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2 years ago

What do the images embedded in rock represent?

Chemistry

1 answer:

xeze [42]2 years ago

7 0

You're correct It's D :))))))))

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At 20 degrees celsius, how much sodium chloride could be dissolved in 2L of water

aalyn [17]

The source below says 35.89g of NaCl dissolve in 100 g of water at 20 °C.

(35.89g / 100 mL) x (2000 mL) = 718 g

Hope this helped

8 0

2 years ago

As a chemical reaction occurs, the thermometer in the container records an increase in temperature. What is true of the reaction

iren2701 [21]

The second one is correct

7 0

2 years ago

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Molecules that are similar enough to a neurotransmitter to bind to its receptor sites on a dendrite and block that neurotransmit

nataly862011 [7]

Molecules that are similar enough to a neurotransmitter to bind to its receptor sites on a dendrite and block that neurotransmitter's effects are called antagonists.

6 0

2 years ago

2 HI(g) ⇄ H2(g) + I2(g) Kc = 0.0156 at 400ºC 0.550 moles of HI are placed in a 2.00 L container and the system is allowed to rea

Alex_Xolod [135]

Answer: The concentration of hydrogen gas at equilibrium is 0.0275 M

Explanation:

Molarity is calculated by using the equation:

$\text{Molarity}=\frac{\text{Number of moles}}{\text{Volume of solution (in L)}}$

Moles of HI = 0.550 moles

Volume of container = 2.00 L

$\text{Initial concentration of HI}=\frac{0.550}{2}=0.275M$

For the given chemical equation:

$2HI(g)\rightleftharpoons H_2(g)+I_2(g)$

Initial: 0.275

At eqllm: 0.275-2x x x

The expression of $K_c$ for above equation follows:

$K_c=\frac{[H_2][I_2]}{[HI]^2}$

We are given:

$K_c=0.0156$

Putting values in above expression, we get:

$0.0156=\frac{x\times x}{(0.275-2x)^2}\\\\x=-0.0458,0.0275$

Neglecting the negative value of 'x' because concentration cannot be negative

So, equilibrium concentration of hydrogen gas = x = 0.0275 M

Hence, the concentration of hydrogen gas at equilibrium is 0.0275 M

4 0

2 years ago

Round 0.007062 to 4 significant numbers

mafiozo [28]

Answer

its already rounded

Explanation:

8 0

3 years ago