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,
Given the following information:
Heat of sublimation of Li(s) = 166 kJ/mol
Bond energy of HCl = 427 kJ/mol
Ionization energy of Li(g) = 520. kJ/mol
Electron affinity of Cl(g) = -2349 kJ/mol
Lattice energy of LiCl(s) = -2829 kJ/mol
Bond energy of H₂ = -432 kJ/mol
Calculate the net change in energy for the following reaction:
2Li(s) + 2HCl(g) --> 2LiCl(s) + H₂(g)
Answer:
Ya'll should really practice more because things like these are easy
Explanation:
You guys need to practice more since stuff like this are pretty simple.
What is net change?According to the net change theorem, the ultimate value of a quantity equals the beginning value plus the integral of the rate of change when a quantity changes. The net change can be positive, negative, or zero.The term "Net Change in Cash" indicates how much Cash and Cash Equivalents changed in value during the reporting period. It is the main punchline of the Cash Flow Statement. Net Cash Change quantifies how much the value of Cash and Cash Equivalents changed during the reporting period. The main punchline on the Cash Flow Statement is this. When using net cash as a barometer to determine a company's financial health, it is critical to analyse what activities contribute to positive or negative net cash.To learn more about net change refer to:
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please help me please please
Answer:
d
D
C
D
c
Explanation:
What is at the center of every atom?
an electron
a compound
a molecule
a nucleus
#2 - Which two particles make up the nucleus of an atom? *
protons and electrons
protons and neutrons
molecules and compounds
neutrons and electrons
#3 - What is the role of an electron in an atom? *
electrons live inside the nucleus and carry a neutral charge
electrons circle the nucleus and have a positive charge
electrons circle the nucleus and have a negative charge
electrons live inside the nucleus and have a negative charge
#4 - In an atom, what is the number of protons equal to? *
the number of electrons
the number of neutrons
the number of molecules
the number of nuclei
#5 - Which of the following determines the type of element that an atom makes? *
the size of the nucleus
the number of protons
how much the atom weighs
the number of neutrons
#7 - What is a compound? *
the center of an atom that is formed by neutrons, protons, and electrons
a tiny particle that makes up all matter
a molecule that is formed from two or more different types of atoms.
a molecule that is formed from the same type of atoms
The annswer are -
1. the center of an atom is a nucleus
2. protons and neutrons
3. electrons circle the nucleus and have a negative charge
4. the number of electrons
5. the number of protons
7. a molecule that is formed from two or more different types of atoms.
What is the explanation for these?1. The nucleus is at the center of every atom and contains protons and neutrons, while electrons orbit around the nucleus.
2. Protons and neutrons make up the nucleus of an atom, providing mass and stability.
3. Electrons circle the nucleus in specific energy levels and have a negative charge, playing a role in chemical bonding and interactions.
4. The number of protons in an atom is equal to its atomic number and determines the element it belongs to.
5. The number of protons in an atom specifically determines the type of element it represents.
7. A compound is a molecule formed from different types of atoms, combining chemically to create a new substance.
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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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What is the difference between electrical and light energy??
Answer:
Light energy is a form of electromagnetic radiation. Light consists of photons, which are produced when an object's atoms heat up. Light travels in waves and is the only form of energy visible to the human eye.
Electrical energy is a form of energy resulting from the flow of electric charge. Energy is the ability to do work or apply force to move an object. ... The movement of charged particles through a wire or other medium is called current or electricity.
I need help with my homework i don't understand nothing
Answer:
ok so im gonna go and do some for your latest questions then if thats alright with you
Explanation:
i need points so im trying to help as many people as i can before the end of the day.
but you have to make the questions forst so i can help you understand them
What is the molarity of a magnesium chloride solution with 90.5 g of MgCl2 dissolved in a solution with a total volume of 2300 mL?
Answer:
Molarity = 0.41 M
Explanation:
Given data:
Mass of MgCl₂ = 90.5 g
Volume of solution = 2300 mL (2300/1000 = 2.3 L)
Molarity of solution = ?
Solution:
Number of moles of MgCl₂:
Number of moles = mass/molar mass
Number of moles = 90.5 g/ 95.2 g/mol
Number of moles = 0.95 mol
Molarity:
Molarity = number of moles / volume in L
Molarity = 0.95 mol / 2.3 L
Molarity = 0.41 M
will mark a brainliest.
Which of the following is correct chemical formula for "di-carbon tetra-oxide?"
C204
C404
C05
C2 08
Answer:
The answer is actually CO4
Explanation:
prove me wrong
Answer:
C2O4
Explanation:
Di means 2 and tetra means 4
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 moles are in 5.32 x 1020 atoms
of copper?
What is the answer but in numbers ?
Answer is 1.41 x 10 with the exponent of 24, atoms
Explanation : Look at the picture i attached.
Radiation is when heat is transferred through
A.
the
air
B. the object
O
C. the sun
D. the liquid
Answer:
I think its C
Explanation:
because it travels from the sun to earth
Hey!!!! Hru? 13(4)+8(78)=x
Answer:
x=676
Explanation:
Answer:
x = 676
Explanation:
13*4 = 52
8*78 = 624
624 + 52 = 676
50% by mass of a 2.2 moles
mixture of He and Ar gasses .
Calculate the mole number of He
in the mixture?
Mol He in the mixture = 2
Further explanationGiven
50% by mass
2.2 moles of mixture
Required
The mole number of He
Solution
50% by mass⇒ mass of He : mass of Ar = 1 : 1
Mol He = 2.2 - mol Ar
mass He = mass Ar
mol x MW He = mol x MW Ar
(2.2-mol Ar) x 4 = mol Ar x 40
8.8 - 4 mol Ar = 40 mol Ar
8.8 = 44 mol Ar
mol Ar= 0.2
mol He = 2.2 - 0.2 = 2
Help ASAP give brainest if right And please hurry
Answer:
Conduction
Convention
Radiation
in that order
Answer:
Conduction
Convention
Radiation
Explanation:
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.
please help. thank you!
Find an interesting chemical reaction. It can be a simple one but please have some facts and info about it. Thank you!
Answer:
Elephant Toothpaste
When hydrogen peroxide and potassium iodide are mixed in proper proportions, the hydrogen peroxide decomposes very quickly.The soapy water traps the oxygen, a product of the reaction, and creates many bubbles. Foam is a kind of a mixture called a colloid - gas bubbles in a liquid.It produces foam but it also can produce heat.Extra
Make Elephant Toothpaste
Pour 1/2 cup hydrogen peroxide solution, 1/4 cup dishwashing soap, and a few drops of food coloring into the bottle. Swish the bottle around to mix the ingredients. Set the bottle in a sink or outdoors or some other place where you won't mind getting wet foam everywhere.
In a separate container, mix a packet of active yeast with a little warm water. Give the yeast about five minutes to activate before proceeding to the next step.
When you are ready to do the demo, pour the yeast mixture into the bottle. The reaction occurs immediately upon the addition of the yeast.
I don't know if this will help but here you go.
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
For each claim below, select whether you think this claim is supported by evidence or not. Elisa is feeling tired because she has diabetes. Elisa is feeling tired because she has anemia. Elisa is feeling tired because she has an injury to her pancreas. Elisa is feeling tired because she has asthma.
Answer and Explanation:
Elisa is feeling tired because she has diabetes - suported: diabetes, in fact, can trigger episodes of extreme tiredness in patients, this tiredness may have been accompanied by dizziness and being.
Elisa is feeling tired because she has anemia. - Supported: Anemia hampers the transmission of oxygen in the blood, which can cause tiredness, weakness and extreme fatigue.
Elisa is feeling tired because she has an injury to her pancreas - suported: The pancreas is responsible for the production of insulin which is essential to prevent diabetes from establishing itself in the body. If the pancreas is damaged, insulin may be insufficiently produced, increasing the chance of developing diabetes and causing tiredness.
Elisa is feeling tired because she has asthma - suported: asthma causes breathing difficulties, this can cause tiredness and fatigue.
What is the sum of the coefficients needed to balance the combustion reaction of methane?
Answer: The sum of the coefficients needed to balance the combustion reaction of methane is 6.
Explanation:
Combustion is a chemical reaction in which hydrocarbons are burnt in the presence of oxygen to give carbon dioxide and water.
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
The chemical equation for combustion of methane will be :
[tex]CH_4+2O_2\rightarrow CO_2+2H_2O[/tex]
The coefficient foer methane is 1 , 2 for oxygen , 1 for carbon dioxide and 2 for water. The sum is 6.
Which of the following is a challenge to democracy shared by both Brazil and Mexico?
A.
People have no economic freedoms.
B.
People accused of a crime have few protections.
C.
Most people do not have the right to vote.
D.
Crime and corruption are serious problems in government.
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What is different about the atomic structure of the oxygen isotopes?
Answer:
Each isotope of oxygen contains 8 protons, but differs in the number of neutrons. An isotope number is a shorthand representation of its mass. Because protons and neutrons are roughly equal in mass, an isotope's number is equal to the sum of its protons and neutrons.
Explanation:
Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.
12 gram of magnesium carbonate is heated till no for the loss of heat the final mass was found to be 5.28 gram how much CO2 gas was given out
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.
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:
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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Convert to standard notation.
3.94 x 10^7
Answer:
Standard Notation:39,400,000
Explanation:
3.94*10^7= 39,400,000
the answer is 39400000x
Choose the COEFFICIENTS that balance the equation by the inspection method.
Answer:
somebody please help her or him please please
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.
what is the mass of 3.20x10^23 formula units of iron (III) oxide (Fe2O3)?
The mass of iron (III) oxide (Fe2O3) : 85.12 g
Further explanationGiven
3.20x10²³ formula units
Required
The mass
Solution
1 mole = 6.02.10²³ particles
Can be formulated :
N = n x No
N = number of particles
n = mol
No = 6.02.10²³ = Avogadro's number
mol of Fe₂O₃ :
[tex]\tt n=\dfrac{3.2.10^{23}}{6.02.10^{23}}=0.532[/tex]
mass of Fe₂O₃ (MW=160 g/mol)
[tex]\tt mass=mol\times MW=0.532\times 160=85.12~g[/tex]
We have 84.84g of Fe[tex]_2[/tex]O[tex]_3[/tex] in 3.20*10^23 particles.
Data;
number of particles = 3.20*10^23molar mass = 159.69g/molAvogadro's number = 6.023*10^23 particles.To solve this problem, we need to relate Avogadro number to the molar mass.
From molar mass - Avogadro's number relationship;
[tex]159.69g = 6.023*10^2^3\\xg = 3.20*10^2^3\\x = \frac{159.69*3.20*10^2^3}{6.023*10^2^3} \\x = 84.84g[/tex]
From the above calculations, 84.84g of Fe[tex]_2[/tex]O[tex]_3[/tex] is present in 3.20*10^23 particles of Fe[tex]_2[/tex]O[tex]_3[/tex].
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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.