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erastova [34]
3 years ago
6

Which statements describe an element? Check all that apply.

Chemistry
1 answer:
Molodets [167]3 years ago
8 0

Answer:

<em>Hello, Your answer will be B,C,E, And F.</em>

Explanation:

An element is a substance whose atoms have same number of protons which means all atoms in an element have same atomic number. Elements are simplest substances which cannot be broken down by physical changes or chemical reactions. Elements are classified by their names and symbols. Hope That Helps!

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What is instantaneous acceleration?A. how fast a speed is changing at a specific instant B. how fast a velocity is changing at a
joja [24]
If i had to answer i would choose a  hope this helps
8 0
3 years ago
Consider the formation of ammonia in two experiments. (a) to a 1.00-l container at 727°c, 1.30 mol of n2 and 1.65 mol of h2 are
emmasim [6.3K]
When it comes to equilibrium reactions, it useful to do ICE analysis. ICE stands for Initial-Change-Equilibrium. You subtract the initial and change to determine the equilibrium amounts which is the basis for Kc. Kc is the equilibrium constant of concentration which is just the ratio of products to reactant. 

Let's do the ICE analysis

      2 NH₃ ⇄ N₂ + 3 H₂
I         0        1.3    1.65
C     +2x       -x      -3x
-------------------------------------
E       0.1        ?        ?

The variable x is the amount of moles of the substances that reacted. You apply the stoichiometric coefficients by multiplying it by x. Now, we can solve x by:

Equilibrium NH₃ = 0.1 = 0 + 2x
x = 0.05 mol
Therefore,
Equilibrium H₂ = 1.65 - 3(0.05) = 1.5 mol
Equilibrium N₂ = 1..3 - 0.05 = 1.25 mol

For the second part, I am confused with the given reaction because the stoichiometric coefficients do not balance which violates the law of conservation of mass. But you should remember that the Kc values might differ because of the stoichiometric coefficient. For a reaction: aA + bB ⇄ cC, the Kc for this is

K_{C} = \frac{[ C^{c} ]}{[ A^{a} ][ B^{b} ]}

Hence, Kc could vary depending on the stoichiometric coefficients of the reaction.
8 0
3 years ago
Calculate the mass in grams of each sample.
OlgaM077 [116]

Answer: The answer is A. - 4.88x10^20 H2O2 molecules

Explanation: I hope this helps!

4 0
3 years ago
Replay the animation carefully noting the purple arrows what does this adsorbed energy do? This is 6th grade sicence pls help it
elena-s [515]

The adsorbed energy helps in heat the absorption. In the animation, the purple arrows represent energy that is being absorbed from the water

<h3>What is an animation?</h3>

It is a way of making a movie from many still images. The images are put together one after another, and then played at a fast speed to give the illusion of movement.

Someone who makes animations is called an animator.

Learn more about animation:

brainly.com/question/25109803

5 0
2 years ago
What changes in color occur when bromine reacts with an alkene​
Gala2k [10]

Answer:

Explanation: Bromine, the dark red color disappears quickly as the atoms of bromine bond with the atoms of carbon in the double bond.

7 0
3 years ago
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