What are three ways to identify a substance?
Answer:
based on texture/ feel, oder/smell, melting/boiling point
Explanation:
Answer:
Smell it, drink it, throw it at someone.
Explanation:
If none of that hurts or kills anyone, you can mark everything that would off the list.
How much energy is needed to turn 23 g of water completely into steam if it starts at a temperature of 8.0oC?
Answer:
69% energy
Explanation:
Temperature and kinetic energy have a relationship.
Answer:
[tex]\boxed {\boxed {\sf Temperature=Average \ kinetic \ energy}}[/tex]
Explanation:
Temperature is also known as the average kinetic energy in a substance.
If there is an absence of heat in a substance, the particles move slower and the kinetic energy decreases. The temperature will be lower, because there is less kinetic energy.
If heat is present or applied, the particles move more, so kinetic energy increases. The temperature will be higher, since there is more kinetic energy.
So, the relationship is: temperature is the measure of average kinetic energy.
Answer:
DIRECT
Explanation:
A. Briefly explain how a loss of water by evaporation would affect the initial calculation of the solubility of your salt.
B. Would this initial evaporation affect the calculated solubility of your salt at each subsequent experimental saturation temperature, or just the initial temperature? Explain.
Answer:
Following are the solution to this question:
Explanation:
Please find the complete question in the attached file.
In point a:
When some water evaporates from its mixture, then when a thick layer is initiated, it reduces salt solubility, but sodium remains unclear throughout the solution (ppt solte).
In point b:
Ksp is measured by calculating the mass of its solvent reduction process, decreasing salt solubility and hence decreasing Ksp.
In point c:
From of the graph [tex]\Delta \ H \ \ or \ \ \Delta \ S[/tex] are calculated by [tex]\frac{1}{T}[/tex] v/s lnKsp
(decrease) LnKsp may shift,
[tex]\Delta \ H = -slope \times R \\\\\Delta \ S = intercept \times R[/tex]
So, both are decreasing
a solution is prepared by mixing 360.0 mL of 0.25 M NaOH, 140.0 mL of 0.50 M NaOH, and 300.0 mL of distilled water. Assuming that the volumes are additive, the molarity of NaOH in the resulting solution is
A(n)
______ Is a group of organs that work together to perform a com
Answer:
an organ system Is a group of organs that work together to perform a com
Explanation:
that is the answer organ system
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HOW MANY MOLES ARE IN 2.6 X 1024 ATOMS OF SILICON?
Answer:
Let x moles of silicon contains 2.8x10^24 atoms. 6.02x10^23 atoms are present in 1 mole of Si. Therefore 2.80x10^24 atoms are present in = 2.8x10^24/6.02x10^23 = 4.65 moles of Si.
Explanation:
A piece of rock has a mass of 2.00g. It contains calcium carbonate, but no other
substances. It neutralises exactly 36.0 cm of 0.500 moldmhydrochloric acid.
What is the percentage of calcium carbonate in the 2.00 g piece of rock?
The percentage of Calcium carbonate in the 2.00 g piece of rock : 45%
Further explanationReaction
CaCO₃ + 2HCl ⇒ CaCl₂ +CO₂ + H₂O
V HCL = 36 cm³
M HCl = 0.5 mol/dm³
mol of HCl :
[tex]\tt 0.036~dm^3(36~cm^3)\times 0.5~mol/dm^3=0.018[/tex]
mol ratio CaCO₃ : HCl = 1 : 2, so mol CaCO₃ :
[tex]\tt \dfrac{1}{2}\times 0.018=0.009[/tex]
mass CaCO₃ (MW=100 g/mol) :
[tex]\tt 0.009\times 100=0.9~g[/tex]
The percentage of Calcium carbonate :
[tex]\tt \%mass=\dfrac{mass~CaCO_3}{mass~rock}\times 100\%\\\\\%mass=\dfrac{0.9}{2}\times 100\%=45\%[/tex]
Why do warm currents begin near the equator?
1. Ecuador recieves the most direct sunlight.
2. Scientists are not sure yet.
3. All currents, warm and cold, begin near the equator.
4. Because cold air rises and hot air descends.
Answer:
I would go with A
Explanation:
Because the earths equator is warmed by most direct rays of the sun, air a the equator is hotter than air further north or the south. The hotter air rises up at the equator and as colder air moves in to take its place, the wind begins to blow and push the ocean into waves and currents
Answer:
A
Explanation:
Because the earths equator is warmed by most direct rays of the sun which make it warm and goes up and go to cold and go down to Antarctica and come back up warm because and the most direct rays.
Atoms of the halogen family of elements typically _____ when they react.
A.give up one electron
B.gain two electrons
C.gain one electron
A student found that 3 grams of ammonia gas formed 3 grams of solid ammonia when the
temperature was lowered enough. Why did the solid ammonia and the ammonia gas have the same
mass?
Answer:
a gas can have the same weight as a solid
Explanation:
The electron configuration of an atom in the
ground state is 2-4. The total number of
occupied principal energy levels in this atom is
A) 1
B) 2
C) 3
D) 4
Answer:
2
Explanation:
The principal energy levels for an atom with a ground state electronic configuration is 2;
K L
2 4
Principal quantum number represents the main energy level in which the orbital is located or the average distance of the orbital in the nucleus.
The principal quantum number takes whole number values such; i.e;
n = 1, 2, 3, 4, 5
For the given on the principal energy levels are 2.
The total number of occupied principal energy levels in this atom is 2.
The energy levels are the locations where electrons are found and are
usually close to the nucleus. The energy levels 1s and 2s are involved and
occupied in the atom with a electronic configuration of 2-4 in its ground
state.
The 1s energy level has a maximum of 2 electrons which can fill it while the
2s energy level has a maximum of 8 electrons which can fill it.
This is why the total number of occupied principal energy levels in this atom
will be 2.
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When a rock is wrapped in aluminum foil, the radiation detected from the 29
rock significantly goes down. What type of radiation is being emitted?
beta
alpha
gamma
none of the answer choices
Answer:
gamma
Explanation:
The type of radiation that is being emitted from the rock is beta radiation.
Alpha particles are positively charged particles that are made up of two protons and two neutrons. They are the least penetrating type of radiation and can be stopped by a sheet of paper.
Beta particles are negatively charged particles that are made up of electrons. They are more penetrating than alpha particles and can be stopped by aluminum foil.
Gamma rays are high-energy photons that are not charged. They are the most penetrating type of radiation and can only be stopped by thick layers of lead or concrete.
In the case of the rock, the radiation is being stopped by the aluminum foil, which means that it must be beta radiation. Beta particles are more penetrating than alpha particles, but they are still not as penetrating as gamma rays. This means that the rock is probably not emitting gamma rays, and the only other possibility is beta radiation.
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PLS HELP I DONT UNDERSTAND
Answer:a
Explanation:i think its a
what is the only thing in nature that can be a solid, liquid, or a gas
The only thing in nature which can exists in all the three states equally is water. Water can easily interchange between gas , liquid or solid.
What is states of matter?There are three states on which matter can exist namely solids, liquid and gas. Solid state of a substance have definite shape, volume and size. In solids, molecules are closely packed and have no space in between to move apart.
In liquids, molecules have some space to move and thus they flow like water thereby have no definite shape but have definite volume. In gases, molecules have negligible intermolecular attraction and thus are far apart. Gas molecules spread over the atmosphere.
Most of the substances are usually exists any one of the state but can converted to other states. However, in nature, water is exists in all the three states as liquid water, water vapor and solid ice
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Which evidence suggests that the materials in the asthenosphere are near their melting point? Choose the correct answer.
The asthenosphere is made of lighter elements.
The temperature of core samples taken from the asthenosphere is near 500 K.
The velocity of seismic waves increases suddenly when they enter the asthenosphere.
The velocity of seismic waves decreases suddenly when they enter the asthenosphere.
Answer: The asthenosphere is made of lighter elements.
Explanation:
The asthenosphere has obtained its name from Greek word called asthenis, which mean weak. The strength of asthenosphere is lower than that of overlying lithosphere. If the temperature of lithosphere raises high enough then asthenosphere will melt. This layer is ductile and deforms very easily.
A student writes Ba²⁻ as the symbol for a barium ion. Explain what is incorrect about the symbol.
The symbol of barium ion is Ba²⁺. Barium looses two electrons and get positively charge, and it became cation.
What is cation ?Positively charged ions are known as cations. Negatively charged ions are referred to as anions. A charged atom or molecule is an ion. A balanced atom will change into a positively charged cation if one or more of its electrons are lost.
Because they are positively charged and move toward the negative electrode in an electrical field, these ions are referred to as "cations."
The barium ion has a charge of 2+, or a positive charge of two. To become a positively charged ion known as a cation, the barium ion must give up two electrons. Atoms replicate the electron configuration of the closest noble gas by transforming into ions.
Thus, To become a positively charged ion known as a cation, the barium ion must give up two electrons.
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what is radiation? like I don't know and then someone will answer they will know I'm dumb
Answer: Radiation is energy given off by matter in the form of rays or high-speed particles. ... Atoms are made up of various parts; the nucleus contains minute particles called protons and neutrons, and the atom's outer shell contains other particles called electrons.
Answer:
Radiation is energy given off by matter in the form of rays or high-speed particles. All matter is composed of atoms. Atoms are made up of various parts; the nucleus contains minute particles called protons and neutrons, and the atom's outer shell contains other particles called electrons.
Explanation:
My mom studies this so, if you have any other questions, feel free to ask me! <3
HELP QUICK 20 points
Answer:
Deep sea trenches
Explanation:
someone help please :)
6.79 x 10⁶
Further explanationScientific Notation consists of 2 parts
1. the first part: the first digit followed by the decimal point
2. The second part: the power of 10 (the exponents).which shows the number of digits after the decimal point
To add/subtract, the exponents must be the same and then add/subtract the coefficient
convert the largest exponent[tex]\tt 7.2\times 10^6\rightarrow 72\times 10^5[/tex]
subtract the coefficients[tex]\tt =(72-4.1)\times 10^5\\\\=67.9\times 10^5\rightarrow 6.79\times 10^6[/tex]
How many atoms are found in the chemical formula below
Nac
4.
3
2
1
Can y’all help me please
Answer:
2 atoms
Explanation:
There are 2 atoms in element NaCl. This is because there is 1 atom of Na (sodium) and 1 atom of Cl (chlorine) in each NaCl molecule. Elements by themselves do not have a "number of atoms"- if you're talking about the atomic number, it's the number of protons (or electrons in a neutral atom) of an element.
what is not consider a property of substance
Answer:
f
Explanation:
PLEASE HEP QUICK!! I'M BEING TIMED!!
1. _____ - the phase change in which a substance changes from a liquid into a gas.
25 points
Vaporization
Condensation
Heat of vaporization
Evaporation
2. _____ - the process that changes a substance from a liquid to a gas at temperatures below the substances boiling point.
25 points
Heat of vaporization
Vaporization
Evaporation
Condensation
3. _____ - the energy a substance must absorb in order to change from a liquid to a gas.
25 points
Vaporization
Evaporation
Heat of vaporization
Condensation
4. The arrangement of molecules in water becomes less orderly as water melts and _____ orderly as water freezes.
25 points
more
less
Other:
Answer:
Evaporation, conensation, Heat of vaporization, more
Explanation:
im pretty sure this is correct
Answer: create a question.
Explanation:
which of the following is correct?!!
THIS dUe NOW HELP PLS
2.34 L of N2 is how many molecules of N2
Answer:
1.44
⋅
10
24
molecules
N
2
Explanation:
Using Avogadro's constant of 1 mole is equal to
6.02810
23
molecules, we can convert moles to molecules.
2.4
m
o
l
N
2
⋅
6.02810
23
m
l
c
s
N
2
1
m
o
l
N
2
2.4
m
o
l
N
2
⋅
6.02810
23
m
l
c
s
N
2
1
m
o
l
N
2
1.44
⋅
10
24
molecules
N
2
This would means that there would be
2.88
⋅
10
24
atoms
N
2
as there are two atoms of Nitrogen in each of the molecules.
Explanation:
Given 1.40 moles of gold (Au), how many atoms do you have?
Answer:
8.428 × 10²³ atomsExplanation:
The number of atoms of Au can be found by using the formula
N = n × Lwhere n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
N = 1.40 × 6.02 × 10²³
We have the final answer as
8.428 × 10²³ atomsHope this helps you
pls dont just guest this is a test
Answer:
#3
Explanation:
What is the frequency of a radio station that has an energy of 5.96 x 10^(-26) J. (h = 6.6262 × 10^ (-34) J•s
A. 3.95 × 10^(-57) Hz
B. 1.79 × 10^(-17) Hz
C. 3.00 × 10^8 Hz
D. 8.99 × 10^7 Hz
Answer:
d
Explanation:
math
5. The diagram helow represents a particle traveling
through an electric field.
Positively
charged
plate
Particle -
+ + + + +
I
Negatively
charged
plate
Which particle remains undeflected when passing
through this electric field?
A) proton
B) electron
C) neutron
D) positron
Answer:
C) neutron
Explanation:
The particles that remains undeflected when passing through this electric field are the neutrons because they do not carry any charges on them.
Neutrons are uncharged particles. Since they do not have any charges on them, they are not affected by the electric field. Both protons and electrons are deflected by the electric field. The charges on these particles causes them to be deflected.The particle which remains undeflected when passing through this electric field is:
C) neutronThe given diagram shows the particle traveling through a field and there are positively, negatively and neutral charged ions.
As a result of this, we can see that the neutron does not get deflected as it is passing through the electric field because they do not have any charge in them and as such cannot be drawn by the electric charge.
Therefore, the correct answer is option C
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