Answer:
They are highly lustrous metals which are resistant to corrosion. They are highly malleable and ductile so can be transformed into any shape or design.
Explanation:
a sample that has a half life of 45 years take ____ for the count rate to drop from 600 cpm to 150 cpm
Answer:
90yrs
Explanation:
Half life is the time taken for half of an original radioactive material to decay by half.
For the sample;
Half - life = 45yrs
Original amount = 600cpm
Start Number of atoms
0yrs 600cpm
First half life
45yrs 300cpm
Second half life
90yrs 150cpm
Which characteristic applies to all mixtures, including solutions?
a) Mixtures must be composed of compounds.
b)Mixtures are composed of a single element.
c)Mixtures are composed of two or more substances.
d)Mixtures have uniform structures throughout entire samples.
Answer:
c)Mixtures are composed of two or more substances.
Explanation:
From the given choices, it is true that mixtures are composed of two or more substances.
Mixtures have indefinite composition i.e. they consist of two or more compounds in any proportion by mass.Constituents retain their identity. The constituents reacts differently to changed conditions. They can easily be separated into constituents.1.- ¿Qué relación hay entre el uso óptimo de artefactos eléctricos en el hogar y el consumo de energía eléctrica? 2.- ¿Qué conocimientos de la física explican el uso óptimo de energía eléctrica? 3.- ¿Cómo se determina el consumo mensual de energía eléctrica? 4.- ¿Cómo se calcula el costo de este servicio?
Answer:
1- El uso óptimo de artefactos eléctricos en el hogar y el consumo de energía eléctrica tienen una relación de absoluto ligamen. Así, a mayor cuidado del consumo, y mejores los artefactos en su relación prestación/consumo, menor será el consumo de energía eléctrica en el hogar y, por ende, menor el gasto en el servicio.
2- El uso óptimo de energía eléctrica se explica a través de la física mediante el concepto de resistencia eléctrica, es decir, a mayor resistencia eléctrica, mayor será el consumo que el artefacto generará.
3- El consumo mensual de energía eléctrica se determina a través de la cantidad de kilovatios que cada hogar consume mensualmente. Así, a mayor cantidad de kilovatios (que es la unidad de medida de la energía eléctrica), mayor será el consumo.
4- El costo del servicio se valúa en función de los kilovatios consumidos en el periodo de medición. Así, cuando mayor sea el consumo mayor será el costo; incluso en algunos lugares, como Argentina, cuanto mayor sea el consumo de electricidad, mayor será el costo del kilovatio.
Please help me ASAP!!!!!!
How many moles are present in 5.24 x 1023 molecules of CH4?
I hope this helps. I am in a lower grade than you, I am assuming, but I wanted to help you
Answer:
40
Explanation:
Which orbital can be modeled by a "peanut" shape?
Answer:
d - orbital
Explanation:
The d-orbital can modelled by a peanut shape.
A peanut shape closely resembles the shape of a double dumb-bell shape. The double dumb-bell shape is like that of a peanut.
The s-orbital has a spherical shape. p - orbital is dumb-bell shapedd - orbital is a double dumbellf - orbital has a complex shape.Therefore, since a peanut is like a double dumb-bell, it clearly models the d-orbital.
plzzzz help me I will mark u brainist
Answer:
B. Aluminum has layers of electrons that can slide over one another.
Help quickly please, actual answer
Answer:
the answer is d i think probably of the format of that place of the only on to 9 so its d
Atoms of Oxygen-16, Oxygen-17 and Oxygen-18 have the same number of _________________?
Answer:
Atomic number or number of protons
Explanation:
The given species are all isotopes of oxygen. Isotopes have the same number of protons or atomic number. They only differ in the number of neutrons.
Isotopy is the existence of two or more atoms of the same elements having the same atomic number but different mass number. The different mass number is due to differences in their number of neutrons. Isotopes have the same electronic configuration and hence, they have the same chemical properties. Isotopes only differ in their masses.calculate the number of neutrons in the chorine 17CI and 17CI
Answer:
18 neutrons
Explanation:
In the element;
₁₇Cl
The number of electrons in the chlorine atom is 17.
The mass number of chlorine is 35.
Mass number is the number of protons plus number of neutrons.
Mass number = Protons + neutrons
Neutrons = mass number - protons
Number of protons in chlorine is 17;
So;
Neutrons = 35 - 17 = 18
Finding the mass of a bar of aluminum is 25 grams is it hypothesis observation inference or guess
Answer:
It is a observation
Explanation:
Tin-126 has a half life of 100,000 years. How many years does it take to
reduce 100 g of Tin-126 to 12.5 g?
100,000 years
200,000 years
50,000 years
300,000 years
Answer:
300,000 years
Explanation:
100g=0 years
50g=100,00 years
25g=200,00 years
12.5g=300,000 years
Which of these items found on a food label IS NOT a food?
Calories
Sugar
Proteins
Total fats
Answer:
the first one Calories
How many molecules make up 0.051 moles of Potassium chloride (KCl)?
Answer: ???? molecules KCl (no rounding; remember to use scientific notation when necessary)
Answer:
3.0702 × 10²² moleculesExplanation:
The number of molecules potassium chloride can be found by using the formula
N = n × Lwhere n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
N = 0.051 × 6.02 × 10²³
We have the final answer as
3.0702 × 10²² moleculesHope this helps you
What do these floors represent?
Explanation:
What type of floor. You have uploaded no image
Just need help with these 2 problems
Answer:
All of the above
A person lifts up a box from the ground and places it on a shelf
Explanation:
Work done is the force applied on a body to move it through a particular distance or to cause displacement.
In describing work done:Force applied which is the push or pull on a body is very important
Distance or displacement which is the resultant length of path traveled by the body is key.
Work done = force x distance moved in the direction of the force
A person lifting a box is doing work.
67. What is an atomic nucleus? (1 point)
the outer part of an atom in which electrons move
the outer part of an atom in which neutrons move
the central part of an atom, composed of protons and neutrons
the central part of an atom, composed of protons and electrons
Answer:
Explanation:
the central part of an atom, composed of protons and neutrons
Answerhi
Explanation:
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16. If you have 12.04 * 1023 molecules of carbon, how many moles of carbon do you
have?
Answer:
2 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{12.04 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{12.04}{6.02} \\ [/tex]
We have the final answer as
2 molesHope you this helps you
How are chemicals used to produce colors in fireworks?
Answer:
The colors are produced by heating metal salts, such as calcium chloride or sodium nitrate, that emit characteristic colors. List of colors and elements in Fireworks: Aluminum – Aluminum is used to produce silver and white flames and sparks.
Peter weighs 100 pounds. He ran up a 6 foot hill in 2 seconds. What was Peter's power output?
A. 1,200 ft-lbs./sec
B. 600 ft-lbs./sec
C. 300 ft-lbs./sec
D. 100 ft-lb/sec
Answer:
300lb-ft/secs
Explanation:
Given parameters:
Weight of Peter = 100lb
Height of hill = 6ft
Time taken = 2s
Unknown:
Power output of Peter = ?
Solution:
Power is the rate at which work is being done. It is expressed as;
Power = [tex]\frac{Work done }{time taken}[/tex]
Work done = force x distance = weight x height = 100lb x 6ft
Work done = 600lb-ft
Power = [tex]\frac{600}{2}[/tex] = 300lb-ft/secs
Answer:
Answer option C: 300ft-lbs/sec is your answer
Explain what an air mass is?
An
yedsdfsdfdsfsdfsd f sdf ssdf sdfsdf sd fsdf sd
Explanation:
Answer:
A body of air with horizontally uniform temperature, humidity, and pressure.
Explanation:
hope this helped :)
Electromagnetic waves are used in many technological devices. Describe two examples of how energy from electromagnetic waves is used in technologies to do work. Include at least one wave property that is important for each example.
Answer:
Electromagnetic waves are ubiquitous in nature (i.e., light) and used in modern technology—AM and FM radio, cordless and cellular phones, garage door openers, wireless networks, radar, microwave ovens, etc. These and many more such devices use electromagnetic waves to transmit data and signals.
Explanation:
i mean there's alot of stuff that have Electromagnetic waves in it i mean alot!
The two examples of how energy from electromagnetic waves is used in technologies to do work are (i) For communication and radar radio waves are used. (ii) For cooking our food microwaves are used.
What is Electromagnetic Wave ?Electromagnetic waves are also called as EM waves are waves that are composed of vibrations between a magnetic field and an electric field. Electromagnetic wave are represented by a sinusoidal graph.
How energy from electromagnetic wave used in technological applications ?For communication and radar radio waves are used. For cooking our food microwaves are used. Infrared waves are used in remote controls. Mobile phones send microwave signals by the atmosphere.
Thus from the above conclusion we can say that The two examples of how energy from electromagnetic waves is used in technologies to do work are (i) For communication and radar radio waves are used. (ii) For cooking our food microwaves are used.
Learn more about the Electromagnetic waves here: https://brainly.com/question/25847009
#SPJ2
what bond is a sea of free flowing electrons
Answer:
metallic bonds
Explanation:
in metallic bonds, the valence electrons from the s and p orbitals of the interacting metal atoms delocalize. That is to say, instead of orbiting their respective metal atoms, they form a “sea” of electrons that surrounds the positively charged atomic nuclei of the interacting metal ions.
Mark me brainlyist?
The burning gases of the sun are matter in the gaseous state, whereas the ground you walk on is matter in the ___________state.
Answer:plasma
Explanation:
Please help solve this question correctly, thanks :)
Answer: what question?
Explanation:
Answer:
theirs no question
Explanation:
no question or picture
=
1.10
Which procedure involves a physical change in one of the substances?
O creating salt by reacting sodium metal and chlorine gas
O grinding chalk into a fine powder
o building a model rocket propelled by mixing baking soda and vinegar
O allowing a nail to rust
Answer:
Grinidng chalk into a fine powder
Explanation:
20 PTS!!! Jack said that unprocessed oil is a mixture of many organic compounds. Jane said that unprocessed oil needs to be processed so that individual compound can be isolated. Who made the correct statement and why?
1. Jack is correct, unprocessed oil is a mixture of many organic compounds. Jane is not correct, they do not need to be processed to be used.
2. Jack is incorrect, unprocessed oil is not a mixture of many organic compounds. Jane is correct, unprocessed oil needs to be processed to be used.
3. Both Jack and Jane are correct. Unprocessed oil, petroleum, is a mixture of organic compounds that need to be isolated or separated to be used.
4. Neither Jack nor Jane are correct. Unprocessed oil, petroleum, is not a mixture of organic compounds and it does not need to be isolated or separated to be used.
Answer:
Explanation:
i am thinking 3 and 2 but i am gonna say it is 2
98.654321%
Answer:
Both Jack and Jane are correct. Unprocessed oil, petroleum, is a mixture of organic compounds that need to be isolated or separated to be used.
Explanation:
how many electrons does Na have
Answer: 11 electrons
Explanation: The atomic number of sodium is 11. This tells us that sodium has 11 protons and because it is neutral it has 11 electrons.
Determine between what two integers the square root of a number is (M7NS-Ig-2
Answer:
yyhhyvffcfcrfrcfcrfrfrfrc
A part of the periodic table is shown
11
Na
19
K
37
Rb
12
Mg
20
Ca
38
Sr
Which of the following elements has the highest atomic mass (amu)?
a Sodium (Na)
b Calcium (Ca)
c Strontium (Sr)
d Potassium (K)
Answer:
c
Explanation:
effective nuclear charge of Ga
