List 4 clues that a chemical reaction is occurring

Answers

Answer 1

Answer: Bubbles, color change, light and heat

Answer 2

Answer: bubbles, color change, temperature change, excess material rubbing off, and noise, like sizzling

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What is the mass of water that results from combining 2.0 g of hydrogen with 16.0 g of oxygen?A. 14.0 gB. 16.0 gC. 18.0 gD. 20.0 g

Some one please help me on this.

Answers

The mould and cast fossil is Option B.

The carbon film fossil is Option C.

The Amber fossil is Option A.

The ice fossil is Option D.

Explanation:

Mould and cast fossils are formed when an organism or any organic object gets buried inside sediment and gets decomposed off, leaving an empty space between the sediments which are occupied by different minerals like carbon, calcium, silica etc. Thus, this mineral takes the shape of that decomposed object and stays for years.

The carbon film fossils are those fossils which take long time to form and are difficult to recover as well. They are formed when some organic substance gets very deep into Earth's surface and gets burned by the interior lava into only a thin layer of carbon.

The amber fossils are very common which are formed when the living organisms get stuck in plant resins and dies, which are enclosed into the plant's resin and are recovered thousands of years after.

The ice fossils aren't actually fossil because in very cold regions, the dead bodies often don't decompose but remain as it is for years. Thus the soft tissues are also recoverable after many years.

What is the [H3O+] in a solution with [OH-] = 2.5 x 10-2 M?a.) 4.0 x 10-^12
b.) 4.0 x 10-^2
c.) 2.5 x 10-^2
d.) 4.0 x 10-^13

Answers

Answer: The $[H_3O^+]$ in a solution is $4.0* 10^(-13)$

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration.

To calculate the pOH of the solution, we use the equation:

$pOH=-\log[OH^-]$

We are given:

$OH^-=2.5* 10^(-2)$

Putting values in above equation, we get:

$pOH=-\log[2.5* 10^(-2)]=1.60$

$pH+pOH=14$

$pH=14-1.60=12.4$

$12.4=-\log[H_3O^+]$

$[H_3O^+]=4.0* 10^(-13)$

The $[H_3O^+]$ in a solution is $4.0* 10^(-13)$

Final answer:

The concentration of H3O+ in a solution with OH− concentration of 2.5 x 10-2 M is 4.0 x 10^-13 M, based on the relationship between H3O+ and OH− in acid-base chemistry.

Explanation:

The question asks for the concentration of hydronium ion ([H3O+]) in a solution with a hydroxide ion concentration ([OH−]) of 2.5 x 10-2 M. This falls under the topic of acid-base chemistry, where the product of [H3O+] and [OH−] is always equal to Kw, the ionic product of water.

In this case, the formula we use is [H3O+] = Kw / [OH–]. Assuming Kw is 1.0 x 10-14 (which is true at 25 degree Celsius), the calculation is [H3O+] = (1.0 x 10^-14) / (2.5 x 10^-2). The answer will be: 4.0 x 10^-13 M.

Therefore, the concentration of [H3O+] in the given solution is 4.0 x 10^-13 M, which matches option d.) 4.0 x 10^-13.

Learn more about Acid-Base Chemistry here:

brainly.com/question/13845995

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What is the correct classification of a mixture in which both a solid and a liquid are visible?A.a homogeneous mixture and a solution
B.a homogeneous mixture and a suspension
C.a heterogeneous mixture and a solution
D.a heterogeneous mixture and a suspension

Answers

Answer is: D.a heterogeneous mixture and a suspension.

Suspension is a heterogeneous mixture (solute particles do not dissolve), that contains solid particles (for example nickel sulfide or NiS) sufficiently large for sedimentation.

The internal phase (solid nickel sulfide) is dispersed throughout the external phase (water).

Another example of a suspension is sand in water.

It would be D.a heterogeneous mixture and a suspension hope this helps

Which part of the human ear is part of the inner ear? A)cochlea
B)oval window
C)ear canal
D)Hammer

Answers

Cochlea is present in inner ear !!

So go with A !!
if you need more info on that ; comment !!

Answer: cochlea

The cochlea is responsible for turning sound waves which is what makes you hear.

Which element has the lowest electronegativity? Calcium(Ca) Gallium(Ga) Selenium(Se) Bromine(Br)

Answers

Gallium has the lowest electronegativity.

Which of these is a biotic factor of an aquarium ecosystem?A:algae growing on the glass
B:gravel on the bottom of the aquarium
C:temperature of the water
D:amount of oxygen in the water

Answers

To solve this we must be knowing each and every concept related to ecosystem. Therefore, the correct option is option A that is algae growing on the glass.

What is ecosystem?

An ecosystem is created by how all living things interact with one another, with the chemical and physical components of their surroundings, and with each other through the movement of energy.

It includes every living item in a certain location along with their nonliving surroundings including air, water, and sunshine. Ecosystems provide for the basic necessities of humans. By supplying us with fresh food and clean water, ecosystems keep us alive.

They supply the basic ingredients we need to meet our demands for food, water, housing, clothes, and transportation. Algae growing on the glass is a biotic factor of an aquarium ecosystem.

Therefore, the correct option is option A.

To know more about ecosystem, here: brainly.com/question/29775110

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I would say A) ALGAE because gravel is abiotic and so is gravel and oxygen and temperature

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