Actually, the uncertainty point is when we have to estimate one place smaller than what the graduated cylinder can accurately read. So in this case, the smallest that we can accurately read is given by the minor marks of 0.2 mL. So if it is in between two minor marks we can only estimate the number, therefore the uncertainty is +/- 0.1ml.
Answer:
The estimated uncertainty is ±0.1 ml
Explanation:
Measurements are usually associated with uncertainty which depends on the instrument used or the procedure employed.
It is given that the graduated cylinder of volume 25 ml has a major scale marked every 2 ml and minor scale with 0.2 ml. In general measurements made with graduated cylinders can be estimated one decimal place beyond the smallest division. In this case, the volume of the liquid can be read to the nearest 0.1 division. Hence, the uncertainty would be ± 0.1 ml.
How much energy is required to heat 32.5 g of water from 34°C to 75°C
A substance that decreases h+ and increases ph when it dissociates in water is called
A substance that decreases hydrogen ion concentration and increases pH when dissolved in water is known as a base, which can provide hydroxide ions to combine with hydrogen ions, increasing the pH.
Explanation:A substance that decreases H+ concentration and increases pH when it dissociates in water is called a base. Bases can be substances that provide hydroxide ions (OH-) or other negatively charged ions that readily combine with hydrogen ions, which leads to a decrease in the aqueous hydronium concentration and as a result, increases the pH of the solution. This process often involves hydroxide ions binding to free hydrogen ions, forming new water molecules, and thereby raising the pH.
Mathematically, pH is expressed as pH = -log10 [H+], where a high concentration of hydrogen ions yields a low pH number, and conversely, a low concentration of hydrogen ions results in a high pH. The concept of pH is central to understanding acid-base chemistry and the behavior of substances in solution.
You have been given a mixture of water and a unknown solid substance. Your teacher asks you to perform a heating process to determine what the unknown substance is. When the temperature reaches 100 °C, the water begins to boil and you are left with a white crystalline substance. When your thermometer reaches 200 °C, everything in the container becomes a liquid. What is the unknown substance?
A) lead
B) aluminum
C) table salt
D) table sugar
Answer:
Table Sugar
Explanation:
The unknown substance must be table sugar.. At 200 °C, the only substances that would have melted would be water and table sugar. Everything else has a higher melting point, thus they would still be solid.
Consider the reaction of magnesium metal with hydrochloric acid to produce magnesium chloride and hydrogen gas. if 3.38 mol of magnesium and 3.38 mol of hydrochloric acid are reacted, how many grams of magnesium chloride are produced?
Answer: The mass of magnesium chloride produced in the given reaction is 16.09 grams.
Explanation:
We are given:
Moles of magnesium = 3.38 mol
Moles of hydrochloric acid = 3.38 mol
The chemical equation for the reaction of magnesium and hydrochloric acid follows:
[tex]Mg+2HCl\rightarrow MgCl_2+H_2[/tex]
By Stoichiometry of the reaction:
2 moles of hydrochloric acid reacts with 1 mole of magnesium.
So, 3.38 moles of hydrochloric acid will react with = [tex]\frac{1}{2}\times 3.38=1.69mol[/tex] of magnesium.
As, given amount of magnesium is more than the required amount. So, it is considered as an excess reagent.
Thus, hydrochloric acid is considered as a limiting reagent because it limits the formation of product.
By Stoichiometry of the reaction:
2 moles of hydrochloric acid is producing 1 mole of magnesium chloride.
So, 3.38 moles of hydrochloric acid will react with = [tex]\frac{1}{2}\times 3.38=0.169moles[/tex] of magnesium chloride.
Now, calculating the mass of magnesium chloride by using equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
Molar mass of magnesium chloride = 95.21 g/mol
Moles of magnesium chloride = 0.169 moles
Putting values in above equation, we get:
[tex]0.169mol=\frac{\text{Mass of magnesium chloride}}{95.21g/mol}\\\\\text{Mass of magnesium chloride}=16.09g[/tex]
Hence, the mass of magnesium chloride produced in the given reaction is 16.09 grams.
The density of Jell-O® is 1.56 g/cm3. A suite in a dorm can hold 6.35 × 107 g of Jell-O®. What is the volume of the suite in ft3? [2.54 cm = 1 in, 12 in = 1 ft]
This is a model of a Chlorine atom. How likely is it that this atom would want to bond with another atom?
This atom is very likely to bond with another atom.
k12 student, hope i helped! good luck
If a sample of ammonium nitrate yields 0.50 mol h2o, how many moles of n2o are formed
How much heat is needed to raise the temperature of 5.58 kilograms of iron from 20.0 Celsius to 1000.0 Celsius? Specific heat of iron is 450,000 J/(kgx Celsius).
Type the correct answer to 3 significant digits. If the answer has an exponent, type the number, then ^, then the exponent.
The release of _____ causes the bubbles in fermented beverages and the rising of bread.
Answer:
The given blank can be filled with carbon dioxide.
Explanation:
Carbon dioxide one of the by-products of fermentation is used in the production of carbonated beverages and in manufacturing of bread. In the brewing industry, alcoholic fermentation takes place in which transformation of sugar is done into ethyl alcohol and carbon dioxide. The carbon dioxide, which is the by-product in the process bubbles through the liquid and disperses into the air. The same phenomenon of carbon dioxide is used to cause rising of the bread.
Brianna wanted to compare the densities of two different solids of the same size 6cm3 (same volume) to see which one was more dense. Solid A had a mass of 2 grams and Solid B had a mass of 0.5 grams. (Density = Mass/volume)
this has to be done in CER form
Answer:
Density of Solid A is greater than B
Explanation:
Given:
Mass of Solid A = 2 g
Mass of solid B = 0.5 g
Volume of both solids = 6 cm3
To determine:
Densities of A and B
Calculation:
Density of a substance is the mass occupied by it in unit volume
[tex]Density = \frac{Mass}{Volume}[/tex]
For Solid A:
[tex]Density = \frac{2\ g}{6\ cm3} =0.33\ g/cm3[/tex]
For Solid B :
[tex]Density = \frac{0.5\ g}{6\ cm3} =0.083\ g/cm3[/tex]
Therefore solid A is more dense than solid B
What mass of agcl is produced by mixing 25.0 ml of 1.00 m agno3 with 25.0 ml of 1.00 m nacl?
All of the elements in a family or group have similar chemical properties. Which of the following statements best explains why this is true?
A. The elements in a group have the same number of protons in their nuclei.
B. The elements in a group have similar atomic mass numbers.
C. The elements in a group have the same number of valence electrons.
D. The elements in a group have similar atomic numbers.
Use the periodic table entry below to answer the following question.
How many protons does the element cobalt (Co) have?
27
32
58.93
59
The answer is A (27)
During the process of _____, gas loses heat and changes into a liquid.
Why are metals good conductors of electrical current?
A. Electrons can flow freely in metals.
B. Electrons can be permanently transferred from one metal atom to another.
C. Electrons stay in fixed positions in metals.
D. Electrons are often shared between two metal atoms.
Periodic table is divided into three metals, non metals and metalloids. The metals are kept on the left side of the periodic table. The correct option is option A.
What are non metals?Metals are the element that have property to loose electron. The examples of non metals are sodium, potassium, Aluminum, copper etc.
The properties of metals are:
Metals are not soft.
Metals are malleable that is they can be broken into thin sheets.
Metals are ductile they can be broken into thin wires.
Metals are not brittle in nature that is they can not be broken down easily.
Metals are lustrous.
Metals conduct electricity as electrons can flow freely in metals.
Therefore, metals are good conductors of electrical current as Electrons can flow freely in metals. The correct option is option A.
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If you heat a piece of iron from 50C to 250C. What happens to the particles' energy of random motion?
Write the complete balanced equation for the reaction that occurs when calcium carbonate (CaCO3) reacts with lithium nitride (Li3N) in an aqueous solution.
Answer: [tex]3CaCO_3(aq)+2Li_3N(aq)\rightarrow Ca_3N_2+3Li_2CO_3[/tex]
Explanation: According to the law of conservation of mass, mass can neither be created nor be destroyed.
The mass of products must be same as that of the mass of reactants. For this the number of atoms of each element must be same on both sides of the arrow. Thus we need to balance the chemical equations.
[tex]3CaCO_3(aq)+2Li_3N(aq)\rightarrow Ca_3N_2+3Li_2CO_3[/tex]
If 2 grams of element X combines with 4 g of element y to form a compound XY, How many grams of element y would combine with 35 g of X to form the same compound
What term describes a substance that is made when two or more different atoms bond together in a certain ratio?
Answer:
compond
Explanation:
The diagram illustrates the steps in a process that occurs in the cells of many organisms. Based on the diagram, the process of glycolysis most likely
a)begins the breakdown of glucose
b)produces oxygen for organisms to use
c)stores energy in molecules of water and carbon dioxide
d)recycles glucose within the cells of simple organisms
Answer:
A
Explanation:
Glycolysis is the first set of reactions in the breakdown of glucose.
During glycolysis, there are many enzymes and reactions that take place, in order to produce 2 molecules of ATP, and pyruvate.
Pyruvate then goes on to be part of another set of reactions which release more energy.
Glycolysis is the reaction that takes place in our bodies, and we do not produce our own oxygen, and hence option B is incorrect.
Option C is considered incorrect because although water and carbon dioxide are formed as products, glycolysis does not store energy in those molecules.
Option D is also wrong, because glycolysis does not recycle glucose, it breaks it down to release energy.
Which of these best describes a scientific law..? 1. A rule made by a government 2. A rule that does not depend on observable evidence 3. A statement which varies under the same conditions 4. A statement about how things act in the natraul world
A scientific law is a concise statement describing how the things act in natural world. The scientific laws are universal and and not falsifiable up to greater extend. Hence, option 4 is correct.
What are scientific laws?Scientific laws are scientific statements that describes a natural phenomenon or how nature works under a set of conditions. Unlike theories scientific laws are very concise and clear cut statement without more explanations.
Scientific laws are universal and must be in a harmony in between other laws. They can be proved by scientific experiments but cannot be falsifiable up to an extend.
A scientific law can be represented by a simple mathematical expression or a sentence. They clearly states how things act on the natural world. They are should be forwarded by observable evidence and scientific experiments. Hence, option 4 is correct.
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What is the differentences between atomic number and atomic mass?
Atomic number represents the number of protons, while atomic mass represents the weighted average of the masses of an element's naturally occurring isotopes.
The recognized standard means of inquiry used by research scientists is the method
5. Mr. Martin's Spanish class is 45 minutes long. If it starts at 3:30, what time does it end?
How does the state of atoms in a neon light change when light is emitted?
When light is emitted, atoms in a neon light loose energy according to the concept of emission spectrum.
What is emission spectrum?Emission spectrum is defined as a spectrum of a chemical compound or substance composed of frequencies of electromagnetic radiation. Radiations which are emitted while electron make transition from higher to lower energy level.
Energy of photon is equal to the difference between the two energy states . There are many possible electronic transitions in an atom and every transition has a specific wavelength.
Collection of different transitions with respect to different wavelengths makes up an emission spectrum.Emission spectrum of each element is unique and therefore spectroscopy is used to identify elements which are present in different substances.
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if a liter of water is heated from 20c to 50c, what happens to its volume?
Final answer:
When water is heated, its volume increases. For every 1°C increase in temperature, the volume of water increases by about 0.00021 liters. Therefore, when a liter of water is heated from 20°C to 50°C, its volume will increase by approximately 6.3 milliliters.
Explanation:
When water is heated, it expands and its volume increases. This is because the molecules in the water gain energy and start moving faster, causing the spaces between them to increase.
In this case, when a liter of water is heated from 20°C to 50°C, its volume will increase. The exact amount of increase in volume can be calculated using the coefficient of thermal expansion of water, which is approximately 0.00021 per degree Celsius.
This means that for every 1°C increase in temperature, the volume of water will increase by about 0.00021 liters. So, for a 30°C increase in temperature (from 20°C to 50°C), the volume of water will increase by 0.00021 * 30 = 0.0063 liters, or approximately 6.3 milliliters.
A mother calls you to ask about a proper dosage of cough medicine for her 2-year-old. The bottle says to administer 5.0mg/kg three times a day for children under 3 years of age. The cough syrup is supplied in a liquid that contains 50.0mg/mL.
Final answer:
To calculate the proper dosage of cough medicine for a 2-year-old child, you need to know their weight. The dosage is 5.0 mg/kg, so you can calculate the dosage by multiplying the weight of the child in kilograms by 5.0 mg. The cough syrup is supplied in a liquid that contains 50.0 mg/mL, so you need to convert the dosage into milliliters.
Explanation:
To calculate the proper dosage of cough medicine for the 2-year-old child, you need to know the weight of the child. Let's assume the child weighs 10 kilograms. The dosage is 5.0 mg/kg, so for a 10-kilogram child, the proper dosage would be 50.0 mg per dose. However, the cough syrup is supplied in a liquid that contains 50.0 mg/mL, so you need to convert the dosage into milliliters.
Since the syrup has a concentration of 50.0 mg/mL, you would need 1 milliliter of syrup to achieve a dosage of 50.0 mg. Therefore, the proper dosage of cough medicine for the 2-year-old child would be 1 milliliter of syrup per dose, three times a day.
When magnesium (mg) metal is placed in hydrochloric acid (hcl), it forms magnesium chloride (mgcl2) and a gas. what gas is formed in this reaction?
A mathematical equation is an example of: A scientific theory A scientific law A model More than one of these
A mathematical equation is typically an example of a scientific law, representing a concise description of a relationship in nature supported by scientific evidence and experiments. It can also serve as a model, but it is not usually an example of a scientific theory. So the correct option is the second option.
Explanation:A mathematical equation in the context of science is often a way of expressing a scientific law. This is because scientific laws are frequently described using mathematical formulas that stipulate a consistent relationship between variables, which is expected to hold true universally. For example, Newton's second law of motion which is framed as F = ma where F stands for force, m for mass, and a for acceleration, succinctly describes the relationship between these three quantities. Unlike scientific theories, which are more complex and typically cannot be condensed into a single equation, a law is more concise and is often supported by repeated experiments and observations.
Therefore, a mathematical equation is an example of a scientific law. It is a model of sorts, as it can be used to predict and understand real-world phenomena based on the relationships it describes. Importantly, while theories provide a broader and more detailed explanation of natural phenomena and are the end result of the scientific method, laws describe more specific actions or relationships.
In summary, while a mathematical equation can be part of scientific laws and models, it is not typically an example of a scientific theory.
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You have a pure (24-karat) gold ring with mass 10.8 g. gold has an atomic mass of 197 g/mol and an atomic number of 79. part a how many protons are in the ring
Final answer:
To find the number of protons in a 10.8 g gold ring, calculate the number of gold atoms using the molar mass, then multiply that number by the atomic number of gold, which is 79.
Explanation:
The student is asking about the number of protons in a gold ring. Since gold has an atomic number of 79, every atom of gold contains 79 protons. To find the total number of protons in the ring, we need to calculate the number of gold atoms present in 10.8 grams of gold and then multiply that number by 79.
The molar mass of gold is 197 g/mol, which tells us one mole of gold atoms weighs 197 grams. The number of atoms in one mole, known as Avogadro's number, is 6.022 x 10^23. So, the calculation goes as follows:
Determine the moles of gold in the ring: Moles of gold = mass of gold / molar mass of gold = 10.8 g / 197 g/mol.Calculate the number of gold atoms: Number of atoms = moles of gold x Avogadro's number.Calculate the total number of protons: Total protons = number of gold atoms x 79.