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2 years ago

A good hypothesis allows you to make a testable prediction. Which of the following is an example of a good, testable prediction?

Chemistry

1 answer:

Elina [12.6K]2 years ago

8 0

Your answer would be B. If I add salt to ice cubes, they will melt faster.
I did this and got it right.

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What are the two most common elements in the entire universe

g100num [7]

Answer: Hydrogen and Helium

Explanation: Hydrogen is made from from one proton and one electron, making them one of the simplest forms of elements in the universe. Combining hydrogen atoms creates helium, the second most common element in the Universe.

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3 years ago

Read 2 more answers

Name two elements that have the same properties as calcium (Ca). (4 points)

enyata [817]

beryllium, magnesium, strontium,barium, and radium.

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3 years ago

At 25°C, the equilibrium constant Kc for the reaction in thesolvent CCl4 2BrCl <----> Br2 + Cl2 is 0.141. If the initial c

ivolga24 [154]

Answer: The equilibrium concentration of bromine gas is 0.00135 M

Explanation:

We are given:

Initial concentration of chlorine gas = 0.0300 M

Initial concentration of bromine monochlorine = 0.0200 M

For the given chemical equation:

$2BrCl\rightleftharpoons Br_2+Cl_2$

Initial: 0.02 0.03

At eqllm: 0.02-2x x 0.03+x

The expression of $K_c$ for above equation follows:

$K_c=\frac{[Br_2]\times [Cl_2]}{[BrCl]^2}$

We are given:

$K_c=0.141$

Putting values in above equation, we get:

$0.141=\frac{x\times (0.03+x)}{(0.02-2x)^2}\\\\x=-0.96,+0.00135$

Neglecting the value of x = -0.96 because, concentration cannot be negative

So, equilibrium concentration of bromine gas = x = 0.00135 M

Hence, the equilibrium concentration of bromine gas is 0.00135 M

8 0

3 years ago

How many moles of atoms are contained in 15.7 g of Bromine

Vlada [557]

1 mol of Br = 79.9 g

15.7 g / 79.9 g = 0.196 moles of atoms

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3 years ago

What are some structures inside a cell that help it live and perform its role in an organism

Anni [7]

Mitochondrial Atp,lysome digest bad things, nucleus contain DNA ribosomes synthesize proteins

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2 years ago