PLS HELPPPP OMG PLSPLSPLSPLSPLS
Answer:
D 44.8 L liters of hydrogen gas
RIGHT ANSWERS ONLY !!!
Answer:
450.0
Explanation:
Answer:
16km
sorry if it is wrong they change things up a lot
Explanation:
In experiment B, the iron filings weighed 2.0 g at the beginning of the experiment and the iron sulfide produced weighed 2.8 g. Explain this increase in mass
Answer:
The increase in mass is because the iron fillings have combined with a sulfide to produce iron sulfide and so the mass will increase.
In such a reaction like this, the mass of the reactants must be conserved. By so doing, the mass of reactants and products must be the same.
When two substances combine together, their masses added up to that of the individual masses. This helps to conserve the mass.
Explanation:
The increase in mass is because the iron fillings have combined with a sulfide to produce iron sulfide and so the mass will increase.
In such a reaction like this, the mass of the reactants must be conserved. By so doing, the mass of reactants and products must be the same.
When two substances combine together, their masses added up to that of the individual masses. This helps to conserve the mass.
Describe the pattern of the Lewis dot structures of the first 18 elements (include periods and groups/families)?
Answer:
The Lewis dot structures of elements in the same group are the same (except that the name of the element is shown in the structure) while for elements in the same period it increases by one from left to right.
Explanation:
Lewis dot structures are the structures which represent the valence electrons of an atom. The dots in the structure represent electrons in the valence shell of the atom.
Elements in the periodic table are arranged into groups and periods. The groups are the vertical columns whereas the periods are the horizontal rows. The first 18 elements of the periodic table are Hydrogen(H), Helium (He), Lithium (Li), Beryllium (Be), Boron (B), Carbon (C), Nitrogen (N), Oxygen (O), Fluorine (F), Neon(Ne), Sodium (Na), Magnesium (Mg), Aluminum (Al), Silicon (Si), Phosphorous (P), Sulfur (S), Chlorine (Cl) and Argon (Ar). They are found within Groups IA to VIIIA, as well as from period 1 to 3 in the periodic table. elements in group IA have one valence electron; elements in group IIA has two, IIIA has three, IVA has four, VA has five, VIIA has six, VIIA has seven, while VIIIA has eight valence electrons.
Elements in the same group have the same number of valence electrons while the valence electrons of elements in the same period increase by one from left to right. Therefore, the Lewis dot structures of elements in the same group are the same (except that the name of the element is shown in the structure) while for elements in the same period it increases by one from left to right.
The Lewis dot structure of the first 18 elements is shown in the attachment below.
how many moles of manganese are in 1 mole of manganese(iv) permanganate
Answer:
4 moles...................
Silver nitrate, AgNO3, is which type of matter?
A. Element B. Compound C. Heterogeneous mixture D. Homogeneous mixture
Silver nitrate, AgNO₃ is a compound which is a type of matter as it is made up of more than one type of element.
What is a compound?
Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
Learn more about compounds,here:
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1. Calculate the elevated boiling point of a solution containing 10.0g of sodium chloride
dissolved in 200g of water.
Answer:
100.44 oC (0.438 oC increase in BP)
Explanation:
Pb(NO3)2
how do i solve this
You can see the periodic table one by one.
Pb(NO3)2 = PbN2O6
So there are
1Pb
2N
6O
and so you find the molecular mass from the periodic table and add all the numbers
Molacular mass of
Pb = 207
N = 14
O = 16
multiply it with the number of atoms
1Pb = 207 × 1 = 207
2N = 14 × 2 = 28
6O = 16 × 6 = 96
Molecular mass total = 207 + 28 + 96 = 331
So the molecular mass is 331.
Alkaline solutions have pH values below 7.
true or false ?
Answer:
It is false
Explanation:
ph value below 7 are acidic, and ph values above 7 are alkaline (basic)
can someone please help!? i’ll mark you as brainliest
Answer:
26
Explanation:
Answer:
Reactants: NaBr and CA(OH)2
Products: CaBr and NaOH
Explanation:
Reactants are always on th left side of the equation and products on the right side
Which substance do plants use to capture light energy from the sun? a) Carbon dioxide b) Chlorophyll c) Glucose d) Oxygen
Answer: chlorophyll
Explanation:
The substance that plants use to capture light energy from the sun is referred to as chlorophyll.
The chlorophyll is a colored pigment that is used by the plants for photosynthesis. The function of the chlorophyll is that it absorbs the energy from the sun which is then turned into a chemical energy.
Answer:
I don't know the answer to this either
Explanation:
sorry:(
Give the number of protons, electrons and neutrons in one atom of Carbon.
Answer:
6 protons, 6 neutrons, and 6 electrons.
Explanation:
Determine the block of the element Iron which has 26 atomic number:
Answer:
ok
Explanation:
Answer:
Iron
Explanation:
In a sample of double-stranded DNA, 12% of the nitrogenous bases are guanine (G). What percentage of the nitrogenous bases in the sample are cytosine
Answer:
12%
Explanation:
The percentage of Guanine and Cytosine in DNA are equal to each other, as one molecule of guanine bonds with one molecule of cytosine.
If 12% of the nitrogenous bases are guanine, then another 12% will be Cytosine.Conversely, the percentage of adenine and thymine in DNA are equal to each other.
advantages of solar energy
How to study for a chemistry exam?
Answer:
post it notes ,snacks , or any think that u love to do or eat when u get it right u can eat it
Help ASAP I will mark brainliest for the correct answer !!!⚡️✨
Answer:
10623 km
Explanation:
3541 x 3 hours
What is the mass of 3.2×10²³ molecules of CH4?
Answer:
Mass? Molar mass? Grams? Or Mols?
What state does a maple tree enter during the winter?
A. thigmotropism
B. migration
C. hydrotropism
D. dormancy
please help, I'm lost
HELP PLEASE
When ice changes into water, it is an example of a ___________ change. Also, when water changes into water vapor, it is an example of a _________ change.
A. physical...physical
B. chemical...chemical
C. physical...chemical
D. chemical...physical
PLEASE HELP ASAP IT URGENT!!!!!!!!
Answer: IT IS D
Explanation:
How does the temperature of the air cause a breeze to blow toward the land?
Answer:
The warm air over the land will rise throughout the day, causing low pressure at the surface. Over the water, high surface pressure will form because of the colder air. ... The wind will blow from the higher pressure over the water to lower pressure over the land causing the sea breeze.
Explanation:
PLZ MARK AS BRAINLEST!!!What is the equation and molecular weight of Scandium (II) Sulfite? Not sulfide
Explanation:
Molecular Formula
S3Sc2
Synonyms
Scandium sulfide
Scandium sulfide (Sc2S3)
Discandium trisulphide
Molecular Weight
186.1 g/mol
How does skin defend the body against pathogens?
A. It destroys pathogens with digestive acids.
B. It produces white blood cells that attack pathogens.
C. It blocks pathogens from getting inside the body.
D. It uses tiny hairs to trap pathogens.
Chemical bonds release energy when they break apart, and take in energy when they form. How does this observation help explain the energy released by burning wood?
How many grams of gasoline were
burned if 1.63 x 1023 molecules of
water were produced? Only report
number (no units) and use correct sig
figs.
Answer:
31.0 g C8H18
Explanation:
Gasoline is equivalent to C8H18
to convert molecule to gram you have to convert molecules to mols first.
Using Avocado's number we can figure that out.
(1.63 x 10²³ molecules C8H18) (1 mol C8H18/ 6.022 x 10²³) = 0.271 mols C8H18
Then we convert mols to grams using the molar mass of C8H18
C - 8(12.011) = 96.088 g/mol
H - 18(1.008) = 18.144 g/mol
add that together: 114.232 g/mol
(0.271 mol C8H18) (114.232 g/ 1 mol C8H18) = 31.0 g
31.0 g C8H18
P.S: SORRY IF THIS DOESNT HELP!! I dont know if they are talking about the actual formula for gasoline.
On a 310 K day, soda is being carbonated in a factory.
a. A 0.031 m
pressure device receives a measurement of 9900 N from the gases in
the soda bottle. What is the pressure of the gases in the soda bottle?
b. Since soda contains water, 47.1 mm Hg of the pressure in the bottle is from water
vapor. What is the pressure of the Co2 in the bottle?
c. Before the CO2 is added to the soda, it's stored in a 1849 L container at 50 atm
and 310 K.
i. How many moles of CO, can fit in the container?
ii. Unfortunately, an accident (blame Steve), dents the container, reducing its
volume to 1399 L. If the number of moles and temperature are still
constant, what is the new pressure?
iii. The factory repairs the container so it's back to its original conditions.
However, the container is weakened, so if the pressure reaches 75 atm it
will burst. If the number of moles and volume are constant, at what
temperature does this burst happen?
What happens to the air as a stove heats it? This question is about thermal expansion and convection, not “it gets hot”.
20 points for answering
Answer:
When there is heat at the bottom of this air or water, the air or water molecules in contact with the heat start to move, and the molecules spread apart. The heated air or water becomes less dense. It rises up until it gets to air or water with the same density as it has, and when it gets there, it pushes the air or water that was there out of the way. At the same time, new air or water fills the space that was vacated when the heated molecules rose up. The air or water that gets pushed out of the way falls down. This sets up a circular motion. Air or water is heated at the bottom, travels to the top, cools, gets denser, falls, is heated again and the whole cycle starts again. Convection does not occur in space because there is no gravity. Ovens work by convection. The heating coils at the bottom of the oven heat the air which climbs to the top, cools slightly, and falls down again.
Explanation:
Helpppppppp I will mark brainliest
Answer:
9.8 m/s squared
Explanation: