I NEED HELP!!!!Which group contains elements that are most likely to have similar properties?
A. lithium, beryllium, and boron
B. nitrogen, arsenic, and antimony
C. potassium, calcium, and gallium
D. cesium, platinum, and radon
Answers
Answer: The correct answer is option B.
Explanation:
Elements which lie in the same group most likely have similar chemical properties.
From the given options:
Option 1: Lithium, beryllium and boron.
Lithium lies in Group 1, Beryllium in group 2 and boron in Group 13. As, these elements do not lie in the same group and hence, the properties of these elements will not be the same.
Option 2: Nitrogen, arsenic and antimony
All these elements lie in Group 15 of the periodic table and hence will have the same properties.
Option 3: Potassium, calcium and Gallium
Potassium lies in Group 1, Calcium in group 2 and Gallium in Group 13. As, these elements do not lie in the same group and hence, the properties of these elements will not be the same.
Option 4: Cesium, Platinum and Radon.
Cesium lies in Group 1, Platinum in group 10 and Radon in Group 18. As, these elements do not lie in the same group and hence, the properties of these elements will not be the same.
Therefore, the correct option is Option B.
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What element was used to make the first atomic bomb
A chemist dissolves an unknown solute into 1000 grams of water and then measures the freezing point to be -2.88 C what can be determined from this data and from known constants for water?
0.500dkg = ?g HELP PLS!!!!
Answers
The best name for the compound is DINITROGEN TRIOXIDE.
Each chemical compound is always represented by a chemical symbol, which shows the ratio at which each atom of the elements of the compound are combine together and this is often used in naming the compound. Looking at the compound given in the question, the compound is made up of two atoms of nitrogen and three atoms of oxygen and this fact was used in naming the compound. In naming chemical compounds, 'Di' stands for 2 while 'Tri' stands for 3. Since there are two nitrogen and three oxygen atoms in the compound, that was why it was named dinitrogen trioxide.
B) 4 moles
C) 8 moles
D) 16 moles
Answers
2 moles H₂O₂ ------> 2 moles O₂
8 moles H₂O₂ ------> ?
moles O₂ = 8 x 2 / 2
moles O₂ = 16 / 2
= 8 moles
Answer C
hope this helps!
the conclusion
the statement the writer attempts to prove
Answers
You and your team work at Southern Nevada Water Authority and have been given the job of managing fluoride levels for the municipal water system. Today, you will need to measure the mass of the mineral sample fluorite (chemically, CaF2). Use this sample to determine how much water must be added to yield a 1 ppm fluoride solution. Your supervisor is requesting tanker trucks to bring the excess water. He needs to know how many tanker trucks to request and the total cost.
Notes: 1 mol CaF2 = 78.08 g CaF2 = 6.02 x 1023 molecules of CaF2
1 molecules of CaF2 = 2 atoms of F
1 mol H2O = 18 g H2O Density of water is 1 g/mL
1000 mL = 1 L and 3.78 L = 1 gallon
mass of sample of CaF2 = 287.185 g
1 part per million = 1 atom of fluorine per 999,999 water molecules.
1 truck can carry 12,800 litters of water at a cost of $2,852.42 dollars.
Before you begin mixing a solution of fluorite and water your team must first calculate the amount of water you will need. Your team will create a presentation that will show all of the necessary calculations to ensure that the greater Las Vegas area will have cavity free teeth. The presentation should include the following information:
- Draw a diagram that points out the basic design of the water system and transport.
- Demonstrate the following calculations
(a) Calculate how many moles of mineral fluorite (CaF2) are in you sample.
(b) Calculate the number of fluorine atoms in the sample of the mineral fluorite (CaF2).
(b) Calculate how many molecules of water you will need.
(c) Calculate the number of gallons of water that are needed to dissolve a 287.185 gram sample of fluorite to yield 1ppm solution.
(e) How many trucks will be needed? Show your calculations!
(f) what is will be the total cost?
- Bonus points for creativity or “WOW” factor (i.e. pictures, color, neatness)!
Answers
ill try to help
I AGREE WITH bmstanley19
Answers
Answer: Option (e) is the correct answer.
Explanation:
A device which consists of a sealed metal container and it is immersed in an insulated sealed container which is filled with water used to calculate heat of combustion of a reaction.
Volume remains constant in a bomb calorimeter. Basically, a bomb calorimeter measures the changes occurring in the internal energy because of a chemical reaction.
Thus, we can conclude that a bomb calorimeter measures for combustion reactions.
A bomb calorimeter measures ΔE for combustion reactions. Thus, option E is correct.
A device which consists of a sealed metal container and it is immersed in an insulated sealed container which is filled with water used to calculate heat of combustion of a reaction.
Volume remains constant in a bomb calorimeter. Basically, a bomb calorimeter measures the changes occurring in the internal energy because of a chemical reaction.
Thus, we can conclude that a bomb calorimeter measures for combustion reactions.
Learn more about reaction on:
#SPJ6
The options are
measures ΔE for aqueous reactions
measures ΔH for oxidation solutions
measures ΔH for hydrolysis solutions
measures ΔT for hydrolysis solutions
measures ΔE for combustion reactions