Answer: Chromium 2)8)8)6
Copper 2)8)8)8)3
Explanation:
The positive sign of the energy difference in a chemical reaction would indicate that ..........
A) the chemicals are losing energy to the surroundings.
B) the chemicals are gaining energy from the surroundings.
Answer:
B) the chemicals are gaining energy from the surroundings.
Explanation:
The positive sign of the energy difference in a chemical reaction would indicate that the chemicals are gaining energy from the surroundings. This is what happens in an endothermic reaction.
In an endothermic reaction, heat is absorbed from the surroundings hence the surrounding becomes colder at the end of the changes.
Here the energy change is assigned a positive value. This is because the heat energy level of the final state is higher than that of the initial state. So, the difference gives a positive value.6. Imagine you are riding a bike, and you hit a large rock in your path. The
rock puts external force on your bike. Which of the following is likely to
happen according to Newton's First Law of Motion?
A. Your bike stops moving forward
B. Your body flies forward.
C. The rock may move backward
D. All of the above
According to Newton's first law of motion,if a large rock hits the bike your body will fly forward as an external force is acting on it.
What is motion?Motion is defined as a phenomenon which is described with respect to change in object's position with respect to time.It is given in terms of displacement,velocity,distance ,acceleration,speed.
Branch of physics which deals with motion of objects without any reference to it's cause is called kinematics while the branch which studies forces and their effects on motion is called as dynamics.
Motion applies to various systems like objects,bodies, matter particles ,radiation ,curvature.There are three laws of motion which are proposed by Newton.Classical mechanics is based on Newton's law of motion.Relativistic mechanics is based on modern kinematics.
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HELPPP PLZZZZ :( ONLY ANSWER IF U ACUALLY KNOOOW ALL
Answer:
Net: 1N
Explanation:
1.) Net:1N, direction: left
2.) Net: 1N, direction: down
3.) Net: 0N, no motion
4.) Net: 1N, direction: up
5.) Net: 1N, direction: up
Gene flow adds genetic __________ to a population.
Answer:
Genetic Variation
Explanation:
Gene flow — also called migration — is any movement of individuals, and/or the genetic material they carry, from one population to another. ... If gene versions are carried to a population where those gene versions previously did not exist, gene flow can be a very important source of genetic variation.
Define the law of conservation of mass and what do we do in order to follow the conservation of mass
Answer: The Law of Conservation of Mass
In other words, the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction. If we account for all reactants and products in a chemical reaction, the total mass will be the same at any point in time in any closed system.
In a chemical reaction, mass can neither be created nor be destroyed.
HELP QUICKLY BRAINLIEST I WILL GIVE
What is the difference between a divergent boundary and a convergent boundary?
Divergent boundaries slide past each other horizontally, and convergent boundaries form mountain ranges and ocean trenches.
Divergent boundaries slide past each other horizontally, and convergent boundaries form mountain ranges and ocean trenches.
Divergent boundaries run into each other, and convergent boundaries pull away from each other.
Divergent boundaries run into each other, and convergent boundaries pull away from each other.
Divergent boundaries pull away from each other, and convergent boundaries run into each other.
Divergent boundaries pull away from each other, and convergent boundaries run into each other.
Divergent boundaries form mountain ranges, and convergent boundaries slide past each other horizontall
Answswer its a
Explanation:
i don't think it's any of these because divergent boundaries pull away from each other and convergent boundaries run into each other.
Questioned document examiners prefer to work with copies of a questioned document in order to avoid damage to the original
material.
O True
O False
1.33*10^ 23 molecules of carbon dioxide to moles
Answer:
0.22moles of carbon dioxide
Explanation:
Given parameters:
Number of molecules of carbon dioxide = 1.33 x 10²³molecules
Unknown:
Number of moles = ?
Solution:
To solve this problem, we use the relationship below:
1 mole of a substance contains 6.02 x 10²³moleccules;
So;
1.33 x 10²³molecules will contain [tex]\frac{1.33 x 10^{23} }{6.02 x 10^{23} }[/tex] = 0.22moles of carbon dioxide
Please help fast. I will give brainliest!!!
Answer:
Reaction #4
Explanation:
Generally, combustion reactions produce water and carbon dioxide, and the fourth answer choice is the only one that produces both of these compounds. Therefore, the fourth answer choice is the only one that can be a combustion reaction.
How many moles of hydrogen are required to produce 50 moles of methanol
Answer:
search it up ;)
Explanation:
THIS IS DUE IN 20 MINUTES!!!!
Which of the following is an example of absolute dating?
A. A sedimentary rock layer is between 10,000 and 10,500 years old.
B. A sedimentary rock layer is younger than the existing layer below it.
C. A sedimentary rock layer is 20,000 years old because it is a scientific law.
D. A sedimentary rock layer contains fish fossils, but the layers above and below it do not contain any fossils.
Answer:
aa
Explanation:
Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Therefore, the correct option is option A.
What is matter?Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.
Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.
So as we saw that matter has some mass so mass can be measured in gram only. Mass can also be represented as number of molecules. We also saw that matter occupy some volume and that volume is measured only in liter. A sedimentary rock layer is between 10,000 and 10,500 years old. Sedimentary rock is a type of rock.
Therefore, the correct option is option A.
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write the equilibrium expression for the following reaction.based upon the value of k,would there be more or less product in the equilibrium mixture?why?
CaO(s)+CH4(g)+2H2O(g) ⇄ CaCO3(s)+4H2(g) kp=2344
Answer: [tex]K_p=\frac{[H_2]^4}{[CH_4]^1[H_2O]^2}[/tex]
As value of K is greater than 1, the reaction is forward driven.
Explanation:
Equilibrium constant is defined as the ratio of concentration of products to the concentration of reactants each raised to the power their stoichiometric ratios. For equilibrium constant in terms of pressure , only gaseous reactants and products are considered.
For the given chemical reaction:
[tex]CaO(s)+CH_4(g)+2H_2O(g)\rightleftharpoons CaCO_3(s)+4H_2(g)[/tex]
The expression for [tex]K_p[/tex] is written as:
[tex]K_p=\frac{[H_2]^4}{[CH_4]^1[H_2O]^2}[/tex]
As > 1, the reaction will be favoured in the forward direction and thus more products will be there.
Calculate the percentage of yield when 20 grams of sodium chloride solution reacts with an excess amount of silver nitrate solution knowing that 45 grams of silver chloride precipitated
%yield = 91.8
Further explanationGiven
20 g NaCl
45 g AgCl
Required
%yield
Solution
Reaction
NaCl + AgNO₃ ⇒ AgCl + NaNO₃
mol NaCl :
= mass : MW
= 20 g : 58,44 g/mol
= 0.342
mol AgCl from equation :
= 1/1 x mol NaCl
= 1/1 x 0.342
= 0.342
Mass AgCl(theoretical) :
= mol x MW
= 0.342 x 143,32 g/mol
= 49.02 g
%yield = (actual/theoretical) x 100%
%yield = (45/49.02) x 100%
%yield = 91.8
Percentage % yield = 91.8%
Given:
20 g NaCl
45 g AgCl
To find:
% yield=?
The balanced chemical equation will be:
NaCl + AgNO₃ ⇒ AgCl + NaNO₃
First, we need to calculate moles of NaCl.
[tex]\text{Number of Moles}=\frac{\text{Given Mass}}{\text{Molar Mass}} \\\\\text{Number of Moles}=\frac{20}{58.44} \\\\\text{Number of Moles}= 0.342 moles[/tex]
Then, calculate moles of AgCl from equation:
[tex]\text{mol of AgCl}= 1/1 * \text{ mol NaCl}\\\\\text{mol of AgCl}= 1/1 * 0.342\\\\\text{mol of AgCl}= 0.342[/tex]
Mass AgCl(theoretical) :
[tex]\text{Mass of AgCl}= mol * MW\\\\\text{Mass of AgCl}= 0.342 x 143,32 g/mol\\\\\text{Mass of AgCl}= 49.02 g[/tex]
Now, calculate for percentage yield.
[tex]\%yield =\frac{actual}{theoretical} * 100\%\\\\\%yield = (45/49.02) * 100\%\\\\\%yield = 91.8\%[/tex]
The percentage yield will be 91.8%.
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how many grams of oxygen are needed to form 122 g of aluminum oxide?
Mass of O₂ needed : = 57.408 g
Further explanationGiven
122 g of Aluminum oxide
Required
Mass of Oxygen
Solution
Reaction
4Al + 3O₂ → 2Al₂O₃
Mol Al₂O₃(MW=102 g/mol) :
= mass : MW
= 122 g : 102 g/mol
= 1.196
From the equation, mol ratio of O₂ : Al₂O₃ = 3 : 2, so mol O₂ :
= 3/2 x mol Al₂O₃
= 3/2 x 1.196
= 1.794
Mass O₂ (MW = 32 g/mol) :
= mol x MW
= 1.794 x 32
= 57.408 g
A dune buggy winds over sand dunes in the desert, going a distance of 1500 meters in 180 seconds. What is the average speed, in meters per second rounded to the nearest hundredth, of the dune buggy?
Answer:
8.33 meters per second
Explanation:
1500 meters/180 seconds=1500/180=8.3333 meters per second
Why can't store gases in open containers
Answer:
They may react in the air and become an acidic gases.
pls help with give brainiest Which statement best explains why the sun's
why is ethanol a member of the homologous series of alcohols but propane is not
I’m in the exam!
Answer:
I hope it helps..... you can stop at the full-stop
_________ is the movement of materials across a cell membrane using cellular energy.
Passive Transport
Active Transport
Answer:
active transport
Explanation:
passive transport does not involve energy
How many molecules are in 2 moles of O2?
Answer:
Approx 32g
Explanation:
Oxygen has an atomic weight of 15.999. Times to is 32g
helpppppppppppppppppppppppppp meh pls
Answer: positive energy
Explanation: goggle it bro
18. Which factor does NOT affect weather?
1. mountains
2. phases of the moon
3. cloud cover
4. large bodies of water
Answer:
mountains
Explanation:
mountains is the answer because mountains are just there doing nothing
At the energy-generating station, the coal is burned. Burning
changes, the coal's chemical energy into sound energy.
true or
false
Answer:
The correct answer is - false.
Explanation:
At the energy-generating station, when the coal is burned, the chemical energy store in the coal converted into thermal energy and light or luminous energy.
The thermic energy generated used to heat and boil the water or liquid to generate the gas and generate the kinetic energy to move the fan that is desgined to generate the electrical energy.
Thus, the statment is false statement as it does not convert into sound energy.
28 moles of butane and 228 moles of oxygen are used in the
following reaction. Identify the limiting reagent.
C4H8 + O2 + CO2 + H2O
-butane
-oxygen
-either of the two reactants can be used as a limiting reagent
-none of the above
O₂ as a limiting reactant
Further explanationGiven
28 moles of butene
228 moles of Oxygen
Required
Limiting reactant
Solution
We use the basis for the given reaction because for the name butane it should have the formula C₄H₁₀, while C₄H₈ is butene
Reaction(balanced)
C₄H₈ + 6 O₂ → 4 CO₂ + 4 H₂O
Find limitng reactant from mol : coefficient of reactants
C₄H₈ : 28 : 1 = 28
O₂ : 228 : 6 = 38
O₂ as a limiting reactant (smaller ratio)
The total number of atoms in the formula aluminum acetate is
a. 15
b. 22
c. 9
d. 10
e. 13
will give branliest and 100 points I guess? please be quick though
Answer:
B) 22 atoms
Explanation:
Aluminum Acetate has a formula of C6H9AlO6, meaning that it has 6 Carbon atoms, 9 Hydrogen atoms, 1 Aluminum atom, and 6 Oxygen atoms.
In total there are: 6+9+1+6 atoms, or a total of 22 atoms.
Hope this helps!
Answer:
The molecular or chemical formula of Aluminium Acetate is C6H9AlO6.
6-carbon atoms
9-hydrogen atoms
6-oxygen atoms
1-aluminium atom
Therefore the total number of atoms in the formula aluminum acetate is (6+9+6+1)= 22 atoms.b. 22 is the right answer
A 2.5 molar solution contains 0.97 g of NaOH. What would be the volume of this
solution in mL?
Answer:
9.7 ml
Explanation:
Molarity = 2.5 M
Mass = 0.97g
Volume = ?
The relationship between these quantities is;
Molarity = Number of moles / Volume
Number of moles = Mass / Molar mass
Molar mass of NaOH = 40g/mol
Number of moles = 0.97 / 40 = 0.02425 mol
Volume = Number of moles / Molarity = 0.02425 / 2.5 = 0.0097 L
1000 ml = 1L
x = 0.0097 L
x = 0.0097 * 1000 = 9.7 ml
Which of the following is/are chemical changes? Select all that apply.
1. water boiling
2. vinegar and baking soda mixing and creating bubbles
3. dumping baking soda into water
4. a bike rusting while it sits outside
What is the mass, in grams, of one mole of any substance known as?
A. atomic mass
B. molar mass
C. molecular weight
D. atomic number
The answer is B. the molar mass.
The molar mass of a chemical compound is defined as the mass of a sample of that compound divided by the amount of substance in that sample, measured in moles.
Write the scientific term.
The number of grams of solute dissolved in 100 g of the solvent to form a saturated solution at STP
Answer: Solubility.
Explanation:
Solubility is defined as the maximum amount of solute dissolved per 100 g of the solvent at a certain fixed temperature to form a saturated solution.
STP condition is Standard Temperature and Pressure condition which is temperature of 273 K and pressure of 1 atm.
Thus the scientific term for "the number of grams of solute dissolved in 100 g of the solvent to form a saturated solution at STP" is called as Solubility.
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