Answers
Explanation:
A physical change, such as a state change or dissolving, does not create a new substance, but a chemical change does.
In a chemical reaction, the atoms and molecules that interact with each other are called reactants.
In a chemical reaction, the atoms and molecules produced by the reaction are called products.
In a chemical reaction, only the atoms present in the reactants can end up in the products. No new atoms are created, and no atoms are destroyed.
In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.
Answer:
It is B
Explanation:
The formation of water is a chemical reaction which rearranges atoms. The other reactions are nuclear reactions.
Related Questions
True or False?
When it is summer in the Northern Hemisphere, it is summer all around the word
Answers
If a book has a weight of 23.2 N on Earth, what is its mass?
Answers
Answer: Mass is 2,37 kg
Explanation: Weight G = mg, and g = 9.81 m/s² on Earth.
m = W/g = 23.2 N / 9.81 m/s²
what does climate change have to do with glacial change
Answers
Answer:
Because glaciers are so sensitive to temperature fluctuations accompanying climate change. so if it gets hotter then the ice glaciers will melt.
Explanation:
If 2.28 g C8H18 reacts with 7.00 g of Oz, predict the mass of CO, that can be produced and
identify the limiting reactant. Explain how you got your answers.
Unbalanced equation: C8H180 + 026) • CO26) + H₂O
Answers
Answer:
O₂ is limiting reactant and 6.17g CO₂ can be produced
Explanation:
Based on the balanced reaction:
C₈H₁₈ + 25/2O₂ → 8CO₂ + 9H₂O
1 mole of C₈H₁₈ reacts with 25/2 moles O₂.
To solve this question we must convert the mass of each reactant to moles and, using the balanced reaction, we can find limiting reactant. With moles of limiting reactant we can find the moles of CO₂ and its mass as follows:
Moles C₈H₁₈ -Molar mass: 114.23g/mol-
2.28g * (1mol / 114.23g) = 0.0200 moles C₈H₁₈
Moles O₂ -Molar mass: 32g/mol-
7.00g * (1mol / 32g) = 0.219 moles O₂
For a complete reaction of 0.0200 moles C₈H₁₈ are needed:
0.0200 moles C₈H₁₈ * (25/2moles O₂ / 1mole C₈H₁₈) = 0.250 moles of O₂ are needed.
As there are just 0.219 moles, O₂ is limiting reactant.
Moles of CO₂ that can be produced:
0.219 moles O₂ * (8moles CO₂ / 25/2moles O₂) = 0.140 moles CO₂
The mass is -Molar mass CO₂: 44.01g/mol-:
0.140 moles CO₂ * (44.01g / mol) =
6.17g CO₂ can be producedHow many electrons does GeH4 have
Answers
Ge has 32 electrons. H has 1 electron.
32 + 1(4) = 36
ILL MARK BRAINLIEST :)
Describe the law of conservation of mass in your own words *DO IT IN YOUR OWN WORDS PLEASE*
Answers
Explanation:
According to the law of conservation of mass, mass can neither be created nor destroyed but it can simply be transformed from one form to another.
For example, [tex]Na^{+} + Cl^{-} \rightarrow NaCl[/tex]
Mass of Na = 23 g/mol
Mass of Cl = 35.5 g/mol
Sum of mass of reactants = mass of Na + mass of Cl
= 23 + 35.5 g/mol
= 58.5 g/mol
Mass of product formed is as follows.
Mass of NaCl = mass of Na + mass of Cl
= (23 g/mol + 35.5) g/mol
= 58.5 g/mol
As mass reacted is equal to the amount of mass formed. This shows that mass is conserved.
As a result, law of conservation of mass is obeyed.
If the half-life of a radioactive substance is 500 million years and you have 48 atoms of it, how many half-lives will have passed by the time that 6 atoms of the substance remain?
O A. 3
O B. 2
O C. 4
O D. 5
Answers
Answer: 3
Explanation:
What is the hydroxide ion concentration of a solution with a pH of 4?
A. 1x10^-4
B. 1x10^-7
C. 1x10^-14
D. 1x10^-10
Answers
Answer:
Jules
Explanation:
How many moles are in 2.8x10^24 atoms of silicon?
Answers
Answer:
4.6 mol Si
General Formulas and Concepts:
Atomic Structure
Reading a Periodic TableMolesAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:
Step 1: Define
[Given] 2.8 × 10²⁴ atoms Si
[Solve] moles Si
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
[DA] Set up: [tex]\displaystyle 2.8 \cdot 10^{24} \ atoms \ Si(\frac{1 \ mol \ Si}{6.022 \cdot 10^{23} \ atoms \ Si})[/tex][DA] Divide [Cancel like units]: [tex]\displaystyle 4.64962 \ mol \ Si[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
4.64962 mol Si ≈ 4.6 mol Si
20. Which of the following is the correct name for N205?
O nitrate oxide
O dinitrogen pentoxide
O nitrous oxide
O nitrogen dioxide
Answers
Answer:
B!
Explanation:
Di stnds for 2 (N2)
pent = 5 (05)
How many grams of copper (II) oxide will react with 10 liters of hydrogen gas?
Answers
Answer:
maybe 200g
I don't know thats just a guess
HOPE ITS TURE
Organisms that depend on other organisms for food are consumers. Which consumer you think is a herbivore (eats plants only)?
Answers
Answer:
Prairie dog#3
Explanation:
:)
how many carbon atoms are in 26-hydrogen alkyne
Answers
When 0.875 g. of magnesium was heated in air, 1.25 g. of magnesium oxide
(MgO) was produced. How much oxygen must be added?
Answers
Answer:
1. What is the coefficient for calcium in the balanced equation?
2 Ca + 5 NaOH → 4 Na + 2 Ca(OH)2
2. The burning of 20.0 g of acetylene (C2H2) produces what mass of carbon dioxide? You must
write the equation, balance it and solve the mass-mass problem.
a. Balanced equation:
2 C2H2 + 5 O2 4 CO2 + 2 H2O
Explanation:
Birds use their feathers for flight and fluff their feathers to keep warm. Based on Natalia's feather experiment, how do oil spills affect birds’ ability to use their feathers?
Answers
Answer:
As shown previously on Natalia's experiment, oil spills will dangerously affect birds' abilities to user their feathers. When oil gets on a feather, the mass of it increases and it becomes soggy and wet. If birds try to go in water like the ocean, it will not get any better because the ocean is cold. Flying won't be easy because they have additional weight stuck to them.
Explanation:
Hope this helps you!
Write the formulas for the following compounds :
Sodium phosphate
Phosphorus triiodide
Answers
phosphorus triiodide = PI3
hope this helps. make brainliest please!
Explanation:
1.Na3PO4
2.PI3
therefore this is the formula for sodium phosphate and phosphrous triiodide
Help please At which boundary type would mountains, such as the Himalayans, most likely form?
Question 6 options:
Divergent
Convergent
Transform
Slip Fault
Answers
Answer:
convergent is the answer
When you mix water and salt you get a.
Answers
What do plants do with sugar? *
Release it through their stoma
Eat it for energy
Convert it into oxigen
Convert it into water
Answers
Answer:
its B .Eat it for energy.
How is entropy related to the spontaneity of a reaction? AP3X
Answers
Answer:
S>0 contributes to spontaneity.
Explanation:
i just took the test on a pex :)
According to the law of thermodynamics, the relationship between entropy and the spontaneity of a reaction is S > 0.
What is entropy?Entropy is the total amount of energy in a closed system that is present there, but there are no uses for that energy. It is the unused energy for any work.
By the second law of thermodynamics, any spontaneous process results in an increase in the universe's overall entropy. The total of the entropy produced by the spontaneous process and the change in energy brought on by the heat flow is known as the net change in entropy of the system or S.
The reaction will be spontaneous if the delta G is negative. Delta G is the Gibbs free energy. So the entropy S will be greater that the reaction.
The Gibbs free energy equation is:
△G = △H − T△S
Thus, the relation is S > 0.
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A heterogeneous mixture always contains
only one substance.
O more than two substances.
O two or more substances that are visibly distinguishable.
O two or more substances that are not visibly distinguishable.
Answers
Answer:
two or more substances that are visibly distinguishable.
Is this correct??Pls help!!!
Answers
Answer:
C
Explanation:
Answer:
Yes, your answer is correct. B is correct :3
Water and oil are "immiscible", meaning they do not mix but stay
separated when combined in a glass. What is the best explanation for this?
1.both are polar molecules
2.both are nonpolar molecules
3.water is a polar molecule and oil is a nonpolar molecule
4.water and oil are both compounds
Answers
Answer:
Good luck man
Explanation:
Good luck man
If I have 6 moles of a gas at a pressure of 10.6 atm and a volume of 48 liters, what is the temperature of this gas?
An unknown quantity of gas is at a pressure of 14.5 atm, a volume of 45 liters, and a temperature of 97 0C, how many moles of gas exist in this situation?
Answers
Answer: 1). The temperature of this gas is 1032.88 K.
2). There are 21.48 moles of gas exist at a pressure of 14.5 atm, a volume of 45 liters, and a temperature of [tex]97^{o}C[/tex].
Explanation:
1). Given: No. of moles = 6 moles
Pressure = 10.6 atm
Volume = 48 L
Formula used to calculate temperature is as follows.
PV = nRT
where,
P = pressure
V = volume
n = no. of moles
R = gas constant = 0.0821 atm
T = temperature
Substitute the values into above formula as follows.
[tex]PV = nRT\\10.6 atm \times 48 L = 6 mol \times 0.0821 L atm/mol K \times T\\T = \frac{10.6 atm \times 48 L}{6 mol \times 0.0821 L atm/mol K}\\= \frac{508.8}{0.4926} K\\= 1032.88 K[/tex]
Hence, temperature of this gas is 1032.88 K.
2). Given: Pressure = 14.5 atm
Volume = 45 L
Temperature = [tex]97^{o}C = (97 + 273) K = 370 K[/tex]
Formula used to calculate number of moles is as follows.
[tex]PV = nRT\\14.5 atm \times 45 L = n \times 0.0821 L atm/mol K \times 370 K\\n = \frac{14.5 atm \times 45 L}{0.0821 L atm/mol K \times 370 K}\\= \frac{652.5}{30.377} mol\\= 21.48 mol[/tex]
Hence, there are 21.48 moles of gas exist at a pressure of 14.5 atm, a volume of 45 liters, and a temperature of [tex]97^{o}C[/tex].
The best way to increase the amount of a solid solute dissolved in a saturated solution would be to
Answers
Answer:
The solubility of a saturated solution can be increased by increasing the temperature.
Explanation:
Temperature -- Generally, an increase in the temperature of the solution increases the solubility of a solid solute. For example, a greater amount of sugar will dissolve in warm water than in cold water. A few solid solutes, however, are less soluble in warmer solutions.
On the left a Circuit A, which is a square box. The top, left, and right sides have circles with X's in them. The bottom side has a stack of vertical lines, which are from left to right very short, short, very short, short. On the right a Circuit B, which is a square box. 2 extra lines cross the box near its top, parallel with the top side. The top side and the 2 extra lines have circles with X's in them. The bottom side has a stack of vertical lines, which are from left to right very short, short, very short, short.
Use the diagram and drop-down menus to answer each question.
Which circuit is a parallel circuit?
Which circuit is a series circuit?
In which circuit do the light bulbs all shine at their maximum brightness?
Answers
Answer:
B A B sorry if its wrong
Explanation:
Circuits can be connected in series or parallel but the maximum voltage is obtained in series connection, thus, light bulbs shine brightest in series connection.
What is parallel and series connection in a circuit?A parallel circuit connection is one in which the terminals of all the components in th circuit meet at two points.
The components are parallel to each other and current flows in multiple directions.
A series connection in a circuit is one in which the terminals of the component parts in a circuit are joined end to end. Current flows in one direction.
The voltage in a series connection is the sum of all the individual cells, therefore, the light bulb in series connection shines brightest.
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how many layer does the earth have?
Answers
Answer:
The earth is split into four major layers: the crust, the mantle, the outer core and the inner core
Explanation:
What is the definition of bond (in chemistry) ?
Answers
Answer:
Bond is a force that binds two atoms together.
A car engine produces 604 kJ of mechanical energy from fuel capable of producing 2416 kJ of energy. The efficiency of the engine is
Answers
A car engine produces 604 kJ of mechanical energy from fuel capable of producing 2416 kJ of energy, then efficiency of the engine is 25%.
How do we calculate efficiency?We can calculate the efficiency by using the below equation as:
Efficiency = (Actual production / Theoretical production) × 100%
Given that,
Actual production = 604 kJ
Theoretical production = 2,416 kJ
On putting values in given equation, we get
Efficiency = (604/2,416) × 100% = 25%
Hence efficiency of the engine is 25%.
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How do textbooks usually describe Le Châtelier's famous principle
Answers
Answer:is an observation about chemical equilibria of reactions. It states that changes in the temperature, pressure, volume, or concentration of a system will result in predictable and opposing changes in the system
Explanation: