average speed is ___.
a) a vector
b) the distance traveled divided by the time to travel that distance
c) measured in m/s
d) the slope of a velocity vs. time graph

Answer:

Explanation:

C

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.

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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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.

The energy formed by the motion of particles is called kinetic energy.

According to the question, the postulates are as follows:-

For more information about kinetic energy, refer to the link:-

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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.

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

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.

Answer:

Option B

Explanation:

We know that if the temperature of a gas increaseas, then the kinetic energy and the average speed increases too. For that reason, the correct answer is option B).

Answer: The correct answer is Option B.

Explanation:

Average kinetic energy is defined as the average of the kinetic energies of all the particles present in a system. It is determined by the equation:

[tex]K=\frac{3RT}{2N_A}[/tex]

where,

K = Average kinetic energy

R = Gas constant

T = Temperature of the system

[tex]N_A[/tex] = Avogadro's number

From the above relation, it is visible that kinetic energy is directly related to the temperature of the system. So, if average kinetic energy of the system increases, it means that temperature also increases and vice-versa.

Hence, the correct answer is Option B.

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

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 compass works with magnetic field the answer is d

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.

The first model of the atom was developed by JJ Thomson in 1904, who thought that atoms were composed purely of negatively charged electrons. This model was known as the 'plum pudding' model

Final answer:

Scientific theories and models change over time due to new evidence and experimentation, leading to more accurate predictions and descriptions of natural phenomena. The dynamic nature of science, such as in phylogenetic modeling in biology, necessitates continual revision and refinement of theories. This iterative process propels scientific discovery and understanding.

Explanation:

Why Theories and Models Change Over Time

The development of scientific theories and models is an iterative process, continually influenced by new data and experiments. As scientists observe nature more meticulously, they gather evidence that may either corroborate or challenge existing theories. The predictive ability of models plays a crucial role in their validity; precise models enable accurate descriptions and predictions about natural phenomena. For instance, Albert Einstein's general theory of relativity radically improved our understanding of gravity, leading to predictions and the eventual discovery of black holes.

In fields like biology, the concepts of phylogenetic modeling have undergone significant change. Scientists propose new models as new research provides insights into the relationships between organisms, showcasing the dynamic nature of scientific study. Ultimately, a theory must withstand rigorous testing, and when new evidence warrants, theories are refined or replaced to incorporate this newfound understanding.

The pathway from data to scientific discovery is often directed by the models, theories, and laws that scientists construct. These not only assist in analyzing collected data, but also guide researchers to novel discoveries, furthering the cycle of scientific progress.

Answer: 141,95 g

Answer:

Sulfur belongs to the chalcogen family. Other members of the family are oxygen, selenium, tellurium, and polonium. These elements make up Group 16 (VIA) of the periodic table. The periodic table is a chart that shows how chemical elements are related to each other.

The term chalcogen comes from two Greek words meaning "ore forming." An ore is a naturally occurring mineral used as a source for an element. Many ores are compounds of a metal and oxygen or a metal and sulfur. Compounds that contain two elements, one of which is sulfur, are called sulfides. For example, a beautiful gold-colored mineral is called pyrite, or "fool's gold," because it looks so much like real gold. Pyrite is iron sulfide (FeS 2 ).

Sulfur was known to ancient peoples. Its physical and chemical properties are very distinctive. It often occurs as a brilliant yellow powder. When it burns, it produces a clear blue flame and a very strong odor.

SYMBOL

S

ATOMIC NUMBER

16

ATOMIC MASS

32.064

FAMILY

Group 16 (VIA)

Chalcogen

PRONUNCIATION

SUL-fur

Sulfur, also spelled as sulphur, is a very important element in today's world. Its most important use is in the manufacture of sulfuric acid (H 2 SO 4 ). There is more sulfuric acid made than any other chemical in the world. It has an enormous number of important uses.

Discovery and naming

Sulfur must have been well known to ancient peoples. They sometimes referred to it as brimstone. Sulfur sometimes occurs in bright yellow layers on the top of the earth. It has a sharp, offensive odor. When it burns, it gives off a strong, suffocating smell. The odor is like that produced when a match is struck.

The Bible mentions brimstone in a number of places. For example, Sodom and Gomorrah were two towns destroyed by God for the wicked ways of their citizens: "The Lord rained upon Sodom and upon Gomorrah brimstone and fire."

But ancient people certainly did not think about sulfur the way modern chemists do. In fact, they used the word "element" to talk about anything that was basic. Ancient Greek philosophers, for example, thought that everything consisted of four elements: earth, fire, water, and air. Other philosophers thought there were only two elements: sulfur and mercury.

But early thinkers were often confused as to what they meant by the word "sulfur." They often were talking about anything that burned and gave off large amounts of smoke. To them, "sulfur" was really a "burning substance." It took centuries for scientists to identify sulfur as an element.

Explanation:

The most chemically similar element like sulfur is oxygen.

Oxygen is the most similar element to sulfur.

Let's see the similarity between oxygen and sulfur:

Sulfur - 0.88

Oxygen - 0.48

Sulfur -  1.84

Oxygen - 1.40

Sulfur (2.5) is less electronegative than oxygen, (3.4)

Thus, oxygen is most similar to sulfur.

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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.

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.

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:

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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Answer:

Dependent variable

Hope this helps :)

Have a great day !

5INGH

Brainliest please

Explanation:

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.

I believe the answer is Big Science.

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.

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.

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.

it is a double replacement

Answer:

Double Replacement

Explanation:

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:

Muscles convert chemical energy into mechanical energy

Answer:

Mechanical

Explanation:

I did it.

Yes, radioactive decay releases energy

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!    

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:

Answer:

Elements in group 15 will gain electrons and it will gain 3 electrons to obtain a noble gas structure.

Explanation:

A noble gas structure is obtained when it completes a full octet around the atom. Meaning it has 8 electrons in its outer shell.

Group 15 is also known as Group 5A or the Nitrogen group. The nitrogen group have 5 valence electrons. Now something to remember about gaining and losing electrons. When the outershell is more than half full, it is more likely to attract electrons to itself. When the outershell is less than half full, it is more likely to lose electrons.

So in the case of group 15, which has 5, it is closer to 8, so it will gain an electron. To complete the octet, it will need 3 more electrons.

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

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.

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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