Evidence in the fossil record points to major asteroid impacts that have caused mass extinctions in which 50%–96% of life on Earth died out.
Answer:
5
Explanation:
Identify the shape of the molecules that could result from each of the hybrid orbitals given below.
Check all of the boxes that apply.
sp^2-orbitals
O bent
O tetrahedral
O trigonal planar
Explanation:
The 5s,5p and 5d orbitals hybridise to form seven sp3 d3 hybrid orbitals. The molecule is then formed with 7 fluorine atoms. The geometry of this molecule is pentagonal bipyramidal . Five F atoms are in one plane directed at corners of a pentagon (equatorial position), with 72º angle between them.
please Mark as brainliest and follow
Answer:
bent and trigonal planar
Explanation:
By what means (or force) can the atoms in compounds be separated?
Answer:
chemical means
Explanation:
Compounds can be separated by chemical means physical means boiling pressure
What are the uses for carbon?
Am I really stupid for not knowing this ;-;
Answer:
A. Gases;nonreactive
Explanation:
No ur not stupid, lol hope this helps!
Answer:
other dude is right also you aren't another thing sorry I be late
Explanation:
Observations made during an experiment are called:
A. Data
B. Problems
C. Conclusions
D Questions
I think A
Answer:
Data
Explanation:
You are right
The molecular formula of butane is C4H10C4H10. It is obtained from petroleum and is used commonly in LPG (Liquefied Petroleum Gas) cylinders (a common source of cooking gas). It has two arrangements of carbon atoms: a straight chain and a branched chain.
Required:
a. Using this information, draw the structure of the tertiary butyl radical that will form upon removal of a hydrogen atom.
b. Draw the molecule on the canvas by choosing buttons from the Tools (for bonds), Atoms, and Advanced Template toolbars.
Answer:
Explanation:
Butane is an alkane with the molecular formula C₄H₁₀.
(a) It has two structural isomers (n-butane and 2-methylpropane) shown below
H H H H
| | | |
H - C - C - C - C - H
| | | |
H H H H
The structure above is n-butane
H CH₃ H
| | |
H - C - C - C - H
| | |
H H H
The structure above is 2-methylpropane and can also be referred to be a tertiary butane because the central carbon atom has 3 methyl groups attached to it as shown below.
CH₃
|
H₃C - C - CH₃
|
H
Hence, the structure of a tertiary butyl radical after loss/removal of a hydrogen atom will be
CH₃
|
H₃C - C⁻ - CH₃
NOTE: It should be noted that the central carbon becomes negatively charged after the loss of the hydrogen atom
(b) This is the practical part of the structure drawn above. The last structure illustrated above can be drawn on the canvas with the instruction provided in the question.
Why do historians analyze historical events and cause and effect relationship
A star produces energy by:
A. expanding and contracting its magnetic field.
B. creating sunspots and releasing coronal ejections.
C. combining two atoms to form a larger atom, releasing energy.
D. splitting atoms apart, releasing energy in the form of photons.
Answer : C
Explanation:
a star produces energy by combining two atoms into one creates a powerful burst of energy
Describe the flow of energy through an ecosystem from the Sun to the plant and ultimately through an animal.
Answer:
Hope this Helps! :)
Explanation:
The word ecosystem refers to the all of the living species as well as non-living elements in a particular environmental area. For instance, a lake, swamp, coral reef, forest, or a prairie would each be considered an ecosystem. Ecosystems can vary greatly in size and individual characteristics -- for instance, the ecosystem of a puddle differs greatly from that of a swath of tundra.
Despite these disparities, all ecosystems function similarly in the way in which energy flows into, through, and out of them through the energy cycle
Energy is transferred into and out of ecosystems via a web of complex interactions. Energy enters an ecosystem from external sources and moves throughout its components. For instance, energy from the sun flows through plants, microorganisms, and animals. Energy cycles in an ecosystem end with decomposition, and then the process begins anew
Essentially, the flow of energy through ecosystems can be explained by who eats what. Keep in mind, however, that energy transfer isn’t perfectly efficient; much of it dissipates as heat at various phases in the cycle.
The energy flows from the sun to the plants by photosynthesis and animal eats plants and energy is transferred from plants to animals.
What is the transfer of energy?The energy transfer isn't entirely efficient because a significant amount of it evaporates as heat at different points throughout the cycle.
Despite these differences of energy, all ecosystems function similarly in terms of the energy cycle, which governs how energy enters, passes through, and exits them.
Ecosystems receive and expend energy through a network of intricate interconnections. An ecosystem receives energy from outside sources, which circulates among its parts.
Thus, as a result of photosynthesis, energy is transmitted from the sun to plants, which are then consumed by animals.
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What is the density of a piece of cement has a mass of 8.76 g and volume of 3.07 cm^3?
Answer:
2.85g/cm^3
Explanation:
density = mass/volume
density=8.76g/3.07cm^3= 2.85g/cm^3
Answer:
The answer is 2.85 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question we have
[tex]density = \frac{8.76}{3.07} \\ = 2.85342019...[/tex]
We have the final answer as
2.85 g/cm³Hope this helps you
How would you convert 500cc of 2M H2SO4 into g/l?
Answer:
Number of replacable H
+
ions in H
2
SO
4
=n=2
Normality =n× Molarity=2×2=4 N
HURRY
Show step-by-step
2A + 5B --> 3C + D
2.0 mol A and 4.0 mol B react to form 1.8 mol C. What is the PERCENT YIELD of this reaction?
Answer:
Percent yield of reaction is 75%.
Explanation:
Given data:
Moles of A = 2.0 mol
Moles of B = 4.0 mol
Moles of C formed = 1.8 mol
Percent yield of reaction = ?
Solution:
Chemical equation:
2A + 5B → 3C + D
We will compare the moles of A and B with C from balance chemical equation.
A : C
2 : 3
B : C
5 : 3
4 : 3/5×4 = 2.4 mol
Number of moles of C formed by 4 moles B are less thus B is limiting reactant and will limit the yield of C.
Percent yield:
Percent yield = actual yield /theoretical yield × 100
Percent yield = 1.8 mol / 2.4 × 100
Percent yield =75%
Can you count how many atoms there are in the following compounds?
you are given the mass of an element, you use the periodic table to find its molar mass, and multiply the given mass by the reciprocal of the molar mass. This is Mass → Moles . Once you have moles, multiply by Avogadro's number to calculate the number of atoms. This is Moles → Atoms
“surely you have gotten into a car on a cool day and noticed that the metal buckle on your seatbelt feels significantly colder than other things in your car, such as the steering wheel or the center console. Explain why this is” someone please help
Answer:
The metal buckle conducts heat away from the hand than both the steering wheel and center console.
Explanation:
Good conductors are materials that allow both heat and electricity to flow easily through them. Examples of good conductors are metals.
Poor conductors or insulators are materials which do not allow both heat and electricity to flow easily through them. Examples of insulators are most non-metals, plastics, rubber, wool, wood, etc.
On a cool day a metallic object like the buckle of a car's seatbelt will easily conduct heat away from the hand than other materials inside the car like the seat, the seatbelt, the steering wheel and the centre console as these materials are made from insulators or poor conductors.
Therefore, the metal buckle will feel colder to touch than other things in the car because it conducts heat away from the hand than both the steering wheel and center console.
what have you observed when you fill in a basin with water? how do you do it?
Answer:
Cautiously and avoiding filling in the central area so that it does not overflow when filling, since being very beach makes filling difficult.
Explanation:
The basins are shallow, that is why filling is difficult, the filling must be slow, low intensity and at the edges not placing the water filling in the center of the basin.
When you fill a basin with liquid water, you can see that the water takes the shape of the container in which it is contained. This is because in the liquid state, water has molecules farther apart than in the solid state.
You can notice this property when performing an experiment with liquid and solid water.
When filling a glass, liquid water takes on the shape of a glass, and solid water, such as an ice cube, remains the same shape when placed in a glass.
Therefore, when filling a basin with water we perceive a property of the physical state of water, in liquid form. Water is one of the few substances that can be found naturally in liquid, solid and gaseous states.
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what is the formula for lead (ll) sulfate
Answer: PbSO4
Explanation: Search on google
Answer:
PbSO4
Explanation:
What is meant by H, and 2H?
Explanation:
H is 1 mole of hydrogen
2H is 2 moles of hydrogen
Which of these solutions would be considered to have a neutral pH?
Ammonia, pH = 9.0
Pure water, pH = 7.0
Coffee, pH = 5.0
Rainwater, pH = 6.0
Answer:
Pure Water.
Explanation:
Solutions with a pH of 1-6 are considered acidic. Solutions with a pH of 8-14 are considered basic. Solutions with a pH of 7 are considered neutral.
I need help with the question they are asking
Answer:
i wish i could help but people are around me
Explanation:
A ball of mass 0.2 kg is dropped from a height of 10 m. How much mechanical energy does it have right before it hits the ground? (Assume there is no air resistance.) Acceleration due to gravity is g = 9.8 m/s2.
Group of answer choices
0 J
10.0 J
19.6 J
25.4 J
Answer:
19.6 J
Explanation:
According to the formula:
M.E.= mgh
50 points will give brainlyest Since thermal energy represents the total energy of the particles in an object, at the same temperature, the larger object will possess more thermal energy.
Question 3 options:
True
False
Answer:
the answer to your question is: true
Thermal energy has been the total amount of energy that has been present in the object. The thermal energy has been directly proportional to the size of the object. Thus, the statement is true, and option a is correct
What is thermal energy?Thermal energy is defined as the energy possessed by the particles of the molecules and atoms that follows the kinetic molecule theory and moves faster and collides with each other when the temperature of the system has been increased.
This type of energy has been known to be passed by the object having to be in the vicinity of the temperature. Thermal energy can flow from one substance to another due to differences in temperature.
Thermal energy has been possessed by fossil fuels like coals, and natural gases, along with electric heat,m solar heat, and geothermal heat. The thermal energy has been directly proportional to the surface area and bigger objects having more surface will be able to hold more energy.
Therefore, the statement about thermal energy and surface area is true.
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Which of the following chemical equations depicts a balanced ionic equation?
Answer:
Option C. 2OH¯ + Ca²⁺ —> Ca(OH)2
Explanation:
OH¯ + Ca²⁺ —> Ca(OH)2
The above equation can be balance as follow:
OH¯ + Ca²⁺ —> Ca(OH)2
There are 2 atoms of OH on the right side and 1 atom on the left side. It can be balance by putting 2 in front of OH¯ as shown below:
2OH¯ + Ca²⁺ —> Ca(OH)2
Next, we shall balanced the charge on both side. This can be obtained as follow:
Total charge on the left side = –2 + 2
Total charge on the left side = 0
Total charge on the right side = 0
Thus, the charge on both side are equal. Hence, the balance ionic equation is:
2OH¯ + Ca²⁺ —> Ca(OH)2
What is the mass in grams of 381 mL of ethylene glycol?
Answer:
38
Explanation:
What is the final temperature of a 5.0g sample of water at 25C If 832 joules of heat are added?
Answer:
64.71C
Explanation:
Given
Mass (m) = 5g
Initial Temperature (T1) = 25C
Heat (Q) = 832 joules
Required
Determine the final temperature
This question will be solved using:
Q = mc∆T
Where c = specific heat = 4.19
Substitute values in the above formula, we have:
832 = 5 * 4.19 * (T2 - 25)
832 = 20.95 * (T2 - 25)
Divide both sides by 20.95
39.71 = T2 - 25
Add 25 to both sides
39.71 + 25 = T2
T2 = 64.71C
6) Which of these elements is a metal?
E) C
D) N
A) O
C) Ne
B) Ca
Answer:
Ca
Explanation:
It is on the left side of the periodic table where metals are located.
Answer:
Ca
Explanation:
Carbon burns with oxygen to produce carbon dioxide gas. Which of these shows the correct chemical reaction? C + O2 → CO2 C, O, CO2 C + O = CO2 CO2 = C + O
Answer:
c+o2=co2
Explanation:
balanced reaction it is correct
Answer:
C + O2 → CO2
Explanation:
i took the test and got it right
Determine the subunit composition of a protein from the following information:Molecular mass by gel filtration: 200 kDMolecular mass by SDS-PAGE: 100 kDMolecular mass by SDS-PAGE with 2-mercaptoethanol: 40 kD and 60 kD
Answer:
Explanation:
The protein comprises of two 60-kD polypeptides and two 40-kD polypeptides. Each one of the 40-kD chains has a disulfide-bond, which is directly bonded to a 60-kD chain.
The 100-kD units attach noncovalently to produce a protein with a molecular mass of 200 kD.
The protein consists of 200 kD in size, and the Gel filtration doesn't affect the relationship and interaction among the various subunits in the protein.
When SDS-PAGE takes place, samples are being subjected to boiling of samples and therefore undergoing denaturation conditions. The result causes disorganization in the 100 kD units.
It implies that BME is responsible for the reduction between the R1-S-S-R2 bond between 40 kD and 60 kD to R1-SH and R2-SH, resulting in separate proteins.
However, the reducing agent (BME) main task is reducing disulfide bonds in a protein.
Which of these is an example of an ecosystem service?
A. A mangrove forest protects a coastal village from erosion.
B. A farmer uses non-chemical means to control pests and weeds.
C. A city enacts a law to protect a local lake from runoff pollution.
D. After closing a mine, a company adds soil and plants native grasses in the area.
someone help me asap.
Answer:
A
Explanation:
All of the other options involve cities, farmers, or companies. Those aren't natural occurrences, so A is the answer. The mangroves protect the village without anything being modified about that environment.
A reaction of chlorine gas with sodium solid creates 45.6 grams of sodium chloride. The mass of sodium and chlorine gas price for the reaction was ___ grams
Answer:
17.94 annd 27.69 respectively.
Explanation:
Na(s) + Cl(g) n` NaCl(s)
mass of NaCl = 45.6 g
Mr of NaCl = 23 + 35.5
= 58.5g/mol
mole of NaCl = mass/Mr
= 45.6/58.5
= 0.78 moles
From the equation;
1 mole of NaCl = 1 mole of Na = 1 mole of Cl
hence 0.78 mol of NaCl = 0.78 mol of Na = 0.78 mol of Cl.
mass of Na = 0.78 × 23
= 17.94 grams
mass of Cl = 0.78 × 35.5
= 27.69 grams
The mass of the sodium and chlorine gas taken for the reaction was 17.92 grams and 27.73 grams respectively.
What is sodium chloride?Sodium chloride is an ionic compound in which the sodium (Na⁺) and chloride (Cl⁻) ions are present in a ratio of 1 : 1. It is commonly known as table salt or halite.
Sodium and chlorine react with each other to generate a substance that is familiar to everybody around the globe which is sodium chloride.
2Na (s) + Cl₂ (g) [tex]\longrightarrow[/tex] 2NaCl (s)
The atomic mass of the sodium (Na) = 23 g/mol
The atomic mass of chlorine,(Cl) = 35.5 g/mol
The molar mass of the sodium chloride (NaCl) = 58.5 g/mol
Given, the mass of the NaCl formed = 45.6 g
If 117 g NaCl formed from sodium = 2× 23 g
Then 45.6 NaCl will be formed from Na = 17.92 g
If 117 g NaCl formed from chlorine = 2× 35.5 g
45.6 NaCl will be formed from chlorine = 2× 35.5 ×45.7/117 = 27.73 g
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