Answer:
Since the water is heavier, it displaces the lighter ice,
Explanation:
hope that helps
Name these compounds according to IUPAC. (ASAPP)
Propanal and acetone are the IUPAC names for the chemical.
What is the difference between propanal and acetones?Propanal, commonly known as propanaldehyde, is an aldehyde with one double bond and one oxygen atom.
Acetone is a ketone compound. R2CO is the functional group of ketones.
Thus, Propanal and acetone are the IUPAC names for the chemical.
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30. Which of the following substances would depress the freezing point of pure water the most?
a.
NaCl
c.
C6H12O6
b. MgCl₂
d.
K3PO4
Answer:
D. K3PO4
Explanation:
K3PO4 would dissolve into 3 potassium ions and one phosphate ions thus total of 4 items added in water. Freezing point is depressed by high amounts of stuff. NaCl would add 2 items (one Na and one Cl). Glucose would not break apart, thus 1 item. MgCl2 would break into One Mg and two Cl ions (thus 3 things.)..
Overall, K3PO4 dissolves into most components, thus would depress the freezin point most.
Scientists hypothesize that Earth's first oceans were made of fresh water. How did oceans obtain fresh water?
*
1 point
Water vapor in the early atmosphere cooled and fell to Earth as rain.
Frozen comets that fell to Earth melted as they traveled through the atmosphere.
As soon as icecaps formed, they melted because Earth was still very hot.
Early terrestrial organisms exhaled water vapor, which condensed to form fresh water.
The earth's first oceans would have obtained freshwater as a result of the condensation of water vapor in the atmosphere back then.
How were oceans formed?The freshwater of oceans was hypothesized to have been formed by the condensation of water vapor present in the early atmosphere of the earth.
The water vapor was thought to have emanated from volcanic activities. The condensation was in the form of rain and the resulting puddles merged together to form the oceans.
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What is the compound N₂O called?
Answer:
I believe its preferred to as "Laughing Gas." It's also called, Nitrous Oxide.
- CH₂ - CH₂ - CH₂
–
2
3
I
CH₂
CH₂-CH₂
CH₂
O 2,3-dimethylpentane
O2-methyl-3-methylpentane
O2,3-methylpentane
O 2-methyl-3-ethylbutane
Answer:
2,3-dimethyl pentane.........
distance in space is measured in
ammonia and hydrogen fluoride both have unusually high boiling points due to
Answer:
hydrogen bonding, hope this helps
Explanation:
Evaluate which factor is most likely to cause the concentration of greenhouse gases in the earth's atmosphere to increase?
A.
decreased number of decomposing plants
B.
decreased number of volcanic eruptions
C.
increased frequency of earthquakes
D.
increased human industrial activities
Answer:
D. increased human industrial activities
The conjugate base of a strong acid will always . . .
be acidic
be basic
be a spectator
fossil fuel in a sentence
biomass in a snentence
Answer:
Below•
Explanation:
Fossil Fuel: It's a natural gas based on natural materials such as coal.
Biomass: It's the total weight of substance.
[tex] \qquad \qquad...[/tex]
2. What is evolution?
Explanation:
Evolution is a biological process. It is how living things change over time and how new species develop.
Answer: It’s B
Explanation:
The radioactive decay of Uranium-238 releases alphas particles and results in a mass change of 0.135 g. Determine the amount of energy released by this reaction
a) 1.22 x 10^13J
b) 1.22 x 10^16J
c) 4.05 x 10^4J
d) 4.05 x 10^7J
This question involves the concept of binding energy.
The amount of energy released by this reaction is "a) 1.22 x 10¹³ m/s".
What amount of energy is released?The amount of energy that is released during the radioactive decay of any element is known as binding energy. This can be given by using the following formula:
[tex]E=\Delta mc^2[/tex]
where,
E = energy released = ?Δm = mass change = 0.135 g = 1.35 x 10⁻⁴ kgc = speed of light = 3 x 10⁸ m/sTherefore,
E = (1.35 x 10⁻⁴ kg)(3 x 10⁸ m/s)²
E = 1.22 x 10¹³ m/s
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The radioisotope that has the longest half-life is the best to use in powering planet and space exploration vehicles because they can travel farther. which radioisotope is the best to use? lithium-5 uranium-240 carbon-14 plutonium-239
The best radioisotope to use in powering planet and space exploration is plutonium-239 since it has the longest half-life of 21400 years.
What is Half-Life of radioactive element?The half-life ofa radioactive element is the time it takes for half the amount of atoms in the element to spontaneously decay.
The half-life of radioactive elements vary.
The half life of the given radioactive elements are as follows:
lithium-5 is 3.038×10^-22 secondsuranium-240 is 14.1 hours carbon-14 is 5700 years plutonium-239 is 21400 yearsTherefore, the best radioisotope to use in powering planet and space exploration is plutonium-239 since it has the longest half-life of 21400 years.
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Answer:
D. ) Plutonium-239
Four patients have been diagnosed with medical issues. A 2-column table with 4 rows. The first column labeled Patient has entries Josh, Ashley, Ron, Lindsay. The second column labeled Issue has entries sprained finger, pregnant with an under developed fetus, kidney stones, cancer in the tissues lining the uterus. Which patients could be best helped using ultrasound technology? Josh, Ashley, and Lindsay Josh Ron Ashley, Ron, and Lindsay
Answer:
Ashley, Ron, and Lindsay
Explanation:
Ultrasound technology is used for medical purposes by a scanning machine that allows to obtain living images of the inside of the body. For the type of issues they are going trough, ultrasound technology would help patients Ashley, Ron, and Lindsay. Ashley's under-developing fetus, Ron's kidney stones and, Lindsay's uterus cancer can be monitored by using ultrasound technology.
The ultrasound technology is a medical tool which can help a physician to evaluate, diagnose and treat medical conditions. Here the patients with Ron, and Lindsay kidney stones and cancer can be detected by ultrasound technology. The correct option is D.
What is cancer?A term for the disease in which the abnormal cells divide without control and can invade nearby tissues is defined as cancer. The cancer cells can also spread to the other parts of the body through the blood and lymph systems.
Kidney stones are the hard deposits made of minerals and salts which form inside our kidneys. It is mainly caused due to little drinking of water, obesity, eating food with high salt or sugar content.
The ultrasound technology can detect cysts, tumors, obstructions or infections within or around your kidneys. It is also used by the medical professionals for many purposes including the pregnancy related problems.
Thus the correct option is D.
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What substances had lower thermal conductivity, metal,
wood, or plastic
Answer: plastic
Explanation:
The thermal conductivity of a material is highly depending on composition and structure. Generally speaking dense material such as medals and stone are good conductors of heat while load density substances such as gas and porous installations are poor conductors of heat
Answer:
Or plastic
Explanation:
May be useful................
What is the OH- in a solution with a pOH of 7.68?
Answer:
Explanation:
Answer: 1.380 × 10^-8 M
The pH is the measure of alkalinity or acidity of a substance.
It is the negative logarithm of H+ ions concentration [H+].
pH = -log[H+]
pOH on the other hand is negative logarith of OH- concentration [OH-].
pOH = -log[OH-]
In this case;
pOH = 7.86
We can calculate the [OH-]
pOH = -log[OH-]
But, pOH = 7.86
pOH = -log[OH-]
-log[OH-] = 7.86
[OH-] = Antilog -7.86
= 1.380 × 10^-8 M
Therefore, [OH-] is 1.380 × 10^-8 M
a.
Convert these temperatures to Kelvin:
A. -22 °C
b. 206 °C
C. 50 °C
d. 8 °C
Like this
-22°C + 273.15 = 251.15K
206°C + 273.15 = 479.15K
50°C + 273.15 = 323.15K
8°C + 273.15 = 281.15K
Using the rxn below determine the following: What is the limiting reagent, theoretical yield of nitic oxide, and how many grams of excess reagent remain when producing nitric oxide when using 4.65g of ammonia to react with 4.25g of oxygen?
5 mols of O_2 need 4 mol NH_3
As mols of ammonia are less Ammonia is limiting reagentNow
Moles of Ammonia
Given mass/Molar mass4.65/170.3molMoles of NO=0.3mol
Mass of NO
0.3(30)9gSo
Moles of Oxygen
4.25/320.13molRemaining moles
0.3-0.13=0.17Mass
0.17(32)5.44gYield
5.44-4.250.79gWhich organisms are producers?
Choose all correct answers.
tree
grass
monkey
mold
Answer: Tree and Grass are the two correct answers here
Explanation: Producers are photosynthesizing organisms. They are any kind of green plant that make their food by taking sunlight and using the energy to make sugar.
Answer:
Tree, grass
Explanation:
Producers make their own food. Trees and grass can make their own food using sunlight (photosynthesis). Monkey is consumer (eats other things like bananas- made by plants - for survival). Mold (like fungus) eat dead stuff and thus are decomposers (not producers).
What is the IUPAC name
HCl(acid)+C₄H₈ (butene)⇒ addition reaction
name of the product: 2-cloro butane
Which part of the cell was most directly responsible for the shrunken appearance of the cell?
If a cell is placed in a hypertonic solution, water will leave the cell, and the cell will shrink.
What is osmosis ?
Osmosis is the net movement of water across a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration.
This may sound odd at first, since we usually talk about the diffusion of solutes that are dissolved in water, not about the movement of water itself.
If a cell is placed in a hypertonic solution, water will leave the cell, and the cell will shrink.
In an isotonic environment, there is no net water movement, so there is no change in the size of the cell.
When a cell is placed in a hypotonic environment, water will enter the cell, and the cell will swell.
Therefore If a cell is placed in a hypertonic solution, water will leave the cell, and the cell will shrink.
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A student mixed two chemicals to allow them to
react. The temperature before the reaction was 25
°C. The temperature after the reaction was 50° C.
Which of the following is true?
A. there was no change in heat energy
B. it is an exothermic reaction
help plsssss
Answer:
B .it is an exothermic reaction
Explanation:
i need brainleyest
24. Explain why a saturated solution is not necessarily a concentrated solution.
Answer:
A saturated solution may not be a concentrated solution IF the solute is only sparingly or slightly soluble in the solution.
The specific heat capacity of water is 4.184 J/gC. The specific heat capacity for ethanol is 2.46 J/gC. If both liquids start at the same temperature and exactly 30J of heat are added to each, which liquid's temperature will increase more
Answer:
ethanol
Explanation:
it is a thermometric liquid
Name these compounds according to IUPAC.
Functional groups are the specific groups that provide characteristic properties. The compounds are butanoic acid and methyl propanoate.
What are functional groups?Functional groups are the active side atoms and molecules that confer the physical and chemical properties of the compound. In the first compound, the functional group is the carboxylic acid (COOH) and four carbon atoms hence, the compound is butanoic acid.
In the second compound, the functional group is an ester (RCOOR) and contains a methyl group and other three carbon atoms making the compound, methyl propanoate.
Therefore, the compounds are butanoic acid and methyl propanoate.
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HELP QUICKLY PLEASEEE
Answer:
Ionic bonds are when electrons are gained/lost. Hence the valence charges.
What is a network solid?
a
A. A crystalline solid held together by intermolecular forces
B. A crystalline solid held together by charge attractions
C. A crystalline solid held together by metallic bonds
O D. A crystalline solid held together by covalent bonds
SUBMIT
Network solids are chemical compounds that are bound together by a covalent bond. Thus, option D is accurate.
What are covalent bonds?Covalent bonds are the type of chemical bonds that mutually shares electrons between the atoms of the molecules of the compound.
A covalent crystal of network solids is held together by the covalent bond that can be seen in the structures of diamonds, graphite, silicon dioxide, etc.
Therefore, the network solids are option D. held by the covalent bonds.
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Which of the following is Not a physical change?
A. Grating cheese
B. Melting cheese
C. Fermenting cheese
D. Mixing two cheeses in a bowl
Answer:
c: fermenting of cheese
Answer:
c
Explanation:
What is the "modern" definition of atomic theory?
Answer: The modern atomic theory states that atoms of one element are the same, while atoms of different elements are different. Each element has its own characteristic atomic number. Atoms of the same element can have different numbers of neutrons, however.
Explanation: N/A
I need this now for a test
explain why the dust clouds that moved to the east coast of the united states during the 1934 storm were composed mostly of silt and clay particles
instead of sand
Dust clouds that moved to the east coast of the united states were composed mostly of silt and clay particles due to constant ploughing during drought.
What is Drought?This is defined as dry period in the climate due to insufficient rainfall in the area at a given time.
The drought led to the soil being constantly ploughed thereby loosening and changing the soil type which is susceptible to wind erosion.
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