Answer:
Exothermic
Explanation:
Combustion reactions are almost always exothermic because it is an oxidation reaction that produces heat and in this case it would be considered to be exothermic but there are few cases in which it would be considered endothermic. Combustion of Nitrogen is endothermic because Δ is positive despite being a combustion reaction.
why can't plants photosynthesise in winter and drought
Answer:
Because there is no water and they restore their food.
Explanation:
Like their glucose and that's why they also the leaf changes color
Please help! Its due now!
Answer:
PARTICLES!
I hope I was on time! Cheers! :^)
Samantha is investigating the densities of several liquids. Which action is the result of her creative thinking ?
Answer:
A. Poe
Explanation:
pagmali sorry na Lang
1. A substance which takes the shape and volume of its container is a?
Solid
Liquid
Gas
Crystal
Answer:
Liquid
Explanation:
Liquid
Answer:
Gas
Explanation:
Gas takes the shape and volume of its container because it doesn't have a definite shape or volume.
Liquid is wrong because it takes the shape of its container, but has a definite volume.
Gas is wrong because it has a definite shape and volume.
Crystal is definitely wrong.
There are no transition elements between the Group 2 element magnesium and the
Group 3 element aluminium.
Give a reason why, in terms of electronic structure.
Answer:
Atomic orbital energy ordering.
Explanation:
The transition metals constitute the d-block. The answer to your question has to do with the energy ordering of atomic orbitals. Specifically, the 3s orbitals are lower in energy than 3p, which are lower in energy than 4s, which are lower in energy than 3d (remember the principal quantum number for d orbitals is one minus the principle quantum number of the shell so n = 4 level's d orbitals are the 3d orbitals). According to the Aufbau principle, atomic orbitals are filled with electrons from the lowest energy up. So the orbitals would have to be filled in the order of 3s, 3p, 4s, and then 3d. Magnesium has its last valence electron residing in the 3s orbital and Aluminum has its last valence electron residing in the first 3p orbital (specifically the 3px orbital, which is aligned horizontally in the 3d plane. The three p orbitals for all principle quantum levels are px, py, pz, with the x, y, z describing the orientation in the 3d plane). The 3d has not yet been reached in terms of energy ordering. This is why there are no transition elements between magnesium and aluminum, in terms of electronic structure.
Which two statements are true for both compounds and mixtures?
A. They are made up of more than one type of atom.
B. Their particles all have the same chemical formula.
O C. They can be separated into two or more elements.
D. Their particles are held together by chemical bonds.
Answer:
B and C is your best option
BRAINLIST ???
The secondary structures shown in the protein are Question 12 options: A) α-helices and ß-pleated sheets. B) ß-pleated sheets. C) globular structures. D) α-helices.
Answer:
A. a- helixes and B-pleated sheats
Explanation:
A helical (a-helix) or flattened sheets (B-pleated sheet) like structures are established between opposite charge bearing groups of different amino acids are called Secondary Structures.
what is meant by pure substance????
Elige la respuesta que mejor describe cómo difieren el Monte Everest y el Valle de la Muerte.
El Monte Everest es plano y el Valle de la Muerte es el punto más alto de la Tierra.
O El Monte Everest es el punto más alto de la Tierra, y Death Valley es una montaña más pequeña.
El Monte Everest es el punto más alto de la Tierra, y el Valle de la Muerte es relativamente plano.
Answer:
El Monte Everest es el punto más alto de la Tierra, y el Valle de la Muerte es relativamente plano.
Explanation:
how many valence electrons are there in a magnesium atom?
Answer:
Magnesium has 2 valence electrons.
( i will give you brainliest who ever answers the question first and the right answer!!!)
What do you predict would happen if you brought a negatively charged balloon next to an uncharged piece of paper?
A. The balloon will attract the paper.
B. The balloon will repel the paper.
C. Nothing will happen.
D. The paper will repel the balloon.
Answer: A
Explanation:
Answer:
B. The ballon will repel the paper
the protein’s specific sequence is?
Answer:
The linear sequence of amino acids within a protein is considered the primary structure of the protein. Proteins are built from a set of only twenty amino acids, each of which has a unique side chain. The side chains of amino acids have different chemistries.
Hope this helps
What do you put in the cavity of an unstuffed turkey?
A student heated a mixture of iron filings and sulfur strongly. He saw a red glow spread through the mixture as the reaction continued. At the end of the experiment a black solid had been formed.
a) Explain what the red glow indicates.
b) Give the chemical name of the black solid.
c) Write a word equation that and a balanced chemical equation to represent the reaction which has taken place.
d) The black solid is a compound. Explain the difference between the mixture of sulfur and iron and the compound formed by the chemical reaction between them.
Please answer part a, b, c, and d.
If you don't know the answer to all parts but you know the answer to one part then please answer it will still help
Answer:
the answer is c or a am I right☺
Scientists theorize that the original point of matter from which our universe formed was smaller than a dime. This matter would also have:
a. had unimaginable mass
b. been incredibly dense
c. had unimaginable potential energy
d. all of the above
ANSWER:
B. been incredibly dense? I'm not sure sorry
(what is the meaning of aids?) (what is the meaning of cushions?) (name 5 citrus fruits) ( what are antibodies?) (what are hormones?)
Answer:
Aids mean
a disease in which there is a severe loss of the body's cellular immunity, greatly lowering the resistance to infection and malignancy.
Cushions mean
a swollen floral system on which several small flowers are borne.
sweet mangogrape fruitpineapplelimelemonWhat are antibodies
this is a blood protein produced in respond to an counteracting a antigen.
What are hormones
these are chemicals that the body releases during a period of time
Explanation:
Why isn’t a dream made of matter?
Balance the following equations:
1.
Fe(s)+ O2(g) —> Fe2O3(s)
Answer:
4Fe(s)+3O2(g) ----> 2Fe2O3(s)
1) A book is pushed and released and it slides across a table for a short distance The book quickly comes to a stop. The book originally has kinetic energy. To what for at
energy is the kinetic energy transformed?
A) The kinetic energy is transformed into heat
B) The kinetic energy is transformed into chemical energy
C) The kinetic energy is not transformed into any other type of energy
D) The kinetic energy is transformed into electrical energy
Answer: A the kinetic energy is transformed into heat
Explanation:
The density of gold is 19. 3 g/cm3. What is the volume of a 13 g gold nugget? (Density: D = ). 25 cm3. 67 cm3 1. 48 cm3 2. 50 cm3.
Answer:
0.67 cm³Explanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\[/tex]
From the question
mass = 13 g
density = 19.3 g/cm³
We have
[tex]volume = \frac{13}{19.3} \\ = 0.673575...[/tex]
We have the final answer as
0.67 cm³Hope this helps you
What's a suitable assumption for a simple distillation lab?
Answer:
Must be stable and relatively insoluble in boiling water.
Explanation:
it must be stable and relatively insoluble in boiling water and a must-have vapor pressure in boiling water that is of the order atmosphere at or more compound satisfy these conditions that will generally not separate from each other but we'll be separated from everything else.
What is moisture in the atmosphere
Answer: MOISTURE IN THE ATMOSPHERE, in the form of water vapor, liquid water, and ice, controls most aspects of our weather and climate. ... Atmospheric moisture is expressed as clouds, precipitation, storms, weather fronts, and other phenomena.
When the metal was added to the calorimeter, some of the water splashed out. How would the loss of water in the Styrofoam cup affect the final temperature
The final temperature of the cup may be less than accurate thereby affecting the entire results of the experiment carried out using the cup.
A styrofoam cup is an insulated material. A styrofoam cup prevents heat gain or looses from the cup. Heat is gained by the water inside the styrofoam cup. The cup prevents exchange of energy with the environment.
When water is lost from the styrofoam cup, the final temperature of the cup may be less than accurate thereby affecting the entire results of the experiment carried out using the cup.
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oncepts
4 List What are some of the physical properties
of stars?
Answer:
Brightness. Two characteristics define brightness: luminosity and magnitude. ...
Color. A star's color depends on its surface temperature. ...
Surface Temperature. ...
Size. ...
Mass.
Explanation:
there
Please help I’ll give brainlist who ever answers I just want the answer so please help!!
Answer:
{B}
Explanation:
how many pairs of electrons are shared between two adjacent carbon atoms in a saturated hydrocarbon?
Elabore el balance de la ecuación por oxido reducción enumerando cada paso
CaC2O4 + KMnO4 + H2SO4 → CaSO4 + MnSO4 + K2SO4 + CO2 + H2O
Answer:
[tex]{ \rm{5CaC _{2}O _{4(aq)}+ 2KMnO _{4(aq)} + 8H _{2} SO _{4(aq)} → 5CaSO _{4(s)}+ 2Mn SO _{4(aq)}+ K _{2} SO _{4(s)} + 10CO _{2(g)} + 8H _{2} O _{l} }}[/tex]
Explanation:
This is a redox reaction formed by combining two half equations.
Check the image above, sorry if my handwriting is poor :(
How to add moisture to the air without a humidifier?
There are quite a few ways to add moisture into the air without a humidifier
A few things that can help add moisture are hanging your clothing to dry. hang drying your damp clothes will add moisture to the air over time as it evaporates and it will make your house smell like fresh clothes.
Another thing is a bath, allow the water to cool off and leave the bathroom door open, the steam will add moisture to the air as the water cools.
This might seem silly but putting bowls or vases of water out on the windowsill on a sunny day mill moistens the air as it evaporates.
You can also get houseplants, moisture evaporates from the leaves and stems of plants. transpiration can help increase the humidity in your home.
not sure if this is the answer you were looking for but if so im glad i could help. have a great day!
Calculate the normality of a solution made by diluting 12 g of H3PO4 with water to produce 250.0 mL of solution.
The normality of a solution made by diluting 12 g of H3PO4 with water to produce 250.0 mL of solution is 1.47 eq/L.
The normality of a solution is;
N = Mass of solute in grams/volume of solution in litres × Equivalent weight
Mass of solute = 12 g
volume of solution = 250.0 mL or 0.25 L
Equivalent weight = Molar mass of H3PO4/n
n = Number of hydrogen ions in H3PO4
Equivalent weight = 98 g/mol/3 = 32.7
Substituting values;
N = 12/0.25 × 32.7
N = 1.47 eq/L
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Pls help me!! Explain how the N:Z ratio can help predict the type of radiation Zr-85 and Zr-95 emit.
No links pls
Based on N:Z ratio, Zr-85 is expected to decay by positron emission. Zr-95 is expected to emit beta particles in a beta decay.
The N:Z ratio determines the stability of a nucleus. If a nucleus has N:Z ratio >1.5 or <1.0, such a nucleus is unstable and will undergo radioactive decay. The aim of such a decay is to attain a favorable N:Z ratio.
For Zr -85, the N:Z ratio is 1.1 while the N:Z ratio of Zr-95 is 1.4. Zr -85 is expected to decay by positron emission which increases the N:Z ratio. For Zr-95, the nucleus tends to undergo processes that decrease the N:Z ratio such as beta emission.
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