1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
alexira [117]
3 years ago
13

In which step of the four-stroke engine cycle does the spark plug initiate the combustion reaction?

Chemistry
2 answers:
Doss [256]3 years ago
8 0
<h2>Answer:</h2>

Combustion stroke is the step at which four-stroke engine cycle sparks plug initiate the combustion reaction.

<h3>Explanation:</h3>
  • Combustion or ignition is known as the burning of fuel in the presence of air.
  • Combustion stroke is the third stroke in four-stroke engine .
  • In this stroke the compressed air-fuel mixture is sparked by a spark plug (in a gasoline engine) and by heat generated by high compression (diesel engines).
Dominik [7]3 years ago
4 0
ANSWER
Power stroke

EXPLANATION

At the power stroke stage, the piston is forced to move down by the expanding gases as both intake valve and exhaust valve are closed.
A spark from the spark plug contributes to ignition of the compressed fuel air mixture to released energy to perform work.
You might be interested in
Describe the importance of the nervous system:
elena-14-01-66 [18.8K]

Answer:

So you can feel the things outside of your body

Explanation:

?

3 0
3 years ago
Read 2 more answers
In each of the following sets of elements, which one will be least likely to gain or lose electrons?
klasskru [66]
1. The reactivity among the alkali metals increases as you go down the group due to the decrease in the effective nuclear charge from the increased shielding by the greater number of electrons. The greater the atomic number, the weaker the hold on the valence electron the nucleus has, and the more easily the element can lose the electron. Conversely, the lower the atomic number, the greater pull the nucleus has on the valence electron, and the less readily would the element be able to lose the electron (relatively speaking). Thus, in the first set comprising group I elements, sodium (Na) would be the least likely to lose its valence electron (and, for that matter, its core electrons).

2. The elements in this set are the group II alkaline earth metals, and they follow the same trend as the alkali metals. Of the elements here, beryllium (Be) would have the highest effective nuclear charge, and so it would be the least likely to lose its valence electrons. In fact, beryllium has a tendency not to lose (or gain) electrons, i.e., ionize, at all; it is unique among its congeners in that it tends to form covalent bonds.

3. While the alkali and alkaline earth metals would lose electrons to attain a noble gas configuration, the group VIIA halogens, as we have here, would need to gain a valence electron for an full octet. The trends in the group I and II elements are turned on their head for the halogens: The smaller the atomic number, the less shielding, and so the greater the pull by the nucleus to gain a valence electron. And as the atomic number increases (such as when you go down the group), the more shielding there is, the weaker the effective nuclear charge, and the lesser the tendency to gain a valence electron. Bromine (Br) has the largest atomic number among the halogens in this set, so an electron would feel the smallest pull from a bromine atom; bromine would thus be the least likely here to gain a valence electron.

4. The pattern for the elements in this set (the group VI chalcogens) generally follows that of the halogens. The greater the atomic number, the weaker the pull of the nucleus, and so the lesser the tendency to gain electrons. Tellurium (Te) has the highest atomic number among the elements in the set, and so it would be the least likely to gain electrons.
7 0
3 years ago
Please help me balance:<br>_NaNO3 + _PbO_ ➡️ Pb(NO3)2 + _Na2O
KengaRu [80]

Answer:

The balanced reaction is given by,

2NaN(O)3 + PbO ⇒ Pb(NO3)2 + Na2O

Explanation:

The reaction is as given.

Lets count the number of each elements in the reaction.

<em>In reactant side, number of sodium atoms are 1 , lead are 1, nitrogen are 1 and oxygen are 4.</em>

<em>in product side, number of sodium atoms are 2 , lead are 1 , nitrogen are 2 and oxygen are 7.</em>

<em>So we need to balance sodium and oxygen atoms in the reaction.</em>

<em>There is deficient of sodium and oxygen atoms on reactant side</em>.

Thus, multiply (NaNO3) by 2.

<em>Thus, sodium atoms become 2 , nitrogen 2 and oxygen 6. Total 7 oxygen atoms.</em>

Thus, the balanced reaction is,

2NaN(O)3 + PbO ⇒ Pb(NO3)2 + Na2O

7 0
3 years ago
I need help ASAP
vova2212 [387]

Answer:

1.4 g/cm3

Explanation:

Density = Mass/Volume

Mass = 21g

Volume = 15cm3

Density = 21/15 = 1.4

8 0
3 years ago
a _____ is a new substance formed in a chemical reaction. a. product b. coefficient c. catalyst d. reactant
Svetradugi [14.3K]
A Product is a new substance formed in a chemical reaction
6 0
3 years ago
Read 2 more answers
Other questions:
  • Which of the following statements is not correct?
    6·1 answer
  • Calculate 50g 25.0c to 95.000<br>O.897 J / (g.c)​
    12·1 answer
  • By examining electron domain geometry, one can determine that the ammonia molecule (NH3) has
    10·1 answer
  • Which of the following is the conjugate base of phosphoric acid? *
    7·1 answer
  • Why are numbers used in chemistry often expressed in scientific notation?
    7·1 answer
  • What is it called when particles travel from an area of high consentration to an area of low consentration?
    14·1 answer
  • The table compares the final cost of
    15·1 answer
  • With a well labeled diagram explain the stages of meiosis and mitosis​
    14·1 answer
  • What is chemical change ?​
    5·2 answers
  • Plss help me the question is in the pic
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!