help? It’s question 9

Answer: here is your answer hope this helps I’m sorry if I get it wrong

Explanation:

This means that the nuclei of all oxygen atoms have eight protons. A neutral oxygen atom will also have eight electrons. In an oxygen ion with a 2− charge, the number of protons is still 8, but the number of electrons is 10. This results in the oxygen ion having an octet (8) of valence electrons.

Answer:

B. 3 g/cm³

Explanation:

Given data:

Mass of paper clip = 9 g

Volume of paper clip = 3 cm³

Density of paper clip = ?

Solution:

Formula:

d = m/v

Density is equal to the mass of substance divided by its volume.

Units:

SI unit of density is Kg/m3.

Other units are given below,

g/cm3, g/mL , kg/L

by putting value,

d = 9 g / 3 cm³

d = 3 g/cm³

Answer:

The answer is B, 106

Explanation:

looked it up

Answer:

Matter can change state when thermal energy is transferred into or out of the substance. Ice melts and liquid water boils as thermal energy is added. Water vapor condenses and liquid water freezes as thermal energy is removed.

Answer:

B

Explanation: Density by definition is the amount of matter per given volume.

The mass after 16.042 days : 1.4 g

Given

mass of 5.6 gram sample of I-131

time=16.042 days

Required

The mass of a sample

Solution

General formulas used in decay:  

[tex]\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{t/t\frac{1}{2} }}}[/tex]

T = duration of decay  

t 1/2 = half-life  

N₀ = the number of initial radioactive atoms  

Nt = the number of radioactive atoms left after decaying during T time  

Half-life of I-131 = 8 days

Input the value :

[tex]\tt Nt=5.6.\dfrac{1}{2}^{16.042/8}\\\\Nt=\boxed{\bold{1.4~g}}}[/tex]

Answer: sandbars

Explanation:

Answer:

mol ratio and molar mass

Explanation:

Answer:

C

Explanation:

Different scientific models are used to represent an atom. It is because atoms are too small to see and to study their structure and electronic properties we need a model.

Scientific models are visual representations or mathematical expression to make a scientific concept easy to understand. Atomic models are scientific models to represent the atomic structure and properties.

There are various theoretical models for atomic structure in which the latest one is Bohr's model. This model suggests that the electrons are revolving around the nucleus through circular paths of definite energies.

Subatomic particles, electrons, protons, and neutrons are microscopically small and we can't make its clear picture by reality. Therefore, using suitable experiments and assumptions scientists are proposing various theoretical models for atomic structure.

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Answer:

B. uplift is answer

Explanation:

may be this is helpful!

Answer:

Catalyst, in chemistry, any substance that increases the rate of a reaction without itself being consumed. Enzymes are naturally occurring catalysts responsible for many essential biochemical reactions.

Explanation:

In 1 molecule of the compound C₆H₁₂O₂ there are 12 moles of hydrogen atoms

Given

C₆H₁₂O₂ compound

Required

moles of Hydrogen

Solution

In a compound, there is a mole ratio of the constituent elements.

The empirical formula is the smallest comparison of atoms of compound forming elements.  

A molecular formula is a formula that shows the number of atomic elements that make up a compound.  

In the C₆H₁₂O₂ compound, there are 3 forming elements: C, H and O

The number of each element is indicated by its subscript

C: 6 moles

H = 12 moles

O = 2 moles

Answer:

The event placed in order is;

b, a, c, d

Explanation:

1) b) The marble is placed on a wooden sled

Before the marble is lifted up the ramp, it is placed on a wooden sled that allows the pulley system which can be attached to the wooden sled to lift it up the ramp

2) a) The marble is moved up the ramp using the pulley system

The attached pulley system is then used to move the marble up the ramp

3) c) Iron wedges are used to break the massive marble

The massive marble is broken into pieces that can be worked upon by each mason

4) d) Masons begin carving the marble

The masons (more than one mason) begin carving the pieces of marbles into shape

Answer:

D has to be based on facts so d would be the answer and idea that can only be proven true those are facts not hypothesis or guesses

Explanation:

based on a body of facts that have been repeatedly confirmed through observation and experiment. Such fact-supported theories are not "guesses" but reliable accounts of the real world."

Answer:

4 moles of H₃PO₄

Explanation:

The reaction expression is given as;

     3KOH   + H₃PO₄   →   K₃PO₄   +  3H₂O

Number of moles of water  =  12moles

Unknown:

Number of moles of H₃PO₄ = ?

Solution:

 From the balanced reaction expression we see that;

          3 moles of water is produced from 1 mole of H₃PO₄

So;    12 moles of water would be produced from [tex]\frac{12}{3}[/tex] = 4 moles of H₃PO₄

Answer:4 moles of H₃PO₄

Explanation: did the test homie

Answer: Physical change : tearing of paper, fixing of wtaer

Chemical change:  rusting of iron ,  electrolysis of water​, Rancidification

Explanation:

Physical change is a change in which there is no rearrangement of atoms and thus no new substance is formed. There is only change in physical state of the substance.

Example:  tearing of paper, fixing of wtaer

Chemical change is a change in which there is rearrangement of atoms and thus new substance is formed. There may or may not be a change in physical state.

Example: rusting of iron ,  electrolysis of water​, Rancidification

Answer:

Carbon monoxide

As then Oxygen is available in sufficient amount

Explanation:

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Answer:

: cathode rays

a beam of electrons emitted from the cathode of a high-vacuum tube.

During the 1880s and '90s scientists searched cathode rays for the carrier of the electrical properties in matter. Their work culminated in the discovery by English physicist J.J. Thomson of the electron in 1897.

Answer:

B. changes in energy during the reaction

Explanation:

y-axis measures "energy" and x-axis measures "reaction progress". Those units fit well with (B) and not so well with concentration and time (A), phases and temperature (C), or reaction rate and time (D).

Answer:

b. changes in energy during reaction

Explanation:

graph

Answer: an electric generator

Explanation:

The answer is A) An electric generator.

Kinetic power is the strength of the movement, observable as the motion of an item, particle, or set of debris. Any item in motion is using kinetic electricity: someone on foot, a thrown baseball, a crumb falling from a desk, and a charged particle in an electric field are all examples of kinetic power in paintings.

There are 3 subcategories of kinetic energy: vibrational, rotational, and translational. Vibrational kinetic strength is, unsurprisingly, a result of items vibrating. Rotational kinetic power is created with the aid of shifting items, while translational kinetic power is due to gadgets colliding with one another.

Something at domestic that moves are an instance of kinetic energy. this can be a cue ball rolling on a billiards table, a fan circulating air on a warm day, or glass shattering on the floor after it falls from the counter. electrical gadgets that are becoming on use kinetic energy as do humans transferring about the residence.

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Answer:

The heart

Explanation:

Answer:

The heart

Explanation:

Because its an organ and i got it right ;)

Answer:

CO2

Explanation:

it's the simplest whole number ratio of atoms of each element in the compound.

Answer:

C2O4

Explanation:

Answer:

A frog heart has three chambers.two atrium and one ventricle is answer

Explanation:

I hope it's helpful!

Explanation:

it will have 9 electrons because atomic number is equals to number of protons and number of protons is equal to number of electrons in an atom

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Answer:

it's-B.....................