Use the mole concept to calculate the number of atoms that are in a 1.75-mol sample of CHCl3.
Answers
1.75 moles ChCl3 x (6.02 x 10 ^-23) / 1 mole = 1.0535 x 10^-22 atoms.
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SOMEONE HELP ME PLEASEEEE!!!What is the outermost layer of the Earth called?
Measuring Physical Properties Lab ReportInstructions: In the Physical Properties lab, you will test the physical properties of different building materials in order to pick the appropriate materials for a new home in Tiny World. Record your observations and test measurements in the lab report below in the areas shaded in purple. You will submit your completed report to your instructor. Student Name Instructor Date Lab Objectives In this lab you will: • help the aliens, called Tinyians, build the best house on their planet called Tiny World. • experiment with different building materials to collect data to see which ones best meet the criteria for building a home on Tiny World. • test each building material for density, thermal and electrical conductivity, flexibility, and magnetism. Background Research: You will need to gather background research from the virtual lab to form a good hypothesis. Read the Welcome to Tiny World part of the lab. Use the background information you learn to answer the questions below. Describe the gravity of Tiny World. Part 1: Describe the reason your house will need magnets. Describe the climate of Tiny World. Hypothesis: In this section, include the IF/THEN statements you developed during your lab activity. These statements reflect your predicted outcomes for the experiment. A If we use _______ to build the roof of the house, then the temperature inside the house will remain cooler. B If we use_______ to build the walls and floors of the house, then the temperature inside the house will remain cooler. C If we use ______ to bring electricity into the home, then it will allow electricity to flow into the home at a faster rate. D If we use_______ to construct the latches on the windows and doors, then the magnetism will keep the latches secure. Part 2 Procedure: 1. You will test each building material for density, thermal and electrical conductivity, flexibility, and magnetism. 2. Record your observations in the data table provided below. 3. Repeat steps with all test materials. Data: Record the results of each of your physical property tests in the table below. Wood Clay Brick Iron Aluminum Copper Nickel Flexibility (?/10) Magnetism (number of paper clips) Thermal Conductivity (W/(m·K)) Electrical Conductivity (x107 S/m) Mass (g) 10g 10g 10g 10g 10g 10g Volume (cm3) Formula: L x W x H Density (g/cm3) Formula: D=M/V part 3 Conclusion Your conclusion will include a summary of the lab results and an interpretation of the results. Please answer all questions in complete sentences using your own words. 1 Using two to three sentences, summarize what you investigated and observed in this lab. 2 What was the independent variable in the lab? 3 What was the dependent variable in the lab? 4 Did each of your experiment results support, or fail to support your four hypotheses? A. B C. D. 5 Why do you think a building material's density is important when building homes or architectural structures? 6 Why wouldn’t you choose wood or aluminum for the latches on your house? 7 Which material has the highest thermal conductivity? 8 Which material has the highest electrical conductivity 9 Based on your data, explain why these materials have the highest thermal and electrical conductivity? 10 Think about where you live now or where you have lived in the past; use complete sentences to describe this environment and the weather.
To calculate the amount of heat absorbed as a substance melts, which of the following information is NOT needed?a.the mass of the substancec.the change in temperatureb.the specific heat of the substanced.the density of the sample
What measures the mads of an object
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Answer:
The sun is not yellow.
Explanation:
sun can look yellow or red whenever we see the sunlight at sunrise or sunset, when it becomes low on the horizon. That's only how the wavelengths of the low frequency (green , blue, magenta) are dispersed across the planet's crust, just as the tiny waves are distributed along the sea by huge rocks.
Answer:
Its because of the Earth's atmosphere | The sun is a yellow dwarf star | If you saw the sun from space, it would actually look white
Explanation:
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Carbon is the atoms in the ground state can a valence electron beremoved using the least amount of energy. Hence option 3 is correct.
What is valence electron?
Valence electron is defined as the amount of electrons an atom must earn or lose to reach the electrical configuration of the nearby noble gas or inert gas. The quantity of electrons in the outermost energy shells is known as the valence electron number. The location of an element in the periodic table corresponds to how many valence electrons are present in that element.
The least amount of energy might be used to remove the carbon valence electron. Carbon one can observe that carbon has four valence electrons in the ground state electron configuration, two of which are in the 2s subshell and two of which are in the 2p subshell.
Thus, carbon is the atoms in the ground state can a valence electron beremoved using the least amount of energy. Hence option 3 is correct.
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(2) radium-226 (4) thorium-232
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Answer: Option (1) is the correct answer.
Explanation:
- A positron is a small particle which contains a +1 charge and its mass is equal to the mass of an electron, that is,
kg.
A positron is represent by the symbol .
For example,
- Whereas nitrogen-16 does not decay to give a positron because nitrogen-16 is the daughter isotope formed due to decay of oxygen-16.
The decay reaction is as follows.
- And, on radioactive decay of thorium-232 there will be formation of radium-228 along with emission of an alpha particle.
The reaction will be as follows.
Therefore, we can conclude that out of the given options positrons are spontaneously emitted from the nuclei of potassium-37.
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The question is as follows: How many oxygen molecules are produced by the decomposition of 28.5 g of H2O2 (molecular mass = 34.0g / mol) according to the equation
2H2O2 (l) → 2H2O (l) + O2 (g)
Answer: There are molecules are produced by the decomposition of 28.5 g of
according to the equation
.
Explanation:
Given: Mass of = 28.5 g
As moles is the mass of a substance divided by its molar mass. Hence, moles of is calculated as follow.
According to the given equation, 2 moles of gives 1 mole of
. So, moles of
produced by 0.838 moles of
will be calculated as follows.
This means that moles of produced is 0.419 mol.
As per the mole concept, 1 mole of every substance has molecules.
So, molecules of present in 0.419 mole are as follows.
Thus, we can conclude that there are molecules are produced by the decomposition of 28.5 g of
according to the equation
.
b. metals.
c. halogens.
d. noble gases.
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The elements that do not ordinarily form compounds are noble gases as they have complete octet.
What are elements?
An element is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.
Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.
The number of protons in the nucleus is the defining property of an element and is related to the atomic number of the element.All atoms with same atomic number are atoms of same element.
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hope this helps!