Answer:
18 neutrons
Explanation:
In the element;
₁₇Cl
The number of electrons in the chlorine atom is 17.
The mass number of chlorine is 35.
Mass number is the number of protons plus number of neutrons.
Mass number = Protons + neutrons
Neutrons = mass number - protons
Number of protons in chlorine is 17;
So;
Neutrons = 35 - 17 = 18
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.
Find more on spiracles:
https://brainly.com/question/4523662
#SPJ2
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.
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
what is not consider a property of substance
Answer:
f
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
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.
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
Which of the following compounds is most ionic?
a. Mgo
b. LiBr
C. HCI
d. CaCl2
Answer: CaCl2
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
HELP QUICK 20 points
Answer:
Deep sea trenches
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.
Read more on https://brainly.com/question/19297300
THIS dUe NOW HELP PLS
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 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
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:
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
HELP ME PLEASE ASAP. I'LL MARK YOU BRAINLIEST
ITS NUMBER 23.
Answer:
The answer is A
Explanation:
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]
PLS HELP I DONT UNDERSTAND
Answer:a
Explanation:i think its a
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.
To learn more about radiation, here
https://brainly.com/question/31106159
#SPJ2
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]
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
which of the following is correct?!!
pls dont just guest this is a test
Answer:
#3
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
To find more on states of matter, refer here:
https://brainly.com/question/29476563
#SPJ6
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:
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:
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:
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
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:
