Quartz,SiO2,contains 46.7% silicon. What mass of silicon is present in 381 g of quartz?

Mori walks into a restaurant. Upon smelling the food cooking, her mouth starts to water. Which system in the body detected the i

VLD [36.1K]

Answer:

Digestive system

6 0

2 years ago

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Describe the changes in properties (from metals to nonmetals or from nonmetals to metals) as we move (a) down a periodic group a

defon

Answer:

Explanation:

The changes in properties from metals to non-metals on a periodic table can be measured and determined by the metallicity or electropositivity of elements.

Metallicity is a measure of the tendency of atoms of an element to lose electrons.

a.

Down a periodic group, metallicity increases.

b.

Across a period from left to right electropositivity or metallicity decreases.

Metals are found in the left part of periodic table and the most reactive metal sits in the lower left corner. Non-metals are towards the right side of the table.

7 0

2 years ago

Nicole has 2 glasses on the counter: one of water and one of sugar. She is baking a cake and needs to use the sugar-water for th

Schach [20]

Answer:It is a mixture

Explanation:

If it is pure sugar it’s neither but if it has water it is a homogeneous mixture

8 0

1 year ago

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How many atoms of S are in 98.0 grams of hydrosulfuric acid?

noname [10]

<h2>Answer: $6.022\times 10^{23}$ </h2>

Explanation:

The formula for sulphuric acid is $H_{2}SO_{4}$ .

Molecular mass of sulphuric acid is $2(2)+32+16(4)=98g$

$given weight=98g$

Number of moles of sulphuric acid given is $\frac{\text{given weight}}{molar mass}$ = $\frac{98}{98}=1$

The formula indicates that one mole of $H_{2}SO_{4}$ contains $2$ moles of $H$ atoms, $1$ mole of $S$ atoms, $4$ moles of $O$ atoms.

So,the compound contains $1$ mole of sulphur atoms.

$1$ mole of sulphur has $6.022\times 10^{23}$ atoms

7 0

2 years ago

IF you’ve eaten 45% of a box of chocolate cereal that has 13oz when you buy it how many oz of the cereal have you eaten

weqwewe [10]

To determine the number of ounces of the chocolate cereal that you have eaten, the operation that needs to be performed is simply the multiplication of the initial number of ounce in the box of cereal and the decimal equivalent of the given percentage. If we let n be the answer,

n = (13 oz)(0.45)

Simplifying, this will give us the answer which is equal to 5.85 oz.

<em>Answer: 5.85 oz. </em>

6 0

2 years ago