Could someone plz help me? :(

Answer:

Chemical change

Explanation:

Because a new substance is formed.

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:

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:

35.50 atomic mass

Explanation:

1. Multiplicate each isotope mass by its abundance

35 uma x 75% = 26.25 amu

37.01 uma x 25% = 9.2525 amu

2.  Add the values

26.25 +  9.2525  = 35.50 atomic mass

Explanation:

just trying...hope that helps

Frequencies of light that fall below the frequency threshold if the metal do not eject electrons.

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.

Learn more about What is nitrogen gas at room temperature? here: https://brainly.com/question/14747312

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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:

I believe the answer to your question would be A. this is because it is controlled with a good habitat and also has good variants that are needed in a good plants growth.

Explanation:

Answer:

that's is a theory

Explanation:

hope it may help you

Answer:

[tex]thank \: yo[/tex]

Answer:

1 = 252g, 2 = 2mL, 3 = 1.5mL, 4 = 3g, 5 = 225g, 6 = 0.92g/mL, 7 = 0.75g/mL, 8 = 0.71g/mL, 9 = 1.9mL, 10= 1.11mL, 11 = 76.9g

Explanation:

This problem is testing how well you can move around the equation D = m/v where D = Density (g/mL), m= mass of sample (g), v = volume of sample (mL).

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:  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

the Answer is

6.5e-6 m^3

[6.5e-6 = 6.5 x 10-6 = 0.0000065]

Answer:

0.0000065 m³

Explanation:

To convert a cubic centimeter measurement to a cubic meter measurement, divide the volume by the conversion ratio.

Since one cubic meter is equal to 1,000,000 cubic centimeters, you can use this simple formula to convert:

cubic meters = cubic centimeters ÷ 1,000,000

m³ = 6.5 ÷ 1,000,000

m³ = 0.0000065

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].

Learn more about density:

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:

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

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

Answer:

B. as a food preservative in the manufacture of detergents

.........

Answer:

Chemical change.

Hope this helps you.

Answer:

endothermic reaction

Explanation:

because salt dissolve water

Answer:

EXOTHERMIC REACTION AS WHEN YOU TOUCH IT YOU WILL FEEL SOME HEAT.

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:

hi <3

i believe the correct option would be C

hope this helps :)

Answer:

the acceleration that it gives to freely falling objects.

Explanation:

i took quiz

Answer:

C

Explanation:

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.

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