heleep I don't understand
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Answer:

no

Explanation:

When doing experiments, it's to find out how what you're doing will end up in the results. Even when expecting something, it may not end up that way. Trial and Error you could say

Answer:

d

Explanation:

b/ce The strong force effects produce a mass that is essentially independent of the kinds of quarks involved, so this mass contribution will be the same for the proton and neutron.

Answer:

Chemical change.

Hope this helps you.

Answer:

mark me as a brainlist answer

Explanation:

Oxygen

Answer:

The density is the mass per unit volume of a substance.

Density is important when working out if something will float in water, and it can also be useful for calculating the mass of a specific volume of a substance.

Explanation:

Nitrogen exists as a diatomic molecule, N2 (subscript 2). It exists as a gas at room temperature because of the type of interactions with other identical molecules: weak intermolecular forces are present between the molecules, specifically temporary dipole-dipole interactions.

These interactions are the second weakest type of intermolecular force (Van Der Waals and Hydrogen Bonds are the other two with Hydrogen Bonds being stronger).

Now the reason why Nitrogen exists as gas is that these weak intermolecular forces can be overcome with little energy. Therefore, at room temperature, Nitrogen exists as a gas.

Nitrogen has a low melting and boiling point and is a gas at room temperature. The Earth's atmosphere is made up of 78% nitrogen. The next most common gas is oxygen, at 21%. Nitrogen isn't very reactive, but it can react with oxygen at high temperatures, such as in-car engines.

Nitrogen forms an extensive series of nitrides with carbon, including those with chain-, graphitic-, and fullerene-like structures.

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Answer:

4

Explanation:

If there is 12 boxs that cost $48, you need to divide the 12 boxs into the $48 to see how many time 12 goes into it to see how much it is. So 48 divided by 12 is 4.

Answer:

eu sou do brasil :D gostaria de saber como é ai nos estados unidos :D

Explanation:

Answer:

Explanation:

I think that C is the best limitation you could pick. I doubt you could be on the beach at 4 am. So the gulls that visit the beach would be unknown to you at night. That's half the day you could not account for.

Answer:

[tex]thank \: yo[/tex]

Answer:

Well in short, if u want more explanation u can ask

1. Only one side benefits

2. Plants needs sunlight for photosynthesis, so if a large plant is blocking all that sunlight, that small plants won't have sufficient sunlight

1) The predator or parasite both derive nutrients from the other organism.

Usually predators quickly kill the prey while parasites slowly weaken or kill their host

2) The plant blocks sunlight from reaching smaller plants. This is an issue because

without the sun, plants can't get the food they need to grow, reproduce and survive. This hinders their ability to photosynthesize

3) fox and rabbit

flower and bee

whales and barnacles

dog and tick

The molecules of gases and liquids are present far apart from each other. In other words, they have more gaps or intermolecular spaces. Due to the large intermolecular forces, the intermolecular attractions are very less and thus liquids and gases can flow.

When you have collected a lot of data most likely need to use a computer to analyze data. Option B is correct.

The analyzed data is a system in which the unmanaged data or the messy data can be arranged in a recognizable sequence for the better study of something for which data is to be maintained.

The computer is needed for the process as the computer has some special characters to maintain tables according to alphabets and according to the number and can be taken out anytime want.

Therefore, Option B is correct. When you have collected a lot of data most likely need to use a computer to analyze the data.

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Answer:

The virus's genome is uncoated from the protein and injected into the host cell.

Explanation:

Explanation:

Neon is [Ne] 3s2 3p3 = 1s2 2s2 2p6 3s2 3p3.

Answer:

b is correct

Explanation:

Answer:

B.  state matter change from solid to liquid.

Explanation:

Melting happens when a solid turns (melts) into a liquid.

hope i helped

Taking into account the definition of density, the density of the liquid is 0.76 [tex]\frac{g}{mL}[/tex].

First of all, density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.

In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance.

Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

[tex]density=\frac{mass}{volume}[/tex]

From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.

In this case, you know:

So, replacing in the definition of density:

[tex]density= \frac{19 g}{25 mL}[/tex]

Solving:

[tex]density= 0.76 \frac{g}{mL}[/tex]

Finally, the density of the liquid is 0.76 [tex]\frac{g}{mL}[/tex].

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Answer:

l think it's hydrogen chloride

Explanation:

C2H2 will be left  when the burning is complete.

The equation of the reaction is; 2C2H2 + 5O2 --> 4CO2 + 2H2O

The number of moles of C2H2 reacting is = 1.20 g/26 g/mol = 0.046 moles

The number of moles of O2 is = 3.50 g/32 g/mol = 0.109 moles

Since;

2 mole of C2H2 reacts with 5 moles of O2

x moles of C2H2 reacts with 0.109 moles of O2

x = 2 mole × 0.109 moles/5 moles

x = 0.044 moles of C2H2.

It then follows that C2H2 is the reactant in excess so C2H2  will be left  when the burning is complete.

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Explanation:

basically, you'll just have to convert the given grams into moles, convert that into moles of Br, and then convert it again into grams of Br

The amount of gram of [tex]Br_{2}[/tex] will be  65.1 grams in equation [tex]2AlCl_{3} + 3Br_{2}[/tex]→ [tex]2AlBr_{3} + 3Cl_{2}[/tex].

The definition of a gram was given as the mass of one cubic centimeter of pure water at 4 degrees Celsius.

Calculation of amount of  [tex]Br_{2}[/tex]

The given equation is [tex]2AlCl_{3} + 3Br_{2}[/tex]→ [tex]2AlBr_{3} + 3Cl_{2}[/tex].

The mass of  [tex]Br_{2}[/tex]  = Count of bromine molecule × molar mass

The mass of  [tex]Br_{2}[/tex]   = 0.4072 × 159.8

The mass of  [tex]Br_{2}[/tex]   = 65.08 mol.

The amount of gram of  [tex]Br_{2}[/tex]  will be  65.1 grams in equation  [tex]2AlCl_{3} + 3Br_{2}[/tex]→ [tex]2AlBr_{3} + 3Cl_{2}[/tex].

Therefore, the answer will be option (a).

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Answer:

0.3mol C8H18

Explanation:

For this we must first look at the reaction taking place:

C8H18+O2 --> H2O + CO2

Balancing the equation we get:

2(C8H18)+25(O2) --> 18(H2O) + 16(CO2)

Form there we now need to know how many moles of Octane are needed to produce 2.4moles of H2O. The conversion is as follows:

2.4molH2O ((2mol of C8H18)/(18mol of H2O)) = 0.3mol C8H18

Answer: d = 2.70 g/mL

Explanation: Considering we know that it weights 40.5 brains and the volume of such amount is 15 ml we can calculate such in which it comes to be 2.7 grams per mL

Explanation:

just trying...hope that helps

Answer:

Synthesis reaction is 2 or more chemical combing to form  complex product (A+B→AB)

Decomposition occurs when one reactant breaks down into 2 or more products (H2CO3→H2O+CO2)  

Single replacement is a reaction when one element is substituted for another element compound.                                                   (A+BC→ AC+B)

Double replacement occur when parts of 2 ionic compounds are exchanged making two new compounds .(A+B - + C + D- → A+D- +C )

The activation energy of the particular reaction will determines the rate at which it will go. The higher the activation energy gets, the slower the chemical reaction will become.  

Explanation:

Answer:

the equation for cylinders is V = (pi)r2h

none of these are even close but i can do a little more research

sorry if this one wasnt as much help

Answer:

B. as a food preservative in the manufacture of detergents

.........

Answer:  1.34 g/ml

Explanation:  Density is an objectives mass divided by it's volume:

(43.23 g)/(32.1 ml) =1.34 g/ml

Answer:

This is an English server, sorry

Explanation:

Answer:

3.99 × 10 ^-28

Explanation:

In the equation of E = hc/λ, the h = 6.626 × 10^−34 J and c = 3 × 10^8 m/s

E =  6.626 × 10^−34 × 3 × 10^8 divided by 498

E = 3.99 × 10 ^-28