Calculate the number of moles in each of the following masses.

1. 0.039 g of palladium
2. 8200 g of iron

Calculate the mass in grams of each of the following amounts:

3. 1.002 mol of chromium
4. 550 mol of aluminum

Calculate the number of atoms in each of the following amounts

5. 17.0 mol of germanium

Answers

Answer 1

Answer:

1. 3.7 * 10^-4 mol Pd

2. 146.8 mol Fe (or 150 mol Fe if sig fig are required)

3. 52.10 g Cr

4. 14839 g Al (or 15000 g Al if sig fig are required)

5. 1.02  * 10^25 atoms Ge

Explanation:


Related Questions

The density of water is 1.00 g/mL. Which substance below can float on water?

Answers

Answer:

ice, air, ducks and fabric

Explanation:

its common sense

which formula is an empirical formula?

Answers

In chemistry, the empirical formula of a chemical compound is the simplest positive integer ratio of atoms present in a compound. A simple example of this concept is that the empirical formula of sulfur monoxide, or SO, would simply be SO, as is the empirical formula of disulfur dioxide, S2O2.

Whoever answers this question first, with the right answer gets brainliest.


How might an entire insect be preserved?


Soft and hard tissues turn the insect into rock.

Tree sap flows over the insect and hardens.

Sediment accumulates over the insect and hardens.

Carbon from the decaying insect leaves a print on a rock.

Answers

Answer:

Tree sap...I think it sounds the best

Answer:

The Answer is B, Tree sap flows over insects and hardens.

Explanation:

like what the other person said above me.

scientists studying squirrels in a forest observed that the squirrel population decrease over a period of five years. which statement is the most likely explanation for the decrease in the population?​

Answers

Answer:

1.An increment of predators

2.unavailability of food resources due to change in climate causing famine

3.Spread of diseases over time that might kill the squirrels

4.An increment of squirrels which caused high competition on food,thus some of them had to migrate

5.Might be fire break out over some time that caused death to some squirrels in the reasoning of the period of time

HELP! HELP!
an element with 5 protons, and 8 electrons has an atomic number of?

Answers

Answer:

Explanation:  15

Which type of bond is salt? a. covalent b. valence c. metallic d. ionic

Answers

Answer:

D. Ionic

Explanation:

It has ionic bonding! Good luck ^^

3. How are the protons held in the
nucleus?
O opposite charges
O strong nuclear force from neutrons
Owhich nuclear wall

Answers

They are help together by the strong nuclear force from neutrons

8.
Blank is the transfer of energy by electromagnetic waves.
Your answer

Answers

electromagnetic radiation.




PLS ANSWER FAST!!! HURRY I NEED THIS ASAP!!
Which statement about chemical reaction rates is true?


The reaction rates cannot change.


The reaction rates can increase.


The reaction rates are always constant.


The reaction rates cannot decrease

Answers

Answer:

The reaction rates cannot charge

Explanation:

Answer:

The answer is B

Explanation:

What is 210 kg - 38 kg rounded to the correct number of significant figures

Answers

Answer:

170kg

Explanation:

The reaction for the combustion of acetylene is shown. Explain why this reaction is a redox reaction by identifying the oxidation numbers that change, what is oxidized, what is reduced, and what happens to the electrons during the reaction. 2C2H2 + 5O2 → 4CO2 + 2H2O

Answers

Answer:

2 C2H2 (g) + 5 O2 (g) → 4 CO2 (g) + 2 H2O (l)

Explanation:

Redox reaction: In this type of reaction, oxidation and reduction reaction occurs simultaneously in same chemical reaction.

2C_2H_2+5O_2\rightarrow 4CO_2 + 2H_2O2C

2

H

2

+5O

2

→4CO

2

+2H

2

O

This reaction is a redox reaction :

Removal of hydrogen or addition of oxygen is termed as oxidation. in above reaction, removal hydrogen from acetylene gives carbon-dioxide.

Removal of oxygen or addition of hydrogen is termed as reduction. in above reaction, removal of one oxygen atom from oxygen molecule with addition of two hydrogen atoms gives water

The oxidation number of carbon in acetylene is -2.

The oxidation number of carbon in carbon-dioxide= +4

Oxidation number of carbon increases after the reaction which means that carbon is getting oxidized.

The oxidation number of oxygen in oxygen gas = 0

The oxidation number of oxygen in water = -2

Oxidation number of oxygen decreases after the reaction which means that oxygen is getting reduced.

The electrons released during oxidation are transferred to the species which are undergoing reduction reaction.

Answer:

Just put this, or something like it:

The oxidation number of carbon changes from -1 to +4.

The oxidation number of oxygen changes from 0 to -2.

Carbon is oxidized.

Oxygen is reduced.

Electrons are transferred from carbon to oxygen.

Explanation:

Which of the following choices contains the most thermal energy?


a penny that is 20 degrees Celsius ( oC)


an atom of aluminum that is 20 degrees Celsius ( oC)


a 50 milliliter (ml) glass of water at 20 degrees Celsius ( oC)


a 900 milliliter (ml) pitcher of orange juice at 20 degrees Celsius ( oC)

Answers

Answer:

Honestly no idea

Explanation:

FOOOOOOOOD

Helppppp!!!! Please.....

Answers

Club soda so A, you just gotta match the color that it says for it to the chart and it’ll show the identity the ph which is four I believe It said

Which statement best describes John Dalton's use of creativity in his work? He reinterpreted and retested Joseph Proust's results. He used a philosophy to conduct his experiment. He recorded his results as four parts of the atomic theory. He rejected Democritus's idea that matter was composed of atoms.

Answers

Answer: The correct statement is that,

'He reinterpreted and retested Joseph Proust's results'

Explanation:

John Dalton was an English chemist who contributed greatly to the field of Chemistry. He published his theory about atom in 1808.

Dalton was the first person to recognize a workable distinction between the fundamental particle of an element (atom) and that of a compound (molecule). The atomic theory generally summaries the laws of chemical composition which includes:

--> law of constant composition and

---> law of multiple proportions.

John Dalton was being creative in his work by reinterpretation and retesting of Joseph Proust's results. Joseph Proust was a French chemist that first discovered the law of constant composition in 1794. This means that many has started working on the atoms before John Dalton discovery.

From the previous works of Proust, he had studied tin oxides and found that their masses were either 88.1% tin and 11.9% oxygen or 78.7% tin and 21.3% oxygen (these were tin(II) oxide and tin dioxide respectively). Dalton retested and noted from these percentages that 100g of tin will combine either with 13.5g or 27g of oxygen; 13.5 and 27 form a ratio of

Dalton reinterpreted it by finding an atomic theory of matter that could elegantly explain this common pattern in chemistry – in the case of Proust’s tin oxides, one tin atom will combine with either one or two oxygen atoms. I hope this helps, thanks.

Answer:

A.) He reinterpreted and retested Joseph Proust's results

Explanation:

True or False Gases do have a definite shape and volume. ​

Answers

Answer:

false

Explanation:

Answer:

False

Explanation:

It is false as the particles of gases keep moving. They have very weak molecular bonds. They are so weak that they can move freely anywhere and in any direction. Even if you trap some gases and a closed bottle, they keep moving. We can't measure what the shape is or what the volume is. Therefore, it is false.

Hope this is helpful and mark it Brainliest if possible! Good Luck!!!

The mass of a block is 2.5 g the volume of the block is 4.1 mL.  what is the density of the block

Answers

Answer:

6.6g

Explanation:

The tendency of an atom to attract electrons to itself is ionization energy. effective nuclear charge. electron affinity. electronegativity.

Answers

Answer:

electronegativity

Explanation:

Answer:

THe tendoncy is electronegstivity

Explanation:

Im a big brain person

How many total atoms are in K2(H2AsO4)2
5
18
16
12

Answers

Answer:

18

Explanation:

go go evhdj kk nm go go go

What is the specific heat of a substance that absorbs 1000 joules of heat when a sample of 25 g of the substance increases in temperature from 10.0C to 60.0C

Answers

Answer:

1250000

Explanation:

Specific heat is mass times specific heat capacity times change in temperature to get chance in temperature minus the old temperature from the new temperature then complete equation hence 25g×1000j×(60-10)

25g×1000j×50

=1250000g/j/degree Celsius

Four siblings did chores during the weekend. Lin cooked eggs. Gabe raked leaves. Chris sewed buttons on a shirt. Briana dried laundry. Which of these involved a chemical change?

Answers

Answer:

Pretty sure it's A, cooked eggs (so Lin)

Answer:

A

cooking eggs :)

just did it on pf

Explanation:

:)

Balance the following chemical equations

Answers

Explanation:

2Na + I₂ → 2NaI 2KClO₃ → 2KCl + 3O₂K₃PO₄ + 3HCl → 3KCl + H₃PO₄

Crust

Mantle

Core

Lithosphere

Asthenosphere

Mesosphere

Sea- floor spreading

Plate tectonics

Tectonic plates

Convergent boundary

Divergent boundary

Transform boundary

Radioactive decay

Subduction zone

Continental drift

Deformation

Folding

Fault

Shear stress

Tension

Compression

Syncline

Anticlines

Law of Universal Gravitation

Law of Superposition

Law of Conservation of Mass
help Me with the meanings PLEASE And the subject is science

Answers

Crust-In geology, the crust is the outermost solid shell of a rocky planet.

Mantle-A mantle is a layer inside a planetary body bounded below by a core and above by a crust.

Core-is the innermost part of the earth, comprised of the inner core, at the center of the earth, made of iron; and b) the outer core, which surrounds the inner core, made of iron and magma.

Lithosphere-rigid, rocky outer layer of the Earth, consisting of the crust and the solid outermost layer of the upper mantle.

Athenosphere-the upper layer of the earth's mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection is thought to occur.

Mesosphere-the region of the earth's atmosphere above the stratosphere and below the thermosphere, between about 30 and 50 miles (50 and 80 km) in altitude.

Sea floor spreading-the formation of new areas of oceanic crust, which occurs through the upwelling of magma at midocean ridges and its subsequent outward movement on either side.

Plate Tectonics- a theory explaining the structure of the earth's crust and many associated phenomena as resulting from the interaction of rigid lithospheric plates which move slowly over the underlying mantle.

Tectonic plates- A tectonic plate (also called lithospheric plate) is a massive, irregularly shaped slab of solid rock, generally composed of both continental and oceanic lithosphere. ... By contrast, oceanic crust is composed of basaltic rocks, which are much denser and heavier.

Convergent boundary- A convergent boundary is an area on Earth where two or more lithospheric plates collide. One plate eventually slides beneath the other causing a process known as subduction.

Divergent boundary- In plate tectonics, a divergent boundary or divergent plate boundary is a linear feature that exists between two tectonic plates that are moving away from each other.

Transform boundary- A transform fault or transform boundary is a fault along a plate boundary where the motion is predominantly horizontal.

Radioactive decay- a radioactive process in which a nucleus undergoes spontaneous transformation into one or more different nuclei and simultaneously emits radiation, loses electrons, or undergoes fission.

Subduction zone- Subduction is a geological process that takes place at convergent boundaries of tectonic plates where one plate moves under another and is forced to sink due to high gravitational potential energy into the mantle.

Continental drift- Continental drift is the hypothesis that the Earth's continents have moved over geologic time relative to each other, thus appearing to have "drifted" across the ocean bed.

Deformation- the action or process of changing in shape or distorting, especially through the application of pressure.

Folding- A fold is a bend in the rock strata. Folding: Is a type of earth movement resulting from the horizontal compression of rock layers by internal forces of the earth along plate boundaries.

Fault- A fault is a fracture or zone of fractures between two blocks of rock. Faults allow the blocks to move relative to each other. ... Earth scientists use the angle of the fault with respect to the surface (known as the dip) and the direction of slip along the fault to classify faults.

Shear stress- Shear stress is the stress component parallel to a given surface, such as a fault plane, that results from forces applied parallel to the surface or from remote forces transmitted through the surrounding rock.

Tension- in physics, tension is described as the pulling force transmitted axially by the means of a string, a cable, chain, or similar one-dimensional continuous object, or by each end of a rod, truss member

Compression- Compression, decrease in volume of any object or substance resulting from applied stress. Compression may be undergone by solids, liquids, and gases and by living systems.

Syncline- a trough or fold of stratified rock in which the strata slope upward from the axis.

Anticlines- an arch of stratified rock in which the layers bend downward in opposite directions from the crest.

Law of Universal Gravitation- Newton's law of universal gravitation is usually stated as that every particle attracts every other particle in the universe with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

Law of superposition- Law of superposition, a major principle of stratigraphy stating that within a sequence of layers of sedimentary rock, the oldest layer is at the base and that the layers are progressively younger with ascending order in the sequence.

law of conservation of mass- The law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as the system's mass cannot change, so quantity can neither be added nor be removed.

How many molecules are represented in the formula 2CaCO3?

Answers

I believe it would be 2, if CaCO3 is your molecule you will have two because of the number in front :)

I have the coldest temperature of the atmosphere. Who am I?

Answers

Answer:

Jack Frost of course!!!!!!!

Explain how Newton’s third law of motion applies to a system of objects

Answers

Answer:

Newton's third law of motion states that whenever a first object exerts a force on a second object, the first object experiences a force equal in magnitude but opposite in direction to the force that it exerts. Newton's third law is useful for figuring out which forces are external to a system

Explanation:

Answer:

Newton's third law of motion states that whenever a first object exerts a force on a second object, the first object experiences a force equal in magnitude but opposite in direction to the force that it exerts. ... Newton's third law is useful for figuring out which forces are external to a system.

Explanation:

why do the Noble gases have the highest ionization energies across a period?

Answers

Answer:

ionization energy decreases from top to bottom in groups, and increases from left to right across a period. So technically, the noble games have the largest ionization energy.

Explanation:

In photosynthesis, what are the polar molecules?

Answers

Answer:

in photosynthesis polar molecules are molecules that have a diffrent arangment in molecules for example polar water molecule is when oxegen is on one end and the hydrogen is on the other. olmost any compound can have a polar or non polar molecule.

Explanation:

Could cellular respiration
happen without photosynthesis? Explain your
reasoning

Answers

Answer:

No

Explanation:

Without photosynthesis, there would be no sugar, without which there could be no cellular respiration.Both animal cells and plant cells depend on cellular respiration for their energy needs, because both animal cells and plant cells need ATP.

What is true about atoms when they bond? There may be more than one answer.

1. Bonded atoms can never be taken apart

2. Electrons can be transferred

3. They form compounds

4. Compounds have the same characteristics are the atoms that make it up

5. Electrons can be shared

Answers

Answer:

3. 5. and i think thats it

Answer:

3. 5. and i know it is right

Explanation:

What happens to the dry ice after sometime? ​

Answers

Answer:

As a rough rule, five pounds of dry ice will turn from a solid to a gas in 24 hours. It's best to pick up the block of ice just a few hours before your party so it's as frozen as possible when the bash starts.

Explanation:

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