Answer:
If there's a grass area in the shape of a square and one side is 8 metres how much would it cost to fill the grass with fresh gravel at $5/metre
Why are scientists now more excited about sound levitation than they had been previously?
SELECT AN ANSWER
Sound levitation was previously only a theory and has only now been done experimentally.
By using sound levitation at the right frequency, scientists can break objects like glass.
The cost of sound levitation has decreased dramatically over the past decade.
Research has shown scientists can control the movement of liquids with sound without touching the liquid
Answer:
Acoustic tractor beams use the power of sound to hold particles in mid-air, and unlike magnetic levitation, they can grab most solids or liquids even small insects. For the first time engineers have shown it is possible to stably trap objects larger than the wavelength of sound in an acoustic tractor beam. This discovery could enable the manipulation of drug capsules or micro-surgical implements within the body. The discovery could even lead to levitating humans.
Explanation:
Pleaseeeee answer quick
The most reactive metals are located in wwhich area of the periodic table?
A.top
B.far left
C.far right
D.center
Answer:
B
Explanation: Lithium, sodium, and potassium, etc. all react with water
According to the rock cycle, which of the following transitions are possible? Assume an unlimited number of steps.
A. )An intrusive igneous rock becomes a sedimentary rock.
B. )A sedimentary rock becomes soil.
C. )A metamorphic rock becomes an extrusive igneous rock.
D. )All of the above are possible.
Answer:
The answer is D
Explanation:
All of these solutions are correct.
Answer:
d
Explanation:
edge
How cations can become neutral atoms?
Answer:
By gaining elections
Explanation:
Cations are formed when neutral atoms loss electrons and when they gain back the lost electrons the charges are neutralized.
Eg. Cu=Cu2+ + 2é
Cu2+ + 2é=Cu
Think about atoms, molecules, elements, and compounds. How can you relate it to your own body? To the world around you, right now? Please explain in four sentences.
Answer:
Everything we see comes from the transferring of electrons, or redox reactions. Fire, the screen you are staring at, and many other chemical reactions that happen everyday, we don't even care to notice anymore. Everything in our bodies is made up of compounds, from simple things such as H2O, and to the food we eat, loaded with sugar, C12H22O11. From the para-benzoic acid on your sunscreen, to the O3 in the ozone layer high above us.
Explanation:
Fill in the word that correctly completes this sentence.
A pure substance is a single kind of matter. (Word you fill in)
is made up of two or more substances that are together in the same place, but each substance keeps its own properties.
10g of an oxide of copper contains 8.882g of copper. what is empirical formula of the copper oxide
Answer:
Mass of copper oxide: 10g
Mass of copper: 8.882g
Mass of oxygen: 1.118g
Cu O
8.882 1.118
Divide by [tex]A_{r}[/tex] 8.882÷63.5 1.118÷16
0.14 0.07
Divide by the lowest number 0.14/0.07 0.07/0.07
2 1
Check the ratio now, Cu has 2 atoms and O has 1 atom .
The formula is [tex]Cu_{2} O[/tex]
Hypothesis: Which materials do you think will meet the special needs of Parvus' house? Use the drop-down selections to create your hypotheses. Be sure to record your hypotheses on your lab report. If we use Select to build the roof of the house, then the temperature inside the house will remain cooler. If we use Select to build the walls and floors of the house, then the temperature inside the house will remain cooler. If we use Select to bring electricity into the home, then it will allow electricity to flow into the home at a faster rate. If we use Select to construct the latches on the windows and doors, then the magnetism will keep the latches secure.
Answer:
This question is incomplete as it lacks the options for each hypothetical statement. The options for each hypothesis are:
wood, clay brick, iron, aluminum, copper, or nickel
The answers to each hypothesis are:
1. Wood
2. Clay brick
3. Copper
4. Iron
Explanation:
Firstly, a hypothesis is a testable explanation given to explain an observed problem or to answer a question. In this case, "which materials will meet the special needs of Parvus' house?" is the question.
The question requires one to complete the given hypotheses using the options given.
- If we use WOOD to build the roof of the house, then the temperature inside the house will remain cooler. The best answer is "wood" because wood conducts/absorbs heat the least among the materials that can be used for roofing, hence, it will make the inside of the house cooler.
- If we use CLAY BRICK to build the walls and floors of the house, then the temperature inside the house will remain cooler. Clay brick is the best material for building walls and floors of a house among the option. Also, it conducts heat fairly making the interior of the house cool.
- If we use COPPER to bring electricity into the home, then it will allow electricity to flow into the home at a faster rate. Copper, among all other metal, is the best conductor of electricity due to its properties including low resistivity. Hence, using copper will make electricity to flow into the home at a faster rate.
- If we use IRON to construct the latches on the windows and doors, then the magnetism will keep the latches secure. Iron is the metal with the best magnetic property. Therefore, using it to construct the latches on the windows and doors will guarantee magnetic security.
before they react and form chemical compounds with other atoms ALL atoms are electrically neutral
A. True
B. False
Answer: true
Explanation:
Which of the following substances has the highest melting point?
a. pentane b. nonane c. ethane d. butane
Nonane (b) has the highest melting point.
-----------------------------
A caveat: I'm assuming that we're dealing with the straight-chain isomers of these alkanes (specifically pentane and nonane). The straight-chain isomer of pentane (n-pentane, CH3-[CH2]3-CH3) has a melting point of -129.8 °C; the straight-chain isomer of nonane (n-nonane, CH3-[CH2]7-CH3) has a melting point of -53.5 °C. The pattern holds as you go down (or up): The more carbon atoms, the higher the melting point. So, in decreasing order of melting points here, you'd have the following: nonane > pentane > butane > ethane.
However, one structural isomer of pentane, neopentane, has a melting point of -16.4 °C, which is higher that the melting point of n-nonane despite neopentane having the same molecular formula as its straight-chain isomer. Of course, you're not to blame for coming up with this question; this is just some extra info to keep in mind.
the electrons used in bonding are known as
a. bonding electrons
b. proton
c. neutron
d.moron
Answer:
bonding electron
Explanation:
because they will bond together.
How many significant figure are in the number 0.000850320
Answer:
6
Explanation:
the sig figs are 850320
25 Points Please Help ASAP!! View Attached Image!! Will Mark Brainliest If All Are Answered!!
Answer:
Answers in explanation.
Explanation:
30. A (A chemical changes changes the chemical properties)
31. C (rusting is an example of a chemical change
32. B (A reaction requires energy, so some energy will be expelled)
33. B (Color change is an example of a chemical change)
34. A (The law of the conservation of mass: Mass and Energy cannot be created nor destroyed)
NEED HELP HURRY!
Select the correct answer.
Which item is made from a synthetic material?
OA
cotton pants
B.
leather jacket
O C.
tissue paper
D.
wicker basket
Answer:
B: Leather Jacket
Explanation: I hope that this helped :)
8. Carbohydrates on cell membranes help cells
A digest food
C store cellular information
B keep'water out of the cell
D. recognize each another
Answer:
A
Explanation:
What particle is in the nucleus that gives it a positive charge?
Answer:
proton
Explanation:
"Proton: A positively charged particle found in the nucleus of an atom. A proton contributes one atomic mass unit to the total atomic weight of an atom" this is definition per Google search
Protons with different number of nuetrons are called?
Answer:
Atoms of a particular element must have the same number of protons but can have different numbers of neutrons. When an element has different variants that, while all having the same number of protons, have differing numbers of neutrons, these variants are called isotopes.
hope this helps
The decay of radium-226 produces an isotope
of the element radon and alpha radiation. The
atomic number of radium (Ra) is 88; the atomic
number of radon (Rn) is 86. Write a balanced
equation for this transformation.
Answer:
²²⁶₈₈Ra → ²²²₈₆Rn + ⁴₂He +⁰₀γ
Explanation:
This radioactive decay occurs when the unstable radium-226 atom wants to lose energy by emitting an alpha particle from its nucleus which is an helium nucleus with no electron. The radium (86) is transformed to radon(Rn) where the atomic number of radium (88) is reduced by two units into radon, Rn (86) and mass number reduced by 4 units.
The equation for the transformation is;
²²⁶₈₈Ra → ²²²₈₆Rn + ⁴₂He +⁰₀γ where
²²⁶₈₈Ra ---------radium-226
²²²₈₆Rn -------radon-222
⁴₂He ----------alpha particle
⁰₀γ ------------energy
Note that ⁴₂He can also be written as : ⁴₂∝
Answer:
it is alpha decay
Explanation:
im albert einstien
Elements that are good conductors, malleable, ductile, and shiny
ductility
malleability
metal
metalloid
nonmetal
Metals are ductile,malleable,good conductors and shiny
What are 2 mixtures and explain your answer
Air
Orange juice
Silver
Sodium chloride
Water
If a 2 kg object produces a 16 N force, what is its acceleration?
Answer:
f=ma
so a=f/m
a=16N/2kg
a=8m/[tex]s^{2}[/tex]
Base your answers to questions on the food web below and on your knowledge of science. Answer each part below. A. Which organism labeled in this food web provides energy, either directly or indirectly, to all of the other organisms? Explain why this is your answer. B. Explain why the amount of food available to the slug population might increase if the aphid population decreased.
Answer A:
The organism which provides energy directly and/or indirectly to all of the other organisms is the garden plants.
Explanation:
Plants are generally found at the lowest part of the pyramid/food chain. They are also called Autorotrophs because they are the primary producers of energy from which the entire pyramid feeds off.
The other animals/organisms on the pyramid are called Heterotrophs because they depend directly or indirectly on the primary energy producers.
Answer B:
The Slug and the Aphid feed are herbivorous. So they are in competition for the garden plants. If one of them, for some reason, decreased in population, the other will have more food to eat.
Cheers
Which event represents a chemical change? A. breaking glass B. chopping wood C. crushing a can D. milk turning sour
Answer:
D
Explanation:
hi! a chemical change changes the composition of the material. in A, even though the glass is broken, it is still glass. for B, even though the wood is chopped, it is still wood. for C, even though the can is crushed, it is still a can. D is a chemical change because the milk's taste changes, meaning its chemical composition changed and a reaction occurred. it is no longer the original milk.
The event represents a chemical change is milk turning sour. Hence option D is correct.
What is chemical change?Chemical change is defined as a transformation of one material into another, the formation of new materials with distinct properties, and the creation of one or more new substances. Chemical synthesis, or, alternatively, chemical breakdown into two or more separate molecules, occurs when one material reacts with another to create a new substance.
In the case of milk, it contains a sugar called lactose as well as lactobacillus, a type of bacteria that is completely safe and uses the lactose to produce energy and lactic acid. This is what gives milk its sour flavor. When the taste of the milk changes, a chemical reaction has taken place, changing its chemical makeup. It isn't the original milk anymore.
Thus, the event represents a chemical change is milk turning sour. Hence option D is correct.
To learn more about chemical change, refer to the link below:
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5.00 C =? K
A.) 306 K
B.) 278 K
C.) 273 K
Helpppp, this is due at 12:00 am !!!!
Answer:
The individual substances in a mixture can be separated using different methods, depending on the type of mixture. These methods include filtration, evaporation, distillation and chromatography.
Explanation:
Which of these particles is the smallest?
A.a proton
B.a nucleus
C.an electron
D.an atom
Answer:
an atom. It is the smallest thing known to man kind
Explanation:
Answer:
C
Explanation:
so basically, we can eliminate some answer choices right away.
an atom (answer choice D) is made up of all the other answer choices, so that is the largest (not the answer).
a nucleus (answer choice B) is made up of protons (answer choice A) and neutrons which means it is not the smallest either (not the answer).
now, we are left with a proton and an electron. electrons are much smaller than protons, so they are usually not included in an element's atomic mass. therefore, an electron is the smallest out of these answer choices.
What do you call all the water on Earth's surface?
Answer: The hydrosphere includes all of the water which is on the surface of the planet. A planet's hydrosphere can be vapor, ice, or liquid.
Answer:
hydrosphere
Explanation:
Which property refers to how light reflects off of a mineral?
A. fracture
B. cleavage
C. streak
D. luster
Answer:
D. Luster
Explanation:
Luster describes how a mineral reflects off light. It is in the definition.
Chloroplasts and mitochondria are both involved in energy conversion in cells.Select the other similarities they share. Choose ALL
that apply
Answer: The Answer is A,B And E
Explanation:
The similarities between mitochondria and chloroplast in plants include, they both contains DNA and ribosomes and both are surrounded by double membranes.
What is mitochondria?Mitochondria is an organelle found in cells of plants and animals. It is know as the power source of cell since it delivers the chemical energy for cell. Chloroplasts are special organelles found in plants. They contains thylakoids which are used in photosynthesis. Chloroplasts are not found in animal cells.
Both mitochondria and chloroplast are surrounded by an inner membrane and outer membrane. They contains their own DNA inside. Both are involved in energy conversion but the mechanism differs.
Both chloroplast and mitochondria contains ribosomes. Hence, options A, B and E are correct.
To find more on mitochondria, refer here:
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How many electrons does chlorine need to obtain a full outer energy level of electrons? A) 1 B) 2 C) 3 D) 4
You just need one to reach full energy. (A)
Only one electrons does chlorine need to obtain a full outer energy level of electrons. Thus, option A is correct.
What is an electron?An electron is defined as a subatomic particle which is charged negatively either bounded to an atom or not it means free. The nucleus of an atom is made up of electron, proton and neutron. The electron is a basic particle and electron is not made of anything.
The nature of electron is free it means they are present freely in nature and consist of an atom.The main function of electron is that they play the role of negatively- charged component of an atom.
The electrons are primary source of current conducting and electrons number as well as atomic number of an element is always same or equal. There is no size of electron but the mass of electron is 9×10^-31.
Learn more about electron here:
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