Answer:
We can't see the question. Can you upload a picture of it or write the question in the comments
KK
Which chemistry question?
A 100 kg tree gets struck by lightning and is burned completely to ash. A scientist gathers up all the ash and weighs it to find only 90kg there. Where did the other 10kg go?
Answer:
Evaporated via combustion.
Explanation:
The loss on ignition (LOI) and Ash content are inorganic analytical techniques used to determine the percentage by mass of hydrocarbon in compounds. This process allows volatile matter and possibly impurities found in a material to evaporate, leaving behind the true chemical constituents of the material.
The 10kg lost could be moisture content of the tree, or other volatile matter which has escaped on combustion of the tree.
at show clearly how bonding occured in (cao)
Calcium
oxide
Answer:
They both combine with The help of valency, which is the combining capacity of elements
Explanation:
I find it easier to understand valency as part of the Bhor’s model of an atom.
In his model, it was stated that electrons are spread around the nucleus in such a way that there are rings around the model. Each ring has a n value. So, k has 1, l has 2, m has 3 and n has 4...
what you need to know to find the number of electrons in each ring is to solve the formula 2n squared
Then, the valency is the 8 minus the number of electrons in the outermost shell. Remember that 8 is max number I;outer most shell. If you try it out for oxygen, you will get the value of 2 remaining, which can be gained if combined with calcium.
Hope it helps
Write down the “Word chemical equation” for the following described chemical reaction. 1.When Harris dropped a lump of magnesium into a test tube of hydrochloric acid, the chemical magnesium chloride was formed. Harris also noticed a gas being formed. The gas formed was Hydrogen.
Answer:
Here is the word equation and balanced equation to this question.
Explanation:
Magnesium + hydrochloric acid ⇒ Magnesium Chloride + Hydrogen gas
Mg + 2HCl⇒ MgCl₂ + H₂
10 grams of sodium hydroxide, NaOH, is dissolved in 0.25 liters of solution. Determine the molarity (M).
Answer:
1M
Explanation:
The molarity of a substance is defined as the number of moles of the substance divided by how many liters the solution is. NaOH has a molar mass of about 40 grams, meaning that 10 grams of it would be 0.25 moles. 0.25/0.25= a molarity of 1.
Hope this helps!
Which is a type of lipid?
A. Disaccharide
B. Triglyceride
C. Nucleotide
D. Enzyme
SUBMI
Answer:
B. triglyceride
Explanation:
Answer:
triglyceride becauseit is a fatty acid
1. 3 g of Calcium Chloride (CaCl2) is added to 500 mL of water. It all dissolves. Determine the concentration of Chloride ions in the solution.
Answer:
pls help
Explanation:
Urgent help please!!
Answer:
1. 2.1 moles of Mg
2. 0.72 mole of Mg(OH)2
Explanation:
1. We'll begin by writing the balanced equation for the reaction. This is given below:
3Mg + 2AlBr3 —> 3MgBr2 + 2Al
From the balanced equation above, 3 moles of Mg reacted to produce 2 moles of Al.
Therefore, Xmol of Mg will react to produce 1.4 moles of Al i.e
Xmol of Mg = (3 x 1.4)/2
Xmol of Mg = 2.1 moles.
Therefore, 2.1 moles of Mg is required to 1.4 moles of Al.
2. We'll begin by calculating the number of mole in 26g of water, H2O.
This is illustrated below:
Molar mass of H2O = (2x1) + 16 = 18g/mol
Mass of H2O = 26g
Number of mole of H2O =?
Mole = Mass /Molar Mass
Number of mole of H2O = 26/18
Number of mole of H2O = 1.44 moles
Next, we shall write the balanced equation for the reaction. This is given below:
2HNO3 + Mg(OH)2 —> Mg(NO3)2 + 2H2O
Finally, we can obtain the number of mole of Mg(OH)2 used in the reaction as follow:
From the balanced equation above,
1 mole of Mg(OH)2 reacted to produce 2 mole of H2O.
Therefore, Xmol of Mg(OH)2 will react to produce 1.44 moles of H2O i.e
Xmol of Mg(OH)2 = (1 x 1.44)/2
Xmol of Mg(OH)2 = 0.72 mole.
Therefore, 0.72 mole of Mg(OH)2 was used in the reaction.
Find the sum of - 1 /5 and reciprocal of 6 /11
Answer:
49/30Solution,
Reciprocal of 6/11=11/6
Now,
-1/5+11/6
=-1*6+11*5/30
=-6+55/30
=49/30
Hope it helps
Good luck on your assignment
The kinetic molecular theory helps explain relationships between
It explains the relationships between molecules of gases, liquids and solids.
gases, energy, temperature, phases.
Which of the following could be classified as matter? desk,water,idea,cloud,helium,dream
Answer:
Desk water cloud heliumExplanation:
because matter occupies space
Answer:
Matter is anything that has weight and occupies space
So examples of matter are
Desk, water, cloud, and helium.
Explanation:
Which of these is not an example of physical weathering?
Freeze-thaw
Acid rain falling on limestone
Wind blowing sand onto a rock
An example which doesn't depict physical weathering is acid rain falling on limestone.
Physical weathering involves the breakdown of rock into smaller particles through physical processes such as friction between rocks as a result of wind blowing sand onto rocks, freeze-thaw in colder climates etc and it is usually reversible.
Chemical weathering on the other hand involves the breakdown of rock into smaller particles through chemical processes or reaction such as acid rain falling on limestone and it is usually irreversible.
Read more on https://brainly.com/question/16746784
A force of 6 newtons is used to move an object 10 meters. How much work is done?
600 newton-meters
6 newton-meters
60 newton-meters
10 newton-meters
Answer:
60
Explanation:
its force x distance
To separate a mixture of hard candies and
marbles, the most efficient method would be
Answer:
depends on the size andt shape i think hand picking would be most efficient.
Explanation:
The most efficient method to separate a mixture of hard candies and marbles would be to use a physical property that is unique to one of the components of the mixture.
In this case, the physical property that can be exploited is the difference in size and shape between the hard candies and the marbles. Since marbles are solid spherical objects and hard candies are irregularly shaped, it is possible to employ a sieving or filtration method to separate them.
A sieve or a mesh with openings smaller than the marbles but larger than the hard candies can be used. By pouring the mixture onto the sieve and shaking it gently, the marbles will be retained on the sieve while the smaller-sized hard candies will pass through the openings and be collected separately.
Know more about physical property:
https://brainly.com/question/24632287
#SPJ2
WHAT IS THIS SYMBOL AND HOW DO I FIND THIS?
I asked so many of my friends what this is but I don't know! I know that Ea is activation energy, but this is different.
I attached the graph and the question with the odd symbol.
I will mark Brainliest!
What is the compound name for the ion chemical formula AgBr?
Answer:
Silver bromide.
Explanation:
If each washer has a mass of 4.9 g, then the mass of two washers in kilograms would be . Given that F = ma, and if 4 washers are attached to the string and car instead of 2, then the applied force on the car will be .
Answer:
0.192 N
Explanation:
Answer:
I just did it in ed
Explanation:
why do you think the purple cabbage indicator used in this experiment is called "red cabbage"? where is it typically used in food?
Answer:
Red cabbage juice contains a natural pH indicator that changes colors depending on the acidity of the solution. The pigment in red cabbage that causes the red color change is called flavin (an anthocyanin). ... At a lower pH, more hydrogen ions are in solution, and therefore the solution is acidic
Actually I don't know but I tried so I hope it helped u!
What does the difference between 256 and 101 in 256/101 Md represent?
the atomic number
the nuclide number
the mass number
the number of neutrons
Answer:
The atomic number
Explanation:
What is the protein that helps us identify the blood type
Answer:
Antigens (more info below)
Explanation:
Antigens determine the blood type and may be either proteins or sugar molecule complexes (polysaccharides). Genes in the blood group antigen group provide instructions for the production of antigen proteins. Blood group antigen proteins serve a variety of functions within the red blood cell membrane.
hope I helped!
To what Kelvin temperature must a balloon
be cooled if its original temperature
was 323 °C to cause a 2.85 L balloon shrink to 1.25 L?
Answer:
[tex]T_2=261.46\ K[/tex]
Explanation:
It is given that,
Original temperature, [tex]T_1=323^{\circ}C=596.15\ K[/tex]
Original volume, [tex]V_1=2.85\ L[/tex]
We need to find the temperature if the volume of the balloon to be shrink to 1.25 L.
According to Charles law, at constant pressure, [tex]V\propto T[/tex]
It would means, [tex]\dfrac{V_1}{V_2}=\dfrac{T_1}{T_2}[/tex]
T₂ = ?
[tex]T_2=\dfrac{V_2T_1}{V_1}\\\\T_2=\dfrac{1.25\times 596.15}{2.85}\\\\T_2=261.46\ K[/tex]
So, the new temperature is 261.46 K.
All chemical reactions happen very fast? -true -false
Answer:
false
Explanation:
Oxidation of iron to make rust is a slow reaction.
Which formula represents a hydrocarbon?
A) CH3I
B) CH3NH2
C) CH3CH3
D) CH3OH
What does global wind mean
Answer:
Global winds are the main belts of wind that move in a particular direction across the earth
Answer:
Global winds are the main belts of wind that move in particular directions across the Earth.
Explanation:
All wind is caused by the uneven heating of Earth's surface, which sets convection currents in motion. Convection currents on a large scale cause global winds; convection currents on a small scale cause local winds.
hope that helps love!
Which form of energy is directly related to the measure of the average kinetic energy of the particles in a substance?
thermal energy
potential energy
mechanical energy
electromagnetic energy
Answer:
thermal energy
Explanation:
explain why the freezing of water into ice causes the cracks to widen
Answer:
The freezing of water into ice causes the cracks to widen because it occupy more space.
Explanation:
When the water change its state of liquid to solid state due to decrease in temperature, it contracts means occupy less space but when the temperature reaches to 4 degree Celsius, it starts to expand. When the temperature goes below 0 degree Celsius, it will cause more expansion and occupy more space that causes the cracks to widen.
Draw a schematic diagram with a battery, connecting wires, a light bulb, and an ammeter in a series circuit.
Answer:
here it is
....................................................................................................................................
An alkali is able to “cancel” out an acid. What is the other word for “cancelling out the acid”?, Ill mark brainliest if your answer is correct ;))
a) neutralise
b) overcome
c) nullify
d) become acidic
Answer:
neutralise
Explanation:
There is a special name given to the reaction between an acid and a base to form salt and water and water only. That name is 'neutralization'. Hence to 'neutralize' an acid connotes the idea of 'cancelling' the effect of an acid.
An acid has a number of deleterious effects on surfaces, the most prominent of which is corrosion of the surface due to oxidation. If a surface is accidentally exposed to an acid, the effect of that acid on the surface can be counteracted by the immediate application of a base to 'neutralize' the acid. Neutralization in this sense is akin to 'cancelling' out the acid.
The examples are endless. Another common example is the neutralization of an acidic soil by a base in order to 'cancel' the acidity of the soil and make the soil fertile for plant growth.
From which plant can benzoic acid be obtained from?
Explanation:
styrax benzoin is what benzoic acid is obtained from
Select the correct answer
Which statement is true of a chemical change?
0 A
OB
It involves changes in the molecular structure.
It involves changes in phase but not changes in the molecular structure.
It involves dissolving one substance into another.
OC.
D.
It involves a change in the state, or phase of a substance.
О Е.
It involves the process of separating two or more dissolved substances.
Answer:
i think its B but im not so sure
How many total orbitals are within the 3s 3p, and 3d sublevels of the third
energy level?
A. 8
B. 9
C. 1
D. 4
Answer:
9
Explanation:
Answer:
b
Explanation:
