Answer:
I think its C
Explanation:
because it travels from the sun to earth
A student adds different amounts of ice to four samples of water and records the change in temperature after 30 minutes. What is the independent variable in this investigation?
Answer:
Amount of ice
Explanation:
When we talk about independent variable, we mean that variable in an experiment that is manipulated and its effect on the dependent variable is measured.
In this case, the amount of ice in each water sample determines the temperature of each sample. Hence the amount of ice is the independent variable.
Answer:
ice cubes added
Explanation:
The particles are in a fixed position. What state of matter is this?
Answer:
The state of matter is solid
Explanation:
Which lists the waves in order of wavelength, from longest to shortest?
A) X-rays, infrared, radio waves
B) infrared, visible light, gamma rays
C) ultraviolet, microwaves, visible light
D) radio waves, gamma rays, visible light
Answer:
B
Explanation:
gamma rays have the shortest wave length
Infrared, visible light and gamma rays are lists of the waves in order of wavelength, from longest to shortest. Hence, option B is correct.
What is wavelength?Wavelength is the distance between identical points (adjacent crests) in the adjacent cycles of a waveform signal propagated in space or along a wire.
The electromagnetic spectrum includes, from longest wavelength to shortest: radio waves, microwaves, infrared, optical, ultraviolet, X-rays, and gamma-rays.
Hence, option B is correct.
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list down some examples of solutions that we need to prepare/make in the form of unsaturated and saturated solution
Answer:
1)Carbonated water is saturated with carbon, hence it gives off carbon through bubbles.
2)Adding sugar to water until it no longer dissolves creates a saturated solution.
3)Continuing to dissolve salt in water until it will no longer dissolve creates a saturated solution.
An unsaturated tea and sugar solution would be one into which you could add more sugar and have the sugar still dissolve
describes the
unbalanced attractive force
toward the interior of the liquid
that molecules experience at the
air-liquid interface.
A. Vapor pressure
B. Surface tension
D. Condensation
C. Boiling point
Answer: B. Surface Tension
Explanation:
It is the tension of the surface film of a liquid caused by the attraction of the particles in the surface layer by the bulk of the liquid, which tends to minimize surface area.
Calculate the molarity of a solution prepared by dissolving 2.50 mol of KCl into 2.00 L of solution.
________ M
Answer:
1.25 M
Explanation:
The molarity is found dividing the moles of solute by the litres of solution.
2.50 mol ÷ 2 L = 1.25 M
The concentration terms are molality, normality and mole fraction. Molarity can be used to find out the ionic strength of any solution. Therefore, the molarity of a solution prepared by dissolving 2.50mol of KCl into 2.00 L of solution is 1.25 M.
What is molarity?Molarity can be calculated by dividing number of moles of solute by volume of solution in liter. Molarity is affected by temperature. Its unit is mole/liter. It measure the concentration of any solute in a solution.
Mathematically,
Molarity= number of moles of solute/volume of solution in liter
number of moles of solute KCl= 2.50 mol
volume of solution in litre = 2.00 L
substituting all the given values in the above equation, we get
Molarity= 2.50 mol ÷ 2 L
Molarity = 1.25 M
Therefore, the molarity of a solution prepared by dissolving 2.50mol of KCl into 2.00 L of solution is 1.25 M.
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Which substance is the precipitate?
Answer:
In chemistry, a precipitate is an insoluble solid that emerges from a liquid solution. The emergence of the insoluble solid from solution is called precipitation. Often the precipitate emerges as a suspension. Precipitates can form when two soluble salts react in solution to form one or more insoluble products.
Explanation: Hope this helps! :>
What unit is mass generally measured in
Answer:
kilograms
Explanation:
hope this helps, pls mark brainliest :D
Answer:kilogram
Explanation:
I got the smarts
how is mechanical energy related to potential and kinetic energy
Answer:
Mechanical energy is the energy that is possessed by an object due to its motion or due to its position. Mechanical energy can be either kinetic energy (energy of motion) or potential energy (stored energy of position). A moving car possesses mechanical energy due to its motion (kinetic energy).
Explanation:
NEED HELP?!! Whats the answer
NEED HELP!!!
Which word best describes a form of energy associated with molecules in motion and heat?
Thermal energy
Kinetic energy
Vaporization
Condensation
4. Anh measured the temperature of a pond near his house. Before he left for school, the water in the
pond was 18°C. When he came home from school, the temperature of the pond was higher than it
was in the morning. What happened to the water molecules while he was at school?
The water molecules must have gained more thermal energy while Anh was away from the house.
An increase in the temperature of a body means that the body has gained more energy in the form of heat, also known as thermal energy.
The thermal energy represents the characteristic of a body responsible for its temperature.
An increase in the temperature of the water molecules increases their kinetic energy and, thus, makes the water molecules move around faster than before.
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what are the coefficients that will balance the skeleton equation
Answer:
When the following equation is balanced, what is the coefficient for HCl? Mg(s) + HCl(aq) -> MgCl2(aq) + H2(g) . 2. What are the coefficients that will balance the skeleton equation below? AlCl3 + NaOH -> Al(OH)3 + NaCl.
Which of the following is an example of an exothermic reaction?
A. Thermal decomposition
B. Ammonium nitrate and water C. Photosynthesis
D. Respiration
Exothermic reactions release heat when the reactants produce products. The process of respiration is an exothermic reaction as it releases heat. Thus, option D is correct.
What is an exothermic reaction?An exothermic is a type of reaction that involves the release of heat during the reaction through product formation. The respiration reaction is exothermic as it involves the breakdown of oxygen and glucose into energy.
Thermal decomposition is an endothermic reaction as it requires energy for completion. Similarly, photosynthesis and reaction between ammonium nitrate and water are endothermic reactions as they also require energy from the external source.
Therefore, respiration is an exothermic reaction.
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when the white part is on the left the moon is.??
Answer:
Last Quarter also called Third Quarter.
Explanation:
can someone explain this to me?
Answer:it says how to make an atom stable like ion if the atom is metal then it will lose the atom to be full outer shell and if it is non metal it will gain.
second thing there is also covalent bond which share electron with other atomto be full outer shell
hope this help!!
Identify each type of reaction shown below:
Answer:
See explanation
Explanation:
1. Decomposition= when one compound or substance is separated into 2 elements.
2. Single displacement: b is switched with c
3. double displacement: when 2 reactants form 2 different products
A base used in baking cake is
Answer:
sodium bicarbonate, potassium bicarbonate and ammonium bicarbonate are the most commonly used bases.
An element has atomic number 10 and an atomic mass of 20. How many neutrons are in the atom of this element?
OA.
10
OB.
20
O C.
30
D. 0
O E. 200
10
subtract the atomic mass from the atomic number
Guys please help me
What happens when the number of electrons and protons inside of or atenie equel?
Answer:
When the number of electrons does not equal the number of protons, the atom is ionized and then they are no longer atoms, they are known as ion(s).
Why are the transition metals able to show different properties like varying color and paramagnetism ?
Answer:
Colors of transition metal compounds are due to two types of electronic transitions. Due to the presence of unpaired d electrons, transition metals can form paramagnetic compounds. Transition metals are conductors of electricity, possess high density and high melting and boiling points.
Explanation:
The transition metals are able to show different properties like varying color and paramagnetism due to presence of unpaired d-electrons.
What are transition metals?The transition metals are defined as the elements in which atoms are present whose d-sub-shell is partially filled .Due to which they give rise to cations with an incomplete d-sub-shell.
They are also defined as the elements which are present in the d-block of the periodic table, which includes groups from three to twelve.These elements are called transition elements as they show a transition between highly electro-positive group 1 and highly electro-negative group 17 elements.
They have characteristic properties due to which they can exist in variable oxidation states , form colored complexes and have catalytic properties as well.These elements are all technologically very important.
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Question 2
Name the following compound:
N_Bro
O Tetranitrogen Nonabromide
O Quadranitrogen Nonabromide
O Nitrogen Bromide
Answer:
Tetranitrogen Nanobromide
is 2Sb+3L2-> 2SbL3 endothermic or exothermic?
Answer:
try working out the bond enthalpies for both sides of the equation :)
Explanation:
Which of the following would increase the intensity of the tornado?
a. decrease in wind speed
b. decrease in condensation
c. increased rate of evaporation
d. increase of cold air
Answer:
c. increased rate of evaporation
Explanation: Tornado strength is affected by many factors including wind speed, size, where the tornado forms geographically, and duration of the tornado. Additionally, conditions for a supercell storm usually intensify the strength of tornadoes such as humidity, atmospheric instability, lift, and vertical wind shear.
What are Oxygens important uses (and why)?
Answer:
Common uses of oxygen include production of steel, plastics and textiles, brazing, welding and cutting of steels and other metals, rocket propellant, oxygen therapy, and life support systems in aircraft, submarines, spaceflight and diving.
Explanation:
Oxygen is used to degrade hydrocarbon compounds, which are broken apart by heating them. This is used to create combustion that usually liberates water and carbon dioxide, but can also produce the hydrocarbons acetylene, propylene and ethylene. Oxygen is used in sewage-treatment and water-purification plants.
(HELP FAST)Which of the following always changes when a substance undergoes a
chemical change?
) Calculate the Gibbs energy change for the formation of propane at 298K.Given that ∆H for propane is -103.85KJ/mol.∆S for the reaction is - 269.74KJ/mol.
Answer:
ΔG = 80,278.67 J/mol
Explanation:
Given:
∆H = - 103.85KJ/mol
∆S = - 269.74KJ/mol
T= 298 K
The Gibbs energy change (ΔG) is calculated as follows:
ΔG = ΔH - TΔS
ΔG = (-103.85KJ/mol)-298K(- 269.74KJ/mol)
ΔG = (-103.85KJ/mol) - (-80,382.52 J/mol)
ΔG = 80,278.67 J/mol
Write a short note on LAN? Also write down its advantages and disadvantages of LAN?
I NEED THESE ASAP PLEASE!!!! I WILL MARK A BRAINLIEST...
Magnesium and Chlorine are chemically bonded. Which type of bond holds them
together?
ionic
covalent
neither
Answer:
The answer should be Ionic
Explanation:
prove me wrong
Help? i need to finish my assignment :>
Answer:
B 2
Explanation:
I checked it and it’s right hope this helps!!