CHEMISTRY HIGH SCHOOL

The ___________________ in the mouth secrete enzymes which help prepare the food for digestion in the stomach.a. teeth
B.tongue
C.salivary glands
D.pancreas

Answers

Answer 1

Answer:

The salivary glands in the mouth secrete enzymes which help prepare the food for digestion in the stomach.

Answer 2

Answer:

Answer: salivary glands

Explanation:

this is the correction i got 100% correct

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Give the names of three exothermic and 3 endothermic processes?
Which statement correctly describes a solution with a pH of 9?(1) It has a higher concentration of H3O+ than OH– and causes litmus to turn blue.(2) It has a higher concentration of OH– than H3O+ and causes litmus to turn blue.(3) It has a higher concentration of H3O+ than OH– and causes methyl orange to turn yellow.(4) It has a higher concentration of OH– than H3O+ and causes methyl orange to turn red.
What would the molecular formula be if lithium and sulfur reacted to form a neutral compound?A. LiSB. LiS2C. Li2S2D. Li2S

The pressure the gas exert the walls of the container will decrease because the gas particles hit the wall of the container

Answers

The statement is false. The pressure of a gas do not decrease as the gas molecules hit the walls of the container. According to the Kinetic Molecular Theory, collisions of the gas molecules or with the walls of the container are perfectly elastic. This means that energy is not lost as the molecules collide with each other or with the walls of the container.

Which equation represents the total ionic equation for the reaction of HNO3 and NaOH?

Answers

Answer: H⁺(aq) + NO₃⁻(aq) + Na⁺(aq) + OH⁻(aq) —> NO₃⁻(aq) + Na⁺(aq) + H2O(l)

Explanation:

1) The first step is understand the nature of the reactants and the kind of reaction that they carry on:

HNO₃ is an acid (nitric acid) and NaOH is a base (sodium hydroxide).

So, this is an acid base reaction, which is a double replacement reaction, whose result is a salt and water.

2) It is also helpful writing the molecular equation. And you should include the phases. This is:

HNO₃(aq) + NaOH(aq) --> NaNO₃(aq) + H₂O(l)

3) Next, you should separate each ionic compound into its ions. This is:

HNO₃(aq) = H⁻(aq) + NO₃⁺(aq), and

NaOH = Na⁺(aq) + OH⁻(aq)

4) Write the reactant side in the form of ions:

H⁺(aq) + NO₃⁻(aq) + Na⁺(aq) + OH⁻(aq) →

5) write the product side: H+ + OH- form water and the other two ions,.althoug form the sal, if are soluble remain as ions in the solution.

NO₃⁻(aq) + Na⁺(aq) + H2O(l)

6) Write both sides:

H⁺(aq) + NO₃⁻(aq) + Na⁺(aq) + OH⁻(aq) —> NO₃⁻(aq) + Na⁺(aq) + H2O(l)

And this last one is the total ionic equation.

Answer: The net ionic equation is written below.

Explanation:

Net ionic equation of any reaction does not include any spectator ions.

Spectator ions are defined as the ions which does not get involved in a chemical equation. They are found on both the sides of the chemical reaction when it is present in ionic form.

The chemical equation for the reaction of nitric acid and sodium hydroxide is given as:

$HNO_3(aq.)+NaOH(aq.)\rightarrow NaNO_3(aq.)+H_2O(l)$

Ionic form of the above equation follows:

$H^+(aq.)+NO_3^-(aq.)+Na^+(aq.)+OH^-(aq.)\rightarrow Na^+(aq.)+NO_3^-(aq.)+H_2O(l)$

As, sodium and nitrate ions are present on both the sides of the reaction. Thus, it will not be present in the net ionic equation and are spectator ions.

The net ionic equation for the above reaction follows:

$H^+(aq.)+OH^-(aq.)\rightarrow H_2O(l)$

Hence, the net ionic equation is written above.

When are atoms considered stable?when they have satisfied the law of conservation of mass naturally or through bonding to obtain
full valence shells

when they have satisfied the octet rule naturally or through bonding to obtain full valence shells

when their valence electrons have "fallen" back to ground state through bonding

Answers

Answer:

when they have satisfied the octet rule naturally or through bonding to obtain full valence shells

Explanation:

Generally, most atoms of an element are unstable because they have a void in their electron shell to fill, hence, they need to react with other elements to fulfil this task of octet.

Octet rule states that atoms of elements engage in reactions to form compounds so they can have eight (8) valence electrons in their shell. Noble gases e.g argon, neon etc. are elements that have naturally satisfied this octet rule by possession of 8 valence electrons in their shell. Other elements that do not have this naturally becomes reactive and enter bonding with other atoms to obtain full valence shells.

In Rutherford’s gold foil experiment, many of the alpha particles passed straight through the gold foil, completely undeflected. What did Rutherford conclude from this observation? A. Alpha particles have a positive charge.

B. Electrons have a negative charge.

C. An atom is made up of mostly empty space.

D. There is a dense area within an atom that has a negative charge.

Answers

Answer: C

Explanation:

Rutherford's Gold Foil Experiment

These were his conclusions.

Aimed beam of alpha particles at a thin piece of gold foil and found most of the particles passed through the gold foil without being scattered, except for a few particles.
He found the volume of an atom is mostly empty space.
He proposed there is a heavy, positively charged body at the center of each atom that contains most of the mass.
Electrons are throughout the atom.
Number of electrons outside the nucleus equals the number of protons in the nucleus. Atom is electrically neutral.

Which element is most chemically similar to chlorine?
Ar
F
Fr
S