Answer:
A. star formation begins in a nebula.
Explanation:
what is the isotope formed during radioactive decay
Answer: Except for gamma decay or internal conversion from a nuclear excited state, the decay is a nuclear transmutation resulting in a daughter containing a different number of protons or neutrons (or both). When the number of protons changes, an atom of a different chemical element is created.
Explanation:
1
Which of the following is a true statement
about atomic nuclel?
A They are made up of protons, neutrons, and electrons
B They have
net positive charge
C Every atomic nucleus has the same number of particles
D
The atomic nucleus has no relation to an atom's mass
Answer:
I believe the answer is B
Explanation:
A nucleus of an atom has protons and neutrons. We know that a proton has a charge of +1 , while a neutron has no charge, or 0 . Therefore, the nucleus of an atom will always have a positive charge.
Where is the oldest rock layer in the dome?
Answer:
the oldest rocks are in the center of the dome structure.
Explanation:
Answer:
Center
Explanation:
“gasoline boils at a relatively low temperature (about 150 C). the kerosene is removed at around 200C, followed by diesel oil at 300C and fuel oil at around 370C”.
What topic is the teacher most likely talking about?
A. distillation of a mixture
B. filtration of pure substance
C. evaporated of a mixture
D. sorting of a pure substance
Answer:
A. distillation of a mixture
Explanation:
The topic the teacher is most likely talking about is the distillation of a mixture.
During fractional distillation, a mixture is separated into it constituents based on differences in their boiling point.
A liquid made up of denser hydrocarbon such as crude oil is fed into the distillation chamber. It is then heated. At different boiling point of its constituents, the fractions begins to separate out. They rise in the column. The condensate is then collected.This process is the distillation of mixture.
Answer:
A is the correct answer (distillation of a mixture)
Explanation:
A 100.0 mL sample of 0.18 M HClO4 (Strong acid) is titrated with 0.27 M LiOH. Determine the pH of the solution after the addition of 75.0 mL of LiOH
Answer:
pH = 12.11
Explanation:
Hello!
In this case, since the chemical reaction between perchloric acid and lithium hydroxide is:
[tex]HClO_4+LiOH\rightarrow LiClO_4+H_2O[/tex]
Whereas the mole ratio between the acid and base is 1:1, it means they react in the same proportion. In such a way, given the volume and concentration of acid, we compute the moles:
[tex]n_{acid}=0.1000L*0.18mol/L=0.018mol[/tex]
Now, the moles of base that reacted:
[tex]n_{base}=0.075L*0.27mol/L=0.02025mol[/tex]
Thus, since there is an excess of lithium hydroxide of:
[tex]n_{LiOH}^{remaining}=0.02025-0.018=0.00225mol[/tex]
We compute the new concentration considering the total final volume of 175.0 mL:
[tex][LiOH]=\frac{0.00225mol}{0.1750L}=0.013M[/tex]
Now, since there is a strong base remaining in solution, we compute its pOH first:
[tex]pOH=-log([OH^-])=-log(0.013M)=1.89[/tex]
Because LiOH is fully ionized to Li⁺ and OH⁻ ions. Therefore the pH is:
[tex]pH+pOH=14\\\\pH=14-pOH=14-1.89\\\\pH=12.11[/tex]
Best regards!
3. A solution is neutral if it has more hydronium ions than hydroxide ions.
a. True
b. False
Answer:
false
Explanation:
Please Please! help help! so stress
If you have 0.341 m3 of water at 25.0 ∘C in an insulated container and add 0.127 m3 of water at 95.0 ∘C, what is the final temperature f of the mixture? Use 1000 kg/m3 as the density of water at any temperature.
Answer:
[tex]T_F=44.0\°C[/tex]
Explanation:
Hello!
In this case, since this calorimetry problem is about the mixing of two volumes of water, we can infer that the heat lost by the hot water is gained by the cold water so we can write:
[tex]Q_{W,hot}=-Q_{W,cold}[/tex]
Which in terms of mass, specific heat and temperature change is:
[tex]m_{W,hot}C_{W,hot}(T_F-T_{W,hot})=-m_{W,cold}C_{W,cold}(T_F-T_{W,cold})[/tex]
Clearly, the specific heat is the same for both waters and the masses, considering the given densities are:
[tex]m_{W,cold}=0.341m^3*\frac{1000kg}{1m^3} =341kg\\\\m_{W,hot}=0.127m^3*\frac{1000kg}{1m^3} =127kg\\[/tex]
Thus, we can solve for the the final temperature as shown below:
[tex]T_F=\frac{m_{W,hot}T_{W,hot}+m_{W,cold}T_{W,cold}}{m_{W,hot}+m_{W,cold}}[/tex]
And by plugging in the values we obtain:
[tex]T_F=\frac{341kg*25.0\°C+127kg*95.0\°C}{341kg+127kg}\\\\T_F=44.0\°C[/tex]
Best regards!
The final temperature of the mixture of hot and cold water at the given masses is 44 ⁰C.
The given parameters;
volume of the cold water, V = 0.341 m³ initial temperature of the wave, = 25⁰Cvolume of water added hot water, = 0.127 m³final temperature of water, = 95⁰ CThe mass of the cold water and the hot water are calculated as follows;
[tex]mass = density \times volume\\\\m_{cold} = 1000 \times 0.341 = 341 \ kg\\\\m_{hot} = 1000 \times 0.127 = 127 \ kg[/tex]
Apply the principle of conservation of energy to determine the final temperature of the mixture;
heat lost by the hot water = heat absorbed by the cold water
[tex]341 \times 4200 \times (t - 25) = 127 \times 4200 \times (95 - t)[/tex]
where;
t is the final temperature of the mixture[tex]341(t- 25) = 127(95-t)\\\\341t - 8525 =12065 - 127t\\\\468t = 20590\\\\t = \frac{20590}{468} \\\\t = 44 \ ^0C[/tex]
Thus, the final temperature of the mixture of hot and cold water at the given masses is 44 ⁰C.
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How did Altair begin
Answer:
Altaïr is an ancestor (on the maternal side) of Desmond Miles, a modern-day assassin. He was trained in the Masyaf Castle in Syria by Al Mualim, his guardian since childhood.
Explanation:
How do clouds relate to climate change
Answer:
Clouds can block light and heat from the Sun, making Earth's temperature cooler. You've probably noticed this kind of cooldown on a cloudy day. However, some heat from the Sun does get down to Earth. Clouds can trap that heat from the Sun.
Hope that helps :)
A sample of gas contains 0.1200 mol of NH3(g) and 0.1500 mol of O2(g) and occupies a volume of 13.0 L. The following reaction takes place: 4NH3(g) + 5O2(g)4NO(g) + 6H2O(g) Calculate the volume of the sample after the reaction takes place, assuming that the temperature and the pressure remain constant.
Answer:
14.44 Liters
Explanation:
4NH3(g) + 5O2(g) -----> 4NO(g) + 6H2O(g)
From the equation of the reaction, the mole ratio of NH3 to NO2 = 1:1
Therefore 0.12 moles of NH# produces 0.12 moles of NO
Also from the equation of reaction, mole ratio of NH3 to H20 is 4:6
Therefore, 0.12 moles of NH3 will produce 0.12 * 6/ 4 moles of H2O =0 0.18 moles of H2O
Total moles of gases produced = 0.30 mole
From Avogadro's law:
v1/n1 = v2/n2
v1 = 13.0 L
n1 = 0.12 + 0.15= 0.27 moles
v2 = ? =
n2 = 0.30
V2 = v1n2/n1
v2 = 13.0 * 0.30/0.27
V2 = 14.44 Liters
How many grams of argon (Ar) are in 32.1 moles?
Answer:
The answer is 39.948.
Explanation:
you are converting between grams Argon and mole. You can view more details on each measurement unit: molecular weight of Argon or mol The molecular formula for Argon is Ar. The SI base unit for the amount of substance is the mole.
Answer:The answer is 0.025032542304996.
Explanation:
We assume you are converting between moles Argon and gram. You can view more details on each measurement unit: molecular weight of Argon or grams The molecular formula for Argon is Ar. The SI base unit for amount of substance is the mole.
Someone please help! Hurry
9.78 cm equals how many
mm
Answer:
97.8
Explanation:
12. Most metals share four common physical characteristics. Which of the options is not one of the four?
O D. Conductivity
O A Luster
O B. Conductivity
O C. Malleability
O E Reactivity
Answer:
E Reactivity
Explanation:
Reactivity is not one of the properties shared by metals with one another.
The reactivity of a substance is its ability to combine with other substances. Reactivity is not used to measure the physical property of a metal.
Physical properties are those that we can sense with our senses. For metals, conductivity, luster, malleability are all properties of metals. They can be examined using our active senses.The physical properties observed in metals derives from the metallic bonds within their atomic structure.
Conductivity, luster, malleability, ductility, magnetism etc. are some of the other physical properties of metals.
The beginning of this chemical equation represents the
starting materials for a chemical reaction,
H2O + S03 - ?
Which compound is likely produced by the chemical reaction?
A. HF
B. H2CO3
C. H2SO4
D. CO2
SUBMIT
Answer:
C. H₂SO₄
Explanation:
Given expression:
H₂O + SO₃ → H₂SO₄
In the chemical reaction, the product and the reactant have the same species.
Chemical reactions obeys the law of conservation of matter.
This way, atoms combine with one another to give a desired product. The products will contain a mix of the reactants.
Fluorine is not part of the reactantsCarbon is not part of the reactantsCarbon is not part of the reactants.Answer:
cccccccccc
Explanation:
If you put hydrogen (H1+) and Hydroxide (OH1) together what it’s it called?
Answer:
The hydroxyl ions (OH-) released will combine with any hydrogen ions (H+) in the solution to form water molecules (OH- + H+ = H2O).
Explanation:
What elements would likely form an ionic bond?
a. C & O
b. Mg & Cl
c. Mg & Ca
d. Cl & Ar
When electrons are ______________ from one atom to another, we say the bond is ionic.
a. transferred
b. shared
How many electrons does 47Ag+1 have?
107
47
48
46
Answer:
b. Mg & Cl
a. transferred
46
Explanation:
Ionic bonds form between metals and non-metals when electrons are transferred from one specie to another.
The electrostatic attraction from the resulting ions forms the ionic bonds. A metal is electropositive and will readily donate electronsA non-metal is electronegative and will accept electrons. This creates two oppositely charge ions that attracts by means of ionic bonding.Since Mg and Cl are the only metal - non-metal pair, and ionic bond will form between them.
2.
In the specie;
₄₇Ag¹⁺
47 is the atomic number of the element Ag.
The atomic number is the number of protons in an atom. For a specie in neutral state, the number of protons and electrons are the same.
When an atom loses electron, it becomes positively charged. Here Ag has lost one electron and then, the number of electrons becomes 46. The number of protons is still 47Is weathering a constructive or deconstructive process?
Which of the following gives a buffer solution when equal volumes of the two solutions are mixed?a. 0.20 MHF and 0.10 MNaOH.b. 0.10 MHF and 0.10 MNaOH.c. 0.10 MHF and 0.10 MNaF.d. 0.10 MHCl and 0.20 MNaF.
Answer:
a. 0.20 M HF and 0.10 M NaOH.
c. 0.10 M HF and 0.10 M NaF
d. 0.10 M HCl and 0.20 M NaF.
Explanation:
A buffer solution consists of a weak acid and its conjugate base, or of a weak base and its conjugate acid.
In this case, HF is the weak acid and F⁻ is its conjugate base.
Let's go case-by-case:
a. 0.20 M HF and 0.10 M NaOH.
Some -but not all- HF will react and produce F⁻, leaving a buffer solution.b. 0.10 M HF and 0.10 M NaOH.
All HF will react, not a buffer solution.c. 0.10 M HF and 0.10 M NaF.
There's no reaction, and both HF and F⁻ are directly added, it is a buffer solution.d. 0.10 M HCl and 0.20 M NaF.
Some F⁻ will react and produce HF, leaving a buffer solution.The correct answers are A), C) and D).
What type of cells are gametes?
Answer:
Reproductive cells(also known as sex cells) are gametes.
Explanation:
Have a great day :)
Answer:
Gametes are an organism's reproductive cells
Explanation:
in order to produce an electric current in a coil of wire , a magnet field through the coil must be
Answer:
moving
Explanation:
In order to produce an electric current in a coil of wire, a magnet field through the coil must be moving.
What is electromagnetic induction?Electromagnetic induction is a process in which electric field is produced due to the change in the value of magnetic field.
So, for the production of an electric current in a coil of wire, a magnet field should be moving through the coil of wire. Process of this electromegnetism get clear through the below attached image.
Hence magnetic field should be moving.
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Thermal expansion happens when
Answer:
the size of an object changes with a change in temperature.
Explanation:
When completing an electron configuration, which of the following rules/principals show that you cannot label two electrons as having the same quantum numbers?
a
Law of Configuration
b
Aufbau Principle
c
Pauli Exclusion Principle
d
Hund's Rule
Answer:
C. Pauli Exclusion Principle
Explanation:
Pauli's exclusion basically suggests that you cannot label two electrons as having the same quantum numbers.
The principle is stated as "no two electrons in an atom can have the same set of four quantum numbers".
It indicates that no two electrons can spin in the same way. This limits the number of electrons that can reside in an orbital to two and with opposite spin.Which of the following is not true
regarding ozone?
A. It contains 3 oxygen atoms
B. It is just like regular oxygen
C. It protects us from UV light
D. It is a layer within another layer in our
atmosphere
Answer:
B
Explanation:
Questlon 3 of 5 Which kind of energy does an object have because of its height above Earth's surface? O A. Electrical O B. Chemical O C. Elastic D. Gravitational
Answer:Electrical
Explanation:because its above the earth's surface
Answer:
Chemical O
Explanation:
Incorrect
Question 8
0/5 pts
(03.03 MC)
The diagram below represents a convection cell. The arrows
indicate the direction of air flow:
Need HELP HURRY
Identify the reactants in the reaction HCl + NaOH → NaCl + H20.
A. HCl and NaOH
B. NaCl and H20
C. Na and CI
D. H and cl
The reactants in the reaction HCl + NaOH → NaCl + H₂0 are HCI and NaOH Hence, Option (A) is correct
What is Reactant ?
The substance(s) to the left of the arrow in a chemical equation are called reactants.
A reactant is a substance that is present at the start of a chemical reaction.
In the given case, HCI and NaOH are the reactants, they both react to form the products, which are NaCl and H₂0.
Therefore,The reactants in the reaction HCl + NaOH → NaCl + H₂0 are HCI and NaOH Hence, Option (A) is correct
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A
map shows the physical properties or characteristics of a region.
highway
topographical
population
computer
compound
Answer:
Topographical is the correct ans
Which of the following describes a study that is “longitudinal”? A study that follows people for an extended period of time to see if they develop a disease or condition. A study that looks at people in one location, to reduce any bias introduced by varying locations. A study that follows people taking a drug or placebo for 6 weeks to see if they develop a disease or condition. A study that follows people taking medication in different locations, to see if their location impacts the medication’s effectiveness.
Answer:
I'd say it's the first option, A study that follows people for an extended period of time to see if they develop a disease or condition.
Explanation:
