Answer:
b. Nuclear fission
Explanation:
Ai là nhà Hoá học nổi tiếng nhất ở Việt Nam? Ông đã có những đóng góp gì cho xã hội?
Answer:
Are you spraking Vietnamese?
Convert the following number from scientific notation to numerical notation:
9.9 x [tex]10^{7}[/tex]
What is the Systematic Name of the Following Compound?
TiCl₂
Choose 1 Answer:
tin(II) chloride
titanium (I) chloride
titanium (II) chloride
tin(I) chloride
Answer:
titanium (I) chloride
Explanation:
Tin has a chemical formular of "Sn"
[tex].[/tex]
A reaction that uses a catalyst:
Explanation:
In general, catalytic action is a chemical reaction between the catalyst and a reactant, forming chemical intermediates that are able to react more readily with each other or with another reactant, to form the desired end product.
I hope it's helpful!!
Calcium Bicarbonate + Calcium Carbonate =?
Please help
Answer:Calcium bicarbonate, also called calcium hydrogen carbonate, has the chemical formula Ca(HCO3)2. The term does not refer to a known solid compound;
calcium bicarbonate = calcium carbonate + water + carbon dioxide
Explanation:
Why do solids maintain their volume and shape? cause-effect
A.) Because they vibrate
B.)because they are packet tight
C.) because they are crystalline
B.)because they are packet tight
Answer:
Because they are packet tight.
Explanation:
Solids maintain their volume and shape because they are packet tight.
A solid's particles fit closely together. The forces between the particles are so strong that the particles can not move freely; they can only vibrate. This causes a solid to be a stable, non-compressible shape with definite volume.Why did the toads disappear
Answer: extremely sensitive to environmental changes caused by habitat destruction, climate change, pollution
Explanation:
Across the world, amphibians have been disappearing at an unprecedented rate — faster than any other group of animals. Frogs, toads, and salamanders are extremely sensitive to environmental changes caused by habitat destruction, climate change, pollution, and invasive species.
Nitrogen is also returned to the soil through animal _____.
wastes
habitats
gases
birth
Which location below would be considered a microhabitat
Answer: An overturned decomposing log or the underside of a rock in a stream are excellent examples of microhabitats. Both a habitat and a microhabitat have typical abiotic (e.g. water, temperature, light.
Explanation:
How does time needed for preparation Affect meal planning? Also I need this answer asap!
Answer:
Spending time preparing indicates a better diet,(eating veggies and fruits). The opposite if you spend no time or less than an hour preparing(you are more likely to spend money on fast food)
-If sulfuric acid (H2SO4) reacts with 29 grams of sodium chloride (NaCl), how many grams of hydrochloric acid (HCl) are produced? H2SO4 + NaCl > HCl + Na2SO4
- In the same reaction, how much salt (NaCl) is needed to produce 4.0 moles of sodium sulfate (Na2SO4)?
- In the same reaction, if you started with 100 moles of sulfuric acid (H2SO4), how many moles of hydrochloric acid (HCl) could you produce?
Explanation:
mole = mass/molar mass
mole of Nacl = mass/mm
molar mass of Nacl = Na + Cl = 23+35=58
mole of NaCl = 29/58
mole of NaCl = 0.5mol
H2SO4 + NaCl ====> HCl + Na2SO4
1. 1. 1. 1
since mole of NaCl is 0.2mol then mole of HCl is also 0.2mol since they are all in the same ratio
mole of HCl = Mole of NaCl = 0.5mol
mass of HCl = ?
molar mass of HCl = H + Cl = 1+ 35=36
mole of HCl = mass /molar mass
0.5= mass/36
mass = 0.5×36 = 18 grams
Under normal conditions, NaOH completely ionizes as: NaOH ->
NaO + H+. TRUE FALSE
NEED ANSWER ASAP
the answer is false because naoh does ionizes
Answer: False
Explanation:
Which group have spore- dispersing vascular plants? *
2 points
Thallophytes
Pteridophytes
Bryophytes
Gymnosperms
Using the process of elimination and understanding:
Thallophytes- non-vasular ❌ Pteridophytes- vascular spore-dispersing plant ✅ Bryophytes - non-vascular spore-dispersing ❌ Gymnosperms - produce cones (coniferophytes) ❌Pteridophytes (ferns) and the group of spore-dispersing vascular plants.
Spell all words correctly.
Which non-destructive technique is used for analyzing carpet fibers at a crime scene?
______________ is a non-destructive technique used for analyzing carpet fibers at a crime scene and preserving evidence in the original form.
( forensic science question)
Room temperature fluorescence spectroscopy is a non-destructive technique used for analyzing carpet fibers at a crime scene and preserving evidence in the original form.
In investigations, it is often necessary to preserve the physical integrity of evidence so that it can be presented in court. It therefore becomes important to use methods of analysis that are non - destructive when analyzing the material.
One of the most useful non - destructive methods of analysis is room temperature fluorescence spectroscopy. This method of analysis is accurate, yet preserves the physical integrity of evidence.
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Answer:
Spectrometry.
Explanation:
The long ridiculous answer the person gave before me doesnt even fit.
Write the formuler of the following organic compounds
1. 2-Methyl - 2-hyblroxy propane
2. 2-methylpropan-2-ol
3. Propanoic acid
4. Methyl ethanoate
5. Methyl Propanoate
6. 3-methylpeatane
7. 2-hydroxy panoic acid
Please help me asap
Answer:
All I know is these things hope they help u.
A quantity of gas has a volume of 2250 at a temperature of 45 C and a pressure of 650 torrWhat is the temperature (in °C) if the volume remains unchanged but the pressure is decreased to 565 torr?
Answer:
your answer is 769
Explanation:
i took the test lol
The pressure of a given amount of gas held at constant volume is directly proportional to the Kelvin temperature, according to Gay Lussac's Law. When you heat a gas, the molecules gain energy and move faster. This means more impacts on the container's walls and an increase in pressure.
The temperature at 565 torr = 276.5 K
What are gas laws?Gas laws are laws that relate a gas's pressure, volume, and temperature. Boyle's law, named after Robert Boyle, states that the pressure P of a gas varies inversely with its volume V at constant temperature, or PV = k, where k is a constant.Boyle's Law states that when the temperature and mass are both constant, the volume of a given amount of gas held at constant temperature varies inversely with the applied pressure.Charles' law states that if the pressure remains constant, the volume occupied by a fixed amount of gas is directly proportional to its absolute temperature.The pressure of a given amount of gas held at constant volume is directly proportional to the Kelvin temperature, according to Gay Lussac's Law. When you heat a gas, the molecules gain energy and move faster. This means more impacts on the container's walls and an increase in pressure.Avogadro's law states that equal volumes of different gases contain an equal number of molecules under the same temperature and pressure conditions.
The temperature = [tex]\frac{565 X 318.15}{650}[/tex] =276.5 K
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why is water able to easily dissolve ionic compounds
Answer:
Water is a covalently bonded molecule. H2O-> Oxygen and hydrogen are both nonmetals. Ionic compounds are made up of a nometal and metal which causes it to have electrical components. A covalent bond is stronger than an ionic bond, which allows water to break down ionic salts.
if equations are not balanced,what must you do?
If a chemical equation is not balanced it implies that either mass has been created or destroyed which is a contradiction to law of conversation of mass which states that matter can niether be created nor destroyed.
In order to balance the chemical equation, you need to make sure the number of atoms of each element on the reactant side is equal to the number of atoms of each element on the product side. In order make both sides equal, you will need to multiply the number of atoms in each element until both sides are equal.
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Charlotte's car averages 25 miles per gallon of gas. How many dal would she need to travel 3,241 hm?
Answer:
Around 129 galons
Explanation:
if you divied 3,241 by 4 you get 129 gallons but if you times that by 25 you get 3,225 so a little bit off but close.
Among the following compounds which are isomers?
I. CH3CH2-O-CH3 II CH3CH2CH2OH
III CH3CH2–0-CH2CH3 IV. CH2=CH-O-CH3
CH
3
CH
2
OCH
3
and CH
3
CH
2
CH
2
OH have different functional groups, hence, they are functional isomers.
For the reaction: CaO + SO3 → CaSO4, how many moles of CaSO4 are produced
from 40.0 g of SO3?
Answer:
here hope it helps can you mark me brainliest please
The number of
in the nucleus of an atom is the
atomic
of that element. Because atoms are
electrically neutral, the number of protons and
in an atom are equal. The sum of the
and neutrons is the mass number.
What’s the correct order it goes in
Answer:
The number of protons in the nucleus of an atom is the atomic number of that element. Because atoms are electrically neutral, the number of protons and electrons in an atom are equal. The sum of the protons and neutrons is the mass number.
Name an element that can be used to date back billions of years?
Using radiometric
Answer:
Uranium-238
Explanation:
Examples:
Original element Decay product Half-life (years)
Uranium-238 Lead-206 4.5 billion
Uranium-235 Lead-207 704 million
Rubidium-87 Strontium-87 48.8 billion
Can someone please help me with number five thank you!!
Answer:
multiply 7x.3048m and it =s 2.134 meters
Joe has a disease that his cells can't convert food energy effectively into energy they can use. He gets extremely tired as a result. Which organelle is affected by Joe's disease?
Answer:
Mitochondrion
Explanation:
Joe's cells can't convert food energy effectively into energy they can
use. As a result, he gets extremely tired, has weak legs, and can't
breathe well. Joe swims every day to keep his body as strong as
possible. Which organelle is affected by Joes disease
check: quizlet dot com. type in you question
What does the emission spectrum tell us about the structure of an atom?
Answer:
The emission spectrum of a chemical element or chemical compound is the spectrum of frequencies of electromagnetic radiation emitted due to an atom or molecule making a transition from a high energy state to a lower energy state. ...
Explanation:
Therefore, spectroscopy can be used to identify elements in matter of unknown composition.
Carbon is classified as which type of element?
Carbon is classified as a nonmetal.
Why doesn't Florida have as many earthquakes as California? Use evidence from the map to support your response.
Answer:
Florida is tied for first place as having the fewest earthquakes of any US state. Because Florida is not located near any tectonic plate boundaries like california.
Explanation:
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HELP!!!!! NO SPAM!!!!!!!!!!!!!!!!!
S + 6 HNO3 --> H2SO4 + 6 NO2 + 2 H2O
In the above equation how many moles of water can be made when 75 moles of HNO3 are consumed?
Let required moles be x
[tex]\\ \sf\longmapsto \dfrac{2}{6}=\dfrac{x}{75}[/tex]
[tex]\\ \sf\longmapsto \dfrac{1}{3}=\dfrac{x}{75}[/tex]
[tex]\\ \sf\longmapsto x=\dfrac{75}{3}[/tex]
[tex]\\ \sf\longmapsto x=25mol[/tex]
2moles of H2O are made when 6moles of HNO3 are consumed
75 mole of HNO3 produces = [tex]\frac{2}{6}[/tex]× 75 ⇒ 25 moles of water
Limiting Reagent MethodThe limiting reagent is the reactant that is completely used up in a reaction and thus determines when the reaction stops.
S + 6 HNO3 --> H2SO4 + 6 NO2 + 2 H2O
6 mole of HNO3 produces = 2 moles of H₂O
1 mole of HNO3 produces = [tex]\frac{2}{6}[/tex] mole of H₂O
∴ 75 mole of HNO3 produces = [tex]\frac{2}{6}[/tex]× 75 ⇒ 25 moles of water
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Which describes a molecule? (Select all that apply.)
It can be two or more of the same elements combined together.
It can be one element by itself.
It can be two or more different elements combined.
It can be the combination of different neutrons.
Answer:
a) It can be two or more of the same elements combined together.
A molecule is two or more atoms of the same element chemically combined.
Example is an oxygen molecule.
Molecules can be described as two or more of the same or different elements combined together. Therefore, options (A) and (C) are correct.
What is a molecule?A molecule can be described as a combination of two or more atoms that form the smallest unit into which the structure and chemical properties of that substance can be classified and preserved by a pure substance.
A molecule may be homonuclear if it consists of atoms of a single chemical element such as oxygen molecule (O₂) or it may be heteronuclear such as water (H₂O).
A molecule consists of an arrangement of atoms held together by the forces of valence. Two atoms that are chemically combined comprise diatomic molecules.
Heteronuclear diatomic molecules consist of two combined atoms of the same substance such as Carbon monoxide (CO), hydrochloric acid (HCl), etc.
Therefore, a molecule can consist of atoms of the same or different elements.
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