CHEMISTRY HIGH SCHOOL

Which metal is more active than NI and less active than Zn?1. Cu
2. Cr
3. Mg
4. Pb

Answers

Answer 1
Answer:

Answer : The correct option is, (2) Cr (Chromium)

Explanation :

The reactivity series of metal are arranged of the reactivity from the highest to the lowest. Reactivity series is used to determine the products of the single displacement reactions. In the single displacement reaction, the most reactive metal displaces the least reactive metal.

From the given reactivity series we conclude that there are two metal (Mg and Cr) are more reactive metal than the Ni and there are two metal (Pb and Cr) are less reactive metal than the Zn. So, the Cr (Chromium) is the metal which is more active than Ni and less active than Zn.

Hence, the correct option is, (2) Cr
Answer 2
Answer: Cr is more active than nickel and less active than zinc.

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What is the process in which an unstable atomic nucleus emits charged particles or energy or both?a. radioactivity
b. oxidation
c. decomposition
d. none of the above

Answers

Answer:

Option (A)

Explanation:

Radioactivity is defined as a process in which an unstable atomic nucleus decays continuously and after a specific period of time changes into a much more stable element. During this time of decay, the nucleus emits charged particles (energy) which are known as the α, β and γ particles. These are often emitted in the form of electromagnetic energy and are very dangerous to health.

The radioactive elements decay at a certain rate which is commonly known as the half-life. Half-life is basically defined as the time required by a radioactive substance to decay half of its initial composition.

Thus, the correct answer is option (A).

The movement of organisms into a range is called A. immigration.
B. emigration.
C. population shift.
D. carrying capacity.

Answers

The answer is A. Immigration

what do I do when my dog ate my secret 10 pound stash of chocolate and he won't move please help what do i do oh god help me pls​

Answers

Answer:

call an vet ASAP 10 pounds of chocolate is very bad for a dog.

Explanation:

Chocolate is one of the worst things a dog can eat, and 10 pounds of it is worst! Take your dog to the vet IMMEDIATELY! I hope that that the dog will survive.

-------------------------------------------------------------------------------------------------------------Brainiest would make my day, but you don’t have to give it! You’re welcome.

A student has a sample of isopropanol (C3H7OH) that has a mass of 78.6 g. The molar mass of isopropanol is 60.1 g/mol. How many moles of isopropanol are contained in this sample?

Answers

Answer : The number of moles of isopropanol are 1.308 moles.

Solution : Given,

Mass of isopropanol = 78.6 g

Molar mass of isopropanol = 60.1 g/mole

Formula used :

\text{ Number of moles}=\frac{\text{ Given mass}}{\text{ Molar mass}}

Now put all the given values in this formula, we get the number of moles of isopropanol.

\text{ Number of moles}=(78.6g)/(60.1g/mole)=1.308moles

Therefore, 1.308 moles of isopropanol are contained in this sample.
The thing we are asked to calculate here is the amount of the substance in the given sample in units of moles. To obtain this value, the molar mass of the substance is needed. Molar mass has the units of grams per mole so it is a useful value for converting mass into moles.

78.6 g ( 1mol / 60.1g) = 1.31 mol isopropanol

as a result of the gold foil experiment it was concluded that an atom (1) contains protons, neutrons, and electrons(2)contains a small, dense nucleus(3)has positrons and orbitals (4)is a hard and invisible sphere

Answers

 It showed that the atom contains a small dense nucleus. The reason why this can be concluded is that the experiment showed that alpha particles can for the most part pass right through the foil.  This showed that the nucleus of the atom is very small and takes up a very small portion of the size of an atom since the nucleus is what would reflect the alpha particle.  If atoms were not mostly empty space, the alpha particles would have been bounced back and the opposite of what was observed would have happened (all or at least the majority would be bounced back instead the majority getting through with only a small portion being reflected back).

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

Final answer:

The gold foil experiment, conducted by Ernest Rutherford, discovered the existence of a small, dense nucleus within an atom, making answer (2) the correct one.

Explanation:

The gold foil experiment was conducted by Ernest Rutherford and led to the discovery of a small, dense nucleus within the atom. This means that the correct answer to your question is (2) contains a small, dense nucleus. Prior to this experiment, the widely accepted model was the 'plum pudding' model, which had negatively charged electrons embedded within a positively charged sphere. The gold foil experiment upended this model as it was discovered that most alpha particles passed through the gold foil undeterred, but a small fraction was deflected at large angles, suggesting that a tiny but dense packet of positive charge — identified as the nucleus — existed in the center of the atom. This discovery led to the formation of the Rutherford atomic model.

Learn more about Gold Foil Experiment here:

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isotopes are atoms that contain the same number of protons but a different number of neutrons in their nuclei. based on this information, which statement about isotopes is true? a. isotopes are atoms of the same element. b. isotopes are atoms that have the same mass number. c. isotopes are atoms of different elements that have similar chemical and physical properties. d. isotopes are atoms of different elements that belong to the same family on the periodic table.

Answers

c)Chemical properties of elements are primarily determined by the electrons but not by the neutrons. Therefore, the Isotopes of the same element have similar chemical behavior.
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