CHEMISTRY MIDDLE SCHOOL

Two or more assistanceSubstances form a _____ when they come together without forming a new substance

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Answer 1
Answer: I believe it would be a compound.

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Out of sodium,rubidium,aluminum,and indium which is the most reactive metal
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Apple trees reproduce naturally by sexual reproduction. How does this explain why there are many types of Apple's? Be sure to mention meiosis and chromosomes in your answer

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Answer:

Sexual reproduction can be described as the method of reproduction in which the offsprings produced will have half the chromosomes as compared to the parent cell. The other half of the chromosomes to make a complete set would arise from the other parent. In this way, the offspring produced will carry half of the chromosomes from the female parent and half from the male parent.

Crossing over and independent assortment are two phenomenons of meiosis due to which genetic diversity occurs and the offsprings born are not exactly similar to the parent cell.

Answer:  The four cells that are produced by meiosis has only one of each chromosome. One of these four cells from one parent combines with another from the other parent to produce the offspring. An offspring gets half its chromosomes from each parent. But the exact combination of chromosomes it gets from each parent is random. So, each offspring ends up with a unique set of genes different from its parents and other offspring.

What do you think about this volcanoes? For my science project so be as honest or brutally honest as possible!

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It's awesome does that thing explode? I hope the shape was a bit more cone-like.
Wow that looks really cool and if anyone did have something bad to say about it, it is already to late to change it so they would just have to deal woth it.

4. Which of the following is a pseudo-noble-gas electron configuration?O A 1s22s22p3s23p%3d10
OB 1s22s22p63s23p6
OC 1s22s22p63s2305
OD 1s22s²2p63s23d10452

Answers

Answer:

1s2 2s2 2p6 3s2 3d5  is a pseudo-noble-gas electron configuration

Explanation:

It is the technetium with atomic number 43. Being the lightest element having isotopes with all radioactive and no one are more stable as compared to that of technetium which is in fully ionised state i.e. 97 Tc. This element is mostly used for gamma ray emission in medical treatment. Also found to be used as corrosion inhibitor in case of steel, when present in small amount gives better result. This metal is silver grey colour that is found to discoloration when comes in contact with moist air. Its isotopes are radioactive.

Answer:

1s2 2s2 2p6 3s2 3p6 3d10

Explanation:

A pseduo noble gas configuration refers to charged species with electron configurations that are almost identical to that of one of the noble gases.

The noble gas (n-1)d^10 (where n refers to the principal quantum number of the outer s orbital) configuration of ions is commonly known as a pseudo noble gas configuration. The configuration stated in the answer is for Cu^+ ion. n in the case of Cu^+ ion is 4(since copper metal has a 4s1 level).

Note that; 1s2 2s2 2p6 3s2 3p6 is the electron configuration for argon, followed by 3d^10. Hence our definition for a pseudo noble gas.

Humans are protected from some infections by specialized cells which produce chemicals that

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those cells kill microbes

What are the words that describe how matter changes state

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"Phase" describes a physical state of matter. The key word to notice is physical. Things only move from one phase to another by physical means. If energy is added (like increasing the temperature) or if energy is taken away (like freezing something), you have created a physical change. 

Please help!!!The reaction of sulfuric acid (H2SO4) with potassium hydroxide (KOH) is described by the equation below. Suppose
0.06 L of KOH with unknown concentration is placed in a flask with bromthymol blue indicator. A solution of 0.20 M
H2504 is dripped into the KOH solution. After exactly 0.017 L of H2SO4 is added, the Indicator changes from blue to
yellow. What is the concentration of the KOH? You must show all of your work to earn credit. (4 points)
H2SO4 + 2KOH → K2SO4 + 2H20

Answers

Answer:

         \large\boxed{\large\boxed{1M}}

Explanation:

1. Reaction

  H_2SO_4+2KOH\rightarrow K_2SO_4+2H_2O

2. Mole ratio

    (2molKOH)/(1molH_2SO_4)

3. Sulfuric acid

     Molarity=(moles)/(volume(liters))

     Moles=Molarity* Volume(liters)

     Moles=0.20M* 0.017liter=0.034molH_2SO_4

4. Potassium hydroxide

    (2molKOH)/(1molH_2SO_4)* 0.034molH_2SO_4=0.068molKOH

    Molarity=(0.068mol)/(0.06liter)=1.13M\approx 1M
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