5. Describe the 3rd criterion, ‘Keep costs low’ and explain why it is important.

Answer:

Tetrahedral molecules are normally spy hybridized.

Explanation:

Answer:

1 biosphere 2 hydrosphere 3 geosphere 4 atmosphere

An element's electronegativity determines whether it is ionic or non-ionic. Fluorine has the most electronegativity while iodine has the lowest, which means that the Cs I ionic bond's power of attraction is at its lowest, allowing for the largest possible distance between their molecules.

The attracting and repellent forces that develop between the molecules of a substance are referred to as intermolecular forces (IMF), which is sometimes shortened. These forces act as a bridge between the individual molecules of a substance. Intermolecular forces are primarily responsible for the physical and chemical properties of matter.

The following are the four main intermolecular forces: Van der Waals dipole-dipole interactions < Van der Waals dispersion forces <Ionic bonds <Hydrogen bonds .

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Two types of data that can be obtained from descriptive statistics include frequency distribution and variability in the data set. These data are calculated as the mean of standard deviation in the case of variation.

The relative importance of the science field of descriptive statistics is based on the obtention of statistically significant measurements in order to validate a hypothesis.

Therefore, with this data, we can see that the relative importance of the science field of descriptive statistics is based on testing working hypotheses.

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Answer: Loamy, sandy and clayey

Answer:

Sand, silt and clay

Explanation:

Soil can be classified into three primary types based on its texture – sand, silt and clay. However, the percentage of these can vary, resulting in more compound types of soil such as loamy sand, sandy clay, silty clay, etc.

Source: https://byjus.com/biology/types-of-soil/#:~:text=Soil%20can%20be%20classified%20into,clay%2C%20silty%20clay%2C%20etc.

Hope this helps! :)

Happy Late Valentine's Day!

Brainliest, Please!

Answer:

They're all living things.

Explanation:

Bacteria - This is the controversial one. Because they do not use their own energy, some scientists do not consider them alive. This is a bit of an odd distinction though, because some bacteria rely on energy from their host, and yet they are considered alive. These types of bacteria are called obligate intracellular parasites. Living things respond to their environment. However, bacteria need food, they reproduce, and some need oxygen.

Answer:

1490 and it has 3 significant digits

Explanation:

Answer:

1.49x10^3

Explanation:

There are three significant figures and it is best expressed in scientific notation

The solution will be unsaturated at 20 degrees Celsius when  25 g of KCl will be added to 100 g of water.

Solubility can be described as the ability of a substance, the solute, to prepare a solution with another substance, the solvent. The extent of the solubility in a specific solvent is measured as the concentration of the solute in a saturated solution.

For few solutes and solvents, there is no such limit, in which case the two substances are known as "miscible in all proportions". The solute can be in any phase, while the solvent is generally solid or liquid.

Given the  25 g of KCl added to 100 g of water.

The solubility = 25g KCl/ 100g H₂O

But in the given table 34 g KCl /100g H₂O at 20 degrees Celcius.

Therefore, the given solution is unsaturated at 20 degrees Celcius.

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Answer:

An atom is composed of them

Explanation:

Answer:

Each element has a different amount of protons. Neutrons are responsible for combining with protons in the nucleus together to be held by the strong force. Too many neutrons in an atom will result in radioactive decay due to the neutrons' force overpowering the strong force. Electrons are the weirdest particles.

Explanation:

sorry if thats too much to read but i hope that helps :)

Oxygen-16: 8 protons, 8 neutrons, 8 electrons

Oxygen-18: 8 protons, 10 neutrons, 8 electrons

Using atomic and mass numbers, we can find information about the makeup of atoms.

Protons

Every element has a unique number of protons, and every atom of the same element will have the same number of protons. This means that both oxygen atoms must have the same number of protons. The number of protons in an element is equal to its atomic number. Since oxygen has an atomic number of 8, all oxygen atoms will have 8 protons. This means that oxygen-16 and oxygen-18 have 8 protons.

Neutrons

The number of neutrons an atom of a certain element can have varies. Atoms of the same element that have different numbers of neutrons are known as isotopes. The number of neutrons can be found through the mass number. The mass number is the number that follows the dash in the name of the isotope. This number is equal to the protons plus the neutrons. So, to find the number of neutrons in an oxygen atom, subtract 8 protons from the mass number. This means oxygen-16 has 8 neutrons and oxygen-18 has 10 neutrons.

Electrons

Remember that electrons are negatively charged, protons are positively charged, and neutrons have no charge. The number of electrons in an atom determines the charge of the atom. If the number of electrons equals the number of protons, then the charge of the atom will equal 0. If there are more electrons, then the atom will be negatively charged and vice versa. Since neither of the atoms has any indication of a nonzero charge, the number of electrons must equal the number of protons. So, both oxygen atoms have 8 electrons.

To calculate the moles of H+ and OH-, you need to know the concentration of the solution in terms of its pH or pOH value.

When you get the pH of the solution, you can use this formula to calculate the concentration of H+ ions: [H+] = 10^(-pH)

Also, if you know the pOH of the solution, you can use this formula to calculate the concentration of OH- ions: [OH-] = 10^(-pOH)

Having determined the concentration of H+ and OH- ions, the molarity formula can be used to calculate the number of moles of each ion as follows: moles = concentration (in mol/L) x volume (in L)

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Mass spectrometer M+1 peak is small and m/z unit to the right of the main molecular ion peak

Mass spectrometry is an analytical tool useful for measuring to mass to charge ratio and one or more molecule present in a sample and there measurement can often be used to calculate the exact molecular weight of the sample components as well and there is a technique

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A major purchase refers to a high-cost item or service that is considered a significant investment for an individual or household, such as a car, home, or college education. Major purchases usually involve a large sum of money and require careful planning and consideration before a final decision is made.

Any item that a person or a household buys for their own use or consumption is called a consumer good. Durable and non-durable goods are two types of consumer goods that can be classified. Consumer goods are tangible items that people or households buy for their own use or consumption.

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Your question is incomplete, most probably the complete question is:

The difference between Major purchase and Consumer good​?

The heat that is absorbed by the system is  1363 J. Option B

We know that in a chemical reaction that there could be the absorption or the evolution of heat. We say that there is the evolution of heat when heat has been lost from the system and there is the absorption of heat when heat has been gained by the system.

Number of moles of the barium hydroxide hydrate = 3.15 g/203 g/mol

= 0.015 moles

Number of moles of the ammonium thiocyanate = 1.52/76 g/mol

= 0.02 moles

If 1 mole of barium hydroxide hydrate reacts with 2 moles of  ammonium thiocyanate

0.015 moles of barium hydroxide hydrate reacts with 0.015 * 2 moles/1 mole

= 0.03 moles

Hence the limiting reactant is the ammonium thiocyanate.

Now the heat that is absorbed is;

H = mcdT

m = mass of the water

c = Heat capacity

dT = Temperature change

H = 100 * 4.20 * 3.1

H = 1363 J

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The stage that this most accurately describes while using the PCR is the initiation of DNA synthesis, also known as the denaturation stage.

In the denaturation stage of Polymerase Chain Reaction (PCR), the double-stranded DNA template is heated to a high temperature to separate the two complementary strands and create single-stranded DNA. The denaturation stage is the first step in the PCR cycle.

In this stage, the heat-stable DNA polymerase denatures the DNA and the primers anneal to the complementary single-stranded template. This marks the beginning of the extension stage, where the DNA polymerase synthesizes new complementary strands along the template DNA.

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The seventh shell contains 49 orbitals, making the total number of electrons in 49 orbitals 98.

characteristics of elements in group 7

At room temperature, each halogen exhibits the properties listed below: A light yellow gas is fluorine. A deadly green gas, chlorine is poisonous. The reddish-brown liquid bromine is poisonous.

Since the group number is 7, this means that the outer shell of halogen atoms contains seven electrons (energy level). These atoms gain a single electron in order to stabilize themselves and adopt the same structure as the nearby noble gas (rather than losing seven electrons which would take much more energy).

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Answer:

Over time, as generations of individuals with the trait continue to reproduce, the advantageous trait becomes increasingly common in a population, making the population different than an ancestral one.

Explanation:

have a nice day.

Answer:

Explanation:

j

As combustion always result into the formation of water, the other type of reactions that may result into formation of water are Acid-Base Neutralization Reactions and Hydrogen and Oxygen Reaction.

Acid-Base Neutralization Reactions:

A neutralisation reaction is a chemical process in which an acid and a base combine to produce salt and water as the end products.

H⁺ ions and OH⁻ ions combine to generate water during a neutralisation reaction. Acid-base neutralisation is the most common type of neutralisation reaction.

Example: Formation of Sodium Chloride (Common Salt):

HCl + NaOH → NaCl + H₂O

Hydrogen and Oxygen Reaction:

Water vapour is created when hydrogen gas (H₂) and oxygen gas (O₂) are combined directly. This reaction produces a lot of heat and releases a lot of energy.

Example: 2 H₂ + O₂ → 2 H₂O

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Step 1 - Understanding stoichiometry

What we call stoichiometry in Chemistry is nothing but the proportion between reactants and products. This proportion can only be properly obtained when the reaction is balanced, as it naturally arises from the conservation of mass.

Therefore, when we are looking for the stoichiometry of the reaction, we have to look at those big numbers that come before the formula of each substance. Let's see an example:

In the reaction above, the stoichiometry, i.e., the proportion between reactants and products is 2 H2 : 1 O2 : 2 H2O, or simply 2:1:2.

Therefore, the information that describes the stoichiometry is always the balanced equation.

Step 2 - Understanding reaction scale

When we refer to reaction scale we mean how much reactant we have used. We can do a small scale reaction, or we can do great scale reactions (an explosion, for example).

The more reactant we use, the greater the scale of the reaction. Therefore, the information that correctly describes the scale of the reaction is the number of moles used as reactants in the experiment.

The type of energy transfer between the frozen ice cream and the tongue is convection. The frozen ice cream will gradually melt because of the temperature difference.

Convection is the method of heat transfer that involves the transmission of heat in a fluid (liquid or gas) by the circulation of currents.

According to this question, a spoonful of frozen ice cream is placed on the tongue. The heat transfer will occur between the tongue with warmer temperature and the ice cream with colder temperature.

The heat energy will flow from the tongue to the ice cream, hence, making it defreeze or melt with time. This type of heat transfer is convection because it involves a fluid.

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Answer: The burning of fossil fuels releases carbon dioxide, methane and other greenhouse gases into the atmosphere. These gases trap heat in the atmosphere, leading to a gradual increase in global average temperatures, known as global warming. This phenomenon has serious impacts on our environment and ecosystems, including extreme weather events and rising sea levels.

Answer:

28645 years

Explanation:

Given the formula;

0.693/t1/2 = 2.303/t log (No/N)

Given that N = 1/32 No

Note;

t1/2 = half life of Carbon-14

t = time required for N amount of carbon -14 to remain= 5,730 years

No= amount of carbon 14 initially present

N = amount of carbon-14 after time t

Substituting values;

0.693/5,730 = 2.303/t log (No/1/32No)

0.693/5,730 = 2.303/t log 32

1.21 * 10^-4      = 3.466/t

t = 3.466/1.21 * 10^-4

t = 28645 years

Any preserved imprints, remains and traces of once a living organism from history are called fossils. By utilizing the radioactive property of organic compounds one can determine the age of an object.

The approximate age of the fossilizes remain is 28645 years.

This can be estimated as:

The formula used will be:

\(\dfrac{0.693}{\dfrac{t1}{2}}= \dfrac{2.303}{t} log (\dfrac{No}{N})\)

Where,

Given,

N = \({\dfrac{1}{32} No\)

Replacing values in formula:

\(\dfrac{0.693}{5,730} & = \dfrac{2.30}{t} log \:({{\dfrac{No}{\dfrac{1}{32} No}})\)

\(\dfrac{0.693}{5,730} & = \dfrac{2.30}{t} \;log 32\)

\(1.21 \times 10^{-4} = \dfrac{3.466}{t}\)

\(t = \dfrac{3.466}{1.21} \times 10^{-4}\)

\(t = 28645 \:\text{years}\)

Therefore, the approximate age of the fossil is 28645 years.

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Answer:

Collecting data

Explanation:

Scientific inquiry can be explained as methods undertook by scientists to profer solutions, explanations, predict natural occurence and to some extent solve some of the problems of the earth through scientific study and processes. Evidence of solutions is made available to be built upon by also other scientists in the near future.

process of scientific inquiry include, in no particular order:

Note, that the explanation below doesn't follow any order.

1. Formulating questions: This is the problem that needed to be solved. Scientific inquiries usually begin with a question that can be proven scientifically.

2. Observation: taking neccessary information for the experiment.  Collecting data (answer to the question) falls under this process as information collected are used to carry out the experiment.

3. Hypothesis: Based on the observation and test carried out, scientists provide answers to the experiment, however methods used remain open for further experiments by other scientists. This is done so the results are tested and proven before they can be generally accepted as a rule or law.

4. Experiment: the experiment is carried out here.

5. Data analysis: Here the data collected are analysed using scientific methods.

6. Results: This stage shows the other aforementioned stages took place. Results of the scientific research/experiment are published.

Answer:collecting data

Explanation:i did it on study island

The pOH of the 0.001 M NaOH solution is approximately 3.

To determine the pOH of a solution, we need to know the concentration of hydroxide ions (OH-) in the solution.

In the case of a 0.001 M NaOH solution, we can assume that all of the NaOH dissociates completely in water to form Na+ and OH- ions. Therefore, the concentration of hydroxide ions in the solution is also 0.001 M.

The pOH is calculated using the equation:

pOH = -log[OH-]

Substituting the concentration of hydroxide ions, we have:

pOH = -log(0.001)

Using a calculator, we can evaluate the logarithm:

pOH ≈ 3

Therefore, the pOH of the 0.001 M NaOH solution is approximately 3.

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Answer:

My answer is d. hope this'll help

Answer:

It getting darker

Explanation:

This is because the light isn't hitting the earth as much, making it darker. They might also see more city lights than before. Hope this helps! plz mark as brainliest!

The number of moles of carbondioxide that can fill the sealed container is 0.261moles.

The number of moles of an ideal gas can be calculated using the ideal gas law equation as follows:

PV = nRT

Where;

According to this question, a sealed container can hold 6.28L carbondioxide at 1.00 atm and 293 K. The number of moles of the gas can be calculated as follows:

1 × 6.28 = n × 0.0821 × 293

6.28 = 24.0553n

n = 6.28 ÷ 24.0553

n = 0.261moles

Therefore, 0.261moles is the number of moles of the gas that can fill the container.

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\(\huge\mathsf{\red{\underline{\underline{Answer}}}}\)

\({\green{\dashrightarrow}}\)When you mix the rubbing alcohol with water, the latter's molecules make hydrogen bonds with the water molecules. The alcohol dissolves in the water to form a homogenous solution, so you cannot distinguish the alcohol and the water anymore.