Answer:
Explanation:
Copernicus proposed that the Earth is not the center of the solar system, and that the Sun is the center. It's called heliocentric. He wrote a book summarizing all his ideas called De Revolutionbus. The Copernican Revolution though, is when a majority of the people started taking his ideas seriously and a major shift happened in what people think about the solar system.
Answer:the discovery that the earth revolves around the sun
Explanation:
What do sodium and magnesium have in common?
Answer:
daddy will help
Explanation:
uhhhhhhhhhhhhhhhhhhh
The current temperature in Atlanta, Georgia is 24°C. What is this temperature in Kelvin?
Answer:
297.15kelvin is the correct answer
Answer:297 k
Explanation:
Can someone answer this question please. Is this a physical change or chemical change?
Answer:
Chemical
Explanation:
the acid is a chemical and the molecules are getting torn apart by the acid
Solve the equation by first using the Quadratic Formula and then by factoring.
x2 – 14x + 48 = 0
How many moles of tin atoms are in a pure tin cup with a mass of 30.4 g ?
Answer:
ANSWER: 0.331 moles of tin
Explanation: in my working * means multiply and ^ means to the power of.
Ok BASICALLY if you have 6.02*10^23 of something you have yourself 1 mole of things. The atomic weight in the left hand corner of each element in the periodic table gives you the MOLAR MASS, which is the mass of 1 mole of that element. For example, Carbon has a molar mass of 12.011, this means it has 12.011 grams every 1 mole of carbon [C] (12.011 g/mol)
So now, how many moles are in 39.3 grams of tin? Very easy. You will find that in chemistry classes students are taught a basic formula to find the number of moles, which is:
---
Number of moles = Mass given / Molar mass
---
So in order to answer this question and find out the NUMBER OF MOLES, we need to find the MASS GIVEN - this is simply the mass given to you in the question, which is 39.3 grams of tin. We also need to know the MOLAR MASS, which is found in the left hand corner of the element. For tin [Sn] the molar mass is 118.710.
Sub both these into the formula to get:
Number of moles = 39.3 / 118.710
Number of moles = 0.331058883
We are not finished - remember to round of the lowest amount of significant figures found in the working of the question. In the working out, which was (39.3 / 118.71) the 39.3 has 3 significant figures and the 118.70 has 5 significant figures. ALWAYS TAKE THE LOWEST AMOUNT FOUND. The lowest amount is 3, so we must round this answer to 3 significant figures.
It will be: 0.331
Therefore, 0.331 moles of tin atoms are in a pure tin cup with a mass of 39.3.
Hope i helped and good luck!
How many square centimeters are in an area of 8.20 inch2 ? Express your answer numerically in square centimeters.
Answer:
52.9031 hope this helps:)
Explanation:
Radioactivity is a random Process, Why?
Explanation:
Radioactive decay is the set of various processes by which unstable atomic nuclei (nuclides) emit subatomic particles (radiation). Decay is said to occur in the parent nucleus and produces a daughter nucleus. This is a random process, i.e. it is impossible to predict the decay of individual atoms.
HOPE THSI HELPS HAVE A NICE DAY!
What is the main purpose of the curiosity rover ?
Answer:
What is the main purpose of the curiosity rover ?
Explanation:
Curiosity's mission is to determine whether the Red Planet ever was, or is, habitable to microbial life. The rover, which is about the size of a MINI Cooper, is equipped with 17 cameras and a robotic arm containing a suite of specialized laboratory-like tools and instruments.
Answer:
Curiosity's mission is to determine whether the Red Planet ever was, or is, habitable to microbial life. The rover, which is about the size of a MINI Cooper, is equipped with 17 cameras and a robotic arm containing a suite of specialized laboratory-like tools and instruments.
need help plz asap .......
Answer:
Purple flowers
Explanation:
Usually the dominant allele is a capital letter.
From the question, purple flowers are dominant to white flowers while white are recessive.
PP = Purple
pp = White
Answer:
Mostly purple flowers itself
2. How might this population suddenly increase? How might this affect the ecosystem? (for tropical savannah.)
Explanation:
it can suddenly increase when more and more people have babies and the infant rate goes up. and how it might affect the ecosystem is the pollution that people give off.
Answer:
Explanation:
Due to less predators in the Savannah/habitat, the population could unexpectedly grow. This will have an impact on the environment because it will give rise to more prey as there will be fewer predators. If too many herbivores are present on one feeding site, competition for food will occur. If there are more plants in an area than normal, it can increase the population of animals that consume the plant. If the population of one animal rises, the population of animals that consume that animal could also rise.
Population growth isn't always good. A population may often grow too big to sustain the climate. Other modifications in limiting variables can cause a population to decline. The population will decrease if a population becomes diseased, and the population of animals that consume the diseased animals will decrease as well. Populations in nature typically balance themselves. Sometimes, they can't always restore a natural balance as man affects populations.
How many moles of O2 are made from 4 moles of H2O
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Q
1
The process by plant cells to use sunlight to create glucose is called Photosynthesi, cellular, active, passive, or osmosis
Answer:
PHOTOSYNTHESIS
Explanation:
Photosynthesis is the process by which plant take in Carbondioxde and water in the present of sunlight in order to produce glucose and oxygen
Pleas answer ASAP!! If the empirical formula of an organic compound is CH2O then the molecular mass of the compound could be? 15 grams 45 grams 60 grams 135 grams
Answer:
uhh 60??
Explanation:
The molecular mass of the compound could be 60g, the correct option is option c among all the given options.
What is molecular mass?The weight of a molecule is measured by its molecular mass. Atomic weight is another name for it. It usually involves multiplying the total mass of all the atoms in the molecule by the overall number of the element's atoms.
For instance, there are two hydrogen atoms and one oxygen atom in water. The atomic weight of oxygen multiplied by two or more to get the typical hydrogen atomic mass gives the water molecule its mass. The atoms that make up the molecule are what determine an element's molecular mass.
Empirical formula is CH[tex]_2[/tex]O
Mass of Empirical formula =12+12+16=30g
Vapour density = Molar mass of compound/2
30= Molar mass/2
Molar mass of compound =60g
Therefore, the molecular mass of the compound could be 60g, the correct option is option c among all the given options.
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how do plants release carbon into the atmosphere
Answer:
Plants release more carbon dioxide into atmosphere than expected. ... Plants use photosynthesis to capture carbon dioxide and then release half of it into the atmosphere through respiration. Plants also release oxygen into the atmosphere through photosynthesishesis to capture carbon dioxide and then release half of it into the atmosphere through respiration. Plants also release oxygen into the atmosphere through photosynthesis.
I have the smallest atomic number of all the
elements that have electrons in three different
energy levels. Who am I?
The element with the smallest atomic number is hydrogen
What is atomic number?
A chemical element's atomic number is its position in the periodic system, which places the elements in ascending order of the number of protons in their nuclei. As a result, the atomic number is also determined by the number of protons, which is always equal to the number of electrons in a neutral atom.
The charge number of an atomic nucleus is the chemical element's atomic number, also known as nuclear charge number. This is the number of protons present in the nucleus of each atom of that element, or the proton number, for conventional nuclei. The atomic number of common chemical elements can be used to uniquely identify certain elements.
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For each element write the Noble gas notation
1. Oxygen
2. Calcium
3. Hydrogen
4. Copper
5. Neon
6. Cesium
Answer:
neon is the Noble gas but I have not studied this much
Science
What part of all organisms Is involved in the exchanging of gases
Answer:
Gas exchange occurs in microscopic dead-end air-filled sacs called alveoli, where a very thin membrane (called the blood-air barrier) separates the blood in the alveolar capillaries (in the walls of the alveoli) from the alveolar air in the sacs.
Explanation:
which properties represent a metal ( select all that apply )
a. malleable
b. shiny
c. dull
d. brittle
e. good conductors
9. How does WNS negatively affect bats?
Answer:
Scientists hypothesized that WNS, caused by the fungus Pseudogymnoascus destructans, makes bats die by increasing the amount of energy they use during winter hibernation. Bats must carefully ration their energy supply during this time to survive without eating until spring
Explanation:
Practically: Add 1.66 ml of my 0.3M lemonade to a 15 ml microcentrifuge tube. Add 3.33 ml of your diluent (water, in this case) to bring your volume up to 5 ml. Mix your solution either by vortexing or by pipetting up and down with your pipetteman. Let's make sure you got this concept by answering a question below. I have made 15 ml of 200 mM CaCl2 stock and need to make 40 ml of 50mM for my experiment. How much of my concentrated stock solution (in milliliters) and how much water do I need to mix to make the 40 ml of 50mM CaCl2
Answer:
We would need 10 mL of the concentrated CaCl₂ stock solution, and 30 mL of water.
Explanation:
To solve the question asked we can use the C₁V₁=C₂V₂ equation, where:
C₁ = 200 mMV₁ = ?C₂ = 50 mMV₂ = 40 mLWe solve for V₁:
V₁ = 10 mLWe would need 10 mL of the concentrated CaCl₂ stock solution, and (40-10) 30 mL of water.
. If Kc is the equilibrium constant for a forward reaction, 2 A⇌ B, what is Kc' for the reaction 4 A⇌ 2B?
Answer:
(Kc)^2
Explanation:
For this reaction 4 A⇌ 2B Kc is (Kc)∧².
What is equilibrium constant?The equilibrium constant is the value of the reaction quotient that is calculated from the expression for chemical equilibrium. A thermodynamic equilibrium constant, denoted by , is defined to be the value of the reaction quotient Qt when forward and reverse reactions occur at the same rate. At chemical equilibrium, the chemical composition of the mixture does not change with time and the Gibbs free energy change. Stability constants, formation constants, binding constants, association constants and dissociation constants are all types of equilibrium constants.
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what is the answer?!!?
Plzzzz help
Answer:
The planet would stop
Good luck!
What is Molecule made off?
a) Electrons
b) Protons
c) Atoms
d) Nuclei
Answer:
C) Atoms
Explanation:
Hope that helped :)
Plz help mee
Sandy soil
A) holds water well
B) contains clay and humus
C) has loose grains and few nutrients
A
think of this way: in Florida and many other costal places, people have sand in their backyards to limit flooding and things due to being so close to the ocean.
Why is the combined gas law the most practiced gas law
Classify each of the following as elements (E), compounds (C) or Mixtures (M). Write the letter X if it is none of these. ______Diamond (C) ______Sugar (C6H12O6) _______Milk ____Iron (Fe) _____Air ______Sulfuric Acid (H2SO4) _______Gasoline (hydrocarbons) _____Electricity ______Krypton (K) ___Bismuth (Bi) ___Uranium (U) _______Kool-Aid ___Water (H2O) _____Alcohol (CH3OH) ______Pail of Garbage ___Ammonia (NH3) ___Salt (NaCl) ______Energy ______Gold (Au) _______Wood _______Bronze _______Ink ______Pizza ______Dry Ice (CO2) ______Baking Soda(sodium bicarbonate)
Answer:
Diamond - E
Sugar- C
Milk - M
Iron- E
Air- M
Sulfuric Acid- C
Gasoline - M
Electricity- X
Krypton- E
Bismuth - E
Uranium - E
Kool-Aid -M
Water - C
Alcohol - C
Pail of Garbage - M
Ammonia - C
Salt - C
Energy - X
Gold - E
Wood - M
Bronze - M
Ink - M
Pizza - M
Dry Ice - C
Baking Soda - C
Explanation:
An element is the smallest part of a substance that is capable of independent existence. An element cannot be broken down into any other substance. Krypton, Bismuth etc are all elements.
A compound is a combination of two or more elements which are chemically combined together e.g NH3, CO2 etc.
A mixture is any combination of substances that are not chemically combined together. E.g Pizza, milk etc
Why is classification important?
What is the chemical formula for a molecule of salt?
Answer:
Su fórmula molecular es Na Cl y es el producto de la base hidróxido sódico (NaOH) y ácido clorhídrico, H Cl. En general, las sales son compuestos iónicos que forman cristales. Son generalmente solubles en agua, donde se separan los dos iones. Las sales típicas tienen un punto de fusión alto, baja dureza, y baja compresibilidad.
Explanation:
help! help! plz Why do two H atams combine to Form the molecule H2 while He remains monotonic?
How atoms interact with other atoms is largely dependant on the number of electrons on its outermost layer. The electrons on this layer are called valence electrons.
As you might know, atoms have their electrons arranged in layers/shells, starting at k, l m, n etc. Each layer has a maximum number of electrons it can accommodate, with the outermost one being the valence shell. The first layer (k) can accomodate 2 electrons, the second one (l) can accomodate 8, as can the third one (m) etc.
As a rule of thumb, most atoms don't like being alone. These atoms have a valence shell that isn't saturated. This is the case for hydrogen(1), with one free slot in its outter shell.
However, atoms like helium are a bit different. They are inert, and don't need to bond with other atoms. This is because their valence shell is saturated. In this case, helium saturated the k shell with 2 electrons. Helium in this form will not form bonds.
However, hydrogen is still out there looking for buddies. Hydrogen will bind with any other atom with a free electron. Being extremely common, it's likely that said atom will be another hydrogen.
However, another common example would be for 2 hydrogens to bond with one oxygen, forming h2O (oxygen can form 2 bonds)
Conclusion : helium is inert and will not interact with other atoms. Hydrogen is not, and thus needs to bond with other atoms.
What is the numerical value of the rate constant for a reaction in which [A] is reduced from 0.380 M to 0.215 M in a span of 26.3 s? Assume the units of the rate constant are s-1. Please enter your response to three of significant figures using E notation. For example, to report 1347.54 to three significant figures, type: 1.35E3
Answer:
k = 2.17E-2 s-1
Explanation:
Initial Concentration [A]o = 0.380 M
Final Concentration [A] = 0.215 M
time, t = 26.3 s
Unit of rate constant = s-1
Rate constant = ?
The units of the rate constant depends on the order of the reaction. This is a first order reaction due to the units.
The integral rate law for a first order reaction is;
ln[A] = ln[A]o - kt
ln(0.215) = ln(0.380) - k(26.3)
ln(0.215) - ln(0.380) = - k(26.3)
- k(26.3) = -0.57
k = 0.57 / 26.3 = 0.02167
Reporting to three significant figures using E notation;
k = 2.17E-2 s-1