Answer:
People are getting richer and richer as technology advances, this may make it so that some people are getting treated unfairly. Signs of little money may support the reason that you are not getting the help you need; this means that health problems would arise more, resulting in an unfair lifestyle.
What did the periodic table help scientists discover?
Scientists can use the table to analyze reactivity among elements, predict chemical reactions, understand trends in periodic properties among different elements and speculate on the properties of those yet to be discovered.
the nucleus or center area of the atom contains two kinds of subatomic particles. which two?
hello can anyone help?
Potassium, K, forms a compound with fluorine, F
Which statements about this compound are correct?
1) The compound is ionic.
2) The formula of the compound is KF.
3) The compound is soluble in water.
A) 1 2 and 3
B) 1 and 2 only.
C) 1 and 3 only
D) 2 and 3 only
Answer:
A ) 1, 2 and 3
Explanation:
1 ) is correct because,
K donates 1 electron
F gain 1 electron from K.
If donating and gaining of electrons takes place between two electron, then type of compound formed is ionic.
2 ) is correct because,
K + F -----> KF
3 ) is correct because,
KF is soluble in cold water; very soluble in hot water.
An atom is electrically neutral when...
O The number of protons and neutrons are equal.
O The number of protons and electrons are equal.
O The number of neutrons and electrons are equal.
O The neutrons balance the protons and electrons.
Answer:
The number of protons and electrons are equal.
Explanation:
When an atom has an equal number of electrons and protons, it has an equal number of negative electric charges (the electrons) and positive electric charges (the protons). The total electric charge of the atom is therefore zero and the atom is said to be neutral.
NO LINKSSSS PLEASE!!!
The solubility of oxygen gas in water is increased by which of the procedures shown below?
Select one:
a. Decreasing the temperature of the solution.
b. Decreasing the pressure on the solution.
c. Increasing the temperature of the solution.
d. Stirring the solution.
Answer: b
Explanation:
a standard solution is made by diluting a small volume of stock solution. if 2.42 ml of stock solution is mixed with 7.55 ml of water, what is the concentration of the diluted solution? the stock solution concentration is 0.197 m.
Taking into account the definition of dilution, the concentration of the diluted solution is 0.063 M.
DilutionWhen it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.
Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.
In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
Ci: initial concentrationVi: initial volumeCf: final concentrationVf: final volumeConcentration of the diluted solutionIn this case, you know:
Ci= 0.197 MVi= 2.42 mLCf= ?Vf= 7.55 mLReplacing in the definition of dilution:
0.197 M× 2.42 mL= Cf× 7.55 mL
Solving:
(0.197 M× 2.42 mL)÷ 7.55 mL= Cf
0.063 M= Cf
In summary, the concentration of the diluted solution is 0.063 M.
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Which of the following particles are found in the nucleus of an atom? (Select all that apply).electronsprotonsneutronscompounds
Answer:
protons and neutrons
Explanation:
Neutrons and protons are the particles that are found in the nucleus of an atom.
What are protons and neutrons?Protons and neutrons are subatomic particles. They are present in the nucleus of an atom and constitute most of the mass of the atom. There are three kinds of subatomic particles that are present in an atom.
These are -
Electrons: Electrons are negatively charged particles. These are present in the atomic shells of the atom. The number of electrons in the last shell of the atom constitutes the valency of the atom. Protons: Protons are positively charged particles. These are present in the nucleus of the atom.Neutrons: Neutrons are neutral molecules with no charge. These are also present in the nucleus of the atom.Since most of the mass of the atom, in the form of protons and neutrons, is present in the nucleus, the mass number is denoted as the sum of the number of protons and neutrons. Protons and neutrons together are sometimes also called nucleons.
Therefore, neutrons and protons are present in the nucleus of an atom.
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Oxygen can be produced in the laboratory by the reaction
2KClO3———-> 2KCl+3O2
How much potassium chlorate is needed to produce 2.75 L of oxygen, collected over water at 37°C and 94.9 kPa? The vapor pressure of water at 37°C is 6.28 kPa.
Answer:
5.2g potassium chlorate is needed to do so
1. Imagine doing the same virtual experiment using wood as the bottom material, instead of glass or water. Predict how the light would interact with the wood.
The wood can't do the same function as done by the water and glass in the same virtual experiment due to its different chemical composition.
The light will not pass through the wood due to its translucent behaviour that prevents light to pass through it as compared to water and glass which are transparent materials and light can easily pass through it.
So using wood as a bottom material instead of glass and water will not perform the same function as perform by water and glass in the same virtual experiment so we can conclude that wood can't perform the same function in the experiment.
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Assume that wave B has a wavelength of 415 nm. Calculate the frequency of the wave. The value for c is 3.00 x 10 8 m/s. The wavelength of wave A is [__________]Hz.
The wave B has wavelength of 415 nm. The value for c is 3.00 x 10 8 m/s. The frequency is 7.22 x 10¹¹ Hz.
What is frequency?Frequency is defined as the number of waves passing through a fixed point in a given amount of time.
The frequency can also be defined as a repeated event is the number of occurrences per unit of time.
Frequency can be expressed as
f = c / ∧
Where c = 3.00 x 10⁸ m/s
∧ = 415 nm
So, f = 3.00 x 10⁸ m/s x 415 nm
f = 7.22 x 10¹¹ Hz.
Thus, the wave B has wavelength of 415 nm. The value for c is 3.00 x 10 8 m/s. The frequency is 7.22 x 10¹¹ Hz.
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What happens to mass and energy in a closed system?
A. Only energy can enter or exit a closed system.
B. Neither energy nor mass can enter or exit a closed system.
C. Only mass can enter or exit a closed system.
D. Both energy and mass can enter or exit a closed system.
Answer:
the correct answer is D. Both energy and mass can enter or exit a closed system.
Explanation:
Answer: A.
Explanation:
only energy can enter or exit a closed system
How would one convert 6 pounds to ounces (16 oz = 1b)?
Answer:
D.
Explanation:
I just got it right in the test :)
the part of an atom that has an overall positive charge is called
calculate the kinetic energy of a baseball (mass = 5.25 oz) with a velocity of 1.0 x 10^2 mi/h
Answer:
262.5 Joules
Explanation:
You find the kinetic energy of multiplying half of the mass by the velocity. In this word problem it tells you the mass so you divide it by 2. That answer is 2.625, you then multiply that by the velocity, in this instance it's 1.0 x 10^2 mi/h.
The unit in kinetic energy is Joules. This is actually a really important part in chemistry and physics.
The kinetic energy of a baseball (mass = 5.25 oz) with a velocity of 1.0×10² mi/h is 147.88 joules.
How do we calculate kinetic energy?Kinetic energy of any object will be calculated by using the below equation:
K.E. = 1/2(mv)², where
m = mass of object in kg = 5.25 oz = 0.148 kg
v = velocity in m/sec = 1.0×10² mi/h = 160934 m/h = 44.704 m/s
On putting values on the above equation, we get
K.E. =1/2(0.148)(44.704)²
K.E. = 147.88 joules
Hence required kinetic enrgy is 147.88 joules.
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acid + base —> salt + water
What type of reaction is this?
[tex]\sf{Acid}+\bf{Base}\longrightarrow \tt{Salt}+\bold{Water }[/tex]
These type of reaction is called as Neutralization Reaction.
write the stracture of 2,2-dimetyl butane
Answer:
Explanation:
Let's break it down:
Butane- A 4 carbon alkaneMethyl - A CH₃ group2,2 - Both the Methyl groups are attached at carbon 2We can now draw the structure of 2,2-dimethyl butane using the following steps:
Draw the backbone (butane)Draw the substituents (2 methyl groups at carbon 2)Which of the following is a physical change?
evaporation
explosion
rotting of food
corrosion
Answer:
i believe it is c
evaporation
Explanation:
Hope it's the correct one if not very sorry.
Number 8 question need help
Answer:
where is the question
Explanation:
pls. send it
Explain how the fire spreading from tree to tree provides a model for conduction.
The great fire of 1910 burned through parts of north Idaho, western Montana, eastern Washington,and southeastern British Columbia. Many small fires and several large fires that were started by an electric storm coalesced into one”big blowup” of unprecedented size that lasted two days. Hurricane-force winds spread the firestorm; trees became blowtorches, sucking fire from the ground and hurling it in several directions, spreading the fire on contact. Witnesses described fireballs being flung like cannons. Trees exploded like fireworks. The fire killed 87 people, destroyed towns in its path, and burned more than three million acres of forest
the fire spreading is what represents the form of heat transferring from one atom to another within an object and direct contact
6. Haydee prepared a solution with 3mL of potassium chloride (KCl) in 200 mL of water is prepared. Calculate the percent by volume concentration of the solution.
A. 1.46% B.1.48 %
C. 1.49 % D. 1.50%
Considering the definition of percent by volume concentration, the correct answer is option D: the percent by volume concentration of the solution is 1.50%
Percent by volume concentration is a measure of concentration that indicates the volume of solute per 100 volume units of the solution. This value is calculated by dividing the volume of the solute by the total volume of the solution, and multiplying by 100 to express it as a percentage:
[tex]percent by volume concentration=\frac{volume of solute}{total volume of the solution}x100[/tex]
In this case, you know:
volume of solute= 3 mLtotal volume of the solution= 200 mLReplacing in the definition of percent by volume concentration:
[tex]percent by volume concentration=\frac{3 mL}{200 mL}x100[/tex]
Solving:
percent by volume concentration=0.015×100
percent by volume concentration=1.50
Finally, the correct answer is option D: the percent by volume concentration of the solution is 1.50%
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https://brainly.com/question/1713808Physical change definition.
NO links, please.
Answer:
a usually reversible change in the physical properties of a substance, as size or shape:
Freezing a liquid is a physical change.
Explanation:
Answer:
Hey!
Explanation:
The definition of physical change can be expressed as.. let's say.. the physical difference in an organism. Physical change affects the form of a chemical substance, but not its chemical composition. Hope this helps! :)
Atomic Number
Atomic Mass Number
Protons
Neutrons
Electrons
Charge
Element 1
6
12
A
6
6
B
Element 2
6
13
6
C
D
1+
Look at the above table.
What charge (B) should Element 1 have
Question 2 options:
0
6
12
1+
Answer:
B for element 1 0 charge
Explanation:
Atomic Number
Atomic Mass Number
Protons
Neutrons
Electrons
Charge
Element 1
6
12
A
6
6
B
Element 2
6
13
6
C
D
1+
Look at the above table.
What charge (B) should Element 1 have
Question 2 options:
0
6
12
1+
from the data we can construct the following table
element 1 element 2
Atomic # 6 6
Atomic mass 12 13
protons 6 6
neutrons 6 7
electrons 6 5
charge 0 +1
the atomic # of both is 6, so they are both carbon with 6 protons
element 1 has a total of protons plus neutrons of 12, element 2 of 13
so element 1 has 6 neutrons,element 2 has 7
element 2 has a +1 charge with 6 protons, so it has only 5 negative electrons
element 1 with 6 protons has 6 electrons, so it has a 0 charge
What are the three principles of Kinetic Molecular Theory
Answer:
The simplest kinetic model is based on the assumptions that: (1) the gas is composed of a large number of identical molecules moving in random directions, separated by distances that are large compared with their size; (2) the molecules undergo perfectly elastic collisions (no energy loss) with each other and with the
Explanation:
An atom will be neutral ONLY if
Answer:
They have the same number of charged protons and electrons, therefore balancing positive and negative charges. I hope this helps you.
Explanation:
A strong acid is one that
a Doesn’t easily dissociate into ions when I’m solution
B is very dilute in the solution
C easily dissociates into ions when I’m solution
d is very concentrated in the solution
Answer:
C. easily dissociates into ions when I’m solution
Explanation:
Strong acids are compounds that completely decompose when dissolved in water and produce the total number of ions.
Which of the following is a true statement?
Growth cycles only happen to reptiles.
Growth cycles happen to all animals.
Growth cycles only happen to birds.
Growth cycles only happen to mammals.
Answer:
its either all animals or only mammals. the thing with all animals is that they do have life cycles but not the same as like say humans or elephants, some are complicated.
Problem: Janna, a student of a chemistry class, told her friend that she learnt in class that bottled water is not pure. Kim, her best friend, refused to believe Janna, referring to phrases on the label of the bottle.Help me
Answer:
The bottle is labeled pure so it probably is pure.
Explanation:
I will make you brainless answer this 1 question pleaaeeee!
C. Point 3
Explanation:
Because it is increasing dramatically
Which equation is balanced?
A) A
B) B
C) C
D) D
Answer:
All of them are equal cause they both have the same sign
Explanation:
draw the product of the sn2 reaction and indicate stereochemistry. write the inorganic product in the answer palette.
SN2 reaction proceeds with inversion of configuration at the reacting carbon atom. The product has a different configuration at this carbon atom from the product.
SN2 reaction is a short form for substitution nucleophilic bimolecular reaction. It is a synchronous reaction in which the leaving group departs at the same time as the nucleophile attacks in a single transition state.
Recall that SN2 reaction proceeds with inversion of configuration hence the product has a different configuration at the reacting carbon atom from the product. The inorganic product in this reaction is HI. The organic product is shown in the image attached to this answer.
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