Answer:
Chemical would be water splitting into just hydrogen and oxygen. Where as a physical change would be if it turned to ice.
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:
!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
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
When liquid water boils the distance between the particles increases
Answer:
If a liquid is heated the particles are given more energy and move faster and faster expanding the liquid.
The distance between the particles increases tremendously the attraction doesn't change.
What occurs to the water particles whilst water boils?
Whilst water is boiled, the heat energy is transferred to the molecules of water, which begin to pass extra quickly. ultimately, the molecules have an excessive amount of power to stay connected as a liquid. while this takes place, they shape gaseous molecules of water vapor, which go with the flow to the floor as bubbles and tour into the air.
Does the space among particles increase when heated?On heating, their kinetic electricity pushes neighboring atoms or molecules other than each different. This pushing of atoms or molecules outcomes in a slightly accelerated distance among molecules and the volume of stable additionally increases.
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is the amount of
matter in an object.
Group of answer
choices
Weight
Volume
Density
Dough
can someone plz help me with this question its hard ASAP
Answer:
d
Explanation:
~~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
How many electrons would Pd have if it had a +2 charge?_ How many electrons would Pd have if it had a +2 charge?
Answer:
80
Explanation:
W know that, the atomic no of lead (Pb) is 82. The no of protons is equal to the atomic no.
No of protons = 82
It has a charge of +2. It means that its lacks 2 electrons. No of electrons is :
e = 82-2
e = 80
Hence, Pd will have 80 electrons now.
can someone help me with this question its confusing
ASAP
Answer:
temperature
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
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.
Which of the following is the correct name for N2S5?
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.
1. A student in lab measures 4.6 grams of copper for an experiment. Upon further analysis he determines that he should have measured out 4.7 grams of copper. What is his percent error?
Answer:
[tex]2.13\%[/tex]
Explanation:
Quantity of copper measured by a student = 4.6 grams
Original quantity of copper = 4.7 grams
Error in measurement = Original quantity of copper - Quantity of copper measured by a student [tex]=4.7-4.6=0.1[/tex] grams
To find the percent error, apply the following formula:
Percent error = (Error in measurement / Original quantity of copper) × 100
[tex]=\frac{0.1}{4.7}(100)=2.13\%[/tex]
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
anyone know this? I'll brainlist u!
Answer:
for the second one i'd go with reflection
Explanation:
What is the definition Of prokaryote and give me a sentence that explain its so definition Adn the sentence
Answer:
Explanation:
Definition of Prokaryote. a single-celled organism (such as bacteria) that lacks a nucleus and cannot be seen with the naked eye. Examples of Prokaryote in a sentence. 1. The scientist studied the prokaryote under the microscope to see if its single-cell would multiply in certain conditions.
Hope this helps!
Prokaryotes are a single celled organism that is microscopic. They do not have a distinct nucleus with a membrane. They don't have other specialized organelles either. They also include bacteria and archaea.
"Prokaryotes are so small you cant see them with the bare human eye!"
[tex]\boxed{I\;hope\;it\;helps!}[/tex]
<3
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:
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
How did Moseley establish a more accurate periodic table?
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.
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.
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.
Significant figures are the digits within the number that help determine
accuracy.
о
True
о
False
Answer:false
Explanation:
Look at the periodic table, Gold, Silver, Sodium, and Aluminum are all what type of element?
Answer:
They are all in Group 11.
Explanation:
Look at the periodic table!
The elements gold, silver, sodium, aluminum are all metals. Gold and silver is transition metals. Sodium is in s block and aluminum is a p block elements in periodic table.
What are metals?Metals are electropositive elements able to conduct electricity and because of the presence of a pool of free electrons.
Metallic elements forms ionic bonds with non-metals. Gold and silver are transition metals or d-block elements. They are highly conducting and silver is a common component in electrical devises.
Aluminum is a p-block element it is in 13th group and sodium is a first group element and is called as an alkali metal. Hence, all the given elements are metals.
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What does the chemical formula CaCl, show about the compound it represents
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:
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
Which statement best describes what happens Which statement best describes a physical change?
Changes can occur to certain chemical properties of the substance, but the overall shape of the substance will remain the same.
Changes can occur to certain physical properties of the substance, but the overall shape of the substance will remain the same.
Changes can occur to physical properties of a substance, but the chemical composition of the substance remains the same.
Changes can occur to chemical properties of a substance, but the chemical composition of the substance remains the same.during a chemical change?
Answer: The third one, changes can occur to physical properties but the chemical composition remains the same.
Explanation: Chemical changes change the chemical composition. Physical changes do not.
Which of the following is a homogeneous mixture .example sea water, muddy water, chalk water and oily water
Answer:
sea water
Explanation:
