Answer:
The biodiversity of an area is literally the number of species, both plant and animal, inhabiting the environment being examined. When a species is no longer found in a region, it is locally extinct.
Explanation:
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?
Describe what happens to the electrons when sodium and chlorine combine to make NaCl.
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
Some seawater is evaporated. The sea salt obtained is found
to be 86% sodium chloride. How much sodium chloride
could be obtained from 200 g of this salt?
Answer:
the answer is 172g
Explanation:
200 × 0.86 = 172g
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
A cup of coffee is made in the morning by pouring water ov er ground up coffee beans in a piece of paper and by collecting the brown liquid that comes through. Which techniques used
Answer: Filtration technique
Explanation:
The technique used here is called filtration.
Filtration,is a physical separation process that separates a mixture of an insoluble solid from a liquid ( acting as the solvent) by the use of a filter barrier that allows only the fluid to pass through.
In the case from the question,
As water is poured over the ground coffee, it forms a mixture of which the insoluble solid is the coffee grounds, the water is the liquid and the filter barrier is the piece of paper which allows only the brown liquid coffee to pass through as the filtrate.
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.
Request: It would really help if you could make me brainliest
When two objects with neutral charges are brought together, the objects
a. attract each other
b. repel each other
c. all of the above
d. none of the above
Answer:
a. attract each other
Explanation:
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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total number of atoms in 4so2
Answer:
10
s=8
o=2
Hope it helps to
Na2S + HCl NaCl + H2S NaCl Na + Cl2 Na2S + HCl NaCl + H2S balancing chemical equation
Answer:
Na2S + 2HCl -------------------> 2NaCl + H2S.
2NaCl --------------------------> 2Na + Cl2
Na2S + 2HCl ---------------> 2NaCl + H2S
Explanation:
Stoichiometry Is one of important aspect of Chemistry that will be taught to student learning chemistry. It shows the relationship between the reactants and the product. For instance, the amount a reactant reacts to form the products and the amount of products formed.
The balanced chemical reaction for the equation of reaction given in the question is given below;
Na2S + 2HCl -------------------> 2NaCl + H2S.
One mole of Na2S reacts with 2 Moles of HCl to produce 2 moles of NaCl and one mole of H2S.
2NaCl --------------------------> 2Na + Cl2
Two moles of NaCl breaks down into 2 moles of Sodium(solid) and one mole of Chlorine.
Na2S + 2HCl ---------------> 2NaCl + H2S
One mole of N2S reacts with 2 moles of HCl to produce 2 moles of NaCl and one mole of H2S.
With reference to He-4 (or the diagram), explain the term isotopes.
Answer:
Isotopes are basically atoms of an element that have an unequal number of neutrons and protons. Of course the proton number remains the same, but the neutron number either decreases or increases, which leads to an overall change in mass. However, no chemical properties of the atom/element are changed as the electrons are the same number and do not react. In regards to Helium 4, the original number of neutrons in Helium is 2, and protons 2 as well. We see an equal number of neutrons and protons, hence an unchanged mass, and the element is not an isotope.
This is the process that cells reproduce and replace old or damaged cells.
Question 5 options:
Mitosis
Meiosis
Ribosomes
Cytokinesis
Thomas sits half way down a grassy slope. What force stopped him slamming down
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
Change 60. miles/hour to km/min?
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.
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
anyone know this? i’m having trouble...please help.
Calculate the amount of work done in lifting a heavy load of 50kg up to the height of 3m?
amount of work done is equal to l/h
so 50/3=16.66667
round your ans to 2 significant figure
so your ans will be 17m/kg
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.
Which element would form a Covalent (Molecular) bond with Carbon (C) ?
a. 5 Tellurium (Te) b. 9 Nitrogen (N) c. Neither
Name of this molecule: ________________________________________
3. Which element would form a Covalent (Molecular) bond with Chlorine (Cl) ?
a. 3 Calcium (Ca) b. 7 Sulfur (S) c. Neither
Name of this molecule: ________________________________________
4. Which element would form a Covalent (Molecular) bond with Xenon (Xe)?
a. 8 Francium (Fr) b. 1 Hydrogen (H) c. Neither
Name of this molecule: ________________________________________
5. Which element would form a Covalent (Molecular) bond with Hydrogen (H)?
a. 7 Fluorine (F) b. 8 Argon (Ar) c. Neither
Name of this molecule: ________________________________________
first one: nitrogen
ammonia (NH3)
//
3. sulfur
sulfur dichloride (SCl2)
//
4. neither (xenon is a noble gas)
//
5. fluorine
hydrogen monoflouride (HF)
//
I'm not too confident with my naming skills but the chemical formula should be right.
A typical tincture of iodine contains about 2.0% iodine by mass. Calculate
the mass of iodine in a 500. g tincture.
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
Explain the relationship between the number of valence electrons and the reactivity of a metal.
How many atoms of cobalt are in 4 moles of cobalt?
2 × 10²⁴ atoms Co
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
4 mol Co (Cobalt)
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
Set up: [tex]\displaystyle 4 \ mol \ Co(\frac{6.022 \cdot 10^{23} \ atoms \ Co}{1 \ mol \ Co})[/tex]Multiply/Divide: [tex]\displaystyle 2.4088 \cdot 10^{24} \ atoms \ Co[/tex]Step 4: Check
Follow sig fig rules and round. We are given 1 sig fig.
2.4088 × 10²⁴ atoms Co ≈ 2 × 10²⁴ atoms Co
This image models…
diffraction
reflection
refraction
absorption
Answer:
reflection is correct answer by my views
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
can someone help me with all of those pls!!!!
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: