Answer:
hey
Explanation:
Answer:
I'm really not sure
Explanation:
So there's the answer
0.5 g of salt is dissolved in 25 g of water. Calculate the percentage amount of salt in the solution.
What is the molarity of a NaCl solution with 3.7 moles and 2.3 L?*
Answer:
5.0 molatrity
Explanation:
because i just known
Answer:
Approximately 1.61
Explanation:
Molarity = Moles/Liters
Molariry = 3.7 moles NaCl / 2.3L
Molariry = 1.61
If 11 moles of A are combined with 16 moles of B and the reaction occurs to the greatest extent possible, how many moles of C form?
What state of matter has indefinite volume and is compressible?
a. Gas
B. Liquid
C. Both Liquid and Gas
D. Solid
An independent country in which people share a common culture is called
an aristocracy.
an ethnic group.
a nation-state.
a polity.
PLease help
When may a scientific theory be revised?
Answer:
it can be revised at any time.
Explanation:
Answer: Multiple answers to this question. This is what I comprehend.
Explanation:
Upon analysis of the results, a theory can be rejected or modified, but it can never be proven to be correct 100 percent of the time. For example, relativity has been tested many times, so it is generally accepted as true, but there could be an instance, which has not been encountered, where it is not true.
1. The polymerization of amino acids produces:
organic acids
lipids
proteins
carbohydrates
2. Which group of compounds has a –OH functional group?
aldehydes
esters
carboxyl acids
alcohols
3. Unsaturated compounds _____.
do not readily react
have a high activation energy
require UV light to react
are very reactive
4. Butene would have ____ carbon atoms and a_____ bond.
- 4 - double
- 2 - single
Answer:
1. Proteins
2. Alcohol
3. Unsaturated compounds are very reactive.
4. Butene has 4 carbon atoms and one double bonds attached to it
Explanation:
1. The polymerization of amino acids gives protein.
Polymerization is a process whereby smaller unit molecules of organic compounds combine repeatedly, in a regular fashion to form a larger organic structure or compound.
The smaller units are called monomers while the larger compound formed are called the polymers.
In this case, the smaller units are the amino acids held or linked together by peptide bonds to form a polymer called proteins.
2.
Compounds with functional group of -OH are called alcohols.
Alcohols are also known as alkanols and they belong to a class of organic compounds where -OH functional group is attached to an alkyl group. They have general formula of CₓH₂ₓ₊₁OH where x refers to the number of carbon atom. They're also categorized into primary, secondary and tertiary alcohols based on the type of carbon in the which the functional group (-OH) is attached to.
3.
Unsaturated compounds are very reactive due to the presence of lone pairs of electrons present in them.
4. Butene actually has 4 carbon atoms and several single bonds attached to it.
Butene has a total of 12 bonds and 1π (pi-bond) while several 11σ (sigma bonds) are attached to it.
Which molecule is butyne?
Answer:
The answer is B.
Explanation:
A P E X
review the types of elements that create ionic bonds as
well as the types of elements that create covalent bonds.
• N2 • CCl4 • SiO2
• AlCl3 • CaCl2 • LiBr
Answer:
N2 Covalent
CCl4 Covalent
SiO2 Covalent
AlCl3 Covalent
CaCl2 Ionic
LiBr Covalent
Explanation:
With covalent bonds, there is a sharing of electron pairs between the atoms.
With ionic bonds, there is complete transfer of valence electrons between atoms. Formed by the interaction of a metal with a non-metal.
Where:
Electrons aren't transferred in covalent bonds.
Protons aren't transferred in covalent bonds
Protons aren't shared in covalent bonds
N3-
C4+
Cl-
Si4+ = Metal
O2- = Non-metal
Al3+ = Metal
Li+ = Metal
Ca2+ = Metal
Br 1-, 1+, 5+ = Halogen
N2 = N3- and N3- Covalent
CCl4 = C4+ and Cl- x4 Covalent
SiO2 = Si4+ and O2- x 2 Metal with non metal Covalent
AlCl3 = Al3+ and Cl- x 3 Covalent Though this one is complex as to why because it seems like it should be ionic
CaCl2 = Ca2+ and Cl- x 2 Metal with non-metal Ionic
LiBr = Li+ and Br- Covalent as neither is a non-metal
A salt is made by adding an excess of an insoluble metal oxide to an acid.
How can the excess metal oxide be removed? *
D filtration
B crystallisation
A chromatography
C distillation
Answer:
Filtration
Explanation:
Filtration is used to separate solid substances from liquids or large molecules from small molecules. Since, Acid is a liquid and metal oxide is solid so Filtration can be used to separate these two.
TRUE OR FALSE
As the human population increases, demand for natural resources will also increase.
Which structural formula represents an isomer?
Answer: 4
Explanation: same amt of Hs Cs and Cls
The Option 4 has same number of atoms but arranged differently so it is the isomer of the given compound.
What is an Isomer ?Isomers are compounds that contain exactly the same number of atoms, i.e., they have exactly the same empirical formula, but differ from each other by the way in which the atoms are arranged.
By the definition of Isomer we can understand that we have to look for a compound that has same number of Carbon , Hydrogen and Chlorine atoms as that given .
Number of Carbon atoms = 3
Number of Hydrogen atoms = 6
Number of Chlorine atoms = 2
It can be seen that there are same number of Carbon , Hydrogen and Chlorine atoms in the fourth option , so Option 4 is the correct answer.
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When electrons are filling energy levels, the lowest energy sublevels are
occupied first. This is
A. None of these
B. The Aufbau principle
C. Hund's rule
D. Conservation of energy
Reset Selection
which solute will result in a molecular solution?
a. HCN
b. Ba(OH)2
c. CH3COOH
d. CH3CH2OH
Answer:
d. CH3CH2OH
Explanation:
Molecular solution are solutions when a molecular compound is dissolved in them.
CH3CH2OH represents Ethanol or alcohol carrying "OH" group and is a molecule. CH3CH2OH or Ethanol forms a molecular solution in water.
The equation for Ethanol dissolving in water as follows:
CH3CH2OH(l) => CH3CH2OH(aq)
CH3CH2OH srays together as molecules. During dissolving, ethanol molecule fit into spaces between water molecules and completely mix with water.
While HCN, CH3COOH and Ba(OH)2 form ionic solution.
Hence, the correct option is d. CH3CH2OH.
Question 1 of 23
The diagram below shows two mugs of coffee mug A and mug B). Both mugs have the same temperature, but mug A contains 30 ml, while mug B contains 5
thermal energy in both mugs?
B
30°C
30°C
.ll Lisa ko
30 ml
5 ml
O Mug A has more thermal energy than mug B
O Mug A has less thermal energy than mug B
O Mug A and B have the same thermal energy
Previous Question
Flag for re
Answer:
mug A has more thermal energy
Explanation:
Where does a wolf get energy from?
Where does a rabbit get energy from?
Where does a plant get energy from?
Where does a mushroom get energy from?
Answer:
Check Explanation
Explanation:
In this case the Mushroom would get energy from decomposing dead plants and animals in the soil/ground
The plant would get energy from the sun (simplified)
the rabbit would get energy from eating the plant
in this case the wolf would energy from eating the rabbit but in a normal setting the wolf could get energy from eating any animal
Answer:
Explanation: A wolf gets its energy from food and water
A rabbit gets its energy from food and water too
A plant get it energy from sunlight, rain
A mushroom also get its energy from dead plant/animal’s
If this wasn’t the answer you wanted I’m sorry
When balanced, which equation would have the coefficient 3 in front of any of the reactants? Zn + HCl ZnCl2 + H2 H2SO4 + B(OH)3 B2(SO4)3 + H2O Fe + AgNO3 Fe(NO3)2 + Ag C2H4O2 + O2 CO2 +H2O
Answer:
b
Explanation:
i got it right on edge
To balance a reaction means to make the number of atoms the same on both the reactants and products side. The steps for balancing is as follows:-
Balance the Metal firstThen balance the HydrogenBalance the oxygen at lastAccording to the question, there are third reactions. the reaction third has the 3 coefficient before the compound.
The balanced reaction is as follows:-
[tex]3H_2So_4 + 2B (OH)_3------->B_2(So_4)_3 + 6H_2O[/tex]
Hence the correct compound is[tex]3H_2SO_4[/tex].
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A 390 mL solutions of 4.6 M HCl is left out over the weekend and 74 mL of solvent evaporates. What is the new concentration of HCl?
Answer:
5.7 M
Explanation:
You have .390 L of 4.6 M HCl.
.390 L * 4.6 mol/L = 1.794 mol HCl
.390-.074=.316 L solvent remaining
1.794 mol/.316 L=5.7 M HCl
Need help on #1 thank youu!
Answer:
Oil---> Wood---> Water
Explanation:
Denser things always go on bottom. Since oil is on top is the least dense among those, and then comes wood and then finally water.
What is the answer to this I need help please
Answer : The boron-11 isotope is the most abundant.
Explanation :
As we are given that:
Average atomic mass of boron = 10.81 amu
Mass of boron-10 = 10.0129 amu
Mass of boron-11 = 11.0093 amu
As we know that the average atomic mass of an element is always closest to the most abundant isotope.
Out of the two boron isotopes, B-11 is closest in mass to the weighted average. Therefore, it is the most abundant.
Hence, the boron-11 isotope is the most abundant.
What’s the answer to this?
Answer : The balanced chemical reaction will be:
[tex]3Ca(s)+2Al(NO_2)_3(aq)\rightarrow 2Al(s)+3Ca(NO_2)_2(aq)[/tex]
Explanation :
Balanced chemical reaction : It is defined as the reaction in which the number of atoms of individual elements present on reactant side must be equal to the product side.
When solid calcium metal reacts with aqueous aluminum nitrate then it gives aqueous calcium nitrate and solid aluminium.
The balanced chemical reaction will be:
[tex]3Ca(s)+2Al(NO_2)_3(aq)\rightarrow 2Al(s)+3Ca(NO_2)_2(aq)[/tex]
Which statement best describes the process that the diagrams show?
A solid loses kinetic energy to become a liquid and then becomes a gas
A solid gains kinetic energy to become a liquid and then becomes a gas,
Agas loses kinetic energy to become a liquid and then becomes a solid
Agas gains kinetic energy to become a liquid and then becomes a solid
Answer:Agas loses kinetic energy to become a liquid and then becomes a solid
i believe i had this before but where is the graph
Explanation:
please mark this answer as brainlest
B. A solid gains kinetic energy to become a liquid and then becomes a gas
What is a chemical reaction?
a. a process of bonding substances together
B. a process that leads to have filled valence shells
following the octet rule
C. a process that releases or consumes energy
D. all of the choices
Answer:
D.
Explanation:
this is because in a chemical reaction all 3 of those work.
Answer:
A chemical reaction is defined as per encyclopedia Britannia as a "a process in which one or more substances, are converted to one or more different substances, the products."
So A is correct, B is correct, C is correct.
So that means we choose D as they're all correct.
Match the description to the correct term. If the description matches both terms, use
"both" for your answer.
Cause(s) the temperature of
the surroundings to
decrease.
Cause(s) a change in the
temperature of the
surroundings.
Cracking open a cold-pack.
Burning Wood
Absorb(s) energy from the
surroundings.
Cause(s) the temperature of
the surroundings to increase.
Release(s) energy to the
surroundings.
1. Endothermic reaction
2. Exothermic reaction
3. Both
Answer:
Cause(s) the temperature of the surroundings to decrease. - 1. Endothermic reaction.
Cause(s) a change in the temperature of the surroundings. - 3. Both.
Cracking open a cold-pack. - 1. Endothermic reaction.
Burning Wood. - 2. Exothermic reaction.
Absorb(s) energy from the surroundings. - 1. Endothermic reaction.
Cause(s) the temperature of the surroundings to increase. - 2. Exothermic reaction.
Release(s) energy to the surroundings. - 2. Exothermic reaction.
Which of the following atoms has the largest atomic radius? Provide an explanation
a Hydrogen
b. Sodium
C Lithium
d Rubidium
Answer:
d Rubidium
Explanation:
The atomic radius of an atom is the distance from the center of the nucleus to its outermost electron.
The atomic radius of elements varies in the periodic table, it increases as you go down in a group and decreases along the period from left to right.
All the elements listed: Hydrogen, Sodium, Lithium and Rubidium belong to the same group in the periodic table (group 1), Since atomic radius increases from top to bottom in a group, Rubidium has the largest atomic radius.
hii:) how to do (c)?
Answer:
C
Explanation:
C shows a mixture of CO2 and H2O, 2 compounds
Answer:
C
Explanation:
C shows a mixture of CO2 and H2O, 2 compounds
HELP ME ILL GIVE YOU 40 POINTS JUST HELP MEEEEEEEEEEE
What causes blood pressure?
A.the strength of the muscles in the walls of the capillaries
B.the speed at which oxygen is returned to blood in the lungs
C. the force with which the ventricles contract
D. the rate at which blood flows through the heart
Answer:
C
Explanation:
What causes blood pressure?
C
To pump blood around the body, the heart contracts and then relaxes through the cardiac cycle. The cycle begins with the contraction of the two atria, which push blood into the ventricles. Then, the ventricles contract, which forces the blood out of the heart.
When the heart pushes blood around the body during systole, the pressure placed on the vessels increases. This is called systolic pressure.
When the heart relaxes between beats and refills with blood, the blood pressure drops. This is called diastolic pressure.
Classify the elements as diatomic or monatomic. If necessary, refer to the periodic table to help you identify the diatomic elements.
carbon
helium
hydrogen
iodine
oxygen
sodium
Answer:
carbon- monatomic
helium- monatomic
hydrogen- diatomic
iodine- diatomic
oxygen- diatomic
sodium- monatomic
Explanation:
the diatomic elements can be remembered with this sentence:
Have No Fear Of Ice Clear Brownies
have- hydrogen
no- nitrogen
fear- fluorine
of- oxygen
ice- iodine
clear- chlorine
brownies- bromine
The diatomic molecules are hydrogen ,iodine ,oxygen while the monoatomic molecules are carbon, helium and sodium.
What are elements?It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.
Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.
The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.
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A student is trying to dissolve 20 grams of sugar in a beaker containing 250 milliliters of water at room temperature. What can the student do to make the sugar dissolve faster in the water?
Answer:
They can warm up the water. Sugar dissolves much faster in warm/hot water.
A perfect example of this is when you put sugar in your hot coffee/tea -> it will dissolve almost immediately. If you put sugar in cold water, you will have to stir it for quite some time before it dissolves.
For addition and subtraction, round the result to
match the measurement with the fewest decimal
places. For example,
3.4 cm + 4.75 cm = 8.2 cm
because 3.4 cm is only measured to the nearest
0.1 centimeter.
Choose the answer with the correct number of
significant digits.
4.6 cm + 2.35 cm =
v cm
Answer:
7.0
Explanation:
second question is 4.90 third question is 3.0 fourth question is 6.6
Answer:
The first answer is 4.6 cm + 2.35 cm = 7.0 cm
The second answer is 8.45 cm – 3.55 cm = 4.90 cm
The third answer is 1.2 cm × 2.54 cm = 3.0 cm^2
Then the last answer is 6.6 cm^3 ÷ 1.00 cm^2 = 6.6 cm
I hope this helps, Its correct on edge 2020 :)