Answer:
Fire
Explanation:
Analyze Between visits 1 and 7, what kind of ecological succession is shown? Explain your answer.
Answer:
Is there supposed to be a picture??
Explanation:
Use Hess’s Law and solve for the enthalpy change of the following rxn:
12 P(s) + 10 Fe2O3 (s) -> 3 P4O10 (s) + 20 Fe (s)
2 C2H6 (l) + 7 O2 (g) -> 4 CO2 (g) + 6H2O (g)
Dang that is messed up you have a EVIL teacher to do that to you
how many moles of each atom in the formula HClO3
Answer:
H has one mole
Cl has one mole
O has three mole
Explanation:
There is a single Hydrogen, thus there is one mole, this also applies to Cl.
With Oxygen, there are three O's, thus there are three moles of Oxygen.
There are 1 mole of H, 1 mole of Cl, and 3 moles of O.
Number of moles in molecules
The number of moles of an atom present in a molecule is classified as the number located in the lower right corner of that atom in the molecule, for example, in the water molecule below:
[tex]H_2O[/tex]
you have 2 moles of hydrogen and 1 mole of oxygen.
Thus, in the HClO3 molecule, there are 1 mol of hydrogen, 1 mol of chlorine and 3 mol of oxygen.
Learn more about mole calculation in: brainly.com/question/2845237
what is the answer?!!?
Plzzzz help
Answer:
The planet would stop
Good luck!
PLEASE HELP ME
How many grams of lithium are needed to produce 45 Og of lithium nitride, according to the following process? 6 Li(s) + N2(g) → 2 Li3N(s)
After conducting SDS-PAGE, you will conduct a staining/destaining procedure, which allows for visual identification of the proteins in your gel. This procedure requires the following staining solution: Coomassie Blue staining solution: 0.1% Coomassie Blue dye (dry powder) in 50% methanol, 10% acetic acid.
Required:
How to make 1 L of this solution?
Answer:
Add 700mL of water.
Explanation:
The technique of separation known as the Sodium Dodecyl Sulfate Poly-Acrylamide Gel Electrophoresis in which its acronym is SDS- PAGE is a very important aspect of Chemistry and Biochemistry as the technique make use of molar mass when it work in seperating proteins.
From the question we have the following parameters or information:
Case 1=> 50% of methanol which is the same as saying 50mL in 100mL of water.
Case 2=> 0.1% Comasse Blue dye (dry powder) which is the same as saying 0.1g in 100mL of water.
Case 3=> 10% acetic acid is the same as saying 10mL in 100mL of water.
Adding the three together, we have ;
50mL in 100mL of water + 0.1g in 100mL of water + 10mL in 100mL of water.
The volume of water in the three = 100 mL + 100mL + 100mL = 300mL.
Therefore, there is need to add 700mL of water to make 1L.
That's 700mL of water + 300mL = 1000mL = 1L
HELP! WILL GIVE BRAINLIEST DUE SOON
Dome Mountains are formed when:
A: plateaus are eroded away
B: faults rub against each other
C: magma escapes from the crust
D: magma pushes up sedimentary rock
Answer:
I am not the best to answer this but I think it would be B
Explanation:
Can someone help me please on this question like quick?
S plus 11r minus fifteen
Answer:
s+11r-15
Explanation:
Classify each of the substances as an atomic element, molecular element, molecular compound, or ionic compound. Provide one sentence explanation for each. a. fluorine b. N2 O c. silver d. K2 O e. Fe2 O3 g
Answer and Explanation:
a. fluorine ⇒ atomic element
Fluorine (F) is a chemical element because it is a pure substance that cannot be decomposed into simpler substances.
b. N₂O ⇒ molecular compound
We can see that N₂O (nitrous oxide) is a molecule composed by two different atomic elements: nitrogen (N) and oxygen (O). Thus, it is a molecular compound.
c. silver ⇒ atomic element
Silver is a chemical element with the symbol Ag. It is a pure substance which cannot be decomposed into simpler substances.
d. K₂O ⇒ ionic compound
Potassium oxide (K₂O) is composed by a metallic element (potassium, K) and a non-metallic element (O). Thus, there is a difference in the electronegativity of the chemical elements, so the substance can dissociate into ions. In consequence, it is an ionic compound.
e. Fe₂O₃ ⇒ molecular compound (with ionic character)
Iron(III) oxide (Fe₂O₃) is composed by iron element (Fe), which is a metal, and oxygen element (O), which is a non-metal. Since it is a Metal- Non-Metal combination, it would be an ionic compound. The difference in electronegativity between Fe and O is not high (<2.0) in comparison with other ionic compounds, so Fe₂O₃ is considered as a polar covalent compound (it is between an ionic compound and a molecular compound).
The electron configuration for Zn2 is [Ar] 3d10 and NOT [Ar] 4s23d8. What experimental evidence has been collected that would allow one to conclude that the [Ar]3d10 is correct
Answer:
Zn2+ is colourless
Explanation:
We know that transition metal salts are usually coloured due to the possibility of d-d transition.
This d-d transition can only occur when there are vacant d-orbitals. The electronic configuration [Ar] 4s23d8 suggests the presence of vacant d-orbitals and the possibility of the compounds of Zn2+ being coloured.
However, the absence of colours in Zn2+ compounds shows that there is no d-d transition(electronic) spectra observed for Zn2+ because the d orbitals are completely filled. This means that the correct electronic configuration of the ion is [Ar] 3d10.
3.0m3 of sulfer dioxide is reacted with 2.0dm3 of oxygen . What volume of sulfur trioxide is form?
Answer:
3.0 dm^3 of sulphur trioxide is formed
Explanation:
From Gay Lussac's law of combining volumes;
The equation is;
SO2(g) + 1/2O2(g) ------> SO3(g)
Reacting volumes 1 vol 1/2 vol 1 vol
Initial volumes 3.0 dm^3 2.0 dm^3 0.0 dm^3
Final volumes 0.00 dm^3 1.5 dm^3 3.0 dm^3
Hence, 3.0 dm^3 of sulphur trioxide is formed.
This is for science! I really need help.
Answer
Solid
liquid
Gas
Explanation:
what happens to ammonia when reacts with heated sodium?
Answer:
When dry ammonia is passed over heated sodium in absence of air, the product formed is sodium amide. - When dry ammonia is passed over heated sodium in absence of air, sodium amide is produced. - Sodium amide aka sodamide is mainly used as a strong base in organic chemistry.
Explanation:
A. The ivy had more genes than the cactus
B. Natural selection choose to kill the cactus
C. The ivy had good genes, but the cactus had bad ones
D. The environmental conditions were right for the ivy but wrong for the cactus
1. Determine the mass of 2.5 mol of AgNO3
Explanation:
1 gram of AGNO3 is 169,87 g/mol
2.5 mole = 2.5×16987
= 42467
(Al = 27.0 g, O = 16.0 g, H = 1.0 g)
2 Al(OH)3 Al2O3 + 3 H2O
how many grams are produced from .85 moles of AI(OH)3
Answer:
Explanation:
21
Fall is usually a little warmer than spring. And yet, the Sun's path is the same in both seasons. Select all that apply.PLEASE ANSWER CORRECTLY I WILL GIVE BRAINLIEST!-THIS IS SCIENCE
Consider the sodium borohydride reduction of camphor to isoborneol. A reaction was performed in which 1.600 g of camphor was reduced by an excess of sodium borohydride to make 1.062 g of isoborneol. Calculate the theoretical yield and percent yield for this reaction. Theoretical yield: g Percent yield:
Answer:
62.5%
Explanation:
Number of moles of camphor reacted= 1.6g/152.23 g/mol = 0.011 moles
Since the reaction is 1:1, then 0.011 moles of isoborenol is also produced.
Theoretical yield of isoborenol produced = 154.25 g/mol * 0.011 moles = 1.698 g
% yield = actual yield/theoretical yield * 100
% yield = 1.062 g/1.698 g * 100
% yield = 62.5%
What is the chemical formula for a molecule of salt?
Answer:
Su fórmula molecular es Na Cl y es el producto de la base hidróxido sódico (NaOH) y ácido clorhídrico, H Cl. En general, las sales son compuestos iónicos que forman cristales. Son generalmente solubles en agua, donde se separan los dos iones. Las sales típicas tienen un punto de fusión alto, baja dureza, y baja compresibilidad.
Explanation:
Amy set up the following experiment to study how plant growth is influenced by weather conditions. mc052-1 One pot will model normal growing conditions, and the other will model drought conditions. Which of the following factors is it most important for Amy to change to model drought conditions?
Answer:
lack of sunlight, overcrowded region for shelter of the plants, no nutrients and water supply, etc.
Explanation:
The plants needs favorable climatic conditions and nutrient to grow. Plants need air, sunlight, water, proper temperature, nutrients, etc. grow and make their food. They make their food with the help of sunlight and carbon dioxide by a process called as photosynthesis.
Now in the context, Amy is setting up an experiment where she will study the growth of plants in two models. One in the normal growing conditions and the other in a drought condition.
Drought is considered the most important abiotic factor that limits the growth and adversely affects the growth and the crop. The factor that is important for Amy to change the model into a drought conditions is the lack of water and carbon dioxide in the atmosphere. Also scarcity of sunlight and nutrients. The drought stress is considered as one of the crop performance limiting factors.
Pls help I’ll mark brainliest
Answer: I will answer if u Mark me
Explanation:
A student says that since the atomic theory is just a theory, it should not be considered useful. Which statement best argues against the student’s opinion?
Scientific theories change over time.
Scientific theories are the results of many experiments and observations.
Scientists often do not agree about specific details of scientific theories.
Scientists often propose competing theories.
Scientific theories do not become Scientific Laws.
Answer:
srry
Explanation:
Answer:
Scientific theories are the results of many experiments and observations.
Explanation:
Sooo BBBBBBBBB
What happens as the activation energy increases?
The pressure of the system decreases.
The kinetic energy of colliding molecules changes.
The reactant surface area decreases.
The reaction begins to slow down.
Answer:
the kinetic energy of colliding molecules changes
Average kinetic energy is the average sum of all kinetic energy of all the molecules of gases. Therefore, the correct option is option B that is the kinetic energy of colliding molecules changes.
What is kinetic energy?It is a energy which is possess by a moving object. It is very difficult to find the correct value of kinetic energy so we find average kinetic energy. Which is very easy to calculate as compared to calculating kinetic energy. It is not dependent on the type of gases or mass of gases.
Mathematically,
K.E=1/2mv²
Where,
m= mass of object
v= velocity of object
As the activation energy increases, the kinetic energy of colliding molecules changes.
Therefore, the correct option is option B that is the kinetic energy of colliding molecules changes.
Learn more about the kinetic energy, here:
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A fifth-grade science class puts half of a white tablet in a test tube with 10 milliliters (mL) of water at 21°C (70°F). The tablet bubbles rapidly for three minutes until it is gone. Students record the final temperature at 20°C (68°F). Which choice best identifies evidence that a chemical reaction occurred?
Answer:
i think it table broke in half
Explanation:
Answer: it would be change in water temperature
Explanation: because the change in the water is the temperature and its is
evaporation
Plz help mee
Sandy soil
A) holds water well
B) contains clay and humus
C) has loose grains and few nutrients
A
think of this way: in Florida and many other costal places, people have sand in their backyards to limit flooding and things due to being so close to the ocean.
4 points 15. The diagram below shows the relative positions of Earth, the moon, and the sun. The moon is shown at four possible positions around Earth. 3 Sunlight Sun Earth mo Which position of the moon could result in a lunar eclipse? В. 2 A B
Answer:
b c
Explanation:
Answer: b c
Explanation: i did test
What is the mass in grams of 5.2 moles of NaCl?
303.89 g
0.09 g
119.6 g
1828
Explanation:
mole=mass/molar mass
mass= mole×molar mass
m= 5.2×( 23+35.5)
m= 5.2×58.5
m= 304.2g
Why is classification important?
Determine the energy released per kilogram of fuel used.
Answer:
what is the energy rate? or how much energy do you have.
Explanation: