The presence of more copper-65 atoms in the rock suggests that it originated from outer space.
Explanation:In this case, the chemist can conclude that the rock is likely from a meteorite. The reason is that copper has two isotopes: copper-65 and copper-63. The natural abundance of these isotopes on Earth is such that copper-63 is much more abundant than copper-65. However, meteorites often have a different isotopic ratio, with more copper-65 relative to copper-63. So, the presence of more copper-65 atoms in the rock suggests that it originated from outer space.
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The higher presence of copper-65 atoms compared to copper-63 atoms in the rock could indicate that it is not of terrestrial origin, possibly being a piece of meteorite. Copper isotopes on Earth are more abundant in the form of copper-63, hence the unusual abundance of copper-65 could suggest an extraterrestrial source.
Explanation:The presence of more copper-65 atoms than copper-63 atoms in a given rock could suggest that it is of extraterrestrial origin. This is primarily deduced from the fact that copper (Cu) on Earth has two stable isotopes: Copper-63, with an abundance of 69.09%, and Copper-65, with an abundance of 30.91%. Hence, an arbitrary terrestrial piece of rock is likely to have more Copper-63 isotopes than Copper-65. This observation is contrary to your sample, suggesting it may not be terrestrial in origin.
Furthermore, certain meteorites are known to contain a variety of unusual elements and isotopic compositions that are not typically found on Earth, supporting the possibility that your rock could be a meteorite. Confirmation, however, requires thorough scientific analysis such as isotopic and elemental analysis.
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Gold has a molar mass of 197 g/mol. (a) how many moles of gold are in a 3.98 g sample of pure gold? (b) how many atoms are in the sample?
What did Dmitri Mendeleev contribute to science
He arranged the first periodic table?
Nic bought 12 pens for 2$ each and 12pads of paper for 3$ each. Write two expressions for how nic could calculate his total.Write one expression in expanded form and one in factored form.
How many orbitals are possible in the third energy level?
If cacl2 is dissolved in water, what can be said about the concentration of the ca2+ ion? hints if is dissolved in water, what can be said about the concentration of the ion? it has the same concentration as the cl− ion. its concentration is half that of the cl− ion. its concentration is twice that of the cl− ion. its concentration is one-third that of the cl− ion.
Do you know how to do this? if you have 4 grams of carbon-14, how much carbon 14 remains after 11,460 years? the half life is 5,730 years.
The wavelength of the characteristic, bright yellow-orange flame test color of sodium is 590 nm. Calculate the average energy (ΔE) associated with this atomic emission line.
Final answer:
The average energy associated with the atomic emission line of sodium with a wavelength of 590 nm is calculated using Planck's equation, resulting in an energy of approximately 3.37×10-19 Joules per photon.
Explanation:
The question asks for the calculation of the average energy (ΔE) associated with the atomic emission line of sodium, which has a wavelength of 590 nm. To calculate this, we use the Planck's equation ΔE = h⋅c / λ, where h is Planck's constant (6.626×10-34 J⋅s), c is the speed of light in a vacuum (3.00×108 m/s), and λ is the wavelength in meters.
To convert the wavelength from nanometers to meters, we use the conversion 590 nm = 590 × 10-9 m. Substituting the values into the equation gives us ΔE = (6.626×10-34 J⋅s) ⋅ (3.00×108 m/s) / (590×10-9 m), which calculates to an energy of about 3.37×10-19 Joules per photon.
Why is gunshot residue important for a forensic scientist? What are the potential complications with this type of evidence?
Answer 1: A gun shot residue is the powdery discharge that release after the firing process of the firearm. The powdery discharge consists of unburnt or partially burnt primer, propellants, fragments of the projectiles, cartilage cases and residues present inside the firearm.
It is important for the forensic scientists so as to detect the culprit as these residues are left on the clothes and hands after firing. It can be used to identify the direction and distance of firing.
Answer 2: The complications associated with gunshot residue are:
1. The particles are very small and may exhibit low density they are likely to blow by wind so they may not be found at some crime scene.
2. As the powdery discharge consists of explosive particles in small amounts but on testing can explode and can cause harm.
WILL MARK AS BRAINLIEST
Name the following ionic compounds.
Use the periodic table to answer this question: are the properties of rubidium (rb) more similar to cesium (cs) or those of strontium (sr)
A student has two substances at a lab table. One substance is iron pyrite (fool's gold) and the other is real gold. After placing a 20.0-gram sample of iron pyrite into 40.0 mL of water in a graduated cylinder, it displaces 4.0 mL of water. The density of real gold is almost 4 times larger than iron pyrite. If a 20.0-gram sample of real gold is placed into the same amount of water, approximately how much water will be displaced?
A) 1 mL
B) 4 mL
C) 16 mL
D) 20 mL
Answer:The correct answer is option A.
Explanation
Mass of the iron pyrite= 20 grams
Volume water displaced by the iron pyrite = 4 mL
Density of iron pyrite=[tex]d_i=\frac{Mass}{Volume}=\frac{20 g}{4 mL}=5 g/mL[/tex]
[tex]d_g=4\times d_i[/tex](Given)
[tex]d_g=4\times 5 g/mL=20 g/mL[/tex]
Mass of gold = 20 g
Volume of water displaced by the 20 grams of water = V
[tex]D_g=20 g/mL=\frac{20 g}{V}[/tex]
V = 1 mL
20 grams of gold will displace 1 ml of water.So, the correct answer is option A.
Sodium, a group 1 element with an electron configuration of 1s22s23s1, will form a _____ ion in a chemical bond ?
Compare and contrast an ionic bond with a polar covalent bond
An atom of aluminum has 13 protons and 14 neutrons. what is the atomic mass
The atomic mass of the atom of aluminum having 13 protons and 14 neutrons is 27
How to determine the atomic mass?Atomic mass of an atom is simply defined as the sum of the protons and neutron in the nucleus of an atom i.e
Atomic mass = proton + neutron
Now, we shall obtain the atomic mass of the atom of aluminum. Details below:
Number of protons = 13Number of neutrons = 14 Atomic mass =?Atomic mass = proton + neutron
= 13 + 14
= 27
Thus, we can conclude that the atomic mass of the atom of aluminum is 27
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In the water cycle, which state of matter has the particles closest together? solid liquid gas plasma
Answer:
solid
Explanation:
In the reaction B + KL + H, if an additional B is added, the result will be _____.
more K will be produced
more L will be required
the reaction will slow down
more L and H will be produced
Answer is: more L and H will be produced.
Balanced chemical reaction: B + K → L + H.
According to Le Chatelier's Principle, the position of equilibrium moves to counteract the change.
The position of equilibrium will move so that the concentration of B decreases again, by reacting more and produce L and H, reaction is going to be more in forward direction.
Calcium chloride contains calcium and chloride ions. write the ground-state electron configuration for the chlorine ion.
The electron configuration of an atom of Chlorine Cl (neutral Chlorine) is:
1s2 2s2 2p6 3s2 3p5
Now if the Chlorine becomes an ion, it becomes Cl-. So we can see that 1 electron is added therefore the new electron configuration is:
1s2 2s2 2p6 3s2 3p6
Which sample of copper has atoms with the lowest average kinetic energy?
What is a double bond?
Question 4 options:
two covalent bonds between adjacent molecules
a total of two covalent bonds in a molecule
two covalent bonds between adjacent atoms in a molecule
a total of two covalent bonds between molecules
The answer is A
Two covalent bonds between adjacent molecules
Hope it helps you
Pellets of calcium chloride are spread on a sidewalk covered in water that is 36°C. Under which circumstance will the calcium chloride dissolve faster?
Answer:
In case if the pellets of the calcium chloride gets crushed.
Explanation:
When the pellets of calcium chloride get crushed it enhances the surface area of the compound. With the increase in surface area, the number of collisions in between the molecules of reactants increases. In the given case, the reactant molecules are water molecules and calcium chloride ions. In the procedure of dissolution, the calcium chloride ions get hydrated by the water molecules dipoles. As the frequency of the collision enhances, the activation energy gets lowered in order to begin the reaction.
Which best explains why collective bargaining increases the bargaining power of workers?
The answer to this question is It's difficult for employers to replace their entire work force.
List the sub-atomic particles in the order in which they were discovered and tell who discovered each one.
Define and then describe the difference between a polar covalent bond, nonpolar covalent bond and ionic bond.
Why is a neutral iron atom a different element than a neutral carbon atom?
How many grams of h2 are needed to react with 48 grams of o2, given the reaction: 2 h2 (g) + o2 (g) --> 2 h2o (l)?
The stoichiometric equation shows that 2 moles of H2 react with 1 mole of O2. In this scenario, 48 grams of O2 is equivalent to 1.5 moles. Therefore, 1.5 moles of O2 would react with 3 moles of H2, which is equivalent to 6 grams.
Explanation:To solve this question, we must first understand the stoichiometric relationship that exists between H2 and O2 according to the given equation: 2 H2 (g) + O2 (g) --> 2 H2O (l). What this equation shows is that 2 moles of H2 react with 1 mole of O2.
Next, we must convert grams of O2 to moles, using its molar mass. The molar mass of O2 is 32 g/mol, so 48 grams of O2 is equivalent to 48 g / 32 g/mol = 1.5 mol.
Then we use the stoichiometric relationship to calculate the moles of H2 needed. As per the reaction, 1 mole of O2 reacts with 2 moles of H2, hence 1.5 moles of O2 would react with 2*1.5 = 3 moles of H2. Finally, convert the moles of H2 to grams, using its molar mass (2 g/mol). So, 3 mol * 2 g/mol = 6 g. Therefore, 6 grams of H2 are needed to react with 48 grams of O2.
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Light travels in _______.
A.
circles
B.
waves
C.
electricity
D.
opaque objects
why does your reflection in a mirror look different from your reflection in wood
The surface of a mirror is smoothly and therefore the rays of light are reflected with the same angle they hit the surface. The surface of a piece of wood on the other hand has a lot of microscopical imperfections and hence the rays of light are reflected in multiple directions.
The reflection in a mirror looks different from the reflection in wood because mirrors have smooth surfaces that reflect light at specific angles, while wood and other rough surfaces diffuse and reflect light in many different directions.
Explanation:When we look at our reflection in a mirror, we see a clear and accurate representation of ourselves because mirrors have smooth surfaces that reflect light at specific angles. On the other hand, when we look at our reflection in wood or other rough surfaces, the light gets diffused and reflected in many different directions, causing distortions and a less accurate reflection.
Why the atomic mass of the copper is not exactly equal to 64
How do the names of covalent compounds differ from the names of ionic compounds?
The names of ionic compounds have special endings for the second element or ion while the name of covalent compounds depends on the subscript of each of the elements in the compound.
Ionic compounds are usually made up of a cation and an anion. There is no special ending in the name of the cation but certain suffixes are used for the second element or ion in an ionic compound.
For instance, the second element in most ionic compounds have the ending "-ide". Typical examples are sodium oxide, magnesium nitride and calcium phosphide.
In naming covalent molecules, we need to be sure that the subscripts of the molecules are duly indicated. For instance, N2O5 is dinitrogen pentaoxide.
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When preparing dilute solutions of an acid, carefully pour -
a. both liquids at once
b. the acid into the container
c. the acid into the water
d. water into the acid?
When preparing dilute solutions of acid, carefully pour the acid into the water.
Explanation:
Acid is a chemical substance that gives hydronium ions in their aqueous solution.[tex]HA(s)+H_2O(l)\rightarrow H_3O^+(aq)+A^-(aq)[/tex]
Their aqueous solution tastes sour.They are used to neutralize the alkali solution. Like hydrochloric acid neutralizes sodium hydroxide to give sodium chloride and water as a product.The acid solution with a larger amount of acid in its solution is considered a concentrated acid solution.The acid solution with a smaller amount of acid in its solution is considered a dilute acid solution.The concentrated acid solution can be changed into a dilute acid solution by adding the concentrated acid solution in water slowly and with constant stirring.Do not add water in concentrated acid solution as water and acid reacts vigorously which can cause water to boil and acid to splash.So, from this, we conclude that when preparing dilute solutions of acid, carefully pour the acid into the water.
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