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
bixtya [17]
3 years ago
14

According to the big bang theory, which describes the universe before the actual big bang occurred? Multiple, cold, dense points

, each larger than the sun multiple, hot, dense points, each smaller than an atom single, cold, dense points larger than the sun single, hot, dense points smaller than an atom
Chemistry
1 answer:
atroni [7]3 years ago
7 0

Answer:

The correct answer is hot, dense points; each smaller than an atom

Explanation:

The big bang theory was proposed to suggest the expansion of the universe by describing the origin of all components of the universe and it's planetary bodies. It suggested that the <u>whole universe was in a state of high temperature and highly dense points (which were smaller than atoms) but continuously expanded by cooling down which gave rise to the formation of subatomic particles, atoms</u> e.t.c.

You might be interested in
is anyone willing to help me finish the last 10 pages of a chemistry packet(grade 11)? can offer money
aleksandr82 [10.1K]

Answer:

maybe

Explanation:

5 0
3 years ago
Calculate the volume of 0.10 g of titanium (4.51 g/cm³).
Juli2301 [7.4K]

The volume of titanium with mass of 0. 10g and density of 4. 51 g/cm³ is 0. 02 cm³

<h3>What is volume?</h3>

Volume is known to be equal to the mass divided by the density.

It is written thus:

Volume = Mass / density

<h3>How to calculate the volume</h3>

The volume is calculated using the formula:

Volume = mass ÷ density

Given the mass = 0. 10g

Density = 4.51 g/cm³

Substitute the values into the formula

Volume of titanium = 0. 10 ÷ 4.51 = 0. 02 cm³

Thus, the volume of titanium with mass of 0. 10g and density of 4. 51 g/cm³ is 0. 02 cm³

Learn more about volume here:

brainly.com/question/1762479

#SPJ1

4 0
3 years ago
The compound calcium cyanamide (CaNCN) is used as a nitrogen source for crops. To obtain this compound, calcium carbide is react
fenix001 [56]
N2 + CaC2 = CaNCN + C 
<span>As you can see, 1 mol of N2 can react completely with 1 mol of CaC2 and 1 mol of CaNCN will be obtained </span>
<span>It means 5 mol of N2 can react completely with 5 mol of CaC2 and 5 mol of CaNCN will be obtained </span>

<span>So, there are 7.5 - 5 = 2.5 odd mole of CaC2 after the reaction </span>
<span>And the mass of obtained CaNCN is </span>
<span>m = n*M = 5*80 = 400g</span>
4 0
4 years ago
A student dissolves 15.0 g of ammonium chloride(NH4Cl) in 250. 0 g of water in a well-insulated open cup. She then observes the
iren2701 [21]

Answer:  

1) Endothermic.  

2) Q_{rxn}=4435.04J  

3) \Delta _rH=15.8kJ/mol

Explanation:  

Hello there!  

1) In this case, for these calorimetry problems, we can realize that since the temperature decreases the reaction is endothermic because it is absorbing heat from the solution, that is why the temperature goes from 22.00 °C to 16.0°C.  

2) Now, for the total heat released by the reaction, we first need to assume that all of it is released by the solution since it is possible to assume that the calorimeter is perfectly isolated. In such a way, it is also valid to assume that the specific heat of the solution is 4.184 J/(g°C) as it is mostly water, therefore, the heat released by the reaction is:

Q_{rxn}=-(15.0g+250.0g)*4.184\frac{J}{g\°C}(16.0-20.0)\°C\\\\ Q_{rxn}=4435.04J    

3) Finally, since the enthalpy of reaction is calculated by dividing the heat released by the reaction over the moles of the solute, in this case NH4Cl, we proceed as follows:

\Delta _rH=\frac{ Q_{rxn}}{n}\\\\\Delta _rH= \frac{ 4435.04J}{15.0g*\frac{1mol}{53.49g} } *\frac{1kJ}{1000J} \\\\\Delta _rH=15.8kJ/mol

Best regards!  

Best regards!

4 0
3 years ago
What ions make up the ionic compound FeCrO4 ?
aksik [14]

Answer:

metals and nonmetals

Explanation:

that's your answer have a nice day

3 0
3 years ago
Other questions:
  • How much energy does a photon of frequency 6 x 1012 Hz have?
    12·1 answer
  • Which equation best expresses the relationship between pressure and volume for gas?
    8·2 answers
  • How many moles are in 1.2 x 10 ^ 3 grams of ammonia
    5·1 answer
  • Lithium salts contain a lithium atom that is missing one valence electron (and therefore bears a positive charge). Choose the co
    8·2 answers
  • Peter ate junk food at breakfast and worried about the examination, which combined to give him an annoying case of acid indigest
    5·1 answer
  • NEED HELP ASAP PLEASE HELP
    11·1 answer
  • What sources or bodies of water are included in the Earth's water cycle? A. All water on Earth and in Earth's atmosphere is incl
    6·2 answers
  • 0.0721 moles of a compound have a mass of 31.008 grams. What is the molar mass?
    7·1 answer
  • What time of the year can you see Scorpius
    8·2 answers
  • mass of 2 * 10^21 number of atoms of an element is 0.4g. what is the mass of 0.5 mole of the element?​
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!