Answer: We know that, 1 mole of any substance contain 6.022 X 10^23 atoms/molecules. Thus, 2.14 moles are present in 1.29x10^24 hydrogen atoms in HF.
Explanation:
divide it by avogadro's constant
that is 6.02 × 10²³
1.2 × 10²⁴ / 6.02 × 10²³
= 2 mol
How is a scientific law different from other laws in society?
A. A scientific law serves to protect people, property, and nature from
harm.
OB. A scientific law describes what always happens under specific
conditions in nature.
C. A scientific law is a rule about how to treat and punish people.
D. A scientific law is what scientists have decided should be forced
to happen in nature.
Answer:
B. A scientific law describes what always happens under specific
conditions in nature.
Explanation:
Scientific law is something that has been proven over and over and therefore is always correct under conditions in nature.
Answer:
B. A scientific law describes what always happens under specific
conditions in nature.
Explanation:
Scientific law is based on observation and experiments to support a claim. It usually describes nature.
Metallic bonding occurs between atoms of
1.)sulfur
2.)copper
3.)fluorine
4.)carbon
Answer:
copper
Explanation:
metallic bonds occur among the metal atoms where iconic bonds join metal and nonmetals metallic bonding joins a bolt of metal atoms a sheet of aluminum foil and a copper wire are both place where you can see metallic bonding in action the Sea of electrons that is free to flow about the crystal of positive metal ions
Metallic bonding occurs between metal atoms. Among the given copper is example of metal in which copper atoms are strongly held by metallic bonds.
What are metals?Metals are electropositive elements. Metals contains a pool of mobile electrons among the sea of positive ions. Metals exhibit some peculiar features such as conductivity, hardness, malleability, ductility, luster etc.
Metals atoms form well orders crystalline structure in which particles are held together by strong metallic bonds. In periodic table, the first two groups and all the d-block elements are metals.
Copper is a transition metal in d-block. Copper is a very important metal in our lives and in industries since it is used in constructions, electronics, house hold items etc., because of its hardness and conductivity. Hence, option 2 is correct.
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True or False. Index Fossils are formed from organisms that were alive for short period of geologic time, are extinct, had hard parts, and lived across wide geographic area.
Answer:
Index fossil, any animal or plant preserved in the rock record of the Earth that is characteristic of a particular span of geologic time or environment.
Explanation:
True
Answer:
Explanation:
What does what does c6h12o6+6o2→6co2+6h2o+energy equal to?
Answer: c6h12o6+6o2→6co2+6h2o= C6H12O6 + 6O2 -> 6CO2 + 6H2O Yields 2755 kJ/mole of glucose. The reverse of this reaction – combing carbon dioxide and water to make sugar is known as photosynthesis. Photosynthesis is the process responsible for storing all the energy we extract from fossil fuels, crops, and all of our food. We will also see that it is part of a globally important cycle affected by our consumption of fossil fuels. Photosynthesis How is photosynthesis able to run the reaction above in the reverse direction? Somehow it must come up with 2755 kJ of energy to make each mole of glucose. Where does that energy come from? The short answer: photons of sunlight. The long answer: When the pigment chlorophyll inside the chloroplasts of a photosynthetic organism (phytoplankton, trees, other plants) absorbs sunlight, it becomes energetically ‘excited’ and grabs the hydrogen atoms away from a water molecule, leaving the oxygen atoms to escape as O2 gas. This is called ‘splitting water.’ The hydrogen atoms are then split into their component protons and electrons. The electrons are used to reduce carbon dioxide, in a series of many steps requiring more absorption of sunlight by chlorophyll, to glucose. When carbon dioxide receives those electrons, the extra negative charge attracts protons from elsewhere, creating hydrogen atoms attached to the carbon atom. This process is called reduction. When those reduced carbon dioxide molecules are combined together in a larger molecule, the result is glucose. This ‘combing together’ of small molecules requires an input of energy, which is provided by the ATP molecules made by the protons diffusing through the membrane of the chloroplast. The ATP molecule is simply a molecule that biology uses to store energy for later use. In this case, the mechanical energy created by the protons diffusing across the membrane turns a sort of molecular turbine that smashes together its precursors.
Which of the following is an example of chemical energy?
Select one:
a hot metal pan
a light bulb
a burger & fries
an empty bowl
a light bulb is the example of chemical energy
Answer:
a light bulb
Explanation:
how is it proved that carbon is present in sugar?
Answer:
In all living organisms, in substances like carbohydrate, starch, urea etc. To prove sugar contains carbon, take a little amount of sugar in spoon and heat it gently till it melts and turned into yellowish color. On further heating it changes into brown colored mass and then black, which is charcoal.
Take a small bit of sugar on a spoon and slowly heat it until it melts and turns a yellowish tint to demonstrate that it contains carbon. As it continues to heat up, it transforms into charcoal, which is a black mass first.
What is Charcoal ?Strongly heating wood with little oxygen produces charcoal, a light black carbon residue that has been stripped of all water and volatile components.
Since the beginning of time, charcoal has been used for a wide variety of reasons, including art and healing, but its most significant usage has been as a metallurgical fuel. The typical fuel for a blacksmith's forge and other uses requiring high heat is charcoal.
Sugar breaks down into carbon and water when it is heated. Water is still a chemical, but it can't be heated
Thus, As it continues to heat up, it transforms into charcoal, which is a black mass first.
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Which of the following statements is correct?
Group of answer choices
A. Low pressure indicates rising air, which allows clouds to form.
B. High pressure indicates rising air, which allows clouds to form.
C. Low pressure indicates sinking air, which allows clouds to form.
D. High pressure indicates sinking air, which allows clouds to form.
I think its A. Low pressure indicates rising air, Which allows clouds to from.
I need help please i need to turn this in today
Answer:
Natural phenomena such as melting glaciers is due to the rise in temperature. This will result to extinction of flora and fauna. Moreover it can cause extreme flooding due to rise in water level in other water bodies such as rivers, lakes
What would happen to Earth's temperature if the energy absorbed from the sun (solar radiation) was less than the emitted (thermal) energy leaving the Earth?
Answer:
The Earth would become cooler until it probably attains a new equilibrium between absorbed solar energy and emitted solar energy.
Explanation:
The earth's energy balance refers to the balance between the energy absorbed from the sun (solar radiation) and the emitted (thermal) energy leaving the Earth. This balance ensures that the earth's surface temperature remains fairly constant.
When energy from the sun reaches the earth, it is absorbed and used by various features of the earth which uses it for their energy needs. Eventually, any excess radiant energy is sent back or emitted from the earth back into space such that the balance between absorbed and emitted energy is maintained.
However, if there is an imbalance whereby more energy is emitted than is absorbed, this would result in the earth losing more heat than it receives. This would result in the earth becoming more significantly colder until it probably attains a new equilibrium between absorbed solar energy and emitted solar energy.
Some weather conditions are shown.
Weather Conditions
• Cold front moving in behind warm, moist air
• Heavy, constant winds
• Sudden hail
• Unstable atmosphere
Which type of severe event is MOST likely to occur during these weather conditions?
Answer:
Tornado
Explanation:
This is because, tornados are heavy constant winds that are blowing around all over causing an unstable atmosphere. Sometimes the weather will change drastically like causing hail, and cold fronts moving in. This is exactly what matches the conditions you show! :)
Hope this helps! Please mark as brainliest!
NEED HELP ASAP 50 POINTS WILL MARK BRAINLIEST!
Answer:
156748
Explanation:
The first number is on the magnetism card 1
The combination contains only the numbers found on the cards showing techniques to separate mixtures 1,5,6,7,8
The last number is on the filtering card
The red is in the middle half of 8 is 4
1. Explain where they bury remains at the Forensic Osteological Research Center and why
Answer:
In the middle of the forest.
Explanation:
They have to bury the remains in the middle of the forest at the Forensic Osteological Research Center in order to study the decomposition of the dead person. By studying the decomposition of dead person we can get a lot of information which can be used in the study of criminal cases and solving of crimes. The middle place in the forest is a perfect place to bury the remains due to presence of huge amount of microbes as well as insect that helps in the decomposition.
3. Students measured the mass of the reactants and products for a combustion reaction they observed.
When they measured the mass of the products, they discovered the products had a greater mass than
the reactants. How did this unexpected change in mass occur?
A. Stadents made a measurement error, because ending with more products is impossible.
B. The reactants had hidden materials within them that had no mass until the reaction was complete.
C. The products of reactions often have greater mass, because the law of conservation is not
applicable in all chemical reactions.
D. The reaction occurred in an open system, so during the reaction a gas interacted with the reactants.
The mass of the gas could not be measured before the reaction.
Answer:
A. Students made a measurement error, because ending with more products is impossible.
Explanation:
The law of conversation of matter tells us that in a chemical reaction, matter is never created or destroyed, it's simply converted from one form to another. So the mass of reactants should always equal the mass of the products in a chemical reaction. If there is excess mass in the product, the students have made an error of some kind.
:)
Why is water called.compound
Answer:
because it's composed of two elements, hydrogen and oxygen. water is technically a molecular compound tho, for it has two hydrogens.
what is a molecule??
Answer:
molecule is a group of atoms bonded together representing the smallest fundamental unit of a chemical reaction
If both samples contain the same amount of gas, which sample has a greater volume? use your knowledge of gas laws to explain your answer
Answer:A modern statement is: Avogadro's law states that "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules." For a given mass of an ideal gas, the volume and amount (moles) of the gas are directly proportional if the temperature and pressure are constant.
Explanation:
The Avogadro's law is used here to determine the volume of the gas. Here the both samples have equal volume since they contain the same amount of gas.
What is Avogadro's law?The Avogadro's law states that equal volumes of all gases under similar conditions of temperature and pressure contain equal number of molecules. Mathematically the law can be expressed as:
V ∝ n
The gases show great uniformity in their behaviour irrespective of their nature. Some useful generalisations have been deduced from the behaviour of gases which are known as gas laws.
The Avogadro's law follows that the volume of a gas is directly proportional to the number of molecules. But the number of molecules (N) of any gas is directly proportional to its number of moles (n).
So here if both samples contain the same amount of gas, both of them have the equal volumes. We cannot determine one with greater volume.
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PLEASE HELP I WILL MARK YOU BRAINLIEST !!If you react 4.25 moles of FeCl2, how many moles of Cl2 did you also react?
ILL GIVE 12 POINTS TOO PLEASE IM BEGGING FOR HELPPPPP
Convert 75k to oC
(I’ll mark you as brainlister)
Answer:
-198.15
Explanation:
sorry if wrong form
Using the diagram, which two planes would intersect in HG?
Answer please .. :)
Answer:
I think D
Explanation:
it has both H and G in the planes.
What is a force is needed to stop a child form slipping on ice
Answer:
Friction. Hope I helped.
Who want a brainliest? You do? Oh ok. Technically I have to write a question, so answer these...
1 + 1 =
2 + 2 =
4 + 4 =
7 + 7 =
8 + 8 =
(Hint: none of the answers are numbers ;)
Answer:
so wat is it in?.....????
1. too
2. for
3. ate
4.for teen
5. suck`s teen
did i get it right?
Please help!
Check the element pairings that are likely to react with each other. Refer to the periodic table for assistance
1. Li and Be
2. Rb and Br
3. Fr and Cl
4. Rb and Ca
5. Li and Cl
6. F and Ne
Answer:
Lithium and Beryllium
Rubidium and Bromine
Francium and Chromium
Rubidium and Calcium
Lithium and Chlorine
Fluorine and Neo
Answer:
Rb and Br
Fr and Cl
Li and Cl
Explanation:
HELPP ILL GUVE YOU LOTS OF POINTS EVERYTHING U WANT I REALLY NEED HELP
Answer:
jupiter is your answer
Explanation:
you weigh more there
Determine the mass of the following.
a) 5.65 x 1024 molecules of CaBr2
b) 4.25 x 1023 molecules of N2
c) 9.10 x 1022 molecules of Ba(NO3)2
d) 3.01 x 1022 molecules of Ga2(CO3)3
Answer:
a ) 1876.14 grams CaBr2
b ) 19.78 grams N2
sorry..i only have time to do the first two :)
Explanation:
Help please!! In this question x represents which element?
31
15 x
A. 31 gallium Ga
B. 15 phosphorus P
C. 46 palladium Pd
Answer: think It is A. 31 gallium Ga or C. 46 palladium Pd
It’s Integrated Chemistry
How many molecules are in 5.50 moles of sulfer dioxide
Answer:
(5.50) ( 6.02 *10^23)
Explanation:
The number of molecules equals the number of moles times Avagadro's number.
Which of the following is a potential disadvantage of using wind energy? (2 answers)
A)It has potential to kill fish caught in the turbines
B)The source of energy can sometimes be inconsistent
C)It alters migratory bird routes
D)It is influenced by the amount of cloud cover
E)It releases high amounts of carbon dioxide when used
Answer:
It's probably b
Explanation:
(I'm wrong aren't I)
Which of the following pairs of elements will combine to produce a covalent bond?
1-Hydrogen and chlorine
2-Magnesium and oxygen
3-Lithium and bromine
Answer:
Hydrogen and Chlorine
ie HCL
The pairs of chemical elements that will combine to produce a covalent bond is: 1. Hydrogen and chlorine.
In Chemistry, the three (3) main types of chemical bonds include:
Ionic bonds: Lithium and bromineHydrogen bonds: Hydrogen and oxygen.Covalent bonds: Hydrogen and chlorine.A covalent bond can be defined as a type of bond that typically involves the sharing of electrons between the atoms of a chemical element.
For example, the type of bond that is produced (formed) between hydrogen atoms and a chlorine atom is a covalent bond.
The hydrogen atom shares it single electron with a chlorine atom that is having seven (7) valence electrons to produce an inert gas such as hydrochloric acid (HCL).
In conclusion, the pairs of chemical elements that will combine to produce a covalent bond is hydrogen and chlorine.
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25. The ability of one substance to dissolve in another at a given temperature and
pressure is known as:
a. Solubility
b. Freezing point
c. Melting point
d. Concentration
Answer:
Melting point
Explanation:
And here is your answer hope it would be correct