Answer: Microscope
Robert Hooke's Microscope. Robert Hook refined the design of the compound microscope around 1665 and published a book titled Micrographia which illustrated his findings using the instrument.
Explanation:
Answer:
Hey i actually know this! haha only cause i did it.
its a Microscope.
and im pretty sure hooke was the first to discover!
Explanation:
brainliest?
7. Cecilia puts two magnetic toy trains very close to each other on a track. What will happen next, and
why.
0.14g of methanol is burnt and 3.04kJ of heat is released. Calculate the enthalpy of combustion of methanol.
Answer:
-694.8 kJ/mol ≅ -695 kJ
Explanation:
The enthalpy of combustion (ΔHc) is defined as the amount of heat that is released when 1 mol of the compound is burned. We have the mass of methanol (0.14 g) and we have to calculate the moles present in that mass. For that, we need the molecular weight of methanol, which is calculated from the molar mass of the chemical elements.
Methanol: CH₃OH
Mw(CH₃OH) = (12 g/mol x 1 C) + (1 g/mol x 3 H) + 16 g/mol O + 1 g/mol H = 32 g/mol
moles of CH₃OH = mass/Mw(CH₃OH) = 0.14 g/(32 g/mol) = 4.4 x 10⁻³ mol
As the heat is released, the change in enthalpy is a negative value: -3.04 kJ.
Finally, we divide the released heat (-3.04 kJ) into the number of moles of CH₃OH:
ΔHc= (-3.04 kJ)/(4.4 x 10⁻³ mol CH₃OH) = -694.8 kJ/mol ≅ -695 kJ
When 5,946 J of heat is added to 79.75 grams of oil at 37˚C , the temperature increases to 64˚C. What is the specific heat of the oil?
Answer:cool kid
Explanation:cool kid
Electrons make up most of the atom's mass. True or false ?
Answer:
No
Explanation:
Electrons have almost no mass so they cant make up the mass of an atom
Zinc reacts with lead (II) nitrate to produce zinc nitrate and lead. This reactions is:
Word form?
Answer:
Displacement Reaction
Explanation:
Zinc replaces lead in Lead(ll) nitrate as zinc is more reactive than lead.
i'll give brainliest
You live near the ocean and your friend lives further inland. Based on this, what can you say is most likely different about the climate in your area from your friend's area in the winter?
Your friend has colder winters than you do.
Your friend has warmer winters than you do.
You have less precipitation than your friend does.
You get more sunshine in the winter.
Answer:
I'm thinking its "Your friend had colder winters than you do."
Explanation:
It is not "Your friend has warmer winters than you do." Or "You Have less precipitation than your friend does." I was doing this quiz before that had this question and its not those.
In the ocean side the the winter will be colder by the ocean breeze in the day time. The location of your friend farther from the ocean will have warmer winters than you.
What is sea breeze ?Any wind that flows from a big body of water onto or onto a landmass is called a sea breeze or an onshore breeze. Sea breezes form as a result of changes in air pressure brought on by the different heat capacities of water and dry land. Sea breezes are therefore more confined than prevailing winds.
A sea breeze is frequently seen along coasts after sunrise because land warms up far more quickly than water does when exposed to solar radiation. While dry ground also cools faster than water, a land breeze or offshore breeze has the opposite effect.
In winter seasons, along with the sea breeze make the climate more colder than that in locations farther from oceans. Hence, option b is correct.
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___________ is used to produce 30% of the world's electricity.
Answer:
oil
Explanation:
coal be making most of the electricity
Answer:
power
Explanation:
As you walk up a mountain air pressure?
1. increases
2. decreases
3. remains the same
Answer:
decreases
Explanation:
Answer:
Decreases
Explanation:
There is less gas molecules and the air gets thinner the higher up you go
What is the molar mass of pure nitrogen gas? (*diatomic element) ?????
Answer:
14.0067 g/mol
Explanation:
The molar mass of pure nitrogen is 14.0067 because when you look at the top right of an element on the periodic table of elements you can see the molar mass of an element. This can go for any other elements on the table, just look at the top right of the box. The molar mass of an element is also called the atomic weight. Hope this helps! :)
How many molecules are there in 3.20 grams of NH4SO2
Answer:
0.0389757845886336
Explanation:
All objects made of matter create what pull?
Answer:
energy
that seems like the most relevant answer
If a particle had four atomic mass unit, two of which were neutrons, but had no electrons, what would the particle be?
Answer:
ALPHA PARTICLE => Helium Nucleus (He⁺²)
Explanation:
what is the formula for the ion potassium
Answer:
The formula for a Potassium ion is K+
If excess sodium sulfate react with 36 g of iron (III) phosphate and produce a 65.0% yield of sodium phosphate, how many grams of sodium phosphate are actually produced?
[tex]Na_2SO_4 + FePO_4[/tex] -> [tex]Na_3PO_4 + Fe_2(SO_4)_3[/tex]
Answer:
According to the stoichiometry, the theoretical yield is 11.5 grams. Multiplying this by 0.650, you get 7.48 grams.
Explanation:
What happens to the number of valence electrons as you move from element 1 to element 18 on the periodic table?
A)the number of valence electrons decreases
B)the number of valence electrons decreases then increases in a predictable sequence
C)the number of valence electrons increases
D)the number of valence electrons increases then decreases in a predictable sequence
Answer:
C
Explanation:
Answer: The answer is C
Explanation:
Adina is stranded on an island in the middle of the ocean. There is one stream on the island but the
water has lots of sand in it. Which technique should she use to remove the sand from the water?
Hint: give the technical term
Answer:Adina removed the sand, employing a shovel, however she be laborious and therefore the stream will carry off the silt and therefore the sand.
She does not have to be compelled to do something, however to attend.
You fill the metal pot with ocean water and boil the water, the water can turn out to be steam and can move upwards, there you would like to dam the steam victimization the long metal plate, so the steam condenses into pure water droplets.
The metal plate must be inclined so the droplets flow downwardly and at last falls into a clean pot.
Finally you get the water within the clean pot.
Explanation:
Another and short answer:
she can remove the sand , using a shovel , but that will be hard. eventually the stream will carry off the silt and the sand . thus she doesn't have to do anything , but to wait .
Please give brainliest and thanks
If the oceans of the earth got warmer from global warming, would the water of the oceans become more or less salty? What do you think the effect of this change in the ocean salinity (saltiness) would be on the plants and animals that live in the ocean?
Answer:
Warmer oceans affect weather patterns, cause more powerful tropical storms, and can impact many kinds of sea life, such as corals and fish. Warmer oceans are also one of the main causes of rising sea level. Check out the major effects of warmer oceans on people and the environment: Plants, Animals, and Ecosystems; Coastal Areas
Explanation:
The correct answer to the question is that the water of oceans will become less salty.
What is Global Warming?The Earth's climate system heating up over time and that can be referred to as global warming.This has been seen since before the industrial era and is the result of human actions, especially the combustion of fossil fuels.
What impact will global warming will have on ocean salinity?The seas are constantly becoming more and less salty due to evaporation, melting rivers and glaciers, and sea ice.Although it seems sense that more glacier melting would result in the seas being less salty generally as they rise, it's also true that saltier water lowers, so the waters at the surface might not be much saltier.So, it will become easy for us to use that water by separating the salt from it or may be it becomes less harmfull for living beings to drink.
Thus, we can conclude that the sea water will become less salty and may be used by living beings for various purposes.
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HELP ME ANSWER THIS
If you could somehow travel inside an atom and look around, what part of the atom would you want to look at? Why?
Answer:
I'd wanna see whats in the nuclues
Explanation:
Because its interesting to know what and how it really looks like up close. I also wanna know if an electron really has a light mass
Which ion has the electron configuration: 1s22s22p63p64s23d104p65s24d105p6
Answer:
It would be the chloride ion, with a charge of
1
−
.
Explanation:
A neutral chlorine atom has the electron configuration
1s
2
2s
2
2p
6
3s
2
3p
5
. In an ionic compound, chlorine gains the sixth
3p
electron, most likely when reacting with a metal such as sodium (Na), forming the chloride ion,
Cl
−
.
The image below represents the formation of the ionic compound sodium chloride,
NaCl
. The bond is formed by the electrostatic attraction between the positive and negative ions.
What differentiates solid, liquid and gas phases from each other? As part of your response discuss how the energy of attraction between particles compares with their energy of motion (i.e. their kinetic energy, Ek), the distances between particles, their compressibility and their relative viscosities (i.e. resistance to flow).
Answer:
I hope this helps
Explanation:
Solid = low kinetic energy, close distance between particles, not compresssible, higher flow resistance
Liquid = lower kinetic energy than gases, closer distance between particles than gases, relatively compresssible, high flow resistance than gases
Gas = high kinetic energy, far distance between particles, compresssible, low flow resistance
HELP ME WILL MARK BRAINIEST
Las reacciones de adición son... 2 reactivos producen 2 productos nuevos 2 reactivos producen un solo producto 1 reactivos produce 2 productos El reactivo es una sustancia carbonada y O2
Answer:
Las reacciones de adición son... 2 reactivos producen un solo producto.
Explanation:
Las reacciones de síntesis o combinación ocurren cuando dos o más reactivos forman un solo producto; generalmente se libera calor, siendo reacción exotérmica. También se les conoce como reacciones de adición.
En otras palabras, las reacciones de adición son aquellas en las cuales todos los átomos de los reactivos van a formar parte de un único producto. Uno de los reactivos (al que se le suele llamar sustrato) debe contener un enlace doble, o uno triple. Las Reacciones de Adición se dan principalmente en Química Orgánica donde los dobles y triples enlaces son comunes.
La característica principal de estas reacciones es que durante el proceso, el doble o triple enlace se rompe formando nuevos enlaces.
Las reacciones de adición son... 2 reactivos producen un solo producto.
two chemicals are mixed together and a gas is produced. *
chemical change
physical change
Answer:
chemical change
Explanation:
chemical change is when a substance combine with another substance to form a new substance.
Which is the correct formula for the ionic compound that results from these two atoms? PLS HELP!!!
Answer:
If I am not wrong is C x2y5
Explanation:
The concept of valency is used here to determine the formula of the ionic compounds. The number of valence electrons in 'X' is 2 and that of 'Y' is 5. The formula is X₃Y₂. The correct option is D.
What is an ionic compound?The crystalline solids which are formed by neatly packed ions of opposite charges are defined as the ionic compounds. These compounds are formed by the combination of metals with non-metals.
The combining capacity of an element is given by valency. The elements belonging to the same group have the same valency. It is related to how many electrons are in the outer shell.
Here the number of valence electrons in 'X' = 2
The number of valence electrons in 'Y' = 5
The element 'X' need 6 electrons to attain the octet and 'Y' needs 3 electrons to attain the octet.
X - 6
Y - 3
The formula of the ionic compound is X₃Y₂.
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Passenger airplanes take off in the troposphere but can eventually move into
the stratosphere. The planes may remain in the stratosphere until it is time to
land. Why do you think planes fly in the stratosphere?
4 ) which of the following is a true statement
5) what is true of all molecules based on the periodic table
a) they have electrochemical charges
b) they lack electrochemical charges
c) they have full outer electron shells
D) they contain at least one proton
Answer:
4:D 5:D
Explanation:
Which statement is true about heat transfer? *
5 points
a. Heat can only transfer when touching another object.
b. Heat always travels up.
c. Heat transfers from cooler to warmer objects.
d. Heat transfers from hotter to cooler objects.
Answer: A
Explanation:
heat always passes from a warmer object to a cooler object until all objects are the same temperature. Conduction is how heat travels between objects that are touching. Conduction travels fastest through solids, but liquids and gases can also conduct heat.
hydrogen gas reacts with oxygen gas to produce water. how many moles of hydrogen do you need to get 120 g of water? show work pleasee !!
ANSWER PLEASE FAST Plants produce oxygen during photosynthesis True OR False
Answer:
True
Explanation:
Which of the following best explains why bonds form between atoms?
A. Because the energy is at the minimum.
B. Because of the attractive forces between the nucleus of one atom and the electrons of the
atom.
other
C. Because atoms like to share electrons, which results in a stable system.
D. Because forming a bond fills up the valence shell of the atom giving a full octet.
19 Does ona moleculo of u
Answer:
D
Explanation:
I believe the answer is D because atoms are always seeking to fill up their outer electron shell/valence shell and want to gain a full octet.