CHEMISTRY MIDDLE SCHOOL

Why does the reaction H2O + Cu→no reaction not proceed to a product?The reaction proceeds too slowly to create products.

Copper has a higher activity than hydrogen and cannot replace it.

Copper has a lower activity than hydrogen and cannot replace it.

The reaction cannot occur because water is a reactant.

answer is Copper has a lower activity than hydrogen and cannot replace it.

Answers

Answer 1

Answer:

Answer: Option (c) is the correct answer.

Explanation:

It is known that a stronger element is able to displace a less stronger element in a chemical reaction.

And, according to the reactivity chart hydrogen is more reactive in nature than copper.

Therefore, when Cu is added to $H_(2)O$ then there will be no reaction because copper is less reactive than hydrogen.

Thus, we can conclude that the reaction $H_(2)O+Cu \rightarrow \text{no reaction}$ not proceed to a product because copper has a lower activity than hydrogen and cannot replace it.

Answer 2

Answer: Copper has a lower activity than hydrogen

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Which solution has the greater concentration?A. 0.500 mole LiCl dissolved in 250 ml solutionB. 0.250 mole LiCl dissolved in 250 ml of solutionC. Both the same

Sort the sentences based on whether the attributes they describe belong to planets or an object that isn't a planet.The object orbits the
The object is a satellite
Sun
The regions surrounding
the object are free from
debris
The object is triangular
in shape.
Planet
Not a Planet
2019 Edmentum All rights

Answers

Answer:

Planet: The object orbits the sun

Not planet: The object is a satellite

Planet: The regions surrounding the object are free from debris

Not Planet: The object is triangular in shape.

Explanation:

A planet is characterized as:

Spheroidal (or at least big enough to be round-ish)

It should orbit the sun (not other planets, so satellites like the moon is not considered as a planet)

It should have no debris, or cleared of debris around its orbit

Although there is now the dwarf planet category, it satisfies almost all charateristics to be considered a planet, except the cleared of debris part.

Answer:

Planet: The object orbits the sun

Not planet: The object is a satellite

Planet: The regions surrounding the object are free from debris

Not Planet: The object is triangular in shape.

Suppose 300 mL of 0.50 M lithium bromide solution and 300 mL of 0.70 M rubidium bromide solution are combined. What is the concentration of the bromide ion in the resulting solution?

Answers

Answer:

0.60 mol·L⁻¹

Explanation:

Data:

LiBr: c = 0.50 mol/L; V =300 mL

RbBr: c = 0.70 mol/L; V =300 mL

1. Calculate the moles of Br⁻ in each solution

(a) LiBr

$\text{Moles} = \text{0.300 L} * \frac{\text{0.50 mol}}{\text{1 L}} = \text{ 0.150 mol}$

(b) RbBr

$\text{Moles} = \text{0.300 L} * \frac{\text{0.70 mol}}{\text{1 L}} = \text{ 0.210 mol}$

2. Calculate the molar concentration of Br⁻

(a) Moles of Br⁻

n = 0.150 mol + 0.210 mol = 0.360 mol

(b) Volume of solution

V = 300 mL + 300 mL = 600 mL = 0.600 L

(c) Molar concentration

$c = \frac{\text{moles}}{\text{litres}} = \frac{\text{0.360 mol}}{\text{0.600 L}} = \textbf{0.60 mol/L}$

The concentration of Br ions in the resulting solution of LiBr and RbBr has been 0.6 M.

The addition of LiBr and RbBr has been dissociated into the equal moles of Li, Rb, and Br.

$\rm LiBr\;\rightarrow\;Li^+\;+\;Br^-$

$\rm RbBr\;\rightarrow\;Rb^+\;+\;Br^-$

Thus 1 mole of LiBr = 1 mole Br

1 mole RbBr = 1 mole Br.

The moles of LiBr in 0.5 M solution:

Molarity = $\rm moles\;*\;(1000)/(volume\;(ml))$

0.5 = $\rm moles\;*\;(1000)/(300\;ml)$

Moles of LiBr = 0.15 mol

The moles of Br from LiBr = 0.15 mol.

The moles of RbBr in 0.7 M solution:

Molarity = $\rm moles\;*\;(1000)/(volume\;(ml))$

0.7 = $\rm moles\;*\;(1000)/(300\;ml)$

Moles of RbBr = 0.21 mol

The moles of Br from RbBr = 0.21 mol.

The total moles of Br ions from LiBr and RbBr has been :

= 0.15 + 0.21

= 0.36 mol.

The total volume of the solution will be:

= 300 + 300 ml

= 600 ml.

The concentration of the Br ion has been:

Molarity = $\rm moles\;*\;(1000)/(volume\;(ml))$

Molarity of Br ions = $\rm 0.36\;*\;(1000)/(600\;ml)$

Molarity of Br ions = 0.6 M.

The concentration of Br ions in the resulting solution of LiBr and RbBr has been 0.6 M.

For more information about the concentration of the sample, refer to the link:

brainly.com/question/11804141

Name and Title:Include your name, instructor's name, date, and name of lab.

Objectives(s):

In your own words, what is the purpose of this lab?

Hypothesis:

In this section, please include the predictions you developed during your lab activity. These statements reflect your predicted outcomes for the experiment.

Procedure:

The materials and procedures are listed in your virtual lab. You do not need to repeat them here. However, you should note if you experienced any errors or other factors that might affect your outcome. Using your summary questions at the end of your virtual lab activity, please clearly define the dependent and independent variables of the experiment.

Data:

Record the elements present in each unknown astronomical object. Be sure to indicate “yes” or “no” for each element.

Hydrogen Helium Lithium Sodium Carbon Nitrogen
Moon One

Moon Two

Planet One

Planet Two

Conclusion:

Your conclusion will include a summary of the lab results and an interpretation of the results. Please answer all questions in complete sentences using your own words.

Using two to three sentences, summarize what you investigated and observed in this lab.
Astronomers use a wide variety of technology to explore space and the electromagnetic spectrum; why do you believe it is essential to use many types of equipment when studying space?
If carbon was the most common element found in the moons and planets, what element is missing that would make them similar to Earth? Explain why. (Hint: Think about the carbon cycle.)
We know that the electromagnetic spectrum uses wavelengths and frequencies to determine a lot about outer space. How does it help us find out the make-up of stars?
Why might it be useful to determine the elements that a planet or moon is made up of?

Answers

this seems like a class project

i support that frfr

Combustion reaction all follow a similar pattern, complete the work equation below Hydrocarbon + ... ---> Carbon... + ....

Answers

Hydrocarbon + Oxygen → Carbon dioxide + Water

Why does a noise sound fainter as you move away from its source?

Answers

Answer:

Uhh..Because as you get farther away then you cant hear the sound waves i think

Explanation:

Answer:

because the sound waves can only travel so far and if there is things near the source the waves bounce off of it. Ex: the speaker in the class room wouldn't be quiet, its like the noise went away as i walked down the halls, maybe the walls were blocking the noise

Explanation:

If someone tells me that scientific knowledge cannot be changed or modified how would I answer that statement

Answers

You would say Scientific knowledge is always being changed and performed in different ways. Scientific knowledge is always being changed as scientist are experiencing and collecting new information everyday using the scientific method.

Final answer:

Scientific knowledge can be changed or modified as scientists use systematic approaches and rigorous methodologies to gather evidence and formulate theories. The scientific method encourages scientists to question existing knowledge, challenge hypotheses, and propose new ideas. Peer review and continuous evaluation help refine scientific knowledge.

Explanation:

Scientific knowledge can indeed be changed or modified. The nature of scientific research is based on the idea of continuous learning and refining our understanding of the world. Scientists use systematic approaches and rigorous methodologies to gather evidence and formulate theories, but these theories are always subject to revision and refinement as new evidence emerges. This is a key aspect of the scientific method, which encourages scientists to question existing knowledge, challenge hypotheses, and propose new ideas.

For example, the theory of evolution has undergone several modifications and updates since it was first proposed by Charles Darwin. As new fossil evidence, genetic studies, and experimental observations have emerged, our understanding of evolutionary processes has evolved and become more nuanced.

In addition, the scientific community engages in peer review, where scientists evaluate and critique each other's work. This process ensures that scientific knowledge is continuously evaluated and refined, and any flaws or limitations in research are identified and addressed.

Learn more about Changing and modifying scientific knowledge here:

brainly.com/question/4757930

#SPJ3

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