no charge.
When writing the formula for the ionic compound, the cation comes first, followed by the anion, both with numeric subscripts to indicate the number of atoms of each.
ions are formed when metals are combined with nonmetals
Identify the type of reaction
CaCl2 + AgNO3 --> AgCl + Ca(NO3)2
Answer:
It is Double Replacment
Explanation:
They traded bonds.
Balanced Equation is 2AgNO3 + CaCl2 = 2 AgCl +1Ca(NO3)2
Elements in the same period have the same number of
Which one ?
1.valence electrons
2.protons
3.Neutrons
4.orbits
Answer: Protons
Explanation:
Put the following elements in order of increasing first ionization energy (lowest to highest): S, Ca, Mg,
CI
Answer: Ca, Mg, S, Cl
Explanation: general trends are IE increases as the number of electrons in the outermost shell, and decreases as the number of shells (and shielding effect) increases.
S outer 6, shells 3
Ca outer 2, shells 4
Mg outer 2, shells 3
Cl outer 7, shells 3
Ca has 2 outer, 4 shells —> lowest
others have 3shells
Mg 2outer, S 6, Cl 7
I need help with question 4!!!!!!!
*Please choose correctly*
Thank youuuu
Answer:
hshzjndbejkxn. znkskakannamzm msk
What’s Neon family number? And period?
Answer:
18 and Period 2
Explanation:
Neon (Ne), chemical element, inert gas of Group 18
Neons period on the periodic table is period 2.
39. Consider the following molecules:
(a) H2O
(c) CO2
(e) CC14
(b) NHA
(d) CIF
(i) In which compound are the bonds most polar?
(ii) Which compounds in the list are not polar?
(iii) Which atom in CIF is more negatively charged?
please help as soon and best answer gets brainlest
Answer:
Mass, temperature, and phase.
I think temperature because the higher the temperature of a given quantity of a substance, more is its thermal energy. Similarly, for the same temperature, higher mass of a substance will contain more thermal energy.
Examples of polar molecules
Answer:
Water, Ethonal, Ammonia, Sulfur Dioxide, and hydrogen sulfide.
The answers are in the picture. this us the question, An increase in carbon dioxide production has led to an increase in global temperatures, which is causing glaciers to melt faster. If this trend continues, how will animals living in the polar regions be affected?
Answer:
D
Explanation:
because if there is no land for them they wont survive in only water
The increase in global temperature melts the ice in polar regions. This worsely affects the animals living there. Hence, they will migrate to other areas but this is in fact not possible for their adaptation in other areas and they may subject to extinction.
What is global warming ?Global warming is the rise of temperature of earth surface all over the world. The significant reason for global warming is green house effect. Gases like carbon dioxide, methane gas etc. are intensely absorbing temperature that is radiating back from earth.
Hence, these gases are increasing the atmospheric temperature in earth. Global warming have very serious impacts that going up to the major discussion to solve nowadays.
The melting of polar icebergs and rising of sea level definitely leads to the extinction of animals living in polar region. They cant be adopted to other regions and migrating to other areas does not save them. Hence, they will extinct from earth. Therefore, option d is correct.
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when a coil of wire is connected to a batter, an electric current flows through it. True or False
Answer:
True i think.
Explanation:
How many electrons are being shared between the two carbon atoms in the covalent compound ethyne? Ethyne has the structure: H−C≡C−H
Answer:
Three lines between the carbon atoms in the Lewis structure represent three covalent bonds. Each covalent bond is a shared pair of electrons, hence there are six electrons being shared between the carbon atoms in ethyne.
The number of electrons that are being shared between the two carbon atoms in the covalent compound ethyne is six.
What are covalent bonds?Covalent bond are formed by the sharing of electrons between two atoms.
In ethyne molecule two carbon atoms are present and between two carbon atoms three covalent bonds are present. And each covalent bond is formed by the sharing of two electrons. So three covalent bonds are formed by the sharing of 6 electrons.
Hence in ethyne 6 electrons are being shared.
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A meteor is moving 468 km per minute traveling in a south-to-north direction passed near Earth in 2013. Does this statement describe the meteors speed or velocity?
Answer:
it's describes the velocity. since a direction was specifically given, that means it is displacement, and displacement is to velocity while distance is to speed
Answer:
since a direction was specifically given, that means it is displacement, and displacement is to velocity while distance is to speed
Explanation:
I'm lyrics texting my crush and want to know what song i should do
Answer: mine by bazzie
jus' gonna tell you how i feel (look)
you so focking precious when you smile (heh,yeah)
hit it from the back and drive you wild, oh yeah
girl/boy, lose myself in those eyess
i just had to let you know you're mineee