A student investigated temperature changes during a reaction. Figure 2 shows the apparatus the student usesWhat is the biggest error in this investigation.Suggest two improvements to the apparatus which would increase the accuracy of the experiment.
[3 marks]
Answers
Answer:
it is becuse the students used wrong apparatus
The biggest error in this investigation is the use of inappropriate types of equipment.
The types of equipment used in the given setup are inappropriate. Suggested improvements in the apparatus to increase the accuracy are given below:
1. The use of a polystyrene cup in the laboratory for any reaction is inappropriate. As a slight increase in temperature causes the decomposition of the chemicals in the cup as well.
2. The use of a thermometer stand is a must. Without using the stand, the tip of the thermometer touches the lid of the container, which causes inaccuracies in the result.
Hence, all the suggestions are listed above.
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Related Questions
Please help! I will give brainliest.
Answers
because they don’t give a value for nh3 or h2o they only gave one for o2
What is the approximate volume of 280 g of chlorine gas (Cl2) at STP
Answers
78 L Cl₂
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
BracketsParenthesisExponentsMultiplicationDivisionAdditionSubtractionLeft to RightChemistry
Atomic Structure
Reading a Periodic TableSTP (Standard Conditions for Temperature and Pressure) = 22.4 L per mole at 1 atm, 273 KStoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
280 g Cl₂
Step 2: Identify Conversions
[PT] Molar Mass of Cl - 35.45 g/mol
Molar Mass of Cl₂ - 2(35.45) = 70.90 g/mol
[STP] 1 mol = 22.4 L
Step 3: Convert
[DA] Set up: [tex]\displaystyle 280 \ g \ Cl_2(\frac{1 \ mol \ Cl_2}{79.90 \ g \ Cl_2})(\frac{22.4 \ L \ Cl_2}{1 \ mol \ Cl_2})[/tex][DA] Multiply/Divide [Cancel out units]: [tex]\displaystyle 78.4981 \ L \ Cl_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
78.4981 L Cl₂ ≈ 78 L Cl₂
What is the atomic radius
of mercury?
Answers
The answer is 155 pm, hope this helps!
The pH of a solution is 8. Some hydrochloric acid is added to the solution. Suggest the pH of the solution after mixing. pH=.......??
Answers
Answer:
By adding acid to hydrogencarbonate you create a large concentration of CO2 in solution causing the solution to be highly supersaturated. This keeps the pH down as CO2 is in equilibrium with carbonic acid. During the day long mixing the excess CO2 strips off and as acid leaves the solution the pH increases.
Explanation:
Hope it helps
A solution with a pH of 8 will have its pH reduced with the addition of hydrochloric acid.
What is pH?It is the degree of acidity or alkalinity of solutions.
pH ranges from 0 to 14 with 7 being a neutral pH. Any pH below 7 is acidic while above 7 is basic.
Thus, a pH of 8 is basic and the addition of hydrochloric acid will reduce it towards 7 or even below it.
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You are given 0.39 mol of niobium (Nb). How many grams of niobium do you have?
Answers
Answer:
36gNb
Explanation:
0.39 mol Nb*92.91g Nb/1 mol Nb=36 g Nb
Drag each label to the correct location.
We use specific words to describe each type of change in state. Label the arrows to describe the changes of state they
represent
gas
liquid
solid
melting freezing condensation
evaporation sublimation
deposition
Answers
solid —> liquid = melting
liquid —> solid = freezing
solid —> gas = sublimation
gas —> liquid = condensation
gas —> solid = deposition
how can you find the charge on po4
Answers
Answer:
Answer:
Explanation:
I hope it's helpful!
...
PO43- Step 8.
Describe 1 physical property and 1 chemical properties of a metal bicycle
Answers
Answer:
A physical property would be The metal, while a possible chemical property would be a chance of gallium. (Gallium is liquid on hot days)
Explanation:
Question 4 How many grams of LiOH are needed to make 100 ml of a 0.1 M solution?
Answers
Explanation:
0.24 grams of LiOH are needed to make 100 ml of a 0.1 M solution
83.0 g Lithium Cyanide (LiCN)
calculate this to molar mass and moles. Please
Answers
Answer:
32.958 g/mol
2.52 moles
Explanation:
Finding the molar mass:
Use the periodic table to determine the masses of each element
6.94+12.011+14.007=32.958 g/mol
Moles:
83 g*1 mol/32.958 g = 2.5183566964 moles
[tex]\\ \sf\longmapsto LiCN[/tex]
[tex]\\ \sf\longmapsto 7u+12u+14u[/tex]
[tex]\\ \sf\longmapsto 21u+12u[/tex]
[tex]\\ \sf\longmapsto 33u[/tex]
[tex]\\ \sf\longmapsto 33g/mol[/tex]
Given mass=83gNo of moles=Given Mass/Molar mass[tex]\\ \sf\longmapsto \dfrac{83}{33}[/tex]
[tex]\\ \sf\longmapsto 2.5mol[/tex]
Two tennis balls are dropped at the same time. One tennis ball is dropped from the roof of a two-story house. The other tennis ball is dropped from 1 m off the ground. Which tennis ball will be moving the slowest as it hits the ground? Why?
Answers
Which structures join with the cell’s membrane during exocytosis?
Answers
Answer:Exocytosis is also used to integrate new proteins into the cell membrane. In this process, the new protein is formed inside the cell, and migrates to phospholipid bilayer of the vesicle. The vesicle, containing the new protein as a part of the phospholipid bilayer, fuses with the cell membrane.
Explanation:
Which of the following questions will allow you to determine if a population of organisms are MOST LIKELY a result of natural or artificial selection? A. How similar are the organisms to their parents? B. How many different traits are there in the population of organisms? C. Do the organisms have traits that are valuable to humans but are poorly suited to the wild? D. Were the organisms produced by sexual or asexual reproduction?
Answers
Answer:c
Explanation:
substances can be categorised in two ways: as an element, mixture or compound ora as a solid, liquid or gas. which
of these methods Is of most use ti chemist?
Answers
Answer:
Most substances on earth are compounds and most interesting chemistry is done with compounds. Most interesting chemistry is done with mixtures of compounds although they often start with pure compounds and then do reactions as mixtures. Most chemistry is carried out in liquid solutions made up of compounds that are solids, liquids, or gases in their pure form.
Explanation:
Here, we are required to determine which of these methods of classifying substances is most important to chemists.
The most useful classification of compounds to chemists is as Elements, Compounds or MixturesFirst classification of substances involves categorising them as pure substances (elements and compounds) or mixtures.
The second classification of substances is categorisation with respect to their state of matter. In essence, we can have solid, liquid or gas.
However, the most useful classification of compounds to chemists is as Elements, Compounds or Mixtures.This is so because, the type of matter present in Elements are distinct for each element, same as for Compounds and Mixtures formed from a combination of pure substances.
Chemists focus on the diverse properties of substances, as such classification as elements, compounds and mixtures provides a wide basis for the qualitative and quantitative analysis of the properties of substances.Classification of substances as solid, liquid or gas leaves a narrow avenue for the study of substances as the substance still contains the same type of matter, only this time in different states.Read more:
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Analyze the definition of light-year. Why is it in space we use light-year to
measure distance? *
Answers
Answer:
Because the distance is too far to count with any other way
Explanation:
Picture a neutral Satom. This neutral atom will have
valence electrons. To reach a more stable configuration, this atom will
(gain, lose) electrons. The charge of the ion that forms will be
ASAP PLEASEE
Answers
Answer:
it will have 6 valence electrons
it will gain electrons
charge will be 2-
What are the three types of Covalent bonds? and what is the difference between them?
Help!!!
Plsss fastt
Answers
Answer:
Covalent bonds can be single, double, and triple bonds.
Explanation:
Single bonds occur when two electrons are shared and are composed of one sigma bond between the two atoms. Double bonds occur when four electrons are shared between the two atoms and consist of one sigma bond and one pi bond.
What is the measurement between two points known as?
Answers
Answer:
The measurement between to points is known as the distance
Which is the function of a cell′s nucleus
Answers
Answer:
The cell's nucleus controls the activities of a cell and carries genes that contain information.
The table below lists the naturally occurring isotopes of element X. Calculate the average atomic mass.
Mass of isotope Relative abundance
15.33 amu 28.60%
17.26 amu 13.30%
18.11 amu 58.10%
A) 17.65 amu
B) 17.11 amu
C) 16.90 amu
D) 17.20 amu
Answers
Answer:
D
Explanation:
I think it is D
HELP ASAP!!!!!! 30 PTS
Mouth, throat, kidney, and stomach cancers can each be linked to a common cause.
Which can be a cause of any of these cancers?
UV radiation
tobacco use
diabetes
sickle cell anemia
Answers
Answer:
Tobacco use
Explanation:
Smoking causes cancer, heart disease, stroke, lung diseases, diabetes, and chronic obstructive pulmonary disease (COPD), which includes emphysema and chronic bronchitis. Smoking also increases risk for tuberculosis, certain eye diseases, and problems of the immune system, including rheumatoid arthritis
Answer:
c. Tabaco use
Explanation:
What is on the left side of the arrow 2H2+1O2 --> 2H2O
Answers
Answer:
The correct answer is - reactants.
Explanation:
In any chemical reaction, there is an arrow that distinguishes the two major components of the chemical equation by placed in between them. These two components are reactants and products.
OftenlThe reactants placed on the left side of a chemical equation and the products placed on the right side of a chemical equation. In this given case, the reactants 2H2 + 1O2 are placed on the left side of the equation.
What is the percent by mass of water in the hydrate CoCl₂ · 6H₂O?
Answers
Answer:
You'll get 52.17%
Explanation:
Question pic
(Will make brainliest)
Answers
Answer:
c
Explanation:
Answer:
a and c
Explanation:
Which two ways the nervous and endocrine systems interact?
Answers
Answer:
Along with the nervous system, the endocrine system coordinates the body's functions to maintain homeostasis during rest and exercise. The nervous and endocrine systems also work together to initiate and control movement, and all the physiological processes movement involves.
Explanation:
The heat to drive Earth's convection cells comes from...
A. the Earth's crust.
B. the Earth's mantle.
C. the Earth's core.
D. the sun.
Answers
Answer:
the sun im not 100% sure but yes
Answer:
B. The Mantle
Explanation:
The mantle is the part of the earth that has convection currents.
Water often has dissolved gases and other chemicals in it. When this water encounters rocks, the minerals in the rocks can be changed by the process of
Answers
El oxígeno y el azufre reaccionan con el cobre para formar óxido de cobre (CuO) y sulfuro de cobre (CuS), respectivamente. ¿Qué cantidad de azufre reacciona con el oxígeno? 1° Cu + O2 =2CuO 2° Cu + S = CuS 3° S + O2 = 2SO
Answers
The given reaction is an example of displacement reaction. Here, one mole of oxygen reacts with one mole of oxygen molecules. Hence theoretically 32 g of sulphur needs 32 g of oxygen.
What is displacement reaction?Displacement reactions are a kind of reactions where one element or group is displaced with other element or group. There are both single displacement and double displacement reaction.
The reaction of sulfur oxide with metallic copper producing copper oxide and copper sulphide is an example of single displacement reaction. The prior reaction for this is the combination of sulfur and oxygen.
Here, one mole of oxygen reacts with one mole of oxygen molecules. Hence theoretically 32 g of sulphur needs 32 g of oxygen. Thus each is reacting in 1 :1 ratio and giving the oxide of sulfur.
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The English translation of your question is as follows:
Oxygen and sulfur react with copper to form copper oxide (CuO) and copper sulfide (CuS), respectively. How much sulfur reacts with oxygen? 1° Cu + O2 =2CuO 2° Cu + S = CuS 3° S + O2 = 2SO
I have no idea what to put, pls help, due tmr
(science)
Answers
Answer:
It traveled for 4 seconds at a distance of about 4.1 meters. With a velocity of 10%.
Explanation:
BRAINLIEST Give examples of at least three critical questions of society that science can help answer.
Answers
Answer:
1. How did life begin?
2. Are we alone in the universe?
3. What makes us human?
