Answer:
12 g
Explanation:
Chemical equation:
MgCO₃ → MgO + CO₂
12g = 5.28g + 6.72 g
12 g = 12 g
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
This law was given by French chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
MgCO₃ → MgO + CO₂
There are 12 g of magnesium carbonate on the left side, according to the law of conservation of mass on the right side there should be 12 g product. Thus, 6.72 g of CO₂ should be formed.
5 points
What do you think photosynthesis means ?
Explanation:
In short answer- Photosynthesis is the process in which plants and geen gigmant makes their own food.
1. What causes potential energy to change within a system?
2. How does the location of an energy generation source affect the available potential energy?
Answer:
C D
Explanation:
What are some examples of HIGH resistance?
Options:
narrow wire, less resistors, long wire
long wire, wide wire, more resistors
long wire, narrow wire, more resistors
wide wire, short wire, less resistors
Answer:
Its long wire narrow wire more resistance
Explanation:
I took the same k12 test
Answer: it’s long wire narrow wire more resistors
Explanation: I took the same k12 test
good Luck cheating I mean using your resources
Question 10 of 10 Which statement accurately describes malleability? A. A material slows or completely blocks the flow of electrons through it. B. A liquid with larger molecules resists movement more than a liquid with smaller molecules does. C. Attractive forces between molecules at the surface cause a liquid to resist spreading out. D. A material with relatively weak bonds between its particles can be shaped into a thin sheet. SUBMIT
Malleability is the physical property of the metal by which it can alter its shape. It is due to relatively weaker bonds between the particles. Hence, Option (D) is correct.
What is malleability?The ability of a material to form thin sheets under pressure by hammering or rolling is called malleability. The hammers and machines are used as an external force to alter the shape and structure. Aluminum, copper, gold, iron, etc are malleable metals.
Malleability is the property of metals due to their ability to change their shape beyond their limit of compression. These substances can be rolled or even can be made as sheets and are used in making tools and machines.
Therefore, option D. malleability is due to weaker bonds between its matter particles.
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Which is most likely a reason why most reptiles fail to give their offspring parental care after laying the eggs?
Answer:
The eggs have tough shells that provide protection until the eggs hatch.
Explanation:
They are able to walk about on their own, but they are defenseless against egg eaters. Even so, most reptile progenitors contribute no attention to their hatch-lings. In fact, most reptiles don't even take custody of their eggs. ... They may protect their nest from predators and maintain the hatch-lings move to the water.
Choose the COEFFICIENTS that balance the equation by the inspection method.
Answer:
somebody please help her or him please please
A plant that has both male and female reproductive structures is able to.
A plant that has both male and female reproductive structures can self pollinate.
What is pollination?Pollination is the process in which pollen grains are being transferred from the male anther of a flower to the stigma of a female flower. Two forms of pollination include:-
Cross-pollination:- Pollen grains are transmitted from the stamen of one flower to the stigma of a flower on another plant of the same species in cross-pollination.
Self-pollination:- The process of transferring the pollen grains from the anther to the stigma of the same flower or the stigma of a flower on the same plant is called self-pollination.
Pollination by insects is called entomophily and pollination by birds is called ornithophily. Pollination by vertebrates is known as zoophily. Abiotic agents – Wind and water. Wind pollination is known as anemophily and pollination by water is called hydrophily.
Therefore, A plant that has both male and female reproductive structures can self pollinate.
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Which of the following best describes how forces affect matter?
A. Forces create matter
B. Forces hold matter together.
C. Forces conserve matter.
D. Forces keep matter warm
it is b forces hold matter together
A force is a push or pull on an object. Forces usually cannot be seen but their effects can. Nothing moves, changes speed, stops or changes direction without force. Heavier objects need more force to get them to move or change direction.
Answer:
Yup, it's B. Forces hold matter together.
Explanation:
The other user is correct. :)
How can controlling the way light bends and reflects be used to help people?
Answer:
The reflection of light serves to indirectly illuminate some things or objects and thus better visualize it from different human perspectives or different human views
Explanation:
Indirect visions through light reflections are widely used in detailed work or in areas where the field of work is small, an example of this is the dental area, where a mirror number 15 is used to be able to make the visual inspection of the mouth. , in the upper jaw by means of light reflection.
Some horses are bred for speed while other horses are bred for pulling heavy loads. What is the main influence on weather a horse will become a racehorse or farm horse?
Answer:
Good environmental and weather conditions.
Explanation:
The main influence for a horse that will become a racehorse or farm horse are good environmental and weather conditions. It also needs good food and proper training to made a racehorse. High quality race of a horse always prefer for making a racehorse because it has higher agility, speed, and spirit as compared to horse belongs to ordinary race.
What cell structure is found only in Eukaryote cells, but not in Prokaryote cells?
Answer:
Every living organism falls into one of two groups: eukaryotes or prokaryotes. Cellular structure determines which group an organism belongs to. In this article, we will explain in detail what prokaryotes and eukaryotes are and outline the differences between the two.
Explanation:
Answer:
nucleus
Explanation:
30. A solid sample contains only CaCO3, and MgCO3.
To completely react the CaCO3 and MgCO3
present in the sample. 42.00 cm of 0.088 M
HCI were required. The anhydrous chloride salts
from the reaction, obtained by evaporation of
the filtrate weighed 0.19 g. The mass of CaCO3
present in the solid sample is (C = 12,0 = 16,
Mg = 24, Ca = 40, CI = 35.5 )
(1) 0.05 g.
(2) 0.07 g
(3) 0.09 g
(4) 0.11g
(5) 0.12 g
Answer:
Explanation:
Step 1
The mass percent of MgCO3 in the original mixture is calculated as shown,
Step 2
Masses of MgCO3 and CaCO3 is 24g; Moles of carbon dioxide produced from Magnesium carbonate and Calcium carbonate are.
Step 3
Adding and equating the moles of Carbon dioxide results in,
Step 4
Percent mass of MgCO3 in the sample is calculated as,
Evaluate the following scenario and critically think about the following statement:
"Chemistry is like cooking"
Last night I made a large pot of soup. I added the following ingredients into a pot:
[Potatoes, green beans, onion, celery, carrots, chicken, sazon, adobo, rice]
I added some heat into this pot and let it simmer for about 30 minutes. After I finished cooking the soup, I went ahead and served myself a large portion. To my surprise, when I was eating the soup, I found that there was beef and noodles in the soup?!
1. Is this scenario possible?
2. Does this equation make sense?
[Ingredients for chicken and rice soup] yield [beef and noodle soup]
3. In chemistry, do my ingredients need to match the results?
Answer:
No
No
Yes
Explanation:
What can you conclude about x-rays compared to microwaves? (2 points) X-rays have the same frequency as microwaves. X-rays have a lower frequency than microwaves. X-rays have a longer wavelength than microwaves. X-rays have a shorter wavelength than microwaves.
Answer:
X-rays have a shorter wavelength than microwaves.
Balance these equations!
1)
AIBr; +
K-
KBr +
AI
Answer:
Instructions on balancing chemical equations:
Enter an equation of a chemical reaction and click 'Balance'. The answer will appear below
Always use the upper case for the first character in the element name and the lower case for the second character. Examples: Fe, Au, Co, Br, C, O, N, F. Compare: Co - cobalt and CO - carbon monoxide
To enter an electron into a chemical equation use {-} or e
To enter an ion specify charge after the compound in curly brackets: {+3} or {3+} or {3}.
Example: Fe{3+} + I{-} = Fe{2+} + I2
Substitute immutable groups in chemical compounds to avoid ambiguity.
For instance equation C6H5C2H5 + O2 = C6H5OH + CO2 + H2O will not be balanced,
but PhC2H5 + O2 = PhOH + CO2 + H2O will
Compound states [like (s) (aq) or (g)] are not required.
If you do not know what products are enter reagents only and click 'Balance'. In many cases a complete equation will be suggested.
Reaction stoichiometry could be computed for a balanced equation. Enter either the number of moles or weight for one of the compounds to compute the rest.
Limiting reagent can be computed for a balanced equation by entering the number of moles or weight for all reage
Explanation:
SHOW WORK
A dog weighs 15 lbs, what is that weight in oz?
Answer:
240 oz
Explanation:
1 ibs= 16 Oz
15 ibs= 15 × 16 = 240 oz
Sodium is a metal that explodes in water, while chlorine is a poisonous gas. When combined, however, they make edible table salt. Why?
Group of answer choices
1) When atoms bond they undergo a chemical change, which changes their physical properties.
2) Two negatives make a positive
3) Salt is actually still poisonous, because of the chlorine in it.
4) The sodium and the chlorine have undergone a physical change, into a solid. The solid part is edible.
Answer:
Option B
Explanation:
While adding salts to water is a pretty safe chemical reaction, in its elemental state, each component can be highly reactive. Sodium and chlorine both react violently with water, but are stable when their ions are together in a salt.
What type of atoms form ionic bonds
Answer:
onic bonds usually occur between metal and nonmetal ions. For example, sodium (Na), a metal, and chloride (Cl), a nonmetal, form an ionic bond to make NaCl. In a covalent bond, the atoms bond by sharing electrons. Covalent bonds usually occur between nonmetals.
Explanation:
In the give question, ionic bonds are formed between metals and nonmetals.
An ionic bond is a type of chemical bond that involves the transfer of electrons from one atom to another.
Metals tend to lose electrons easily, while nonmetals tend to gain electrons easily. So, ionic bonds are typically formed between metals and nonmetals.
For example: Table salt (NaCl)
It is formed when sodium (Na), a metal, loses an electron to chlorine (Cl), a nonmetal, which gains that electron. The resulting ions,[tex]\rm Na^+\ and \ Cl^-[/tex], are then attracted to each other, forming an ionic bond.
Therefore, metals and nonmetals combine together to form ionic bonds.
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What is the independent variable in this reaction
Answer:
Explanation:
what wheres the answer???
Please help, there is a picture with the question
Answer:
Bromine
Explanation:
They are in the same collumn and elements share the most properties with those in their family
Electron affinities generally become more favorable (more negative) as you move from left to right across a
period. However, the electron affinity for Be is less favorable than the electron affinity for Li, as shown below.
Li(g) + e + Li (9) EA = -60 kJ/mol
Be(g) + e + Be (g) EA> 0 kJ/mol
Which of the following best helps to explain why the electron affinity for Be is less favorable than the electron
affinity for Li?
Answer:
Explanation:
Be has a full 2s orbital whereas Li has a paramagnetic orbital; i.e., incomplete orbital which serves to need an electron to fill while Be does not.
The electron affinity of Be is higher than Li, as Be has been shielded with high energy than Li.
The electron affinity has been defined as the energy required to add an electron to the ground state of the atom.
The nonmetal has easily able to gain the electron and thus have low electron affinity, while metals have high electron affinity.
On moving from Li to Be there has been an addition of the electron. The electron addition in Be has been more difficult as the coming electron is shielded from the core elements strongly.
Thus, the electron affinity of Be is higher than Li, as Be has been shielded with high energy than Li.
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MULTIPLE CHOICE
A student added phenolphthalein to two solutions. Solution A remained clear while Solution B
turned pink. Which of the following could be the pH of Solution B?
The pH of the solution B will be 10.
• One of the indicators that helps the chemists to determine visually that whether the substance is an acid or a base is the phenolphthalein.
• The phenolphthalein changes color due to ionization, and this changes the shape of the molecules of phenolphthalein.
• Naturally, phenolphthalein is colorless, however, it turns pink in alkaline solutions.
• The solution turns pink at the pH ranging between 8.2-10.
• Phenolphthalein has two distinct compositions based on whether it is an acid (colorless) or alkali (pink) solution.
Thus, turning of solution B to pink color by adding phenolphthalein indicator shows that the pH of the solution would be 10 based on the given options.
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Can somebody help me I’ve been a helping hand all day and nobody helping like does the app work or I need to delete.
I believe that #1 is the lie, but I'm not great at this subject.
Fill in the blanks to describe the work of Ben Kennedy, a volcanologist who works in New Zealand. To learn more about why his pumice sample was shrinking, Ben Kennedy studied . This material is similar to pumice because both are full of air . Kennedy found that the shrinking had to do with molten rock’s surface , which is the force that holds a droplet of water together.
Answer:
1)- foam
2)- bubbles
3)- tension
Explanation:
Answer:
1. Foam
2. Bubbles
3. Tension
Explanation:
Right on Edge
How many molecules of H2O are in 8.54 moles of H2O?
Select one:
a)5.14 * 10^24 molecules H2O
b)2.86 * 10^23 molecules H2O
c)6.02 * 10^23 molecules H2O
d)5.14 * 10^23 molecules H2O
Answer:
a)5.14 * 10^24 molecules H2O
Explanation:
8.54 moles of H2O contains 8.54 x 6.022 x 10^23 = 5.14 x 10^24 molecules of H2O.
Which statements about viruses are true? Select all that apply.
Viruses can be seen with a compound light microscope.
Viruses vary greatly in size and structure.
Some viruses contain RNA instead of DNA.
Some viruses use the cell's machinery to replicate more viruses.
Plant viruses can infect animals if ingested.
Bacteriophages are viruses that infect bacteria, plants, and animals.
Answer:
Viruses can be seen with a compound light microscope.
Viruses vary greatly in size and structure
Some viruses use the cell's machinery to replicate more viruses
Explanation:
Please help!
Avogadro's number is the number of particles in one gram of a carbon-12 atom. (2 points)
True
False
(EDIT: Answer is false, just took the test)
Answer:
false
Explanation:
Avogadro's number : the number of units in one mole: 6.022 × 1023, which is the number of atoms in 12 grams of carbon-12.
Answer:
false
Explanation:
i took the test.
Five molecules will enter the BODY of an organism(1.Amino Acids, 2. Protein, 3. Glucose, 4. Starch, and 5. Oxygen). However, only three molecules will actually enter the CELLS. Which three molecules will enter every cell in the human body?
EZ POINTS!!
Which of the following is not a mixture? lemonade fruit salad pure water cereal and milk
Answer:
pure water that's easy hope that helps
Please help me due in like 2 min
A model of the water cycle was made by adding a small amount of water into an aquarium, covering the aquarium with a piece of glass, and placing a lamp over the glass cover to add heat. What does the lamp represent when comparing this model to the real-life water cycle?
Clouds
Precipitation
The ocean
The sun
Answer: D) The sun
Explanation: