Give the names of three exothermic and 3 endothermic processes?

Answers

Answer 1

Answer: Exothermic processes Endothermic processesmaking ice cubes melting ice cubesformation of snow in clouds conversion of frost to water vaporcondensation of rain from water vapor evaporation of water

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Salt & sugar do not appear to have a fix shape.why do we call them solid

Answers

they do have a fixed shaed because they are crystals. theye are very very tiny, but salt is crystals in the shape of cubes, and sugar has completely irregular crystals. salt can be mined for example - rocks of pure salt are solid, no? :)

Select the correct answer. Which statement describes the acid found in vinegar (acetic acid)? A. It tastes bitter. B. It feels slippery. C. It changes red litmus paper to blue. D. It reacts with Mg to produce H2. E. It releases OH- in a solution.

Answers

Answer: Option (D) is the correct answer.

Explanation:

The acetic acid, $(CH_(3)COOH)$ present in vinegar reacts wit magnesium and therefore, it releases hydrogen gas and magnesium acetate.

The chemical reaction will be as follows.

$2CH_(3)COOH + 2Mg \rightarrow 2Mg(CH_(3)COO) + H_(2)$

An acid is a substance which has pH less than 7 and changes blue litmus red. Acids taste sour as they are acidic in nature and releases hydrogen ions.

Whereas bases have pH greater than 7 and changes red litmus into blue.Bases taste bitter and releases hydroxide ions.

Thus, we can conclude that the statement it reacts with Mg to produce $H_(2)$ best describes the acid found in vinegar (acetic acid).

Answer:

D. It reacts with Mg to produce H2.

A solution is considered basic or alkaline if its pH is _________ 7.A. equal to
B. less than
C. greater than

Answers

C greater than because anthing basic is 8 or up

The molecules CH4 and CH3Cl both have tetrahedral shapes. Why is CH4 nonpolar whereas CH3Cl is polar?

Answers

Both CH4 and CH3Cl have tetrahedral shapes, the presence of a more electronegative atom (chlorine) in CH3Cl leads to an uneven distribution of electron density and gives it a polar nature, whereas CH4 remains nonpolar due to the symmetric distribution of electron density among the identical hydrogen atoms.

The polarity of a molecule is determined by the presence of polar bonds and the molecular geometry of the molecule.

In both CH4 (methane) and CH3Cl (chloromethane), the central carbon atom is surrounded by four other atoms, which gives them a tetrahedral shape.

In CH4, all four surrounding atoms are hydrogen (H) atoms. Hydrogen and carbon have similar electronegativity values, meaning the shared electrons in the carbon-hydrogen bonds are equally attracted to both atoms.

This results in a nonpolar molecule since the electron distribution is symmetrical around the central carbon atom.

In CH3Cl, one of the hydrogen atoms in CH4 is replaced by a chlorine (Cl) atom. Chlorine is more electronegative than carbon, creating an unequal sharing of electrons in the carbon-chlorine bond.

The chlorine atom attracts the shared electrons more strongly, creating a partial negative charge (δ-) on the chlorine and a partial positive charge (δ+) on the carbon.

Know more about methane:

brainly.com/question/12645635

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Because in CH4 the valence electrons of Carbon are being pulled away from the nucleus with the same force (since all hydrogen has the same electronegativity).So charges are equally distributed throughout the atom and the atom is non-polar. In CH3Cl Cl has a different electronegativity than H, so charges aren't equally distributed and therefore the molecule is polar.

What is the best description of the Bohr model of the atom?A.)The atom consists of a positively charged material with negatively charged electrons embedded within it.
B.)The atom consists of a nucleus with electrons orbiting randomly around it.
C.)The atom consists of a nucleus with electrons orbiting at specific energy levels. Absorbed photons cause electrons to jump between energy levels.
D.)The atom consists of a nucleus surrounded by a region containing electrons. Electrons cannot be located exactly within this region, but the probability that they will be found in an area can be stated.

Answers

The best description of the Bohr model of the atom is that the atom consists of a nucleus with electrons orbiting at specific energy levels. Absorbed photons cause electrons to jump between energy levels. The answer is letter C.

How many moles of water will be generated during the combustion of 0.38 moles of methyl alcohol (CH3OH)? 2CH3OH + 3O2 2CO2 + 4H2O

Answers

You already got the balanced equation. So the ratio of mole number is the ratio of the coefficient. Then the ratio of methyl alcohol and water is 2:4=1:2. The water generated is 0.38*2=0.76 mol.

Answer:

0.76 moles

Explanation:

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