Answer:
coiled threads of DNA
Explanation:
Chromosomes are long stretches of DNA packed together by proteins.
UNIT 4: Name/Writing Chemical Compounds Worksheet
Name the following ionic compounds
Ionic compound is defined as those which contains ion and are held together by the attractive forces among the oppositely charged ions.
The names of the ionic compounds is given above and is the most appropriate answer.
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Which metal in the fourth period is the least reactive? Explain your reasoning
Answer:
Krypton
Explanation:
It is a noble gas, so it isn't reactive since it already has 8 valence electrons.
In the balanced equation Cu + 2 HCl --> CuCl2 + H2, if you start with 0.15mol Cu and 0.38mol HCl, how many moles of HCl are left over (which means unused)?
This problem is providing a chemical reaction between 0.15 mol of copper and 0.38 mol of HCl and asks for the moles of HCl that are left over. At the end, the answer turns out to be 0.08 mol.
Uses of stoichiometryIn chemistry, we define stoichiometry as a tool allowing to calculate mole-mass or mole-mole relationships between different species involved in a chemical reactions.
In this case, for 0.15 mol of copper and 0.38 mol of HCl one can apply a mole ratio in order to calculate the moles of HCl consumed by the former, considering the 1:2 mole ratio between them:
[tex]0.15 molCu*\frac{2mol HCl}{1molCu} \\\\=0.30 mol HCl[/tex]
This means that if 0.30 moles of HCl react and 0.38 moles are available, there is a left over or unused moles of:
[tex]leftover=0.38mol-0.30mol\\\\leftover=0.08mol[/tex]
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1.A space shuttle's wings are useless as it travels around the exosphere. Explain, in your own words, why the wings are so useless and how the shuttles can move around.
2.Explain, in your own words, the thermosphere and the stratosphere are our hottest atmosphere layers.
3.Explain, in your own words, how and why “shooting stars” occur. For example, why and what causes meteors to burn up.
4.Explain, in your own words, the importance of our ozone layer in the stratosphere.
5.Explain, in your own words, why weather only occurs in the troposphere.
PLEASE HELP!!!!! Use your own words please! I will give the brainiest to the person who answers it!
Thrust acts on the spacecraft and propels in the space.
How space shuttles move?1. The force created by the shuttle's engines in expelling the burning fuel produces an equal thrust in the opposite direction. This thrust acts on the spacecraft and propels in the space.
2. The thermosphere and the stratosphere are our hottest atmosphere layers because these two layers are present near the sun as compared to other layers of atmosphere.
3. When the meteors hit the atmosphere, meteors rub against air particles and create friction which is heating the meteors. The heat vaporizes most meteors, creating what we call shooting stars.
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Pls help one chemistry question :/
In the following reaction, the energy of the reactants is 860 kJ/mol and the bond energy of the products is 680 kJ/mol. What is the total energy of the reaction? Is the reaction endothermic or exothermic?
A. 1340 kJ/mol, endothernic
B. 180 kJ/mol, endothernic
C. -180 kJ/mol exothermic
D. -1340 kJ/mol exothermic
The heat of reaction is 180 kJ/mol hence the reaction is endothermic.
What is bond energy?Bond energy is the energy that is required to form a bond and must be supplied in order to break the bond. In the question, we are told that the energy of the reactants is 860 kJ/mol and the bond energy of the products is 680 kJ/mol.
Heat of reaction = Bond energy of reactants - Bond energy of products
= 860 kJ/mol - 680 kJ/mol = 180 kJ/mol hence the reaction is endothermic.
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Antibiotics are drugs used to kill bacteria. Some bacteria develop mutations that make them resistant to
antibiotics.
Which of the following BEST explains this mutation with respect to bacteria?
The mutation is a harmful mutation since many bacteria will be killed by antibiotics
The mutation has no effect since the bacteria cannot be targeted by an antibiotic.
The mutation is a helpful mutation since it helps bacteria to survive and reproduce.
The mutation is a helpful mutation since humans can survive longer.
The mutation is a helpful mutation since it helps bacteria to survive and reproduce.
Consider the chemical equilibrium of a soap that is present in its aqueous solution. C17H35COONa(aq) Double headed arrow. C17H35COO–(aq) Na (aq) sodium stearate (soap) stearate ion What will happen if a large quantity of NaCl is added to the aqueous solution? The equilibrium will shift to the right, favoring the dissociation of soap in aqueous solution. The equilibrium will shift to the left to such an extent that it leads to the precipitation of solid soap. The equilibrium will not be affected by the addition of NaCl to the solution. The equilibrium will be permanently destroyed by the addition of NaCl.
The chemical equilibrium has the concentration of reactants and products equal. The addition of NaCl shifts the equilibrium towards the left, leading to soap precipitation.
What is a common ion effect?The chemical equation for the reaction is:
[tex]\rm C_{17}H_{35}COONa\;\leftrightharpoons C_{17}H_{35}COO^-\;+\;Na^+[/tex]
The addition of NaCl to the reaction results in the dissociation of Na and Cl ions.
At the equilibrium condition, the concentration of all the species is equal. The addition of NaCl results in an increase in the product concentration in the solution, with the common ion effect.
The increase in the product concentration results in the reaction moving towards the reactant formation and process in the left direction.
Thus, the addition of NaCl shifts the equilibrium towards the left, leading to soap precipitation. Thus, option B is correct.
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Answer:
the correct answer is (B The equilibrium will shift to the left to such an extent that it leads to the precipitation of solid soap.)
i just took the test
Explanation:
Which compound accumulates in the metabolic disorder alkaptonuria?.
Sofia is doing a presentation on the history of blood analysis. Who is she MOST likely to mention in her presentation?
A. Karl Landsteiner
B. Sir Edward Henry
C. Cora Crippen
D. Trenton Luminol
Answer:
A. Karl Landsteiner is the most likely for her to mention.
All people who are asked to testify in a criminal case must first be issued a subpoena by law enforcement.
A. True
B. False
Answer:
Option B
Explanation:
All people who are asked to testify in a criminal case must first be issued a subpoena by law enforcement, is a "false statement" or option B. A subpoena is a request to appear in court which is usually given out by the attorneys who are a part of the case, the law enforcement does not give out subpoenas, so this is indeed a false statement.
Hope this helps.
Answer: B
Explanation:
A car is driving down the road. It starts from rest. It speeds up to a speed of 10 m/s.
Does the car accelerate? If so, is its acceleration positive or negative? Explain
Answer:
If the speed is increasing, the car has positive acceleration. When the car slows down, the speed decreases. The decreasing speed is called negative.
the constant diameter of the double helix is ensured because hydrogen bonding is always between a(n)
We can confirm that the diameter of the double helix structure of DNA stays the same because hydrogen bonding is always between the A and T bases and the G and C bases.
What are these bases in DNA?The AGCT bases in DNA are the nucleotides that comprise it. These nucleotides include
Adenine Cytosine GuanineThymineBy always bonding adenines with thymine and Guanine with cytosines, the DNA strand maintains a constant diameter.
Therefore, we can confirm that the diameter of the double helix structure of DNA stays the same because hydrogen bonding is always between the A and T bases and the G and C bases.
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which of the following groups use accounting information a.the tax department. b.business owners. c.investor. d.all of above
Answer:
D
Explanation:
if they didn't all use accounting skills and info I'd be considered
Please help!!
Trevor watches as a freight train passes. He counts eight identical black railroad cars, then a red car, followed by several more black cars. Which type of organic compound does the train most closely model?
A. an alkyl halide
B. an aldehyde
C. an ether
D. a carboxylic acid
Answer:
C. an ether
Explanation:
Guys help me, for me this is so hard i can't search this. I Brainliest the Best Answer.
Hope you could understand.
If you have any query, feel free to ask.
HELP PLEASE!!!!!! I will give 100 points!!!!!
S + 6 HNO3 --> H2SO4 + 6 NO2 + 2 H2O
In the above equation how many moles of H2SO4 can be made when 87 moles of HNO3 are consumed?
Answer:
what do you need help with .
Explanation:
?
Answer:
Based on stoichiometry HNO3 to H2O is 6:2
Use 9 grams to find the moles of HNO3
9 grams/63g/mol=0.143 moles of HNO3
HNO3:H2O
6:2
0.143*2/6=0.048
H2O moles is 0.048moles
Mass of water =0.048moles*18g/mol=0.864g
To the nearest tenth=0.9grams
( sorry if its not right)
The ability of materials to act as conductors and insulators is relative. All materials, even those that are commonly classified as insulators, still allow some conduction of heat. For example, ceramic is a better conductor than Styrofoam. A ceramic mug filled with hot water feels warmer in your hand than a Styrofoam cup filled with hot water. However, ceramic is a worse conductor than metal. A metal mug filled with hot water would feel even hotter than the ceramic mug.
Which of the following accurately represents the relationship between ceramic and metal?
A
Metal and ceramic are equally effective conductors.
B
Metal is a better conductor than ceramic.
C
Metal is a better insulator than ceramic.
D
Metal does not conduct heat.
B. Metal is a better conductor then cramic
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. A strong acid, HCl, is titrated with a strong base, NaOH. Write the net ionic equation for the reaction. Do not include spectator ions in the equation.
water is stored where until it is used by the cell
Answer: The water Inside the cell is stored inside the vacuole(s)
Explanation:
Hope this helps :)
4) Type only the NUMBER answer to the question below (no units). Your
answer should have 4 significant figures.
How many grams of N202 are present in 4.5 x 1024 molecules of N2O2
SOMEONE HELP ME PLEASE
what can a chemical reaction be concisely represented by
Results in a net release of energy
Catabolic
Anabolic
Catabolic reactions break down large organic molecules into smaller molecules, releasing the energy contained in the chemical bonds. These energy releases (conversions) are not 100 percent efficient. The amount of energy released is less than the total amount contained in the molecule.
If you throw a ball into the air, the force of ________ makes the ball fall back toward Earth.
A sample of matter is that extreme temperatures with particles moving so quickly that their collisions release electrons from the atoms. This creates a mixture of electrons in positively charged ions with high kinetic energy. What phase of matter does this describe?
A)Gas
B)Liquid
C)Plasma
D)Solid
C)Plasma
.............this was for 20 characters to submit the answer-dont mind this
Matter exists in three different physical states, namely solid, liquid and gaseous state. The plasma is also an another state of matter. The correct option is C.
What is plasma?The plasma is defined as the fourth state of matter. It is a hot ionized gas which consists of approximately equal numbers of positively charged ions and negatively charged electrons. It is not same as the neutral gas.
Since plasma contains electrically charged particles, they are strongly influenced by the magnetic and electric fields while the neutral gases are not. Like gases plasmas have no fixed volume or shape.
The density of plasma is also found to be less than solids or liquids. The plasma is known as a charged gas with strong electrostatic interactions. It is the plasma which make up the sun and stars and it is the most common state of matter in the universe as a whole.
Thus the correct option is C.
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confused as heck. please help!
Answer: that all thre water cycle and C is vaporation
Explanation:
I need help!
Examine the general structure of a molecule.
Which functional groups are in this molecule?
A. an alkyl halide and an alcohol
B. a carboxylic acid and an amine
C. an amine and an ester
D. an aldehyde and a carboxylic acid
Answer:
B,) a carboxylic acid and an amine
Explanation:
A functional group is an atom or group of atoms inside a molecule that has comparable chemical properties anytime it appears in numerous compounds. When other parts of the molecule are not similar, some functional groups react in certain manners.
Carboxylic acid is a carbonyl-containing functional group, with carbon atom bonded to an hydroxyl group on one side and on the other side is either a carbon or hydrogen atom.
An amine group is composed of a nitrogen atom bonded to a combination of carbon and hydrogen atoms.
Answer:
a carboxylic acid and an amine
Explanation:
The atomic number of an atom or element is the number of.
Answer: the number of a chemical element in the periodic system,
Explanation:
Currently, the primary source of sulfur dioxide emissions into the atmosphere is Group of answer choices coal burning power plants. plastic manufacturing. gasoline-powered lawnmowers. diesel trucks.
From what we know we can confirm that currently, the primary source of sulfur dioxide of emissions into the atmosphere is coal and other fossil fuel burning in industry.
What are the consequences of Sulfur dioxide in the atmosphere?From what we know, this compound has proved to be quite toxic for humans to breathe. Increased concentrations of this in the atmosphere lead to increased rates of lung disease among other health complications.
Therefore, we can confirm that the primary source of sulfur dioxide of emissions into the atmosphere is coal and other fossil fuel burning in industry.
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How do plants affect the amount of carbon in Earth’s atmosphere?
Question 1 options:
Plants increase the levels of carbon dioxide in the atmosphere due to the process of photosynthesis.
Plants have no effect on the amount of carbon in the atmosphere
Plants decrease the levels of carbon dioxide in the atmosphere due to the process of photosynthesis.
Answer:
c
Explanation:
plants decrease the levels of carbon dioxide in the atmosphere due to the process of photosynthesis