how many elements are in 2CaCO3 pls help
Answers
In 2CaCO3 there are 3 elements
I hope that helped you! If you have any further questions comment down below or message me! Good luck!
Related Questions
How do American cities now protect their water resources
Answers
Answer:
They can use man made materials or they can also have designed areas that people can’t go into
Explanation:
10) Intravenous saline solutions have a concentration of 1.5 M NaCl. How many liters of saline can be prepared from 50.0 g of NaCl?
Answers
Answer:
0.57 mol/L
Explanation:
Molarity (M) is defined as the number of moles of solute per liter of solution (moles/Liter).
Molarity = [tex]\frac{moles of solute}{liters of solution}[/tex] or Moles = molarity × litres
so, the mass of Nacl in 1 mol is 58.44 g,
Moles of NaCl = 50.0g x 1 mole NaCl / 58.44 g
= 0.855 mol NaCl
Moles = molarity × litres
0.855 = 1.5 M x L
L = 0.57 mol/L
Hence, 0.57 mol/L can be prepared from 50.0 g of NaCl.
The map shows the main streams and the the rivers near City A and City B, as well as the nearby factories and farmland, The arrows in
the diagram show the direction of the water flow. City A gets its water from the sunset River and City B gets its water from the Moth Lake. A liquid herbicide was applied to a farmland. What is the greatest risk of using the herbicide?
Select One:
It will pollute the water source for the city A
It will pollute the air for the City B
It will pollute the water source of city B
It will pollute the air for the city A
Answers
Answer:
c
Explanation:
the map shows water near the factories go into moth lake so all of the waist will end up there
The balloon in this image was rubbed with a piece of wool material. Now, it is negatively charged. What force allows the charged balloon to "pick up" the small pieces of paper off of the table?
The negatively charged balloon is attracted to negative static charges in the paper..
The negatively charged balloon is attracted to the north pole of the paper pieces.
The negatively charged balloon is attracted to the south pole of the paper pieces.
The negatively charged balloon is attracted to the positive static charges in the paper.
What is the best explanation of electric current in a wire?
Electrons build up in the wire and create a charge.
Electrons flow because of electrical attraction and repulsion.
Protons are pushed along by electric forces.
Atoms move because of heat.
Why does the light bulb in a circuit turn on when you close the switch?
The switch absorbs the electrical energy.
The switch changes the direction of the flow of electrons.
Closing the switch completes the circuit, making it a closed circuit.
The switch changes the circuit from series to parallel.
Earth is dipolar, like a bar magnet.
What does this mean about its magnetic poles?
There is only a magnetic south pole.
There is only a magnetic north pole.
There are both magnetic north and south poles.
There are two magnetic north poles.
Which arrangement described below would result in magnetic poles that attract one another?
North Pole + South Pole
South Pole + West Pole
East Pole + North Pole
North Pole + North Pole
Why is an electromagnet a temporary magnet?
An electromagnet only attracts other permanent magnets.
An electromagnet becomes a magnet when a current flows through the wire. An electromagnet no longer acts as a magnet when the current flow stops.
An electromagnet cannot be turned on and off.
An electromagnet is a magnet when no current flows through the wire. The electromagnet no longer acts as a magnet when current flows through the wire.
What set of materials listed below could be used to create a complete electromagnet?
wires and battery
iron nail and battery
iron nail, magnet, and wire
battery, iron nail, copper wire
Where is a bar magnet's magnetic field the strongest?
red part of the magnet
longest part of the magnet
magnetic poles (N + S)
center of the magnet
A(n) ___________ is represented in the diagram it converts electrical energy into mechanical motion.
generator
electromagnet
parallel circuit
motor
Answers
Answer:
I actually have no idea
Explanation:
Sorry my man
Answer:
Explanation:
generator
What volume of 0.125 M HCl is needed to titrate 50.0 mL of 0.0500 M NH3 solution ?
Answers
Answer:
20
Explanation:
How is the atmospheric oxygen that is taken in by living things for respiration replaced?
A) After living things use oxygen for respiration, they exhale the oxygen back to the atmosphere.
B) Photosynthesis uses the carbon dioxide that is exhaled by living things to make oxygen.
C) Weathering releases oxygen that is locked in rocks due to sedimentation.
D) Oxygen that is dissolved in water such as oceans is released.
Answers
Organisms using photosynthesis take in oxygen and release carbon dioxide (ex: plants)
Answer:
B.) Photosynthesis uses the carbon dioxide that is exhaled by living things to make oxygen.
Explanation:
Ca(OH)2
Name this compound according to IUPAC nomenclature.
A) calcium hydroxide
B) calcum oxide hydride
C) calcium (II) hydroxide
D) calcium (II) oxide hydride
Answers
What’s the two products of H2Co3
Answers
Answer:
Hydrogen and Cobalt
Explanation:
Break up each individual element
- Hope that helps! Please let me know if you need further explanation.
A neutralization reaction has what two reactants?
A — acid and base
B —- hydrocarbon and water
C— acid and salt
D—hydrocarbon and base
Answers
Answer:
it's a, acid and base
Explanation:
a neutralization reaction occurs between strong acids and strong bases and result in the formation of a salt and water
I’ll give Brainliest to the first answer
The amount of elements on the reactants side of an isolated equation are ___________ the amount of __________ that are formed on the ________ side. *
A)close to, ice crystals, cold
B)less than, properties, chemical
C)equal to, elements, products
D)similar, molecules, present
E)more than, elements, products
Answers
Answer:
C. equal to, elements, products
Explanation:
I took a quiz and it said this was right
in a titration 20.0 mL of 0.150 M NaOH(aq) Solution exactly neutralize is 24.0 mL of an HCl solution what is the concentration of the HCl solution
Answers
Answer:
0.125
Explanation:
i took a test and got it right choosing this answer hopes this help
The ___________________ is an early theory which states that our solar system was formed by the gravitational collapse of a massive giant cloud.
A) Nebular Theory
B) Capture Theory
C) Proto-planet Theory
D) Schmidt-Lyttleton accretion theory
Answers
Answer: A) Nebular Theory
Explanation:
Answer:
A)
Explanation:
please help me please
Answers
Answer:
b
Explanation:
i read this once and remember,trust me!
Answer:
20 is b and 21 is a.
what is the compound of libr
Answers
Answer:
Lithium Bromide
Explanation:
Answer:
El bromuro de litio es un compuesto químico de litio y bromo. Su carácter higroscópico extremo hace que LiBr sea útil como desecante en ciertos sistemas de aire acondicionado.
Explanation:
Ms. Clark is teaching her class about how plants make food for themselves. On the board, she has written this: __________ + air + water = food for plants
Answers
Answer:
sunlight
Explanation:
HELP CHEM ASAP!!!!!!
Answers
Answer:
0.132
Explanation:
is the only part i know
The half-life of gold-198 is 2.7 days. After
amount of gold-198 will remain.
days, 1/4 of the original
Answers
Answer: 8.1 days
Explanation:
Expression for rate law for first order kinetics is given by:
[tex]t=\frac{2.303}{k}\log\frac{a}{a-x}[/tex]
where,
k = rate constant
t = age of sample
a = let initial amount of the reactant = x
a - x = amount left after decay process= [tex]\frac{x}{4}[/tex]
a) to find rate constant
Half life is the amount of time taken by a radioactive material to decay to half of its original value.
[tex]t_{\frac{1}{2}}=\frac{0.693}{k}[/tex]
[tex]k=\frac{0.693}{2.7days}=0.257days^{-1}[/tex]
b) for completion of one fourth of reaction
[tex]t=\frac{2.303}{k}\log\frac{x}{\frac{x}{4}}[/tex]
[tex]t=\frac{2.303}{0.257}\log{4}[/tex]
[tex]t=8.1days[/tex]
Thus after 8.1 days , one fourth of original amount will remain.
Help Chem asap!!!!! Brainslist
Answers
Answer:
OH-
Explanation:
Sulfuric acid (H2SO4) has a molar mass of 98.1 g/mol. How many oxygen atoms are found in 75.0 g of H2SO4? A. 1.15 × 10^23 B. 1.84 × 10^24 C. 4.61 × 10^23 D. 7.87 × 10^23
Answers
Answer:
B
Explanation:
first find the no. Of moles of H2SO4
= 75/98.1
= 0.7645
Next step
In on mole of H2SO4 the no.of oxygen atom is 4.
1 H2SO4 : 4 O
0.7645 : x x= 0.7645x4= 3.0581
next multiply avogadros constant
3.0581 x 6.022× 10^23 =1.84x10^24
Mass present in 1 gram of mole substance is called molar mass. Molar mass is calculated by: dividing the mass of the compound in grams by the number of moles present in the substances.
The correct answer is:
option B. 1.84 × 10²⁴
Given,
The mass of sulfuric acid =75.0 gThe molar mass of sulfuric acid = 98.1 g/mol
1.The moles of sulfuric acid can be calculated by
M = m ÷ n
where M is molar mass, m is mass and n moles.
moles of sulfuric acid = mass ÷ molar mass
= 75 g ÷ 98.1 g/mol
=0.7645 moles
Hence moles of sulfuric acid present is 0.7645 moles.
2. 1 mole of sulfuric acid = 4 oxygen atoms.
Then, 0.7645 moles of sulfuric will contain: 0.7645 × 4 = 3.0581 atoms of oxygen
3. Oxygen atoms present in 75.0 g of H₂SO₄ will be calculated by multiplying it with Avogadro's constant:
= 3.0581 x 6.022× 10²³
= 1.84x10²⁴
Therefore, 1.84 × 10²⁴ oxygen atoms will be found in 75.0 g of H₂SO₄.
To learn more about moles follow the given link:
https://brainly.com/question/20486415
Question 2 options: The Galápagos tortoises are native to seven of the Galápagos Islands, a volcanic archipelago about 620 miles west of the Ecuadorian mainland. With lifespans in the wild of over ____________years, it is one of the longest-lived vertebrates. A captive individual lived at least ______________years!
Answers
Answers:
in the wild of over 100 years,...
A captive individual lived at least 255 years!
Explanation:
The giant Galapagos tortoises (Chelonoidis nigra) are famous because this species was observed by Darwin during his travel. This species is native from the Galapagos Islands and currently is in danger of extinction. Galapagos tortoises are recognized as one of the longest vertebrates. In this regard, it is worthy to note that a giant tortoise named Harriet lived 255 years, this specimen was in the Australian Zoo.
Which pair of elements would combine to form an ionic compound?
а
b
sodium and calcium
sodium and chlorine
carbon and oxygen
carbon and sulfur
с
d
Answers
sodium and chlorine Because Sodium and chlorine make Salt which are ionic compound.
PLS HELP
In the balanced equation:
H3PO4(aq) + NH3(aq) ↔ X(aq) + NH4+(aq)
The particle represented by X(aq) is
A) H2PO4–(aq)
B) HPO42–(aq)
C) PO43–(aq)
D) H3PO4(aq)
Answers
Answer:
The particle represented by X(aq) is A) H₂PO₄⁻(aq)
Explanation:
According to the Brønsted-Lowry Theory, a base is a substance capable of accepting protons (H⁺) in solution. Conversely, a substance acts as an acid if it acts as a proton donor.
A proton transfer then occurs, requiring the presence of a proton donor (an acid) and a base that accepts them.
When an acid gives up a proton, it becomes an anion, generating a conjugate base. That is, a conjugate base is an ion or molecule resulting from the acid that loses the proton. Conversely, a conjugated acid is an ion or molecule resulting from the base that the proton gains.
In this NH₃ / NH₄⁺ pair that NH₄⁺ is the conjugate acid of the NH₃ base, the latter acting as a base since it accepts a proton. H₃PO₄ then acts as an acid, yielding a proton and generating the conjugate base H₂PO₄⁻.
So, the particle represented by X(aq) is A) H₂PO₄⁻(aq)
Picture of 2010 Todd Abronowitz Gas Laws problems, super fun if you’re in AP chem. Can you help a pre-AP struggling student out please?
Answers
Answer:
1. 0.422 atmospheres
2. 633281.25 Pascals
3. (a) Move up
(b) 868 mmHg
4. 868 mmHg
5. 775 mmHg
6. Partial pressure of He is 0.64 atm.
Partial pressure of oxygen is 1.29 atm.
Partial pressure of N is 2.57 atm.
7. 445.72 torr.
Explanation:
1. To convert 321 torr to atmospheres
1 atmosphere = 760 torr
∴ 1 torr = 1/760 atmospheres
Hence, 321 torr = 321 × 1/760 = 321/760 atmospheres = 0.422 atmospheres
2. To convert 6.25 atmospheres to Pascals, we have;
1 atmosphere = 101325 Pascals
∴ 6.25 atmospheres = 6.25 × 101325 Pascals = 633281.25 Pascals
3. (a) Here we have, given that the value of the pressure on the bottle = 830 mmHg, when the valve is opened, the mercury in the open-end arm will move up because the pressure of the gas inside the flask is more than the pressure on the other side of the open-end arm
(b) After the mercury stops moving the difference between the two columns will be the difference between the two pressures, that is 830 mmHg - 745 mmHg = 85 mmHg
4. From the diagram, it is seen that the differenc beteen the two columns is 123 mm, therefore, the pressure in the flask is 123 mmHg more than the external pressure, hence the pressure of the as in the flask = 745 mmHg + 123 mmHg = 868 mmHg
5. Here we have that the height of the mercury in the open-end is less than the height of the mercury on the arm closer to the flask, therefore, the pressure of the gas in the flask = 825 mmHg - 50 mmHg = 775 mmHg
6. Number of moles of He = 1 mole
Number of moles of oxygen, O = 2 mole
Number of moles of nitrogen, N = 4 mole
From Dalton's law of partial pressure we have that, the total pressure of a given mass of gas is equal to the partial pressure of the individual gases
[tex]That \ is \ \chi _i = \frac{n_i}{n_{total}} \ and \ P_i = \chi_i \cdot P_{total}[/tex]
Hence;
Total number of moles = 1 + 2 + 4 = 7 moles
Mole fraction of He = 1/7
Partial pressure of He = 1/7×4.5 = 0.64 atm.
Mole fraction of oxygen, O = 2/7
Partial pressure of oxygen= 2/7×4.5 = 1.29 atm.
Mole fraction of N = 4/7
Partial pressure of N = 4/7×4.5 = 2.57 atm.
7. From Boyle's law
P₁×V₁ = P₂×V₂
Hence;
P₂ = P₁×V₁/V₂
Where:
P₁ = Initial pressure = 2.57 atm
V₁ = Initial volume =1.57 liters
V₂ = New volume = 6.88 liters
P₂ = New pressure = 2.57×1.57/6.88 = 0.59 atm.
To convert 0.59 atm. to torr, we multiply by 760 thus;
0.59 atm. = 0.59 × 760 torr = 445.72 torr.
People who live in hot, dry climates often rely on _________________________ for their drinking water
Answers
Answer:
People who live in hot, dry climates often rely on desalination plants for their drinking water.
Explanation:
This is your answer.
Explain the effects that different frequencies of electromagnetic radiation have when absorbed by matter.
Answers
We can think about it as two oscillating sinusoidal (goes up and down) waves, one is electric, the other is magnetic.
Because we’re dealing in waves, that means we can calculate their frequency, wavelength, amplitude (brightness) and period.
To calculate it we can use E=hc/lambda
Where E = jewels of energy
h = Planck’s constant
c = speed of light
Lambda = wavelength
It doesn’t really matter for this question what those things mean, just note that it takes more energy to have a shorter wavelength, or less energy to have a longer wavelength.
So now we can answer the question. Light of a longer wavelength has less energy than that of a shorter wavelength. So, when long wavelengths are absorbed by matter (atoms) they will give those atoms less energy. So, either it will pass through the object entirely or it will make the atoms vibrate a little bit more than they already are and we call that thermal energy, or heat.
If high energy wavelengths are passing through matter then they will be giving those atoms a lot of energy, sometimes even ionizing the atoms.
Which, if you’re a living thing can be very bad for your cells.
I hope that helps.
As the frequency of the radiation increases further, into the visible light spectrum, it can cause electronic transitions in atoms and molecules, leading to the emission of light and other optical effects.
What is electromagnetic radiation?Electromagnetic radiation is a form of energy that travels through space in the form of waves, without the need for a medium to propagate. It is characterized by oscillating electric and magnetic fields that are perpendicular to each other and the direction of propagation.
At low frequencies, such as radio waves and microwaves, the radiation typically only causes heating of the matter, as it transfers energy to the molecules in the material.
At higher frequencies, such as infrared radiation, the radiation can cause vibrations in the atoms and molecules of matter, leading to heating and thermal effects.
Thus, When matter absorbs electromagnetic radiation, the effects that it has on the matter depend on the frequency of the radiation.
To learn more about the electromagnetic radiation, follow the link:
https://brainly.com/question/10759891
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(Multiple Choice, 30 pts)
A student wants to determine whether an unknown solid is an ionic compound. He puts some in water and finds that it does not dissolve. He says that this proves the solid is ionic. Which best evaluates the student's reasoning?
A. He is incorrect, because water can dissolve ionic solids.
B. The test proves nothing, because water dissolves all solids.
C. He is correct, because polar liquids cannot dissolve ionic solids.
D. The test proves nothing, because it only shows that the solid is a compound.
(I know water is polar, so I think its a?)
Answers
The student cannot prove that if the compound is ionic or covalent because not all ionic compounds dissolves in water. Some ionic compounds have higher lattice energy results in lower solubility. Thus, option D could be correct.
What are ionic compounds?Ionic compounds are formed between metals and non metals. Metals are electron rich and they easily donate electrons to the non-metals. Non-metals are generally electronegative and they easily gains electrons from the metals.
Donating electrons make metals acquire positive charge and the non-metals acquire a negative charge. This charge separation make the compound possess a permanent dipole moment. Which make them easily soluble in water by ion-dipole interaction.
However, some ionic compounds have very strong ionic bonds and their binding energy will be greater so that cannot be easily dissolved in water. For example, AgCl. Therefore, we cannot predict weather the compound is ionic or not by simply noting it solubility in water.
To find more on ionic compounds, refer here:
https://brainly.com/question/9167977
#SPJ3
Discribe how an internal combustion engine works. What is drawback to the type of power?
Answers
Answer:
An internal combustion engine is a heat engine in which the combustion of a fuel occurs with an oxidizer in a combustion chamber. The force of combustion is converted into mechanical energy through the use of levers and gears. The by products of combustion include energy, water vapor, carbon dioxide (CO2), nitric oxide (NO), nitrogen dioxide (NO2), and carbon monoxide (CO). The two primary drawbacks to the internal combustion engine are the primary energy source is non-renewable (fossil fuels) and the by products can have damaging effects on the environment.
Explanation:
help me name these molecules please
Answers
Answer:
1. carboxylic acid
2. ether
3. ester
4. aldehyde
5. ketone
6. amine
7. alcohol
Explanation:
Know the functional groups. If you would like to learn them, let me know.
- Hope that helps! Please let me know if you need further explanation.
Which has the highest rate of effusion oxygen or hydrogen
Answers
Answer:
Hydrogen has the highest rate of effusion
Identify three details for how the Earth and Moon are different
Answers
2.Earth has oxygen moon does not.
3. Moon is not known to have life
