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3 years ago

How do toothpaste prevent tooth decay?

Chemistry

1 answer:

padilas [110]3 years ago

3 0

Answer:Flouride it creates enamel.

Explanation:

enamel (that's the tooth's hard outer surface) more resistant to acids produced by the bacteria living on the teeth and gums.

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What is the ph of a saturated zinc hydroxide solution

Tanya [424]

<span>Ksp = 1.2 x 10^-17 = [Zn2+] [OH-]^2
Zn(OH)2 <----> Zn2+ + 2OH-
[Zn2+] = x
[OH-] = 2x
1.2 x 10^-17 = (x) ( 2x)^2 = 4 x ^3
x = 1.4 x 10^-6 M
2x = 2.8 x 10^-6 M
pOH = - log 2.8 x 10^-6 = 5.5
pH = 14 - 5.5 =8.5

i think this is it

</span>

8 0

3 years ago

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Fill in the blanks to complete each statement about weathering

Allushta [10]

Answer:

Explanation:

Weathering is the breakdown of rocks into smaller particles called:

sediments

Weathering is the physical disintegration and chemical decay of rocks into smaller fragments to produce sediments. The product of rock weathering is basically sediments. Some of the sediments can be transformed to form soils when they combine with organic matter, water and air.

Physical weathering is when rocks are physically broken into smaller pieces, but the minerals in the rock remain the same.

Physical weathering

Physical weathering is the disintegration of rocks into smaller bits without altering the chemical make up of the minerals. The goal of physical weathering is to expose rock surface to action of chemical weathering.

When a rock is broken down in a way that changes the mineral composition, it is called chemical weathering

chemical weathering

Chemical weathering is the decay of rocks by altering the minerals in a rock.

4 0

4 years ago

Read 2 more answers

fecrIf gas particles start colliding with the walls of their metallic container with increased force, what is their direct effec

Vesnalui [34]

Answer:

Answer: The increase in force will directly effect the pressure exerted by the gas that is high pressure of the gas.

Explanation:

6 0

3 years ago

➔ Which compound has both ionic and covalent bonds? A. Ammonium chloride B. Carbon dioxide C. Ethyl ethanoate D. Sodium chloride

uranmaximum [27]

Answer:

Choice A. Ammonium chloride.

Explanation:

Consider the bonds in each of the four compounds.

<h3>Ammonium chloride</h3>

Ammonium chloride $\rm NH_4Cl$ is an ionic compound. Each

The $\rm {NH_4}^{+}$ and $\rm Cl^{-}$ ions in $\rm NH_4Cl$ are connected with ionic bonds.

What make $\rm NH_4Cl$ special is that its cation $\rm {NH_4}^{+}$ is polyatomic. In other words, each $\rm {NH_4}^{+}$ ion contains more than one atoms. These atoms (one $\rm N$ atom and four $\rm H$ atoms) are connected with covalent bonds. Therefore, $\rm NH_4Cl$ has both ionic and covalent bonds.

<h3>Carbon dioxide</h3>

Carbon dioxide $\rm CO_2$ is a covalent compound. Each $\rm CO_2$ molecule contains two $\rm C=O$ double bonds in total. $\rm CO_2$ molecules have no ionic bond.

<h3>Ethyl ethanoate</h3>

The name "ethyl ethanoate" might sound like the name of a salt (think about sodium ethanoate.) However, in reality, ethyl ethanoate $\rm CH_3COOCH_2CH3$ is an ester. The "ethyl" here refers to the $\rm -OCH_2CH3$ part, originating from ethanol. On the other hand, "ethanoate" refers to the $\rm CH_3C(O)-$ part, which can be obtained from ethanoic acid.

These two parts are connected with a covalent $\rm C-O$ single bond. (The $\rm C$ in ethanoic acid is connected to the $\rm O$ in ethanol.) As a result, there's no ionic bond in ethyl ethanoate, either.

<h3>Sodium chloride</h3>

Sodium chloride $\rm NaCl$ is an ionic compound. Both the $\rm Na^{+}$ ion and the $\rm Cl^{-}$ are monoatomic. While the $\rm Na^{+}$ and $\rm Cl^{-}$ in sodium chloride are connected with ionic bonds, neither $\rm Na^{+}$ nor $\rm Cl^{-}$ contains covalent bond.

3 0

3 years ago

What is the density (g/L) of 5.0 moles of NH3, at 1.18 atm and 25.0°C?

Goryan [66]

The answer will be 4667C

5 0

2 years ago

Read 2 more answers