CHEMISTRY HIGH SCHOOL

What is the mass in grams of 1.73 moles CaH2

Answers

Answer 1
Answer: mass in grams = no. of moles multiply by molar mass
molar mass is 42 so by putting value we get 72.66 grams...

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When star A runs out of fuel, it explodes in a supernova and becomes a neutron star. When star B runs out of fuel, it contracts to become a white dwarf. Based on this information which of the following conclusions is most likely true:A. Star A had a larger mass than star BB. For most of its life cycle, star A appeared substantially brighter than star B from earthC. For most of its life cycle, star B appeared substantially brighter than star A from earth
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While out on a hike, you find an unknown mineral. how would test the mineral to find out what it is?

Answers

You can find out what mineral it is when you bring it with you after you hike. You can bring it to a laboratory that specializes on mineral rocks for testing. They know what they should do to find out what it is. Hope this helps. Have a nice day. 

Gasoline is a mixture composed primarily of hydrocarbons such as isooctane, which is also known as 2,2,4-trimethylpentane.Gasoline is assigned a number called an octane rating. Gasoline with an octane rating of 87 performs the same as a mixture that consists of 87% isooctane and 13% heptane.
An alternative fuel, E-85, can be used in some automobiles. This fuel is a mixture of 85% ethanol and 15% gasoline.

State the octane rating of a gasoline sample that performs the same as a mixture consisting of 92% isooctane and 8% heptane.
Identify the functional group in a molecule of ethanol in the alternative fuel E-85.

Answers

Because of the 92% isooctane, the gasoline sample's octane rating is 92.The functional group in ethanol is the hydroxyl group.

He statement "matter can be neither created nor destroyed by chemical means, but it can be changed from one form to another" is the chemical law of A. conservation of matter.
B. atomic disintegration.
(C.) conservation of energy.
D. definite proportions.

Answers

Law of C. conservation of energy states that energy can neither be created nor destroyed, but can be changed from one form to another (such as from potential energy to kinetic energy).

Hope this helps~

common state of matter on earth for tin ,scientist related to tin and color,texture,hardness,smell of tin please help really important please i will be very thank full please

Answers

Tin (Sn), also known as stannum, is a silvery-white to grey solid metal. It is considered to have a smooth texture and a hardness of 1.5 on the Mohr's scale which is very soft. It is also odorless and inert which is why it is used in many packaging. Robert Boyle did studies on the oxidation of tin in the 1600s.

What happens when the kinetic energy of molecules increases so much that electrons are released by the atoms, creating a swirling gas of positive ions and negative electrons?

Answers

the answer is d in this case

Answer:

it's C

Explanation:

What is the three-dimensional shape of the molecule with this Lewis structure?

Answers

Trigonal planar is the three-dimensional shape of the molecule with this Lewis structure. Hence, option C is correct.

What is an electron dot structure?

Lewis dot structures also called electron dot structures are diagrams that describe the chemical bonding between atoms in a molecule.

According to the Lewis structure of formic acid, the carbon atom is a central atom and it has three bond pairs without any lone pair of electrons. In VSEPR theory, the double bond is treated as one bond pair for the prediction of the shape of the molecule.

Hence, formic acid will have a trigonal planar geometry around the carbon atom and tetrahedral geometry around oxygen atom as it has two lone pair and two bond pairs

Hence, option B is correct.

Learn more about electron dot structure here:

brainly.com/question/2141967

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trigonal planar which is answer choice c
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