The following symbol (<-->) means

Answer:

b

Explanation:

Silicon has the chemical properties that are most similar to those of carbon

Answer:

A

Explanation:

A difference in thermal energy

The study of chemicals is called chemistry.

The correct answer is A.

According to the law of thermodynamics, It states that heat transfers from the high temperature to the low temperature.

According to the question, heat transfer must require the temperature difference between the two systems and allow to flow from high temperature to low temperature.

Hence, the correct answer is A  that is a difference in thermal energy

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Answer:

These genetic changes are not present in a parent's egg or sperm cells, or in the fertilized egg, but happen a bit later when the embryo includes several cells. As all the cells divide during growth and development, cells that arise from the cell with the altered gene will have the mutation, while other cells will not.

Explanation:

Answer:

I think gamma, I'm not sure tho

Answer:

a. Oxygen

b. 2.62 g of NO

c. 85.2%

Explanation:

Let's see the presented reaction:

4NH₃ + 5O₂  →  4NO  +  6H₂O

4 moles of ammonia react to 5 moles of oyxgen in order to produce 4 moles of NO and 6 moles of water.

To determine limting reagent, we need moles of each reactant. Let's calculate them:

3.25 g /17 g/mol = 0.191 moles

3.50 g /32 g/mol = 0.109 moles

4 moles of amonia react to 5 moles of oxygen

Then, 0.191 moles will react to (0.191 . 5) / 4 = 0.238 moles

We only have 0.109 moles available and we need 0.238, so the oxygen is the limting reactant.

5 moles of O₂ can produce 4 moles of NO

So, our 0.109 moles will produce (0.109 . 4) /5 = 0.0872 moles

We convert the moles to mass: 0.0872mol . 30g/mol = 2.62g

(Yield produced / Theoretical yield)  . 100 = %

(2.23g / 2.62g) . 100 = 85.2%

Answer:

Volcanic eruption

Explanation:

a crater is this bowl shaped hole in the ground, and it is caused by a meteorite or volcanic activity

Answer:

0.02 mol.

Explanation:

Explanation:

[H+]=10^-pH

[H+]=10^-9.2

[H+]=6.031x10^-10

[OH-]=1x10^-14÷[H+]

[OH-]=1x10^-14÷[6.031x10^-10]

[OH-]= 1.66x10^-5

im pretty sure this is right

Answer:

When a small amount of external energy in the form of light is applied to the conductor, the valence electrons gain enough energy from the light to break the bonding with the atom and they jumps into the conduction band.

The effect of light on valence bis absent negative charges in the valence band, correspond to electrons elevated to the conduction band. When the semiconductor is lit, current flow is increased by both electrons and holes.

The outermost or valence shell electrons, known as valence electrons, are crucial because they shed light on an element's chemical characteristics and are the ones that are acquired, lost, or shared during a chemical reaction.

In general, when an atom's outermost electron shell is full, it is at its most stable and least reactive.

Thus, The valence electrons get enough energy from the light to break their link with the atom and move into the conduction band when a modest amount of external energy in the form of light is delivered to the conductor.

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Answer:

98 moles of H₂O.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

2HCl + CaCO₃ —> CaCl₂ + H₂O + CO₂

From the balanced equation above,

1 mole of CaCO₃ reacted to produce 1 mole of H₂O.

Finally, we shall determine the number of mole of H₂O produced by the reaction of 98 moles of CaCO₃. This can be obtained as follow:

From the balanced equation above,

1 mole of CaCO₃ reacted to produce 1 mole of H₂O.

Therefore, 98 moles of CaCO₃ will also react to produce 98 moles of H₂O.

Thus, 98 moles of H₂O were obtained from the reaction.

Answer: hydrogen

Explanation:

Answer:

Sorry I am not very good at chemistry.

Explanation:

Answer:

its D I'm pretty sure because it's from high heat/pressure

Answer:

All are correct

Explanation:

I took the test

Answer: pick all

Explanation:

i got 100% on my qiuz

Answer:

reflection

Explanation:

wave reflection is when a sound bounces off something it cannot go through, like echoing

Answer: The spiny lobster belongs to the kingdom ANIMALIA while diatoms belongs to the kingdom PROTISTA.

Explanation:

There are different ways biologists have used to examine and describe million kinds of living organisms. To classify organisms into groups, biologist look for important features that are shared by a large variety of organisms. These features which should have similar origin, structure and position. Organisms with certain important features in common are then put together into one group.

In the hierarchy of living organisms, the largest group of organisms is the KINGDOM. There are five types of kingdoms in which organisms are grouped, these includes:

--> kingdom Monera

--> kingdom PROTISTA,

--> kingdom fungi,

--> kingdom plantae and,

--> kingdom ANIMALIA.

Kingdom PROTISTA: they are single-celled, motile or non-motile organisms that are made up of eucaryotic cells, that is,cell structure is complex with a definite nucleus. Member include the DIATOMS, amoeba and chlamydomonas.

Kingdom ANIMALIA: They are multiple-celled, motile organisms that feed on other organisms. Their cells have no cell walls. The members include the SPINY LOBSTER, corals,worms, snails and cows

Answer:

25.4/km=3

Explanation:

Answer: [tex]AgNO_3(aq)+NaOH(aq)\rightarrow AgOH(s)+NaNO_3(aq)[/tex]

Explanation:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.  

A double displacement reaction in which one of the product is formed as a solid is called as precipitation reaction.  

The equation which represents a precipiation reaction is:

[tex]AgNO_3(aq)+NaOH(aq)\rightarrow AgOH(s)+NaNO_3(aq)[/tex]

Answer:

it should be B (i did this wrk before)

Explanation:

Answer:

1.33 moles per second

Explanation:

From the balanced equation of reaction, 3 moles of H2(g) need to disappear/be consumed before 2 moles of NH3(g) can be formed/appear.

According to reaction law, the rate of disappearance of reactants is equal to the rate of appearance of products.

Now, only 2 moles per seconds of H2 has disappeared initially;

3 moles H2 is needed for 2 moles NH3

2 moles H2 will give;        2 x 2/3 = 4/3 or 1.33 moles

Hence, if the initial rate of disappearance of H2 is 2.0 moles per second, the initial rate of appearance of NH3 would be 1.33 moles per second.

Answer:

A- 3.0110 X 10^24

Explanation:

I took the quiz

The term mole concept is used here to determine the number of atoms of potassium. The number of atoms of potassium present in 195.49 grams is 3.011 × 10²⁴.

One mole of a substance is defined as that quantity of it which contains as many entities as there are atoms exactly in 12 g of carbon - 12. The formula used to calculate the number of moles is given as:

Number of moles of atoms (n) = Given mass / Gram atomic mass

The given mass of potassium =  195.49 g

The atomic mass of 'K' = 39.098 g

n = 195.49 / 39.098 = 5 mol

Number of atoms = Number of moles of atoms × 6.022 × 10²³

5 mol ×  6.022 × 10²³ = 3.011 × 10²⁴

Thus the number of atoms is 3.011 × 10²⁴ .

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Answer:

c=-1+x=varible+a=(5)^3

Explanation:

facts

Answer:

Explanation:

Polar side chains tend to be present on the surface of a protein where they can interact with the aqueous environment found in cells. On the other hand, non-polar amino acids tend to reside within the center of the protein where they can interact with similar non-polar neighbors.