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Oksanka [162]
3 years ago
11

In a car engine gasoline is burning to create mechanical energy which of the following statements is true? A. Some energy is los

t as heat B. the total amount of energy in the system increases C. the total amount of energy in the system degrees D. the nuclear energy is transformed into mechanical energy​

Chemistry
1 answer:
Anvisha [2.4K]3 years ago
4 0

Answer:

Some energy is lost as heat

Explanation:

It is correct to say that as the gasoline is converted to mechanical energy in the automobile engine, some of the energy is lost as heat.

Heat energy is on of the ways energy is lost in any system. The movement of mechanical parts and even the combustion of the gasoline produces heat energy.

These energy are usually lost to the environment.

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How many moles of water can be produced by reacting 525 liters of oxygen with excess hydrogen
Ann [662]
I believe the answer is 16
3 0
2 years ago
4. Using your knowledge of elements, compounds
igor_vitrenko [27]

Answer:

Element

magnesium, hydrogen, chlorine, sulfur

Compound

water, iron oxide

Mixture

air, salty water , dias cola.

Explanation:

Element is made up of only one type of atom and are relresented by symbols.

Compound are formed by chemical mixing of atoms of elements and have a chemical formula

Mixture are formed by simple mixing up of substances and mixture don't have chemical formula.

4 0
2 years ago
How much energy must be supplied to break a single 21Ne nucleus into separated protons and neutrons if the nucleus has a mass of
love history [14]

Answer:

1)There is 2.68 * 10^-11 J of energy needed

2) The nuclear binding energy for 1 mol of Ne is 1.6 *10^13 J/mol

Explanation:

Step 1: Data given

The nucleus of a21Ne atom has a amass of 20.98846 amu.

Step 2: Calculate number of protons and neutrons

The number of electrons and protons in an 21Ne atom = 10

The number of neutrons = 21 -10 =11

Step 3: mass of the atom

Mass of a proton = 1.00727647 u

Mass of a neutron = 1.0086649 u

The mass of the atom = mass of all neutrons + mass of protons

Mass of atom = 11*1.0086649 + 10*1.00727647  = 21.1680786 amu

Step 4: Calculate change of mass

The change in mass = Mass of atom - mass of neon

Δmass = 21.1680786 - 20.98846

Δmass = 0.1796186

Step 5: Calculate mass for a single nucleus

The change of mass for a single nucleus is = Δmass / number of avogadro

Δmass of nucleus = 0.1796186 / 6.022*10^23

Δmass of nucleus =2.98 * 10^-25 grams = 2.98 * 10^-28 kg

Step 6: Calculate energy to break a Ne nucleus

Calculate the amount of energy to break a Ne nucleus

ΔEnucleus = Δmass of nucleus * c²

⇒ with c = 2.9979 *10^8 m/s

ΔEnucleus = 2.98 * 10^-28 kg * (2.9979*10^8)² = 2.68 * 10^-11 J

What is the nuclear binding energy for 1 mol of Ne?

ΔE= ΔEnucleus * number of avogadro

ΔE= 2.68 * 10^-11 J * 6.022*10^23

ΔE= 1.6 *10^13 J/mol

3 0
3 years ago
Another term sometimes used for the celsius scale
chubhunter [2.5K]

Answer:

Explanation:

Centigrade

5 0
2 years ago
What’s the formula for Lithium acetate
notsponge [240]

Answer:

The formula for lithium acetate is CH3COOLi

Explanation:

The formula for lithium acetate is obtained by replacing the hydrogen atom bonding to the oxygen atom in acetic acid with Li as shown below:

CH3COOH + LiOH —> CH3COOLi + H2O

5 0
3 years ago
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