Answer:
B
Explanation:
I know im right I forgot some of the lessons cause this was still in grade 3 now Im grade 6....
ARTICLE:
When Olafur Eliasson and Frederik Ottesen heard that more than 1 billion people on Earth don’t have access to electricity, they wanted to help. In many places, lack of electricity means students can’t study after dark and families can’t cook after the sun goes down. It’s also harder for doctors and nurses to treat patients without good lighting. Eliasson and Ottesen decided to invent a solar lamp that would provide light without costing a lot of money, polluting the air, or causing fires.
Their solution? The Little Sun lamp is a sun-shaped light with a light bulb on one side and a solar panel on the other. The Little Sun lamp uses energy to provide light to people who need it, but the Little Sun doesn’t make its own energy. To run, the lamp needs to get energy from somewhere else. In this case, that source of energy is the sun. The solar panel on the back of the lamp converts light energy from the sun into potential energy that can be stored in a battery and used later to make the light bulb shine. Little Sun lamps charge in the sun during the day and provide light at night, allowing people to study, cook, work, and take care of other things even after the sun sets. They’re inexpensive, don’t pollute, and don’t cause fires.
questions: 2) How does the Little Sun Lamp help people around the world get light?
3) How does the Little Sun Lamp use energy from the sun to make the light bulb shine?
Answer:
got light to charge from the sun
Explanation:
they did it so that people don't pollute the ozone layer and thats why they invent that and it help them in every way
Write the equation that represents what happens when barium hydroxide dissolves in water. You do not need to include water as a reactant in the equation.
Barium hydroxide dissolves in water according to the equation: [tex]Ba (OH)_2 (aq) ---> Ba^2^+(aq) + 2OH^-(aq)[/tex]
When barium hydroxide is dissolved in water, it dissociates into its component ions completely. In other words, barium hydroxide dissociates into barium and hydroxyl ions just like every other strong base.
The equation for the dissociation in water is as follows:
[tex]Ba (OH)_2 (aq) ---> Ba^2^+(aq) + 2OH^-(aq)[/tex]
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Answer:
Ba(OH)2 (s) --> Ba2+ (aq) + 2OH- (aq)
Explanation:
Barium hydroxide is a solid before it dissolves in water, and then becomes an aqueous solution during the reaction.
A unit for measuring work is called the _____.
horsepower
effort
time
foot-pound
Answer:
A unit for measuring work is called the foot-pound
A balloon contains 0.76 mol O2, 0.18 mol Ne, 0.031 mol Xe and 0.026 mol CO2 at 749 mm Hg. What is the partial pressure of Ne
Answer:
ans given below
Explanation:
To keep simplicity, let's assume these gases behave ideally so we can use the equations for ideal gas. One of these equation is the Raoult's Law written below.
P* = xP
This is another form of the Raoult's Law where x is the mole fraction. Let's find x for O2.
x = 0.18/(0.76+0.18+0.031+0.026) = 0.1805
Partial Pressure = (0.1805)(749 mmHg) = 135.23 mmHg
what are the products of the reaction: Be(s)+ Cl2(g)⟶
Answer:
BeCl2
Explanation:
Be+Cl2=BeCl2
The reaction is: Fe2O3 (s) + 2Al (s) → 2Fe (l) + Al2O3 (s)
What mass, in grams, of iron (III) oxide reacted to produce 4.5 mol of Al2O3 ???
Answer:
718.6 gm
Explanation:
The reaction is: Fe2O3 (s) + 2Al (s) → 2Fe (l) + Al2O3 (s)
What mass, in grams, of iron (III) oxide reacted to produce 4.5 mol of Al2O3
1 mole of Fe2Os produces 1 mol of Al2O3
so 4.5 mols Fe2O3 would produce 4.5 mols Al2O3
the molecular mass of Fe2O3 is
(2 X 55.85) + (16 X 3) =
111.7 + 48 =
159.7
4.5 mols Fe2O6 weighs
4.5 X 159.7 =
718.6 gm
check:
718.6 gm of Fe3O2
which of the following substances will cross the cell membrance through osomosis
Answer:Water, carbon dioxide, and oxygen are among the few simple molecules that can cross the cell membrane by diffusion (or a type of diffusion known as osmosis ).
Explanation:
You are given a water-soluble compound X. Describe how you would determine whether it is an electrolyte or a nonelectrolyte. If it is an electrolyte, how would you determine whether it is strong or weak?
If the compound contains a metal cation or an ammonium cation, then the compound is ionic. Otherwise it is a molecular compound. Ionic compounds that dissociate completely in water are strong electrolytes. ... Molecular compounds that are weak acids are weak electrolytes.
CORRECT ME IF IM WRONG
HOPE IT HELPS:(
An electrolyte substances which, when dissolved in aqueous solution, dissociates into cations (+ ions) and anions (- ions).
Electrolytes can either be a weak or strong electrolyte depending on whether they can dissociate partially or completely.
Therefore, regarding the water-soluble compound X:
it is an electrolyte if it dissociates into its respective ions in an aqueous solutionThe compound is a weak or strong electrolyte depending on whether it dissociates partially or completely.Learn more about electrolytes at: https://brainly.com/question/14566383
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Compuesto organico que no existe como alqueno ni alquino?
Answer:
Susssssssssssssssy
Explanation:
Sup
Which of the following statements are TRUE for BOTH oxygen and sulfur atoms?
a. contain the same number of valence electrons on their outermost shell
b. have the same number of complete shells
c. atomic sizes are nearly the same
d. they are able to form sigma and pi bonds
e. their-2 change anion is isolemectronic to neon
Answer:
b. have the same kind number of complete shells
What are the causes and consequences of climate change
Answer: Humans are increasingly influencing the climate and the earth's temperature by burning fossil fuels, cutting down forests and farming livestock.
Explanation: This adds enormous amounts of greenhouse gases to those naturally occurring in the atmosphere, increasing the greenhouse effect and global warming.
What happens to the pH of a solution is the concentration of hydronium ions decrease
Why are coal, oil and natural gas called fossil fuels
in metallurgy hydrogen reduce metal oxides to
Answer:
Considering the above series we can say that hydrogen can reduce only oxides of copper, mercury, silver and gold as these metals are less reactive than hydrogen.
1. Assume samples that emit radiation are placed on a table across the room. Which sample will produce the greatest damage to you? Alpha emitter Beta emitter? Gamma emitter? WHY?
The damage caused by the radiations has been maximum for the gamma radiations.
What are charged radiations?The charged radiations are comprised of the molecules that have been comprised of the charged particles. The charged particles have been alpha, beta or gamma radiation.
The damage that has been caused by the radiation has been found with the intensity of the quality factor and the thickness of the molecule that comprises the amount of damage formed.
The maximum quality factor has been for the gamma radiation. Thus, gamma radiations form the basis for the maximum damage.
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can someone please help me i need this done rn
What happened a when you try to layer a more-dense solution on top of a less-dense solution
Answer:
the more dense solution will sink to the bottom the less dense solution will go to the top
Answer:
Explanation:The density of a liquid determines whether it will float on or sink in another liquid. A liquid will float if it is less dense than the liquid it is placed in. A liquid will sink if it is more dense than the liquid it is placed in.
Density of a liquid determines how it will layer (heaviest to lightest). If the liquid us least dense it float to the bottom. Layers will remain separated because each liquid is actually floating on top of the more dense liquid beneath it.
The small flag indicating wind direction on a station weather plot points in the direction that the wind is going.
True or False
Answer:
False
Explanation: The wind's direction is shown by a long shaft. it will point to the direction from which direction the wind is blowing.
Read the etymology entry.
antagonize
antagonize (v.) 1630s, "to compete with" (obsolete); 1742, "act in opposition to, struggle against continuously,"
from Greek antagonizesthai "to struggle against, oppose, be a rival," from anti "against" (see anti-) + agonizesthai
"to contend for a prize," from agon "a struggle, a contest" (see agony). Meaning "make antagonistic" is by 1882.
What original language did the word antagonize come from?
O Greek
O Latin
O Middle French
O Middle English
Answer:
latin
Explanation:
im not sure sorry if wrong
Answer:
Greek
Explanation:
Mid 17th century (in the sense 'compete with'): from Greek antagōnizesthai, from ant- 'against' + agōnizesthai 'struggle' (see agonize).
Please help I’m so lost!! Chemistry
Answer:
i will help you
Explanation:
if the reactions have more energy than the products this means that there is some energy that given outside and this reaction will called an exothermic reaction.
But if the reaction have less energy than the products this means that there is some energy that taken from outside and this reaction is called an endothermic reaction.
. Why do we experience night and day? A. The moon blocks out the Sun during the night. B. The moon blocks sunlight from getting to one side of Earth. C.The side of Earth facing the Sun receives the sunlight. D.the side of Earth facing the Sun does not receive sunlight.
Hello Darling, it's because (C) The side of the Earth facing the Sun receives sunlight.
Hope this help~ ^^
Answer: C
The side facing the Sun receives the sunlight. The side that doesn’t face the sun downs’t recieve sunlight. The side that receives the sunlight experiences day, and the side that doesn’t receive sunlight experiences night.
:)
Aanlyze the potential energy diagram of the
reaction shown.
Which statements about the reaction are true?
Select all that apply.
The reaction is exothermic
The reaction is endothermic
The equation shows that 891 kJ of energy are
released as a product.
The equation shows that 891 kJ of energy are
absorbed as a reactant.
The graph shows that the reactants have greater potential energy than the products.
The answer is a,c,e
Answer:
A: The reaction is exothermic
C: The equation shows that 891 kJ of energy are released as a product.
E: The graph shows that the reactants have greater potential energy than the products.
Explanation:
The statement about the reaction is true:
A: The reaction is exothermic
C: The equation shows that 891 kJ of energy is released as a product.
E: The graph shows that the reactants have greater potential energy than the products.
What is potential energy?Potential energy is the energy that is saved in the body. It is used in the work and when convert into kinetic energy.
A moving item fundamentally possesses kinetic energy. Kinetic energy would therefore be created as a result of an object moving or an elastic band being released since the released object exhibits motion.
Therefore, the correct option is A: The reaction is exothermic, C: The equation shows that 891 kJ of energy is released as a product, and E: The graph shows that the reactants have greater potential energy than the products.
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how many atoms of zinc are required to weigh 5.4 ng
Answer:
4.97 X 10^13 ATOMS OF Zn
Explanation:
how many atoms of zinc are required to weigh 5.4 ng
a nano gram is 10^-9 grams
Zinc has an atomic mass of 65.39 gm/moles
there is an Avogadros number of atoms in a mole
65.39 GRAMS PER MOLE
65.39 g/(6.022 X 10^23)how many atoms of zinc are required to weigh 5.4 ng
GRAMS PER ATOM
1.086 GRAMS PER 1O^22 ATOMS
1 atom of Zn weighs 1.086 X 10^9 X 1O^-22 n grm=
1,086 X 10^-13 n gm
Y tines 1.086 X 10^-13 = 5.4 n gm
Y = 5.4/ (1.086 X 10^-13) =
4.97 X 10^13 ATOMS OF Zn
CHECK
(4.97 X 10^13 ) X 65.39 gm/(6.022 X 10^23) =
5.397 X 10^-9 =
5.4 n g
What type of energy is best described as the energy required to break the bonds present in the reactants?
A
activation energy
B
potential energy
С
kinetic energy
D
thermal energy
hay
Answer:
b
Explanation:
Haty
The energy required to break the bond in the reactants is activation energy .
Hence, option (A) is correct answer.
What is Exothermic Reaction ?The chemical reaction which releases energy are known as exothermic reaction. Bond forming is exothermic process. Activation energy is needed to initiate the reaction. In exothermic reaction potential energy converted into kinetic energy.
What is Endothermic Reaction ?The chemical reaction which absorbs heat from the surrounding is known as endothermic reaction. Bond breaking is endothermic reaction. Activation energy is needed to initiate the reaction. In endothermic reaction kinetic energy converted into potential energy.
Thus, from the above conclusion we can say that The energy required to break the bond in the reactants is activation energy .
Hence, option (A) is correct answer.
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An element with 3 valence electrons would be a
0-3 anion
0 + 3 anion
+3 cation
0 - 3 cation
Answer:
0+3 anion
Explanation:
Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that, through cellular respiration, can later be released to fuel the organism's activities.
Pls answer.............
Answer:
Ductile
Explanation:
The metal is ductile, and that is why it can be stretched into wires.
How many moles of the excess reagent would there be if 2.8mol of N2 were reacted with 15.1mol of H2O?
N2+4H2O ---> 2H2O2+N2H4
The number of moles of the excess reagent there would be is 3.9 moles
From the question,
We are to determine the number of moles of the excess reagent there would be.
The given balanced chemical equation is
N₂ + 4H₂O → 2H₂O₂ + N₂H₄
This means,
1 mole of N₂ is required to react completely with 4 moles of H₂O
Now,
If 1 mole of N₂ is required to react completely with 4 moles of H₂O
Then,
2.8 moles of N₂ will react completely with 11.2 moles of H₂O
∴ H₂O is the excess reagent
Number of moles of H₂O that would remain = 15.1 mol - 11.2 mol
Number of moles of H₂O that would remain = 3.9 mol
Hence, the number of moles of the excess reagent there would be is 3.9 moles
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What is the answer to this question
Answer:
(i) of protons
(ii) total number of both protons and neutrons
(b)they are neutral or have no overall charge because there are equal numbers of negative electrons to positive protons
Explanation:
Since both charges are equal, the number of positive protons cancels the number of negative electrons, thereby making the atom neutral
Which of the following corresponds to an alpha particle?
A. 1/4He
B. 3/2He
C. 2/2H
D. 4/2He
Answer:
D. 4/2 He corresponds to an alpha particle.
The electron configuration of an element is shown below.
1s22s22p63s23p6
Name the group this element belongs to in the periodic table and explain your answer.
Based on the electron configuration, write one chemical property of this element.
The element belongs to group 18 and the element is chemically inert.
What is electron configuration?The term electron configuration refers to the arrangement of electrons in an atom. The electron configuration of an atom can show the group to which it belongs in the periodic table.
Given the configuration, 1s22s22p63s23p6 the element belongs to group 18 and the element is chemically inert.
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