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2 years ago

8

Five students had to answer the question how are elements arranged in a periodic table

1 answer:

attashe74 [19]2 years ago

8 0

As the atomic number of an element increases, so does the atomic weight(mass). It should be the first option.

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Matter is made up of small

Lena [83]

Answer:

atoms and molecules

Explanation:

matter is made up of particles called atoms and molecules

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2 years ago

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Which of the following is a transuranium element?<br> Ra<br> Am<br> Tc<br> Pa

lyudmila [28]

Am - it has an atomic number of 95 which is greater than 92.

Transuranium elements are elements with atomic levels greater than 92

3 0

2 years ago

Which of the following displays the correct change in enthalpy and best describes the reaction below? 2CsCl(aq) + Na2SO4(aq) 2Na

Bond [772]

We subtract the enthalpies of the reactants from that of the products:
$2\Delta
 H(NaCl)+\Delta H(Cs_2 SO_4)-2\Delta H(CsCl)-\Delta H(Na_2 SO_4) \\ 
=2(-411)+(-1400) -2(-415)-(-1380) \\ = -12 kJ$
Since this is < 0, this is an exothermic reaction.

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2 years ago

You carry out a titration of a pure weak triprotic acid and only see two major pH jumps. One at 10.0 mL and the second one at 15

mafiozo [28]

23 would be most likely

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2 years ago

I'm trying to do question number 2.56

Lunna [17]

The answer is in the picture which is given below:

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2 years ago