CHEMISTRY HIGH SCHOOL

Which type of radioactive emission has a positive charge and weak penetrating power?(1) alpha particle (3) gamma ray
(2) beta particle (4) neutron

Answers

Answer 1
Answer:

According to the research, alpha particles are a type of radioactive emission that has a positive charge and weak penetrating power.

What is a alpha particle?

They are very heavy particles that have a positive charge and are composed of two protons and two neutrons from the nucleus of the atom.

That is to say, it is a completely ionized nucleus, without its ideal electron coating, identical to the Helium nucleus and they are of low penetrability.

Therefore, we can conclude that according to the research, alpha particles are a type of radioactive emission that has a positive charge and weak penetrating power.

Learn more about alpha particles here: brainly.com/question/24276675

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Answer 2
Answer: 1. alpha particle
alpha particles are positively charged helium nuclei with weak penetrating power

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What net ionic equation describes the reaction when these solutions are mixed?Given the equation: Na3PO4 (aq) + CaCl2(aq) → A. 2PO43–(aq) + Cl– (aq) → Cl2(PO4)3(s) B. 2Ca2+(aq) + Na+(aq) → NaCa2(s) C. Na+(aq) + Cl– (aq) → NaCl(s) D. 2PO43–(aq) + 3Ca2+(aq) → Ca3(PO4)2(s)

Identify the type of reaction in KBrO3(s)  KBr(s)
+ O2(g)

Answers

I had this question in chemistry, and i'm sure it's a  decomposition reaction.
I believe an oxidation reaction is occurring

Which solution when mixed with a drop of bromthymol blue will cause the indicator to change from blue to yellow 1) 0.1 M HCl. 2) 0.1 M CH3OH. 3) 0.1 M NH3. 4) 0.1 M NaOH

Answers

The solution that when mixed with a drop of bromthymol blue will change the indicator to yellow is A. 0.1 M HCl.

What is an indicator?

An indicator simply means a substance that has measurable and observable characteristics that is important to depict an acidic or alkaline substance.

In this case, the solution that when mixed with a drop of bromthymol blue will change the indicator to yellow is 0.1 M HCl.

Learn more about indicators on:

brainly.com/question/25031970
1) is the answer because the only way to turn it from blue to yellow is to mix it with an acidic solution. 

Outliers existing in a data set will have the greatest impact on __________. A. the mean B. the median C. the mode D. the middle

Answers

Outliers are the ones that are least precise among the data. They may be due to experimental or human errors. In the case of having outlier in the data, its effect is most significant n computing the mean because they are included in the calculation. The median mode and middle do not involve calculation but only the ordination, so they are not affected.

Answer:

Outliers existing in a data set will have the greatest impact on :

            option: A is the correct answer.

               A.  The mean.

Step- by- step explanation:

We know that an outlier is a data value or the data point that stands out of the rest of the data points of the set i.e. it either attains a too high or too low value as compared to other data points.

            Hence, the outlier will effect the mean of the data set.

( Since, when a too low value is present in the set then after removing that value the mean of remaining elements or data points will increase after removing the outlier.

For example if we have data set as:

       1      30   34    39    41    45

Then mean of the set is:

Mean=(1+30+34+39+41+45)/(6)\n\n\nMean=31.667

and on removing 1 from the set we get:

Mean=(30+34+39+41+45)/(5)\n\n\nMean=37.8

Hence, we see that the mean is increased.

Similarly, if there is a data value which is too high then after removing that element the mean of the remaining data points will decrease )

Which is a redox reaction?A) 2KBr + F2 ---> 2KF + Br2
B) 2HCL + Mg(OH)2 --> 2HOH + MgCl2
C) 2NaCl + H2SO4 --> Na2SO4 + 2HCl
D) Ca(OH)2 + Pb(NO3)2 --> Ca(NO3)2 + Pb(OH)2

I know the answer is A, but confused as to why that is. Can someone explain this for me? Thanks.

Answers

You have to look at the oxidation states of each atom in the reaction.  Since redox reactions involve the transfer of electrons from one element to another, 2 elements need to have oxidation state changes.  
option a is the only option that has a change in oxidation sates.  Fluorine goes from 0 to -1 indicating that it gained electrons (got reduced) while bromine goes from -1 to 0 indicating it loses electrons (got oxidized).
(2Br⁻→Br₂+2e⁻ and F₂+2e⁻→2F⁻).

I hope this helps.  Let me know if anything is unclear.

18. Which of the following reactions are endothermic or exothermic? Explain your answers. A. When a certain amount of potassium nitrate is dissolved in water, the water temperature drops from 23°C to 18°C. B. Jack cooks himself a steak. C. When cold water is mixed with sulphuric acid, the mixture can rapidly reach the boiling point of water. D. A flare burns up slowly.

Answers

Answer:

The answer to your question is below

Explanation:

An endothermic reaction absorbs heat to proceed.

An exothermic reaction releases heat to proceed.

A. When a certain amount of potassium nitrate is dissolved in water, the water temperature drops from 23°C to 18°C. This is an example of an endothermic reaction because of the temperature diminishes.

B. Jack cooks himself a steak. This is an endothermic reaction because the steak does not cook itself it needs heat to be cooked.

C. When cold water is mixed with sulphuric acid, the mixture can rapidly reach the boiling point of water. This is an exothermic reaction because the temperature of water increases, which means that energy is been released.

D. A flare burns up slowly. I think it is an endothermic reaction because it was supply energy to proceed.

Whiskers and beaks are two examples of _____. electroreceptors mechanoreceptors olfactory receptors photoreceptors

Answers

Whiskers and beaks are two examples of _____. electroreceptors mechanoreceptors olfactory receptors photoreceptors

Whiskers and beaks are two examples of olfactory receptors. An olfactory receptor is a smell receptor that contains a protein capable of binding odor molecules that plays the central role of smell.

Answer:

its mechanoreceptors

Explanation:

mechanoreceptors react to pressure and distortion.
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