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a student determined in the laboratory that the percent by mass of water in cus04 5h20 is 38.0% if the accepted value is 40% what is the percent of error
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Final answer:
The percent of error is calculated using the formula: Percent error = (Experimental Value - Accepted Value) / Accepted Value * 100%. In this case, the percent of error is -5%.
Explanation:
The percent of error can be calculated using the formula:
Percent error = (Experimental Value - Accepted Value) / Accepted Value * 100%
Given that the experimental value for the percent by mass of water in CuSO4 • 5H2O is 38.0% and the accepted value is 40%, the percent of error can be calculated as:
((38.0 - 40) / 40) * 100% = -5%
Therefore, the percent of error is -5%.
The percent error in the student's measurement of the percent by mass of water in CuSO4·5H2O is 5.0%. This is calculated by using the formula for percent error, which yields a percent error of 5.0%.
Explanation:The student determined that the percent by mass of water in CuSO4·5H2O is 38.0%, but the accepted value is 40%.
To calculate the percent error, we use the formula:
Percent Error = (|experimental value - accepted value| / accepted value) × 100%
Substituting the given values:
Percent Error = (|38.0% - 40.0%| / 40.0%) × 100%
Percent Error = (2.0% / 40.0%) × 100% = 5.0%
Thus, the percent error in the student's measurement is 5.0%.
humans protect themselves from natural disasters by all of the following expect ?
a. dams
b. sunscreen
c. building homes and shelters
d. levees
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my answer will be letter B
ma bad. hope u still get something from these
what element has two electrons in its 4d sub level?
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"Zr and because 1s22s22p6., 3s23p63d10, 4s2,4p6,4d2 , 5s2
so total electrons = 40 so atomic number 40 is of Zr"
Answer is: zirconium (Zr).
Atomic number of zirconium (Zr) is 40, which means it has 40 protons and 40 electrons.
Electron configuration of zirconium atom:
₄₀Zr 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d²5s².
Zirconium has four valence electrons, it is in group 4 and period 5.
Zirconium is a lustrous, grey-white, strong transition metal.
What is the volume of an aluminum cube whose edges are 10 cm long?
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volume is length*with*height so 10*10=100*10=1000
Why is it important for the buret to be clean before using? How do you clean a buret
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Acids will corrode most _____.
bases
liquids
metals
gases
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Acids will corrode most metal.
I hope this helped if you have anymore question I'll be glad to help ;)
Technological design is a main focus in the field of _________.
A. biology B. chemistry C. mathematics D. engineering
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Technological design is the main focus in the field of engineering.
Answer: Letter D ✅
Hope that helps! ★ If you have further questions about this question or need more help, feel free to comment below or post another question and send the link to me. -UnicornFudge aka Qamar
How will the following system react when an increase in pressure occurs? Note: all species are gases. N2O4 <--> 2NO2 Question 9 options:
a. More N2O4 is produced.
b. There is no way to predict how the increase in pressure will affect this system without more information.
c.No change occurs.
d.More NO2 is produced.
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As all species are gases, over more pressure, the side of the reaction with fewer gas molecules will be favoured as it is the one that occupies less space, where more molecules would fit in lesser space. N₂O₄ has the same number of atoms of 2NO₂, but the difference is that they are only in one molecule - occupy less space because all the atoms are closer to each other.
a is incorrect just took the test
Describe the preparation of 2.00 L of 0.100 M glycine buffer, pH 9.0, from glycine and 1.00 M NaOH.
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How do the cells of a multicellular organism differ from those of a unicellular organism
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Answer:
The cells of unicellular organism is not equipped for different function which means that it do not have different types of cells differentiated into different types performing different functions.
They are made of single cells that perform all the essential functions necessary for survival of organism.
Whereas, a multicellular organism have different types of cells that are employed for different functions.
Example:The hepatocytes are equipped for filtering blood and waste removal. The red blood cells are equipped to transport oxygen to various parts of the body.
How many protons are in an element with an atomic number or 8 and a mass number of 18?
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When might a technique called water displacement be used?
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is NaCH an element ? why or why not?
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Which of the following neutral atom configurations satisfies the octet rule?
A. 1s2 2s2 2p6 3s2 3p6
B. 1s2 2s1
C. 1s2 2s2 3s2 3p4
D. 1s2 2s2 3s2 3p6 4s1
Which group of atoms always has a complete octet, a full s and p orbital at the end of the configuration?
A. alkaline earth metals, Group 2A
B. halogens, Group 7A
C. noble gases, Group 8A
D. transition metals
A neutral atom of sodium (Na) has 11 electrons and an electron configuration of 1s2 2s2 2p6 3s1. How will it ionize to achieve an octet in its valence shell?
A.It will gain 7 electrons in the 3rd energy level to have a valance configuration of 3s2 3p6.
B.It will lose 1 elecrtron for the 3rd energy level to have a valance configuration of 1s2 2s2 2p6
C.It will not ionize, it already has an octet of electrons in its valance shell.
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2-c
3-b
Study ur lessons Xd
The electronic configuration which satisfy octet rule is option A. The group which have a complete octet always is noble gas group. Thus option C is correct. The sodium atom will lose electron to achieve octet rule. Thus option B is correct.
What is octet rule ?According to rule of octet, the atom which attains 8 electrons in its valence shell is said to be stable. Thus every atoms are thriving to attain stability by taking part in reaction through which they can gain or lose electrons.
In the given electronic configuration option A satisfy the octet rule, since, it have 6 electrons in its valence shell which are located in 3s and 3p.
Group 18 namely noble gas elements have completely filled valence orbitals and thus, they need no electrons or they cannot lose electrons to maintain their stability. Thus, option C is correct.
Sodium contains 1 electron in its valence shell. If it lose that one electron and ionizes to Na+ then the its next shell containing 8 electrons will be stable and thus option B is correct.
To find more about octet rule, refer the link below:
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A neutral atom of beryllium (Be) has an average mass of 9 amu and 4 electrons. How many neutrons does it have?
13
9
5
4
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To find the number of electrons, just subtract the amu and the atomic number (aka number of protons or electrons)...
so it is...
9-4=5 neutrons
Brainliest plz! :)
The number of neutrons in a neutral atom of beryllium is equal to 5. Therefore, option (B) is correct.
What is a neutral atom?A neutral atom can be defined as an atom in which the number of the negative charge is equal to the number of the positive charge. Therefore, the overall electric charge on the neutral atom is zero.
We can say that for a neutral atom, the number of protons in an atom is equal to the number of electrons in that atom. All elements arranged in the modern periodic table are in a neutral state.
The atomic mass or average mass of the atom is the sum of the number of protons and neutrons in the nucleus of that atom.
Given, the average mass of beryllium (Be) atom = 9 amu
Therefore, protons + neutrons = 9 in the one Be atom
The number of electrons in Be atom = 4
The number of neutrons in netural beryllium atom = 9 - 4 = 5
Learn more about the neutral atom, here:
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The _______ is the layer of the atmosphere nearest to Earths surface
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~PutarPotato
Many older windows have only a single pane of glass. Why do these windows not insulate well?
A. Glass conducts heat better than air.
B. Glass conducts cold better than air.
C. Air conducts heat better than glass.
D. Air conducts cold better than glass.
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is it convection conduction or radiation "air travels this way" please answer
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What is true of sexual reproduction that brings together genetic material from two parents?
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How does an individual figure the total force exerted on an object by two forces acting in opposite directions?
A. Add the two forces together.
B. Subtract the smaller force from the larger force.
C. Multiply the larger force by the smaller force.
D. Divide the smaller force by the larger force.
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Is rust a pure substance or a mixture? <3
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Rust is considered a mixture, not a pure substance, because its composition can vary. It is formed when iron reacts with oxygen and water.
Explanation:Rust is not a pure substance, it is a mixture. In scientific terms, rust is formally known as iron (III) oxide and is formed when iron reacts with oxygen and water. In this case, it behaves as a mixture because its composition can vary depending on the presence and relative abundance of other elements and compounds, such as water and other oxides.
Rust is a mixture rather than a pure substance. It is formed when iron reacts with oxygen in the presence of water or moisture, resulting in the formation of iron oxide, which is the reddish-brown substance we commonly refer to as rust. This mixture consists of iron oxide as well as other impurities, such as traces of water and other metals present in the environment.
Learn more about Rust here:https://brainly.com/question/35869805
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After a hormone enters the bloodstream, it is transported throughout the body, but the hormone only affects certain cells. The reason only certain cells are affected is that the membranes of these cells have specific
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Final answer:
Only certain cells are affected by hormones because these cells have specific receptor proteins that allow the hormone to bind and initiate a response. These receptors determine the cell's sensitivity to the hormone and can vary through up-regulation or down-regulation, adapting to hormone levels.
Explanation:
The reason only certain cells are affected by hormones is because only some cells have receptor proteins that can bind to a given hormone. These receptors are specific to a particular hormone and allow it to have an effect when it binds to them.
The hormone will travel throughout the bloodstream until it finds a cell with the correct receptor and binds to it, which initiates various responses depending on the type of hormone, such as a steroid hormone or a non-steroid hormone.
Hormones, acting as messengers, are crucial in regulating physiological processes. They play a significant role in human reproduction, development, metabolism, and maintaining homeostasis, among other functions.
The presence and quantity of hormone receptors determine which cells will respond to a given hormone, thus determining the sensitivity of the cell to the hormone. Cell sensitivity to hormones can change through processes like up-regulation and down-regulation, which adapt the number of receptors available in response to hormonal levels.
Which type of reaction has the general formula of AB + CD → AD + CB?
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double replacement
Julia wants to find out which color fabric will heat up the fastest when put under a direct light.
So, she places pieces of red, white, and green fabrics outside in the sunlight. Then, she places pieces of black, yellow, and blue fabric inside under a bright lamp. Finally, she measures the temperature of all the fabric samples every 5 minutes.
Will Julia's results be valid?
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Answer:
no to many variables
Explanation:
If the water in a bathtub and a teacup are the same temperature, how do the amounts of their thermal energy compare?
A. They both have the same amount of thermal energy.
B. The teacup has more thermal energy.
C. Thermal energies are equal, with different numbers of joules.
D. The filled bathtub has more thermal energy.
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Suppose you have an Internet friend who study chemistry just like you are your friend claims the change from liquid water to water vapor is a chemical change write a brief email that might convince your friends otherwise
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Final answer:
The change from liquid water to water vapor is actually a physical change, not a chemical change, because the molecular structure of water remains unchanged in both states. Physical changes only affect the form, not the composition, whereas chemical changes involve new substances being created.
Explanation:
Dear Friend,
I understand why you might think that the change from liquid water to water vapor is a chemical change, but in fact, it's a physical change. When water boils and becomes steam, it's simply undergoing a phase change; the molecular structure of water (H₂O) remains the same in both its liquid and gas states. This means that it's still water even when it's in the form of steam.
The difference between physical and chemical changes is that physical changes only affect the form of a substance, not its chemical composition. For instance, when we see ice melting into water or water evaporating into steam, the arrangement of the molecules changes, but the molecules themselves remain intact. In contrast, chemical changes involve making or breaking chemical bonds to create new substances, like when gasoline burns or milk sours.
So, when we consider a phase change like vaporization of liquid water to steam (H₂O(l) → H₂O(g)), it is a reversible process that does not alter the composition of the substance. If you cool the water vapor, it will condense back into liquid water. The same molecule, just a different phase.
Warm regards,
Your Chemistry Friend
An apple has a mass of 297 grams. How many kilograms is this? (Note: You can use the information in the table below to make a conversion factor.)
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Answer: 0.297 grams.
Explanation: the conversion factor between kilograms and grams is:
1 kg=1000 g
applying this factor to the given mass of an apple, we have:
[tex]297 grams *\frac{1 kg}{1000 grams}[/tex]
as we can see, we just have to divide by 100 so:
297 grams= 0.297 kg.
The apple has a mass of 0.297 kilograms
HOW TO CONVERT GRAMS TO KILOGRAMS:
Grams and kilograms are both units of measuring mass, however, they are not the same. The conversion factor of grams and kilograms is as follows:1 kilogram = 1000 grams
According to this question, an apple has a mass of 297 grams. This means that:If 1 kilogram = 1000 grams
297 grams = 297 ÷ 1000
= 0.297 kilograms
Therefore, the apple has a mass of 0.297 kg.
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An unknown solution has a pH of 2. How would you classify this solution?
A. Acidic
B. basic
C. Neutral
D. There is not enough information to answer this question.
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Answer:
The answer is my opinion is A. Acidic.
Explanation:
It is lower than 7 (which is neutral) and lower than 8-14 (basic)
Which one is a true statement about endothermic reactions?
A) The reaction container always feels hot.
B) More heat is given off than is put into the reaction.
C) The reactant have less heat energy than the products.
D) Energy is absorbed making it feel colder.
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Answer;
D) Energy is absorbed making it feel colder.
Explanation;
An endothermic reaction is a reaction in which heat energy is absorbed from the surroundings. In such a reaction the energy of the reactants is less than the energy of the products and therefore the enthalpy change is positive, greater than zero.
An endothermic reaction occurs when the energy used to break the bonds in the reactants is greater than the energy given out when bonds are formed in the products. This means that overall the reaction takes in energy, therefore there is a temperature decrease in the surroundings.
Answer:
I completely agree that it is D) Energy is absorbed making it feel colder!
Is mass conserved when 40 G of sodium hydroxide undergoes a chemical change during an interaction with 36.5 grams of hydrogen chloride?
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Mass is conserved during the chemical reaction between sodium hydroxide and hydrogen chloride, meaning the total mass of reactants equals the total mass of products, which will be 76.5 g after the reaction.
Yes, mass is conserved when 40 g of sodium hydroxide (NaOH) undergoes a chemical change during an interaction with 36.5 grams of hydrogen chloride (HCl). According to the law of conservation of mass, the mass of the reactants in a chemical reaction equals the mass of the products.
For instance, in the reaction NaOH (aq) + HCl(aq) → NaCl(aq) + H2O(l), the mass of NaOH and HCl before the reaction will equal the mass of NaCl and H2O formed after the reaction.
To further explain with an example, if we start with 40 g of NaOH and 36.5 g of HCl, the total mass of reactants is 76.5 g. After the reaction, we will also have 76.5 g of products, divided between NaCl and H2O.