Answers
Answer:
it's a day I think so ........
Answer:
Lunar cycle
Explanation:
Year is the amount of time for the Earth to rotate a complete circle around the sun.
Lunar cycle (moon phases) is the rotation of the Moon around the Earth.
Day is the time for the Earth to rotate on its own axis completely.
Solar cycle is the changes that the sun's electric field goes through about every 11 years.
Related Questions
What value is equivalent to 7.2 kilograms
Answers
Answer: 15.8732828773 pounds
Explanation:
please help me please
Answers
Answer:
Two advantages are: Its cheap and it is a renewable energy source. Two disadvantages are it's not windy everyday and it will take up a lot of space for windmills.
Explanation:
Why is a rotting apple a reaction in which energy is neither absorbed nor released?
A. The chemical energy in the reactants is almost equal to the chemical energy in the products.
B. The chemical energy in the reactants is much greater than the chemical energy in the products.
C. The chemical energy in the reactants is much less than the chemical energy in the products.
( don’t send links, I won’t click them)
Answers
What is the empirical formula for C6H12?
Answers
Answer:
The empirical formula of C6 H12,
Given the following skeleton equation, what are the coefficients for the chemicals in the reaction? __ FeSO4 + __ Al(OH)3 → __ Al2(SO4)3 + __ Fe(OH)2
Answers
Answer:
3 FeSO4 + 2 Al(OH)3 -> 1 Al2(SO4)3 + 3 Fe(OH)2
Explanation:
Why do we test for free chlorine in drinking water?
Answers
Answer:
The presence of free chlorine in drinking water is correlated with the absence of most disease-causing organisms, and thus is a measure of the potability of water
Predict the reactants of this chemical reaction. That is, fill in the left side of the chemical equation.
______ + Cacl2 → H2O
Answers
Answer: [tex]Ca(OH)_2+2HCl\rightarrow CaCl_2+2H_2O[/tex]
Explanation:
Neutralization is a chemical reaction where an acid reacts with a base to form salt and water.
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side.
The balanced chemical equation will be:
[tex]Ca(OH)_2+2HCl\rightarrow CaCl_2+2H_2O[/tex]
Thus the reactants are calcium hydroxide [tex](Ca(OH)_2[/tex] and hydrochloric acid [tex](HCl)[/tex]
2
A student put 25.0 cm of dilute hydrochloric acid into a conical flask.
The student added 2.5g of solid sodium carbonate and measured the change in temperature of
the mixture.
Which apparatus does the student need to use to obtain the most accurate results?
A balance, measuring cylinder, thermometer
B balance, pipette, stopwatch
C balance, pipette, thermometer
D
burette, pipette, thermometer
Answers
Answer:
A balance, measuring cylinder, thermometer
Explanation:
In this experiment, three things are really required and they are;
A balance Measuring cylinderThermometerA balance is used to measure out the mass of 2.5g of solid sodium carbonate.
A measuring cylinder is used to measure out the 25.0 cm of dilute hydrochloric acid into a conical flask.
Lastly, a thermometer is used to monitor the change in temperature.
1. There are basic particles from which matter could
be made except
salt.
B
atom.
Cion.
D molecules.
Answers
Answer: Hello, There! your Answer is Below
Option A Salt
Explanation:
Salt is A Chemical Used For Varites of Purposes, So It's not Part of Matter.
Atom being the Smallest Part of Molecule And ion Are Charge Which is Part of Matter.
Hope this helps!!
Have a great day!!!
Convert 2.178×1010 g to each of the following units.
Answers
Answer:
2.178x10⁷kg, 2.178x10¹³mg, 2.178x10¹⁶μg, 2.178x10⁴ metric tons.
Explanation:
The units are kg, μg, mg and metric tons (1metric ton = 1000kg)
To solve this question we must convert, first, the grams to milligrams, and to kilograms. Then, the kilograms to metric tons and the milligrams to micrograms:
kg:
2.178x10¹⁰g * (1kg / 1000g) = 2.178x10⁷kg
mg:
2.178x10¹⁰g * (1000mg / 1g) = 2.178x10¹³mg
μg:
2.178x10¹³mg * (1000μg / 1mg) = 2.178x10¹⁶μg
metric tons:
2.178x10⁷kg * (1metric ton / 1000kg) = 2.178x10⁴ metric tons
A 108.9 g sample of water absorbs 114.6 calories of heat. The specific heat capacity of water is 1 cal/(g·°C). By how much did the temperature of this sample change, in degrees Celsius?
Answers
Answer:
The temperature of this sample changes by 1.052 degrees Celsius
Explanation:
As we know
[tex]Q = mc\Delta T[/tex]
Where m is the mass of the substance
c is the specific heat of the substance
and [tex]\Delta T[/tex] is the change in temperature
Substituting the given values in above equation, we get -
[tex]114.6 = 108.9 * 1 * \Delta T\\\Delta T = 1.052[/tex]degree Celsius
The temperature of this sample changes by 1.052 degrees Celsius
Which of the following is NOT one of the three layers that terrestrial worlds have?
Core
Crust
Mantle
Seismic zone
Answers
Match each definition to the appropriate term.
Sum of the internal energy plus the product of the pressure and volume for a reaction
The extent of randomness in a system
The condition that a reaction takes place without outside help
Difference of the enthalpy (of a system) minus the product of the entropy and absolute temperature
Solution in which no more solute can be dissolved in the solvent
Answers
Answer:
Enthalpy, Entropy, Spontaneity, Gibbs free energy, saturated solution
Explanation:
Enthalpy is defined as the heat released or the heat absorbed during the process at a constant pressure which is equal to the Enthalpy shift. Enthalpy is also called as heat content and it is the sum total of internal energy and the product of the volume and pressure of a system.
Entropy is defined as the measure of randomness of a system or the disorder of the system.
Spontaneity is defined as the condition of being spontaneous. It is the condition where a reaction takes place without any help from outside.
Gibbs free energy is defined as the energy that is used to quantify the maximum work done in a thermodynamic system at constant temperature and pressure. It is the also known as the Gibbs energy or function.
Saturated solution is defined as the solution where the maximum amount of the dissolved solute is present in the solvent. In case of a saturated solution, the extra solute does not dissolve. In order words, it is a solution where no more solute can dissolved in solvent.
The sum of the internal energy plus the product of the pressure and volume for a reaction represents Enthalpy , Entropy is the extent of randomness in a system, Spontaneity is that condition that a reaction takes place without outside help, Gibb's free energy is the difference of the enthalpy (of a system) minus the product of the entropy and absolute temperature and Saturated solution in which no more solute can be dissolved in the solvent.
Which properties will define chemical reaction?Thermodynamically chemical reactions will be define by considering the properties like entropy, enthalpy, free energy, internal energy, temperature and many more.
Enthalpy of the reaction tells about the total amount of heat released or absorbed during a chemical reaction, and it is calculated as sum of the internal energy plus the product of the pressure and volume for a reaction.Entropy of any reaction tells about the randomness and uncertainty present within the molecule or atoms.Spontaneity of any chemical reaction tells about the ease of completion of that reaction. Gibb's free energy is the total energy involved in that reaction and represented as difference of the enthalpy (of a system) minus the product of the entropy and absolute temperature.Saturated solutions are those solutions in which all solute get completely dissolved, no solute will remain undissolved.Hence correct answers are Enthalpy , Entropy ,Spontaneity, Gibb's free energy and Saturated solutions.
To know more about saturated solutions, visit the below link:
https://brainly.com/question/4529762
If I have 7.0 x 10^24 formula units of magnesium chloride, how many grams of chlorine would I have?
Answers
Answer:
824 g
Explanation:
First we convert 7.0 x 10²⁴ formula units of magnesium chloride (MgCl₂) into moles, using Avogadro's number:
7.0 x 10²⁴ formula units ÷ 6.023x10²³ formula units/mol = 11.62 mol MgCl₂There are two Cl moles per MgCl₂ moles, meaning that we have (2 * 11.62) 23.24 moles of Cl
Finally we convert 23.24 moles of chlorine into grams, using chlorine's molar mass:
23.24 mol * 35.45 g/mol = 824 gWhat is the name of the planet next to the label A?
Solar System
EARTH
SUN
A. Uranus
O ОО
B. Neptune
C. Jupiter
d
D. Saturn
Please help
Answers
Answer:
B. Neptune. Neptune is next to Uranus
5. Vilayanur Ramachandran belleves that in order to understand how our brains work, we need to look at brains that don't work as they should in order to see the differences
and effects that the disconnect of neurons can have on our memories, thoughts, and understanding.
True
O False
Answers
Answer:
true
Explanation:
atoms that have a high electronegativity...
Answers
Helium, bromine, agron, neon,flourine
[tex]\huge \underbrace \mathfrak \red {Question: } [/tex]
❥How can an acid be diluted?
Answers
Explanation:
Acid can be diluted through the distillation process in which acid is reacted with distilled substance like distilled water.
Answer:
an acid be diluted by distillation process.
In exothermic reactions, the system
in energy.
energy, while the surroundings
*
absorbs, increase
absorbs, decrease
releases, increase
releases, decrease
Answers
Answer:
releases, increase
Explanation:
The total energy of products in an Exothermic reaction is less compare to
total energy of the reactants. As a result of these the enthalpy becomes negative, then there is release of heat to the surroundings, which increase the energy of the immediate surroundings inform of heat. Hence the system release energy while the surroundings energy increase.
The limestone used in building the Egyptian pyramids was used because it is _____________
O soft and sticky
O easily melted
O hard and brittle
Answers
Answer:
hard and brittle
hope this helps you ☺️☺️
good night take care sweet dream
The answer is on here already but ya that’s the answer
If 0.1 M solution of CH3COOH of acetic acid will beis 0.01 % ionized in aqueous solution,the ionization constant
a. 10^-7 .
b. 10^-5 .
c. 10^-3 .
d. 10^-9
Answers
Answer:
its answer b
Explanation:
A 15.0 mL solution of Sr(OH)₂ is neutralized with 21.1 mL of 0.350 M HCl. What is the concentration of the original Sr(OH)₂ solution?
Answers
Answer:
0.246 M
Explanation:
The reaction that takes place is:
Sr(OH)₂ + 2HCl → SrCl₂ + 2H₂OFirst we calculate how many HCl moles reacted, using the given volume and concentration:
0.350 M * 21.1 mL = 7.385 mmol HClThen we convert HCl moles into Sr(OH)₂ moles, using the stoichiometric coefficients of the balanced reaction:
7.385 mmol HCl * [tex]\frac{1mmolSr(OH)_2}{2mmolHCl}[/tex] = 3.692 mmol Sr(OH)₂Finally we calculate the concentration of the original Sr(OH)₂ solution:
3.692 mmol Sr(OH)₂ / 15.0 mL = 0.246 MWhich equation represents single replacement reaction? A) CH4 + 2 02 → CO2 + 2 H2O B) CaCO3 + CaO + CO2 C) 2 Na + 2 H2O → 2 NaOH + H2 D) LiOH + HCl → LiCl + H2O
Answers
Answer:
C) 2 Na + 2 H2O → 2 NaOH + H2.
Explanation:
Hello there!
In this case, according to the given chemical reactions, it is possible to firstly understand that a single displacement reaction is characterized by the presence of a single element as the first reactant and a compound as the second one, thus, yielding a compound as the first product and a single element as the second one.
In such a way, according to the given choices, it possible to note that C) 2 Na + 2 H2O → 2 NaOH + H2 is the only one with the aforementioned condition as the element at the reactants side is Na and at the products side is H2.
Best regards!
IM GIVING 100 POINTS FOR WHOEVER ANSWERS THIS PLS HELP determine which heat transfers below are due to the process of conduction. I) You walk barefoot on the hot street and it burns your toes. II) When you get into a car with hot black leather seats in the middle of the summer and your skin starts to get burned when you touch the seats. III) A flame heats the air inside a hot air balloon and the balloon rises. IV) A boy sits to the side of a campfire. He is 10 feet away, but still feels warm. Question 1 options: I & II III & IV I, II, & IV II, III, IV
Answers
Answer:
I and II
Explanation:
Calculate the pOH of this solution. pH = 1.90 pOH =
Answers
Answer:
12.1Explanation:
Since the pH has been given, the pOH can be found by using the formula
pH + pOH = 14
pOH = 14 - pH
From the question we have
pOH = 14 - 1.9
We have the final answer as
12.1Hope this helps you
Answer:
12.10
Explanation:
What's a house hold item that has nuclear energy
Answers
Answer:
Electricity, Weapons, Medicine · Food Treatments, ect.
which formula can be used to calculate the molar mass of ammonia
Answers
Answer:
Since there are 3 Hydrogen atoms present, the formula mass of H is 1.0 × 3 = 3.0 g/mol. Therefore, by adding them up, the formula mass of ammonia is: [14.0 g/mol + 3.0 g/mol] = 17.0 g/mol.
Write a scientific explanation that answers the following question: Is matter conserved during a
chemical reaction in both closed and open systems?
Claim:
Evidence:
Reasoning:
Answers
Answer:
Matter is conserved during all chemical reactions because matter cannot be created or destroyed.
Explanation:
A mixture of water and water vapor is present in a closed vessel at 20 degrees Celsius. the total pressure of the system is 755.0 mmHg. Partial pressure of water vapor at 20 degrees Celsius equals 17.5 mm Hg. What is the partial pressure of H2
Answers
Answer:
737.5 mmHg
Explanation:
Ptotal=PH2O+PH2
P is the pressure and since we have Ptotal and PH2O, we can solve for PH2
755=17.5+x
755-17.5=x
x=737.5
What happens when particles collide in sound waves?
Answers
Answer:
When sound is created, the air particles vibrate and collide with each other, causing the vibrations to pass between air particles. The vibrating particles pass the sound through to a person's ear and vibrate the ear drum. Light travels much faster than sound through air.
Explanation: