What is a mole in chemistry
Answer:Mole, also spelled mol, in chemistry, a standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles.
Explanation:
Which pair of elements have the same number of atomic orbitals?
A.
Silver and strontium
B.
Sodium and strontium
C.
Silver and sulfur
D.
Sulfur and strontium
Answer:
B I think
Explanation:
Answer:
B, I'm guessing by their characteristics
Which of the following statements about matter at
room temperature is true?
a. A solid has a definite volume, but a liquid's
volume can change.
b. Both a solid and a liquid Have a definite shape.
c. A solid has a definite shape, but a liquid's shape
can change.
d. Both a solid and a liquid have volumes that can
change.
e. A solid's shape can change, but a liquid has a
definite shape.
Answer: D
Explanation: If there was ice, the volume will change, if there was liquid (ex: water), it wouldn’t melt.What is the mass of 4.2 x 10^24 molecules of Ca(OH)2
what is the oxidation number of Pb(NO3)2
Answer:
+2
Explanation:
The nitrate ion is a radical with an overall charge of -1. To get the oxidation number of lead, add up all the oxidation numbers and equate to zero. Therefore the oxidation state of lead is +2.
Answer:
+2
Explanation:
looked it up
Why do we research
before conducting our
experiment?
Without doing research before doing an experiment you’d be at risk, example: Chemical reactions that COULD cause chemicals burning through human skin, or setting off an harmful explosion by mixing unknown chemicals together.
Diana and Kinsey are put in charge of choosing a mascot for their basketball team. There are fifteen players on the team, but Diana and Kinsey survey only the five players on the starting lineup about their favorite mascot.
Which best describes this error in data collection?
The data are inadequate.
The data are false.
The data were recorded incorrectly.
The data cannot be reproduced.
Answer: the data are inadequate .
Explanation:
Leann is learning about chemical reactions. She wants to create a model of a chemical reaction, so she is examining the information that she should include. What are the different components that she should include in her model? Choose the three that apply.
A. the kinds of atoms that form during a reaction
B. the kinds of molecules involved in the reaction
C. the kinds of elements that make up a molecule
D. whether the molecules are products or reactants
E. whether the products have more mass than the reactants
Flood waters
moving soil from
one location to
another
What is it weathering, Erosion or deposition
Answer:
I think the answer is EROSION because it has to do with the movement of sediment.
Explanation:
Hope this helps!
Flood waters moving soil from one location to another is called erosion.
Erosion is the process by which soil, rock, and other materials are transported from one place to another by natural forces such as water, wind, and ice.
In the case of soil being moved by flood waters, the water is the natural force that is causing the erosion. The water is carrying the soil from one location to another, which is a characteristic of erosion. Deposition, on the other hand, is the process by which eroded materials are deposited or laid down in a new location. Deposition occurs when the energy of the transporting medium (such as water or wind) decreases, and the materials being transported are no longer able to be carried.Therefore, the movement of soil from one location to another due to flood waters is an example of erosion.
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what is the heat of reaction H2 + 1/3N2 2/3NH3
What type of energy results from the burning of wood or gasoline?
electric
nuclear
chemical
Answer:Electric
Explanation: Its right.
Chemical energy results from the burning of wood or gasoline. Therefore, option (C) is correct.
What is chemical energy?Chemical energy is described as the energy which is stored in the chemical bonds formed in the chemical compounds. It is liberated during the chemical reaction and produces heat as a side-product which is known as an exothermic reaction.
Examples of chemical energy are biomass, natural gas, batteries, petroleum, and coal. When chemical energy is released from a compound, it is transformed into a completely new substance.
While burning wood or fuel, the chemical energy in the wood or gasoline is liberated as heat because of the chemical reaction of oxygen in the air and wood. This kind of chemical reaction is known as a combustion reaction. Combustion reaction converts the chemical energy stored in the wood into light energy and heat.
Therefore, in the burning of wood or gasoline, chemical energy is emitted.
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How many molecules in a mole?
Answer:
One mole of a substance is equal to 6.022 × 10²³ units of that substance (such as atoms, molecules, or ions). The number 6.022 × 10²³ is known as Avogadro's number or Avogadro's constant.
Explanation:
hope this helped!
coefficient of 3MgCl2?
In a 2.00 g sample, which has the greatest number of atoms?
AI
S
All are equal
Na
Р
Answer
so AI has 13 atoms
S has 16 atoms
Na has 11 atoms
P has has 15 atoms
so the one with the most is S
S is sulfur
sulfur has many uses when it is processed along with some some biological uses.
Explanation:
if two group in the game are exirting equal ad opposite force the rope,will the rope move?
Answer:
No.
Explanation:
If the forces are acting on opposite direction, they will cancel out each other. As a result, the object will not move. This type of force is called balanced force. In this type of force the net force acting on an object is equal to 0. Hence, if two groups in the game are exerting equal and opposite force, the rope will not move.
I NEED HELP! An iron cube is placed in liquid water. Which particles have the higher kinetic energy?
Answer:
Liquid water has higher kinetic energy thn iron cube
Explanation:
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Which property is the least reliable method for identifying a mineral
A. color
B. luster
C. streak
D. cleavage
Answer:
I think it is a color but I'm not completely sure
Answer:
Color
Explanation:
The model represents a
Answer:
i think you forgot to add a picture
Formula for:
* Density: D = M/V?
* Mass: ?
* Volume?
(CHEMISTRY FORMULAS ONLY!!)
calculate the number of molecules in 52 gram of helium
Answer:
The molar mass that is the mass of 6.022 X 1023 atoms of helium is 4g. Hence 1 mole of He = 4 g of He = 6.022 X 1023atoms of He.
1 g of He = (6.022 X 1023) / 4 atoms of He.
52 g of He = (6.022 X 1023X 52 ) / 4 atoms of He.
Explanation:
Water
Specific Heat (J/c "C)
4.184
How much heat is needed to change the temperature of 50.0 g of water to 20.0°C
Answer:
The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object. The direction of the force on the first object is opposite to the direction of the force on the second object. Forces always come in pairs - equal and opposite action-reaction force pairs.
Explanation:
The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object. The direction of the force on the first object is opposite to the direction of the force on the second object. Forces always come in pairs - equal and opposite action-reaction force pairs.
Carbon decays every 5700 years. If you found a rock containing Carbon that has gone through 2.5 half lives, how old is that rock?
Answer:
14,250 years old.
Explanation:
First, multiply the two lifetimes. - 11,400.
Then, divide 5,700 in half for the 0.5 lifetime. - 2,850.
Lastly, add them all up. - 11,400 + 2,850 = 14,250 years old.
sorry if incorrect <3
thats what i understood XD
what happen when two light waves traveling from oppsite direactions meet?
Answer:
When two or more waves meet, they interact with each other. The interaction of waves with other waves is called wave interference. Wave interference may occur when two waves that are traveling in opposite directions meet. The two waves pass through each other, and this affects their amplitude
Explanation:
hope this helps!
Gold atoms can be identified based on the number of which subatomic particles?
A. Protons
B. nuclei
C. electrons
D. neutrons
Answer:B
Explanation:
what is the primary difference between and hypothesis and a theory
A hypothesis, on the other hand, is similar to a theorem, but it stands pretty much on its own and is not known to be linked to other theorems in any way. A hypothesis usually has no compelling reasons to be true or false. Hypotheses can be classified into the following categories:
The degrees of freedom of a theory have not yet been determined. These could be properties of a theory that haven't been fully determined yet. A theory can be expressed in a finite number of ways, and accepting one of them is referred to as "forming a hypothesis." It's about the aspects of a hypothesis that aren't fully formed yet.Once evidence is discovered, a hypothesis may evolve into a theory.A hypothesis that could become a theory if a mathematical formulation can be established.A hypothesis based on common sense and known theories that is not intended to become part of a bigger theory, but rather to explain a single fact. This could include things like beliefs regarding the formation of the earth.A theory derives a large number of predictions from a limited number of theorems or assumptions, which fall into the following categories:
Things we already knew to be true and can be explained by other theories.Things we previously knew to be true, but which no other theory could explain or predict.Things that we didn't know were true but were later confirmed to be true.Things we didn't realize were true, and don't know if they are still true, but don't contradict current measurements.The layer of the Earth called the mantle is often described as convecting. In this context, convection is
Answer:
the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat.
Explanation:
Oxygen gas is produced when hydrogen peroxide reacts with manganese
dioxide. How would you identify the oxygen gas? Name the method/test you
would use and explain the details of your observations to confirm the identity of
the gas.
Answer:
method used is decomposition
Explanation:
Hydrogen Peroxide (H2O2) will decompose rapidly in the presence of Manganese Dioxide, acting as the catalyst, to produce Oxygen gas and water.
When the Hydrogen Peroxide and Manganese Dioxide are mixed, Oxygen gas bubbles should be seen coming from the mixture. One can collect this Oxygen gas produced over water (through water-displacement) and store it inside a bottle for later use.
11. Which element forms an ionic compound when it reacts with lithium?
Test anxiety symptoms can include
a. Shaky hands
b. Sweating
C. Headaches
d. All of these
Please select the best answer from the choices provided
O A
B
С
Answer:
D.) All of the above
Explanation:
Anxiety can cause sweating, chaky hands, headaches etc
Metallic bonds have what that are freely flowing in a sea
Answer:
tRUE
Explanation: