Answer : The Correct answer is Tellurium ( Te)
In the compound Rb₂X , Rb is Rubidium which belongs from s block and group 1. Also its electronic configuration is [Kr] 5s¹ , which suggest that oxidation state of Rb is +1 . Since there are two Rb atoms present so total positive charge is +2 .
The compound is neutral means it has zero total charge so total negative charge is -2 . Also the there is one atom of X , so oxidation state of X must be -2 . Element with -2 oxidation state belong to oxygen family or group 16 . Electronic configuration of oxygen family ends with ns² np⁴ , means if the element accommodate 12 electrons , the configuration will become ns² np⁶ nd⁴ , which in turn says that element should have d orbitals .
Oxygen and sulfur belongs to period 2 and 3 respectively so they cannot have d orbital . Tellurium belongs to period 5 ( same period of Rb), it can extend its configuration to d orbital . So the X element can be "Tellurium " (Te) .
3.91584 molecules in 122g of Cu(NO3)2
Answer:
True
Explanation:
Molecular mass of :
Molecular mass of Ca + molevular mass of C + molecular mass of O × 3
40g + 12g + 16 × 3g
= 40g + 60 = 100g
Thus its true
Answer:
2-iodo-2-methylpentane > 2-bromo-2-methylpentane > 2-chloro-2-methylpentane > 2-chloro-2-methylpentane
Explanation:
In this case, the<u> Sn1 reaction</u> would form a <u>carbocation</u>. So, the molecule that can generate a <u>very stable carbocation</u> will be more reactive. We have to remember that <u>tertiary carbocations</u> are the more stable ones. With this in mind, 3-chloropentane would be the <u>least reactive</u> molecules of all.
Then to decide which one is more reactive between the other ones, we have to check the <u>leaving group</u>. In this case, all the atoms are <u>halogens</u>, so if we have a <u>larger atom</u> the leaving group would leave <u>more easily</u>.
With his in mind the larger atom would be I, then Br and finally Cl, therefore the 2-iodo-2-methylpentane would be the <u>more reactive one.</u>
Answer:
This question is incomplete and unclear; the complete question including the missing part is:
Emelie is working on a science project. Her task is to answer the question:
"Does Rogooti (a hair cream sold on TV) affect the speed of hair growth
(in length)". Her family is willing to volunteer for the experiment. Identify the control group (CG) and the independent and dependent variables.
ANSWER:
Independent variable: Rogooti hair cream
Dependent variable: Speed of hair growth/length
Control group: Family members that do not use the Rogooti hair cream
Explanation:
In an experiment, the independent variable is the variable that the experimenter changes or manipulates in order to bring about a measurable response. In this case, the ROGOOTI HAIR CREAM is the independent variable.
Dependent variable refers to the variable that is measured or the variable that responds to the change made to the independent variable. In this case, the dependent variable is SPEED AT WHICH HAIR GROWS (IN LENGTH).
Control group in an experiment is the group that does not receive the experimental treatment. In this case, the experimental treatment is the Rogooti hair cream, hence, the control group will be the VOLUNTEER FAMILY MEMBERS THAT DOES NOT RECEIVE THE ROGOOTI HAIR CREAM ON THEIR HAIR.