Answer:
Calcium has a charge of positive 2 not negative
Explanation:
The day to day condition of atmosphere is known as
A) climate
B) weather
C) climactic zone
D) atmosphere pressure
Answer:
d) atmosphere pressure
Answer:
B.) weather
Explanation:
weather is constantly changing everyday and each day presents a new condition:)
2) Convert 2.65*10^ ^ 25 atoms of Chlorine to moles of CI
Answer:
22 mol
Explanation:
Given data:
Number of atoms of Cl = 2.65×10²⁵ atom
Number of moles of Cl = ?
Solution:
The given problem will solve by using 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. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
2.65×10²⁵ atom × 1 mol / 6.022 × 10²³ atoms
0.44×10² mol
22 mol
Difference between absolute atomic mass and relative atomic mass with example
“Atomic mass” is relative to the isotope carbon-12 weighing exactly 12 atomic mass units. Therefore “atomic mass” is precisely the same as “relative atomic mass.”
Two further points:
First, atomic mass as stated on the periodic table is a average of the masses of an element’s naturally-occurring isotopes, weighted by their abundance. This is because atomic mass as normally used is a bulk property: we weigh out many trillions of atoms at a time, because we usually deal in macroscopic quantities. And that means that an average mass is more useful to us.
Second, all masses are relative masses (until the new, physical-constant-based kilogram comes online; and arguably even then). We mass something by comparing it to some standard of reference: until later this year, that something is a chunk of alloy in Paris, France. When the new standard comes into use, we will be comparing the kilogram’s gravitational mass to the strength of the electromagnetic force.
But that’s kind of trivial; it just stems from the fact that any and every measurement is a comparison to something else.
Edit: IUPAC, the world’s premier organization for the imposition of picky definitions that most people never need to use, has the following:
Atomic mass is the mass of a single atom; the unit is the Dalton or unified atomic mass unit. (I would use “isotopic mass” to specify the mass of a particular atom, but that’s not sanctioned by IUPAC.)
Relative atomic mass is the measured average mass of all atoms of a particular element in a particular sample. To make it unitless, it’s divided by the value of the unified atomic mass unit.
Standard atomic weight is the value you read off of the periodic table; it’s an Earth-based average over many samples, of experimental values of the relative atomic mass. Values are promulgated by the IUPAC Commission on Atomic Weights and Isotopic Abundances, and are revised every two years.
Most chemists refer to standard atomic weight as “atomic mass” or “atomic weight” and get on with their lives.
The unified atomic mass unit is 1/12 of the mass of an atom of carbon-12. It is sometimes called the Dalton.
Definitions taken from the IUPAC Gold Book.
As far as I can tell, relative atomic masses and standard atomic weights are made unitless so that they can be used with any convenient macroscopic mass unit to determine correct proportions for a desired chemical reaction.
How many electrons surround the
nucleus of an atom of Thallium?
Answer:
81
Explanation:
PLEASE HELP!!!
Mixed Naming Worksheet – Ionic, Covalent and Acids
Directions: Be sure to determine what type of compound your substance is – ionic, binary, covalent or an acid. Naming Compounds
1. NO2 - Covalent
2. NaBr - Ionic
3. SiO2 -
4. P2Br4
5. FeSO4
6. SF6
7. HNO3
8. Li2S
9. HCl
10. MgBr2
What element is found in liver and is needed to prevent anemia or “tired” blood?
Answer:
Iron (Fe)
Explanation:
write a balanced chemical equation for the reaction between iron and hydrochloric acid?and explain the foul smell
Answer:
Fe(s) + 2(H+ , Cl-)(aq) → (Fe2+ , 2Cl-)(aq) + H2(g)
Explanation:
HELP PLEASE
Which expression is equivalent to (5x^3)(2x)^2 ?
A 10x^6
B 30x^6
C 40x^6
D 1,000x^12
Answer:
C
Explanation:
PLease help I need to get this test done and whoever helps first I will mark brainliest Love you!!!!!
Answer:
moon
Explanation:
Answer:
Explanation:
its the moon. the moon covers the sun causing it to be completely blakened out. and if thats not right then lifes a lie cuz i got blinded pretty bad in one of my eyes for looking at it with it
Which organelle is like the brain of the cell?
vacuole
endoplasmic reticulum
cytoplasm
nucleus
Answer:
nucleus
Explanation:
Answer:
The nucleus
Explanation:
The nucleus can be thought of as the brains of a cell.
-CancerQuest
Use Boyle's Law to solve this problem: A gas has a volume of 10.0 L at a pressure of 4.0 atm. If the gas expands to 20.0 L, what will be the new volume, assuming that there is no change in moles or temperature.
Answer:
P₂ = 2 atm
Explanation:
Given data:
Initial volume = 10.0 L
Initial pressure = 4.0 atm
Final volume = 20.0 L
Final pressure = ?
Solution:
The given problem will be solved through the Boly's law,
"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"
Mathematical expression:
P₁V₁ = P₂V₂
P₁ = Initial pressure
V₁ = initial volume
P₂ = final pressure
V₂ = final volume
Now we will put the values in formula,
P₁V₁ = P₂V₂
4.0 atm × 10.0 L = P₂ × 20.0 L
P₂ = 40.0 atm. L/ 20.0 L
P₂ = 2 atm
How many molecules
are there in 220 grams
of CF.?
Answer:
Answer. There are 1.5×1024 molecules in 220 g CF4 .
A student was assigned to take water samples from a lake near his home he measured the Ph of one of the water samples to be 6.0. which of the following best describes this sample of water
Highly acidic
Slightly acidic
Highly basic
Slightly basic
Answer:
B. Slightly acidic
Explanation:
pH can be defined as a measure of the negative logarithmic concentration of hydrogen ion (H+) in an aqueous solution.
Basically, the pH scale is used to measure the level of acidity or basicity of an aqueous solution based on a scale of 0 to 14.
An acidic solution has a pH lower than 7 (0 - 6), a basic solution has a pH higher than 7 (7 - 14) and a neutral solution has a pH of exactly 7.
In this scenario, a student was assigned to take water samples from a lake near his home he measured the Ph of one of the water samples to be 6.0. Therefore, this sample of water can be said to be slightly acidic its pH is slightly below 7.
Ammonia is a covalent bonded compound because... I need helpppp!!!!
What happen when molten zinc bromide is electrolysised
Answer:
Molten lead bromide, PbBr 2(l), is an electrolyte. During electrolysis: Pb 2+ ions gain electrons at the cathode and become Pb atoms. Br - ions lose electrons at the anode and become Br atoms, which pair up to form Br 2 molecules.
Explanation:
hope it helps
Is H20 > H2 + O2 a balanced equation?
Answer:
No
Explanation:
H2O > H2 + O2
There is an uneven amount of oxygen on the right side
it will look like this balanced:
2H2O(l) > 2H2(g) + O2(g)
on plato
Which sphere includes rocks and minerals?
A.
atmosphere
B.
biosphere
C.
geosphere
D.
hydrosphere
Answer:
c. Geosphere
Explanation:
thats it hope this will help
Answer:
The answer is C- Geosphere.
Explanation:
I just took the test and got it right.
The word Geo means earth and it's rocks and minerals.
Hope this helps! (:
How many moles of water are needed to react to produce 5.0 moles of sodium hydroxide?
*Your answer should be written as XX
Na2O + H20 --> 2 NaOH
Answer:
2,5
Explanation:
Solution at attachment box
Producted or consumed material proportional with coefficient of material at reax.
If an atom has 15 protons, 12 neutrons, and 19 electrons, what is the atom's electrical charge? A. -7 B. +7 C. +3 D. -4
Where is there higher air pressure, above the land or above the water?
Answer:
The air above land also warms faster than air above the sea. Cooler higher pressure air above the ocean moves toward warmer lower pressue air above land.
Answer:
Use the sources to help you, but I would say above the water.
Explanation:
"However, water heats up much more slowly than land and so the air above the land will be warmer compared to the air over the ocean. The warm air over the land will rise throughout the day, causing low pressure at the surface. Over the water, high surface pressure will form because of the colder air."
AND
"The depth (distance from top to bottom) of the atmosphere is greatest at sea level and decreases at higher altitudes. With greater depth of the atmosphere, more air is pressing down from above. Therefore, air pressure is greatest at sea level and falls with increasing altitude."
I hope this helps you!
If 14.8 L of ammonia (NH3) are collected at STP, how many moles of water have reacted?
__ mol H20
Li3N(S) + 3 H20(1) --> NH3(g) + 3 LiOH(aq)
**Report your answer to the correct number of significant digits!
Answer: what is it I need help
Explanation: step by step
Answer:
First you need to get liters to moles to mass. So 14.8 times 1 mol over 22.4 times the mole ratio 1:3 times molar mass over one mol. There you have it. Sorry I haven’t solved it yet and don’t know the right answer as soon as I do know I’ll edit this and say the correct answer
Explanation:
What are three elements in the same period
Explanation:
lithium hydrogen sodium oxygen
Molar mass
18 Calculate the molar mass of lead element, knowing that the mass of 0.2 mol
of it equals 41.4 g
Answer:
207g/mol
Explanation:
Given parameters:
Mass of the lead = 41.4g
Number of moles = 0.2mole
Unknown:
Molar mass of lead = ?
Solution:
The molar mass of substance is related to mass and number of moles using the expression below;
Mass = number of moles x molar mass
Molar mass = [tex]\frac{mass}{number of moles }[/tex]
Now insert the parameters and find the molar mass;
Molar mass = [tex]\frac{41.4}{0.2}[/tex] = 207g/mol
Which has the highest boiling point?
natural gas
lubricating oil
gasoline
kerosene
fuel oil
Answer:
lubricating oil
Explanation:
Of the given fractions, lubricating oil has the highest boiling point of all.
It is a petroleum fraction used for lubrication and reducing friction between moving parts of machineries .
Lubricating oil is a heavier fraction of oil. Heavier fractions of oil usually have higher boiling points. Natural gas and gasoline are lighter fractions. They are the first set of fractions to come out in distillation column.Step 4: Measuring the Volume of Air Near 0°C
°C
Temperature of gas:
Height of the column of gas.
cm DONE
Temperature of gas
Answer:
Temperature of gas: 3 Celsius
Temperature of gas: 276 K
Height of the column gas: 5.7 c.m
Volume of gas (V=TTr^2h):cm^3: 0.72
Explanation:
There is a pictucre below to help also
Hopes this helps
Answer:
I hope this helps!
Explanation:
Where does the chemical energy to produce ATP come from
Answer:
glucose
Explanation:
Chemical energy is stored in the bonds that hold the molecule together. ADP can be recycled into ATP when more energy becomes available. The energy to make ATP comes from glucose. Cells convert glucose to ATP in a process called cellular respiration.
The chemical energy to produce ATP comes from the BREAKDOWN of carbon-based molecules into smaller molecules.
Cellular respiration is a series of metabolic reactions by which eukaryotic cells produce energy in the form of ATP by using the energy stored in the chemical bonds of carbon-based molecules.These reactions are catabolic reactions in which chemical bonds of larger molecules are broken down, thereby releasing energy. These carbon-based molecules are glucose and fats (lipids).Carbohydrates release 4000 calories (cal) per gram when they are burned during cellular respiration.Conversely, fats (lipids) release approximately 9000 cal per gram when they are burned.In conclusion, the chemical energy to produce ATP comes from the BREAKDOWN of carbon-based molecules into smaller molecules.
Learn more in:
https://brainly.com/question/10253095
Please answer these two questions ASAP. Thanks.
Answer:
Speed and 0, at starting point
Answer:
Speed
0,at the starting point
Please answer as fast as possible
1. density of liquid: 1 g/cm³
2. density of unknown liquid: 2.7 g/cm³
Further explanationDensity is a quantity derived from the mass and volume
Density is the ratio of mass per unit volume
The unit of density can be expressed in g/cm³ or kg/m³
Density formula:
[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]
ρ = density
m = mass
v = volume
1
.[tex]\tt \dfrac{156-56}{100}=1~g/cm^3[/tex]
2.[tex]\tt \dfrac{27}{(\dfrac{30-20}{1}) }=2.7~g/cm^3[/tex]
Help This is due in 30 mins! PLEASE?
What climate condition occurs during El Niño?
dry heat throughout North America
warm water moving toward the coast of South America
heavy rain moving toward the coast of South America
flooding throughout North America
Answer:
flooding throughout North America
Explanation:
An El Niño condition occurs when surface water in the equatorial Pacific becomes warmer than average and east winds blow weaker than normal. The opposite condition is called La Niña. During this phase of ENSO, the water is cooler than normal and the east winds are stronger. El Niños typically occur every 3 to 5 years.
Hope this helps
Answer:
warm water moving towards the coast of South America
Before we can use gasoline in our cars, the crude oil needs to be separated into separate products like plastics and ink. This process is called
Answer:
Fractional distillation
Explanation:
Crude oil, also known as petroleum, is a naturally occurring substance found in the Earth's crust. It is a mixture of different useful substances. These substances are separated from one another based on their individual boiling points in a process called FRACTIONAL DISTILLATION.
The process of fractional distillation entails the application of heat to the crude oil. The different fractions evaporate and condense in the fractionating column depending on their boiling point. The hydrocarbon substances separated are called fractions, and they include bitumen, diesel, kerosene, gasoline, natural gas etc. Therefore, before we can use gasoline (petrol) in our cars, the crude oil needs to be separated into separate products like plastics and ink. This process is called FRACTIONAL DISTILLATION.