Answer:
D,B
Explanation:
there are 79 elements in gold
Ill give you guys brainly and 50 points please answer im struggling
Answer:
check the image
Explanation:
Convert 85.02g to mg (1 mg=10^-3g)
Answer:
85,020 milligrams
Explanation:
Multiply the mass value by 1,000
There is a structure of CH3CHCH2CH2CH3, with a –CH3 group attached to the second (from left to right) carbon.
Spell out the full name of the compound
Explanation:
2-methyl pentane
At first, we need to select a long chain.
Then, we should number that chain (Numbering will start from that side from which attachment is closer)
Then, For IUPAC name, at first we write the position at which substituent is attached then, name of subsitent and finally the chain name and suffix.
Here,
position of substituent = 2
name of substituent = -methyl
chain name = pent
suffix = -ane
Then,
IUPAC name is 2-methyl pentane
(IM ONLY ALOWED TO GIVE 10 POINTS) Sound travels at a speed of 330 m/s. How long does it take for the sound of thunder to travel 1745 meters?
Group of answer choices
5.28 seconds
5.28 hours
575850 seconds
189 seconds
the layering of rock horizontally is for the __________ only.
A. relative age
B. same age
C. absolute age
Answer:
A
Explanation:
8. Which object has molecules that are moving? water in a cup that is not moving, or water in the ocean
PLEASE HELP ASAP!!!
Answer:
Water in the ocean
Explanation:
The water in the ocean is always moving so all the molecules are was well
what uses the predictable rise and fall of ocean water.
1. If a solution of sodium chloride has 22.3 g of
NaCl, and a volume of 2.00 L, what is its molarity?
We are given:
Mass of NaCl in the given solution = 22.3 grams
Volume of the given solution = 2 L
Number of Moles of NaCl:
We know that the number of moles = Given mass / Molar mass
Number of moles = 22.3 / 58.44 = 0.382 moles
Molarity of NaCl in the Given solution:
We know that Molarity of a solution = Moles of Solute / Volume of Solution(in L)
Molarity = 0.382 / 2
Molarity = 0.191 M
HELP !!!!
The area where pests hide is called:
a hot zone
a hamlet
a homeland
a harborage
Answer:
a harborage!
Explanation:
Explain why HCl can be a strong electrolyte, but a dilute HCl solution can be a poor conductor?
Answer:
Because as the concentration is diminished, the capacity to transfer electricity is diminished as well.
Explanation:
Hello!
In this case, since electrolytes are substances that are able to conduct the electricity in aqueous media (solutions in which water is the the solvent) because they have the capacity to form ions with both positive and negative charges, due to the fact that HCl is a strong acid, we notice it is fully ionized in solution and therefore it is a strong electrolyte. However, when the concentration is diminished, we can notice that strength is diminished as well because less ions will have the capacity to transfer the electricity and therefore it'd become a poor conductor or weak electrolyte.
Best regards!
Help!
What is the molar mass of oxygen (O2)?
A- 15.9994 g/mol
B- 1.204 x 1024 g/mol
C- 6.02 x 1023 g/mol
D- 31.9988 g/mol
Answer:
Answer:
15.9994 g/mol
Radiation that travels across distances in
the form of waves is which of the
following?
A. matter
B. a cell
C. a vacuum
D. energy
Answer:
i think the answer is D. energy
Explanation:
WHAT TYPE OF REACTION IS HAPPENING WITH NI2O3 (s) Ni (s) + O2 (g)
Answer:
Decomposition.
Explanation:
Hello!
In this case, since we can find four types of reactions, combination, decomposition, single displacement and double displacement, for the reaction:
2NI2O3 (s) --> 4Ni (s) + 3O2 (g)
We can evidence that the reactant (only one) is separated into the elements forming it; therefore, we infer this is a decomposition reaction.
Best regards!
Hat is the answer for this
Answer:
C
Explanation:
Answer:
I think is A
Explanation:
Hope it helps
10 POINTS PLS HELP
Combustion occurs when _____.
oxidation reactions are very slow
oxidation reactions are so fast the substance catches fire
oxygen is removed from another substance
machines use chemical energy to do work
Answer: oxidation reactions are so fast the substance catches fire
Explanation:
Answer:
When oxidation reactions are so fast the substance catches fire
Explanation:
because i am big bwain
Can someone please help me quick !!!
Calculate the molarity of 4.07 x 10^2 mL of solution containing 19.4 g of potassium iodide.
Answer: 0.287 M
Explanation:
Molarity is [tex]M=\frac{n}{v}[/tex]. n is moles or solute and v is volume of solution in liters. Since we are given the grams of potassium iodide, we want to convert that into moles. With the volume in mL, we want to convert that to liters.
[tex]19.4 g*\frac{1 mol}{166.0028g} =0.1169 mol[/tex]
[tex]4.07*10^2mL*\frac{1L}{1000mL} =0.407 L[/tex]
Now that we have moles and liters, we can find molarity.
[tex]M=\frac{0.1169mol}{0.407L} =0.287 M[/tex]
Now, we know the molarity is 0.287 M.
1. The molarity of a solution of 6.0 g of KCl in 80. mL of solution is ________
Answer:
1.0 M of KCl
Explanation:
First off, we're given 6.0 g of KCl. From here, we just find the molar mass of KCl by adding the molar masses of each element in the compound. The molar mass for the potassium is 39 g/mol, and the chlorine is 34 g/mol (all found on periodic table). We add those to find the compounds molar mass, which turns out to be 73 grams/ mole.
From here, we need to convert grams to moles so we multiply the grams by the molar mass so that we cancel out grams and only leave behind moles ( 6.0 grams x 1 mole/73 grams ≈ 0.08 moles).
From here, we need to find the amount of liters in the solution, considering that the Molarity (M) is the same equation as mol/ Liter. To find this, we must convert similar units so that they work, in this case, we must convert milliliters to liters. We know that 1000 milliliters are equal to 1 liter, therefore like what we did with the molar mass and grams, we must cancel out milliliter so we only have liters ( 80 mL x 1 L / 1000 mL= 0.08 L)
From here, we divide the moles by the liters in order to make the molarity. The reason why is because as said before, M is equal to mol/L
(0.08 moles / 0.08 L = 1.0 M)
I hope this helped you and good luck with your semester in Chemistry!
Plsss help I will be giving branliest to most helpful answer
Name the EXOTHERMIC phase changing process in the diagram below:
Answer:
it's most likely liquid to gas, solid to gas, and solid to liquid
Explanation:
How do you determine whether an acid should be broken up into ions in the
complete ionic equation?
Answer:
When chemicals in solution react, the proper way of writing the chemical formulas of the dissolved ionic compounds is in terms of the dissociated ions, not the complete ionic formula. A complete ionic equation is a chemical equation in which the dissolved ionic compounds are written as separated ions.
Which of the following contain ionic bonds? (select all that apply)
options:
FeCl3
CO
KI
CaSe
N2S
CO2
RbI
PCl3
Answer:
fecl3 contains ionic bonds
How many milliliters of 2.00 M H2SO4 will react with 28.0 g of NaOH?
Taking into account the reaction stoichiometry and the definition of molarity, 175 mL of 2 M H₂SO₄ will react with 28.0 g of NaOH.
Reaction stoichiometryIn first place, the balanced reaction is:
H₂SO₄ + 2 NaOH → Na₂SO₄ + 2 H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
H₂SO₄: 1 moleNaOH: 2 moles Na₂SO₄: 1 moleH₂O: 2 molesThe molar mass of the compounds is:
H₂SO₄: 98 g/moleNaOH: 40 g/moleNa₂SO₄: 142 g/moleH₂O: 18 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
H₂SO₄: 1 mole× 98 g/mole= 98 gramsNaOH: 2 moles× 40 g/mole= 80 gramsNa₂SO₄: 1 mole× 142 g/mole= 142 gramsH₂O: 2 moles× 18 g/mole= 36 gramsDefinition of molarityMolar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:
[tex]Molarity= \frac{number of moles}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
Moles of H₂SO₄ requiredThe following rule of three can be applied: If by reaction stoichiometry 80 grams of NaOH react with 1 mole of H₂SO₄, 28 grams of NaOH react with how many moles of H₂SO₄?
[tex]moles of H_{2}S O_{4} =\frac{28 grams of NaOHx1 mole ofH_{2}S O_{4} }{80 grams of NaOH}[/tex]
moles of H₂SO₄= 0.35 moles
Volume of H₂SO₄ requiredIn this case, you know:
Molarity= 2 M= 2 [tex]\frac{moles}{liter}[/tex]amount of moles= 0.35 molesReplacing in the definition of molarity:
[tex]2 \frac{moles}{liter}= \frac{0.35 moles}{volume}[/tex]
Solving:
2 [tex]\frac{moles}{liter}[/tex] × volume= 0.35 moles
volume= 0.35 moles ÷ 2 [tex]\frac{moles}{liter}[/tex]
volume= 0.175 liters= 175 mL (being 1 L= 1000 mL)
Finally, 175 mL of 2 M H₂SO₄ will react with 28.0 g of NaOH.
Learn more about
the reaction stoichiometry:
brainly.com/question/24741074
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molarity:
brainly.com/question/9324116
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brainly.com/question/7429224
#SPJ1
The definition of having to do with the physical properties and terrain of an area refers to the
term
environmental
forecasting
meticulous
topographical
adjacent
Answer:
Topographical
Explanation:
When it comes to questions such as this one, the thing that could help you the most is a dictionary. A dictionary is an alphabetically arranged listing of words that contains various information about those words, such as their definitions, examples, origin, pronunciation, etc.
The term the given definition refers to is topographical. Topography is the study of the forms and features of land surfaces. The topography of an area refers to its physical properties and terrain or their description (e.g. how they're shown on a map).
Pleaseee answer need help
Answer:
I think its protons
Explanation:
Electrons usually seem like the right answer but since electrons are negative and so our neutrons so its protons.
2. Which test for iron(II) ions is conclusive
Answer:
please brainlist answer
Explanation:
The addition of K 3 Fe(CN) 6 to a solution causes the formation of a deep blue precipitate which indicates that iron(II) ions are present.
The conclusive test for iron(II) ions is the test by the use of potassium hexacyanoferrate III solution.
In qualitative analysis certain reagents are used to test for the presence of certain cations or anions. Those reagents react in a certain way with those reagents. Usually, a positive test may involve a color change, formation of a precipitate or evolution of a gas.
In the case of iron(II) ions, potassium hexacyanoferrate III solution is used in the conclusive qualitative test for the ion. A positive test involves the appearance of a deep blue precipitate.
Learn more: https://brainly.com/question/6955504
BRAINLIEST + 20 POINTS
What will occur if two reactant molecules collide but do not have the right alignment?
Answer:
Contents Home Courses University of California Davis UCD Chem 2C: General Chemistry III UCD Chem 2C: Larsen Text Unit 4: Chemical Kinetics Expand/collapse global location
4.7: Collision Theory
Last updatedSep 3, 2020
4.6: Using Graphs to Determine (Integrated) Rate Laws
4.8: Temperature and Rate
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Learning Objectives
Molecules must collide in order to react.
In order to effectively initiate a reaction, collisions must be sufficiently energetic (kinetic energy) to break chemical bonds; this energy is known as the activation energy.
As the temperature rises, molecules move faster and collide more vigorously, greatly increasing the likelihood of bond breakage upon collision.
Collision theory explains why different reactions occur at different rates, and suggests ways to change the rate of a reaction. Collision theory states that for a chemical reaction to occur, the reacting particles must collide with one another. The rate of the reaction depends on the frequency of collisions. The theory also tells us that reacting particles often collide without reacting. For collisions to be successful, reacting particles must (1) collide with (2) sufficient energy, and (3) with the proper orientation.
mark me as brainly
Answer:
It cannot collide as all molecules don't touch each other but if it does i don't know sorry
Explanation:
Automobile air bags use the decomposition of sodium azide as their sources of gas for rapid inflation, represented in the reaction below. What mass (in grams) of NaN4is required to provide 40.0 L of N2 at 25°C and 763 torr?
Answer:
The answer is 95 degree celcius
Rank the following chemical species from largest ionic radius to smallest ionic radius
V^3+, V^5+, V^4+, V^2+
Answer:
Biggest Radii V²⁺ > V³⁺ > V⁴⁺ > V⁵⁺ Smallest Radii
General Formulas and Concepts:
Periodic Trends: Atomic/Ionic RadiiCoulomb's LawExplanation:
The Periodic Trend for Atomic Radii is down and to the left. Therefore, the element with the largest radius would be in the bottom left corner of the Periodic Table.
Anions will always have a bigger radii than the parent radii. When we add e⁻ to the element, we are increasing the e⁻/e⁻ repulsions. This will cause e⁻ to repel themselves more and thus create more space, increasing the radii size.
Cations will always have smaller radii than the parent radii. When we remove e⁻ from the element, we are decreasing e⁻/e⁻ repulsions. Since there are less e⁻, there is no need for more space and thus decreases the radii size.
Since Cations are smaller than the parent radii, the more e⁻ we remove, the smaller it will become.
Therefore, the least removed e⁻ Vanadium would be the largest and the most removed e⁻ Vanadium would be the smallest.
PLSS HELPS ME!!!!!!
Upwellings are the result of
A. the Coriolis effect.
B. gyres in the open ocean.
C. changes in the shape of coastlines.
D. wind and vertical movement of surface waters.
Answer:
it must be the answer C.
hope you have a nice day
hope it will help you
