CHEMISTRY MIDDLE SCHOOL

11.5 grams of sodium metal are placed in a container with excess chlorine gas. Once the reaction is complete, 29.0 grams of sodium chloride are measured. What mass, in grams, of chlorine gas reacted?

Answers

Answer 1
Answer:

Answer:

  • 17.6 g of chlorine gas reacted.

Explanation:

1) Chemical equation:

  • 2Na + Cl₂ (g) → 2NaCl (s)

2) Mole ratios:

  • 2 mol Na : 1 mol Cl₂ : 2 mol NaCl

3) Number of moles of sodium chloride (NaCl) measured (produced):

  • Number of moles = mass in grams / molar mass

  • Molar mass of NaCl = 58.44 g/mol

  • Number of moles of NaCl = 29.0 g / 58.44 g/mol = 0.496 mol

4) Number of moles of chlorine gas (Cl₂) reacted:

  • From the stoichiometric mole ratios:

       1 mol Cl₂ / 2 mol NaCl = x / 0.496 mol NaCl

       x = 0.496 mol NaCl / 1 mol Cl₂ / 2 mol NaCl = 0.248 mol Cl₂.

5) Convert 0.248 mol Cl₂ into mass in grams:

  • mass in grams = molar mass × number of moles
  • molar mass of Cl₂ = 70.9 g/mol
  • mass in grams = 70.9 g/mol × 0.248 mol = 17.6 g ← answer

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Well, think of it this way. If you put a big paper circle on the ground, and then you put smaller circles on top of the big circle, which one would have been there longer? The big circle, of course. So the same logic applies here: if the smaller craters had been older than the big crater, then when the big crater was formed, the smaller ones would've been buried. Therefore, crater 2 is older than the smaller craters inside it.
Hope that helped! =)

What type of allele masks the expression of the recessive allele?

Answers

The Dominant trait or allele masks the recessive because it is dominant. an easy way to remember this is how the lead wolf (dominant alleles) shows it's dominance over the rest of the pack (the recessive alleles)

Please answer!!!!!!!!!!!!!

Answers

I believe it’s Decreased Humus
humus is the organic component of soil formed by the decomposition of leaves and other plant material by soil microorganisms

Answer:

B. Decreased humus

Explanation:

Which statements are false?Check all that apply.

A. The temperature of a substance goes down as heat is added.

B. During a phase change, the temperature of a substance does not
change.

C. If heat is added to a substance, the temperature always
increases

D. The temperature of a substance is constant during a phase
change.

Answers

Answer:

Answer A is wrong

Explanation:

because the temperature increases as soon as the temperature increases

Hope it helps you

Final answer:

Statements A and C are both false. Adding heat to a substance typically causes its temperature to rise, but this is not the case during a phase change. During a phase change, a substance's temperature remains constant because the added heat goes into the phase transition.

Explanation:

In physics, understanding how heat energy affects the temperature and phase state of a substance is crucial. Out of the provided statements, option A and C are false.

A. The temperature of a substance goes down as heat is added - This is false. By default, adding heat to a substance causes its temperature to rise, unless a phase change is in progress.

C. If heat is added to a substance, the temperature always increases - This statement is also false. While it's true in many situations, during a phase change (for example, when ice is melting or water is boiling), adding heat does not raise the temperature. Instead, the energy goes into changing the phase of the substance.

Meanwhile, option B and D are correct. B. During a phase change, the temperature of a substance does not change, and D. The temperature of a substance is constant during a phase change - Both are true statements that reflect the same fact: during a phase change, any added heat goes into the phase transition, not into raising the temperature.

Learn more about Heat and phase changes here:

brainly.com/question/27858185

#SPJ12

Which is an example of a mixture?A. water
B. trail mix
C. hydrogen
D. carbon dioxide

Answers

Answer: Trail mix

Explanation: Because its mixed together with different nuts to make it

Answer:

Trail mix

Explanation:

Trail mix is an example of heterogeneous mixture.

Hydrogen is a compound, same with carbon dioxide.

How could you tell if a sample of matter is a element

Answers

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First: The accuracy or precision, the degree of absence of "bias" (error) in the sample. In other words, the less the error rate is in the sample, the more accurate the sample. Benchmarks for "bias" or error is population.

Cooper and Emory (1995) states that "there is no systematic variance"that means is there is no diversity of measurement due to the influenceof known or unknown, which led to scores tend to lead to a certainpoint.

Second: Precision. The second criterion is to have a good sample estimate of the level of precision. Precision refers to the question of how close we are to estimate population characteristics. There has never been a sample that can fully represent the characteristics of the population. Therefore,in each sampling always attached keasalahan-error, which is known as"sampling error" Precision is measured by standard deviation (standarderror). Thesmaller the difference between the standard deviation obtained from thesample (S) with a standard deviation of the population (s), the higherthe level of precision. Thoughnot always, the level of precision may be increased by adding thenumber of samples, the fault may be reduced if the number of samplesplus (Kerlinger, 1973).
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