Answer:
intron
Explanation:
Which type of reaction is represented by the generic equation AB + CD AD + CB? combustion decomposition single replacement double replacement
it is a double replacement
Answer:
Double Replacement
Explanation:
which two body systems deliver oxygen to your cells and take away carbon dioxide
Body systems associated with gases(particularly that which was asked):
• Respiratory System.
• Cardiovascular System or Circulatory System or Vascular System.
Note: All these three are the names of the same thing i.e cardiovascular system, circulatory system and vascular system.
How many miles of NaCl are in 250 mL of a 0.4 M solution?
Answer:
There are 0.1 moles of solute in 250 mL of 0.4 M solution.
Explanation:
First, recognize that the molar concentration tells you how many moles of the solute are present in one liter of solution. In a 0.4 M solution, there are 0.4 moles of solute in every liter of solution. You can determine the number of moles of solute in 250 mL of the solution using dimensional analysis.
250 ml . 1L/1000 L . 0.4mol / 1L
Units of liters and milliliters cancel, leaving you with a final answer in units of moles, at 0.1 mol.
Given 6193 mL of a gas at 62.3 °C. What is its volume at 38.1 °C?
Answer:
5746.0 mL.
Explanation:
We can use the general law of ideal gas: PV = nRT.
where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in K.
If n and P are constant, and have two different values of V and T:
V₁T₂ = V₂T₁
V₁ = 6193.0 mL, T₁ = 62.3°C + 273 = 335.3 K.
V₂ = ??? mL, T₂ = 38.1°C + 273 = 311.1 K.
∴ V₂ = V₁T₂/T₁ = (6193.0 mL)(311.1 K)/(335.3 K) = 5746.0 mL.
3. The relationship between two optical isomers is most like the relationship between _____.
an open hand and a closed fist
a bare hand and a gloved hand
a man’s hand and a woman’s hand
a left hand and a right hand
PLEASE EXPLAIN WHY
Answer: option D
Explanation:
Since optical isomers are of 2 types called Enantiomers and Diastereomers
Enantiomers are non super impossible mirror images to each other. Examples, a man's right and left hand, Gloves
Diastereomers are non super impossible non mirror images
How many grams of Na2So4 would be formed if 0.75 moles of NaOH reacted?
Answer:
[tex]\boxed{\text{53 g }}[/tex]
Explanation:
You don't give the reaction, but we can get by just by balancing atoms of Na.
We know we will need the partially balanced equation with masses, moles, and molar masses, so let’s gather all the information in one place.
M_r: 142.04
2NaOH + … ⟶ Na₂SO₄ + …
n/mol: 0.75
1. Use the molar ratio of Na₂SO₄ to NaOH to calculate the moles of NaF.
Moles of Na₂SO₄ = 0.75 mol NaOH × (1 mol Na₂SO₄/2 mol NaOH
= 0.375 mol Na₂SO₄
2. Use the molar mass of Na₂SO₄ to calculate the mass of Na₂SO₄.
Mass of Na₂SO₄ = 0.375 mol Na₂SO₄ × (142.04 g Na₂SO₄/1 mol Na₂SO₄) = 53 g Na₂SO₄
The reaction produces [tex]\boxed{\text{53 g }}[/tex] of Na₂SO₄.
Final answer:
0.75 moles of NaOH would form 0.375 moles of Na2SO4, based on the stoichiometry of the chemical equation provided. The mass of Na2SO4 produced would be 53.25 grams.
Explanation:
The reaction described involves NaOH and amounts to a stoichiometry problem where we determine the amount of a product formed from a given amount of reactant. In the given chemical equation:
4NaOH(aq) + 2S(s) + 302(g) → 2Na2SO4(aq) + 2H₂O(l),
there is a clear stoichiometric relationship between NaOH and Na2SO4. Specifically, 4 moles of NaOH yield 2 moles of Na2SO4, which means 2 moles of NaOH would produce 1 mole of Na2SO4. Given that 0.75 moles of NaOH reacted, they would form half of 0.75 moles of Na2SO4, which is 0.375 moles of Na2SO4. To find the mass in grams, we would need the molar mass of Na2SO4, which is approximately 142 g/mol.
Moles of Na2SO4 formed = (0.75 moles NaOH × 1 mole Na2SO4) / 2 moles NaOH
Mass of Na2SO4 formed = 0.375 moles × 142 g/mol = 53.25 grams.
Check all the boxes that describe the electron sea model. It is the simplest metal bonding model. It is the most complicated metal bonding model. Metallic bonding results from the transfer of valence electrons. Metallic bonding results from the sharing of valence electrons. The electrons are delocalized. The electrons are attracted to specific nuclei. The delocalized electrons serve as the glue that keeps the metal atoms together. The electrons that are attracted to specific nuclei serve as the glue that keeps the metal atoms together.
In the electron sea model, metallic bonding is characterized by delocalized electrons freely moving around the metal ions, serving as a 'glue' that holds the atoms together. This model is known as the simplest metal bonding model.
Explanation:The electron sea model is a representation of metallic bonding where valence electrons are free to move around, and hence are considered 'delocalized'. This forms a 'sea' of electrons that surrounds the positive metal ions. This model is the simplest metal bonding model, not the most complicated one. It is not characterized by the transfer or sharing of valence electrons (as with ionic or covalent bonding, respectively), but on the free movement of the electrons among a lattice of atomic cores. The delocalized electrons do serve as a kind of 'glue' that holds the metal atoms together, providing the electrical conductivity and malleability characteristic of metals. However, it's incorrect to say these electrons are attracted to specific nuclei - they are collectively interacting with many nuclei.
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The electron sea model describes metallic bonding as a delocalization of valence electrons among metal ions, without specifying attachment to individual atoms. It is the simplest metal bonding model, where the 'sea' of delocalized electrons acts as the glue holding the metal structure together.
Explanation:The electron sea model is a framework used to describe metallic bonding, where the key characteristics involve the delocalization of valence electrons among metal ions. According to this model, metallic bonding results not from the transfer of electrons, as in ionic bonding, nor solely from the sharing of electrons, as in covalent bonding, but rather from a pooling of electrons resulting in a sea of electrons that are delocalized and free to move around. These delocalized electrons are not attached to any specific atom but are instead shared among many atoms, providing the characteristic malleability and conductivity of metals.
Regarding the options provided, the descriptions that are accurate for the electron sea model are:
It is the simplest metal bonding model.Metallic bonding results from the delocalization, not the sharing or transfer, of valence electrons.The electrons are delocalized.The delocalized electrons serve as the 'glue' that keeps the metal atoms together.The statements that electrons are attracted to specific nuclei and that they serve as the glue to keep metal atoms together do not represent the electron sea model adequately, as the electrons are not tied to any particular metal ion.
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The functional group for a carboxylic acid is
Answer: -COOH
Explanation: In general, carboxylic acids are represented by the formula RCOOH, where R is a hydrocarbon group and COOH is the fuctional group.
-
-
The functional group for a carboxylic acid is -COOH.
What is a carboxylic acid?An organic acid containing a carboxyl group. The simplest examples are methanoic (or formic) acid and ethanoic (or acetic) acid.
Organic acids such as acetic acid all contain a functional group called a carboxyl group. The carboxyl group contains the C=O. of the carbonyl group, with the carbon atom also being bonded to a hydroxyl (−OH) group. The simplest carboxylic acid is acetic acid [tex](CH_3COOH)[/tex]
Hence, the functional group for a carboxylic acid is -COOH.
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Which of the following is a physical of a substance
A.Reactivity
B.Hardness
C.Flammability
D.Toxicity
A quality I would say of a physical substance is hardness
Hardness
it's something you can see and tell without changing the composition of matter
The planets closest to the Sun are the inner, or terrestrial, planets and are similar to Earth in some ways. They are rocky and dense, have few moons, no rings, and are relatively small. These planets also differ in many ways, as shown in the chart. For example, Venus is the hottest planet on the chart, even though Mercury is closer to the Sun. The temperature difference between Venus and Earth is significantly greater than the difference between Venus and Mercury, even though Venus lies close to midway between those two planets. Which statement elaborates on the cause of this wide range of temperatures between terrestrial planets? 45 POINTS!!!
A) The dense atmosphere of Venus traps the Sun's heat, known as the greenhouse effect, resulting in high temperatures.
B) The farther away from the Sun, the thinner a planet's atmosphere. Closer planets need more protection from the heat.
C) The temperature of Mars is so low because its atmosphere is mostly made of carbon dioxide, which does not trap heat well.
D) Venus is more than twice as large as Mercury, so it absorbs more of the Sun's heat, even though Mercury is closer to the Sun.
Answer:
B) The farther away from the Sun, the thinner a planet's atmosphere. Closer planets need more protection from the heat.
Explanation:
The planets closest to the Sun are the inner, or terrestrial, planets and are similar to Earth in some ways. They are rocky and dense, have few moons, no rings, and are relatively small. These planets also differ in many ways, as shown in the chart. For example, Venus is the hottest planet on the chart, even though Mercury is closer to the Sun. The temperature difference between Venus and Earth is significantly greater than the difference between Venus and Mercury, even though Venus lies close to midway between those two planets.
Answer:
[tex]\Huge \boxed{\mathrm{A}}[/tex]
Explanation:
The terrestrial planets are the planets closest to the Sun.
Venus is the hottest planet, the temperature on Venus is higher than the temperature on Mercury and Earth.
Venus has a thick dense atmosphere, composed of primarily carbon dioxide and clouds of sulfuric acid, that traps the Sun’s heat, resulting in high temperatures. The atmosphere of Venus is more denser than the atmosphere of Mercury and Earth.
Please help
Rubbing the balloons against the woolen fabric or your hair creates static electricity. This involves negatively charged particles (electrons) jumping to positively charged objects. When you rub the balloons against your hair or the fabric they become negatively charged, they have taken some of the electrons from the hair/fabric and left them positively charged.
What would be a result of this simple static electricity experiment?
A) Both your hair and the balloon would be negatively charged and static would cause them to separate.
B) Rubbing the balloons against the woolen fabric or your hair creates heat energy.
C) Your positively charged hair would be attracted to the negatively charged balloon and would rise up to meet the balloon.
D) Static electricity is the movement of the charged particles between the objects.
Explanation: I THINK THAT YOUR POSITIVELY CHARGED HAIR WOULD BE ATTRACTED TO THE NEGATIVELY CHARGED BALLOON AND WOULD RISE UP TO MEET BALLOON.
HOPE THIS HELPS....
Answer:
C) Your positively charged hair would be attracted to the negatively charged balloon and would rise up to meet the balloon.
Explanation:
Your positively charged hair would be attracted to the negatively charged balloon and would rise up to meet the balloon. This answer is explained in the prompt.
A solution contains 100 mg/mL of a drug, and the recommended dose is 50 mg/lb. once a day. How much solution would be needed for one dose to be administered to a 20 kg patient?
A. 2.2 L
B. 220 mL
C. 22 L
D. 22 mL
Answer:20 kg * 2.2 lb/kg * 50 mg/lb * 1mL/100mg = 22 mL
Explanation:
Answer:
The correct answer is option (D) 22mL
Explanation:
Solution:
Given:
liquid concentration = 100mg/mL
weight = 20kg
dosage = 50mg/lb
converting the dosage from mg/lb to mg/kg, we have
1kg = 2.2046lb
therefore, dosage = 50mg * 2.2046/kg = 110.23mg/kg
The required solution can be obtained using the formula below
Dose = weight in kg * dosage in mg/kg ---------------1
liquid dose = dose/liquid concentration----------------2
Substituting into equation 1, we have
Dose = 20kg * 110.23mg/kg = 2204.6mg
For liquid dose, substitute into equation 2
Liquid dose = 2204.6mg/100mg/mL
22. 046mL
Approximately 22mL
Therefore, 22mL is needed to be administered to the 20kg patient
Hydrogen bonds between adenine & thymine or guanine and cytosine form ______ _______ that join the two strands of the DNA double helix. What is the blank? (Hint: the third letter of the first word is an S & both words combined can only be 9 letters) Please help! I have no idea :(
Base pairs.
Four + Five = Nine
The third letter in base is S.
IT ADDS UP.
In DNA, hydrogen bonds form base pairs between adenine and thymine or guanine and cytosine, which stabilize the double helix structure.
Explanation:The hydrogen bonds between adenine (A) and thymine (T) or guanine (G) and cytosine (C) form base pairs that join the two strands of the DNA double helix. In DNA, adenine forms a base pair with thymine and guanine forms a base pair with cytosine. These base pairs are fundamental in the structure of the DNA double helix. The arrangement was suggested by Chargaff's Rules and is consistent with Watson and Crick's proposed model of DNA. Two hydrogen bonds form in an A-T base pair and three in a G-C base pair, maintaining the stability of the DNA structure.
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How is an organism related to a population?
A population is all the organisms of a single species in a given area
Answer:
Explanation:
A population is a group of organisms of the same type. A population is a group of members that belong to the same species.
Therefore, an organism is a part of a population.
Which of the following terms refers to the existence of large research organizations with researchers working collaboratively in labs throughout the world on a single project?
big science
turbo-charged
relativistic science
principal commitment
∑
I believe the answer is Big Science.
Gregor Mendel used pea plants that were heterozygous for each of two traits
Answer:
Explanation:
C
does cm² mean with the power of two?
yup it's correct because we multiply cm by cm twice
Yes, "cm²" does indeed represent square centimeters, and it indicates an area measurement in the metric system.
The "cm" stands for centimeters, which is a unit of length, and the "²" denotes the square, signifying the second power or exponent of the unit. In mathematical terms, when you square a unit of length (in this case, centimeters), you are calculating the area.
For example, if you have a square with sides each measuring 5 centimeters, the area would be expressed as:
5 cm [tex]\times[/tex] 5 cm = [tex]5^2 \, \text{cm}^2\)[/tex] = 25 [tex]cm^2[/tex]
This concept extends to any shape or object where you need to measure the surface or coverage in two dimensions. The square unit (²) implies the measurement is being squared, representing an area rather than a linear measurement.
Muscles convert chemical energy into
Muscles convert chemical energy into mechanical energy
Answer:
Mechanical
Explanation:
I did it.
Which is a postulate of the kinetic-molecular theory?
Answer:
Gas particles have a small volume relative to the spaces between them.
Explanation:
The study of chemicals and bonds is called chemistry. There are different types of elements and these are metals and nonmetals.
What is kinetic energy?The energy formed by the motion of particles is called kinetic energy.
According to the question, the postulates are as follows:-
The particles in a gas are in constant, random motion.The combined volume of the particles is negligible.The particles exert no forces on one anotherAny collisions between the particles are completely elastic.The average kinetic energy of the particles is proportional to the temperature in kelvins.For more information about kinetic energy, refer to the link:-
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how are half reactions combine to give overall redox reaction
Answer:
the oxidized substance will have electrons as products (i think)
Explanation:
The first step to balance any redox reaction is to separate the reaction into half-reactions. The substance being reduced will have electrons as reactants, and the oxidized substance will have electrons as products. (Usually all reactions are written as reduction reactions in half-reaction tables.
Half-reactions are used to form the overall redox reaction by first balancing them separately and then adding them together. This process, also known as the half-reaction method, provides a systematic way to balance and understand complex redox reactions.
Explanation:Half-reactions are combined to form the overall redox reaction by balancing them separately first, and then adding them together. The half-reaction method involves balancing the oxidation and reduction half-reactions separately and then combining them. The overall redox reaction is obtained through this process.
Let's take a simplified example:
Imagine a redox reaction with Fe²+ and Cr₂O7²-. The two half-reactions occurring here would be the oxidation of Fe²+ to Fe³+ (oxidation half-reaction), and the reduction of Cr₂O7²- to Cr³+ (reduction half-reaction).
These half-reactions are balanced separately, where we match the electron loss in the oxidation half-reaction with the electron gain in the reduction half-reaction. The balanced half-reactions are then added together to give the overall redox equation.
To summarize, the half-reaction method is a systematic approach that allows us to simplify and understand complex redox reactions by breaking them down into manageable pieces.
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solid phosphorus (P4) burns in excess oxygen gas to produce phosphorus oxide(P4O10)
1. if 63.01 g of phosphorus is used what mass of p4O10 is produced?
Answer: 141,95 g
Explanatin:M phosphorus = 124,9 g/moln= 63,01/ 124,9=0,5 (mol)P4 + 5O2 --> P4O101 : 5 : 10,5 -> 2,5 -> 0,5 (mol) M P4O10 = 283,9 g/molm P4O10 = n.M = 0,5 . 283,9= 141,95 ( g) i hope that this will help (cause i not really good at english but i quite good at chemical :}} )Energy is released from radioactive elements.
True or False
Yes, radioactive decay releases energy
help please
Isabella was standing directly below a power line, and her compass failed to give an accurate reading.
How could she explain why her compass was not working?
A
A compass works with a magnetic field, and the electric current running through the lines above it would interfere with the magnetic field.
B
The compass works because of an electric field, and the electric current running through the lines above would interfere with the electric field.
C
The compass works because of a gravitational field, and the magnetic current running through the lines above would interfere with the gravitational field.
D
A compass works because of a magnetic field, and the magnetic current running through the power lines above it would interfere with the magnetic field below it.
a compass works with magnetic field the answer is d
In this illustration, the rings around the Sun represent
A)
orbits.
B)
sun rays.
C)
radiation.
D)
dust particles.
Answer:
Ok so its not dust particles i have proof i choose it and it was wrong but i have been working and the answer is sun rays i looked at images online and i found the same image so its sun rays i hope this helps.
In this illustration, the rings around the Sun represent sun rays. Sunlight, or radiation from the Sun, is a bundle of electromagnetic waves that range from infrared (IR) to ultraviolet rays (UV)
What are sun rays?Crepuscular rays are produced when sunlight passes through gaps in clouds and continues into an environment that contains dust and/or haze. They are also known as sun rays and sunbeams.
Sunlight, specifically infrared, visible, and ultraviolet light, is a type of electromagnetic radiation emitted by the Sun.
On Earth, sunlight is reflected and filtered by the atmosphere, and when the Sun is above the horizon, it is seen as daytime.
Sunlight, or radiation from the Sun, is a bundle of electromagnetic waves that range from infrared (IR) to ultraviolet rays (UV). The electromagnetic spectrum naturally includes visible light, which lies between IR and UV.
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The natural source of acidity in rain water is _____.
carbonic acid
sulfuric acid
nitric acid
all of the above
Answer:
carbonic acid
Explanation:
Carbonic acid refers to the natural existent acid in our atmosphere which is produced when water reacts with water vapor and it makes rain naturally acid. As a result, rainwater is always acidic. On the other hand, acid rain occurs when precipitation contains a higher than normal acidity and a pH lower than 5.0.
Answer:
Carbonic acid
Explanation:
Hello,
In this case, due to the increasing concentration of carbon dioxide in the atmosphere, when it rains, the following chemical reaction occurs between water and carbon dioxide:
[tex]CO_2+H_2O\rightarrow H_2CO_3[/tex]
Whose product is known as carbonic acid and it is the natural source of acidity in acid rain.
Regards.
Consider the transmutation reaction shown
10/5 B + 1/0 n -> 7/3 Li + 4/2 He
Which statement best describes the reaction?
A) When boron-10 is struck by neutrons, it produces lithium-7 and an alpha particle.
B) When boron-10 gives off an alpha particle, it also forms a neutron and lithium-7.
C) When lithium-7 absorbs an alpha particle, it forms boron-10 and a neutron.
D) When lithium-7 gives off an alpha particle, it also forms a neutron and boron-10.
plZ help <3
Answer: A
When Boron-10 is struck by neutrons, it produces Lithium-7 and an alpha particle.
This is done to control the number of neutrons available to interact with Boron to control the overall reaction rate
Answer:
Option A
Explanation:
The reaction:
¹⁰B + ¹n → ⁷Li + ⁴He
Correspond to a boron neutron capture therapy, which is used for treating malignant tumors and extracutaneous melanomas.
In the reaction, the boron-10 captures the neutrons and undergoes nuclear fission to produce nuclei lithium-7 and alpha particles (nuclei ⁴He) than can kill the tumor cells.
Hence, the correct answer is option A) when boron-10 is struck by neutrons, it produces lithium-7 and an alpha particle.
I hope it helps you!
Which term names the main class of the chemical that makes up bread.
Answer:
yeast
Explanation:
I’ll give brainlyiest (sorry if I spelled it wrong) to first correct answer
Answer:
Dependent variable
Hope this helps :)
Have a great day !
5INGH
Brainliest please
Explanation:
PLEASE HELP ME ASAP PLEASE HELP ASAP!!! PLATO ILL GIVE YOU BRAINLIEST!!!
Describe what happens to a carbon-11 atom when it undergoes positron emission.
^^^^^^^
The decay of a carbon-11 atom (blank1), and this causes it to emit (blank2).
The decay of a carbon-11 atom decreases the number of protons and increases the number of neutrons and causes it to emit radiations.
An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
When an atom undergoes decay, the number of protons present in the nucleus are decreased and radiations are emitted.
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The decay of a carbon-11 atom undergoes beta-plus decay (β+ decay)and this causes it to emit emits a positron (β+) and a neutrino (v).
Step 1: Unstable Nucleus
A carbon-11 atom has an unstable nucleus because it contains an excess of protons compared to neutrons. This instability makes it prone to radioactive decay.
Step 2: Positron Emission
During positron emission, a process that stabilizes the nucleus, the following occurs:
Proton Transformation: A single proton within the carbon-11 nucleus undergoes a transformation.Positron Creation: A positron (β+), which is an antiparticle to an electron with the same mass but positive charge, is created.Neutrino Emission: To conserve momentum and angular momentum, an uncharged neutrino (v) is also emitted along with the positron.What is going to happen to the volume of a gas that is put under MORE pressure while keeping the temperature constant?
A)The volume will increase.B)The volume will decrease.C)The volume will fluctuate.D)The volume will remain constant.
The answer is -B
if temperature and pressure are constant, the number of particles is proportional to the volume. Another way to keep the pressure constant as the volume increases is to raise the average force that each particle exerts on the surface. This happens when the temperature is increased.
Answer:
B, The volume will decrease.
Explanation: