Answer: The answer is C. The reaction system absorbs 22 kJ of energy from the surroundings.
Explanation: I just took the quiz and it said I got it right.
As per the law of conservation of energy:
C. The reaction system absorbs 22 kJ of energy from the surroundings
Law of conservation of energy:This law of energy states that the energy remains conserved its neither created nor destroyed. It remains conserved throughout the reaction.
when an amount of heat gets absorbed during the reaction from the surroundings this type of reaction is known as an endothermic reaction.
So, for fulfilling law of conservation, same amount of energy must be asborbed.
Thus, option C is correct.
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When elements form bonds, it changes their ______ properties.
The answer is..?
Answer:
chemical and physical
When elements form bonds, it changes their chemical and physical properties.
What is element ?A chemical element is a species of atoms, including the pure material made entirely of that species, that have a specific number of protons in their nuclei. Chemical elements, in contrast to chemical compounds, cannot be reduced by any chemical process into simpler molecules.
A material that cannot be further decomposed by any chemical reaction is known as a chemical element. Each element's atom has a specific number of protons.
For instance, a carbon atom has six protons compared to the one proton in a hydrogen atom. Ions are created by changing the number of electrons in an element's atom.
Thus, When elements form bonds, it changes their chemical and physical properties.
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Which of the following groups of subjects are categorized under natural science?
a.
Geography, History and Civics
b.
Biology, Chemistry and Physics
c.
Chemistry, Mathematics and Civics
d.
Civics, Mathematics and Physics
Answer:
i guess b is the answer.hope it will help
what is the mass number of a carbon isotope with 10 neutrons
Answer:
16 because carbon atom having usual 6 neutron have a mass number of 12 and that with 7 neutron has mass number of 13
What are three properties of metals?
Help PLZ!!!
Answer:
Luster: Metals are shiny when cut, scratched, or polished.
Malleability: Metals are strong but malleable, which means that they can be easily bent or shaped. ...
Conductivity: Metals are excellent conductors of electricity and heat.
Three properties of metals are:
Good conductors of electricity and heatMalleabilityDuctilityGood conductors of electricity and heat: Metals have a high electrical and thermal conductivity, meaning they allow the flow of electricity and heat through them with ease. This property makes metals valuable in various applications, such as electrical wiring and heat transfer.
Malleability: Metals can be easily shaped and molded into various forms without breaking. They can be hammered, rolled, or pressed into thin sheets without losing their structural integrity. This property allows metals to be used in manufacturing processes and the creation of different products.
Ductility: Metals can be drawn into thin wires without breaking. This property makes them suitable for electrical wiring and cable manufacturing, where flexibility is required.
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Which is a characteristic of colloids?
Answer:
A colloid is a mixture composed of particles in a dispersing medium. A colloid is defined by the size of the particles involved. If the particles in a mixture are on the scale of individual molecules, around 1 nanometer, it is defined as a solution. If the particles are larger than 1,000 nanometers, it is a suspension.
Explanation:
i hope this helps you!
The characteristics of colloids are (i) It is a heterogeneous solution (ii) Two phases are present in this solution (iii) It exhibit Tyndall effect (iv) It also exhibit Brownian movement.
What is Colloids ?Colloids is also called Colloidal system or Colloidal solutions are mixture in which one substance microscopically dispersed insoluble particle is suspended throughout another substance.
What are the characteristics of colloids ?The characteristics of colloids are:
Colloids is a heterogeneous mixture. The colloidal solution is turbid. In colloidal solution two phases are present in the solution. One is dispersed phase and another is dispersion phase. Colloidal solution diffuse slowly. It exhibit Tyndall effect. It exhibit Brownian movement.Thus from the above conclusion we can say that The characteristics of colloids are (i) It is a heterogeneous solution (ii) Two phases are present in this solution (iii) It exhibit Tyndall effect (iv) It also exhibit Brownian movement.
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1. Which of the following lists is correctly arranged in order of increasing size?
A. electron, neutron, nucleus, atom
B. electron, nucleus, neutron, atom
C.atom, electron, neutron, nucleus
D. neutron, electron, nucleus, atom
Answer:
C
Explanation:
The order of increasing size are electron, neutron, nucleus and atom.
The size of electron is the smallest among the given particles which followed by neutron that is bigger in size from electron but smaller than nucleus. Proton and neutron are located in the nucleus of an atom so it is bigger in size than neutron.
Atom is the largest among the given substances in which nucleus is present at the center and electrons are revolving around the nucleus in fixed orbits so we can conclude that electron is the smallest and atom is the largest particle.
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Which of the following best describes where cellular respiration occurs?
Answer:
In every body cell
Explanation:
Answer: in every body cell
Explanation:
What is it called when individual water molecules on the surface of a liquid gain enough motion energy (kinetic energy), they leave the liquid to become a gas.
Answer:that is called Evaporation!
Explanation:
Calculate the number of molecules in 0.5 moles of Sodium sulfate (Na2SO4)?
Answer: ??? molecules Na2SO4 (no rounding; make sure to include scientific notation when necessary)
Answer: The formula mass for sodium sulfate was calculated on page T-9. Referring to those numbers, the formula Na2SO4 means: two moles sodium (45.98 g), one mole is (32.06 g.
Explanation: Your welcome.
How do metals become stable?
Answer:
Atoms of metal elements give away electrons in their reactions to form positive ions. The ions formed have a full outer electron shell, so are very stable.
Explanation:
To become stable, the metal atom wants to get rid of one or more electrons in its outer shell. ... Alternately, an atom that loses electrons becomes a positively charged ion (aka cations). The particles in an ionic compound are held together because there are oppositely charged particles that are attracted to one another.
Which of these is NOT a cation?
A) K+
B) Mg2+
C) NH4+
D) Cl-
Answer:D) Cl-
Explanation:
Only cations are positive (+)
Cations are positively charged ions. Negatively charged ions are called anions. Among the given ions, Cl- is not a cation. It is an anion.
What are ions ?Ions are charged atoms formed by loss or gain of electron by atoms. Atoms with extra electrons or electron deficient will loss or gain electrons in order to achieve octet.
When atoms loss electrons, the number of their protons become dominant and they acquire positive charge. When atoms gain electrons the number of electrons become dominant and atoms become negative charged.
The positive charged ions are called cations and negative charged ions are called anions. For example when potassium K loss one electron, it forms K+ ion. Similarly when Cl gain an electron it forms the anion Cl-.
Therefore, the one which is not cation among the given ions is Cl-.
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A tennis ball is hit into the air with a racket. When is the ball’s kinetic energy the greatest? Ignore air resistance.
A when it leaves the racket
B just before it reaches the ground
C when it reaches its maximum height
D when its kinetic energy and potential energy are equal
E just before it starts falling downward
Answer:
E. just before it reaches the ground.
Explanation:
The "kinetic energy" refers to the energy when an object moves or is in motion. When the ball leaves the racket, it is considered to have a great amount of kinetic energy. However, this decreases as the ball reaches its maximum height, but the potential energy is at its highest. Upon falling down, its kinetic energy increases but its potential energy decreases.
Provided that there's no air resistance, the speed of falling is even faster for the ball because of gravity and nothing is slowing it down, which means it will have a maximum kinetic energy just before it reaches the ground.
how many elements does hydrochloric acid have
Answer:
Hydrogen chloride (HCl), a compound of the elements hydrogen and chlorine, a gas at room temperature and pressure. A solution of the gas in water is called hydrochloric acid.
Explanation:
hoped that helped
What is the density of a rock that has a mass of 555 g and a volume of 101.1 cm?
Answer:
the volume should be in cubic cm so I assumed that you wanted to write the same . then the answer is 5489.07 kg/m^3
Answer:
[tex]\boxed {\boxed {\sf d\approx5.49 \ g/cm^3}}[/tex]
Explanation:
Density can be found by dividing the mass by the volume.
[tex]d=\frac{m}{v}[/tex]
The mass of the rock is 555 grams and the volume is 101.1 cubic centimeters.
[tex]m=555 \ g \\v= 101.1 \ cm^3[/tex]
Substitute the values into the formula.
[tex]d=\frac{555 \ g}{101.1 \ cm^3}[/tex]
Divide.
[tex]d=5.48961424 \ g/cm^3[/tex]
Let's round to the nearest hundredth to make the answer more concise.
The 9 in the thousandth place tells us to round up. In the tenth place, the 8 will become a 9.
[tex]d\approx5.49 \ g/cm^3[/tex]
The density of the rock is about 5.49 grams per cubic centimeter.
Explain three main differences between bacteria and virus.
True or false? IF we start with an acute angle... the pattern is for the 8 angles are.... ao, oa, ao
which outcome resaults when a liquid is heated
Answer:
evaporation
Explanation:
how many atoms are in KCIO3?
5 atoms 1 potassium, 1 chlorine, and 3 oxygens, in total that is five
Answer:
[tex]737.45 \times {10}^{23} [/tex]
hope this will be true...
What is the element Rao (Hint: it's from the periodic table)
Answer:
The table shows element percentages for RaO (radium oxide).
Element %
O 6.61
Ra 93.39
Explanation:
Hope this helps - good luck ^w
How old are the Appalachian Mountains?
Answer:
480 million years old
Explanation:
Answer correctly for a brainlesit!
What is seen as the moon moves from a new moon to a full moon?
a
The amount of light the moon gets stays constant
b
We see more light and then less light
c
The amount of light the moon is receiving decreases
d
The amount of light we see on the moon is increasing
Answer:
The correct answer would be (d)- The amount of light we see on the moon is increasing
Explanation:
If I got this right then please give me brainliest! If not, let me know the correct answer......:)
1. Ozone in Earth’s atmosphere is important because it
A)absorbs harmful pollution.
B)absorbs harmful radiation.
C)helps clouds form.
D)causes rain to fall.
2.
A. a
B. b
C. c
D. d
Answer:
B
Explanation:
help pls i will give 15 point
Group 18 noble gases are relatively inert because *
their s and p orbitals are filled (outer energy level is filled).
they can have either a positive or a negative charge.
their outermost energy level is missing one electron.
they readily form positive ions.
Answer:I believe its A. There noble gasses so there happy with there electron count!
Explanation:
Group 18 noble gases are relatively inert because their s and p orbitals are filled, meaning their outer energy level is filled. Therefore option 1 is correct.
The noble gases, which include elements like helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn), belong to Group 18 (VIII A) of the periodic table.
These elements have a full complement of electrons in their outermost energy level, also known as the valence shell. This outermost energy level is comprised of s and p orbitals.
Having a filled outer energy level makes noble gases highly stable and unreactive. The stability arises from the fact that their electron configurations are complete, meaning they have achieved a configuration similar to the noble gas that precedes them in the periodic table.
Because noble gases have no missing or unpaired electrons in their outer energy levels, they have little tendency to gain, lose, or share electrons with other atoms.
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When 40g of ammonium nitrate explode 14g of nitrogen and 8g of oxygen form. How many grams of water form?
answer and Explanation:
the same amount would have to stay in grams, so if 14 grams of nitrogen is formed, then 8 grams of oxygen, add those two together and you get 22. and that's 22 of the 40 grams used, so 40 su
Can gravity be considered a force?
you will need an
1. claim,
2. evidence,
3. reasoning
what variables affect gravity?
you will need an,
1. claim
2. evidence.
3.reasoning
please help, thank you
Is the following equation balanced or unbalanced?
H2 + O2 + H2O
Answer:
its looks unbalanced too me
Explanation:
What is the amount of heat energy absorbed when 36 grams of ice at -20oC is melted to water at 0oC?
Answer:
Q = 1461.6 J
Explanation:
Given data:
Mass of ice = 36 g
Initial temperature = -20°C
Final temperature = 0°C
Amount of heat absorbed = ?
Solution:
specific heat capacity of ice is 2.03 j/g.°C
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = T2 - T1
ΔT = 0°C - (-20°C)
ΔT = 20°C
Q = 36 g ×2.03 j/g.°C×20°C
Q = 1461.6 J
In a Covalent bond which statement is true
Answer:
correct is A, but it isn't quite right. Only when the electronegativity values of the two atoms are the same will the bond be 100% covalent.
9. When 4.46 moles of ethylene, C2H4, burns in oxygen to give carbon dioxide and
water, how many grams of carbon dioxide are formed?
C2H4 + 3 O2 → 2 H2O + 2 CO2
How many grams of carbon dioxide are formed??
Answer:
4.46 moles of Ethylene will produce 392.48 grams of Carbon dioxide.
Explanation:
The reaction is as follows
C2H4 + 3 O2 → 2 H2O + 2 CO2
For complete combustion of Ethylene 1 mole of ethylene gives 2 moles of Carbon dioxide.
using unitary method
1 C2H4 => 2CO2
4.46 of C2H4 => 2*4.46 CO2
= 8.92 CO2
No of moles = given mass(w) /molar mass(M)
Molar mass of CO2 = 44g
8.92 = W / 44
W = 8.92 * 44
= 392.48g
So 4.46 moles of Ethylene will produce 392.48 grams of Carbon dioxide.
4.46 moles of ethylene burns in oxygen to give 393 g of carbon dioxide and water.
What is combustion?Combustion, or burning, is a high-temperature exothermic redox chemical reaction between a fuel and an oxidant, usually atmospheric oxygen, that produces oxidized, often gaseous products, in a mixture termed as smoke.
Let's consider the reaction for the combustion of ethylene.
C₂H₄ + 3 O₂ → 2 H₂O + 2 CO₂
We can calculate the mass of CO₂ formed by the combustion of 4.46 moles of C₂H₄, considering the following relationships.
The molar ratio of C₂H₄ to CO₂ is 1:2.The molar mass of CO₂ is 44.01 g/mol.4.46 mol C₂H₄ × (2 mol CO₂/1 mol C₂H₄) × (44.01 g CO₂/1 mol CO₂) = 393 g CO₂
4.46 moles of ethylene burns in oxygen to give 393 g of carbon dioxide and water.
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