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DochEvi [55]
3 years ago
11

People have developed models of the universe for thousands of years. Identify two observations that a model of the universe woul

d need to explain in order to be useful
Chemistry
1 answer:
ella [17]3 years ago
4 0
It It would both need to show and explaine the universe
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Part b select the ester that is formed when propanoic acid reacts with isopropyl alcohol in the presence of heat and an acid cat
Otrada [13]
<span>The ester that is formed by combining propanioc acid with isopropyl alcohol, using heat and an acid catalyst is isopropyl propanoate.</span>
7 0
4 years ago
If you try to place the compound on the pan over the flame, what could possibly happen? Explain your answer. [2 marks] anyone pl
Scilla [17]

Answer:

it will probably flame up or explode or maybe start boiling

8 0
3 years ago
Complete the table to summarize the properties of the different subatomic particles. Type in your answers.
Aloiza [94]

<h2>Complete the table to summarize the properties of the different subatomic particles. </h2>

Explanation:

Atom

It is a smallest particle which cant exist independently.

According To Dalton, atom was indivisible but later on, it was proved that atom can be subdivided into sub atomic particles called electron, proton & neutron.

These subatomic particles have marked properties .

Proton

  • It was discovered by E.Goldstein .
  • It is positively charged particle
  • It is present in nucleus .
  • Its mass is equal to 1.6726219 × 10⁻²⁷ kilograms

Neutron

  • It was discovered by E.chadwick .
  • It is neutral
  • It is present inside the nucleus .
  • It's mass is equal to 1.674927471×10⁻²⁷ kg

Electron

  • It was discovered by J.J Thomson .
  • It has negative charge .
  • It's mass is equal to 9.10938356 × 10⁻³¹ kilograms
  • It is present outside the nucleus in shells .
4 0
3 years ago
Read 2 more answers
Is the bond length in HCl the same as that in DCl? The wavenumbers of the J = 0  1 rotational transitions for H35Cl and 2H35Cl
konstantin123 [22]
I’m sorry i do not know
4 0
3 years ago
PLEASE HELP ME ASAPPPPP What is the density of a piece of cardboard that has a mass of 250 g and volume of 46 mL? *
Roman55 [17]

Answer:

The answer is

<h2>5.43 g/mL</h2>

Explanation:

The density of a substance can be found by using the formula

density =  \frac{mass}{volume}  \\

From the question

mass = 250 g

volume = 46 mL

The density is

density =  \frac{250}{46}  \\  = 5.4347826...

We have the final answer as

<h3>5.43 g/mL</h3>

Hope this helps you

6 0
3 years ago
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