Answer: True
Explanation:
Mendeleevs periodic classification is based on the atomic masses of the elements.
This flow chart shows the amount of energy that is emitted by each type of light. ultraviolet > blue light > yellow light > red light (maximum energy) (minimum energy) In an experiment, shining which type of light on a strip of metal would be least likely to produce the photoelectric effect?
Answer: bright red light
Explanation:
im taking edge
An ion is neutral and has no charge. True or False
Answer:
Explanation:
False but I could be wrong but I’m pretty sure.
Answer:
False.
Explanation:
An ion has an imbalanced number of protons and electrons. Hope this helps! =)
If your mixing cement for the foundation of a building and it calls for 1.55 tons of sand, how many grams of a sand are you using? Please show your work, and report your answer with the correct number of significant figures and appropriate units.
Answer:
1406136 grams
Explanation:
what is the safety rule that keeps ocean from being poisoned?
Answer:
Death in the Water: How Plastic Is Poisoning Our Oceans
Liz Greene February 17, 2017
We live in a society obsessed with convenience, and that obsession has made plastic king. Though humankind has greatly benefited from plastic, the environmental costs of this reigning polymer may bring about our downfall. Traveling from land to sea in the wind or through waterways, plastic pollution is causing extensive damage to our marine life and giving life to one of the greatest ecological disasters of our times.
Plastic has been collecting in the marine environment since plastic production began in the 1950s — in fact, each square mile of the ocean contains more than 46,000 pieces of floating plastic. Eight million metric tons of plastics make their way into the ocean each year, hitching a ride on the currents and reaching the furthest corners of our seas — even turning up in the Antarctic wilderness. Simply put, the world’s oceans are becoming a toxic soup of plastic and other debris, and all life is being negatively affected.
Unfortunately, plastic doesn’t biodegrade — though it does eventually photodegrade (i.e., break down into smaller fragments by exposure to the sun). Photodegradation of plastic continues to the molecular level, yet photodegraded plastic remains a polymer. No matter how minute the pieces, they will always be plastic. Unlike naturally based paper or glass, they are not absorbed into or changed by natural processes — plastic never truly goes away.
Explanation:
This is a really good article I found, hope it helps
state two things you notice when a metal is touched
Answer:
touched touched
Explanation:
rusting can occure
sonority may take place
Students in physics class are asked to find the relationship between the length of a pendulum (string with a weight at the bottom) and the time it takes for one pendulum swing. What is the dependent variable in this experiment?
Answer:
1)[tex]Time \ for \ pendulum \ swing \ left \ and \ right = 2 \times \pi \times \sqrt{\dfrac{Length \ of \ the \ pendulum \ string}{g} }[/tex]
2) The dependent variable = The time it takes for one pendulum swing
3) The independent variable = The length of the pendulum string with weight at the bottom
Explanation:
The relationship between the length of the pendulum string and the time it takes for one pendulum swing is giving as follows;
[tex]T = 2 \cdot \pi \cdot \sqrt{\dfrac{L}{g} }[/tex]
Where;
T = The period of oscillation = The time to complete one oscillation =Two swings of the pendulum
L = The length of the pendulum
g = The acceleration due to gravity
Therefore, the time it takes for one pendulum swing is directly proportional to the square root of the length of the pendulum
The dependent variable = The time it takes for one pendulum swing
Th independent variable = The length of the pendulum string with weight at the bottom.
What are the best titles a and b A science b pseudoscience
i don't really know what you are trying to say here, but what i think you are saying is what sounds like a more impressive job?? in my opinion, pseudoscience sounds more fancy and interesting. Since not a lot of people really knows what that is, it sparks conversation.
Answer:
https://brainly.in/question/5343031 use this link
Explanation:
According to the question;
A student takes notes in class as shown below. A. Uses an objective process Is updated constantly B. Is not objective Does not use a process Resists new information.
So the best titles for circumstances A and B will be :
Option C ;
A) characteristics of science because of the scientific methods used for notes taking
B) limitations of science because of the non scientific method or Science resistive methods used for notes taking
A chemistry class is experimenting with iodine to see which common white powder items will react and make the iodine change color. Which item listed will have a chemical reaction with iodine?
Answer:
The question did not contain any listed options. However, starch is a common white powder that will give a color change on reacting with iodine molecules
Explanation:
Iodine is a common indicator used in the lab to detect the presence of starch or starchy substances.
Iodine molecules react with amylose in starch to form a complex with a deep blue-black coloration.
Hence, a common white powder which reacts with iodine molecules to give a blue-black color must be a substance that contains starch.
The answer is:
d) cornstarch
Find the density of a substance that has a mass of 75 g and a volume of 35 mL. Don't forget your units!
Answer:
The density of a substance that has a mass of 75 g and a volume of 35 mL is 2.14 [tex]\frac{g}{mL}[/tex]
Explanation:
Density is a characteristic property of a substance that relates to the amount of mass it has per unit volume. In other words, density is the property that matter, whether solid, liquid or gas, has to compress into a given space (it measures the amount of mass in a given volume of a substance). It is calculated as the quotient between the mass of a body and the volume it occupies:
[tex]density=\frac{mass}{volume}[/tex]
In this case, you know:
mass= 75 gvolume= 35 mLReplacing:
[tex]density=\frac{75 g}{35 mL}[/tex]
Solving:
[tex]density=2.14\frac{g}{mL}[/tex]
The density of a substance that has a mass of 75 g and a volume of 35 mL is 2.14 [tex]\frac{g}{mL}[/tex]
The density should be2.14 g/ml.
Given that,
A mass of 75 g and a volume of 35 mL.Based on the above information, the calculation is as follows:
[tex]Density = mass \div volume\\\\ = 75 \div 35[/tex]
= 2.14 g/mL
Learn more: https://brainly.com/question/15959704?referrer=searchResults
the hypothesis can be accepted because the electromagnet with the longer cooper wire had great strength
I uh- I'm a bit confused- W h a t
Explain why a liquid can flow whilst a solid retains its shape.
Answer:
A solid will retain its shape; the particles are not free to move around. Liquid matter is made of more loosely packed particles. It would take the shape of its container. Particles can move about within a liquid, they are packed densely enough that volume is maintained.
Explanation:
Time Remaining: 1:27:31 If 50.0 g of H₂ and 100.0 g of O₂ react, how many moles of H₂O can be produced in the reaction below? 2 H₂(g) + O₂(g) → 2 H₂O(g
Answer:
Explanation:
2 H₂(g) + O₂(g) → 2 H₂O(g
2 moles 1 mole 2 mole
50 g of H₂ = 50 /2 = 25 moles of H₂
100 g of O₂ = 100 / 32 = 3.125 moles of O₂
So oxygen is the limiting reagent .
3.125 moles of O₂ will react with 6.25 moles of H₂ to give 6.25 moles of H₂O .
Hence moles of H₂O produced = 6.25 moles .
Provide two arguments on why you don't notice the land moving beneath you, defend your answer.
Answer:
The reference point is the ground.
Explanation:
•Moves slow that you don't notice hope this helps you :) god loves you :)
13. Which statement best describes an element? *
O any combination of two or more atoms of different types
a pure substance made up of only one kind of atom
O
a substance containing only water molecules
O any kind of crystal
Explanation:
Distinguish chemical substances from mixtures
Key Points
Matter can be broken down into two categories: pure substances and mixtures. Pure substances are further broken down into elements and compounds. Mixtures are physically combined structures that can be separated into their original components.
A chemical substance is composed of one type of atom or molecule.
A mixture is composed of different types of atoms or molecules that are not chemically bonded.
A heterogeneous mixture is a mixture of two or more chemical substances where the various components can be visually distinguished.
A homogeneous mixture is a type of mixture in which the composition is uniform and every part of the solution has the same properties.
Various separation techniques exist in order to separate matter, including include distillation, filtration, evaporation and chromatography. Matter can be in the same phase or in two different phases for this separation to take place.
Terms
substanceA form of matter that has constant chemical composition and characteristic properties. It is composed of one type of atom or molecule.
elementA chemical substance that is made up of a particular kind of atom and cannot be broken down or transformed by a chemical reaction.
mixtureSomething that consists of diverse, non-bonded elements or molecules.
Answer:
a pure substance made up of only one kind
Explanation:
10) What are the four main spheres of planet?
Answer:
the four main spheres of the earth are geosphere, hydrosphere, atmosphere and biosphere
Explanation:
geosphere consists of all rocks on Earth
atmosphere which are the gases that surrounds the earth
hydrosphere which is all the water on the earth
biosphere which are the living things on the earth
Dos vehículos colisionan. Se sabe que antes del choque el vehículo 1 de masa "m", se desplazaba horizontalmente hacia la derecha con U1=10 m/s y el vehículo 2 cuya masa es el 30 % de la masa del vehículo 1, se desplaza horizontalmente hacia la izquierda con velocidad de 8m/s. Si hay pérdida de energía en la colisión, la expresión matemática que mejor representa dicha situación es:
Answer:
translate? ill edit this later
Explanation:
All of the following are true statements EXCEPT a. Solids have a definite volume and a definite shape. b. Liquids have less energy than solids. c. There are no intermolecular interactions between the particles of a gas. d. Sublimation occurs when a solid phases into a gas.
Answer:
The correct answer is B. Liquids have less energy than solids. This is false because liquids have more energy than solids; the particles in a liquid are moving whereas the particles in a solid are almost still (they may vibrate slightly). This increase in speed of particles translates to kinetic energy, showing us that liquids have more energy than solids.
Explanation:
We can also examine the other answer choices and show why they are incorrect.
Solids have a definite volume and shape. Think about solids in your house; for example, think about a chair or a block. The shape of these items cannot be changed, and their volume is unchanging.
There are no intermolecular forces between the particles of a gas. This is assumed to be a property of an ideal gas, which makes sense since the particles in a gas are farther from each other than those in a liquid or a solid.'
Sublimation occurs when a solid turns into a gas. This is also a true statement; when a solid sublimes, it changes into a gas without ever becoming a liquid.
Hope this helps!
On a cold morning, the smoke coming out of a chimney is observed to be in blue color. What could be the reason? Name the effect and the reason for the effect
Stack effect? I'm not totally sure about this...
Explanation:
Large amount of tiny particles of water droplets, dust and smoke are present on a misty day. These tiny particles in the air scatter blue colour of white light passing through it. When this scattered light reaches our eyes, the smoke appears blue.
what kind of waves are water waves?
Explanation:
Water waves are an example of waves that involve a combination of both longitudinal and transverse motions. As a wave travels through the waver, the particles travel in clockwise circles. The radius of the circles decreases as the depth into the water increases.
what are the four rules for significant figures
Answer:
Significant Figures
Explanation:
1) Annotation category: ...
2)RULES FOR SIGNIFICANT FIGURES.
3) All non-zero numbers ARE significant. ...
4)Zeros between two non-zero digits ARE significant. ...
5)Leading zeros are NOT significant. ...
6)Trailing zeros to the right of the decimal ARE significant. ...
7)Trailing zeros in a whole number with the decimal shown ARE significant. 8) to make you happy :) hope this helps you :)
What is the maximum amount of electrons that can be in the third energy level of an atom? (question continued in comments)
Answer:
18 electrons
Explanation:
If you search on Google you get the same answer, so the question gives you your answer.
Hunter is copying an angle. His work so far follows. Explain the importance of his next step. Which is drawing A-line through A and Y using a straight edge
Answer:
its c ma man .
This is the other ray that will make up the angle ∠AYZ and will complete the constructioExplanation:
if your taking the quick check these were my awnsers
1.c
2.b
3.d
4.c
5 .A
for the copying an angle quick check only
If an atom has 15 electrons, how many protons does the atom have?
A:16
B:15
C:14
D:this cannot be determined without looking at a periodic table first
Answer:
15
Explanation:
it would probably be the same number!
Answer:
Explanation:
15
What is the meaning of electrolysis?
Answer:
A process in which a chemical change, especially decomposition, is brought about by passing an electric current through a solution of electrolytes so that the electrolyte's ions move toward the negative and positive electrodes and react with them.
Answer:
a pgsysyyssysyysysyshshshshshshshshshshshshshss
my baby mama hates me, what do i do?
Answer:
Buy her food
Explanation:
food always helps bro. trust.
Answer:
Just talk to her , maybe you did something in the past to hurt her ? Remember to think about the baby and if doesn't work out try to be good co parents together.
Explanation:
zinc does not give hydrogen on reaction with nitric acid
Answer:
The Hydrogen gas produced during its reaction with metal gets oxidised to H2O, hence no hydrogen gas is produced. Instead it evolves nitric oxides such as NO2,NO etc.
If all cells are created by other living cells, which of the following is true?
O Spontaneous generation cannot occur
O Plant cells come from other plant cells
O Cells divide for
reproduction
O All of the answers are correct
cells divide for reproduction
Can water stay liquid below zero degrees Celsius?
Calculate the solubility of CaF2 in water at . You'll find data in the ALEKS Data tab. Round your answer to significant digits.
Answer:
[tex]0.016\frac{g}{L}[/tex]
Explanation:
Hello,
In this case, the dissociation of calcium fluoride is:
[tex]CaF_2(s)\rightleftharpoons Ca^{2+}(aq)+2F^-(aq)[/tex]
And the equilibrium expression is:
[tex]Ksp=[Ca^{2+}][F^-]^2[/tex]
Which is useful to compute the molar solubility, symbolized by [tex]x[/tex] as the reaction extent:
[tex]Ksp=(x)(2x)^2[/tex]
In such a way, since the solubility product of calcium fluoride at 25 °C is 3.45x10⁻¹¹, the molar solubility is found to be:
[tex]3.45x10^{-11}=(x)(2x)^2\\\\x=\sqrt[3]{\frac{3.45x10^{-11}}{4} }\\ \\x=2.05x10^{-4}M=2.05x10^{-4}\frac{molCaF_2}{L}[/tex]
And the solubility, considering its molar mass 78.08 g/mol is:
[tex]=2.05x10^{-4}\frac{molCaF_2}{L}*\frac{78.08gCaF_2}{L}\\ \\=0.016\frac{g}{L}[/tex]
Regards.
The reaction NO2(g) + CO(g) → NO(g) + CO2(g) has been found to be second order with respect to NO2 and zero order with respect to CO. At a certain temperature, the rate constant is found experimentally to be 3.0 × 10−5 L mol · s . What is the rate of formation
Answer:
The answer is " [tex]122.88 \times 10^{-5}[/tex]"
Explanation:
In the given question some data is missing. so, the correct solution can be defined as follows:
Missing values:
[tex]k= 3.0 \times 10^{-5}\\\\NO_2 =6.4 \ mol / l \\\\CO= 4.1 mol / l \\\\NO= 5.2 mol / l \\\\CO_2= 1.3 mol / l\\[/tex]
Given equation:
[tex]NO_2(g) + CO(g) \longrightarrow NO(g) + CO_2(g)[/tex]
In the above equation, the rate is [tex]=k.[NO_2]^2[/tex] because the above given is the part of the second-order, which relates to [tex]NO_2[/tex]. In the zeros order the Carbon monoxide (CO) its reaction doesn't affect the rate.
Calculating the rate:
Rate [tex]=k.[NO_2]^2[/tex]
[tex]= 3.0 \times 10^{-5} \times 6.4^2\\\\=3.0 \times 10^{-5} \times 40.96\\\\= 122.88 \times 10^{-5}\\[/tex]