Answer:
B
Explanation:
Select the correct answer from each drop-down menu.
A balloon holds a certain volume of air. In what three ways can the volume of the balloon be increased?
- the number of air molecules in the balloon(increase or decrease)
- the temperature of the balloon(increase or decrease)
- the pressure on the balloon(increase or decrease)
Answer:
increase,increase,decrease
Explanation:
HURRRY ASAP!!
An important consideration of the medical use of radioisotopes is how long they're active. Technetium-99 is a short-lived isotope of technetium with a half-life of 6 hours. If a patient is treated with technetium-99 for a PET scan, when will the patient have less than 1 percent of the original technetium-99 present?
A)
3 days
B)
40 hours
C)
6 hours
D)
0.00116 hours
PLEASE HELP SOMEONE !!!!!!!!!!!!!!!!!!!
Answer:
sodium
Explanation:
sodium has 11 electrons.
This woman comes to the clinic with high blood pressure,
hyperglycemia(high blood sugar), weakening of the bones and severe
depression of the immune system. Can you diagnose her condition?
Which method involves separating a solution by liquids moving across a selectively permeable membrane?
Distillation
Chromatography
Fractionation
Osmosis
Answer:
OSMOSIS
Explanation:
Osmosis (/ɒzˈmoʊ.sɪs/) is the spontaneous net movement or diffusion of solvent molecules through a selectively permeable membrane from a region of high water potential (region of lower solute concentration) to a region of low water potential (region of higher solute concentration),
Calculate the shortest wavelength of the electromagnetic radiation emitted by the hydrogen atom in undergoing a transition from the n = 6 level.
Answer:
[tex]\lambda = 9.376*10^{-8} m[/tex]
Explanation:
From the question we are told that:
[tex]n=6level[/tex]
Generally the equation for Energy is mathematically given by
[tex]E=\frac{hc}{\lambda}[/tex]
Since
Energy difference will be maximum when electron return to ground state
And Shortest wavelength is emitted when there is largest energy difference
Therefore
[tex]1/\lambda = R* (\frac{1}{nf^2} - \frac{1}{ni^2})[/tex]
Where
[tex]R=Rydberg\ constant[/tex]
[tex]R = 1.097*10^7[/tex]
Therefore
[tex]1/\lambda = 1.097*10^7* ((\frac{1}{1^2} - \frac{1}{6^2})[/tex]
[tex]\lambda = 9.376*10^{-8} m[/tex]
An oil may be converted into a substance that is solid at room temperature by Group of answer choices adding hydrogens, decreasing the number of double bonds in the molecules. cooling it, so that double bonds form and the fats solidify. removing water, causing a dehydration synthesis reaction to occur. removing hydrogens, increasing the number of double bonds in the molecules.
Answer:
Adding hydrogens, decreasing the number of double bonds in the molecules.
Explanation:
Hydrogen is a catalyst, which means that it accelerates or speeds up the velocity of a chemical reaction, by adding hydrogens to oil it will decrease the number of double bonds in the molecules which will make it solidify over time.
Oil + hydrogen creates substances that are solid at room temperature.
which ancient African Kingdom is located in western Africa?
Answer:
Ghana Empire is was a kingdom in western Africa.
The Oyo Empire was the ancient African Kingdom is located in western Africa.
What is Oyo Empire?The Oyo Empire prospered on regional trade and became a key facilitator in moving slaves from Africa's interior to the coast and waiting European sailing ships, with its capital at Old Oyo near the River.
The human trade was so extensive that this region of Africa became known simply as the "Slave Coast."
Finally, despite all efforts, the Oyo Empire became a protectorate of the United Kingdom in 1888; its states ceased to exist as a superpower, and it never regained its prominence in the region.
During the colonial period, however, the Yoruba were one of Africa's most urbanized groups.
Thus, the ancient African kingdom of the Oyo Empire was located in western Africa.
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A magnesium ion, Mg2+, is formed from a magnesium atom, Mg.
Which row about the numbers of protons and neutrons in the magnesium ion and in the magnesium atom is correct?
Why the answer for this question is B.
Pls help to explain it. Thank you.
Answer:
The correct row is B.
Explanation:
The formation of the magnesium ion, Mg²⁺, comes from the removal of 2 electrons from the valence shell of the magnesium atom. Since the remotion is of electrons, the nucleus of the atom remains the same, so the number of protons and the number of neutrons does not change.
If the number of proton change, then the atom also change, since the identity of an atom is related to the atomic number which is the same to the proton number.
Now, if the number of neutrons changes, then we would be in the presence of an isotope of the magnesium atom.
Therefore, the correct row is B.
I hope it helps you!
circle the correct words to complete the sentences
1. Precipitation falls in these two forms: solid/liquid/gas
2. Evaporation changes gas/liquid water to ice (solid)/water vaoor (gas)
Answer:
1. solid and liquid
2.Evaporation changes liquid water to water vapour.
Answer: i don't know i just want points sorry can you blame me you would do the same too i know you
Explanation:
yay i got 5 points
Which of the following most likely happens when the number of particles of a gas decreases?
The pressure of the gas increases.
The pressure of the gas remains same.
The number of collisions of gas particles decreases.
The number of collisions of gas particles remains same.
Answer: C. The number of collisions of gas particles decreases
Explanation: As temperature decreases so does everything else same with increase.
When the number of particles of a gas decreases the pressure of the gas increases.
Factors affecting has pressureIn a container containing has molecules, they move about freely in the container but the pressure it exerts on its container depends increase of decrease of the has molecules by volume.
If the volume of a container is decreased, the gas molecules have less space in which to move around. As a result, they will strike the walls of the container more often and the pressure increases.
Therefore, when the number of particles of a gas decreases the pressure of the gas increases.
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what are the characteristics or properties that you can use to classify elements
Answer:
The number of outermost energy level electrons ( valency electrons )
The atomic number
If 0.654 g of oxygen dissolves in 1.5 L of water at 1.65 atm, at what pressure (in atm) would you be able to dissolve 1.35 g in the same amount of water?
Explanation:
dylalove464
06/11/2020
Hello,
In this case, we first compute the moles of oxygen in 0.654 g and 1.35 g by using its molar mass (32 g/mol):
Then, by using the ideal gas equation at the both states, given the same both temperature and volume:
We compute the volume at the second moles:
Best regards.
Answer:
3.41
Explanation:
:)
How does anatomy provide evidence for evolution?
I'll give brainlist!! Simple answer please.
I'm having trouble with this one
Answer:
1) 7 moles
2) 82.4 grams approximately
True or False? Once a sugar molecule is dissolved, it remains as long as the conditions (temperature,
amount of water, stirring, etc.) remain constant.
Answer:
The above statement is False
PLEASE ANSWER URGENTLY!! What is the daughter particle if Uranium -234 undergoes beta decay? Write your answer in isotopic notation.
Answer:
²³⁴₉₃Np.
Explanation:
We can obtain the daughter particle as follow.
Let ⁿₓM represent the daughter particle.
Thus, the equation for the reaction is given below :
²³⁴₉₂U —> ⁿₓM + ⁰₋₁e
Next, we shall determine n, x and M. This can be obtained as follow:
234 = n + 0
234 = n
n = 234
92 = x + (–1)
92 = x – 1
Volume like terms
92 + 1 = x
93 = x
x = 93
ⁿₓM => ²³⁴₉₃M => ²³⁴₉₃Np
Thus, the equation for the reaction becomes:
²³⁴₉₂U —> ²³⁴₉₃Np + ⁰₋₁e
The daughter particle => ²³⁴₉₃Np
How many Group 17 elements are in Period 3 of the Periodic Table? A) 1 B) 2 C) 3 D) 4
How many grams of NaOH are needed to make 250mL of a 0.1M NaOH solution?
Answer:
To make 250 ml of 0.1 M NaOH, you dissolve 1 gram NaOH in enough water to make a final volume of 250 mls.
Explanation:
Your welcome! :)
The following statements characterize a chemical reaction, EXCEPT a.The atoms of the substance rearrange, but the total number of atoms remain the same after the reaction. b.a change in odor c.a change in the total mass of the product d.Energy is involved in the reaction that is either absorbed or released.
Answer:
C. a change in the total mass of the product
Explanation:
A chemical reaction is a reaction that alters the chemical composition of the substances involved. Based on the options in this question, a chemical reaction possess the following features:
- The atoms of the substance called reactants are rearranged into products but the total number of atoms remain the same after the reaction.
- A change in odor occurs as one of the indicators that a chemical reaction has taken place.
- Energy is either absorbed (endothermic) or released (exothermic) in the chemical reaction.
However, one untrue option is that "there is a change in the total mass of the product". The total mass of a chemical reaction does not change i.e. remains the same, before or after the reaction in accordance to the law of conservation of mass.
Which of the following lists the relative strengths of the fundamental forces from strongest to weakest?
A. Strong nuclear force weak nuclear force, gravitational force, electrostatic force
B. Gravitational force, strong nuclear force electrostatic force, weak nuclear force
C. Electrostatic force, gravitational force, weak nuclear force, strong nuclear force
D. Strong nuclear force, electrostatic force, weak nuclear force, gravitational force
Answer:
D. Strong nuclear force, electrostatic force, weak nuclear force, gravitational force
There are four fundamental or universal forces in nature. Without these forces, all matter in the world will fall apart. The relative strength of fundamental forces is Strong nuclear force, electrostatic force, weak nuclear force, gravitational force. Thus the correct option is D.
What are fundamental forces?The fundamental forces are also called the fundamental interactions. All the known forces of the nature can be collectively called the fundamental forces. The four important fundamental forces are gravitational, electrostatic, strong and weak nuclear forces.
The gravitational force is the weakest fundamental force. It is an attractive force which arises from the gravitational interaction. The attractive as well as the repulsive force caused by the electrically charged particles is defined as the electrostatic force.
The nuclear force is the strongest attractive force. The strong nuclear forces hold the nuclei of atoms together. The weak nuclear forces are responsible for the radioactive decay.
Thus the correct option is D.
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Which of the following is the best definition of nuclear fission?
O A. Nuclear fission is the joining of two or more nuclei into one
nucleus.
B. Nuclear fission is the formation of new isotopes through a gain of
electrons.
C. Nuclear fission is the splitting of a nucleus into two or more
nuclei.
O D. Nuclear fission is an exothermic reaction between two stable
nuclei.
Answer:
C
Explanation:
Nuclear fission is a process where the nucleus of an atom is split into two or more smaller nuclei, known as fission products.
Nuclear fission is the splitting of a nucleus into two or more nuclei defines best of nuclear fission among the following , therefore option (c) is correct.
What do you mean by the nuclear fission ?Nuclear fission is a process in which an unstable nucleus splits into two nuclides and emits neutrons.
The fission process often produces free neutrons and photons and releases a large amount of energy. Therefore , nuclear fission is either a nuclear reaction or a radioactive decay process.
The fission process often produces gamma radiations , and releases a very large amount of energy .
Nuclear fission is the splitting of a nucleus into two or more nuclei defines best of nuclear fission among the following , hence option (c) is correct.
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what is quantum physics
What do you notice about the distance between the terrestrial planets compared with the spacing between the gas giants
Answer:
The spacing between the terrestrial planets is less than that between the gas planets.
Explanation:
Since the terrestrial planets which are Mercury, Venus, Earth and Mars have a distance of 0.4 AU, 0.7 A.U, 1.0 AU and 1.5 A.U respectively from while the gas planets which are Jupiter, Saturn, Uranus and Neptune have a distance of 5.2 AU, 9.6 AU, 19.6 AU and 30 AU respectively from the sun, we can see that the spacing between the terrestrial planets is much smaller than the spacing between the gas planets.
For example, the spacing between Mercury and Venus is 0.7 AU - 0.4 AU = 0.3 AU while that between Earth and Venus is 1.0 AU - 0.7 AU = 0.3 AU.
Also, the spacing between Earth and Mars is 1.5 AU - 1.0 AU = 0.5 AU.
Also too, the spacing between the gas planets is shown below the spacing between Jupiter and Saturn is 9.6 AU - 5.2 AU = 4.4 AU while that between Uranus and Saturn is 19.6 AU - 9.6 AU = 10.0 AU.
Also, the spacing between Neptune and Uranus is 30 AU - 19.6 AU = 10.4 AU.
Thus, we can see that the spacing between the terrestrial planets is less than that between the gas planets.
Note that AU means astronomical unit and 1 AU is the distance between the Earth and the Sun. 1 AU = 1.50 × 10⁸ km
Why does hydrogen naturally form diatomic molecules (H2), whereas helium exists as a single atom (He)?
Answer:
Hydrogen is a very reactive element. It doesn't exist as a single atom in nature. Neither do any of the other binary nonmetals -- nitrogen, oxygen, fluorine, chlorine, bromine, and iodine. They're too prone to react with something. They react with each other and form binary molecules because the binary molecules are more stable than single atoms (by a lot!). Compounds with other atoms are even more stable, so hydrogen reacts with oxygen to form water, and chlorine reacts with sodium to form table salt.
Explanation:
Cuantos moles de CO2 se requieren para reaccionar con 2 moles de Ba (OH)2
Answer:
hola soy jess, tu respuesta esta aqui
¿cuantos moles de CO2 se requiere para reaccionar 2 moles de Ba(OH)2
2 mol Ba(OH)₂ × \frac{1molCO_{2} }{1molBa (OH)_{2}}
1molBa(OH)
2
1molCO
2
= 2 moles CO₂
Explanation:
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Geometric isomers have profound effects on the physical properties of compounds. Naturally occurring fatty acids generally adopt a cis geometry. What's one physical property affected by this geometry?
A)
Color
B)
Taste
C)
Smell
D)
Melting point
CO(g) + 3 H2(g) → CH4(k) + H2O(g) + heat
The sign of AH is
The sign of AS is
The sign of AG is negative a low or high temperature?
Explanation:
AH is negative because the reaction gives out heat (exothermic).
AS is negative because the total entropy of the reactants is greater than that of the products (there are 4 moles of gas on reactant side compared to only 1 mole on the product side). Thus, the reactants are said to be "messier" than the products.
AG is negative at lower temperatures because at low temperatures, -TAS is more negative, resulting in the negative sign of AG.
Hope this helps.
Please somone help me with a chemistry question brainliest to whoever answers correctly and 20 points
Answer:
289.15k is the answer buddy
Name any three organic fertilizer using by farmers ?
Answer:
Typical organic fertilizers include mineral sources, all animal waste including meat processing, manure, slurry, and guano, plant based fertilizers, such as compost, and biosolids.