Answer:
False
Explanation:
By studying the distribution of different types of fossils, geologists have determined that some plates have traveled great distances. Evidence to support this comes from the fact that –
A.fossils of organisms that lived in warm climates have been found in arctic environments.
B. Species of organisms in the fossil record have changed over geologic time.
C. Some fossilized organisms have only been found on one continent.
D. The oldest known fossils, found in the deepest rock layers, represent ocean organisms.
Answer:
A. Fossils of organisms that lived in warm climates have been found in arctic environments.
Explanation:
One of the logic used by Geologists to justify plate movement over a region of space is that the fossils of organisms that lived in warm climates have been found in arctic environments.
this is as a result of plate tectonics. organisms that are well adapted to warm climates in times past have their relics preserved as fossils. their fossils are no found today around the arctic environment which are coldthis suggests that the plate must have drifted or movedA subrule of the Cahn-Ingold-Prelog system specifies that higher mass number takes precedence over lower when distinguishing between isotopes. Determine the absolute configurations of the reactant and product in the biological oxidation of isotopically labeled ethane.
Answer:
The correct answer is - S- configuration.
Explanation:
Placing the numbers in order of the priorities of each reactant in the reaction is essential to determining the configuration of the reactant and product in the biological oxidation of isotopically labeled ethane.
CH3 - T- D is the correct order of the increasing of the priorties. so this is moving from CH3 to D which is Anti-clockwise which means the configuartion is S as we know clockwise movement is R configuarion and anti-clockwise in S configuartion.
Arrange the following 0.10 M aqueous solutions in order of increasing pH:
a. NaOH
b. HBr
c. NaCH3CO2
d. KBr
e. NH4Br.
Answer:
The correct answer is HBr<NH4Br<KBr<NaCH3CO2<NaOH.
Explanation:
When salt is added to the water, the formation of acid and base takes place. The pH helps in predicting the basicity, acidity, and neutrality of a compound.
It is known that NaOH is a strong base, thus, its solution will be basic, and therefore, the pH of NaOH will be greater than 7.
The solution of HBr will be acidic as HBr is the strong acid, thus, its pH will be less than 7.
In dissolving NaCH3CO2 in water, the formation of CH3COOH, which is a weak acid, and NaOH that is, a strong base takes place. Therefore, as NaOH is the strong base, the solution will be basic, and the pH of NaCH3CO2 will be greater than 7.
On dissolving KBr in water, HBr, that is, a strong acid, and KOH, that is, a strong base is produced. Therefore, as HBr is the strong acid, and KOH is the strong base, the solution will be neutral. Thus, the pH of KBr will be equivalent to 7.
On dissolving NH4Br in water, the formation of HBr, that is, strong acid, and NH4OH, that is, the weak base takes place. Therefore, as HBr is the strong acid, the solution will be acidic, and the pH of NH4Br will be less than 7.
Hence, the increasing order of pH of 0.10 M aqueous solution will be,
HBr<NH4Br<KBr<NaCH3CO2<NaOH
The order of increasing pH of the solutions is; HBr < NH4Br < KBr < NaCH3CO2 < NaOH.
pH is a number that indicates the degree of acidity or alkalinity of a substance. The pH scale ranks from 0 - 14. 0 - 6.9 indicates acidity, 7 indicates neutrality while 8 - 14 indicates alkalinity.
The order of increasing pH of the solutions is; HBr < NH4Br < KBr < NaCH3CO2 < NaOH. Recall that NH4Br yields an acidic solution while NaCH3CO2 yields a basic solution.
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The moment that X-locks are released will determine A. The compliance with ACID B. The anomalies present C. X-locks are always released during commit time D. The granularity of locks
Answer:
D. The granularity of locks.
Explanation:
X-locks is one of the locks used in locking database in what is known as adaptive server. Other types of locks for locking database are the S-lock, IS-locks, and the IX- locks. The locks are used mainly for control purpose[ that is when a data is been used by a lot of people, the locks make sure that there is consistency in the data.
The option D is correct that is; ''The moment that X-locks are released will determine the granularity of the locks'' The granularity of the locks simply means the amount in which the data can be locked at the same time.
Answer:
Option D (The granularity of locks)Explanation:
The answer is Option D, The Granularity of locks:
In computer science granularity locking is a locking method used in database management systems (DBMS) and relational databases, and granularity of locks in a database refers to how much of the data is locked at one time and it is determined when S locks are released which means Shared Locks.
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Passengers get on a plane in Phoenix at 8:00 A.M. and fly to Los Angeles and land at 8:00 A.M. How can that possible?
Answer:
Because of time zones?
Explanation: The only thing that would make sense to me is the time zones.
What is the conjugate acid of the acetate ion?
Answer:
Hydronium ion is the conjugate acid of water.
Exaplination:Acetic acid is the conjugate acid of acetate ion. Hydronium ion is the conjugate acid of water.
The largest Alkali metal is ?
Answer:
cesium is the largest alkali metal.
Explanation:
Answer:
Cesium
Explanation:
Cesium is the largest atom among alkali metal.
If a gas at 315 k has a volume of 1.50 l , what is the volume of the gas when the temperature is reduced to 215 k
Answer:
1.02 L.
Explanation:
For this problem, you have to apply one of the gas laws --Charles' Law. It is as follows: V1/T1 = V2/T2. Substituting the values in and using sig figs, we get 1.02 L.
Answer:
1.02
Explanation:
An atom gains two electrons. What is the overall charge now?
describe manganese as oxidizing agent
Answer:
See explanation
Explanation:
A reducing agent in chemistry is any substance that accepts electrons and its oxidation number is decreased in a redox reaction.
Manganese occurs in a variety of oxidation states; +7, +6, +5, +4, +3, +2. This makes it an exceptionally good reducing agent since it can accept different number of electrons and change from one oxidation state to another.
The commonest compound of manganese used as a strong oxidizing agent is KMnO4 in which manganese has an oxidation number of +7.
hich of the following is a typical cost associated with renting?
a.
closing costs
b.
down payment
c.
property tax
d.
security deposit
Answer:
D
Explanation:
The other three are related to
a. selling a home
b. buying a home
c. owning a home
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which object is a good conductor of heat and electricity?
A. rubber tires
B. rubber boots
C. metal gate
D. wooden sign
Answer:
C
Explanation:
Metals are good conductors of heat
`Suppose you have a sample of NaOH (0.0315 L, to be exact). If this amount of NaOH is used to exactly titrate 0.0250 L of HCl that has a concentration of 0.105 M, what is the molarity of the NaOH? HINT: Remember to first get your balanced equation.
Answer:
0.0835 M
Explanation:
Step 1: Write the balanced equation
NaOH + HCl ⇒ NaCl + H₂O
Step 2: Calculate the reacting moles of HCl
0.0250 L of 0.105 M HCl react.
0.0250 L × 0.105 mol/L = 2.63 × 10⁻³ mol
Step 3: Calculate the reacting moles of NaOH
The molar ratio of NaOH to HCl is 1:1. The reacting moles of NaOH are 1/1 × 2.63 × 10⁻³ mol = 2.63 × 10⁻³ mol.
Step 4: Calculate the molarity of NaOH
2.63 × 10⁻³ moles of NaOH are in 0.0315 L of solution.
M = 2.63 × 10⁻³ mol / 0.0315 L = 0.0835 M
To determine the mass of CO2 that forms from a given mass of CaCO3, which of the following must be known? Check all that apply.
To determine the mass of CO₂, the following must be known :
the molar mass of CaCO₃ the mole ratio of CaCO₃ to CO₂ the molar mass of CO₂Further explanationReaction
Decomposition of CaCO₃
CaCO₃ ⇒ CaO + CO₂
Given the mass of CaCO₃, so to determine the mass of CO₂ :
1. Find the mol of CaCO₃ from the molar mass of CaCO₃
[tex]\tt n_{CaCO_3}=\dfrac{mass~CaCO_3}{MW~CaCO_3}[/tex]
2. Find the mole ratio of CaCO₃ : CO₂(from equation = 1 : 1)
[tex]\tt n_{CaCO_3}\div n_{CO_2}=1\div 1[/tex]
3. Find the mass of CO₂ from the molar mass of CO₂
[tex]\tt mass_{CO_2}=n_{CO_2}\times MW_{CO_2}[/tex]
Answer:
1 3 and 5
Explanation:
Define wavelength and identify TWO points that could be used in the diagram to measure it.
—————————Are formed by a combination of two or more different kinds of Atom
Atom of the same ———————————-element have identical properties
Answer:
1. molecules.
2. size ,shape and mass.
An unknown compound has the following chemical formula: where stands for a whole number. Measurements also show that a certain sample of the unknown compound contains of nitrogen and of oxygen. Write the complete chemical formula for the unknown compound.
The question is incomplete, the complete question is;
An unknown compound has the following chemical formula:
N2Ox
where x stands for a whole number.
Measurements also show that a certain sample of the unknown compound contains 3.7 mol of oxygen and 2.45 mol of nitrogen.
Write the complete chemical formula for the unknown compound.
Answer:
The complete formula of the compound is N2O3.
Explanation:
Given;
Number of moles of N = 2.45 moles
Number of moles of O = 3.7 moles
Chemical formula of unknown compound = N2Ox
From the ratio of the number of moles of N to O;
2/x = 2.45/3.7
2 * 3.7 = x * 2.45
x = 2 * 3.7/ 2.45
x =3
Hence the complete formula of the compound is N2O3.
How many moles of oxygen would
be consumed to produce 68.1 g
water?
Answer:
4.75 moles of oxygen would be consumed by water
Explanation:
Given data:
Mass of water produced = 68.1 g
Number of moles of oxygen consumed = ?
Solution:
Chemical equation:
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
Number of moles of water:
Number of moles = mass/molar mass
Number of moles = 68.1 g/ 18 g/mol
Number of moles = 3.8 mol
Now we will compare the moles of water with oxygen.
H₂O : O₂
4 : 5
3.8 : 5/4×3.8 = 4.75 mol
Answer: 4.75 moles of oxygen
Explanation:
4. Which type of molecule forms a bilayer within a cell membrane?
Answer:
The answer is Phospholipids.
Explanation:
A phospholipid bilayer. Phospholipids spontaneously form stable bilayers, with their polar head groups exposed to water and their hydrophobic tails buried in the interior of the membrane.
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Acetylene C2H2 gas is often used in welding torches because of the very high heat produced when it reacts with oxygen O2 gas, producing carbon dioxide gas and water vapor. Calculate the moles of carbon dioxide produced by the reaction of 1.60mol of acetylene. Be sure your answer has a unit symbol, if necessary, and round it to 3 significant digits.
Answer:
3.20 moles of carbon dioxide
Explanation:
The reaction of C₂H₂ with O₂ is:
C₂H₂ + 5/2O₂ → 2CO₂ + H₂O
Where 1 mole of acetylene produce 2 moles of carbon dioxide.
Based on the chemical equation of this reaction, there are produced twice the moles of acetylene in moles of carbon dioxide assuming a compete reaction.
If 1.60 moles of acetylene reacts there are produced:
1.60 moles * 2 =
3.20 moles of carbon dioxidewrite the general formula of a. alkane b. aikyl radicals radicals
Answer:
General formula of alkanes is: [tex]C_{n}H_{2n+2}[/tex]
General formula of alkyl: [tex]C_{n}H_{2n+1}[/tex]
PLEASE HELP. ONLY IF YOU KNOW THE ANSWER
Answer:
24. B
25. B
26. B
Explanation:
24. As depicted in the image attached, all living organisms including animals undergo cellular respiration, which is the process whereby sugar molecule is broken down to release energy (ATP). In this process, CARBON DIOXIDE (CO2) is released as a product. The equation is as follows:
C6H12O6 + 6O2 → 6CO2 + 6H2O + energy
On the other hand, plants undergo a unique process called photosynthesis in order to synthesize their food (sugars) and hereby release oxygen gas in the process. Based on the diagram in option B, plants release oxygen using CO2, while animals release CO2 using O2.
25. The structure depicted in the image of this question is an organelle called MITOCHONDRIA. The mitochondrion is the site of cellular respiration (Krebs cycle and ETC) in eukaryotic cells.
26. Photosynthesis is a metabolic process unique to the cells of autotrophic organisms like green plants. It is the process where they synthesize their food in form of organic molecules using SUNLIGHT as a source of energy.
6CO2 + 6H2O + sunlight → C6H12O6 + 6O2
what are the 5 steps to drawing a lewis structure??
What is electronegativity
Answer:
Electronegativity, symbol χ, measures the tendency of an atom to attract a shared pair of electrons (or electron density). An atom's electronegativity is affected by both its atomic number and the distance at which its valence electrons reside from the charged nucleus. The higher the associated electronegativity, the more an atom or a substituent group attracts electrons.
how many atoms of San are in 0.796 moles of this element
Answer:
4.8× 10²³ atoms
Explanation:
Given data:
Number of moles of San element = 0.796 mol
Number of atoms present = ?
Solution:
Avogadro number:
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
0.796 mol × 6.022 × 10²³ atoms / 1mol
4.8× 10²³ atoms
you take 295.5 g of a solid at 30.0 c and let it melt in 425 g of water. the water temperature decreases from 85.1 c to 30.0 c. calculate the heat of fusion of this solid
Answer:
[tex]\Delta _{fus}H=332 \frac{J}{g}[/tex]
Explanation:
Hello!
In this case, since the heat of fusion of a solid substance stands for the energy required to melt it, which is a phase transition from solid to liquid, we can see that the heat lost by water is that gained by the solid, so we can write:
[tex]Q_{solid}=-Q_{w}[/tex]
Thus, by using the water data and its specific heat (4.184), we obtain:
[tex]Q_{solid}=-m_{w}C_{w}(T_f-T_i)\\\\Q_{solid}=-425g*4.184\frac{J}{g\°C}*(30.0-85.1)\°C\\\\ Q_{solid}=97,978.82J=98.0kJ[/tex]
Next, since the heat of fusion of a substance is usually represented in terms of energy per amount of substance, we use the mass of solid to obtain:
[tex]\Delta _{fus}H=\frac{98.0kJ}{295.5g}\\\\ \Delta _{fus}H=0.332\frac{kJ}{g}=332 \frac{J}{g}[/tex]
Best regards!
The heat of fusion of the solid is 0.332 KJ/g or 332 J/g
We'll begin by calculating the heat loss by the water. This can be obtained as follow:
Mass of water (M) = 425 g
Initial temperature of water (T₁) = 85.1 °C
Final temperature (T₂) = 30 °C
Change in temperature (ΔT) = T₂ – T₁ = 30 – 85.1 = –55.1 °C
Specific heat capacity of water (C) = 4.184 J/gºC
Heat loss (Q) =?Q = MCΔT
Q = 425 × 4.184 × –55.1
Q = –97978.82 J
Divide by 1000 to express in KJ
Q = –97978.82 / 1000
Q = –97.98 KJ Finally, we shall determine the heat fusion of the solid.Heat loss by water = –97.98 KJ
Heat gained by the solid (Q) = 97.98 KJ
Mass of solid (m) = 295.5 g
Heat of fusion (Hf) =?Q = m•Hf
97.98 = 295.5 × Hf
Divide both side by 295.5
Hf = 97.98 / 295.5
Hf = 0.332 KJ/g or 332 J/gLearn more: https://brainly.com/question/15563205
what deos sedimentation mean
Answer:
This is the tendency for particles in suspension to settle out of fluid in which they are contained and come to rest against a barrier.
Explanation:
In sedimentation, the particles are in a fluid and under the influence of forces , for example, gravitational forces, they settle and then come to rest when faced with a barrier.
The settling process is the process in which the particles fall out of liquid and sedimentation is the end of the process.
Which trait can a plant acquire during its lifetime?
O A. A damaged stem
OB. A blue flower color
O C. A long, narrow leaf shape
O D. A smooth seed texture
Answer:
OB
Explanation:
wat does aquire mean
Answer:
a
Explanation:
a damaged stem
How is the name of each element in the periodic table represented? A. The first two letters of the element's name are used for the table. B. Letters are assigned to each element by the scientist who discovered it. C. Letters are given to represent each element based on when it was discovered. D. One or two letters are used to represent the name of each element.
Answer:
D. One or two letters are used to represent the name of each element.
Explanation:
The name of each element in the periodic table is symbolized by one or two letters.
There different ways of achieving this. Sometimes;
the first letter of the name of the element is used to represent it for example, hydrogen = H the first two letters are sometimes used, for example Calcium Cathe Latin name is also used for example Gold is Aurum and is represented as Au.These are some of the ways of symbolizing the name of each element
a mixture of of sand,salt and sawdust was stirred into water and the mixture was allowed to stand.
a)how might you collect "pure" sawdust?
b)what is the sediment which forms?
c)the clear liquid was poured off and divided into 2 parts.one part was evaporated,and the other was distilled.
i)what substance would be collected by distillation?
ii)what would be collected by evaporation?
iii)what difference in properties allows the separation in both evaporation and distillation?
Answer:
A) To get the pure sawdust u can filter it..
B) The muddy sagment that will form .
C) The clear liquid can divide into 3 layers on the top there will be pure water in middle there will be muddy or dark layer of water and in lower layer there will be the stones or heavy particles of water .
