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
Trava [24]
3 years ago
6

In the early 1600's, Galileo used a telescope to investigate dark features on the Sun's surface and used them to calculate the r

ate of the sun's rotation. What areas of relatively cool gas were Galileo observing?
prominences
solar flares
photospheres
sunpsots
Chemistry
1 answer:
KatRina [158]3 years ago
4 0

Answer:

I think its "sunspots"

Explanation:

You might be interested in
What does it mean for an acid and base to neutralize each other?
ruslelena [56]
This means that they mixed .
6 0
3 years ago
A 25 kg rock is placed in a graduated cylinder with water.the volume of the fluid is 18.3ml.calculate the density of the rock in
ipn [44]

Answer:

=> 1366.120 g/mL.

Explanation:

To determine the formula to use in solving such a problem, you have to consider what you have been given.

We have;

mass (m)     = 25 Kg

Volume (v) = 18.3 mL.

From our question, we are to determine the density (rho) of the rock.

The formula:

p = \frac{m}{v}

First let's convert 25 Kg to g;

1 Kg    = 1000 g

25 Kg = ?

= \frac{25 × 1000}{1}

= 25000 g

Substitute the values into the formula:

p =  \frac{25000 g}{18.3 ml}

= 1366.120 g/mL.

Therefore, the density (rho) of the rock is  1366.120 g/mL.

8 0
2 years ago
Draw a structural formula for the alkene you would use to prepare the alcohol shown by hydroboration/oxidation.
Nastasia [14]

Answer:

See explanation

Explanation:

The question is incomplete because the image of the alcohol is missing. However, I will try give you a general picture of the reaction known as hydroboration of alkenes.

This reaction occurs in two steps. In the first step, -BH2 and H add to the same face of the double bond (syn addition).

In the second step, alkaline hydrogen peroxide is added and the alcohol is formed.

Note that the BH2 and H adds to the two atoms of the double bond. The final product of the reaction appears as if water was added to the original alkene following an anti-Markovnikov mechanism.

Steric hindrance is known to play a major role in this reaction as good yield of the anti-Markovnikov like product is obtained with alkenes having one of the carbon atoms of the double bond significantly hindered.

5 0
2 years ago
Which statement defines dynamic equilibrium? (5 points)
Shalnov [3]

Answer:

1. A state of balance in which the rates of the forward and reverse reactions are equal.

Explanation:

A dynamic equilibrium is like a cycle, the reactants change to products, but the products also change to reactants keeping the amount of each constant.

2. A state of balance in which the forward reaction stops but reverse reaction continues.

In this statement there isnt a equilibrium. The products will change to reactants until the reaction stops.

3. A state of balance in which the forward reaction continues but reverse reaction stops.

Here the reactants will change to products until the reaction stops.

4. A state of balance in which the forward and reverse reactions stop.

In this case the reaction has stopped.

4 0
3 years ago
If you pump air into cycle tyre a slight warming effect is noticed at valve stem why
SSSSS [86.1K]
Probably the kinetic energy of rubbing the pump against the valve, combined with the increase in gas pressure in the tire itself.
8 0
3 years ago
Other questions:
  • The layering of eroded sediments is called:
    12·1 answer
  • What happens to the event horizon when a larger star “dies”?
    10·1 answer
  • What is the main cause of global conversation currents
    15·1 answer
  • How many different elements are in nine substances
    6·1 answer
  • Which electromagnetic wave has the highest frequency?
    9·2 answers
  • Plzz help guysss!! <br>How long would it take you to travel 8 miles at a speed of 1 mile per hour?​
    6·1 answer
  • Whichstatement describes a question that can be answered by a scientific investigation
    11·1 answer
  • Balance the equation
    11·1 answer
  • Busca información acerca de si las siguientes sustancias son simples o
    7·1 answer
  • The pressure of a sample of gas is measured at sea level with an open-end mercury manometer, and the liquid level is 13.7 cm hig
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!