The reason wet clothes spread out dry faster than when left in a pile is because there is more surface area therefore the rate of evaporation increases and this decreases the time it takes for the water molecules to diffuse into the air.
Which of the following aspects of kinetic-molecular theory explain why a plasma-based light doesn’t get unbearably hot? Select all that apply.
Particles exchange energy through elastic collisions.
All particles are in constant random motion.
Particles are small.
Except during collisions, interactions between particles are negligible.
The temperature depends only on the average kinetic energy of the particles.
Answer:
Particles exchange energy through elastic collisions.
All particles are in constant random motion.
Except during collisions, interactions between particles are negligible.
Temperature depends only on the average kinetic energy of the particles.
Explanation:
Answer:
A,B,D,E egd
Explanation:
There is a different Safety Data Sheet for every chemical.
Select one:
O True
o False
Answer:
True
Explanation:
This is true because every chemical reacts differently
1. What is the state of matter of each of these materials at room temperature? a) gold b) gasoline c) oxygen d) olive oil e) mercury (found in thermometers) f) aluminum
Answer:
a) gold - Solid
b) gasoline - liquid
c) oxygen - gaseous
d) olive oil - liquid
e) mercury (found in thermometers) - liquid
f) aluminum - solid
Explanation:
Matter exists in three states viz: solid, gas and liquid. Note that, room temperature is a neither hot or cold temperature, which is about 20-23°C.
A) Gold is a transition metal with the symbol Au. At a room temperature, Gold, like most metals are found as SOLIDS.
B) Gasoline is a liquid mixture of refined hydrocarbons majorly used as fuels.
C) Oxygen is a chemical element with symbol O. It is a constituent of natural air, which is a mixture of different gases including oxygen. Hence, at room temperature, Oxygen is a gas.
D) Olive oil is a vegetable oil got from olives. It is composed of fats and it's a liquid at room temperature.
E) Mercury is an element with symbol Hg. It is the only metallic element found naturally (at room temperature) as a liquid. It is used in thermometers.
F) Aluminum is another chemical element with symbol Al. It is a lustrous metal that occurs as a Solid in room temperature.
Which of the following products is not derived from cellulose
Answer:
1.asphalat 2.DDT 3.cellulose 4.polystreyne 5.nylon
Answer: Petroleum
Explanation:
Habits of Highly Organized People Edpuzzle
OPEN ENDED QUESTION
What is one benefit of being organized?
Answer:
Explanation: one benefit of being organized is
More Focused
Productive
Sleeping Better
Saving Money
Healthier Physically
Social Life Improves
More Free Time
Gratitude
Less Stress
Happiness
Which of the following is an example of how chemicals can both hurt and
help the environment?
A. Chemicals in a volcano's lava can harm plants, and some
chemicals can be used to determine what is in lava.
B. Chemicals are used to protect skin from the sun and also to help
skin tan.
C. Chemicals can pollute water, but they can also be used to clean
water.
D. Chemicals are used in artists' paints and also are used to clean
artists' paintbrushes.
Answer: C
Explanation: Because I just did the test lol.
Chemicals are substances that can be natural or man-made. It can both hurt and help the environment as they pollute water and can also clean water. Thus, option C is correct.
What are the effects of chemicals?Chemicals are compounds that are synthesized artificially and have various uses and applications in various fields. They can be both beneficial and detrimental to the environment and the ecosystem.
Chemicals like that from factories, pesticides run-off from agricultural fields, drugs, microorganisms, fertilizers, radioactive substances, etc, cause water pollution by acting as contaminants.
On the contrary, chemicals can be used to clean water pollution. Chloramine and chlorine are the most common chemical disinfectants that cleanse contaminated water to make it useful.
Therefore, option C. chemicals can both clean and pollute water.
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recall the definition of an acid that you learned in chemistry. Explain how the reaction blow illustrates the acididc properties of laactic acid.
Answer:
Lactic acid is used to prepare medicine. It is colorless, can be solid or liquid form.
Explanation:
Acids are sour in taste. It changes the color and taste of the chemical. It reacts with some chemicals metals and produce the hydrogen. It react with hydrogen. I also react with the bases and produce the salt. It also promotes some of the chemical reaction. For example nitric acid, phosphoric acid sulfuric acid and the organic acids.
The lactic acid is soluble with ethanol and water. It is produced by the reaction of two strategies, the synthetic method and biotechnological methods. It is produced at very large scale by the help of fermentation. Lactic acid is colorless, in liquid or solid form. It is a weak acid and can react in the way as the stronger acids react.
what were the limitation of debereiner's law of traid
describe how you could prove that a bicycle is matter
Atoms are the building block of science for starters meaning that all solid and liquid thing will contain atoms. Matter is anything that has mass and takes up space. So, in order to prove that air is matter, we need to prove that air has mass and takes up space. To prove that a bicycle has matter, you would need to show that it has a weight and will take up space.
Thank you hope this helps you out!
12.60 m has
significant figures.
Answer:
4
Explanation:
Answer:
12.60 m has 4 significant figures.
Explanation:
On Edge 2021
You titration 5.0 mL of HCl with 0.010 M NaOH. You find the end point of your titration occurs when 12.0 mL of NaOH has been added. What is the total volume of the solution at the end point of the titration
your answer is 0.00833M the volume was converted into liters
NaOH(aq)+HCl(aq)→NaCl(aq)+H2O(l)
Using the molarity equation, we can find the number of moles of HCl that reacted:
molarity=mol soluteL soln
mol solute=(molarity)(L soln)
mol HCl=(0.105molL)(0.0250L)=0.00263 mol HCl
(volume converted to liters)
Now, using the coefficients of the chemical reaction, we can determine the number of moles of NaOH that reacted:
0.00263mol HCl(1lmol NaOH1mol HCl)=0.00263 mol NaOH
Lastly, we'll use the molarity equation (using given volume of NaOH soln) again to determine the molarity of the sodium hydroxide solution:
molarity=mol soluteL soln
describe how carbon skeletons may vary and explain how this variation contibutes to the diveristy and complecity of organic moleculs
Answer:
Carbon is a highly covalent element due to the presence of four valence electrons in its outermost shell. This helps it bond covalently with other elements in various ways.
Carbon is known to be the backbone for most compounds. The carbon backbone vary in length and in the mode of bonding such as having the ability to from straight, branched, rings, double or triple bond which contibutes to the diversity and complexity of organic molecules.
3. Express the number 0.0880 in scientific notation.
A) 880 x 10-4
B) 8.80 x 102
C) 8.8 x 10-2
D) 8.80 x 10-2
0.880 x 10-1
Answer:D
Explanation:
Move the decimal forward 2 times.
how many significant figures does 4,982cm have
Answer:
4 significant figures.
Explanation:
All non-zero numbers are significant figures.
which of these time measurements is the smallest? 0.02 seconds, 0.02 teraseconds, 2,500 milliseconds, or 25,000 nanoseconds?
Answer:
25000 nanoseconds
Explanation:
Answer:
i think it's 25,000 nanoseconds :)
Explanation:
Classify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous: sand, air, tomato juice, iodine crystals.
Explanation:
What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Mixtures concept. You can view video lessons to learn Mixtures. Or if you need more Mixtures practice, you can also practice Mixtures practice problems.
What is the difficulty of this problem?
Our tutors rated the difficulty ofClassify each of the following as a pure substance or a mixt...as low difficulty.
How long does this problem take to solve?
Our expert Chemistry tutor, Dasha took 4 minutes and 29 seconds to solve this problem. You can follow their steps in the video explanation above.
What professor is this problem relevant for?
Based on our data, we think this problem is relevant for Professor Gulde's class at UB.
What is the density of an unknown object that has a mass of 5.0 g and volume of 20
ml?
Answer:
Density=mass / volume.
Density = 5/20.
0.25g/cm^3.
The density of the unknown object is 0.25 mL
Density of an object is defined as the mass of the object per unit volume of the object. Mathematically, it can be expressed as:
[tex]Density = \frac{mass}{volume} \\ \\ [/tex]
With the above formula, we can obtain the density of the unknown object as follow:Mass = 5 g
Volume = 20 mL
Density =?[tex]Density = \frac{mass}{volume} \\ \\ Density = \frac{5}{20} \\ \\ Density = 0.25 \: ml[/tex]
Therefore the density of the unknown object is 0.25 mL
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How many km are equal to 1.55 x 10^4 m?
Answer:
15.5 km
Explanation:
1.55x10^4m
1.55x10000m
15500m
1km=1000m
b=15500m
1km*15500m=b*1000m
1km*15500m/1000m=b*1000m/1000m
b=15.5km
Hope this helps ;) ❤❤❤
Are changes in the state of matter (phase) considered physical or chemical changes? Why?
Answer:
Physical changes
Explanation:
Changes in the state of matter are physical changes.
First, the material is made up of the same components that is was before it changed states.
The physical properties of the material changed, but its chemical composition did not, meaning that is is a physical change.
Answer:
Physical change
Explanation:
Matter can change between phases, so they are reversible physical changes that do not change matter’s chemical composition.
Changes of state are physical changes in matter. They are reversible changes that do not change matter’s chemical makeup or chemical properties. Water, for example, can be a solid (ice), a liquid (drinking water), or a gas (steam). Those are physical changes that don't change the fact that water is always chemically made up of H2O (two hydrogens and one oxygen).
4. Express the number 9.95 x 10-3 in common decimal form.
A) 0.00995
B) 9.95
C) 9950
D) 0.0995
E) 0.000995
Answer:A
Explanation:
Move the decimal forward 3 times.
The light reactions synthesize ATP, NADPH, and O2 using which of the the following process(es):
a. oxidation only
b. reduction only
c. neither oxidation, reduction, nor electrolysis
d. oxidation and reduction oxidation
e. reduction, and electrolysis
Answer:
D . oxidation and reduction oxidation
The light reactions synthesize ATP, NADPH, and oxygen using oxidation and reduction. Therefore, option D is correct.
What do you mean by the oxidation and reduction ?The term oxidation is defined as the loss of electron and tha term reduction is defined as the gain of electron. When oxidation and reduction takes place simultaneously is called as redox reaction.
In the light reactions, energy from sunlight drives the synthesis of ATP and NADPH, the formation of O2 from H2O.
During the light reactions, water is oxidized, electrons are shifted from water to NADP+, and ATP is compounded. The three components of the light reaction can be resumed with equations: Oxidation of water. 2 H2O 02 + 4e- + 4 H.
Thus,The light reactions synthesize ATP, NADPH, and oxygen using oxidation and reduction, option D is correct.
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Why Aluminium oxide has higher melting point than Alumunium Chloride?
Answer:
They have high melting points . They have ionic
giant lattice structures : strong force of attraction between inland so have high melting points . They are iconic because of large electronegativity differences between the metal and oxygen ....Aluminum oxide (Al203) is ionic but does show some covalent character.
A 1.0 mol sample of which of the following compounds has the greatest mass?
A. NO
B. NO2
C. N2O
D. N2O5
Answer:
(D) is the correct option.
Explanation:
Molar mass of NO = (14+16) g/mol = 30 g/mol
Molar mass of NO₂ = (14+16×2) g/mol = 46 g/mol
Molar mass of N₂O = (14×2+16) g/mol = 44 g/mol
Molar mass of N₂O₅ = (14×2+16×5) g/mol = 108 g/mol
Number of moles = mass/molar mass
mass = n × M, M = molar mass
n = 1 mol in each case
Higher the molar mass, greater is the mass of the compound. The molar mass of N₂O₅ is greatest of all other cases. It will have greatest mass.
What is physical and chemical changes in your own word?
Answer:
physical is the change that doesn't effect the identity of the object chemical changes the identity of the object.
Which tool gives scientists information about the wind speed and humidity of a region?
Answer:
Anemometer. An anemometer is a type of weather instrument that measures wind speed.
A sample of water has a volume of 24.0 milliliters and a density of 0.992 g/mL. What is its mass? 1) 23.8 g 2) 24.2 g 3) NONE
Answer:
23.8
Explanation:
The formula for density is D=M/V, where D stands for density, M stands for mass, and V stands for volume. In this case, we are solving for mass, so we have to cross multiply the equation to isolate the variable of M. Once we cross multiply, we get the equation M=DV, and then we start to substitute the values into the equation. M=(.992g/mL)(24.0mL) is the equation, and once we multiply, we get 23.808 as the answer. But when figuring out density, mass, or volume, we need to utilize sig figs. Since the two numbers that you are multiplying both have 3 sig figs, the answer must have three sig figs. Round up or down based on the place value that you are rounding to. Since we are trying to get an answer that is in the tenths place, we round down to 23.8, which is the answer.
Which of the following types of energy does an object store in the bonds of atoms and molecules? (5 points)
Оа
Chemical energy
Ob
Gravitational energy
Ос
Kinetic energy
Od
Sound energy
Answer:
sound energy
Explanation:
Answer:
Chemical energy
Explanation:
Aluminum sells for $0.35 per meter. How much does a piece of aluminum 5.12 kilometers long cost?
Why do you think people have stopped believing in and trusting science?
Is it really healthy to drink a monster? I mean I feel kinda tired rn
Answer:
Yes
Explanation: It is just caffeine and if it is just one it will not hurt