Answer:
In the periodic table of the elements, it is expected to be an s-block element, an alkali metal, and the first element in the eighth period. It is the lightest element that has not yet been synthesized.
...
1. The brains of the cell is the
O Cell membrane
O Cytoplasm
Nucleus
Mitochondria
HELP FAST 10 POINTS
Steel wool is mostly made of iron. It is a very fine material used as an abrasive. This material oxidizes (rusts) readily in the presence of water and oxygen. Iron nails rust as well. How would the rate of rusting of a piece of steel wool compare with that of an iron nail? Defend your answer.
HELP 10 POINTS
Steel wool rusts faster because more Surface Area is exposed in a steel wool compared to the iron nail and more surface area means faster rusting rates
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Help with this please I’m really bad at this I will mark brainlist
Answer:
5 gsk
Alei
Explanation:
Bonjour comment tu
What do comets and asteroids have in common?
Choices:
They are made of ice
They orbit the sun
They are made of metal debris
They are the center of the solar system
Answer:
They both orbit the sun
Explanation:
They are both celestial bodies orbiting our Sun.
Which of the following is NOT a property of ionic compounds
Select one:
a.Forms a crystal lattice structure
b.High melting point
c.Elements in the compound shares electrons
d.Conducts electric when dissolved in water (electrolyte)
Answer:
c.Elements in the compound shares electrons
Explanation:
Because in ionic compounds element lose or gain electrons only
Sharing of electrons is the property of covlant compounds.
7. Reina is making museum exhibits about two different rock types. How could energy have played a role in the different rock types forming?
Answer:
Energy from different sources leads to different types of rock. Energy inside Earth melts rock into liquid rock, but energy from the sun causes rock to weather into small pieces.
Explanation:
Different sources of energy are required in the formation of rocks. A source of energy like the sun is vital in the facilitation of processes pertaining to rock formation that occur on the surface of the earth. Some of these processes include; erosion and weathering.
The internal heat energy from the earth also facilitate rock formation processes that occur at the core of the earth. Some of them include; melting and subduction. So, energy from different sources result to different types of rocks.
what 2x+78
if x is 72
Answer:
222
Explanation:
because
2x + 78 = 222
2 (72) + 78
2 x 72 = 144
144 + 78 = 222
Where x is you multiply what x equals by the number on the left of it
Cobalt-62 is a radionuclide with a half life of 1.5 minutes. What fraction of
an initial sample of cobalt-62 will remain after 6 minutes? Explain your
answer.
Answer:
1/16 is the answer.........
if liquid water ___ energy it will become ice
1 loses
2 gains
3 neither loses nor gains
Answer:
the answer is 1- loses
Explanation:
When water freezes it gives up some of the water's energy.
Which statement describes the relationship between bonding and surface tension?
A. The more ionic bonds a molecule can make, the lower the surface tension.
B. The more ionic bonds a molecule can make, the higher the surface tension.
C. The more hydrogen bonds a molecule can make, the higher the surface tension.
D. The more hydrogen bonds a molecule can make, the lower the surface tension.
Answer:
The more hydrogen bonds a molecule can make, the higher the surface tension.
Explanation:
The more hydrogen bonds a molecule can make, the higher the surface tension. Therefore, this statement best describes the relationship between bonding and surface tension.
What is surface tension?Surface tension exists property of a liquid surface indicated by its acting as if it existed as a stretched elastic membrane. This phenomenon can be regarded in the nearly spherical shape of small drops of liquids and soap bubbles. Because of this property, specific insects can stand on the surface of the water. A razor blade also can be sustained by the surface tension of water. The razor blade exists not floating: if pushed via the surface, it descends via the water.
Hence, The more hydrogen bonds a molecule can make, the higher the surface tension. Thus, this statement best represents the connection between bonding and surface tension.
Therefore, (C) option is the correct answer.
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Is it balanced? How do you know?
Answer:
ok
Explanation:
Answer:
Yes it is balanced
Explanation:
You can check by finding the total of each element on both sides so:
Left Hand Side :
Carbons: 6
Oxygens: 6x2 (carbon dioxide) and 6 (water) so there are 18
Hydrogens: 6x2 (carbon dioxide) so 12
Right Hand Side:
Carbons: 6
Oxygens: 6 (glucose) then 6x2 (oxygen) so there are 18
Hydrogens: 12
How many moles of hydrogen gas(H2) are needed to react with 15 moles of chlorine gas
Answer:
15 moles of hydrogen gas are needed to react with 15 moles of chlorine gas.
Explanation:
The balanced reaction is:
H₂ (g) + Cl₂ (g) → 2 HCl (g)
By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of the compounds participate in the reaction:
H₂: 1 moleCl₂: 1 moleHCl: 2 molesThen you can apply the following rule of three: If 1 mole of Cl₂ reacts with 1 mole of H₂, 15 moles of Cl₂ with how many moles of H₂ does it react?
[tex]moles of H_{2} =\frac{15 moles of Cl_{2} *1mole of H_{2}}{1moles of Cl_{2}}[/tex]
moles of H₂= 15
15 moles of hydrogen gas are needed to react with 15 moles of chlorine gas.
What does Darwin's controversial bookOn the Origin of Species by Means of Natural Selection, illustrate?
Answer:
Darwin's book introduced the scientific theory that populations evolve over the course of generations through a process of natural selection. It presented a body of evidence that the diversity of life arose by common descent through a branching pattern of evolution.
I need this right now please help
Answer:
I hope it helps you
Explanation:
As force will be its Weight hence ,
Force = Weight
Force = m*g
As given ,
m=60kg and g= 9.8 m/sec^2
hence putt the values in above formula we get,
F=60*9.8
F= 588 N
please
Brain-list it or support me at my U-Tube channel " ZK SOFT&GAMING " I will be thankful
F=mg
F = 60 ×9.8
F = 588 N
Explanation:
I hope it's helps you
What is the mass of .89 moles of calcium chloride, used as an ice-melter
Answer:
98.76 g
Explanation:
Use the formula mass=moles x MM :)
The mass of .89 moles of calcium chloride, used as an ice-melter is 98.76g.
What is mass ?A body's mass is an inherent quality. Prior to the discovery of the atom and particle physics, it was widely considered to be tied to the amount of matter in a physical body.
The amount of matter that makes up every object or body is the greatest way to understand mass. Everything that we can see has mass. Examples of objects with mass include a table, a chair, your bed, a football, a glass, and even air. The mass of a thing determines whether it is light or heavy.
Simply put, mass is a measurement of a body's amount of matter. Matter is everything that has both volume and mass. Although mass cannot be seen, it can be measured or quantified.
mass = moles x MM
= 0.89 × 110. 98 g⋅mol
= 98.76 g
Thus, The mass of .89 moles of calcium chloride, used as an ice-melter is 98.76g.
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An isotope of cesium-137 has a half-life of 30 years. If 5.0g of cesium-137 decays over 60 years. How many grams will remain.
Answer:
1.25 gram of cesium-137 will remain.
Explanation:
Given data:
Half life of cesium-137 = 30 year
Mass of cesium-137 = 5.0 g
Mass remain after 60 years = ?
Solution:
Number of half lives passed = Time elapsed / half life
Number of half lives passed = 60 year / 30 year
Number of half lives passed = 2
At time zero = 5.0 g
At first half life = 5.0 g/2 = 2.5 g
At 2nd half life = 2.5 g/ 2 = 1.25 g
Thus. 1.25 gram of cesium-137 will remain.
In an endothermic reaction which bonds are stronger? The reactants or products? Explain
reactants because it had other chemicals, when more are mixed it will be more stronger.
It is the correct answer
Question: People can get HIV if they share
needles to pierce their ears or other body
parts. Why is this true?
Answer:
Because its like wearing someones hat whom they might have lice.
Explanation:
Answer:
Because it may spread through your body quicker than anything else.
Explanation:
Hope this helps ya-Lily
Morocco is separated into different territories of land with tribes often fighting for power to this day.
Answer:
umm whats the question??
Explanation:
Answers please i need hell
Answer:
You said you need Hell
Explanation:
Why is Cesium more reactive than Lithium??? Please help
Answer: Cesium is more reactive toward water than lithium because the ionization energy decreases down the group reactivity increases down the group.
Explanation: Please mark me as brainliest and i hope that helped!
When comparing Potassium (K) and Calcium (Ca) you must compare?
what is the energy transfer from the sun to producers to consumers
Answer:
Energy Flow in an ecosystem
Explanation:
The sun gives energy to a producer then to consumers
What is the percent by mass of Water in CaSO4•2H20?
Answer:
20.93%
Explanation:
The percent by mass (%mass) of water in the following compound can be calculated thus:
%mass of H2O = mass of 2H2O/mass of compound × 100
Where;
Ca = 40
S = 32
O = 16
H = 1
Hence, the molar mass of CaSO4•2H20 = 40 + 32 + 16(4) + 2{ 1(2) + 16}
= 40 + 32 + 64+ 2{18}
= 172g/mol
Molar mass of 2H2O = 2{2 + 16}
2(18)
= 36g/lol
Therefore, the percent by mass of 2H2O in CaSO4•2H20 is as follows:
36/172 × 100
= 0.2093 × 100
= 20.93%
Given the reaction:
2 H2(g) + O2(g) → 2 H2O(l)
What is the total number of liters of O2(g) at STP needed to produce 6.0 × 1023 molecules of H2O(l)?
A) 33.6 L
B) 44.8 L
C) 11.2 L
D) 22.4 L
Answer:
V = 22.34 L
Explanation:
Given data:
Volume of O₂ needed = ?
Temperature and pressure = standard
Number of molecules of water produced = 6.0× 10²³
Solution:
Chemical equation:
2H₂ + O₂ → 2H₂O
Number of moles of water:
1 mole contain 6.022× 10²³ molecules
6.0× 10²³ molecules × 1 mole / 6.022× 10²³ molecules
0.99 mole
Now we will compare the moles of oxygen and water.
H₂O : O₂
2 : 1
0.996 : 0.996
Volume of oxygen needed:
PV = nRT
V = nRT/P
V = 0.996 mol × 0.0821 atm.L/mol.K × 273.15 K / 1 atm
V = 22.34 L
balanced chemical equation for formation of bleaching powder?
Answer:
Ca(OH)2 + Cl2 → CaOCl2 +H2O.
Explanation:
Updated answer
Answer:
this is balanced equation
Cells and the Structure of Life Lab Report
What is the purpose of this lab
Explanation:
Andrews, 4/15/2019 – Cells and Structure of Life Lab Report. Objective(s): In your own words, what was the purpose of the lab? The purpose of this lab was to explain, show, and gather evidence of the cell theory. Procedure: 1.
2021: Cells and Structure of Life Lab Report. Objective(s): In your own words, what was the purpose of the lab? The purpose of this lab was to explain, show, and gather evidence of the cell theory. Procedure: 1.
Pls Help Will give BRAINLIEST
Which of the following is a natural occurrence of electricity?
A. lamp
B. compass
C. lightning
D. stove
Answer:
Explanation:
its the latter C. becuse One of the most fantastic displays of electricity in nature is lightning. Lighting occurs when large amounts of electrostatic energy builds up in clouds from the energy of storms.
With which temperature scale is temperature directly proportional to average kinetic energy? Celsius
Kelvin
centigrade
Fahrenheit
Answer:
The Kelvin temperature scale is the scale that is based on molecular motion and so absolute zero is also called 0K.
Explanation: The Kelvin temperature of a substance is directly proportional to the average kinetic energy of the particles of the substance.
A + B → AB:
AB → A + B:
Hydrocarbon + O2 → CO2 + H2O:
AB + CD → AD + CB:
→ AD + CB:
v
Answer:
A + B → AB:
✔ synthesis
AB → A + B:
✔ decomposition
Hydrocarbon + O2 → CO2 + H2O:
✔ combustion
AB + CD → AD + CB: replacement
Explanation:
