i don’t know:(
please help!

Answer:

It is c

Explanation:

Answer: Fossil fuels may be used in the production of biofuels.

Explanation: Defeats the purpose of using biofuels over fossil fuels if one contains the other.

Answer:

D

Biofuel Disadvantages:

Labor costs are high, and storage space is limited. Excessive water use, particularly in dry areas. Increasing biomass for biofuel production raises agricultural land requirements. 

Answer:

im an idiot but  i think its A

if im wrong im so sorry

Explanation:

Group 0 is the noble gas elements in periodic table. They are all unreactive because, they have completely filled electronic configuration and thus they are stable. This stability to be a single element make them so.

Noble gases are helium, neon, argon, krypton and xenon. They are 18th group elements in periodic table. Also called zero group elements. The general electronic configuration of these elements is ns² np⁶.

Noble gases contains eight electrons in their valence shell and thus completed octet. Atoms with less number of electrons in valence shell tends to attain octet by losing or gaining electrons to their valence shell.

Every elements except noble gases are electron deficient or electron rich. The electron rich elements will lose their electron to attain stability and the elements with less electrons gain them through bonding. That's why they are existing as molecules.

Therefore, the elements of zero group are highly stable and they do not lose or gain electrons to form molecules.

To find more about noble gases, refer the link below:

https://brainly.com/question/11764545

#SPJ2

Answer:

The hydroxide ion concentration in an aqueous solution, [OH-], in mol L-1, can be calculated if the pOH of the solution is known.

pOH is defined as the negative logarithm (to base 10) of the hydroxide ion concentration in mol L-1 pOH = -log10[OH-]

Explanation:

Answer:

C.4

Explanation:

The arrow 4 represents the transition in which dew is formed.

This is formed as a result of condensation which takes place in the morning or evening and is usually seen on exposed surfaces as water droplets.

The air particles in the form of vapor under low temperatures results in the formation of the substance. The arrow 4 thereby depicts it and makes it the most appropriate choice.,

Read more about Dew here https://brainly.com/question/2696211

Answer:

13

Explanation:

Let's consider the unbalanced equation for the combustion of propane.

C₃H₈ + O₂ ⇒ CO₂ + H₂O

We will begin balancing H atoms by multiplying H₂O by 4.

C₃H₈ + O₂ ⇒ CO₂ + 4 H₂O

Now, we balance C atoms by multiplying CO₂ by 3.

C₃H₈ + O₂ ⇒ 3 CO₂ + 4 H₂O

Finally, we get the balanced equation multiplying O₂ by 5.

C₃H₈ + 5 O₂ ⇒ 3 CO₂ + 4 H₂O

The sum of the coefficients is 1 + 5 + 3 + 4 = 13.

Answer: 322.56 Kelvin

Explanation:

Use the Ideal Gas Law

[tex]PV=nRT[/tex]

R is the gas constant

T is the temperature in Kelvins

P is the pressure in atmospheres

V is the volume in liters

n is the number of moles of gas

First, the mm of mercury need to be converted to atmospheres using the conversion factor 1atm = 760 torr.

[tex]751.2mmHg (torr) =0.988atm[/tex]

Now plug everything in

[tex](0.988)(26)=(0.97)(0.0821)T\\T=322.56K[/tex]

Answer: density = mass/volume

Explanation:

Answer:

a. 4.46 moles de CO₂

b. 80.2 g de H₂O

38.25 moles de H₂

5.55 L de dióxido de carbono

Explanation:

Comenzamos con la reacción: CO₂ (g) + 2 KOH (l) → K₂CO₃ ↓ (s) + H₂O (l)

a. Podemos ver que la relación estequiométrica es 2 a 1.

Pasamos la masa de KOH a moles → 500 g . 1mol/ 56.1g = 8.91 moles

2 moles de KOH necesitan 1 mol de dióxido

Entonces, 8.91 moles necesitarán (8.91 . 1)/2 = 4.46 moles

Convertimos los moles en masa → 4.46 mol . 44g /1mol = 196 g de CO₂

b. Como no tenemos información de los reactivos, trabajamos con el KOH (recorda que siempre hacemos los cálculos con el reactivo limitante).

La relacion estequiometrica también es 2 a 1.

Con 2 moles de KOH producimos 1 mol de agua

Entonces 8.91 moles producirán la mitad, 4.46 moles

Pasamos a gramos  → 4.46 mol . 18g /1mol = 80.2 g de H₂O

N₂ + 3H₂ → 2NH₃

En esta relacion, la relación de moles es 1 a 3.

1 mol de N₂ necesita 3 moles de H₂ para llevar a cabo la reacción

12.75 moles de nitrogeno reaccionarán con (12.75 . 3)/ 1 = 38.25 moles de H₂

La siguiente es una reacción de combustión:

C₃H₈ + 5O₂ → 3 CO₂ + 4 H₂O

Como en este caso tenemos volumen, necesitamos averiguar la densidad del propano para sacar la masa y de ahi los moles:

Densidad del propano es 1.83 g/L

Si tenemos 2 Litros de gas, entonces tendremos el doble de masa

2L .  1.83 g/L = 3.66 g

Convertimos a moles → 3.66 g . 1 mol/44g = 0.083 moles

1 mol de propano produce 3 moles de dióxido.

0.083 moles producirán (0.083 .3) /1 = 0.249 moles

Convertimos a gramos → 0.249 moles . 44g/ 1mol = 10.98 g

La densidad del CO₂ es 1.976 g/L

d = m/V → V = m/d →  10.98 g / 1.976 L = 5.55 L

Answer:Temperature affects storage time and food deteriorates faster at higher temperatures. Microorganisms grow rapidly at room temperature . Thus to slow microbial growth, enzymatic and oxidative processes, food must be stored at room temperature.

Due to decomposition reactions with oxygen or carbon dioxide in the air, meat begins to feel slimy and smell spoiled. ... Because of its smaller surface area, the unsliced meat would have less collisions and therefore, a slower reaction rate.

Explanation:

Answer:

Mass = 100g

Volume = 10 cm³

Density = Mass/Volume

           = 100/10

           = 10 cm-³

Answer:

biggest problem with mainstream renewable energy is intermittency.

Answer:

the biggest problem with mainstream renewable energy is intermittency.

Wind power is only generated when it's windy.

Solar power is only generated when it's sunny.

This creates several fundamental issues.

Answer:

[tex]a=123.04\ m/s^2[/tex]

Explanation:

Given that,

Force applied to a soccer player, F = 56.6 N

The mass of the ball, m = 0.46 kg

We need to find the acceleration of the soccer ball. The force acting on the ball is given by :

F = ma

Where

a is the acceleration

[tex]a=\dfrac{F}{m}\\\\a=\dfrac{56.6 }{0.46 }\\\\a=123.04\ m/s^2[/tex]

So, the required solution is [tex]123.04\ m/s^2[/tex].

Answer:

the applied force is greater than the force of friction

Explanation:

Each enzyme has an optimum pH but it also has a working range of pH values at which it will still work well. This depends on the type of enzyme. The enzyme pepsin breaks down proteins in the acidic conditions of the stomach. ... Catalase has an optimum pH of 9 and a working range of between pH 7-11.        Hope this was helpful

Explanation:

Answer:

New volume v2 = 300.8 ml

Explanation:

Given:

Old volume v1 = 752 ml

Old temperature T1 = 25°C

New temperature T2 = -10°C

Find:

New volume v2

Computation:

Using Ideal gas law formula

V1T2 = V2T1

(752)(-10) = (V2)(25)

New volume v2 = 300.8 ml

Answer:

c

Explanation:

carbon dioxide ......

Answer:

here are some synonyms of invective are abuse, billingsgate, obloquy, and vituperation.

Makes sense to me but I would try and add another sentence in the middle to smooth it out some

Answer:

Yes, but you have a bit of grammar mistakes.

Explanation:

Mount. Vesuvius were an African boundary....

Answer:

B

Explanation:

chemical reaction a process in which one or more substance the recessed ants are converted to one or more different substances the products substances are either chemical elements or compounds a chemical reaction rearranges the consulstituent atoms of reactants to create different substances products

Answer:

Concentration gradient, size of the particles that are diffusing, and temperature of the system affect the rate of diffusion. Some materials diffuse readily through the membrane, but others require specialized proteins, such as channels and transporters, to carry them into or out of the cell.

Explanation:

Hopefully this helps :)

Answer:

3.5% not sure but thank it is

Answer:

im rly good with this stuff and i'm working on genetics and phenotypes and stuff.

Explanation:

information that determines your traits basically from your parents

Answer:

8893.092J

Explanation:

energy= mass × specific heat capacity of water × change in temperature

=32.7×4.184×(77-12)

=8893.092J

Answer:

that is kinda hard I need to serch it up hold on

Answer:

Sorry i might be wrong but I believe the answer is evaporation

Explanation:

Its says the diagram So is there a diagram u can show us?

Answer:

physical change, because a new substance is formed

Explanation: