Answer:
Electrons are the smallest of the particles that make up an atom, and they carry a negative charge. The number of protons and electrons is equal in a neutral atom. The hydrogen atom, for example, has just one electron and one proton. The uranium atom, on the other hand, has 92 protons, and therefore, 92 electrons.
If you avoid doing a bronsted acid-base reaction initially, there is only one reaction sequence which uses all 4 reagents/conditions that will lead to an alkyne product starting from the ethyl benzene as your organic reactant.
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Some pure calcium carbonate is made to react completely with 100cm3 Hydrochloric acid of unknown concentration. 120cm3 of carbon dioxide was formed at Room temperature. calculate the number of moles of carbon dioxide formed at room temperature
Answer:
Explanation:
as we know that 1dm3 =1000cm3
therefore x dm3 =120 cm3
1000X =1*120
X dm3 =120/1000=0.12
so 120 cm3 =0.12 dm3
now the number of moles of carbon dioxide at RTP is
moles =given volume(dm3)/standard volume at RTP
moles=0.12dm3/24
moles =5*10^-3
An object is found to have a mass of 54.3 g. Find the object’s density, if its volume is 47.18 cm3
Answer:
d≈ 1.15 g/cm^3
Explanation:
The density of an object can be found by dividing the mass over the volume.
d= m/v
The mass of the object is 54.3 grams and the volume is 47.18 cubic centimeters.
m= 54.3 g
v= 47.18 cm^3
Substitute the values into the formula.
d= 54.3 g/ 47.18 cm
Divide.
d= 1.150911403136922 g/cm^3
Let’s round to the nearest hundredth. The 0 in the thousandth place tells us to leave the 5 in the hundredth place.
d ≈ 1.15 g/cm^3
The density is about 1.15 grams per cubic centimeter.
How do the process of crabon cycle contribute to climate change.
Explanation:
Carbon that is a part of rocks and fossil fuels like oil, coal, and natural gas may be held away from the rest of the carbon cycle for a long time. These changes add more greenhouse gases in our atmosphere and this causes climate change.
what is chemistry? please tell me
Chemistry is the scientific discipline involved with elements and compounds composed of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during a reaction with other substances.
Can someone help me plzz
Answer: it’s 8
Explanation:
Area is length x width, so you would multiply the 4 by the 2. Or as it says in the question count the squares inside the rectangle. Most of the time, however, you would multiply length x width.
3.490 x 10^-3 + 1.100 x 10^-2 in scientific notation
Answer:36
Explanation:
How many sif figs does the number 93500 have?
Answer:
The number has 3 significant figures.
Answer:
It has approximatly 3
Explanation:
The Significant figures would be 9, 3 and 5!
Yasir wants to determine if there is a relationship between room color and sleep. Based on his research, Yasir makes an educated guess that people fall asleep more quickly in a room painted blue than in a room painted yellow. He asks several people which color they like better—yellow or blue—and uses their responses to determine if his educated guess was correct. What is missing from Yasir's scientific investigation? A. testable hypothesis based on research B. experiment that tests the hypothesis C. variables to be tested by an experiment D. research on the topic to see what others have learned
Answer:
B). An Experiment that tests the hypothesis.
Explanation:
The element that is missing from Yasir's scientific investigation is 'an experiment which tests a hypothesis.' His experiment does not provide a verifiable statement revealing his proposition or prediction regarding the possible outcome of the experiment which could be verified by using a research or investigation. He rather tests his proposition indirectly by asking 'which color they like better' and using it to make an educated guess. Thus, option B is the correct answer.
Define monocarboxlic acid
Answer:
When a molecule has just has one carboxylic acid group, it is defined as a monocarboxylic acid.
Explanation:
hope it will help ^_^
Explain why current flowing indicates the presence of ions
Explanation:
An electron current, the flow of electrons, contributes to an electric current since the electron 'carries' negative electric charge. ... The flow of ions (either positively or negatively charged) also contributes to an electric current in, for example, the electrolyte of an electrochemical cell.
hope it will work well?!
The flow of electric charge across two points is referred to it as an electric current. Electron pairs warm circuits in light lamps and electrical furnaces and generate magnetic fields in motors, inductors, and generators, and further calculation can be defined as follows:
The passage of electrical charges is alluded to as an electric charge. Therefore, an electric current is a characteristic that must be 'carrying' by a charge transfer, not an entity. Since electrons 'carry' negative electrical charges, electrons contribute to an electric current. In the electrolyte of the electrolytic system, for instance, the flow of ions leads to an electric charge. Learn more:brainly.com/question/790768
How to convert 435 millimeters into kilometers
Answer:
0.000435 kilometers
Explanation:
You divide the length of the value by divide the length value by 1e+6
i need help on a CER
Answer:
Certified Emission Reductions (CERs) are a type of emissions unit (or carbon credits) issued by the Clean Development Mechanism (CDM) Executive Board for emission reductions achieved by CDM projects and verified by a DOE (Designated Operational Entity) under the rules of the Kyoto Protocol.
Answer:
A CER(S) stands for Claim, Evidence, Reasoning, (Science).
Explanation:
What is CER(S)?
The 1st part of CER(S) is a CLAIM. A claim is a simple, single sentence that answers a question. Your claim is a statement about what you believe to be true about that question. Your claim must be accurate, clear, and exact. Your claim should be the first sentence in your explanation. Your claim should ONLY answer the question – do not explain your answer at this point.
The 2nd part of CER(S) is EVIDENCE. The Evidence consists of data and/or results that can be used to support the claim. Evidence must be explicitly stated in sentence form and cannot merely be referenced. To adequately support a claim, the evidence must be appropriate (relevant to the question) and sufficient (enough provided to be convincing).
The 3rd part of CER(S) is the REASONING. The reasoning ties the evidence to the claim and explains why the evidence supports your claim. In this section, you discuss why the evidence that you provided is important and relevant to your claim.
The 4th and final part of CER(S) is the SCIENCE. Your teacher may not ask you to provide the supporting science for every CER(S) question – that is why the S is in parentheses. If you are asked to provide the science that supports your claim, then you need to discuss the relevant science and how it supports your claim.
Example of a CER(S)
Question: Use CERS to address the following question. “How does the length of a string affect the swing of a pendulum?”
Claim: As the length of the string increases, the time needed for a pendulum to make one complete swing increases.
Evidence: The time necessary for a pendulum to make one complete swing (back-and-forth) increases as the length of the string increases. When the string was 0.25 m the pendulum made a complete swing in 1.00 seconds. At each increase in length, there was a subsequent increase in time. When the string was 0.50 m the swing time was 1.42 seconds, at 0.75 m the time was 1.74 seconds, and at 1.00 m the time was 2.00 seconds.
Reasoning: My evidence supports my claim because it shows a clear direct relationship between the length of string and the time it takes for a pendulum to make one complete swing. There is a consistent increase in time as the length is increased, with no exceptions in our data. If our data are graphed, there is a distinct positive linear relationship between the variables with a slope of 1.33 sec/m. This slope indicates that for every additional meter of a string the time for one swing should increase by 1.33 seconds. This linear relationship should allow us to predict the swing time for any length of the string. This prediction could be tested, and if confirmed it would further support our claim.
Science: Our results make sense and would be expected based on Newton’s Law of Gravity and the concept of speed. According to the law of gravity, all objects fall at the same speed regardless of their masses. A swinging pendulum is essentially an object falling while attached to a string, so all pendula should fall at the same speed. The string of the pendulum causes the object to fall through an arc of a circle with the string serving as its radius. A longer string will have a longer radius, causing the object to swing through a larger arc. Objects moving at the same speed will cover the same distance at the same time but will require a longer time to travel a further distance. Since the pendulum with longer string swings through a longer arc it should take longer for it to make one complete swing. This relationship is exactly what we found in our results.
Which of the following liquids is most volatile? Select one: a. cooking oil b. motor oil c. alcohol d. water
Answer:
Alcohol.
Explanation:
It has the lowest boiling point and high vapour pressure.
2
In order for a space shuttle to be launched from Earth into space, rocket forces must be
A.
kept to zero during the launch.
B. less than the gravitational force.
C. equal to the gravitational force.
D. greater than the gravitational force.
Answer:
D
Explanation:
I think it is D. Think about it- if a human jumps, they are less than the gravitational force. But, if you are greater than the gravitational force, I think you will go into space.
which gas present in air has the highest boiling point
How many Significant Figures does 105.60 have? *
Answer:
5 significant figures
Explanation:
What would immediately be used if your clothing caught fire or if a large chemical spill had occurred on your clothing
Answer:
Safety Shower
Explanation:
A safety shower may be defined as it is a unit that is to be made-up to wash the body and head of a person that has come into contact with hazardous chemicals. A good number of quantities of water that is to be for the use and certain apparel that has been infected with dangerous chemicals that may need to be taken off by a person.
Therefore from the above explanation and according to the situation, the correct answer is Safety shower.
Question 16 (2 points)
A scientist studies a model of a widely accepted theory about the position of planets and sun. The model would most likely help the scientist to
(2 points)
O a
prove that the theory would not change in the future
Ob
demonstrate how the theory can be changed into a law
Ос
understand facts which cannot be easily observed
Od
prove that all other facts about the universe are incorrect
Answer:
C I’m sure
Explanation:
A proposed explanation that is based on observations and that can be tested (but hasn't been tested yet) is known as a(n)
Answer: I think its a hypothesis.
How to prepare R-SH from R-Cl? Show reaction.
Answer:
Alkylation reaction help in formation of thiol R-SH
Explanation:Say lets take sodium hydrosulfide (NaSH) and alkyl chloride (R-Cl)/ any acid like chloroaceic acid or choloro or potassim acetates.
R-Cl + NaSH --> R-SH + NaCl
Such reactions are seen in the production of paper from wood pulp and in the production of organic compounds like thioglycolic acids (TGA)
A 210 gram piece of metal has a volume of 81 cm3. What is the density of this metal?
Question 15 options:
129 g/cm3
2.59 g/cm3
0.39 g/cm3
17,010 g/cm3
291 g/cm3
Answer:
The answer is
[tex]2.59 \: \: g / {cm}^{3} [/tex]Explanation:
The density of an object can be found by using the formula
[tex]Density( \rho) = \frac{mass}{volume} [/tex]From the question
mass of metal = 210 g
volume = 81 cm³
Substitute the values into the above formula and solve for the density
That's
[tex]Density = \frac{210}{81} \\ = \frac{70}{27} [/tex]= 2.592592
We have the final answer as
Density = 2.59 g/cm³Hope this helps you
9. How many significant figures are there in the number 0.0001372?
A) 7
B) 3
C) 8
D) 4
E) 0
Answer: D. 4
Explanation:
For numbers with decimal point, we should start counting from the first number that non-zero from the left.
0.0001372
We start counting from 1, since it is the first non-zero number
1, 3, 7, 2
There are in total 4 significant figures
Hope this helps!! :)
Please let me know if you have any question or need further explanation
what is conditional reflexes??
Answer:
Actions that you have trained yourself to perform.
they are obtained by experience. they are not passed from generation. they can be learnt or abolished. Higher center's of brain is responsible for conditional reflexes
Explanation:
example riding a bike, swimming, typing
An element has 7 protons 7 neutrons and 10 electrons what is the mass number
Answer:A B
How many electrons are there in Florine with a -1 charge? 10
What is the total number of nucleons in helium? 4
What is the mass number of an element if it contains 19 protons, 19 electrons, and 20 protons? 39
What is the atomic number of an element with 7 protons, 10 electrons, and 7 neutrons? 7
Explanation: Credit to GOOGLE
You are unsure of the volume of a substance, but you know that it has a density of 4 g/ml and a mass of 16 grams. What is its volume?
Answer:
4 mL
Explanation:
Use the density formula, d = m/v
Plug in the density and mass to solve for v:
4 = 16/v
4v = 16
v = 4
So, the volume is 4 mL
Student perfotms a Benedict's test on an unknown substance. He adds reagent(the chemical required to make a color change), and nothing happens. What can you conclude?
Answer:
Reducing sugars are absent
Explanation:
Benedict's solution is an substance used in testing sugars. It is mixture of sodium carbonate, sodium citrate and copper(II) sulfate pentahydrate. It can be used instead of Fehling's solution in testing for the presence of reducing sugars.
Reducing sugars contain the -CHO group. If there is no colour change after the addition of Benedict's solution, then we can conclude that reducing sugars are absent.
100 POINTS Which observation indicates that the kinetic-molecular theory has limited use for describing a certain gas? Gas particles are acting like tiny, solid spheres. Gas particles are obeying Newton’s laws of motion. Increasing pressure is reducing the volume of the gas. Increasing collisions of gas molecules will increase energy between them.
Gas particles are acting like tiny, solid spheres according to the question. This is option A
What is the observation?According to the kinetic-molecular theory, gases are made up of atoms or molecules that are always moving randomly and independently from one another. According to the hypothesis, gas particles don't have a strong attraction to one another and take up very little space in relation to the overall volume of the gas.
However, it shows that the gas particles are not operating in accordance with the kinetic-molecular theory's presumptions if they behave like tiny, solid spheres.
Learn more about kinetic theory:https://brainly.com/question/15357425
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Nitrogen dioxide undergoes thermal decomposition according to the second-order reaction 2 NO2(g) 2 NO(g) + O2(g). When 0.500 M NO2 is allowed to react for 90.0 seconds, its concentration falls to 0.0196 M. What is the half-life of the reaction when [NO2]0 = 0.500 M?
Answer:
half-life is 3.67s
Explanation:
The general law of the second-order reaction is:
[tex]\frac{1}{[A]}=\frac{1}{[A]_0}+kt[/tex]
As after 90.0s, the concentration of NO2 decreases from 0.500M to 0.0196M:
[tex]\frac{1}{[0.0196]}=\frac{1}{[0.500]}+k*90.0s[/tex]
49.02M⁻¹ = K*90.0s
0.5447M⁻¹s⁻¹ = K
Now, half-life, t1/2 is:
[tex]t_{1/2}=\frac{1}{K[A]_0}[/tex]
Half-life is:
t(1/2) = 1 / (0.5447M⁻¹s⁻¹*0.500M)
half-life is 3.67sYou find an unknown substance, which has a density of 10.0 g/ml, and occupies a volume of 80.0 ml. What is the mass of the unknown?
Answer:
Density=mass / volume.
10= mass /80.
mass=10×80.
=800g