Answer: helium
Explanation: it’s in the very last column (group) and the first row (period)
One of the primary functions of the digestive system is what
Answer:
Breaks down and absorbs nutrients from the food and liquids you consume to use for important things like energy, growth and repairing cells.
dilute hydrochloric acid solid s, gas g
Answer:
It forms weakly acidic carbonic acid and a strong base, sodium hydroxide. -The reaction of hydrochloric acid (HCl) and sodium carbonate (Na2CO3) yields a product of water (H2O), carbon dioxide gas (CO2), and table salt (NaCl).
EFFECTS Of The
HUMAN INTERVATION OF THE
CARBON CYCLE.
Human activities have a tremendous impact on the carbon cycle. Burning fossil fuels, changing land use, and using limestone to make concrete all transfer significant quantities of carbon into the atmosphere. ... This extra carbon dioxide is lowering the ocean's pH, through a process called ocean acidification.
What type of soil is a mixture of coarse clay and rock particles found in northwest Pennsylvania?
Which of the following statement(s) about chemical bonding
are TRUE?
SELECT ALL THAT APPLY
a
Bonding always involves atoms evenly sharing
valence electrons
b
Bonds are permanent attractions that cannot be
broken once formed
с
Bonds are formed by valence electrons of
interacting atoms
d
Bonding occurs to give both atoms a more stable
electron configuration
Bonds are formed by valence electrons of
interacting atoms. That is option C.
Bonding occurs to give both atoms a more stable electron configuration. That is option D.
Chemical bond is defined as the link or attraction that exist between atoms, ions or molecules that usually leads to the formation of new chemical compounds.
There are different types of chemical bonds which include:
Covalent bonding: This bond is formed when the outermost electrons of one element shares it's electrons with the another element.Therefore, bonds are formed by valence electrons of interacting atoms.
ionic bonding: Here, electrons from the outermost shell of one element is transferred to another element to gain stability of the octet rule.Octet rule states that the total number of the electrons in the outermost shell should be equal to eight to maintain a stable electron configuration.
Therefore, bonding occurs to give both atoms more stable electron configuration.
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Answer: c: bonds are formed by Valence electrons or interacting atoms
d: bonding occurs to give both atoms a more stable electron configuration
Explanation:
The sun causes a greenhouse effect on Earth. How is Earth impacted by the greenhouse effect? (1 It allows for oceans to warm up quicker than land. O It is the source of day and night on Earth O It allows for people to inhabit Earth It creates the different seasons that occur on Earth
Answer:
It allows oceanss to warm up
Explanation:
If you dont know what the greenhouse effect is,here is a definition for you. The greenhouse is a time period where the earth goes through changes. This is where the earth traps in gasses. When this happens,the earth produces oxegyn and carbon dioxide. Earth also traps in heat. So i think the answer might be it allows oceans to warm up quickerthan land. also...here is an extra fun fact. Scientist have found the moon is slowly moving away from earth.....i believe alien time....tell me what you think. I love a good debate...c-ya
Suppose a 24.3 mL sample of xenon gas at 25.0°C and 1.01 atm is heated to 50.0°C and
compressed to a volume of 15.2 mL. What will be the pressure of the sample?
Answer:19222.1
Explanation:
UNIT TEST
H electronegativity: 2.2
H valence electrons: 1
C electronegativity: 2.55
C valence electrons: 4
O electronegativity: 3.44
O valence electrons: 6
Chemical weathering over hundreds of thousands of years formed modern caves. One form of chemical weathering occurs when carbon dioxide reacts with water to produce carbonic acid, H2CO3. How many bonds formed in H2CO3?
(1 point)
eight
six
three
five
Answer:
Six
Explanation:
I just took it and that is the correct answer.
Carbonic acid is formed by the reaction of carbon dioxide and water. There are total six bonds in carbonic acid. Four bonds between carbon and oxygen and two bonds between oxygen and hydrogen.
What is carbonic acid?Carbonic acid is an inorganic acid formed by reaction water with carbon dioxide. The structure of carbonic acid H₂CO₃ is drawn in the uploaded image. Where, carbon bonds a double bond with one oxygen.
Carbon has a valency of 4 thus it forms 4 bonds with other atoms. Carbonic acid contains two OH groups where oxygen and hydrogen forms covalent bonds by sharing electron with each other.
The two oxygens in the OH group forms a single bond with carbon. Remaining one oxygen forms double bond with carbon.Thus, there are total 6 bonds formed between atoms. Hence, option b is correct.
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which of the following best describes separator ions?
A: Ions that combine to form a precipitate
B: Ions that do not participate in the reaction
C: Ions made when compounds dissolve in water
D: Ions that are made of a single element
Answer:
A. Ions that combine to form a precipitate
Please please help asap!!!
Answer:
5
Explanation:
1. How do patterns in the rock record provide evidence for the history of earth and life on earth?
Answer:
With a rdio
disck
Explanation:
that are very good at all time and a very high school football game to get a new case
CAN SOMEONE ANSWER ME PLZ I NEED AN ANSWER TO 5 AND 6!!
Answer:
did you use the internet
Explanation:
?????????????
Help me clarify please!
I am calculating the overall mass for an atom. In other words, the whole number. I'll try to go in depth of what I mean.
Let's take a look at Germanium.
Its mass is 72.61.
When calculating the whole number as the overall atomic mass, do I input 72 or 73? Am I required to round at all times?
Answer:
Round to the number of significant figures in the original question. However, if you're going to proceed with further calculations using this mass, it's best not to round, as rounding will cause your answer to be less precise.
Explanation:
How does physics define work?
Answer:
In physics, work is the energy transferred to or from an object via the application of force along a displacement. In its simplest form, it is often represented as the product of force and displacement. A force is said to do positive work if (when applied) it has a component in the direction of the displacement of the point of application.
Explanation:
Hi!!
work, in physics, measure of energy transfer that occurs when an object is moved over a distance by an external force at least part of which is applied in the direction of the displacement
6. Consider the reaction: CzHo (g) + 02 (8) - 4 CO2(g) + 6H2O (1)
(a) Balance the equation.
(b) How many grams of oxygen are required to react with 10 moles of ethane for a complete
combustion reaction?
Answer:
1120 gm
Explanation:
6. Consider the reaction: CzHo (g) + 02 (8) - 4 CO2(g) + 6H2O (1)
(a) Balance the equation.
(b) How many grams of oxygen are required to react with 10 moles of ethane for a complete
combustion reaction?
FIRST, CORRECT THE EQUATION THEN BALANCE
2C2H6(G) + 7O2------------> 4CO2 + 6H2O
so for 10 moles of ethane, we need
7 X 5 = 35 MOLES O2
=35 MOLES O2
O2 HAS A MOLAR MASS OF 2X16 = 32 gm
35 MOLES OF O2 HAS A MASS OF 35 X 32 =1120 gm
ye pls give answer ye
A compound which is an electron pair donor is generally classified as a????? urgent please
Answer:
A Lewis base is defined as any species that can donate a pair of electrons, and a Lewis acid is any species that can accept a pair of electrons. All Brønsted–Lowry bases (proton acceptors), such as OH−, H2O, and NH3, are also electron-pair donors.
1) how many shells are there in the Bohr model of a hydrogen atom?
2) how many valence electrons are there in Fluorine atom?
3) how many shells are there in the Bohr model of a silicone atom?
4) fill in the blanks besides each Bohr model diagram
a) Number of protons:
Number of shells:
Number of electrons:
Number of valence electrons:
b) Number of protons:
Number of shells:
Number of electrons:
Number of valence electrons:
Answer:
a) protons 6
electrons 6
valance electrons 4
shells 2
b) protons 8
electrons 8
valance electrons 6
shells 2
What are 3 balanced chemical equations?
Balanced chemical equation - A chemical equation in which the number of each type of atom is equal on the two sides of the equation. Subscripts - Part of the chemical formulas of the reactants and products that indicate the number of atoms of the preceding element.
Examples of Balancing Chemical Equations
Example 1. C5H12 + O2 ---> CO2 + H2O. ...Example 2. Zn + HCl ---> ZnCl2 + H2 ...Example 3. Ca(OH)2 + H3PO4 ---> Ca3(PO4)2 + H2O. ...Example 4. FeCl3 + NH4OH ---> Fe(OH)3 + NH4Cl. ...Example 5. S8 + F2 ---> SF6 ...Example 6. C2H6 + O2 ---> CO2 + H2O. ...Example 7. Al2(CO3)3 + H3PO4 ---> AlPO4 + CO2 + H2O.A spherical balloon of volume 4.06 103 cm3 contains helium at a pressure of 1.25 105 Pa. How many moles of helium are in the balloon if the average kinetic energy of the helium atoms is 3.60 10-22 J
A chemist titrates of a benzoic acid solution with solution at . Calculate the pH at equivalence. The of benzoic acid is .
When the pressure on a gas increases, will the volume
increase or decrease?
Answer:
20 is the answer
Explanation:
What did you include in your response? Check all that apply.
The placement and organization of the electron changed.
Rutherford’s model identified electrons at a distance from the nucleus.
Bohr’s model identified the electrons at specific energy levels.
The modern atomic model includes the electron cloud
Given:
2C8H18 + 250216CO2 + 18H20
In the combustion of octane, how many grams of oxygen are needed to completely react and produce 84.00 grams of
carbon dioxide? Use the periodic table to get the weights of the elements.
Drag the labels to the correct locations to complete the analysis. Each label can be used more than once.
1 mol
mol
8.
g
g
mol
1 mol
02
44.009
16
95.43
31.998
84.00
CO2
25
Maya made this picture to represent a chemical reaction: There are two overlapping circles on the left, one white and the other with vertical lines. It is labeled ZX. There is a gray circle labeled Y on the right of ZX. There is a plus sign between ZX and Y. An arrow pointing right is shown on the right of the gray circle labeled Y. Two overlapping circles, one white and the other gray are shown on the right of the arrow and is labeled XY. On the right of XY there is a small circle with vertical lines labeled Z. There is a plus sign between XY and Z. Which of the following statements best explains the type of chemical reaction represented by Maya's picture? It is neither a synthesis reaction nor a decomposition reaction because the total mass of the products is less than the total mass of the reactants. It is neither a synthesis reaction nor a decomposition reaction because two reactants form two products. It represents a synthesis reaction because the same atoms are present in the reactants and products. It represents a decomposition reaction because two reactants break apart and form two products.
The reaction can neither be classified as a syntheisis or as a decomposition reaction since two reactants yield two products.
A synthesis reaction is one in which two or more reactants combine to yield only one product. A decomposition reaction is one in which a single product is broken up to yield two or more products.
The reaction as explained in the question is neither a synthesis reaction nor a decomposition reaction because two reactants form two products.
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1. What is the primary composition of the objects that make up the Kuiper Belt?
Frozen rock, silicon, and metals
Frozen methane, ammonia, and water
Frozen iron, silicon, and sediment
Frozen methane, rock, and metals
9
Answer:
Frozen methane, ammonia, and water
Explanation:
The Kuiper Belt is made up of many solar system bodies that orbit around the sun outside Neptune’s orbit. The bodies, including some dwarf planets, are composed primarily of frozen volatile materials such as methane, ammonia, and water.
Kuiper belt is a circular disc in the outer solar system consisting of the remnants of planets. Mostly they are composed of frozen methane, ammonia and water. Thus option B is correct.
What is Kuiper belt?Kuiper belt is circumstellar body existing in the outer space and composed of methane, ammonia and water. It is named after the Dutch chemist Gerard Kuiper.
Kuiper belt is considered as an extension from the solar system from neptune. Around 50 AU from the Sun is where the Kuiper belt's inner, major area stops.
A second region known as the scattered disk overlaps the outer edge of the main Kuiper Belt and extends outward to almost 1,000 AU, with some planets on orbits that extend much beyond.
Unlike other rocks, Kuiper belts are made of frozen methane, ammonia and water. Thus option B is correct.
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HELP ME OUT PLEASE!!!!!
The coefficient in the formula above tells us there are:
A) eight Carbon atoms
B) 18 Hydrogen atoms
C) 2 molecules of octane
D) 28 total atoms
Answer:
the correct answer is c two molecules of octane
Kinetic energy caused by moving electrons
Answer:
Electrical energy
Explanation:
Electrical energy is caused by moving electric charges called electrons.
What mass of silver chloride can be prepared by the reaction of 120.0 mL of 0.16 M silver nitrate with 120.0 mL of 0.22 M calcium chloride
The mass of silver chloride, AgCl, that can be produced from the reaction is 2.76 g
We'll begin by calculating the number of mole of silver nitrate, AgNO₃ and calcium chloride, CaCl₂ in the solution.
For AgNO₃:Volume = 120.0 mL = 120 / 1000 = 0.12 L
Molarity = 0.16 M
Mole of AgNO₃ =?Mole = Molarity x Volume
Mole of AgNO₃ = 0.16 × 0.12
Mole of AgNO₃ = 0.0192 moleFor CaCl₂:Volume = 120.0 mL = 120 / 1000 = 0.12 L
Molarity = 0.22 M
Mole of CaCl₂ =?Mole = Molarity x Volume
Mole of CaCl₂ = 0.22 × 0.12
Mole of CaCl₂ = 0.0264 mole Next, we shall determine the limiting reactant2AgNO₃ + CaCl₂ —> 2AlCl + Ca(NO₃)₂
From the balanced equation above,
2 moles of AgNO₃ reacted with 1 mole of CaCl₂.
Therefore,
0.0192 mole of AgNO₃ will react with = 0.0192 / 2 = 0.0096 mole of CaCl₂
From the calculation made above, we can see that only 0.0096 mole of CaCl₂ out of 0.0264 mole given, is needed to react completely with 0.0192 mole of AgNO₃.
Therefore, AgNO₃ is the limiting reactant and CaCl₂ is the excess reactant.
Next, we shall determine the number of mole of AgCl produced from the reaction using the limiting reactant.2AgNO₃ + CaCl₂ —> 2AlCl + Ca(NO₃)₂
From the balanced equation above,
2 moles of AgNO₃ reacted to produce 2 moles of AlCl.
Therefore,
0.0192 mole of AgNO₃ will also react to produce = 0.0192 mole of AgCl
Finally, we shall determine the mass of AgCl produced from the reactionMole of AgCl = 0.0192 mole
Molar mass of AgCl = 108 + 35.5 = 143.5 g/mol
Mass of AgCl =?Mass = mole × molar mass
Mass of AgCl = 0.0192 × 143.5
Mass of AgCl = 2.76 gThus, the mass of AgCl produced from the reaction is 2.76 g
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How many C atoms are there in a 46.2 gram sample of C?
