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Tresset [83]
3 years ago
9

Plzzz fastttt answerrr

Chemistry
1 answer:
Colt1911 [192]3 years ago
6 0

Answer:

<em>- Communication between scientists increased. </em>

<em>- Technological advancements were made.</em>

<em></em>

Explanation:

The complete question is

Which answer choices correctly describe why the number of known elements more than doubled by 1861?

Select all that apply.

 -  Metalworkers began using new metals.

- Communication between scientists increased.

- The American Civil War started.

- Technological advancements were made.

Technological advancement allowed more elements to be properly analysed and classified, and knowledge sharing between scientist by means of communication made it possible for the known number of elements to double by 1861

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How are some of The physical properties of metals related to the fact that our study supply of electricity is able to reach our
julsineya [31]

I'm pretty sure the answer would be that the metal is conductive, which travels through the copper wires.

7 0
3 years ago
predict an element that would react with water as lithium (Li), sodium (Na), and potassium (K) did. explain.
Alexeev081 [22]
Any of the other alkali metals not mentioned (I.e. rubidium, caesium or francium). They are all group one metals meaning that they contain one valence (outer shell) electron so they will have similar properties. Francium is the most reactive alkali metal while lithium is the least reactive (if you’d like me to explain that let me know :) )
5 0
3 years ago
Magnesium has three naturally occurring isotopes with masses of 23.99, 24.99, and 25.98 amu and natural abundances of 78.99%, 10
Darya [45]
Atomic mass of magnesium = (23.99 x 78.99%) + (24.99 x 10.00%) + (25.98 x 11.01%)
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5 0
4 years ago
A bowling ball (mass = 7.2 kg, radius = 0.10 m) and a billiard
evablogger [386]

Answer:

Maximum gravitational Force: F_{gmax} = 1,026*10^{-08} N

Explanation:

The maximum gravitational force is achieved when the center of gravity are the closer they can be. For the spheres the center of gravity is at the center of it, so the closer this two centers of gravity can be is:

bowling ball radius + billiard ball radius = 0,128 m

The general equation for the magnitude of gravitational force is:

F_{gmax}  = G \frac{M*m}{r_{min}^{2} }

Solving for:

G = 6,67*10^{-11}  \frac{Nm^{2}}{kg^{2}}

M = 7,2 kg

m = 0,35 kg

r_{min} = 0,128 m

The result is:

F_{gmax} = 1,026*10^{-08} N

3 0
4 years ago
2.0 grams of ZnSO4 reacts completely with Li2CO3; how many grams of Li2SO4 would be produced?
grin007 [14]
Moles of ZnSO4 = Mass/Mr
= 2/(65.4 + 32.1 + (16 x 4))
= 0.012383.... mol

Since there is no chemical equation provided, I will assume that the ratio of ZnSO4:Li2CO3 is 1:1

Therefore there are 0.012383 mil of Li2SO4 as well
So the mass would be Moles x Mr = 0.012383.... x ((6.9 x 2) +32.1 + (4x16))
= 1.360 g of Li2SO4 produced
3 0
3 years ago
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