How many protons does Mg²₊ have?

What was the normal perception of a scientist up until the seventeenth century?

castortr0y [4]

working in a factory to develop new technology wearing a white lab coat working in a laboratory working in the woods to study nature collaborating with groups of peers to discuss ideas

7 0

4 years ago

Etermine the percent yield of the following reaction when 2.80 g of P reacts with excess oxygen. The actual yield of this reacti

Elodia [21]

Answer:

Yield = 66.7%

Explanation:

4P + 5O₂ → 2P₂O₅

P: 31 g/mol

O₂: 32 g/mol

P₂O₅: 142 g/mol

31 g P ____ 1 mol

2.80 g P __ x

x = 0.09 mol P

142 g P₂O₅ ____ 1 mol

3.89 g P₂O₅ ___ y

y = 0.03 mol P₂O₅

In a 100% yield, 4 mol of P produces 2 mol of P₂O₅. 0.09 of P should, therefore, produce 0.045 mol of P₂O₅.

Yield = (0.03 mol / 0.045 mol) x 100

Yield = 66.7%

3 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 kind of energy transformations occur when you hit a coconut with a hammer

hram777 [196]

Answer: I dont really know

Explanation:

3 0

3 years ago

Why do hotspots appear to move in relation to tectonic plates?

Vikentia [17]

Answer:The heat that fuels the hot spot comes from very deep in the planet. This heat causes the mantle in that region to melt. The molten magma rises up and breaks through the crust to form a volcano. While the hot spot stays in one place, rooted to its deep source of heat, the tectonic plate is slowly moving above it.

Explanation:

3 0

3 years ago

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