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3 years ago

. How many electrons are in a neutral atom of an element that has 14 protons and 15 neutrons?

Chemistry

1 answer:

fomenos3 years ago

4 0

Answer:

Explanation:

in a neutral element, there is always an equal number of protons (positive charge) and electrons (negative charge).

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Use dimensional analysis to convert 14.5mi/hr to km/s

Liula [17]

Answer:

0.006 48 km/s

Explanation:

1. Convert miles to kilometres

14.5 mi × (1.609 km/1 mi) = 23.33 km

2. Convert hours to seconds

1 h × (60 min/1h) × (60 s/1 min) = 3600 s

3. Divide the distance by the time

14.5 mi/1 h = 23.3 km/3600 s = 0.006 48 km/s

5 0

4 years ago

In a chemical reaction, sulfur (S8) combines with copper to give a pure compound. If you start with 1.000 g of sulfur (S8) and o

Airida [17]

Answer: The empirical formula for the given compound is $Cu_2S$

Explanation:

We are given:

Mass of pure compound containing copper and sulfur = 4.963 g

Mass of S = 1.000 g

Mass of Cu = (4.963 - 1.000) g = 3.963 g

To formulate the empirical formula, we need to follow some steps:

Step 1: Converting the given masses into moles.

Moles of Copper = $\frac{\text{Given mass of Copper}}{\text{Molar mass of Copper}}=\frac{3.963g}{63.55g/mole}=0.0624moles$

Moles of Sulfur = $\frac{\text{Given mass of Sulfur}}{\text{Molar mass of Sulfur}}=\frac{1.000g}{32g/mole}=0.0312moles$

Step 2: Calculating the mole ratio of the given elements.

For the mole ratio, we divide each value of the moles by the smallest number of moles calculated which is 0.0312 moles.

For Copper = $\frac{0.0624}{0.0312}=2$

For Sulfur = $\frac{0.0312}{0.0312}=1$

Step 3: Taking the mole ratio as their subscripts.

The ratio of Cu : S = 2 : 1

Hence, the empirical formula for the given compound is $Cu_2S$

8 0

3 years ago

What is the pOH of a 1 x 10^-8 M solution of HNO3?

Sedaia [141]

Explanation:

to find POH u need PH first

so ph=-log(h3o)

$ph = - log(1 \times {10}^{ - 8} ) \\ \\ ph = 8 \\ ph + poh =14 \\ poh = 14 - 8 \\ poh = 6$

8 0

3 years ago

Sodium chloride (table salt,) whose formula is NaCl: Ionic Covalent

Vesna [10]

Since sodium chloride contains both a metal AND a nonmetal, the combination of those would result in an ionic bond.

7 0

3 years ago

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The basic living unit of all organisms is the- A. Organ B. Tissue C. Organ System D. Cell

777dan777 [17]

Answer:

D:Cells

Explanation:

A cell is a the smallest unit of a living thing. A living thing whether made up of one cell which is Bacteria and a living thing whether made up of many cells which is Humans

5 0

3 years ago

Read 2 more answers