Another student suggests putting some cotton wool in the top of the flask.
Suggest why this improves the investigation. *
(1 Point)
Answer:
B proofread the message.
Explanation: Hope this helped
Which statement best describes the characteristics of white light?
A. White light is composed of radiation with a wide range of amplitudes.
B. White light is composed of various wavelengths of light not seen by the naked eye.
C. White light is composed of a spectrum of many different colors.
B. White light is composed of radiation that travels at different speeds producing various colors.
Answer:
i believe its B
What season is it in earths northern hemisphere when earths northern hemisphere tilts toward the sun
Answer:
Summer
Explanation:
Earth's tilted axis causes the seasons. Throughout the year, different parts of Earth receive the Sun's most direct rays. So, when the North Pole tilts toward the Sun, it's summer in the Northern Hemisphere. And when the South Pole tilts toward the Sun, it's winter in the Northern Hemisphere.
Hope it helped!! Please mark as Brainliest!
Answer:
Summer took the test and got it right
Explanation:
Which season will the northern hemisphere experience when the axis of Earth is tilted towards the sun?
Summer
This image models…
diffraction
reflection
refraction
absorption
Answer:
reflection is correct answer by my views
How many moles of iron is needed to react completely with 5.00 moles of sulfur to form iron
Fe + S -->
no
Answer:
5 moles of Fe(II) are required to react completely with the 5 moles of Sulphur
Explanation:
The balanced equation in this question is
Iron + Sulfur = Iron(II) Sulfide
Fe (II) + S --> Fe(II)S
Thus one mole of sulfur reacts with one mole of Fe(II)
Hence, 5 moles of Fe(II) are required to react completely with the 5 moles of Sulphur
Explain the relationship between the number of valence electrons and the reactivity of a metal.
PLEASE HELP ME ILL GIVE BRAINLIEST IF YOU EXPLAIN UR ANSWER
Answer:
they cant relxax or the ball woud not be in your have it would fall bec there is no stranth for your musseles
Explanation:
How are stars and comets different?(2 points)
A star has a solid rock and gas surface, while a comet has tail of dust and gas.
A star has a tall of dust and gas, while a comet has a solid rock surface.
A star is made up of burning gases, while a comet is made up of ice, gases, rocks, and dust.
A star is made up of Ice, rocks, and dust, while a comet is made up of burning gases.
Answer:
A star is made up of burning gases, while a comet is made up of ice, gases, rocks, and dust.
Explanation:
Answer:
Its D "A star is made up of Ice, rocks, and dust, while a comet is made up of burning gases."
Explanation:
A person riding a bike has a mass of 55kg. They are moving with a velocity of 2m/s. What is the Kinetic Energy of the person?
Explanation:
Formula : ½ × mv² (mass×velocity)
½ × 55 × 2²= ½×55×4=110J
(½ is also equivalent to 0.5)
J = Joules
This is the process that cells reproduce and replace old or damaged cells.
Question 5 options:
Mitosis
Meiosis
Ribosomes
Cytokinesis
Describe what happens to the electrons when sodium and chlorine combine to make NaCl.
In order to produce CO2, a student put a sample of calcium carbonate in a flask and added hydrochloric acid using the following equation: Ca(CO3) + HCl → H2O + CO2 + CaCl2 The student finds the mass of CO2 generated to be 100 g. If the student began with 200 g of HCl and there was ample CaCO3 left unreacted, what was the percent yield?
Answer:
82.9% Is the percent yield
Explanation:
First, we need to balance the equation.
Ca(CO3) + 2HCl → H2O + CO2 + CaCl2
Since the problem tells you that the excess reactant is Ca(CO3), we just need to Stoichiometry to solve for the theoretical yield.
[tex]\frac{200g HCl}{1}[/tex] x [tex]\frac{1 mole HCl}{36.46gHCl}[/tex] x [tex]\frac{1 mol CO2}{2molHCl}[/tex] x [tex]\frac{44.01CO2}{1molCO2}[/tex] =120.707 g (theoretical yield)
Take your actual yield of 100g, divide that by 120.707, then multiply that decimical by 100.
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SCIENCE
What is the relationship between a need
in society and a system?
Answer:
The relation between individual and society is very close. Essentially, “society” is the regularities, customs and ground rules of antihuman behavior. These practices are tremendously important to know how humans act and interact with each other. Society does not exist independently without individual.
Explanation:
anyone know this? i’m having trouble...please help.
solution containing more solute than can theoretically dissolve at a given temperature
Answer:
Explanation:correct because the chlorine can make it change so the soulation is dissloving
A typical tincture of iodine contains about 2.0% iodine by mass. Calculate
the mass of iodine in a 500. g tincture.
A weather foreshows 35 m/h on the weather map. Which weather component does this number represent
Answer:
this is the minutes and hours this is representing
Why isn't there a lunar eclipse every time Earth is in between the sun and
the Moon?
There is no lunar eclipse every time Earth is in between the sun and
the Moon as a result of the orbit of the moon being tilted relative to the
orbit of the Earth around the sun.
What is Lunar eclipse?This is a phenomenon which occurs when the Sun, Earth, and Moon are
closely aligned with Earth being between the other two bodies.
The orbit being tilted ensures that the moon often passes below or above
Earth which is the main reason why lunar eclipse doesn't occur all the time
and makes it most appropriate.
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The average American produces about four pounds of waste each day. What
is one way to reduce the amount of waste you produce?
A. Pack your lunch in a reusable container each day.
B. Place broken electronics in the garbage can
C. Use disposable dishes and cutlery at parties.
D. Bag yard waste each time you mow or prune
Answer:
A.pack your lunch in a reusable container each day
Explanation:
done!!!mark me the brainliest
Please help me!!!!! I REALLY NEED HELP!!! What is my carbon footprint and how can I reduce it?
Answer:
your carbon footprint is how often you use a car of vehical you can decreese it by riding a bike or walking.
Explanation:
Carbon footprint is like when you ride a car and it produces lots of carbon monoxide in the air. Ways to reduce it is by walking, riding a bicycle or using the bus for transportation. Hope this helps.
True or False: The octet rule states that an atom will gain or lose electrons to achieve a
stable valence electron configuration.
Answer:
they will tend to do that yes
Explanation:
PLEASE HELP ME!!!
which stage takes place before the one in the diagram above?
A. metaphase 1
B. metaphase 2
C. telophase 1
D. telophase 2
Answer:
C. telophase 1
Answer:
metaphase 2
Explanation:
URGENT PLS HELP!!!!!
What charge would you expect on an ion from group 2A, such as magnesium (Mg) or
barium (Ba)?
Answer:
+2
Explanation:
Elements in group 2A have 2 valence electrons in their outer shell, so when they bond with other atoms, they are most likely to give away these 2 electrons. With 2 electrons gone, the ion will have a positive charge (since there are now more protons than electrons in the atom).
The students in Miss Washburn’s class use different methods to conduct investigations. Which of the following is an example of an experiment?
Answer:
B
Explanation:
Got it right
Change 60. miles/hour to km/min?
Ammonia (NH3) reacts with oxygen (O2) to produce water and nitric oxide (NO). How many grams of water are produced when 22.5 grams of oxygen are reacted?
what is the primary pigment found in the chlotopast
Answer: Chlorophyll is a green photosynthetic pigment found in plants, algae, and cyanobacteria.
Chlorophyll absorbs mostly in the blue and to a lesser extent red portions of the electromagnetic spectrum, hence its intense green color.
Green substance in producers that traps light energy from the sun, which is then used to combine carbon dioxide and water into sugars in the process of photosynthesis Chlorophyll is vital for photosynthesis, which helps plants get energy from light.
Chlorophyll molecules are specifically arranged in and around pigment protein complexes called photosystems, which are embedded in the thylakoid membranes of chloroplasts.
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Read the hypotheses below, then answer the questions.
A student wonders if adding fertilizer to the soil will make tulips grow faster. The student’s hypothesis states, “If fertilizer is added to the soil, then the tulips will grow faster, because fertilizer adds nutrients to the soil.” Which of the following variables is the independent variable?
the type of soil the tulips receive – with or without fertilizer
the time it takes the tulips to grow
Answer:
A
Explanation:
the type of soil the tulips receive_ with or without fertilizers
Consider the following reaction:
Cl2 + Na2S -> 2NaCl + S
The percent yield of sulfur when 71.0 g of Cl2 is reacted in excess Na2S solution is 73.0 %.
What is the actual mass of sulfur yielded by this reaction?
(Molar mass of S = 32.1 g/mol, molar mass of Cl2 = 71.0 g/mol)
__ g
Answer:
23.4
Explanation:
23.4 g mass of sulfur yielded by this reaction.
[tex]Percentage yield = (Actual / Theoretical)\times 100[/tex]
The theoretical yield for S is as follows:-
[tex]71.0\ gCl_2\times\frac{1\ molCl_2}{71\ g Cl} \times\frac{1}{1} \ mol\times\frac{32.1\ g}{molS} =32.1\ gS[/tex]
Actual yield=[tex]32.1\ gS\times73\%=23.4\ g\ S[/tex]
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what is the chemical formula of tetraselenium tetranitride?
Answer:
Tetraselenium tetranitride
Common Name Tetraselenium tetranitride
CAS Number 12033-88-4 Molecular Weight
Density N/A Boiling Point
Molecular Formula Se4N4 Melting Point
MSDS N/A Flash Point
Chemical formulas are the representation of the chemical elements with their symbols. The chemical formula for the tetraselenium tetranitride compound is S₄N₄.
What is a chemical formula?
A chemical formula is the representation of the chemical molecule and compound by their symbols and the number of the constituent in the structure. It is represented by the use of the chemical symbol, numbers in superscript and subscript, parentheses, and signs like - and +.
The chemical formula for the tetraselenium tetranitride compound must contain the element symbol of selenium (S) and nitride (N). There are four numbers of both the elements and hence can be represented by, S₄N₄.
Therefore, S₄N₄ is the chemical formula for tetraselenium tetranitride.
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