Answer:
protons and neutrons
Explanation:
a rock is examined to determine its age, and the ratio of uranium-235 to lead-207 is found to be 125,000:875,000. the half-life of uranium-235 is 700 million years. how old is the rock being examined?
The old age of rock when examined is 21.4 million years if the ratio of uranium-235 to lead-207 is found to be 125,000:875,000. the half-life of uranium-235 is 700 million years.
Decaying EquationP = [P + D] (1/2) ^(t/t(1/2))
where,
P represent the present parent amount
D is the present daughter amount
t(1/2) is the half life time period
t is the actual age
We know that,
t = (log[(P+D) /P] / log2) × t(1/2) ----------(1)
Given,
P = 97.6
D = 2.1
Ratio of P and D can be calculated as
P/D = 97.6/2.1
= 46.476
By substituting all the values in eq(1), we get
t = [(log 46.476 +1)/log2] × t(1/2)
Given,
The half life of U —Pb decay is 700 million years.
So,
t = [(log 46.476 +1)/log2] × 700
t = 21.4 million years.
Thus, we calculated that the the old age of rock when examined is 21.4 million years.
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DISCLAIMER:
The given question is misprint on portal.
Here is the correct form of question:
A rock is examined to determine its age, and the ratio of uranium-235 to lead-207 is found to be 125,000:875,000. the half-life of uranium-235 is 700 million years.
How old is the rock if it contains Uranium-235/ lead-207 ratio of 97.6 to 2.1?
31. (03.03 MC)
Which of the following best represents and explains the formula for a compound made from fluorine and hydrogen? (5 points)
O HF, because both fluorine and hydrogen are capable of forming only one lonic bond.
O HF, because both fluorine and hydrogen are capable of forming only one covalent bond.
O H,F, because fluorine is short of two electrons, and hydrogen is short of one electron.
OH,F, because fluorine is capable of forming one, and hydrogen is capable of forming two covalent bonds.
Answer:c
Explanation:
Which force helps food move through the large intestine during digestion?
A Muscle contractions exert a pushing force on the food.
B Oxygen molecules exert a pulling force on the food.
C Gravity exerts an upward pushing force on the food.
D Water exerts an upward pushing force on the food.
Answer:
The answer is A
Explanation:
Pls put me as brainliest
The force helps food move through the large intestine during digestion is muscle contractions exert a pushing force on the food. Thus option A is correct.
What is force?Force is defined as a push or pull upon any object resulting from the object's interaction with another object. It is a vector quantity.
Force can also be defined as an external cause that, when applied, changes or tends to change the state of the body, if the body is in motion.
Force is expressed as
Force = mass x acceleration
There are five types of force
Gravitational forceElectric forceMagnetic forceNuclear forceFrictional forceDigestion is define as the breakdown of food into smaller component that can be absorbed into blood streams.
Thus, the force helps food move through the large intestine during digestion is muscle contractions exert a pushing force on the food. Thus option A is correct.
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using your balanced equation from q20, determine how many ml of 0.25 m koh is needed to neutralize 10 ml of 0.5 m h3po4
60 mL volume of 0.25M KOH was needed to neutralize 10 mL of 0.50 M H3PO4.
The balanced reaction for the reaction of KOH and H3PO4 is shown below.
3KOH + H3PO4 → K3PO4 + 3H2O
mol of H3PO4 = (0.50 M) * (10 mL) * (1 L/1000 mL) = 5x10-3 mol
The number of moles of KOH needed to neutralize H3PO4 will depend on their stoichiometric ratio.
moles KOH = mol H3PO4 * (3 mol KOH / 1 mol H3PO4)
moles KOH = 5x10-3 mol * (3 mol KOH / 1 mol H3PO4)
moles KOH = 1.5X10-2 mol
mol of KOH = (concentration KOH)(volume KOH)
volume KOH = mol KOH / concentration KOH
volume KOH = 1.5 x 10 -2 mol / 0.25 M
volume KOH = 0.06 L or 60 mL
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ASAP please and thankyou
Options:
pollen
pistil
purple
white
Answer:
pistil
Explanation:
As a reaction proceeds, does the instantaneous reaction rate increase or decrease?.
The correct answer for this question is Decreases.
How quickly or slowly a reaction proceeds is known as the rate of reaction or speed of reaction for a reactant or product. As the reaction progresses, the rate of reaction slows because the initial concentration of the reactants is high, but as time goes on, this concentration falls, making the reaction slower. As a result, the rate of reaction is dependent on concentration and diminishes over time.
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What is the density of a board whose dimensions are 5.54 cm x 10.6 cm X 199 cm and
whose mass is 28.6 g?
Answer:
0.00244g/cm³ (3 s.f.)
Explanation:
The formula of density is [tex]\frac{mass}{volume}[/tex]. We already know the mass is 28.6kg, so we need to find the volume first before calculating the density.
Volume of board = 5.54 cm × 10.6 cm × 199 cm
= 11 700 cm³ (3 s.f.)
Density of board = [tex]\frac{28.6}{11 700}[/tex]
= 0.00244g/cm³ (3 s.f.)
Answer:
d = 0.0024 g/cm³
Explanation:
Given data:
Density of board = ?
Volume = 5.54 cm× 10.6 cm× 199 cm
Mass of board = 28.6 g
Solution:
Formula:
d = m/v
d = density
m = mass
v = volume
Volume = 5.54 cm× 10.6 cm× 199 cm = 11686.1 cm³
d = 28.6 g/ 11686.1 cm³
d = 0.0024 g/cm³
Which statement best explains why protons are used
to identify an element?
Answer:
Every atom of an element will have the same number of protons
Explanation:
Protons are used to identify an element because every atom of an element will have the same number of protons.
Protons are the positively charged particles found in an atom. They are called the atomic numberEvery atom of an element has the same number of protons. An element can have different atom in form of isotopes. These isotopes are only identifiable by the number of protons they have.is energy transfered from reactants to products or products and reactants.
Answer: Energy is transferred from reactants to products .
Explanation: Energy is used to break bonds in reactants, and energy is released when new bonds form in products. Reactants are your starting point, and products are your result.
F the distance separating the objects is the same for each pair, which pair of objects will have the greatest gravitational force between them? a 50-kg object and an 80-kg object a 65-kg object and a 65-kg object a 65-kg object and a 75-kg object a 60-kg object and a 70-kg object
Answer:
A 65-kg object and an 75-kg object.
Explanation:
The gravitational force is given by :
[tex]F=G\dfrac{m_1m_2}{r^2}[/tex]
F is directly proportional to the product of masses and inversely to the distance between them.
In this problem, the distance separating the objects is same for each pair. We need to find the greatest gravitational force between them.
(1) a 50-kg object and an 80-kg object
[tex]F_1=G\dfrac{4000}{r^2}\ N[/tex]
(2) a 65-kg object and an 65-kg object
[tex]F_2=G\dfrac{4225}{r^2}\ N[/tex]
(3) a 65-kg object and an 75-kg object
[tex]F_3=G\dfrac{4875}{r^2}\ N[/tex]
(4) a 60-kg object and an 70-kg object
[tex]F_4=G\dfrac{4200}{r^2}\ N[/tex]
From the above calculations we find that if the product of masses is maximum, it lead to maximum gravitational force between objects. Hence, a 65-kg object and an 75-kg object will have maximum gravitational force between them.
mass in grams of 3.32 mol k
Answer:
129.8 grams
Explanation:
Im a bit confused of what your are asking but if your are asking the mass in grams of K (Potassium) it is very easy dont worry
You multiply mols x Molecular weight.
So
3.32x 39.1= 129.8 grams
What is the movement of particles of an object on the amount of what have
Answer:
i just ad the same question and but i fon know what ther answrr ied so i cant hep you but i had he smae question on rge mdhfyqf
Explanation:
which contains the least number of electrons
Answer: I don't know try your best
Explanation:
Which substance is a pure substance? Cereal Silver Jelly bean Shampoo
Answer: Silver
Explanation:
Answer:
SILVERRRRRRRRRRR
Explanation:
What is a negative Gibbs free-energy value an indication of?
an enzymatic reaction
a reversible reaction
a spontaneous reaction
an equilibrium reaction
A negative Gibbs free-energy value is an indication of a spontaneous reaction. This means that the reaction will occur without the need for any external energy input and will release energy that can be used to drive other processes. The correct answer is option c.
Gibbs free energy is a thermodynamic quantity that describes the amount of energy available to do work in a system. It takes into account both the enthalpy (heat) and entropy (disorder) of a system.
A negative Gibbs free-energy value indicates that the reaction will release energy and increase the disorder of the system, which is a characteristic of spontaneous reactions.Therefore, a negative Gibbs free-energy value is an indication of a spontaneous reaction. Option c is the correct answer.
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1.3 How Science Works - Notes
What is science?
Answer: I think you have to look in the textbook
Explanation:
it's impossible to answer without the stinking textbook
What type of representative particle does KClO3 have?
atoms
formula units
molecules
Answer:
formula units
Explanation:
[tex]$KClO_3$[/tex] is potassium chlorate. It is an ionic compound containing potassium, chlorine and oxygen. The ion in potassium chlorate are held together by the ionic bonds in the lattice structure.
A representative particle may be defined as the smallest unit for which the substance exists in its natural form. For most of the elements, atom is the representative particle. Molecule is the representative particle for diatoms and molecular compounds. But for ionic compounds such as [tex]$KClO_3$[/tex] , NaCl, etc. . the representative particle is its formula units.
Why aren't 3rd 4th and 5th compounds having same stability?
Answer:
Due to cis trans isomerism
Explanation:
what is the name of the covalent compound N5Cl8
Answer:
Did you put that in right because i've never heard of a compound called that nor is there a compound called that on the internet
Explanation:
You must of put that in wrong
Define covalent bond.
Which has the longest bond length for the Cl-O bond?
1. ClO4-
2. ClO3-
3. ClO2-
4. ClO-
Answer:
4 ClO-
Explanation:
Bond length ∝ 1/ Bond order
Bond order of ClO − =1,
Bond order of ClO 2− =1.5,
Bond order of ClO 3− =1.66 ,
Bond order of ClO 4− =1.75.
Thus the order of bond length is
ClO 4− <ClO3− <ClO2−
<ClO −
What is pentene?
A.) An Alkane
B.) An Alkene
C.) An Alkyne
D.) A Polymer
Answer:
B. an alkene
Explanation:
pentene has 5 carbons and 10 hydrogen atoms and one double bond
convert 7.1x10^25 molecules of water to moles
Answer:
117.94 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{7.1 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 117.940199...[/tex]
We have the final answer as
117.94 molesHope this helps you
Can someone help me please? It’s due before 2 today...
Answer:
A inside the nucleus
Explanation:
All the protons (and neutrons) in an atom belong in the nucleus of an atom. Only the electrons of an atom stay in orbit.
You are a chemist working in your laboratory. In your storage closet you have a cabinet that holds only samples of pure elements, no compounds. While looking for a sample of lithium (Li), you notice that the label on one bottle has worn off. The room is at normal temperature. The contents of the bottle are liquid and do not look metallic. What element should you relabel the bottle as?
Answer:
Mercury
Explanation:
While it is true that most metals are solid at room temperature, mercury is liquid at room temperature hence mercury is often designated as the 'liquid metal'.
Thus, if i find a bottle on the shelf that has no solid in it, only liquid and i know that only pure metals are stored in that area of the laboratory, then i will quickly relabel it as mercury.
[I'd really appreciate if I could get some help with this. ]
Complete the table below by indicating what kind of interaction (attract or repel) will be evident when particles of different or like-charges interact?
Like charges repel while the unlike charges attract.
What is electrostatics?Electrostatics has to do with the interaction that does occur between charges. We know that a charge is a specie that has an imbalance in the number of electrons that it contains. The substance is positively charged if it contains less electrons and more protons. The substance is negatively charged if it contains more electrons and less of protons.
In either case, the interaction that exist between particles could be an attractive one or a repulsive one. It is regarded as the first law of electrostatics that like charges repel while the unlike charges attract.
Hence when we look at the table, a negative charge would repel another negative charge, a positive charge would repel another positive charge but a positive or a negative charge would attract a charge of opposite sign. The interaction that is possible between the charges is given by Coulombs law.
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A sample of silver metal contains 1.91 X 1021 atoms. How many moles of silver is
this?
Answer:
1.91×1021/6.023×10^23
Explanation:
need thanks and make me brainiest if it helps you
Write the properties of solid substances.
what atom does not contain neutron
Answer:
There is only one stable atom that does not have neutrons. It is an isotope of the element hydrogen called protium. Protium, which contains a single proton and a single electron, is the simplest atom. All other stable atoms contain some number of neutrons. hope this helps you :)
Some lipid rafts are characterized by an accumulation of cholesterol. What does this mean for the fluidity of the lipid raft?.
The lipid rafts are less fluid than the surrounding membrane at normal temperatures.
Cholesterol decreases the fluidity of the membrane at normal temperatures.
Lipid rafts regulate neurotransmission, receptor traffickinging and influence membrane fluidity.
For example, in phospholipid layer in cell membrane, there are hydrophilic heads (polar part of the layer) and hydrophobic tails (nonpolar part of the layer).
1) Small, non-polar molecules diffuse easily through this layer, no energy is required, this is passive transport.
2) Polar molecules cannot diffuse through phospholipid layer using passive transport, because hydrophobic tails does not allow that (polar molecules are reppeled), energy is required for that, this is active transport.
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