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2 years ago

Who arranged the elements according to atomic mass, and used the arrangement to predict the properties of missing elements.

Chemistry

2 answers:

Karolina [17]2 years ago

6 0

Answer:

i think it's C

Explanation:

But if it's wrong,im so sorry

Verdich [7]2 years ago

5 0

Answer:

Explanation:

the answer is C dmitri mendeleev

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Heat is transferred in there ways wat and wat ???

Tamiku [17]

Answer:

Radiation

Conduction

Convection

Explanation:

Radiation: Transfer of heat by electromagnetic rays (Example: A microwave heating food)

Conduction: Transfer of heat energy from one object to another through direct contact (Example: Getting out of bed and your warm feet touch cold tile, making the tile warm and your feet cold)

Convection: Movement of heat by a fluid such as air or water (Example: A convectional oven works by heating the air inside the oven to evenly cook food)

Hope this helps!

4 0

2 years ago

If 35 ml of 6.0 m h2so4 was spilled, calculate the minimum mass of nahco3 that must be added to the spill to neutralize the acid

belka [17]

The balanced equation between the $H_2SO_4$ and $NaHCO_3$ is:

$H_2SO_4+2NaHCO_3\rightarrow Na_2SO_4+2CO_2+2H_2O$

Formula of molarity is:

$Molarity = \frac{Moles of solute}{Volume of solution in Liters}$

$Molarity = 6.0 M, Volume = 35 mL = 0.035 L$

Substituting the values,

$6 = \frac{Moles of solute}{0.035}$

$Moles of solute = 0.035 L\times 6 mol/L = 0.21 mole$

So, number of moles of $H_2SO_4$ is $0.21 mole$ .

From the balanced equation it is clear that for 1 mole of $H_2SO_4$ , 2 moles of $NaHCO_3$ are required.

Hence, 0.21 mole of $H_2SO_4$ = $2\times 0.21 mole = 0.42 mole of NaHCO_3$

Molar mass of $NaHCO_3$ = $84.007 g/mol$

So, the mass of $NaHCO_3$ = $84.007 g/mol \times 0.42 mol = 35.283 g$

6 0

3 years ago

Scientists think the earth is approximately how old?

tiny-mole [99]

I think the answer is approximately 4.12 billion years since the amount of years is 4.543 billion years

6 0

3 years ago

Read 2 more answers

What is a common feature of elements in group 1, group 2 and group 3?

Papessa [141]

Answer:

all of them have seven valence electron

8 0

2 years ago

Read 2 more answers

An atom has the following electron configuration 1s2s2sp63s23p64s2 How many valance electrons does this atom have?

JulijaS [17]

Answer:

The electron configuration for this atom is Calcium, which has 2 valence electrons.

Explanation:

Following the periodic table and with the electron configuration, you will end up with calcium, which has 2 valence electrons. (Always follow the electron configuration from left to right! It begins at hydrogen, then to helium... and so on.)

1s2 -> He....

2s2 -> Be....

2p6 -> Ne...

3s2 -> Mg...

3p6 -> Ar...

4s2 -> Ca.

6 0

3 years ago