Answer:
Should be Mercury.
Explanation:
The atmospheres of the terrestrial planets range from thin to thick. Mercury has almost no atmosphere.
the energy of motion is called
Answer:I think it’s mechanical energy
Explanation:
indicate whether the statement is true or false a change of state is a chemical change because ice and water do not resemble one another
Answer:
False. Chemical changes are always physical changes
Answer:
False
Explanation:
How does the mass of an electron compare to the mass of a proton and a
neutron?
A. The mass of an electron is much greater than the mass of a
proton or a neutron.
B. The mass of an electron is greater than the mass of a proton but
less than the mass of a neutron.
C. The mass of an electron is much less than the mass of a proton or
a neutron.
D. The mass of an electron is greater than the mass of a neutron but
less than the mass of a proton.
Answer:
C. The mass of an electron is much less than the mass of a proton or
a neutron.
Explanation:
When we compare the mass of an electron to that of proton or neutron, the mass of an electron is much less than the mass of a proton or a neutron.
Electrons are negatively charged particles in an atom
Protons are positively charged particles
Neutrons do not carry any charges.
The relative mass of an electron compared to that of a proton is [tex]\frac{1}{1840}[/tex] This is a very small valueElectrons generally have mass of 9.11 x 10⁻³¹kgProtons weigh 1.67 x 10⁻²⁷kgNeutrons weigh 1.68 x 10⁻²⁷kgWe can see that electrons have very small mass and this is why when calculating the mass of an atom, we use the sum of the number of protons and neutrons.
21. Which of the following statements is true about ions?
a. Cations form when an atom gains electrons
b. Cations form when an atom loses electrons
C. Anions form when an atom gains protons
d. Anions form when an atom loses protons
I think its B cause...
When an atom loses an electron, it becomes a cation (positive ion). When an atom gains an electron, it becomes an anion. Ions are created when an atom loses or gains an electron. Atoms can never lose or gain protons, as this would change the fundamental identity of the atom.
if I'm wrong...please don't attack me
The cations are formed when an atom loses electrons.
• The positive ions produced by the loss of one or more electrons are known as the cations.
• The most commonly formed cations take place in the case of the elements, which involve the loss of all the valence electrons.
• The resulting cation exhibits the electronic configuration of the noble gas atom.
• The negative ions produced from the gain of one or more electrons are known as the anions.
Thus, the correct answer is option b, that is, the cations form when an atom loses electrons.
To know more about:
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In an ionic compound, the size of the ions affects the internuclear distance (the distance between the centers of adjacent ions), which affects lattice energy (a measure of the attractive force holding those ions together). Based on ion sizes, arrange these compounds by their expected lattice energy. Note that many sources define lattice energies as negative values. Please arrange by magnitude and ignore the sign. ∣∣lattice energy∣∣=absolute value of the lattice energy Na2S, K2S Cs2S Li2S
Answer:
Li2S> Na2S> K2S> CsS
Explanation:
The lattice energy of ionic species depends on the relative sizes of ions in the ionic compounds. As the size of ions increases, the lattice energy decreases and vice versa.
When the size of the anions are the same, the lattice energy now depends on the relative sizes of the cations. Therefore, since all the compounds are sulphides and the order of magnitude of ionic sizes is: Li^+ < Na^+ < K^+ < Cs^+.
Therefore, the order of decrease in lattice energy is; Li2S> Na2S> K2S> CsS
~~20 points~~ What is the mass number of an element which has 43 protons, 46 neutrons, and 43 electrons?
a. 132
b. 3
c. 86
d. 83706
e. 89
f. -46
g. there is not enough information given to correctly answer the question
Answer:
e. 89
Explanation:
The mass number is the number of protons and neutrons in an atom. It doesn't include electrons.
43 + 46 = 89
What are atoms made up of
They're made up of three main parts: protons, neutrons and electrons. Think of the protons and neutrons as together forming a “sun”, or nucleus, at the centre of the system. The electrons orbit this nucleus, like planets. If atoms are impossibly small, these subatomic particles are even more so.
2. An object has a mass of 10 grams and a volume of 5 cm3. What is the density of the object?
Answer:
The answer is 2 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
We have
[tex]density = \frac{10}{5} \\ [/tex]
We have the final answer as
2 g/cm³Hope this helps you
Which of the following resources carries a high potential for environmental damage
A:wind
B:trees
C:geothermal
D:nuclear
Answer:
Nuclear
Explanation:
Nuclear is a un-natural and newer type of energy source that can spread lethal toxins into the air causing living things to die. On top of that is it sometimes very unstable and sometimes if it's not disposed correctly it can cause high levels of radiation.
Which of the following is an example of a compound?
Group of answer choices
H2
O
H2O
Na
Answer:
H2O is a compound because its a main constitute of earths hydrosphere
Changes in which two characteristics can indicate a physical change?
Answer:
Physical changes involve states of matter and energy.
Explanation:
No new substance is created during a physical change, although the matter takes a different form. The size, shape, and color of matter may change. Physical changes occur when substances are mixed but don't chemically react.
The characteristics that can be changed in the physical change has been shape or size of the compound.
Change in the element has been classified as chemical and physical change. The chemical change has been given as the change in the chemical composition of the elements.
The physical change has been the change in the state and form of the element, that has been reversible.
The characteristics that can be changed in the physical change has been shape or size of the compound.
For more information about the physical change, refer to the link:
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Please answer fast!
Where in an atom are protons located?
A.
in the nucleus
B.
in areas of probability
C.
in orbitals
D.
in the photons
Explanation:
they are located in the neucleus
Answer: they are located in the neucleus
Explanation:
Why is the nucleus of an atom positively charged?
Answer:
The nucleus has an overall positive charge as it contains the protons. Every atom has no overall charge (neutral). This is because they contain equal numbers of positive protons and negative electrons. These opposite charges cancel each other out making the atom neutral.
can someone plz help me with this question its hard ASAP
Answer:
d
Explanation:
!DUE SOON PLEASE HELP!
Classify the chemical equations as being balanced or not balanced.
CaO + 3C → CaC2 + CO
Na + H2O → 2NaOH + H2
4Fe + O2 → 2Fe2O3
2Mg + O2 → 2MgO
Answer:
balanced;
unbalanced;
unbalanced;
balanced;
Explanation:
CaO + 3C → CaC2 + CO //all elements are balanced
Na + H2O → 2NaOH + H2 //Na is not balanced on the left
4Fe + O2 → 2Fe2O3 //O is not balanced on the left
2Mg + O2 → 2MgO //left is equal to right, balanced
How do physical changes and chemical changes differ and how are they alike please at least 5 provide examples each for a brainliest!
Answer:
Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.
How are physical and chemical changes similar and different? (compare and contrast) (Physical and chemical changes are similar because matter experiences a change in state, Physical changes are different because matter remains the same substance, just in a different state, whereas chemical changes change the matter
Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding. Often, physical changes can be undone, if energy is input. The only way to reverse a chemical change is via another chemical changes.
Explanation:
I NEED HELP ASAP PLEASE TO WILL GIVE YOU A BRAINLEST
Answer:
Gravity
Explanation:
According to Newton's Law of Gravity, an object with mass will attract another object with mass.
anyone know this? I'll brainlist u!
Answer:
for the second one i'd go with reflection
Explanation:
The distortion changing the shape of enzyme molecules which occurs at high temperatures is known as
Answer:
denaturing
Explanation:
enzyme denatures in extreme temperature and pH
Answer:
Denaturation
Explanation:
It change the shape of enzyme . It also occur in only high temperatures
can someone help me with this question its confusing
ASAP
Answer:
temperature
Explanation:
5. What is the volume of a sample of metal with a mass of 220 grams and a density of 11 grams per
cubic centimeter?
(1 Point)
a:2420 cubic centimeters
b:231 cubic centimeters
c:20 cubic centimeters
d:0.25 cubic centimeters
pls answer fast
Answer:
The answer is option CExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\ [/tex]
So we have
[tex]volume = \frac{220}{11} \\ [/tex]
We have the final answer as
20 cm³Hope this helps you
Na: 1s22sC2p 3s
C=
D =
E =
Answer:
C = 2
D = 6
E = 1
Explanation:
just took the test :)
The isotope Np-238 has a half life of 2.0 days if 96 grams of it were present on Monday how much will remain six days later
Answer:
12 grams
Explanation:
For any radioactive substance
the amount of substance left after n half life is given by = [tex]x/2^n[/tex]
where x the original amount of substance.
____________________________________________
Half life of isotope Np-238 = 2 days
total no of days = 6
no of half life =total no of days/Half life of isotope Np-238 = 6/2 = 3
thus,
for our problem n = 3
initial amount of Np-238 = 96 grams
thus,
the amount of substance left after 3 half life = 96/2^3 = 96/8 = 12 grams.
Thus, 12 grams will be left after six days.
A neutral atom of nitrogen has electrons in energy level(s):
Select one:
O a. 1 only
O b. 2 only
O c. 1 and 2
O d. 1, 2, and 3
Answer:
c
Explanation:
Nitrogen is in period 2, and has electrons in both 1 and 2.
The electron seeks to go up to energy level n = 2 from level 1, which is the initial energy level. Since the second energy level has more energy than the first, the electron must gain energy to travel from n = 1 to n = 2. A neutral atom of nitrogen has electrons in energy levels are 1 and 2.
What is energy level ?Any discrete value from a set of total energy values for a subatomic particle constrained by a force to a finite space or for a system of such particles, such as an atom or a nucleus, is referred to as the energy level, also known as the energy state, in physics.
"Energy levels" refer to the areas around the nucleus where an atom's electrons are positioned. The 3-dimensional region around the nucleus where electrons are most likely to be is represented by an energy level.
Every component of the cycle of wellness depends on energy. Our attitude and physical health both get better as we get more energy. Connecting with people, exercising, and feeling driven to work hard and accomplish personal objectives are all more likely.
Thus, option C is correct.
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What is the density of a substance with a mass of 1.8 kg and a volume of 0.2 L?
Hurry Quick for 10 points
giveaway
Answer:
The answer is 9.0 kg/LExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question
mass = 1.8 kg
volume = 0.2 L
We have
[tex]density = \frac{1.8}{0.2} \\ [/tex]
We have the final answer as
9.0 kg/LHope this helps you
Answer:
knkjhhg
Explanation:
According to the kinetic-molecular theory, gas particles, liquid particles, and particles of a solid all experience some type of motion. Which statement best describes the motion of particles of a solid?
Answer:
kinetic energy
Particles in solids are always vibrating (moving back and forth) in place. The vibrational motion of particles in solids is kinetic energy. Heat makes the particles in a solid vibrate faster, giving them more kinetic energy.
Explanation:
The kinetic molecular theory of the states of particles describes the behavior, shape, motion, and observable properties. The particles of solids vibrate in a fixed position. Thus, option D is correct.
What is the kinetic theory?The kinetic-molecular theory was given for the states of matter and to show the movement and composition of the particles of the solids, gases, and liquids. It shows their motion respective to the phases and effects of various factors.
In kinetic-molecular theory, the solid particles are explained based on behavior and motion. It states that the solids have the least amount of kinetic energy in them due to their dense packaging. The solids are fixed in a place and show the back-and-forth vibration that is possible due to the least distance.
Therefore, option. the solid particles only vibrate at a fixed location.
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Your question is incomplete, but most probably your full question was, According to the kinetic-molecular theory, gas particles, liquid particles, and particles of a solid all experience some type of motion. Which statement best describes the motion of particles of a solid?
A. They are motionless and in fixed positions.
B. They move slower and are farther apart than the particles of a liquid.
C. They are in greater disorder than the particles of a liquid.
D. They vibrate about fixed points.
What is the proper nuclear symbol for the the isotope that has 47 protons, 61 neutrons, and 46 electrons?
Which of the following is a homogeneous mixture .example sea water, muddy water, chalk water and oily water
Answer:
sea water
Explanation:
A tennis ball is moving at a speed of 96.0 miles per hour. Which of the
following is the speed of the ball in meters per second?
Answer:
42.9158 m/s
Explanation:
the answer is there above
.
In what way is kinetic energy present in a solar oven
