A 2M NaCl solution means 2N Nacl means 116.88 grams of Na.
What is solution?Solution is defined as mixture of two or more than two components or elements in a definite of fixed proportion. Solution cannot be identified by eyes. Once a solution is prepared it cannot be separated by physical method and for separation chemical method is required.
Each one pH increase is 10x less hydrogen ions and 10x more hydroxide ion, so a pH of 10 is 10^3 = 1000x less hydrogen atoms and 1000x more hydroxide ions than a pH of 7.
The negative logarithm of the hydrogen ion concentration, [H+], a measure of the degree to which a solution is acidic or alkaline. An acid is a substance that can give up a hydrogen ion (H+); a base is a substance that can accept H+.
Solution cannot be identified by eyes. Once a solution is prepared it cannot be separated by physical method and for separation chemical method is required.
Therefore, Solution cannot be identified by eyes. Once a solution is prepared it cannot be separated by physical method and for separation chemical method is required.A 2M NaCl solution means 2N Nacl means 116.88 grams of Na.
Learn more about solution here:
https://brainly.com/question/7932885
#SPJ2
Final answer:
A 2M NaCl solution means there are two moles of sodium chloride per liter of solution, which upon dissociation produces two moles of ions per mole of NaCl, leading to a higher effective concentration for colligative properties.
Explanation:
A 2M NaCl solution refers to a concentration of sodium chloride in which there are two moles of NaCl dissolved per liter of solution. When NaCl dissociates in water according to the reaction NaCl(s) → Na⁺ (aq) + Cl⁻ (aq), each mole of NaCl produces one mole of Na⁺ ions and one mole of Cl⁻ ions, resulting in a total of two moles of ions for each mole of NaCl. Therefore, a 1 M solution of NaCl has a net particle concentration of 2 M due to this dissociation effect, which is important for calculating properties like boiling point elevation or freezing point depression where the number of particles in the solution affects the outcome.
Which elements can form basic compounds? Check all that apply. sulfur rubidium arsenic selenium silicon xenon antimony
Final answer:
Among the elements listed, rubidium can form basic compounds like rubidium hydroxide, while silicon can react with strong bases to form silicates. The other elements mentioned are not typically known for forming basic compounds.
Explanation:
Elements that Can Form Basic Compounds
Among the elements listed, rubidium (Rb) is a metallic element that can form basic compounds known as oxides and hydroxides. For instance, rubidium hydroxide (RbOH) is a strong base. The element silicon (Si), while being a metalloid, can react with strong bases to form silicates, which are basic compounds. However, sulfur (S), arsenic (As), selenium (Se), antimony (Sb), and xenon (Xe) are typically not known for forming basic compounds. Arsenic, for instance, generally forms compounds with oxidation states of 3+ or 5+ and not typically basic in nature.
It is important to differentiate between basic compounds and acidic or amphoteric compounds as it affects the chemical reactions and properties of these elements. For chemistry students, understanding the properties and tendencies of elements to form certain types of compounds is essential in predicting chemical reactions and studying material characteristics.
The answers are:
B) Rubidium
C) Arsenic
E) Silicon
G) Antimony
All atoms of the same element contain the same number of
a. neutrons.
b. protons.
c. neutrons and electrons.
d. neutrons and protons.
Answer: The answer is B while neutrons and electrons are usually the same in a given atom protons are always consistent.
Why is information that has been peer edited more reliable than information that has
not?
Peer editors often check a writer's work for accuracy.
Peer editors charge money to publish information.
Peer editors make sure that spelling and grammar is correct.
Peer editors are more intelligent than writers.
Answer:
Peer editors often check a writer's work for accuracy.
Explanation:
A peer-reviewed report or scientific journal means the contents of the scientific journal or report have been scrutinized by other scientists and the results of any experiments/tests have been confirmed and corroborated for accuracy. Peer scientists replicate these experiments to check if they can get the same results indicated. Only then is the document positively reviewed and can be trusted for citations across the scientific community. Its a method of Quality Assurance in the scientific community.
Homo erectus is believed to be the first confirmed species found outside of ___
Answer:Homo erectus is believed to be the first confirmed species found outside of Africa.
Explanation:
Answer:
Homo erectus is believed to be the first confirmed species found outside Africa.
Explanation:
The human race is believed to have evolved in Africa because the evidences of evolution of major human species are found in Africa. The fossil evidences of Homo erectus were found in Georgia, China etc before millions of years. Evidences of all the human species that lived on earth before Homo erectus were found in the continent of Africa.
All the human species that lived before Homo erectus didn’t stand upright and move in two legs. It was only from the period of Homo erectus that humans stood upright and moved in two legs.
When does IPM use synthetic chemical pesticides?
Answer:
only as a last resort
Explanation:
The IPM or Integrated Pest Management only use synthetic chemical pesticides as a last resort. The IPM is a way to deal with the pests. It aims to decrease the population of the pests below normal level to avoid mass destruction of crops by pests and other insects.
Synthetic chemical pesticides are ruthless and efficient in doing their jobs but they also leave some damage behind. Most pesticides that use synthetic chemicals are harmful to the crops as well as for our bodies. Using them in large quantities is not recommended.
The blood pressure of a soldier is measured while he is resting. The soldier is then exposed to a stressful environment and his blood pressure is measured again
What’s the independent and dependent variable?
Answer:
Independent: stressful enviromentt
Dependent: blood pressure
Answer:
A variable, which is monitored or changed while performing an experiment in order to examine the influences on the dependent variable is considered as the independent variable. On the other hand, the variable, which is being determined and examined while performing an experiment is known as a dependent variable.
The dependent variable bank upon the independent variable. As the researcher modifies the independent variable, the influence on the dependent variable is witnessed and noted. In the given case, a soldier is exposed to a stressful environment, which makes a change in his blood pressure.
It is noted that with the change in the environmental condition, a change is noticed in the blood pressure of the soldier. Thus, in the given case, the stressful environment is an independent variable, and the change in blood pressure is a dependent variable.
Which type of alternative energy can produce ethanol? A. hydropower energy B. solar energy C. biomass energy D. wind energy
Answer:
C. biomass energy
Explanation:
Alcohol may be formed in the process of biochemical changes in the decay of live matter.
C. Biomass energy is the kind of alternative energy than can produce ethanol.
Explanation:The biomass energy is a renewable source of fuel that is produced from corn and other plants. Ethanol has very widespread uses. It is used as fuels for vehicles, in alcohol and beverages, etc.
Apart from corn, Ethanol is also produced from sugar corn, sugar beets, trees, grasses, agricultural residues, etc. The most common way to produce ethanol from biomass is by using the yeast to ferment sugar and starch found in corns, sugar beets, and sugar canes.
What is a benchmark meaning in earthquakes
Answer:a time period where its at a low
Explanation:its break time
Which molecule is incorrectly matched with its monomer?
a. nucleic acids; nucleotide
b. protein; amino acid
c. starch; lipid
Answer:
C. starch and lipid
Explanation:
Answer:
The answer to your question is c, starch; lipid.
Explanation:
a. nucleic acids; nucleotide This answer is not right because nucleic acids are composed by nucleotides then nucleotides are the monomers of nucleic acids.
b. protein; amino acid . This question is not right because proteins are composed by aminoacids that means that aminoacids are monomers of proteins.
c. starch; lipid. This question is right because starch is composed by monosaccharides so monosaccharides are monomers of starch not lipids.
what are thhe main differences between plant and animal cells
Answer:
A difference between plant cells and animal cells is that most animal cells are round whereas most plant cells are rectangular. Plant cells have a rigid cell wall that surrounds the cell membrane.
Explanation:
Question 2 (b) The membranes of both B cells and the cancer cells are largely composed of phospholipids. Explain how, when the membranes are fused, the polar parts of the phospholipids from one cell will interact with the phospholipids from the other cell and how the nonpolar parts of the phospholipids from one cell will interact with the phospholipids from the other cell.
The major component of cell membranes are lipids. They have two groups attached to them which are called “hydrophobic fatty acid tails” and “hydrophilic head”. B cells are called lymphocytic cells which provide immunity by secreting antibodies. Cancer cells are cells which continuously repeats itself to form a tumor structure.
When the polar parts interact hydrophobic tails are lined up with one and another. They form a membrane which diffuses creating a membrane of hydrophilic head on two sides facing water .Thus a brief explanation of how polar and the nonpolar parts combine are explained.
When cells fuse, hydrophobic phosphate groups of both cells interact with water; whereas hydrophobic fatty acid tails interact with one another in the interior of the bilayer.
The main component of the plasma membrane in all cells are monomers called phospholipids.A phospholipid is a lipid molecule composed of glycerol (the backbone of a phospholipid), two fatty acids, and a polar phosphate group head.The non-polar fatty acid chains are hydrophobic, while the negatively charged phosphate groups are hydrophilic.When forming membranes from monomers, phospholipid molecules of the membrane organize themselves as a bilayer.The polar phosphate groups tend to form hydrogen bonds with water and with other polar molecules on both the exterior and interior of the cell.The fatty acid chains of the phospholipids interact with each other, which help to stabilize the lipid bilayer structure and these interactions are responsible for the membrane's properties.In conclusion, when cells fuse, the polar phosphate groups interact with water on both the exterior and interior of the cell; whereas fatty acid tails interact with one another in the interior of the bilayer.
Learn more in:
https://brainly.com/question/5793606?referrer=searchResults
A person lives in a new structure that complies with modern building codes with regard to earthquake safety. What is the best place for this person to take cover during an earthquake
Answer:
The correct answer would be to move under a table.
Explanation:
The best manner by which a person can remain safe at the time of an earthquake as suggested by the experts is to drop, cover, and hold on. Thus, the best thing one can do at the time of an earthquake is to drop and cover under a table and hold on.
The deadly things, which can turn fatal at the time of an earthquake would be to stand in a doorway or near a window or covering in a basement.
a summary of the book tessa afshar
Answer:
Tessa was born in Iran and lived there for the first fourteen years of her life. She moved to England where she survived boarding school for girls and fell in love with Jane Austen and Charlotte Bronte, before moving to the United States permanently. Her conversion to Christianity in her twenties changed the course of her life forever.
Tessa holds an MDiv from Yale University where she served as cochair of the Evangelical Fellowship at the Divinity School. She serves on the staff of one of the oldest churches in America. But that has not cured her from being addicted to chocolate.
How do enzymes affect activation energy?
Answer:
Catalysts lower the activation energy for reactions. The lower the activation energy for a reaction, the faster the rate. Thus enzymes speed up reactions by lowering activation energy. Many enzymes change shape when substrates bind.
Explanation:
Enzymes affect activation energy by significantly lowering it. This reduction in activation energy increases the rate at which chemical reactions occur within cells. As a result, reactions that might occur too slowly or not at all because of high activation energies proceed rapidly in the presence of enzymes, facilitating the complex network of metabolic pathways necessary for life.
Activation energy is the minimum amount of energy required for reactants to transform into products in a chemical reaction. In biochemical processes, this energy barrier can prevent vital reactions from happening at efficient rates. Enzymes serve as biological catalysts that lower this barrier, making it easier for the reaction to occur without the need for excessive heat which is unattainable in living cells. These catalysts work by binding to reactant molecules, stabilizing the transition state, and thereby decreasing the necessary energy for the reaction. For instance, in cellular respiration, glucose is a key reactant transformed into energy. The production of glucose is through photosynthesis, which is an endothermic reaction because it requires energy input from sunlight. Proper nutrition and regular exercise are crucial for maintaining a healthy body as they ensure the availability of necessary substrates and optimized enzyme function for metabolic reactions.
Enzymes are able to increase the speed of a reaction because they accomplish which of these tasks
Answer: Activation Energy
Explanation:Enzymes are biological catalysts. Catalysts lower the activation energy for reactions. The lower the activation energy for a reaction, the faster the rate. Thus enzymes speed up reactions by lowering activation energy.
Answer:
They decrease the activation energy.
Explanation:
An atom of argon has three electron shells, all of
which are full. Its atomic mass is 40. How many
neutrons does it have?
a. 8
c. 20
e. 24
b. 16
d.22
Argon, with an atomic number of 18 and an atomic mass of 40, contains 22 neutrons. This is calculated by subtracting the number of protons (18) from the atomic mass (40).
Explanation:The atom in question here is Argon. To understand the number of neutrons it contains, we need some basic knowledge of atomic structure and atomic mass. An atom consists of protons, electrons, and neutrons. Argon has an atomic number of 18, which tells us it has 18 protons. Electrons do not contribute significantly to the atomic mass, hence, the atomic mass is basically the sum of protons and neutrons.
Knowing that Argon has an atomic mass of 40 and that it has 18 protons, we can calculate the number of neutrons. Subtract the number of protons from the atomic mass (40-18), yielding the number of neutrons. So, Argon has 22 neutrons.
Learn more about Atomic Structure here:https://brainly.com/question/7328982
#SPJ2
A good question to use for a scientific investigation should be testable, and it should be connected to science concepts. Casey wants to do a scientific investigation about light. Which of the following questions would be best to use to guide his scientific investigation?
A) What color of light is the prettiest?
B) Which type of light bulb is easiest to catch?
C) Which type of light bulb burns the longest?
D) Which type of light bulb is preferred by moms?
Answer: C
Explanation:
Study island
Answer:C) Which type of light bulb burns the longest?
Explanation:The prettiness of light bulb cannot be directly measured. The question "Which type of light bulb is preferred by moms?" and the question about catching light bulbs are not related to scientific concepts about light or light bulbs. The best scientific question is, "Which type of light bulb burns the longest?"
the cell membrane is a lipid bilayer, but a cell has only one cell membrane. which organelles in this lesson have a double membrane?
Answer:
The cell membrane is composed of two layers of phospholipids and is a fluid structure that's composed of four main molecules.DNA is transcribed into RNA within the nucleus and then RNA is transported to the cytoplasm.The lipid bilayer (or phospholipid bilayer) is a thin polar membrane made of two layers of lipid molecules. These membranes are flat sheets that form a continuous barrier around all cells. These membranes are flat sheets that form a continuous barrier around all cells.
Explanation:
The mitochondria and chloroplasts in plant cells, as well as the nucleus, are the organelles in a cell that possess a double membrane.
Explanation:The cell organelles that have a double membrane are the mitochondria and the chloroplasts in plant cells. These organelles are unique in that they have their own DNA separate from the rest of the cell, and this is protected within their double membrane structure. The nucleus, which houses the cell's main DNA, also has a double membrane. Hence, several organelles do indeed have a double membrane despite the cell itself having a single cell membrane, which is also known as a lipid bilayer.
Learn more about Double-Membrane Organelles here:https://brainly.com/question/33458669
#SPJ2
which of the following statements is true of babies born to HIV-infected mothers?
"Babies born to HIV-infected mothers can be infected but asymptomatic." This is true. Therefore, option (3) is correct.
Some babies born to HIV-positive moms will contract HIV. Medical care can lower the risk of mother-to-child HIV transmission. The illness can worsen in asymptomatic newborns. HIV is transmitted by body fluids, not fertilisation.
Breastfeeding can transmit HIV, however antiretroviral medication for mum and baby and alternate feeding practises can reduce the risk. Proper medical care and prevention help prevent HIV transmission from moms to their children. Therefore, option (3) is correct.
Learn more about HIV, here:
https://brainly.com/question/31765366
#SPJ4
Your question is incomplete but your full question was:
Which of the following statements is true of babies born to HIV-infected mothers?
Babies can contract HIV during sperm/egg adhesion in the fertilization process.All babies born to HIV-infected mothers are infected with HIV.Babies born to HIV-infected mothers can be infected but asymptomatic.Babies seldom contract HIV through breast feeding by an infected mother.Emily wanted to see what battery lasted the longest. She put each battery into a clock and recorded the time that the clock stopped. She used Duracell, Energizer, Kroger bran, and EverReady. What is the control variable and the contstants?
The control variable in Emily's experiment could be any unchanged factor like clock type, while the constants are conditions that remained the same for all batteries tested. The problems provided focus on calculating energy content, battery life, and evaluating a company's product claim in a real-world context.
Explanation:In Emily's experiment, the control variable could be any factors she kept constant, such as the type of clock used, the environment in which the clocks were kept (temperature, humidity, etc.), and the start time for each battery. The constants are all the conditions that were kept the same for each battery tested to ensure a fair comparison, like the brand and model of clock, as well as the conditions under which the experiment took place.
Looking at the supplied problems, they deal with calculating energy content and battery life which are essential concepts in Physics, particularly related to electric circuits and power consumption.
Problem 91 touches upon statistical analysis with a real-world application in evaluating a company's claim about their product. It involves using a calculator to determine the probability of a sample mean being at a certain value or lower, which is an interesting application of statistics in a Physics context.
Scientific method lab results
Answer:
1.Observation and description of a phenomenon. The observations are made visually or with the aid of scientific equipment.
2.Formulation of a hypothesis to explain the phenomenon in the form of a causal mechanism or a mathematical relation.
3.Test the hypothesis by analyzing the results of observations or by predicting and observing the existence of new phenomena that follow from the hypothesis. If experiments do not confirm the hypothesis, the hypothesis must be rejected or modified (Go back to Step 2).
4.Establish a theory based on repeated verification of the results.
Explanation:
The scientific method is a structured approach used in scientific research. It begins with an observation, then a hypothesis is formed, and experiments are conducted to test this hypothesis. Lab results reveal whether the hypothesis was correct, needs revision, or is incorrect.
Explanation:The scientific method is a systemic approach used in science to find answers to questions or solve problems. It consists of a sequence of steps, each of which plays an integral part in the research process.
The first step is to make observations about the world around us. With observations, we form a hypothesis, which is a tentative explanation for the observed phenomenon. This hypothesis becomes the basis for the experiment, where we test to see if it holds true.
The lab results are findings obtained from an experiment. They provide detailed information on whether the hypothesis stands or not. They may either support the hypothesis, totally debunk it, or partially prove it. Analyzing and interpreting these results is key in scientific research. For instance, if your hypothesis is 'All plants turn towards the sunlight,' you would study several plant species over a period of time to either support or refute this hypothesis based on the results. If some plant species consistently do not turn towards the sun, your lab results would falsify the hypothesis, leading to its revision.
Learn more about scientific method here:https://brainly.com/question/17636973
#SPJ6
Which is a term for a decomposer?
O
A. Detritivore
O
B. Carnivore
O
C. Herbivore
O
D.Omnivore
The term for a decomposer in the context of biological relationships is a Detritivore. These organisms break down organic material into simpler substances, which provides nutrients for plants.
Explanation:In the context of biological relationships, a decomposer is best referred to as a Detritivore. Detritivores are organisms like bacteria, fungi, earthworms, and certain types of insects that aid in the process of decomposition.
They digest organic material, breaking it down into simpler forms of matter. This ultimately enriches soil and provides nutrients for primary producers (plants). This is different from a Carnivore, which primarily eats meat; a Herbivore, which primarily eats plants; and an Omnivore, which eats both plants and meat.
Learn more about Decomposer here:https://brainly.com/question/28896356
#SPJ3
Prompt
What are scientific models used for? Give an example of each of the following types of models: Idea, Physical, Computer.
Answer:
Scientific models are used to predict and elaborate the behaviour of the real objects in the field of physics, chemistry, ecology and earth science.
It is used to gain improved understanding of the processes and systems.
Explanation:
However, every model have some limitations because they are not the representative of every possible scenario. For instance, relationship between time and distance is the idea model, study of cell and its various parts uses physical model, predicting earthquake uses computer model.
whiat is not classified as an organism.
A tree
B lizard
C apple
D bacteria
A. AppleAnswer:
Explanation:
Answer:
the answer is apple
Explanation:
i just took the test and got a 100 precent on it trust me
What is the role of a scientist?
_______________________
(Apex) Answer Choices:
A. To keep scientific secrets
B. To report accurate results
C. To tell people how they must live
D. To dictate government policies
Answer:
B.
Explanation:
The purpose of being a scientists is to share your discoveries with others. Discoveries which must be accurate.
To report accurate results is the role of a scientist. Thus, the correct option is B.
What is the role of scientist in society?Scientists play an important role not only in avoiding unprofessional and dangerous decisions, but also in advising policymakers and other stakeholders about the wiser and best moves to make towards a human-centered society, in such that fomenting scientific knowledge and expanding cross cultural connections and joint research.
Scientists create hypotheses, test them through various methods such as statistics and data and evaluate conclusions based on the evidence provided.
For more information regarding scientists, visit:
https://brainly.com/question/17216882
#SPJ2
After you decide what information to collect in a descriptive investigation, you need to _____.
Answer:
Make Observations is your answer
Explanation:
Mark brainiest please
Answer:
Make Observations
Explanation:
i hope you have a great day and have a wonderful weekend
a chemistry student’s height is measured at 68.5 inches. How tall is the student in cm
Answer:
173.99 CM
Explanation:
68.5 * 2.54 = 173.99
If a chemistry student’s height is measured at 68.5 inches, then he would have been 174 centimeters tall.
What is a unit of measurement?A unit of measurement is a specified magnitude of a quantity that is established and used as a standard for measuring other quantities of the same kind. It is determined by convention or regulation.
As given in the problem a chemistry student’s height is measured at 68.5 inches and we have to find out his height in centimeters.
As we know, from the standard measurements,
1 inch = 2.54 centimeters
68.5 inches = 68.5 ×2.54 centimeters
= 174 centimeters
Thus, he would have been 174 centimeters tall.
To learn more about the unit of measurement from here, refer to the link;
brainly.com/question/12629581
#SPJ2
which of these are limiting factors?
a- habitat loss b- all of the above
c- food availability
d- predators
e- disease and parasites
Answer:
all of the above
Explanation:
habitat loss, food availability, predators and disease are all limiting factors in terms of survival
Which temperature is colder, -187°C or -168°C?
In the comparison of temperatures, -187°C is colder than -168°C, as numerically lower temperatures on the Celsius scale represent colder conditions.
The question at hand is which temperature is colder, -187°C or -168°C. In terms of temperature measurement, a lower number indicates a colder temperature. Thus, directly comparing the numbers, -187°C is colder than -168°C because the value -187 is smaller (or lower) than -168 on the Celsius scale. Furthermore, the subject of temperature ties into the concept of the Kelvin scale, which is an absolute thermodynamic temperature scale with its zero point at absolute zero, the theoretical coldest possible temperature.
The “cause” for something to happen is the:
A. Effect
B. Feedback
C. Response
D. Stimulus
Answer:
d stimulus
Explanation:
The stimulus is what triggers an event, or its "cause". Therefore, option (D) is correct.
A stimulus is an internal or external force that causes an organism or system to respond or react. A physical event, an environmental change, or a particular input may start a series of events that result in an outcome or reaction.
In order to trigger a biological, physiological, or behavioural response in living things or a reaction in non-living systems, the stimulus serves as a catalyst. It acts as the catalyst for a chain of events that, depending on the situation, have the potential to produce an impact, feedback, or reaction.
Learn more about stimulus, here:
https://brainly.com/question/298785
#SPJ2