Answer:
For example, if a star is moving toward us, its lines will be observed at shorter wavelengths, which is called "blueshifted". If the star is moving away from us, the lines will appear at longer wavelengths, which is called "redshifted".
(please pick as brainlest)
4. Calculate the average atomic mass of lithium, which occurs as two isotopes that
have the following atomic masses and abundances in nature: 6.017 u, 7.30%
and 7.018 u, 92.70%.
Answer:
Average atomic mass = 6.94 amu.
Explanation:
Given data:
Average atomic mass = ?
Atomic mass of first isotope = 6.017 amu
Atomic mas off second isotope = 7.018 amu
Abundance of fist isotope = 7.30%
Abundance of second isotope = 92.70%
Solution:
Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
Average atomic mass = (7.30×6.017)+(92.70×7.018) /100
Average atomic mass = 43.924 + 650.57 / 100
Average atomic mass = 694.494 / 100
Average atomic mass = 6.94 amu.
The average atomic mass is 6.94 amu.
Details required to solve average atomic mass:The Atomic mass of the first isotope = 6.017 amu
Atomic mas off second isotope = 7.018 amu
The abundance of first isotope = 7.30%
The abundance of second isotope = 92.70%
Calculation of average atomic mass:Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
= (7.30×6.017)+(92.70×7.018) /100
= 43.924 + 650.57 / 100
= 694.494 / 100
= 6.94 amu.
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is melting plastic adding energy?
Answer:
Answer: Plastics, in particular, contain mainly carbon and hydrogen, with similar energy content to conventional fuels such as diesel. ... It's possible to convert all plastics directly into useful forms of energy and chemicals for industry, using a process called “cold plasma pyrolysis”.
Explanation:
What’s the answer I don’t know how to do it
Answer:
3.63m/s²
Explanation:
Given parameters:
Mass of box = 8kg
Net force = 29N
Unknown:
Acceleration of the box = ?
Solution:
To solve this problem, we use Newton's second law of motion which is stated as;
Force = mass x acceleration
Acceleration = [tex]\frac{Force }{mass}[/tex] = [tex]\frac{29}{8}[/tex]
Acceleration = 3.63m/s²
What do fossils provide evidence for?
the history of life in the geologic past
why species became extinct in the past
0
developmental patterns of living organisms
the genetic similarities between living and extinct organisms
Answer:
the history of life in the geologic past is the correct answer
Explanation:
If you still need help, the answer is the history of life in the geologic past. I just did this test and got that question correct :) have a nice day!
How many electrons in 23Na+?
How many neutrons in 23Na+?
Answer:
There are 12 neutrons and 11 electrons in 23Na+
Explanation:
An atomic number of 11 means this atom will have 11 protons. A mass number of 23 means 23 - 11 this atom will have 12 neutrons. Since this atom is neutral the positive protons must be equal to the negative electrons. This atom will have 11 electrons.
Which of the following statements about salinity is true?
Question 1 options:
Ocean water near rivers has a lower salinity.
Ocean water near areas with low evaporation has higher salinity.
Ocean water in regions with high levels of precipitation has higher salinity.
Ocean water in areas with high humidity has a higher salinity.
Answer:
the answer is A
Explanation:
I took the test
Salinity of water is the total concentration of the salts present in unit volume of water. Ocean water in regions with high levels of precipitation has higher salinity. Hence option c is correct.
What is salinity ?The salinity of sea water is expressed as a salt (in g) to liter of water ratio. Each liter of sea water contains around 35 grams of dissolved salts. It is spelled 35. The usual range of ocean salinity is 33-37 g/L.
There is a lot of rain in some places of the ocean. Freshwater poured to the surface dilutes the seawater, reduces salinity, and hence makes the seawater less dense. Near land, where rivers provide freshwater, seawater may be less saline.
The seawater near Antarctica has a low salinity of little about 34 ppt, and it is as low as 30 ppt in some spots around the Arctic. Regions where, the precipitation is higher have higher salinity in oceans.
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Based on the graph below, if you chose an alien at random on day 20, what form would it most likely be in?
Alien graph
A. Thin
B. Medium
C. Thick
D. All three are equally probable
Answer:
A. Thin
Explanation:
i took the test a while back yw <3
How many atoms are in 5.00g of carbon
Question 1 options:
3.62 x 1025 atoms C
2.51 x 1023 atoms C
2.51 x 1024 molecules C
3.62x 1023 atoms C
Answer:
2.51 x 1023 atoms C
Explanation:
MW C = 12.011
5g x (1mol/12.011g) =0.416 mol
0.416 mol x (6.022x10^23) = 2.51 x 1023 atoms C
How does thermal energy increase?
Plzzz help
Answer:
B. with more motion of particles within a substance.
Answer:
B. with more motion of particles within a substance.
Hope this helps!
who is the father of genetics
Lena is making a cake to share with her family. She combines the ingredients for the cake, then pours the batter into two pans and bakes the cake for 45 minutes in the oven. What type of change is baking a cake?
Answer:
The cake is rising and cooking
Item 8
School administrators need to revise the emergency exit routes because construction at the school will block one exit for several weeks. They use a floor plan of the school to model the exit route from each room of the school. What is the next step in the process? Choose the correct answer.
Design and test solutions.
Optimize design solutions.
Define and delimit the problem.
Implement and communicate results.
Answer:
this anwer is define and delimit the problem
Explanation:
The qualifications for an emergency exit are as follows: it must be in a location that is easily accessible, the exit must have an area or location that can carry people in in the event of an emergency situation, it must be controlled by people in the building, it must be well managed and regularly maintained, and must be in a permanent location. Usually in a strategic location (for example on a staircase, hallway, or other possible place) opens an exit with a crash bar above it and with an exit sign leading to it. The name is a reference when it is often used, however, the fire exit can also be the main door that must be opened from inside the room. A fire escape is a special type of emergency exit, installed on the exterior of a building.
answer by:---------- clever 002----------#semogamembantu
learning waith brainly
While heating up a 25 gram sample of concrete (specific heat = 0.210-cal/g°C), your initial tempărature is room temperature (25°C), you found that the substance gained 305 calories. What was the final temperature of your sample?
**Round your answer to the nearest 0.1**
I got 83.1 but I just want to check it
Answer:
Final temperature = 83.1 °C
Explanation:
Given data:
Mass of concrete = 25 g
Specific heat capacity = 0.210 cal/g. °C
Initial temperature = 25°C
Calories gain = 305 cal
Final temperature = ?
Solution:
Q = m. c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = T2 - T1
305 cal = 25 g ×0.210 cal/g.°C × T2 - 25°C
305 cal = 5.25cal/°C × T2 - 25°C
305 cal / 5.25cal/°C = T2 - 25°C
58.1 °C = T2 - 25°C
T2 = 58.1 °C + 25°C
T2 = 83.1 °C
- In the reaction 2H2+O2-2H2,0, how many moles of hydrogen are required to fully react with 8
mol of oxygen?
Answer: 12.0 moles
Explanation:
oh no it seems that a few points fell out of my pocket because I have too many, hopefully, no one takes them while I'm not looking.
Answer:
lol thanks
Explanation:
Answer:
Explanation:
thxxxssss
The transfer of nitrogen from the atmosphere to the soil, to living things, and back to the atmosphere is...
a
The water cycle
b
evaporation
c
The Nitrogen Cycle
d
Denitrification
Answer:
c
Explanation:
please give me brainliest
How many km are equal to 1.55 x 104 m?
Answer: 0.1612 kilometers
Explanation:
The mass of the nails and copper sulfate solution used in this investigation was 250g. The mass of the copper and iron sulfate solution produced in this investigation would be blank?????? 250g.
If 35.5 grams of calcium oxide react with excess water, how many grams of calcium
hydroxide can be formed?
CaO + H2O - Ca(OH)2
Mass of Ca(OH)2= 46.916 g
Further explanationGiven
Reaction
CaO + H2O - Ca(OH)2
Required
mass of Ca(OH)2
Solution
Mol of CaO :
= mass : MW
= 35.5 g : 56 g/mol
= 0.634
From the equation , mol ratio CaO : Ca(OH)2 = 1 : 1, so mol Ca(OH)2 = 0.634
Mass Ca(OH)2 :
= mol x MW
= 0.634 x 74
= 46.916 g
volume of 2.93 L, what will its pressure? 0.499 am
3. Hospitals buy 400-L cylinders of oxygen gas compressed at 150 atm. They administer oxygen to
patients at 3.0 atm in a hyperbaric oxygen chamber. What volume of oxygen can a cylinder
supply at this pressure?
?
The volume of Oxygen : 20,000 L
Further explanationGiven
400 L : initial volume
150 atm : initial pressure
3 atm : final pressure
Required
Final volume
Solution
Boyle's Law
At a fixed temperature, the gas volume is inversely proportional to the pressure applied
[tex]\rm p_1V_1=p_2.V_2\\\\\dfrac{p_1}{p_2}=\dfrac{V_2}{V_1}[/tex]
Input the value :
V₂ = (P₁V₁)/P₂
V₂ = 150 atm x 400 L / 3 atm
V₂ = 20,000 L
How many moles are in 2.98 E 28 molecules of water?
The number of moles : n = 4.95 x 10 ²⁴
Further explanationGiven
2.98E28 molecules of water
Required
The number of moles
Solution
The mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
n = N : No
n = 2.98 x 10²⁸ : 6.02.10²³
n = 4.95 x 10 ²⁴
which set of atoms will form an ionic compound
Answer:
The Ionic compound is held by ionic bonding and this ionic bond forms between a metal and a non-metal. Here the calcium atom is the metal and the oxygen atom is a non-metal this set of atoms will form an ionic compound.
5. Before becoming ions, the sodium atom is ( larger / smaller ) than the chlorine atom.
6. Sodium ( gains / loses ) an electron. This gives it a (positive/negative ) charge.
7. Chlorine ( gains / loses ) an electron. This gives it a ( positive / negative ) charge.
Answer:
Larger
Loses, positive
gains, negative
Explanation:
5. Before becoming ions, the sodium atom is larger than the chlorine atom. This is because, generally metals have a greater atomic radius compared to non - metals.
Also, as one moves from left to right across the period, the atomic radius reduces.
Chlorine is to right on the periodic table and Sodium is to the left.
6/7;
When a neutral atom gains electrons, it becomes negatively charged. This is because the number of electrons in the atom becomes more than the number of protons.
This is the case with the sodium. As it loses electrons, it becomes positively charged.
The reverse is the case when chlorine gains electrons to become negatively charged.
A weak current can be detected by replacing an electric bulb in an electric tester with
(a) a coil wound over a compass needle
(b) none of these
(c) LED
(d) Both (a) and (b)
Answer:
I believe it is B
Explanation:
Which statement below correctly describes what changes when moving downwards from fluorine to chlorine on the periodic table?
A. The classification changes from nonmetal to metal
B. The number of valence electrons increases
OC. The number of total electrons increases
D. The ionic charge of the elements changes from positive to negative
In the periodic table, on moving downward, there has been an increase in the total electrons. Thus, option C is correct.
The periodic table has been the arrangement of elements in the increasing order of the atomic number, and similarity in the chemical properties.
Fluorine to Chlorine in the Periodic tableThe fluorine has been the most electronegative element in the periodic table. Fluorine and Chlorine has been nonmetals of group 17. The valence of electrons in the period have been equal.
The total electrons in the table increases with increase in atomic number.
The ionic charge has been the charge possessed by the element in the ionic form. The elements in the same group has been composed of similar equivalent charge.
Thus, in the periodic table, on moving downward there has been an increase in the total electrons. Thus, option C is correct.
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DUE FEB 4th HELP HELP HELP PLEASE HELP
Answer:
1. is atmosphere
2. is air pressure
3. green house gases
4a. nitrogen
4b. oxygen
4c. carbon dioxide
5. stratosphere
6. troposphere
7. Air pressure is higher at lower altitudes. Air density is higher at lower altitudes. There is more space between air molecules at higher altitudes. There is less oxygen to breathe at the top of a high mountain than there is at sea level.
8. exosphere, this is because the air is thin, therefore making it cold
9. Without this barrier in place, all of the radiation would reach Earth, which is very damaging to plants and us.
10. Temperature increases as you gain altitude in the stratosphere and the thermosphere. Temperature decreases as you gain altitude in the troposphere and mesosphere.
11. When the level of greenhouse gases increase, the concentration of gases in the atmosphere would become greater. This event allows the gas molecules to increase in number, As a result, the air temperature increases.
note: 12 and 13 you are going to have to workout for yourself as I have no clue lol-
hope this helps :)
What would be a likely climatic outcome of rising ocean temperatures?
A. Ocean current patterns would be affected
B. The ocean wouldn't be able to store as much additional heat, thereby increasing land surface temperatures
C. Regional and/or global land surface temperatures would also be affected
D. All of the above
What can be determined from a balanced chemical equation
Answer:
The identities of the reactants and the products and the exact number of molecules of each one that is absorbed or generated are given by a balanced chemical equation.
Explanation:
The beginning compound(s)-reactants-on the left and the final compound(s)-products-on the right, divided by an arrow, are shown by a chemical equation.
A balanced chemical equation tell us about the identity of the reactants and the products, number of molecules of each of the reactants and the products that are consumed or produced
An equation is said to be balanced if it has an equal number of each of the elements on the reactant side and product side.
A balanced chemical equation tells us about the identity of the reactants and the products, the number of molecules of each of the reactants, and the products that are consumed or produced
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pls help me with this question its due in 10 minutes.
A bottle of shampoo is shaped like a right cylinder. The cylinder is six inches high with a radius
of 0.9 inches. One cubic inch is the same as 16.4 milliliters. What is the capacity of the bottle in
milliliters? Round to the nearest whole number. Use the following formula to help you decide:
Vegy = 17p• where Vcy is the volume of a right cylinder, ne is about 3.14, ris the radius
of the base, and h is the height of the cylinder
A 250 ml
B 200 ml
C 150 ml
D 100 ml
Answer:
A) 250 ml
Explanation:
Vcyl= π • r2 • h -----> Vcyl= π· 0.9^2 · 6= 15.2681402964464 x 16.4 millimetres = 250.3975008617209 rounded off to 250 millimetres :)