Answer:
A. 46
Explanation:
Human cells normally contain 23 pairs of chromosomes, for a total of 46 chromosomes in each cell .
According to the kinetic molecular theory, the molecules of an ideal gas is
Answer:
exert no attractive forces on each other, or on the walls of the container
Explanation:
Can someone please help me? :(
Answer:
A. Each type of cell carries out a specific function for the organism.
Explanation:
[tex]hope[/tex] [tex]this[/tex] [tex]helps![/tex] [tex]:)[/tex]
Which is the goal of technology?
to expand comprehension
to make life easier
to apply knowledge
to improve communication
Answer:
B. To make life easier.
Explanation:
Although all of the above makes sense, the answer should be B. because it is to help improve how we live.
I hope it helps! Have a great day!
Muffin~
The goal of technology is to make life easier.
What is goal?A goal is "an idea of the future or desired result that a person or a group of people envision, plan and commit to achieve".
What is technology?
Technology is "the use of scientific knowledge for practical purposes or applications, whether in industry or in our everyday lives".
Hence, the goal of technology is to make our life better.
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please answer thank tou
Answer:
ion
Explanation:
more protons than electrons
How many nitrate ions are in 2 mol of iron (II) nitrate
Answer:
Two
Explanation:
Nitrate has a charge of negative 1 and the Iron (II) tells us the iron in that formula has a charge of +2, so in order for the iron to have to equal positive two, there has to be two negative. Since on nitrate ion is -1, you need two to make -2.
NEED HELP ASAP!!! WILL MARK BRAINLIEST!!! A scuba tank can hold 18 L of air 6 atm of pressure. If the gas were to be released all underwater at 4 atm, it would take up how much volume assuming that the temperature remained constant?
[tex]\qquad\qquad\huge\underline{{\sf Answer}}♨[/tex]
If temperature remains constant, then we can apply the formula :
[tex]\qquad \tt \dashrightarrow \:p_1v_1 = p_2v_2[/tex]
[tex]\qquad \tt \dashrightarrow \:4 \times v_1 = 6 \times 18[/tex]
[tex]\qquad \tt \dashrightarrow \: v_1 = 108 \div 4[/tex]
[tex]\qquad \tt \dashrightarrow \:v_1 = 27[/tex]
So, the required volume is 27 litres
Please help !!!!! I need this for Chemistry class
Answer: Silver has the highest temp. change and water has the lowest temp. change.
Explanation:
According to the specific heat capacity, water has lowest specific heat and greatest is that of silver owing to their temperature differences.
What is specific heat capacity?
Specific heat capacity is defined as the amount of energy required to raise the temperature of one gram of substance by one degree Celsius. It has units of calories or joules per gram per degree Celsius.
It varies with temperature and is different for each state of matter. Water in the liquid form has the highest specific heat capacity among all common substances .Specific heat capacity of a substance is infinite as it undergoes phase transition ,it is highest for gases and can rise if the gas is allowed to expand.It is different for different substances.
It is given by the formula ,
Q=mcΔT
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What is an ionic solid?
A. A crystalline solid held together by a shared electron pool
B. A crystalline solid held together by dipole-dipole forces
C. A crystalline olid held together by covalent bonds
D. A crystalline solid held together by charge attractions
Answer:
D
Explanation:
An ionic solid is a crystalline solid held together by charge attractionsAn example is a salt crystal (Na⁺ + Cl⁻ → NaCl)An ionic solid is a crystalline solid held together by charge attractions or an ionic bond.
What is an ionic bond?
Ionic bond or electrovalent bond is a type of bond which is formed between two elements when there is an exchange of electrons which takes place between the atoms resulting in the formation of ions.
When the atom looses an electron it develops a positive charge and forms an ion called the cation while the other atom gains the electron and develops a negative charge and forms an ion called the anion.
As the two atoms are oppositely charged they attract each other which results in the formation of a bond called the ionic bond.They are good conductors of heat and electricity. They have high melting points. These compounds are brittle.
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What is the pressure in atm of a 5. 00 l tank with 2. 50 moles of oxygen
at 39. 3 °c?
1
4
7
Answer:
1
Explanation:
Vascular plants have an internal transport system to move water and nutrients throughout the plant. Which of these is used to transport water from the roots to the leaves?
How many hybrid orbitals form when three atomic orbitals of a central atom mix?.
Answer:
three _ _E _ _ _
Explanation:
The element that doesn't occur in elemental state in nature is
Answer:
technetium, atomic number 43; promethium, number 61; astatine, number 85; francium, number 87; neptunium, number 93; and plutonium, number 94.
Explanation:
What is a technique for gene therapy?
Answer:
For gene therapy, stem cells can be trained in a lab to become cells that can help fight disease. Liposomes. These fatty particles have the ability to carry the new, therapeutic genes to the target cells and pass the genes into your cells' DNA.
Mark me as brainlest please!
Why is it possible to compress a gas
Answer:
Gas can be compress easily than liquid or solid because, molecules are more spread in gas than solin or liquid.
Brainliest if this helps you. please
I need a mnemonic for the reactivity server of metals please
Potassium
Sodium
Lithium
Calcium
Magnesium
Aluminium
Carbon
Zinc
Iron
Nickel
Tin
Lead
Hydrogen
Copper
Mercury
Silver
Gold
Platinum
Explanation:
Lithium Sodium Potassium group 1
Hydrogen proton +1
Iron Fe2+
calculate the oxidation state of the underlined elements of K2 Cr2 O7
-----
Answer:
+4
Explanation:
In PbO2, oxygen exhibits an oxidation number of -2 (since it's not a peroxide or superoxide):
Let the oxidation number of Pb be x. Then, for the compound to be neutral, the oxidation numbers of all atoms should add up to zero.
⇒ x + (−2) + (−2) = 0
x = +4
So the oxidation no. of Pb is +4.
I hope this helps.
Which scientist first applied DNA Analysis techniques to crime scene evidence?
a)Tommy Lee Andrews
b)Colin Pitchfork
c)Stephen Jones
d)Alec Jeffreys
Carbon 14 decays to Carbon 12 and has a half-life of 5730 years. If a fossil is analysed and it has 5 grams of Carbon 14 and 15 grams of Carbon 12, how old is the fossil?
Answer:
im sorry but this question doesnt make sense
Explanation:
what is the result of cell division that includes mitosis?
A. new cells with different chromosomes
B. four cells with new chromosomes
C. two identical new cells
D. one genetically different cell
Answer:
I think C is the answer
Explanation:
because Mitosis results in two identical daughter cells......
What are the five major lines of latitude?
Answer: Arctic Circle, Tropic of Cancer, Equator, Tropic of Capricorn, and the Antarctic Circle. Hope this helps.
What is the mode of action of sulfonamides?
inhibition of protein synthesis
inhibition of cell wall synthesis
disruption of folic acid synthesis
disruption of membrane structure
Answer:
b is the correct answer inhibition of cell wall
Hey there!
Sulfanilamide is the classification of the antibiotics that can target the bacteria that’s causing infections.
But the action of the mode of sulfanilamide is: binding of a specific enzyme which simply translates to inhibition of the cell wall
Thus, your answer is: inhibition of cell wall synthesis (Option B.)
Good luck on your assignment & enjoy your day!
~Amphitrite1040:)
How may using sorbents to clean an oil spill be helpful to the ecosystem?
Answer:
Are sorbents good for the environment?
Natural Inorganic Sorbents
Second, sorbents that sink should not be used as they could be harmful to the environment. Sinking is a problem with many sorbents, such as untreated peat moss, most inorganic sorbents, and many wood products.
Its major result is to clean out some surface contaminants, which makes it simpler for oil to absorb. On the other hand, pyrolysis, a high-temperature thermal treatment, causes the sorbent to carbonise. In turn, this greatly improves the oil sorption capacity and oil to water selectivity.
What are the advantages of using sorbents?When recovering adsorbent materials that cause secondary contamination, lighter, less viscous oil is lost through the pores more readily than heavier, more viscous oils. Application is simple because sorbents can be applied automatically or manually to spills using blowers or fans.
The best sorbents for recovering oil are typically synthetic ones. In some circumstances, a weight ratio of 40:1 for oil to sorbent can be reached, as opposed to 10:1 for organic compounds and only 2:1 for inorganic materials.
A substance used to absorb or adsorb liquids or gases is known as a sorbent. Examples comprise: a substance that works via adsorption and is comparable to molecular sieve material (attracting molecules to its surface). It has strong thermal conductivity and a big interior surface area.
Thus, On the other hand, pyrolysis, a high-temperature thermal treatment, causes the sorbent to carbonise.
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What component of the human epidermis functions to make the skin's surface extremely tough and resistant to bacterial enzymes?
keratin
proteases
dermis
hypodermis
Answer:
Keratin :)
Explanation:
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Please rate and mark brainliest!!
Can someone please help me?? :(
Answer:
A and B is the answer
Answer:
option b
Explanation:
Check all reasons why a book was used.
it increased pressure on the gas.
it supported additional weights.
it balanced the syringe.
We can confirm that for the experiments regarding Boyle's law, the book was used to increase pressure on the gas and add additional weight.
Why is the book used in these experiments?The book is used for the reasons described in options 1 and 2 of the question. The book supports additional weights on the container, meaning that through these added weights we can increase the pressure being applied to the gas and see how said pressure affects the volume of a gas.
Therefore, we can confirm that the book was used to increase pressure on the gas and add additional weight.
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Answer: A, B
Explanation: edge2023
I need help with this one.
Magnesium and Calcium Oxide
Trick : Reactants are always on left
Answer:
magnesium and calcium oxide
Explain how DNA can provide some evidence for evolution.
The shared ancestry of life is reflected in DNA and genetic code. DNA comparisons can reveal how closely two species are related. Biogeography. Evolution and geological change are reflected in the global distribution of life and the particular characteristics of island species.
Draw a structural formula for the more stable carbocation intermediate formed in the reaction shown.
A carbocation is a carbon atom that bears a positive charge. The most stable carbocation here must be a secondary carbocation .
What is a carbocation?A carbocation is a carbon atom that bears a positive charge. These species pften pccur as intermediates in a chemical reaction and can be detercted spectroscopically.
The most stable carbocation here must be a secondary carbocation hence, the structural formula for the more stable carbocation intermediate formed in the reaction is shown in the image attached.
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Consider the following reaction: 2 Bi(s) + 3 Cl2(g) → 2 BiCl3(s)
How many grams of chlorine gas are required to produce 3.32 grams of bismuth chloride is
produced? Use correct significant digits and units, for example 1.234 g.
Taking into account the reaction stoichiometry, 1.119 grams of chlorine gas are required to produce 3.32 grams of bismuth chloride is produced.
Reaction stoichiometryIn first place, the balanced reaction is:
2 Bi + 3 Cl₂ → 2 BiCl₃
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Bi: 2 molesCl₂: 3 moles BiCl₃: 2 molesThe molar mass of the compounds is:
Bi: 209 g/moleCl₂: 70.90 g/moleBiCl₃: 315.45 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Bi: 2 moles ×209 g/mole=418 g
Cl₂: 3 moles ×70.90 g/mole= 212.7 g
BiCl₃: 2 moles ×315.45 g/mole= 630.9 g
Mass of Cl₂ requiredThe following rule of three can be applied: If by reaction stoichiometry 630.9 grams of BiCl₃ are formed by 212.7 grams of Cl₂, 3.32 grams of BiCl₃ are formed by how much mass of Cl₂?
[tex]mass of Cl_{2} =\frac{3.32 grams of BiCl_{3}x212.7 grams of Cl_{2} }{630.9 grams of BiCl_{3}}[/tex]
mass of Cl₂= 1.119 grams
Finally, 1.119 grams of chlorine gas are required to produce 3.32 grams of bismuth chloride is produced.
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Mass number is the number of?
Answer:
mass is the amount of matter in an object
Explanation:
