Answer:
physical
Explanation:
this is a physical action to create a change. does not involve chemicals or elements
Answer:
[tex]\boxed {\boxed {\sf Physical \ change}}[/tex]
Explanation:
A chemical change, as the name suggests, must result from a change in the chemical makeup and new substances are produced. A very common example is metal rusting.
A physical change can be observed without a change in chemical composition. No new substances are produces. Ripping paper and an ice cube melting are physical changes.
A rubber band stretching is a physical change. No new substances are made and the chemical makeup remains the same.
Which of the following compounds is most ionic?
a. Mgo
b. LiBr
C. HCI
d. CaCl2
Answer: CaCl2
Explanation:
How are the atoms in a liquid different from the atoms in a solid?
O liquid atoms are more tightly packed and move slower
O liquid atoms are less tightly packed and move faster
liquid atoms are more tightly packed and move faster
liquid atoms are less tightly packed and move slower
Answer:
liquid atoms are less tightly packed and move faster
What do insects use to get oxygen? A. lungs B. spiracles C. gills D. stomata
Answer:
B spiracles
Explanation:
These are the tubes connected to the openings in their sides
Insects use tiny openings in their body wall called spiracles to get oxygen. They are also called tracheal tubes. Hence, option B is correct.
What is insect spiracles ?An insect's inside functions almost like a sponge. Because a sponge has tiny holes that allow water to enter, it becomes moist. Spiracles are similar to this. They allowed oxygen to enter the bug's body. They then release carbon dioxide.
Insects can open and close their spiracles . This is accomplished through certain muscles . To drive oxygen through their bodies, insects can also contract their muscles. The oxygen inside them is spread out by doing this.
Stomata is the reparatory organ in plants and gills are the organ in aquatic livings for respiration. In mammals lungs are the respiratory organ. Therefore, option B is correct.
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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
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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Which question would be scientifically reasonable for a student to ask about the layers of the Earth?
A. Why does the temperature decrease as you move from the crust to the core?
B. Why does density increase as you move from the crust to the core?
C. Why does density decrease as you move from the crust to the core?
D. Why is the inner core liquid iron and the outer core solid iron?
Answer:
The answer is C
Explanation:
Which pair of elements forms the most ionic bond? Refer to the periodic table.
A) K and CI
B) Be and CI
C) Li and CI
D) O and CI
Answer:
KCl
Explanation:
Look at the electronegativity differences between the pairs of elements:
KCl: 3.16 - 0.82 = 2.34
BeCl: 3.16 - 1.57 = 1.59
LiCl: 3.16 - 0.98 = 2.18
ClO: 3.44 - 3.16 = 0.28
KCl has the highest electronegativity difference; thus it is the most ionic bond of the 4.
Answer:
b barium and chlorine
Explanation:
chemical bond formed between 2 oppositely charged ions
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]
In which direction does water move across membranes, up or down the concentration gradient?
Answer:
If a membrane is permeable to water, though not to a solute, water will equalize its own concentration by diffusing to the side of lower water concentration
Explanation:
How many molecules make up 8.41 moles of Ca2(SO3)?
Answer: ??? molecules Ca2(SO3) (no rounding; make sure to include scientific notation when necessary)
Answer:
5.06282 × 10²⁴ moleculesExplanation:
The number of molecules of Ca2(SO3) 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 = 8.41 × 6.02 × 10²³
We have the final answer as
5.06282 × 10²⁴ moleculesHope this helps you
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]
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
PLEASE HELP!!!!!!!!!!
How does the words used in a text help the theme, setting, and plot?
HELP ME PLEASE ASAP. I'LL MARK YOU BRAINLIEST
ITS NUMBER 23.
Answer:
The answer is A
Explanation:
which of the following is correct?!!
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
pls dont just guest this is a test
Answer:
#3
Explanation:
Atoms of the halogen family of elements typically _____ when they react.
A.give up one electron
B.gain two electrons
C.gain one electron
46.0 g of barium nitrate is dissolved in 360 g of water. What is the percent concentration of the barium nitrate solute in the solution?
Pls help with answer I don’t get it
The percent concentration of the Barium nitrate : 11.33%
Further explanationThe concentration of a substance can be expressed in several quantities such as moles, percent (%) weight/volume,), molarity, molality, parts per million (ppm) or mole fraction. The concentration shows the amount of solute in a unit of the amount of solvent.
[tex]\tt \%mass=\dfrac{mass~solute}{mass~solution}\times 100\%[/tex]
mass solute=mass Barium nitrate(Ba(NO₃)₂)=46 g
mass solvent=mass water=360 g
mass solution=mass solute+mass solvent=46+360=406 g
[tex]\tt \%mass=\dfrac{46}{406}\times 100\%\\\\\%mass=\boxed{\bold{11.33\%}}[/tex]
what is not consider a property of substance
Answer:
f
Explanation:
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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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:
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
PLS HELP I DONT UNDERSTAND
Answer:a
Explanation:i think its a
Describe a composite volcano. Use the following terms in your response: silica-rich, eruption, and crater.
Answer: A composite volcano is the most common type of volcano. They have non-explosion and explosion eruptions. There crater is big, or small. They are also called Stratovolcanoes.
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:
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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THIS dUe NOW HELP PLS
2Al + 6HCl → 2AlCl3 + 3H2
If the chemical reaction produces 129 grams of AlCl3, how many grams of H2 are also produced?
Answer: The reaction produces 2.93 g H₂.
M_r: 133.34 2.016
2Al + 6HCl → 2AlCl₃ + 3H₂
Moles of AlCl₃ = 129 g AlCl₃ × (1 mol AlCl₃/133.34 g AlCl₃) = 0.9675 mol AlCl₃
Moles of H₂ = 0.9675 mol AlCl₃ × (3 mol H₂/2 mol AlCl₃) = 1.451 mol H₂
Mass of H₂ = 1.451 mol H₂ × (2.016 g H₂/1 mol H₂) = 2.93 g H₂
Explanation:
What color would litmus paper turn in a solution of baking soda? Explain your answer in terms of pH.
