Answer:
it sucks up stuff,cleans around the house,and can be emptied
Explanation:
because its what it is spose to do
Answer:
a space entirely devoid of matter.
Explanation:
Why do electrons gain energy?
Electrons can gain the energy it needs by absorbing light. If the electron jumps from the second energy level down to the first energy level, it must give off some energy by emitting light. The atom absorbs or emits light in discrete packets called photons, and each photon has a definite energy.
☁️My Answer☁️:
Atomic electrons lose / gain energy when transferring from one orbital to another and hence emitting / absorbing a photon. Free electrons (by which I mean electrons that are not part of an atom) lose or gain energy by scattering inelastic ally with atoms or molecules. In this case, energy is transferred to / from the atom or molecule from / to the electron in the form of kinetic energy
Which of the following characterizes the nucleus of every atom?
1. It has a positive charge
2. It is very dense
3. It is composed of protons, neutrons and electrons
a
I and II only
b
I, II and III
c
I and III only
d
II and III only
An unknown element is found to have three naturally occurring isotopes with atomic masses of 34.9689 (76.000%), 36.9659 (23.988%) and 35.9683 (0.012%) Which of the following is the unknown element?
Answer:
Chlorine (35.44 amu)
Explanation:
An unknown element is found to have three naturally occurring isotopes with atomic masses of 34.9689 (76.000%), 36.9659 (23.988%) and 35.9683 (0.012%).
We need to find the mass of the unknown element. When abundances is given, then atomic mass is given by :
[tex]M=34.9689 (76.000\%)+36.9659 (23.988\%) +35.9683(0.012\%)\\\\=34.9689 (\dfrac{76}{100})+36.9659 (\dfrac{23.988}{100}) +35.9683(\dfrac{0.012}{100})\\\\=35.44\ \text{amu}[/tex]
So, the atomic mass of the unknown element is 35.44 amu and it is chlorine.
what would decreased the resistance of wires an electric current
Answer:Thicker wires have a larger cross-section that increases the surface area with which electrons can flow unimpeded.
Explanation:I really do not know
If the mass of the Crown is 505431 mg, and volume is 44 mL, what is the density of the Crown? Was the Crown solid gold? (the density of gold is 19.3 g per cubic centimetre.)
Answer:
11.49g/cm³
The crown is not gold
Explanation:
Given parameters:
Mass of crown = 505431mg = 505.431g
Volume of crown = 44mL = 44cm³
Unknown:
density of the crown = ?
Solution:
Density is the mass per unit volume of a substance.
Density = [tex]\frac{mass}{volume}[/tex]
insert the parameters and solve;
Density = [tex]\frac{505.431g}{44 }[/tex] = 11.49g/cm³
The density of gold is 19.3g/cm³.
The crown is not gold
Sorry it’s for science
Answer:
A
Explanation:
Density/Formula
\rho ={\frac {m}{V}}
\rho = density
m = mass
V = volume
What happens to the atomic radius when an electron is lost?
A. The positive ionic radius is the same size as the neutral atomic
radius.
B. The positive ionic radius is larger than the neutral atomic radius.
C. The positive ionic radius does not follow a trend with the neutral
radius.
D. The positive ionic radius is smaller than the neutral atomic radius.
9th grade...Chemistry help needed
Answer:
1). Scientific
2). Plating the diluted bacteria on media that supports the growth of only living micro organisms. Statistically accurate.
plzzzzzz help me I will mark u brainiest
Brainless answer:
I think it is ionic.. I am not sure
A genetic mutation is always observable in an organism physical appearance True or false
Answer:
false
Explanation:
false, only a small percentage of mutations cause genetic disorders—most have no impact on health or development. For example, some mutations alter a gene's DNA sequence but do not change the function of the protein made by the gene.
Elements in Group 17 form which ion?
A. 1
B. +1
C. -1
D. 0
Answer:
Elements in group 17 form C. -1 ions
In an ionic bond
A. Two metals can bond together to form a compound
B. Two anions can bond together to form a compound
C. A cation and an anion can bond together to form a compound
Which of these structures is least in danger of chemical weathering?
a bridge made of iron rods
a pile of tiles made of feldspar
a bench made of composite plastic
a statue made of marble
Answer: a bench made of composite plastic
Explanation:
The chemical weathering can be defined as the process in which a chemical causes the degradation and decomposition of the rocks into small particles. The iron rods, feldspar, and marble will weather considerably with a greater danger as the have a strong solid body. But plastic when exposed to a chemical agent usually melts and thus there is least or no danger of chemical weathering of plastic.
why light sometimes changed a material and sometimes doesn’t?
Answer:
When light falls on a material, the energy in its photons can affect the atoms in the material. In some materials, such as metal, the atoms absorb some of the photons so light does not pass through them. In other materials, such as glass, the atoms cannot absorb the photons and light passes through them.
Explanation:
Hope this is good
Explain what happened to the valence electrons in each atom.
Answer:
the happen is a fraction of valence is a compalation of the electrons
Explanation:
yan yung answer ko sana makatulong
In a science experiment 50 grams of salt are placed in a metal pan and are dissolved in 100 mL of water. The water is heated for 3 minutes. What is most likely happening in the pan when the water reaches 100°C?
A. The water will have all evaporated.
B. The water will no longer contain salt.
C. The water will be boiling.
D. The water will be cool enough to pour into a beaker.
Answer:
The water will be boiling
Explanation:
When water reaches 100⁰C the water will be boiling.
PLS HELP THIS IS TIMED
Describe how heat is transferred when you touch a piece of metal (that feels cool but is room temperature) with your finger. Use complete sentences and use the terms kinetic energy, collide, and conduct/conduction
Answer:
Explanation:
Conduction is the transfer of heat through stationary matter by physical contact. (The matter is stationary on a macroscopic scale—we know there is thermal motion of the atoms and molecules at any temperature above absolute zero.) Heat transferred from an electric stove to the bottom of a pot is an example of conduction.
Some materials conduct thermal energy faster than others. For example, the pillow in your room may the same temperature as the metal doorknob, but the doorknob feels cooler to the touch. In general, good conductors of electricity (metals like copper, aluminum, gold, and silver) are also good heat conductors, whereas insulators of electricity (wood, plastic, and rubber) are poor he
!!please help asap ty only if you can ty!!!
2. How many atoms of zinc are present in 0.48 mol of zinc?
(show solution)
Answer:
2.89× 10²³ atom of Zn
Explanation:
Given data:
Number of moles of Zn = 0.48 mol
Number of atoms of Zn = ?
Solution:
Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atom
0.48 mol × 6.022 × 10²³ atom / 1mol
2.89× 10²³ atom
the law of conservation in mass
plz help me and fast
Answer:1.atoms give one or more electrons with each other to form the bond
2. Each atom is left with a complete outer shell
3. A covalent bond forms between two
nonmetals
Explanation:
Seawater is salty and has the ability to rot metal and wood.
True
False
Answer:
maybe it is true
Explanation:
it can 5×then the normal one
A scientist was studying layers of earth in the side of a mountain. In the lower layers, she found fossils of reindeer and polar bears. In the upper layers, she found fossils of coyotes and squirrels. Which conclusion most likely explains the different fossils?
Group of answer choices
The climate was very cold in earlier time periods and became warmer in later time periods
The climate was very hot in earlier time periods and became colder in later time periods.
The climate was wet in earlier time periods and became drier in later time periods.
The climate was dry in earlier time periods and became wetter in later time periods.
Answer:
The climate was very hot in earlier time periods and became colder in later time periods.
Explanation:
I believe it is B.
The earlier days in the earth was of very cold and it is believed to be an ice planet where animals adapted to cold climate was more. Hence, option 1 is correct.
What is climate?The long time pattern of weather in an area is called climate. Climate changes with time and region to region. The different climates in earth is influenced by sun.
Different regions on earth experience different climate due to the varying distance from sun, and other factors such as air quality, presence of mountains, sea, etc.
Earlier days of earth was very much cold and it was known as ice age. This climate was because of the reduced temperature . Thus animals adapted to cold climate was there. Later earth changed to greenhouse period where the heat gradually increased and set into current state.
The fossils of earlier animals was deposited in the lower layer and that of continued age is upper layer. Hence, option 1 is correct. Where the earlier life was of cold climate.
To find more on fossils, refer here:
https://brainly.com/question/6867325
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can anyone do this. i dont get it
A sample of an element has a volume of 78.0 mL and a density of 1.85 g/mL. What is the mass in grams of the sample?
Hey there!:
density = 1.85 g/mL
volume = 78.0 mL
Mass = ??
therefore:
D = m / V
1.85 = m / 78.0
m = 1.85 x 78.0
m = 144.3 grams
Hope this helps!
Please help me with this thank you !!
The pH scale expresses the
concentration of hydroxide
concentration of hydrogen ion
concentration of electrons
Answer:
Hydrogen ions
Explanation:
Answer:
concentration of hydrogen ion
Explanation:
How many molecules do you have in 64 g of CO2?
Answer:
8.757 x 10^23 molecules
Explanation:
Use Avogadro's number of 6.022 × 10 ^23 molecules per mole.
64g CO2/44.01 g/mol = 1.454 moles of CO2
1.454 x 6.022 × 10 ^23 =
8.757 x 10^23 molecules
Which scientific phenomena strengthen wegener's theory?
can someone help me please?
Why can’t you see individual atoms without special tools?
Answer:
Even the most powerful light-focusing microscopes can't visualise single atoms. What makes an object visible is the way it deflects visible light waves. Atoms are so much smaller than the wavelength of visible light that the two don't really interact. To put it another way, atoms are invisible to light itself.
Explanation:
Can you give me Brainliest pls
And Your welcome :)
Answer:
The atoms are too small to see.
Explanation:
Hope my answer helped you!!
what is the number of atoms in 1 mole of carbondioxide??
Answer:
6.02×10 to be tge power 23
