Shanghai Science and Technology Press senior one chemistry workbook answers

Shanghai Science and Technology Press senior one chemistry workbook answers

It has geography and chemistry

As long as the title is OK, it is the extraction of bromine and iodine from seawater (I). No longer, it is OK as long as you fill in the blank!

2.3 extract bromine and iodine from seawater 1. In the following statement about the physical properties of bromine, the error is (c) a bromine is liquid at room temperature, B bromine is volatile, C bromine is yellow green liquid, D bromine can be dissolved in water, more easily soluble in organic solvents such as carbon tetrachloride 2. In the following statement about the use of bromine, the error is (a) a liquid bromine can

The number of electrons in the outermost layer of an anion with two units of negative charge loses two electrons, which is three times the number of electron layers outside the nucleus. This element is () A oxygen B carbon C chlorine D fluorine

The number of electrons in oxygen a is 6 and the number of electron layers outside the nucleus is 2
The number of electrons in the outermost layer is three times that in the outer core
So it's oxygen

Dissolve 6.56g of sodium bicarbonate and the mixture of sodium carbonate and 10 molecular water in water to make 100ml solution, in which the amount of sodium is 0.5mol/l. Add a certain amount of hydrochloric acid to the solution to react completely. After the solution is evaporated dry, the solid mass obtained is? A 2.93g B 5:85g C 6:56 G D unable to determine What should we do to solve such calculation problems in chemistry?

The answer is a. solve the problem according to the conservation of Na atoms. The solid formed by the mixture dissolved in water and evaporated to dryness is NaCl, which is table salt. According to the conservation of Na atoms, the amount of substance generating NaCl is 0.5mol/l multiplied by 0.1L, which is 0.05mol NaCl. Therefore, the mass is 0.05mol multiplied by (23 + 35.5) g / mol = 2.925g. You can keep the 2-digit small number

According to a particle scattering experiment and other scientific facts, why is the following inference about atomic structure correct? 1. The nucleus must be positively charged________________________________ 2. The nucleus is so hard that it cannot penetrate________________________ 3. The nucleus is small relative to the yard______________________ 4. The atomic mass is almost concentrated on the nucleus_______________________ 5. Extranuclear electrons are moving at high speed_________________________

1. The nucleus must be positively charged___________ RIGHT_____________________ 2. The nucleus is so hard that it cannot penetrate________________________ 3. The nucleus is small relative to the yard_____ RIGHT_________________ 4. The mass of the atom is almost concentrated on the nucleus

Senior chemistry Workbook How strong is the mass penetration of P2 alpha rays and other rays? Taking 1 / 12 of 12C as the standard, what does it mean??

α The X-ray is essentially a helium nuclear current, which has strong ionization ability but weak penetration, and can be blocked by a thin piece of paper; β X-ray is essentially an electron flow, and its ionization ability is relatively low α The radiation is weak and the penetration is strong, so it is often used in radiotherapy; γ X-ray is essentially the same as X-ray. It is an electromagnetic wave with extremely short wavelength and high energy. It is a photon flow, uncharged, moving at the speed of light and has strong penetration
α Is the relative mass of helium nucleus 4
β The relative mass of electrons is very small 0.00000091 (forget how many zeros, which are generally ignored anyway)
γ It's photons. You can think there's no mass,