An object with a mass of 2.0kg accelerates 2.0m/s when an unknown force is applied. what is the amount of force?

Answers

Answer 1

Answer: Force is equal to mass times acceleration. This means that the force applied to the object is 2 kg times 2.0 m/s, which gives you 4 Newtons.

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on the basis of hybrid formation, explain the existence of compounds of column IVA such as CH4 when the elements of column IVA only have two unpaired electrons in normal state

Answers

CH4 compound is formed by sharing of electrons with hydrogen atom. They are bonded by ionic bonds. They undergo sp^3 hybridization.

Explanation:

The group 4A elements have 4 electrons in their valence shell or highest energy orbitals ie 2s^2, 2p^2

They share electrons from other elements thereby stabilising their valence shell and form bonds between them. The bonds can be covalent or ionic. It undergoes sp^3 hybridization.

The four valence electrons of the carbon atom are distributed equally in the hybrid orbitals, and each electron of carbon pairs with an electron of hydrogen atom when the C–H bonds form.

A solid precipitate is formed from the reaction of lead nitrate and sodium chromate. What would be the best method to separate this solid from the solution?

Answers

The correct answer is this one: "C. Filtration." For distillation and evaporation, it would leave the soluble salt behind as well. Filtration refers to the action or process of filtering something.
Here are the choices:
A. Distillation
B. evaporation
C. Filtration
D. Sorting

Explanation:

A precipitate is an insoluble solid that does not dissolve in a chemical reaction or or mixture.

For example, $Pb(NO_(3))_(2) + Na_(2)CrO_(4) \rightarrow PbCrO_(4) + 2NaNO_(3)$

Therefore, the precipitate formed can be separated out by filtration method.

As this method will most suitably extract the precipitate and separate it from the remaining solution.

A group of students performed an experiment to prove the law of conservation of energy. In the experiment, a flask containing water at room temperature was shaken vigorously for a few minutes. The table shows a partial record of the temperature of the water before and after shaking.Experimental Record
Temperature
Before Shaking 20 °C
After Shaking Unknown
What best predicts the unknown temperature? (3 points)

a. Less than 20 °C because the total energy of the system after shaking is lower

b. Greater than 20 °C because the total energy of the system after shaking is higher

c. Less than 20 °C, because the mechanical energy from shaking transforms to thermal energy

d. Greater than 20 °C, because the mechanical energy from shaking transforms to thermal energy

Answers

Answer: The most accurate answer is Option D.

Explanation: It's actually 22 degrees. Energy cannot be created of destroyed, but transferred and transformed to one form or another. The movement of the container, mechanical energy was transferred to the water, as heat energy. Therefore is raised the water temperatures slightly.

In physics and chemistry, the law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time. Energy can neither be created nor destroyed; rather, it can only be transformed or transferred from one form to another.

Were is most of earths water

Answers

Most of the Earth's water is in the Oceans.
I hope this helps.

i agree most of earths water is in the oceans. about 97 percent of water is in the oceans, and about 69 percent is locked up in glaciers and icecaps, mainly in greenland and antarctica.
hope it help you.

How many moles are in 2.0 grams of Na?

Answers

Answer:

Explanation:

Sodium metal has a molar mass of

22.99

2C4H10 + 13O2 -----> 8CO2 + 10H2OIf 3000 grams of C4H10 react according to this equation, and the actual yield for water is a mass of 1300 grams, what is the percent yield?