Which provides evidence to support the big bang theory? A.
the change in carbon dioxide levels in the atmosphere

B.
the composition of the sun

C.
the red-shift of distant galaxies

D.
the magnetization of rocks on the ocean floor

Answers

Answer 1

Answer: A.
the change in carbon dioxide levels in the atmosphere

hope that's right and hope i helped

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Which element is a solid at STP?A. H2B. I2C. N2D. O2
Insulin is a protein that is used by the body to regulate both carbohydrate and fat metabolism. A bottle contains 525 mL of insulin at a concentration of 50.0 mg/mL . What is the total mass of insulin in the bottle?
Measuring how quickly a reactant disappears is one way to measure the ______________of the reaction
35g of HF was prepared by reacting 112g of CaF2 with an excess of H2SO4 calculate the percentage yield

If 21.3 grams of lithium react with excess water, how many liters of hydrogen gas can be produced at 297 kelvin and 1.40 atmospheres?

Answers

Hope it cleared your doubt :)

Which of these pairs of elements have the same number of valence electrons phosphorus (P) and chlorine (Cl)
beryllium (Be) and calcium (Ca)
chlorine (Cl) and helium (He)
oxygen (O) and carbon (C)

Answers

Beryllium (Be) and Calcium (Ca)

In nuclear reactions, which of the following is likely to occur? Some of the mass is converted to energy.
The products can weigh less than the reactants.
There is no loss of mass in the reaction.
a and b

Answers

Answer:

A. Some of the mass is converted to energy.

B.The products can weigh less than the reactants.

Explanation:

Nuclear reaction: A reaction in which a nuclei splits into two or more smaller nuclei of mass less than the reactants ,or two or more nuclei combined together to form heavy nuclei of mass less than the reactants and huge amount of energy released.

Nuclear reactions are of two types

1. Nuclear fission

2.Nuclear fusion

1. Nuclear fusion: A reaction in which two or more lighter nuclei combined together to form heavy nuclei of mass slightly less than the total mass of reactants and a large amount of energy released. Because the difference in mass of reactants and products change into energy .

2.Nuclear fission: A reaction in which a heavy nuclei splits into two or more lighter nuclei of total mass slightly less than the mass of reactant. Because the difference in mass of product and reactant change into energy therefore, a huge amount of energy released during this reaction.

Therefore, Option A and B are correct.

Answer : A. Some of the mass is converted to energy.

B.The products can weigh less than the reactants.

I think it's A and B but I'm not good at chem. I remember being asked a similar question and I believe this is correct.

How might you estimate the minimum temperature

Answers

To estimate for the minimum temperature of a daily forecast of low temperature, the first estimate would be the dew point temperature approximately an hour before the daily high temperature is reached. I hope this helps you on your assignment.

How are earthquake seismograms utilized to locate the epicenter of an earthquake?

Answers

by finding the elapsed time from the first p wave and s wave

505 grams of KOH are required to completely react with 4.50 mole of sulfuric acid. How many moles of products are produced?

Answers

Answer : The moles of products $K_2SO_4$ and $H_2O$ are, 4.50 and 9 moles.

Explanation : Given,

Mass of water = 5.2 g

Molar mass of water = 18 g/mole

Molar mass of $O_2$ = 32 g/mole

The balanced chemical reaction will be,

$2KOH+H_2SO_4\rightarrow K_2SO_4+2H_2O$

First we have to calculate the moles of KOH.

$\text{Moles of }KOH=\frac{\text{Mass of }KOH}{\text{Molar mass of }KOH}$

$\text{Moles of }KOH=(505g)/(56g/mole)=9.018mole$

Now we have to calculate the limiting and excess reactant.

From the balanced reaction we conclude that

As, 1 mole of $H_2SO_4$ react with 2 mole of $KOH$

So, 4.50 moles of $H_2SO_4$ react with $4.50* 2=9$ moles of $KOH$

From this we conclude that, $KOH$ is an excess reagent because the given moles are greater than the required moles and $H_2SO_4$ is a limiting reagent and it limits the formation of product.

Now we have to calculate the moles of products $K_2SO_4$ and $H_2O$ .

From the balanced chemical reaction, we conclude that

As, 1 moles of $H_2SO_4$ react to give 1 moles of $K_2SO_4$

So, 4.50 moles of $H_2SO_4$ react to give 4.50 moles of $K_2SO_4$

and,

As, 1 moles of $H_2SO_4$ react to give 2 moles of $H_2O$

So, 4.50 moles of $H_2SO_4$ react to give $4.50* 2=9$ moles of $H_2O$

Therefore, the moles of products $K_2SO_4$ and $H_2O$ are, 4.50 and 9 moles.

Other Questions

Find the mass of AlCl3 that is produced when 10 g of Al2O3 reacts with 10 g of HCl according to the following equation Al2O3(s) + 6HCl(aq) --> 2AlCl3(aq) + 3H2O(aq) Please select the correct option: A. 16.2 g B. 20.0 g C. 10.0 g D. 6.10 g E. 12.2 g

If the pressure of a 2.00 L sample of gas is 50.0 kPa, what pressure does the gas exert if its volume isdecreased to 20.0 mL?Which equation should you use?V1 V2T1 T2P1V1 = P2V2V1 V₂N1 N2

Are gases affected by gravity?