Answer:
1. 2Mg + O2 —> 2MgO
2. 2H2 + O2 —> 2H2O
3. CH4 + 2O2 —> CO2 + 2H2O
Explanation:
1. Magnesium + Oxygen —> Magnesium Oxide
Mg + O2 —> MgO
There are 2 atoms of O on the left side and 1 atom on the right side. It can be balance by putting 2 in front of MgO as shown below:
Mg + O2 —> 2MgO
There are 2 atoms of Mg on the right side and 1 atom on the left side. It can be balance by putting 2 in front of Mg as shown below:
2Mg + O2 —> 2MgO
Now the equation is balanced.
2. Hydrogen + Oxygen —> Water
H2 + O2 —> H2O
There are 2 atoms of O on the left side and 1 atom on the right side. It can be balance by putting 2 in front of H2O as shown below:
H2 + O2 —> 2H2O
There are 2 atoms of H on the left side and a total of 4 atoms on the right side. It can be balance by putting 2 in front of H2 as shown below:
2H2 + O2 —> 2H2O
Now, the equation is balanced.
3. Methane + oxygen à Carbon dioxide + Water
CH4 + O2 —> CO2 + H2O
There are 4 atoms of H on the left side and 2 atoms on the right side. It can be balance by putting 2 in front of H2O as shown below:
CH4 + O2 —> CO2 + 2H2O
There are 2 atoms of O on the left side and a total of 4 atoms on the right side. It can be balance by putting 2 in front of O2 as shown below:
CH4 + 2O2 —> CO2 + 2H2O
Now, the equation is balanced.
A 100mL sample of 0.1MMgCl2(aq) and a 100mL sample of 0.2MNaOH(aq) were combined, and Mg(OH)2(s) precipitated, as shown by the equation above. If the experiment is repeated using solutions of the same molarity, which of the following changes in volume will double the amount of Mg(OH)2(s) produced?
a. Using the same volume of MgCl2(aq) but twice the volume of NaOH(aq)
b. Using twice the volume of MgCl2(aq) but half the volume of NaOH(aq)
c. Using twice the volume of MgCl2(aq) but the same volume of NaOH(aq)
d. Using twice the volume of MgCl2(aq) and twice the volume of NaOH(aq)
Answer:
Using twice the volume of MgCl2(aq)MgCl2(aq) and twice the volume of NaOH(aq)NaOH(aq)
Explanation:
The amount of Mg(OH)2 is doubled when the volume of the reactants is doubled because they still react in the ratio of 2:1.
The reaction between MgCl2 and NaOH occurs as follows;
MgCl2(aq) + 2NaOH(aq) -----> Mg(OH)2(s) + 2NaCl(aq)
We can see that the mole ratio of the reactants is 1:2.
Initial number of moles of MgCl2 = 100/1000 L × 0.1 M = 0.01 moles
Initial number of moles of NaOH = 100/1000 L × 0.2 M = 0.02 moles
If i double the volume of each reactant;
Number of moles of MgCl2 = 200/1000 L × 0.1 M = 0.02 moles
Number of moles of NaOH = 200/1000 L × 0.2 M = 0.04 M
We can see that the amount of Mg(OH)2 is doubled when the volume of the reactants is doubled because they still react in the ratio of 2:1.
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Solar cells can be used to power calculators and cars, and to heat buildings. T or F
Answer:
True
Explanation:
Silver is a white metal and is an excellent conductor of heat and electricity. The density of silver is 10.49 g/cm³. Silver does not react with water, but it does react with nitric acid. Silver tarnishes when exposed to air or light. Which is a physical property of silver?
Athlete’s foot is a fungus that attacks the area between the toes and sometimes the sole of the foot, causing redness, irritation, and a scaly look to the skin. It may even invade the area under the toenails. The fungus thrives in damp, warm places, such as shower rooms, swimming pools, and gymnasiums.
a.) Mutualism
b.) Commensalism
c.) Parasitism
d.) Predator-Prey
Answer:
Parasitism
Explanation:
A teacher placed a plastic cup of warm coffee with a lid in the freezer.
Which statement describes the frozen coffee in comparison with the warm coffee?
A. The arrangement of the coffee molecules in the same
B. The temperature of the coffee has increased
C. The amount of coffee in the same
D. The speed of the coffee molecules has increased
Answer:
C. The amount of coffee is the same.
Explanation:
Verified
Joelle is a manager at a construction company, and she is interested in the chemistry behind the materials they use. She has begun studying the materials used to fill walls. She knows that to keep the temperature inside a room steady the material must be a thermal insulator, and she predicts that materials should not be acidic or else they would dissolve too easily in water.
Which of these is a molecular ingredient that could be used in a wall-filling material ?
C6H6
Na6Ba6
NeNa
HCl
Answer:
C6H6
Explanation:
Now let us take a recap of Joelle's criteria for a wall filling material;
1) the material must be a thermal insulator
2) materials should not be acidic
3) they will not dissolve too easily in water.
If we consider the options provided, Na6Ba6 and NeNa do not exist. HCl is an acid and does not match Joelle's criteria. Hence the answer must be C6H6.
Answer:
A
Explanation:
The movement overall of molecules from regions of high concentration to regions of low concentration is called _______.
a.diffusion
b.osmosis
c.concentration
Answer:
diffusion is the answer
Explanation:
which of the following is a change of state of a substance?
Answer:
C
Explanation:
Water which is a liquid becomes ice which is a solid
That would be C, due to the fact that the water changes from a liquid to a solid. (I hope that helped ^^)
What is a chemical reaction?
Oь
A chemical reaction happens only under special circumstances.
A chemical reaction is when the bonds of one substance form and then break which makes something different.
A chemical reaction has infinite possiblities to happen.
A chemical reaction is when the bonds of one substance break and form new bonds to make something different.
ос
Od
Answer:
a process that involves rearrangement of the molecular or ionic structure of a substance, as opposed to a change in physical form or a nuclear reaction
What is the funtion of an atomic atom?
What is found between the monomers on the different strands of DNA
Phosphodiester bonds found between the monomers on the different strands of DNA.
What is DNA ?Deoxyribonucleic acid is called as DNA. The molecule found inside cells that carry the genetic material necessary for an organism to develop and function. This knowledge can be passed on from one generation to the next thanks to DNA molecules.
The information molecule is DNA. It contains information needed to create proteins, which are other big molecules.
In DNA polymers, phosphodiester bonds link the 5' carbon of one nucleotide and the 3' carbon of another nucleotide. In a DNA polymer, phosphodiester bonds strong electromagnetic attractants join the nucleotide monomers together.
Thus, Phosphodiester bonds found between the monomers on the different strands of DNA.
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The smallest of the -2 ions?
Answer:
Ionic radius increases down the group, therefore Li+ ion has the smallest ionicsize out of the three ions.
Researchers are studying lichens growing on trees in a forest ecosystem. At the
beginning of the study, the researchers identified twelve lichen species in the forest.
Later, a forest fire happened in the study area. The researchers returned to the area and
found only six lichen species.
Which inference is best supported from the researchers' observations?
Answer:
The answer is C
Explanation:
C
The inference is best supported from the researchers' observations is (D) Certain Lichen species are better adapted to survive forwst fire than others. Hence the correct option is (D).
What is Adaptation ?Adaptation is a dynamic process of Natural selection which helps organisms fit better into their environments and improves their evolutionary success.
The population arrives at it during that process.
The six lichen species that have survived can be inferred to be either genetically evolved to be fire resistant or to recover quickly from an inferno. The other six species that perished, however, weren't prepared for these circumstances.
Therefore, The inference is best supported from the researchers' observations is (D) Certain Lichen species are better adapted to survive forwst fire than others. Hence the correct option is (D).
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if anybody knows these 3 answer plz
Answer:
Skylight is a research, community building, consultation and support unit advancing the science behind education.
When the lava meets the sea, it cools quickly while boiling the ocean into steam.
Explanation:
Why is "calcium(II) chloride" an improper name for CaCl2? a.) Because this is not an ionic compound. b.) Because the proper name is "calcium dichloride". c.) Because the calcium ion always has a 2+ charge and the "(II)" is unnecessary. d.) Because chlorine is a diatomic element. e.) Because calcium makes an anion when it makes ionic compounds.
Answer:
c.) Because the calcium ion always has a 2+ charge and the "(II)" is unnecessary.
Explanation:
Why is "calcium(II) chloride" an improper name for CaCl₂?
a.) Because this is not an ionic compound. NO. This is an ionic compound.
b.) Because the proper name is "calcium dichloride". NO. The proper name is calcium chloride.
c.) Because the calcium ion always has a 2+ charge and the "(II)" is unnecessary. YES.
d.) Because chlorine is a diatomic element. NO. This is unrelated to the name of the compound.
e.) Because calcium makes an anion when it makes ionic compounds. NO. Calcium makes a cation with 2+ charge.
a chemical change is a change in the ___ of a substance
Jen is walking her dog at a constant rate.
They keep a constant rate as they turn a
corner. Why has their velocity changed?
Answer:
4is the answer
Explanation:
Can someone help me put this in my ‘own’ words please ?
Answer:
I think this should help
Photosynthesis happens when the sun and carbon dixoxide come together in the plant and a chemical reaction happen that make a suger thats called glucose
Explanation:
The type of bonding depicted below is most likely:
Answer:
C Ionic
Explanation:
9.
Which of the following best describes the term VACUUM?
A. A vibration moving energy from place to place.
B. The part of a wave that is pushed together.
C. Empty Space
D. The material through which a mechanical wave can travel.
Answer:
C. Empty Space
Explanation:
A vacuum is an empty space.
In a vacuum, there is no form of matter present. A vibration moving energy from place to place is a waveThe part of a wave pushed together is called a compressionThe material through which a mechanical wave can travel is a mediumSo, a vacuum is simply an empty space devoid of matter.
which statement describes the pattern in the density of gases in the atmosphere
Answer:They are less dense near the top of the atmosphere.
Explanation:
2NaOH + H2SO4 → Na2SO4 + 2H20
(What reaction would occur)
In the interactive, start adding neutrons to the nucleus.
What happens to the mass number each time you add a neutron, and why?
Answer:
Explanation:
Each time you add a neutron, it adds one mass number to the mass because each neutron and proton weighs approximately 1 amu.
Answer:
The mass increases
Explanation:
When protons and neutrons are added, the mass increases. Electrons, on the other hand, are so small they do not affect the mass.
A is glossy and ductile. A is used as a conductor of electricity.
Which of the following is the best description of A?
Answer:
It is a metal
Explanation:
4. A gram of salt can be dissolved in 100 ml of water. What factors
affect the solubility?
a. Amount of solute
b. Amount of solvent
c. Size of solute
d. Manner of stirring
What is the difference between melting and burning a substance? Is mass conserved in either process?
Answer:
First Question:
Melting is a physical process that involves the phase transition of a substance from its solid to its liquid state. Burning, on the other hand, is a chemical process that involves a substance being broken down and changed into different substances. It's still the same substance, though: water.
Second Question:
Mass is therefore never conserved because a little of it turns into energy (or a little energy turns into mass) in every reaction. But mass+energy is always conserved. Energy cannot be created out of anything.
Explanation:
What is the molecular formula of water vapour?
Answer:
Water vapor still has the same chemical formula as typical water - H2O - but the water molecules in vapor interact less with one another and are not as structured as they are in water and ice.
Explanation:
Describe the development of the periodic table.
Mendeleev's holes have long since been filled in and new elements have been added to the periodic table.
What is periodic table?Periodic table is defined as a list of chemical elements that are ordered in atomic number order, typically in rows, with comparable chemical elements appearing in vertical columns because of their similar atomic structures. The table can be used by scientists to anticipate chemical reactions, study trends in the periodic properties of certain elements, and speculate on the properties of yet-to-be-discovered elements.
The structure for the contemporary periodic table was developed in 1869 by Russian chemist Dmitri Mendeleev, who left spaces for elements that had not yet been discovered. He organized the elements into groups based on their atomic weight, rearranging them if necessary if he found that they did not fit.
Thus, Mendeleev's holes have long since been filled in and new elements have been added to the periodic table.
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1) Sarah's family raises chickens,
They buy 15 pounds of feed per
week. If chickens eat all but 4
pounds, how many ounces of
feed did they eat?
Answer:
hhdbnahdhs
Explanation:
hajsbbdjsod
What's the difference between the "matter that makes up wood" and the "matter that makes up water"? Explain your ideas in full sentences.
They describe different forms of matter, solid and liquid. As well as both being entirely differently structured forms of matter.
They distinguish between solid and liquid matter. In addition to being completely different types of matter.
What is matter?Matter is defined as everything that takes up space other words, the "material" that makes up the universe.
All matter is composed of substances known as elements, each of which has unique chemical and physical properties and cannot be decomposed into other materials through ordinary chemical reactions.
Atoms and molecules make up some of the material in the category of solids, liquids, and gases.
The matter that makes up wood have characteristics of any solid, i.e., high intermolecular force of attraction that holds it shape.
The matter that is making water will have liquid characteristics, which do not have a particular shape and will have weak intermolecular forces of attraction.
Thus, this is the chief difference between the "matter that makes up wood" and the "matter that makes up water".
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