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Tarek would like to germinate pumpkin seeds for his science project. He wraps the seeds in a dry paper towel and places them on the windowsill. Tarek waits, but the seeds will not grow. What conditions should Tarek have used to germinate the seeds? (2 points)

a
The paper towel should be wet, and the seeds should be placed in a dark place.

b
The dry paper towel should be placed in a pot filled with soil.

c
The paper towel should be dry and transparent.

d
The seeds should be placed in a dark place.

Answer:The answer is C) The total mass of C and D only.

Answer:

52.5 g

Explanation:

Density= mass/volume

Rearranging the equation gives us m= d(V)

m= d(V)

m= (10.5 grams/cm^3)(5 cm^3)

m= 52.5 g

Answer:

b

Explanation:

trust

Answer:

B

Explanation:

Responder:

2H2 + O2 → 2H2O

CaO + H2O → Ca (OH) 2

Fe + S → FeS

H2SO3 → SO2 + H2O

CaCO3 → CaO + CO2

Explicación:

2H2 + O2 → 2H2O

2 moléculas de hidrógeno gaseoso reaccionan con oxigente para producir 2 moléculas de agua

CaO + H2O → Ca (OH) 2

El óxido de calcio reacciona con el agua para producir hidróxido de calcio.

Fe + S → FeS

El hierro reacciona con el azufre para producir sulfuro de hierro.

H2SO3 → SO2 + H2O

Por descomposición, el ácido sulfuroso se descompone para producir dióxido de azufre y agua.

CaCO3 → CaO + CO2

El carbonato de calcio se descompone para producir óxido de calcio y dióxido de carbono.

Answer:

c

Explanation:

Answer: C

Explanation:

Answer: 1.47 g

Explanation:

207.2 g/mol × 0.0071 mol = 1.47 g

You can find the molar mass of lead, Pb, on the periodic table, 207.2 g/mol.

0.0071 moles lead = 1.47112 grams

Explanation:

Cada producto o servicio, independientemente de su propósito, debe ser seguro de usar y desarrollado de acuerdo con los más altos estándares de calidad y seguridad.

Algunos ejemplos de cálculo incorrecto de ingredientes que tendrían graves consecuencias químicas podrían ser:

Medicamentos y vacunas: Este es quizás uno de los ejemplos que tendría las consecuencias más graves para las personas si hubiera un cálculo incorrecto de ingredientes, ya que la producción de medicamentos y vacunas es una industria que requiere la máxima calidad agregada debido a que se ocupa directamente de la salud y los errores de formulación pueden agravar la enfermedad y causar la muerte. Actualmente tenemos el ejemplo de la vacuna para el control de la pandemia, que antes de ser aprobada tuvo que someterse a una serie de investigaciones, pruebas en humanos y diferentes fases para demostrar su efectividad y no causar daño al organismo humano.

Cosméticos: Existen cosméticos de la industria de la belleza que tienen la función de prevenir el envejecimiento cutáneo, alisar el cabello, etc. Por tanto, un cálculo incorrecto de los ingredientes químicos también podría provocar daños irreversibles a la salud, como quemaduras en la piel, caída del cabello, alergias, cáncer, etc.

Alimentos: La industria alimentaria utiliza componentes químicos con el fin de conservar los productos y aumentar la vida útil, por lo que si se usan en cantidades mayores de las necesarias, dichos compuestos pueden causar enfermedades en las personas como intoxicación alimentaria, cáncer, gastritis, etc.

Answer:

Option A an E.

Explanation:

Energy can be described as the capability to do work. It is what has to be transferred to an object in order to get this object to do work. Energy can be in various forms such as heat energy, kinetic, potential, electrical, chemical, nuclear etc.

It takes energy to do quite a number of things, from cooking food to driving and also in engaging in exercises.

Answer:

1. a) 0.745 g of H₂SO₄

b) 97.4%

2.  1.28×10²⁴ formula units

Explanation:

First of all, we determine the equations:

3Na₂SO₄   +  2H₃PO₄  →  3H₂SO₄  +  2Na₃PO₄

We determine, the moles of sodium sulfate. (As the acid is in excess, we work with the salt)

1.08 g . 1mol/ 142.04g = 0.00760 moles.

Ratio is 3:3. So 3 moles of salt can produce 3 moles of sulfuric acid,

Then, 0.00760 moles will produce the same amount of acid.

We convert the moles to mass → 0.00760 mol . 98 g/mol = 0.745 g

Percent yield = (Produced yield /Theoretical yield) . 100

(0.726 g / 0.745 g) . 100 = 97.4 %

2. 3 moles of sodium sulfate need 3 moles of phosphoric acid to react

Then, 3.2 moles of salt will react to (3.2 . 2)/3 = 2.13 moles

Let's count the formula units:

2.13 mol . 6.02×10²³ formula units /mol = 1.28×10²⁴ formula units.

Answer:

The TV signal.

Explanation: Hope this is right! :)

Answer:

A conjugate acid, within the Brønsted–Lowry acid–base theory, is a chemical compound formed when an acid donates a proton to a base—in other words, it is a base with a hydrogen ion added to it, as in the reverse reaction it loses a hydrogen ion

Explanation:

According to the A.P.E.X. glossary:

A conjugate acid is the form a base takes after it gains a hydrogen ion (or proton), and a conjugate base is the form an acid takes after it loses a hydrogen atom (or proton).

Answer:

B.mass of the neutrons and protons

Explanation:

hope it's help..

Answer:

104 g

Explanation:

i just solved it

Answer:

.5

Explanation:

Answer:

1.5

Explanation:

1.5

Answer:

i think b

Explanation:

A student measures the volume of a rock and then repeats the measurement two times. For the three measurements to be very precise the measurements must be very close to one another for rock. Option B is correct.

While measuring something is the measured value is close to each other then the result measurement is said to be precise and the phenomena are called precision.

In the measurement of rock, the measured values must be close to each other and do not vary much then only the measurement of students can be precise.

Therefore, Option B is correct, the measurements must be very close to one another for the rock student measures the volume of a rock and then repeat the measurement two times. For the three measurements to be very precise.

Learn more about  precise, here:

https://brainly.com/question/1311561

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Answer:

The first one is correct, 4.03 x 10^24.

Answer:

I took a screen shot of your image, and wrote on top of it!

Explanation:

Hope this helps! :)

Answer:

an agent that helps accept electrons on others like oxygen, halogens

Explanation:

a substance that tends to bring about oxidation by being reduced and gaining electrons.

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AMSWER:

B. I'm sorry if this is wrong

Explanation:

Answer:

Specific heat is defined by the amount of heat needed to raise the temperature of 1 gram of a substance 1 degree Celsius (°C). Water has a high specific heat capacity which we'll refer to as simply "heat capacity", meaning it takes more energy to increase the temperature of water compared to other substances.

Explanation:

Answer:

1. false

2. true

Explanation:

I hope this helps

Answer:

The pressure in atm is 6.04 x 10^-3

Explanation:

Pressure of the gas is defined as the force exerted by the particles on the walls of the container. It is expressed in various terms like 'mmHg', 'atm', 'kiloPascals' etc..

All these units of pressure are inter convertible.

Pressure of the gas = 4.59 mm Hg

760 mm Hg = 1 atm

4.59 mm Hg= 1/760 x 4.59 = 6.04 x 10^-3atm

The pressure in atm is 6.04 x 10^-3

salat tarawih itu boleh dilakukan di masjis

Answer:

finally found

31th July 2000

The carrying capacity is the maximum number of individuals of a species that an environment can support. Population size decreases above carrying capacity due to a range of factors depending on the species concerned, but can include insufficient space, food supply, or sunlight.