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k0ka [10]
3 years ago
6

Is the following sentence true or false? Mendeleev used his periodic table to predict the properties of undiscovered elements.

Chemistry
2 answers:
Amanda [17]3 years ago
7 0
False, his periodic table was the first one, nobody knew about more elements in that time rather than the ones in the periodic table
Vinvika [58]3 years ago
7 0
True because at the time some scientists did not know the unknown elements.
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Calculate the density of mercury of it pours exactly 22.5 mL into a graduated cylinder and has a mass of 316 g.
Rasek [7]
Density = mass/volume = 316/22.5 = 14.045g/mL. 
8 0
3 years ago
Give the quantum number set for one electron in the 3p sublevel of a sulfur (S) atom.
IceJOKER [234]
<span>sulfurs electronic configuration is 1s2 2s2 2p6 3s2 3p4 so for the 3p sublevel principal quantum no - 3 angulum quantum no - 1 magnetic quantum no - (-1) or 0 or (-1) spin quantum no - (+1/2) or (-1/2) so the quantum numbers will be [ 3 , 1, -1 , +1/2 ] or [ 3 , 1, -1 , -1/2 ] [ 3 , 1, 0 , +1/2 ] or [ 3 , 1, 0 , -1/2 ] [ 3 , 1, 1 , +1/2 ] or [ 3 , 1, 1 , -1/2 ]
Hope This Helps</span>
7 0
3 years ago
An object is uniformly accelerated from rest to a speed of 35 meters per second in 7 seconds. The acceleration of the object is
gavmur [86]
Its 5m/s because you have to find out how many meters for one second so you divide
35/7=5 so that's your answer
3 0
3 years ago
Read 2 more answers
1) Humans have how many sets of teeth?
Verizon [17]
<span>1) Humans have how many sets of teeth?

C) 4

2) Adults have how may permanent teeth?

B) 32

3) What type of food products make teeth stronger?

Cheese and Yogurt

4) What is the visible part of the tooth?

C) crown



5) What part of the tooth is harder than bone?

D) dentin


6) What part of the tooth is soft and contains the nerves?
A) pulp


7) What refers to the alignment of the teeth?
</span><span>
Occlusion</span><span>

8) The lower teeth protect what?

D) tongue


9) Malocclusion is the least common reason for referral to orthodontists.

False



10) Usually, malocclusion is hereditary.
True


11) Which type of malocclusion is commonly referred to as an overbite?

Class Two

12) Bacteria are living organisms than cause cavities.
True




13) What is the whitish film that grows on your teeth called?

Plaque 

14) What is the best fighter of cavities?

Fluoride

Gingivitis is the inflammation of the
A) gums



16) Gingivitis is permanent.

False


17) Name 2 ways to fight gingivitis.

Proper Toothbrushing and Flossing
</span>Professional Dental Cleanings<span>

18) The cause of gum disease is

B) bacteria



19) Untreated, periodontitis will progress until your teeth loosen and fall out.
True


</span>
6 0
3 years ago
Can someone help me with number 1 and 2 plz!
GalinKa [24]

Answer:

1) 0 N

2) 8 N

Explanation:

The net force is the sum of all of the forces acting on the object.

For question 1, we can see that there is a force of 5 N acting to the right and 5 N acting to the left.  If we define the right to be positive and the left to be negative, then the net force equals:

Fnet = 5N - 5N = 0 N

Therefore, the net force in question 1 is 0 N.

For question 2, the process is very similar.  We want to find the sum of the forces acting on the object.  In this case, there are forces of 3 N and 5 N acting to the right.

Fnet = 3 N + 5 N = 8 N

Therefore, the net force in question 2 is 8 N.

Hope this helps!

3 0
3 years ago
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