1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
sdas [7]
3 years ago
5

Which statement is true about alkali metals? A. Some of them explode when exposed to water. B. They are in group 18 of the perio

dic table. C. They are not conductors of heat or electricity. D. They are not very reactive.
Physics
2 answers:
WINSTONCH [101]3 years ago
5 0
The Answer To This Is A , The Most Reactive Of The Alkali Explode Due To Reactions To Water

Tju [1.3M]3 years ago
5 0

Alkali metals are all highly reactive (D is false) so they would not be found in their uncombined form (A is true) ans at least some of them are highly water soluble ( C is false) (b is false) Check out the Periodic Table - you will see the Alkali metals.

You might be interested in
If a certain silver wire has a resistance of 3.00 Ï at 11.0°c, what resistance will it have at 25.0°c?
Romashka [77]
11.30      times the nuber of toys
7 0
3 years ago
(1) Explain : Market and its characteristics.​
AlekseyPX

Answer:

market is a place where we sell or buy things ( goods)

it's characteristics are

buying and selling goods

perfect competitions

market doesn't refer only a fix place

6 0
2 years ago
Having a good range of motion is super important because that is what allows you to ________________.
kotykmax [81]
A is the correct answer I think
6 0
2 years ago
During lightning strikes from a cloud to the ground, currents as high as 2.50×10^4 Amps can occur and last for about 40.0 micros
dangina [55]

Answer:

1 C

Explanation:

The intensity of electric current is defined as

I=\frac{q}{t}

where

I is the current

q is the amount of charge transferred

t is the time interval during which the charge is transferred

For the lightning in this problem, we have

I=2.50\cdot 10^4 A is the current

t=40.0 \mu s = 40.0\cdot 10^{-6} s is the time interval

Solving the formula for q, we find the amount of charge transferred:

q=I t = (2.50\cdot 10^4 A)(40.0\cdot 10^{-6}s)=1 C

6 0
2 years ago
A penny has a mass of 2.50 g, a diameter of 19.55 mm, and a thickness of 1.55 mm. Calculate the density of the material from whi
Dmitry [639]
Density = (mass) divided by (volume)

We know the mass (2.5 g).  We need to find the volume.

The penny is a very short cylinder.
The volume of a cylinder is (π · radius² · height).
The penny's radius is 1/2 of its diameter = 9.775 mm.
The 'height' of the cylinder is the penny's thickness = 1.55 mm.

Volume  =  (π) (9.775 mm)² (1.55 mm)

             =  (π) (95.55 mm²) (1.55 mm)

             =  (π) (148.1 mm³)

             =        465.3 mm³

We know the volume now.  So we could state the density of the penny,
but nobody will understand what we have.  Here it is:

         mass/volume = 2.5 g / 465.3 mm³  =  0.0054 g/mm³  .

Nobody every talks about density in units of ' gram/(millimeter)³ ' .
It's always ' gram / (centimeter)³ '.
So we have to convert our number for the volume.

                         (0.0054  g/mm³)  x  (10 mm / cm)³

                 =      (0.0054 x 1,000)  g/cm³

                 =          5.37  g/cm³  .

This isn't actually very close to what the US mint says for the density
of a penny, but it's in a much better ball park than 0.0054 was.
4 0
3 years ago
Other questions:
  • A brown bear runs at a speed of 9.0\,\dfrac{\text m}{\text s}9.0 s m ​ 9, point, 0, start fraction, start text, m, end text, div
    11·2 answers
  • What system carries food to cells though the blood ?
    8·1 answer
  • Tell whether the following statements are true or false:
    13·1 answer
  • Convert the speed of light, 3.0 x 108 m/s, to km/s.
    7·1 answer
  • 1. height of tower when stone dropped from it reaches ground in 10s is​
    5·1 answer
  • What's faster a slow car or a fast feather?​
    9·2 answers
  • T or F. A virtual image can sometimes be seen on a screen; it just depends on the situation.
    6·1 answer
  • A ball is thrown so that its initial vertical and horizontal components of velocity are 30 m/s and 15 m/s, respectively. Estimat
    7·1 answer
  • What is the potential difference needed to achieve a current of 16A with a resistance of
    6·1 answer
  • Use heavy-duty grounded extension cords. Heavy-duty cords will have a marking on the insulation such as ___.
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!