Answer:
MethodsPart A – Preparation of reference hot or cold packsEach group had either hot packs (CaCl2) or cold packs (NH4NO3). Each hot/cold pack was prepared in 20.0mL of water. We used a beaker to consistently measure 20.0mL of water for each trial. We then placed 20.0mL of deionized water in a 100mL beaker. The initial temperature of thewater was measured. My lab partner and I added about 1.0 grams of calcium chloride for hot packs. After the calcium chloride was added, we stirred gently with the glass stirring rod until the solid dissolved. While doing so, we kept the thermometer in the solution and recorded the final temperature change. We monitored the temperature change closely and recorded the maximum temperature. Once that was recorded, we disposed of the solution and dried the glassware carefully. We repeated step 2 again, using 4.0 grams of solid and 8.0 grams of solid. Before beginning Part B, we completed results # 1-2.Part B- Preparation of desired hot or cold packAfter completing results #1-2, we used the answer from results #2 to prepare a 20.0mL hot pack that reached the desired temperature. Once, finished our results were shared on the board. On the board, we reported our data to the class for “grams of solid used” and “final temperature reached”.
Explanation:
If the pressure of a fixed mass of gas is doubled at a constant temperature, the
volume of the gas will be:
1/4 as much.
O twice as much
half as much
the same.
Answer: half as much .hope this helped
Explanation:
an acid is added to water. explain what type of bonding may take place
Explanation:
All chemical substances has certain chemical nature that is whether it is :
Acidic Basic NeutralAcidic
It is a substance that in water produce hydrogen ions .
Like HCl ------> H⁺ + Cl⁻
When these kind of ions are released in water , they further combine with water to form hydronium ion that is :
HCl ------> H₃O⁺ + Cl⁻
(hydronium ion)
The bonding in them is a coordinate bond that is : A bond formed between a donor and a acceptor as in it there is no mutual sharing of electrons ,Therefore it is also called as dative bond . The structure of hydronium ion is attached below .
Bases
They are those when dissolved in water produce hydroxide ion .
That is : NaOH-------> Na ⁺ + OH⁻
What property of metals allows them to be shaped into wires?
Answer:
Ductility
Explanation:
Ductility is the ability of a metal to be converted into a thin wire without getting break and loosing its hardness. The property of Ductility of a metal allows us to make a wider use of them. Some most ductile metals are gold, silver, copper etc. whereas some of the metals with very less ductility are tungsten, steel and other alloys as they are very hard to transform into a thin wire.
A metal with less ductility can be malleable as it can have the ability to be converted into a thin sheet. Not all the metals are ductile but some of them have high ductility, some have less and some of them are non ductile.
When a chemical reaction occurs,
the physical and chemical properties of the reactants are the same as the properties of the products
the compounds can be separated by physical means
O a phase change takes place
the physical and chemical properties of the products are different from the reactants
Explanation:
Chemical reaction '
It is a reaction in which two or more substances react to form some new substance .
The substances that react are called "reactants " and the new ones that are formed are called "products ".
A + B ---> C + D
(reactants ) (products )
In a chemical reaction :
Reactants undergoes a chemical change .The products cant be separated by physical method .For every chemical reaction there is some identification property .During chemical reaction , energy changes occur .During chemical reaction :It is seen that physical and chemical properties of the products are different from the reactantsWhy is it not to use resolidified sample in melting point determination
Answer:
It is advisable to use a fresh sample and not a re-solidified one when determining melting point of a substance because when the sample is melted once, it changes its crystal lattice structure to a certain extent. This can cause it to melt at a different temperature the second time around, which will not be an accurate reading.
Explanation:
The temperature at which a substance changes state from its solid form to its liquid form is known as the melting point for that substance. At this temperature, a pure substance will have both its solid as well as liquid states existing in equilibrium with each other.
When a pure, crystalline sample is melted the first time to determine its melting point, its crystal lattice structure gets distorted to a certain extent with the rising temperature. Even if cooled and re-solidified, this original crystalline structure will not melt at the same temperature it did earlier. This is because its crystal lattice is different this time around, leading to an incorrect melting point reading.
AgNO3 + Cu=_Cu(NO3)2 + Ag
need help balancing this equation
Answer:
2AgNO3 + Cu = Cu(NO3)2 + 2Ag
Explanation:
This is a simple substitution reaction.
For the equation to be balanced, the total number of elements on each side of the equation must be equal.
The right hand side contains 2 nitrogen and 6 oxygen, to balance this on the left add 2 to the back of silver nitrate. Thus silver on the right hand side of the equation must be 2.
Thus the equation is balanced.
Final answer:
To balance the chemical equation for the reaction between copper and silver nitrate, ensure you have an equal number of atoms for each element on both sides of the equation, resulting in 2 AgNO3 (aq) + Cu (s) → Cu(NO3)2 (aq) + 2 Ag (s).
Explanation:
To balance the chemical equation Cu (s) + AgNO3(aq) → Cu(NO3)2 (aq) + Ag (s), follow these steps:
Identify the reactants and products to understand what symbols go on each side of the arrow and where the + signs go.
Write the correct formulas for all compounds and elements, ensuring all ionic compounds are charge balanced.
Balance the equation by ensuring the same number of atoms of each element appears on both sides of the reaction.
Here is the balanced chemical equation:
2 AgNO3 (aq) + Cu (s) → Cu(NO3)2 (aq) + 2 Ag (s)
This reaction is an example of a single replacement reaction where silver (Ag) is displaced by copper (Cu). The copper starts as a solid and is oxidized to copper (II) nitrate, while silver nitrate is reduced to solid silver. Remember that the charge conservation is important, and therefore the number of electrons and the total charge must remain equal on both sides of the equation.
!!HELP ASAP!! How does temperature affect the rate of a reaction?
A. Increasing the temperature lowers the activation energy of the
reaction.
B. Increasing the temperature increases the concentration of the
reactants.
C. Increasing the temperature decreases the potential energy of the
reactants.
D. Increasing the temperature gives the molecules more kinetic
energy
Answer:
D. Increasing the temperature gives the molecules more kinetic energy.
Increasing the temperature gives the molecules more kinetic energy. Hence, option D is correct.
What is the rate of a reaction?The rate of a reaction is the speed at which a chemical reaction takes place.
Temperature is also known as the average kinetic energy of molecules.
Some atoms used to have sufficient kinetic energy to react, while others do not.
Increasing the temperature indicates that more numbers of molecules will have sufficient kinetic energy to react and reactions will take place more frequently.
Hence, increasing temperature increases the reaction rate.
Thus, option D is correct.
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Function C gives the cost, in dollars, of buying n apples. 6. Which statement best represents the meaning of C (10) = 9?
a. the cost of buying 9 apples
b.the cost of 9 apples is $10
c.the cost of 10 apples
d. ten apples cost $9
Answer:
D. Ten apples cost $9
Explanation:
C, the cost in dollars of buying apples is a function of the number (n) of apples bought
C (10) = $9 implies that the cost of buying 10 apples is $9
The statement 'C (10) = 9' means that ten apples cost $9 based on the given function C which represents the cost of buying n apples.
Explanation:The question is asking for the interpretation of the mathematical function C(n) = 9 when n is 10. In this case, C(10) = 9 means that the cost of 10 apples is $9. This is based on the provided function C which represents the cost of buying n number of apples. So, when n is 10, the cost is 9 dollars. This interpretation is similar to how we calculate the cost of buying fruits in chapters 8 and 9, by multiply the quantity of each fruit by the price.
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1. In order for a chemical reaction to occur, there
must always be
(1) an effective collision between reacting particles
(2) a bond that breaks in a reactant particle
(3) reacting particles with a high charge
(4) reacting particles with high kinetic energy
Final answer:
Chemical reactions require colliding particles with sufficient energy and proper orientation at the time of collision.
Explanation:
Chemical reactions require a few conditions to occur. Firstly, the reactant particles must collide with each other. The more frequent the collisions, the faster the reaction. Secondly, the particles must collide with sufficient energy to break the old bonds. Lastly, the particles must have proper orientation at the time of the collision.
The correct response is (1) an effective collision between reacting particles. For a chemical reaction to occur, reactant particles must collide with correct energy and orientation, surpassing the activation energy.
To answer the question, let's explore the requirements for a chemical reaction to occur according to the collision theory.
Effective collision: Reactant particles must collide with one another. Only collisions that have the correct energy and orientation lead to a reaction.Orientation: The molecules must align in a way that allows bonds to break and new bonds to form.Activation energy: The particles must collide with enough energy to surpass the activation energy barrier, which is the minimum energy needed to initiate the reaction.Given these points, the correct choice is: (1) an effective collision between reacting particles.
Determine the empirical formula for c6n4o10
Explanation:
We are given with compound C₆N₄O₁₀: mass percentage of all is :
For C = 12 x 6 /288=0.25%
For N= 14 x 4 /288=0.19%
For 0= 16 x 10/288=0.5%
The elements present are :
Atomic mass moles Simplest ratio rounding off
C 12 0.25/12=0.020 0.02/0.02=1 2
N 14 0.9/14=0.06 0.06/0.02=3 6
O 16 0.5/16=0.03 0.03/0.02=1.5 3
The empirical formula derived is : C₂n₆O₃
what are possible reasons for a percent yield that is under 100%
Answer:
Percentage Yield is given as,
%age Yield = Actual Yield / Theoretical Yield × 100
This shows that the %age yield is directly depending upon the actual yield. And most of the time the percentage yield is less than 100 % because of the following factors.
Impure Starting Materials:
If the starting materials (reactants) are not pure then reaction will not completely form the desired product. Different by products will form which will decrease the %age yield.
Incomplete Reactions:
Not all reactions go to completion. In many reactions the starting material after some time stops forming the product due to different conditions. Some reactions attain equilibrium and stop increasing the amount of product. While, in some reactions a by products (like water) formed often react with the product to give a reverse reactions. Hence, the chemistry of reactions also causes the decrease in %age yield.
Handling:
Another major reason for decrease in yield is handling the product. Always some of the product is lost during the workup of the reaction like, taking TLC, doing solvent extraction, doing column chromatography, taking characterization spectrums. So, we can conclude that the %age yield will always be less than 100%.
What is the mole ratio that can convert from moles of A to moles of B?
To convert from one mass (stuff A) to another (substance B), first convert A's mass to moles, then apply the mole-to-mole conversion factor (B/A).
Convert moles ratio:A's mass to moles, then apply the mole-to-mole conversion factor (B/A), and then convert B's mole quantity back to grams.
There is no straightforward conversion from one substance's mass to that of another. To convert from one mass (stuff A) to another (substance B), first convert A's mass to moles, then apply the mole-to-mole conversion factor (B/A), and then convert B's mole quantity back to grams.
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A compound is found to contain 73.23% xenon name 26.77% oxygen by mass. What is the empirical formula for this compound ?
The empirical formula is XeO₃.
Explanation:
Assume 100 g of the compound is present. This changes the percents to grams:
Given mass in g:
Xenon = 73.23 g
Oxygen = 26.77 g
We have to convert it to moles.
Xe = 73.23/ 131.293 = 0.56 moles
O = 26.77/ 16 = 1.67 moles
Divide by the lowest value, seeking the smallest whole-number ratio:
Xe = 0.56/ 0.56 = 1
O = 1.67/ 0.56 = 2.9 ≈3
So the empirical formula is XeO₃.
What is the mass of a cylinder of lead that is 1.80 in in diameter, and 4.12 in long. The density of lead is 11.4 g/mL.
Answer:
124.26g
Explanation:
Diameter = 1.80 , length (h) = 4.12 , density = 11.4
Density = mass / volume
Volume = area x height
Area = #d2 ➗ 4
Where #(pi) = 3.142
Area = 3.142 x 1.80 square ➗ 4
Area = 10.2/4 = 2.6
Volume = area x height
Volume = 2.6 x 4.2=10.9
Density = mass / vol
Mass = density x vol
Mass = 11.4 x 10.9
Mass 124.26g
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dialysis is used to purify blood, sea water, and polluted drinking water. true or false?
amount in the lab to be 1.24g. However the accepted value is 1.30g. Calculate percent error.
Yo sup??
given value=1.24 g
expected value=1.30 g
Percentage Error=(expected value-given value/expected value)*100
=(0.06/1.3)*100
=4.62 %
Hope this helps.
Final answer:
The percent error for the chemistry experiment, given the theoretical yield (accepted value) of 1.30g and actual yield (amount in the lab) of 1.24g, is calculated to be 4.62%.
Explanation:
To calculate the percent error in this chemistry experiment, we can use the formula:
The % error of the yield = | [Theoretical Yield - Actual Yield] / Theoretical Yield x 100%|
In this case, the theoretical yield (accepted value) is 1.30g, and the actual yield (amount in the lab) is 1.24g. Applying the formula:
% error = |[1.30g - 1.24g] / 1.30g x 100% |
= |[0.06g] / 1.30g x 100% |
= | 0.046154 x 100% |
= 4.62%
Therefore, the percent error for this experiment is 4.62%.
what is the region surrounding the nucleus which is occupied by electrons?????? its a crossword ( _ _ _ _ _ _ _ _ C _ _ _ _)
Answer:
Electron cloud
Explanation:
The electron cloud is an informal term in chemistry and physics. This region describes the negatively charged electrons in their orbit surrounding the nucleus in an atom. The nucleus has protons in it that have a positive charge on it. It is not easy to know where exactly an electron in any specific time but the electron cloud helps to know electron is moving in this specific area.
How many zinc atoms are there in 65.4 g?
molar mass of Zn is 65.38 g/mol≅65.4 g/mol
65.4 g Zn* 1 mol Zn/64.4g* (6.022*10^23) atoms/1 mol Zn
hence, there are 6.022*10^23 atoms
* Need ASAP * Explain the relationship between percent composition, Empirical formula, and molecular formula.
By dividing the percentage composition with the molar mass of that element we will get the empirical formula. Then using that empirical formula and formula mass we can find the molecular formula.
Explanation:
The chemical properties of any substance are defined obviously by the different types and relative amounts of atoms constituting its primary entities (in case of covalent compounds the primary entities are molecules and ions in the event of ionic compounds).
A percent composition of any compound gives the mass percent of each element present in the compound; in addition to that frequently it is determined experimentally and utilized to derive an empirical formula of any compound. An empirical formula mass of any covalent compound could be comparable with the molar or molecular mass of a compound to acquire a molecular formula.
Meiosis is significant to most living organisms because it:
A. keeps prokaryotic organisms separate from eukaryotic organisms.
O
B. allows sexual reproduction to maintain the diploid chromosome
number.
O
c. makes gametes with four times the haploid number of the
species.
D. causes the chromosome number of a species to change when it
needs to.
The significance of meiosis in living organisms is that it allows sexual reproduction to maintain the diploid chromosome number by producing haploid gametes, which upon fertilization, restore the diploid condition.
Meiosis is significant to most living organisms because it allows sexual reproduction to maintain the diploid chromosome number. In sexual reproduction, genetic material from two individuals is combined to produce genetically diverse offspring. The process of meiosis is a series of events that arrange and separate chromosomes into cells, thereby reducing the chromosome number by half to produce haploid gametes. Fertilization then involves the fusion of these haploid gametes from two individuals to restore the diploid condition in the new zygote, hence, maintaining the species' chromosome number through generations.
The correct answer to the student's question is B. allows sexual reproduction to maintain the diploid chromosome number. This answer is supported by the understanding that meiosis produces genetically unique reproductive cells, called gametes, which have half the number of chromosomes as the parent cell. When two gametes fuse, they restore the original diploid state of the organism's chromosomes.
A sample of a gas is placed inside a cylinder that is a led size. The cylinder is heated as additional gas
is added to it. What will most likely happen to the pressure of the gas inside the cylinder?
It will decrease.
It will increase.
It will not change.
Final answer:
When a gas in a fixed-volume cylinder is heated and additional gas is added, the pressure of the gas will most likely increase due to more frequent and forceful collisions of gas molecules with the container's walls.
Explanation:
The question is about what will happen to the pressure of the gas inside a cylinder when it is heated and additional gas is added. According to the principles of gas laws, specifically the combined gas law, which is related to pressure (P), volume (V), and temperature (T) of a gas, the pressure of the gas will increase if the temperature of the gas increases while the volume remains constant.
When the number of gas molecules is increased in a fixed volume, there is less space for the molecules to move, which means they will collide with the walls of the container more frequently, leading to an increase in pressure. Additionally, heating the gas will increase the kinetic energy of the molecules, resulting in more forceful collisions and therefore an increase in pressure.
Which of the following is the si unit of acceleration
Answer:
C
Explanation: Acceleration is defined as the rate of change of velocity with time i.e acceleration = velocity/time.
but velocity is defined as distance moved in one second i.e velocity = distance / time.
distance is measured in meter (m) and time in second (s), then, acceleration = m/s/s. which is meter/second² i.e m/s²
The SI unit of acceleration is meters per second squared (m/s²). It represents the rate of change of velocity per unit of time.
Explanation:The SI unit of acceleration is metres per second squared (m/s²). It is a measure of how quickly an object changes its velocity. For instance, continue driving a car starting from rest, if your speed grows by 6 m/s every second, then your acceleration is 6 m/s². Here, 'metres per second' shows the velocity change and squaring it (second squared) shows the time duration over which this change occurs.
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A photon detector captures a photon with an energy of 5.45 ✕ 10^−19 J. What is the wavelength, in nanometers, of the photon?
Answer:
364 nm
Explanation:
The formula for the energy (E) of a photon in terms of its wavelength λ is
E = hc/λ
We can rearrange this formula to give
λ = hc/E
If E = 5.45 × 10⁻¹⁹ J, then
[tex]\begin{array}{rcl}\lambda& = & \dfrac{6.626 \times 10^{-34} \text{ J$\cdot$s} \times 2.998 \times 10^{8}\text{ m$\cdot$ s}^{-1}} {5.45 \times 10^{19} \text{ J}}\\\\& = & 3.64 \times 10^{-7} \text{ m}\\& = & \textbf{364 nm}\\\end{array}\\[/tex]
How many grams of aluminum can react with 336g oxygen? 4Al + 3O2 --> 2Al2O3
Answer: 714 g Al2O3
Explanation: Solution attached
First convert mass of O2 to moles
Do the mole ratio between O2 and Al2O3 from the balanced equation.
Convert moles of Al2O3 to mass using its molar mass.
In a chemical reaction, 378 grams of aluminum can react with 336 grams of oxygen to form aluminum oxide, calculated using stoichiometry based on the balanced chemical equation.
The calculation of how many grams of aluminum can react with 336g of oxygen involves using stoichiometry, a technique in chemistry to calculate amounts of reactants and products.
The balanced chemical equation given is 4Al + 3O2 ⇒2Al2O3. First, we need to find the number of moles of oxygen by dividing the given mass of oxygen by its molar mass (32 g/mol for O2, thus 16 g/mol for O). Next, using the mole ratio from the balanced equation, calculate the moles of aluminum required to react with the obtained moles of oxygen. Finally, convert the moles of aluminum to grams using the molar mass of aluminum (27 g/mol).
The process will involve these steps:
Find moles of O2: 336 g O2 × (1 mol O2 / 32 g O2) = 10.5 mol O2.Using the mole ratio (4 mol Al : 3 mol O2), calculate moles of Al: 10.5 mol O2 ×(4 mol Al / 3 mol O2) = 14 mol Al.Convert moles of Al to grams: 14 mol Al × (27 g Al / 1 mol Al) = 378 g Al.Therefore, 378 grams of aluminum can react with 336 grams of oxygen to form aluminum oxide.
A new technology company is marketing drones for residential use. The bar graph shows the relation between number of sales and three types of marketing strategies over the company’s first five months of operation. What are the two biggest advantages of using a bar graph to display this kind of data? The graph provides a comparison of the different marketing strategies. The graph helps in selecting the best marketing strategy to improve sales. The graph helps to predict future sales near the end of the calendar year. The graph indicates how many people see the posted advertisements. The graph gives information about the number of people who have received emails.
Answer:
1- The graph provides a comparison of the different marketing strategies
2- The graph helps in selecting the best marketing strategy to improve sales
Explanation:
Hope this help
plz mark brainliest
Have a nice day!!!
Answer: You need 2 answers:
The graph provides a comparison of the different marketing strategies.
The graph helps in selecting the best marketing strategy to improve sales.
Explanation: I just took the test and these are correct.
Which would be the biggest long-term benefit of building a city recycling center? A. building the new recycling building
B. supplying citizens with new collection bins
C. reducing the amount of garbage
D. operating new trucks for pickup service
C. reducing the amount of garbage
Explanation:Building a city recycling center has several potential benefits, but the biggest long-term benefit would be reducing the amount of garbage. By decreasing the need to haul trash to landfills, the city can lower disposal costs, reduce environmental impact, and conserve natural resources. Additionally, it can encourage more sustainable practices among businesses and residents, further reducing waste production and improving overall environmental health.
What is a hypothesis?
A. analysis based on an observation.
B. a proposed answer to a question.
C. a conclusion based on analysis.
D. data gathering during an experiment.
Answer:
B
Explanation: it is the correct answer
Which of the following is an inference?
a.
The flower is pink.
b.
Vinegar has a pungent aroma.
c.
A dog barks.
d.
A cup with steam coming from it will be hot to the touch.
Please select the best answer from the choices provided
A
B
C
D
Answer:
the answer is d
Explanation:
but wusup shawty
Final answer:
Among the provided options, 'A cup with steam coming from it will be hot to the touch' is an example of an inference because it is a conclusion based on the observation of steam, indicating the cup's contents are hot.
Explanation:
The question asks for the identification of an inference among four options. An inference is a conclusion reached based on evidence and reasoning rather than from explicit statements. Option d, 'A cup with steam coming from it will be hot to the touch', is an inference because it is a conclusion that one arrives at after observing steam, which suggests that the liquid inside the cup is likely hot.
Inference Examples
I didn't realize that they are husband and wife - an inference about their relationship.Who stole my durian smoothie? - an inference that someone took it without permission.In the context of a joke, the question 'How many months have 28 days?' with the answer 'All of them' involves linguistic or logical inference as it plays on the expectation that people will think of February alone.
How many molecules are there in 4.00 moles C3H6O3
HELP!
[tex]2.4088 \times 10^{24} \text { molecules }[/tex] are there in [tex]4.00 \text { moles } C_{3} H_{6} O_{3}[/tex]
Explanation:
One mole = [tex]6.022 \times 10^{23}[/tex] (Applicable to the substances like ions, molecules, or atoms). This specified number is called as Avogadro's constant or number. This idea helps us to convert number of moles of a substance to the number of molecules, multiply moles by Avogadro's number, [tex]6.022 \times 10^{23}[/tex]
Given:
[tex]4.00 \text { moles } C_{3} H_{6} O_{3}[/tex]
To find the number of molecules in it
By using Avogadro’s number, convert given moles into molecules as below,
[tex]\text { 4.00 moles } C_{3} H_{6} O_{3} \times \frac{6.022 \times 10^{23} \text { molecules }}{1 \text { mole } C_{3} H_{6} O_{3}}[/tex]
By solving the above, we get
[tex]Number of molecules of $C_{3} H_{6} O_{3}=24.088 \times 10^{23}$[/tex]
[tex]Number\ of\ molecules\ of\ C_{3} H_{6} O_{3}=2.4088 \times 10^{24}\ molecules\ C_{3} H_{6} O_{3}[/tex]
3. Which inclined plane has a greater mechanical advantage? Figure A or Figure B?
Figure A
Figure B
(
Figure A has a greater mechanical advantage
Figure B has a greater mechanical advantage
Figure A and B have the same mechanical advantage
none of the above
figure B has greater mechanical advantage
Explanation:
The mechanical advantage of a machine is the ratio between the output force and the input force.
For a ramp, the (ideal) mechanical advantage of a machine is also given by the formula
[tex]MA=\frac{L}{H}[/tex]
where
L is the lenght of the ramp
H is the height of the ramp
Therefore, in order to compare the mechanical advantage of these two ramps, we have to compare their ratio L/H.
By looking at the figure, we notice that:
- Figure A has greater height H and shorter length L
- Figure B has smaller height H and longer length L
This means that the ratio L/H is larger for figure B: therefore, figure B has greater mechanical advantage.
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