Answer:
It is necessary to use models to study sub- microscopic objects such as atoms and molecules because they are too small to be seen.
Because they have an extended structure, elements that are _____
tend to be in the________
state at room temperature
Which of these steps is most likely to be part of an investigation about friction?
A.
putting different kinds of batteries in a toy car
B.
measuring how long it takes one full cup of water to evaporate
C.
testing which surface is easier to slide a wooden block across
D.
counting how many paper clips stick to a magnet in a chain
Answer:
I want to say option C: Testing which surfa e is easier to slide a wooden block across.
Explanation:
I'm not 100 % sure though with my answer. I'm truly so very sorry if my answer is wrong. I tried my best.
In physics, friction is said to be the opposing force that resists any object. Testing which surface is more effortless to slide a block across can be used to investigate friction. Thus, option c is correct.
What is friction?Friction has been defined as the resisting force that opposes the movement of objects across the surface. It can also be said as a force that opposes the relative motion of an object.
The friction can be rolling, sliding, fluid, or static depending on the surface and type of object. The frictional force is present only when the object has been in contact of the surface body.
When a surface is tested for sliding the wooden block, then the sliding friction has been used. It is possible as the resistant force of the surface with respect to the block is taken into the consideration.
Therefore, option C. the surface testing for sliding wooden blocks involves friction.
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What is the minimum cation-to-anion radius ratio (rC/rA) for an octahedral interstitial lattice site?
Answer:
0. 414
Explanation:
Octahedral interstitial lattice sites.
Octahedral interstitial lattice sites are in a plane parallel to the base plane between two compact planes and project to the center of an elementary triangle of the base plane.
The octahedral sites are located halfway between the two planes. They are vertical to the locations of the spheres of a possible plane. There are, therefore, as many octahedral sites as there are atoms in a compact network.
The Octahedral interstitial void ratio range is 0.414 to 0.732. Thus, the minimum cation-to-anion radius ratio for an octahedral interstitial lattice site is 0. 414.
What is the main "impurity" collected with the oil?
Answer:
Sulfur is considered an “impurity” in petroleum. Sulfur in crude oil can corrode metal in the refining process and contribute to air pollution. Petroleum with more than 0.5% sulfur is called “sour,” while petroleum with less than 0.5% sulfur is “sweet.”
Which of the following statements is NOT correct?
Florida’s Everglades are low-lying wetlands in South Florida.
Florida’s lakes were formed by melting glaciers 100,000 years ago.
Florida’s coastline consists mainly of dunes, marshes, and swamps.
Florida’s sinkholes are a result of chemical weathering processes from rainwater and groundwater.
Answer:
I guess number three (3) Is wrong
Answer: taking thisin advanced middle school math doubt thats college
Explanation: has to be b or c, asked my teacher honestly everybody on here said b but 1 person said 3 which is partially incorrect but uh
How does this particle arrangement of water change when heated from 46 Celsius to 102 Celsius
Explanation:
As a water is heated from 46°C to 102°C, the particle arrangement of the water molecules changes.
Water at 45°C is in liquid form. The molecules are still attached to one another and flows. Water heated through and now 102°C is now steam or vapor. The molecules have no attractive force between them again. These molecules are now in gaseous state. Also, they have become randomized.We use the term evaporation to describe this kind of change.
answer: the substance will change from a liquid state to a gaseous state
explanation: 46 degrees celsius means that the particles are in a liquid state, when the particles are heated up to 102 degrees celsius, it means that the particles are now in a gaseous state
Fruits and vegetables exposed to air begin to brown because of a chemical reaction in their cells. This may result in these foods being thrown out. Some people have found that adding lemon juice (citric acid) to apple slices keeps them from turning brown. The prevention of browning is likely the result of *
increasing the concentration of enzymes
increase in the temperature
slowing the rate of enzyme reaction
maintaining the pH
Answer:
slowing the rate of enzyme action
Explanation:
The prevention of fruits browning is the result of :
>slowing the rate of enzyme reaction
How is the browning of fruits prevented?The browning of fruits can be slowed down by preventing the enzyme from working properly. Lemon juice contains an acid which can stop enzymes from working properly. For example, water and sugar in jam prevents oxygen in the air to reach enzymes and hence protects from browning.
Always keep cut fruits such as apples, pears and peaches from turning brown by coating them with an acidic juice such as lemon or orange.
The enzyme that is responsible for the browning is called polyphenol oxidase. PPO enzyme in the presence of oxygen changes substances known as phenolic compounds, through oxidation, into quinones.
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What is the correct name for FeCl3
Ferric chloride (also called Iron chloride)
Find the Molarity of 6.25 grams of barium nitrate dissolved in 250 mL solution.
Answer:
0.096 M
General Formulas and Concepts:
Chemistry - Solutions
Writing compounds with polyatomic ionsMolarity = moles of solute / liters of solutionExplanation:
Step 1: Define
6.25 g Ba(NO₃)₂
250 mL
Step 2: Define conversions
1000 mL = 1 L
Molar Mass of Ba - 137.33 g/mol
Molar Mass of N - 14.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of Ba(NO₃)₂ - 137.33 + 2(14.01) + 6(16.00) = 261.35 g/mol
Step 3: Convert
[tex]250 \ mL(\frac{1 \ L}{1000 \ mL} )[/tex] = 0.25 L
[tex]6.25 \ g \ Ba(NO_3)_2(\frac{1 \ mol \ Ba(NO_3)_2}{261.35 \ g \ Ba(NO_3)_2} )[/tex] = 0.023914 mol Ba(NO₃)₂
Step 4: Find Molarity
M = 0.023914 mol Ba(NO₃)₂ / 0.25 L
M = 0.095657
Step 5: Check
We are given 2 sig figs as our smallest. Follow sig fig rules.
0.095657 M ≈ 0.096 M
Why does a rocket accelerate when launched into Earth's orbit?
Answer:
Earth's gravity is still pulling down on the rocket. When a rocket burns propellants and pushes out exhaust, that creates an upward force called thrust. To launch, the rocket needs enough propellants so that the thrust pushing the rocket up is greater than the force of gravity pulling the rocket down.
How many total electrons would that neutral atom contain? Answer
Answer:
Electrically neutral atoms simply possess the same number of electrons as protons. This gives the objects a balance of both type of charge. There are 11 electrons and 10 protons. This results in an imbalance of charge.
- Physicsclassroom
Answer:
Electrically neutral atoms possess the same number of electrons as protons. (It gives the objects a balance of both type of charge).
Explanation:
Fix the formula for Mg3F
Write out the full correct formula?
Answer:
[tex]MgF_2[/tex]
Explanation:
Hello!
In this case, since, when we see an ionic binary salt like that formed by magnesium (metal) and fluorine (nonmetal), in order to set up the correct molecular formula we need to check out the periodic table in order to identify the suitable oxidation states, since metals remain positively charged as they lose electrons and nonmetals negatively charged as they gain electrons.
In such a way, since the oxidation state of magnesium is +2 and that of fluorine is -1 we write:
[tex]Mg^{2+}F^-[/tex]
Next, we need to exchange the oxidation states as subscripts without the charge to obtain:
[tex]MgF_2[/tex]
Which is the corrected molecular formula for magnesium fluoride.
Best regards!
Which of the following best explains the uneven nature of the exposed rock layers
Answer:
where is the picture?
Explanation:
no picture at all....
Please help I’ll mark brainliest!
Answer:
D because excited electrons fall back.....
What symbolizes a seamount A:2 B:3 C:4 D:5
Answer B3
Explanation:
A large ice sculpture of a swan has a greater temperature than a lit match.
O True
O False
25POINTS!! useless answers will be reported
Assignment Summary
For this assignment, you will ask questions about the factors that have caused a rise in global
temperatures over the past century. Then, you will conduct research to answer your questions. You will
also graph provided information, analyze the graphs, and make conclusions based on the graphs. Finally,
you will write a paper describing the conclusions of your research and graphs.
Answer:
Life on Earth depends on energy coming from the Sun. About half the light reaching Earth's atmosphere passes through the air and clouds to the surface, where it is absorbed and then radiated upward in the form of infrared heat. About 90 percent of this heat is then absorbed by the greenhouse gases and radiated back toward the surface. Scientists attribute the global warming trend observed since the mid 20th century to the human expansion of the "greenhouse effect" warming that results when the atmosphere traps heat radiating from Earth toward space.
Certain gases in the atmosphere block heat from escaping. Air pollution is the main cause of rise in temperature over the past century. Due to increase in the industrialization in different countries of the world and also burning of more fossil fuels in the engines of vehicles and jets are the main reasons for increasing global temperature. On Earth, human activities are changing the natural greenhouse. Over the last century the burning of fossil fuels like coal and oil has increased the concentration of atmospheric carbon dioxide (CO2). This happens because the coal or oil burning process combines carbon with oxygen in the air to make CO2. To a lesser extent, the clearing of land for agriculture, industry, and other human activities has increased concentrations of greenhouse gases.
Climate extremes, such as droughts, floods and extreme temperatures, can lead to crop losses and threaten the livelihoods of agricultural producers and the food security of communities worldwide. Depending on the crop and ecosystem, weeds, pests, and fungi can also thrive under warmer temperatures, wetter climates, and increased CO2 levels, and climate change will likely increase weeds and pests.
Why does burning fossil fuel affect the environment?
How does the atmosphere play into this all?
How do cars affect the global climate?
How do greenhouse gases such as carbon dioxide cause global warming?
Explanation:
A mid-ocean ridge occurs at what boundary?
Answer:
Divergent boundary plate
Explanation:
I hope this helps but this question has its answer at the top of google when you search it
Question:
A mid-ocean ridge occurs at what boundary?
1. Convergent Boundary Plate
2. Divergent Boundary Plate
3. Transform Boundary Plate
Answer:
2. Divergent Boundary Plate
What are the large plates that move? O gigantic plates O tectonic plates O volcanic plates O rock plates
Answer:
Tectonic plates
Explanation:
Tectonic plates are large plates that moves. There are different types of plate motion as a result of mantle convection.
A tectonic plate is better as referred to as the lithospheric plate. It is made up of a part of the upper mantle and the overlying crust. Together, they move over the fluid asthenosphere below. The mantle below drives the lithosphere above.What do these two changes have in common? rain forming in a cloud water freezing into ice
Answer:
They're both examples of matter changing states.
Explanation:
Clouds = vapor, then forming rain = liquid
water = liquid freezing into ice = solid
Find the energy of a beam of x-ray radiation with a wavelength of 9.23
nanometers.
Answer:
E = 2.15 ×10⁻¹⁷J
Explanation:
Given data:
Wavelength of X-ray = 9.23 nm (9.23×10⁻⁹ m)
Energy of x-ray = ?
Solution:
Formula:
E = hc/λ
h = planks constant = 6.63×10⁻³⁴ Js
c = speed of light = 3×10⁸ m/s
by putting values,
E = 6.63×10⁻³⁴ Js × 3×10⁸ m/s /9.23×10⁻⁹ m
E = 19.89 ×10⁻²⁶ J.m/9.23×10⁻⁹ m
E = 2.15 ×10⁻¹⁷J
What state of matter can be compressed?
A. gases
B. solids, liquids, and gases
C. liquids
D. solids
Answer:
Liquids, They are the only one that can change shape to fit the container
Answer:
option A is correct.
Explanation:
The atoms and molecules in gases are much more spread out than in solids or liquids. They vibrate and move freely at high speeds. A gas will fill any container, but if the container is not sealed, the gas will escape. Gas can be compressed much more easily than a liquid or solid.
What is the most significant chemical difference between triacylglycerols and glycerophospholipids that leads to their different functions?
Answer:
Triacylglycerols (triglycerides) are non-polar or hydrophobic molecules
Glycerophospholipids (phosphoglycerides) are polar or hydrophilic
Explanation:
Triacylglycerides (TGs) are esters synthesized by the esterification of three molecules of glycerol and fatty acid, and this is essentially by the replacement of the three hydroxyl groups on glycerol with three fatty acids. This removes the hydrophilic property from the glycerol molecule hence TGs are only soluble in non-polar solvents like alcohol and benzene, and TGs are therefore the storage forms of fats in adipose tissues.
Glycerophospholipids are formed by the addition of two hydrophobic fatty acid groups and one phosphoric acid (phosphate group) to glycerol (alcohol) leaving a hydrophilic head (phosphate end) and a hydrophobic tail (fatty acid ends). This amphipathic property of this molecule makes it a suitable molecule for membrane structures, especially of cells (lipid bi-layer), with an arrangement where the hydrophilic side interacts with the aqueous environment, while the hydrophobic side makes contact with the non-aqueous environment.
Triacylglycerols-
They are nonpolar, hydrophobic, and insoluble in water. This is due to the ester linked bond between the polar hydroxyls of glycerol and the polar carboxylates of the fatty acids.Glycerophospholipids-
Glycerol-based phospholipids. The alcohol here is glycerol, to which two fatty acids and phosphoric acid are attached as esters. The two fatty acid chains attached to the molecule of glycerol are nonpolar hence hydrophobic While the polar heads which mainly consists of the phosphate group attached to the third carbon of the glycerol molecule is hydrophilic.Learn more:
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Which of the following shows the energy transformation that
occurs when solar panels are used to heat a building?
A
Light → thermal
B
Chemical → electrical
С
Thermal → chemical
D
Light - mechanical
Answer: either B, or D
Explanation:
because one of those are the answer
Answer:
A, because D destroyed my grade.
_____ Al(NO3)3 + _____ (NH4)3PO4 → _____AlPO4 + _____ NH4NO3
Answer:
1 Al(NO3)3 + 1 (NH4)3PO4 → 1 AlPO4 + 3 NH4NO3
Explanation:
To balance Al(NO3)3 + (NH4)3PO4 → AlPO4 + NH4NO3 you'll need to be sure to count all of the atoms on each side of the chemical equation. Once you know how many of each type of atom you can only change the coefficients (the numbers in front of atoms or compounds) to balance the equation.
Important tips for balancing chemical equations:
Only change the numbers in front of compounds (the coefficients). Never change the numbers after atoms (the subscripts). The number of each atom on both sides of the equation must be the same for the equation to be balanced.Every magnet must have what at its ends?
Answer:
A) a north pole and a south pole
Explanation:
As, a magnet will have a north pole in one of its end and a south pole in the other
why is temperature effective at speeding up a chemical reaction
Answer:
so basically the particles move faster
Explanation:
which is made from the cause of a chemical reaction do u get it now?
If 13.50 grams of hydrochloric acid (HCl) are reacted with excess calcium carbonate, how many grams of water are produced?
Answer:
3.3g
Explanation:
Given parameters:
Mass of HCl = 13.5g
Unknown:
Mass of water produced = ?
Solution:
The reaction equation is shown below;
2HCl + CaCO₃ → CaCl₂ + CO₂ + H₂O
To solve this problem, let us find the number of moles of the given specie first then we can use that to find the mass of the unknown water.
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of HCl = 1 + 35.5 = 36.5g/mol
Number of moles of HCl = [tex]\frac{13.5}{36.5}[/tex] = 0.37mol
From the balanced chemical reaction;
2 mole of HCl will produce 1 mole of H₂O
0.37mole of HCl will produce [tex]\frac{0.37}{2}[/tex] = 0.19mole of H₂O
So to find the mass of H₂O;
Mass = Number of moles x molar mass
Molar mass of H₂O = 2(1) + 16 = 18g/mol
Mass of H₂O = 0.19 x 18 =3.3g
HURRY PLEASE
Which are functions of the stomata in the leaves of seed plants? Check all that apply.
reduce water loss
make glucose
absorb sunlight
take in carbon dioxide
produce oxygen
Answer:
reduce water loss
absorb sunlight
take in carbon dioxide
produce oxygen
Explanation:
i think
Answer:
A, D, and E
Reduces water loss, take in carbon dioxide, and produce oxygen.
Explanation:
balance NO + 02 -- NO2
Answer:
NO + O2 -> NO2
it is balanced
