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Arte-miy333 [17]
3 years ago
7

Which of the following is NOT a symbol for an element? H Li Pb HF

Chemistry
2 answers:
sp2606 [1]3 years ago
3 0
HF because an element is always a capital then a lowercase letter
ohaa [14]3 years ago
3 0
HF because an element always has a capital letter first then a lowercase.
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A student wants to prepare a solution of cobalt(II) fluoride with a known molarity.
swat32

Answer:

\large \boxed{\text{1.52 g}}

Explanation:

1. Calculate the moles of CoF₂ needed

n = \text{0.100 L} \times \dfrac{\text{0.157 mol}}{\text{1 L}}  = \text{0.0157 mol}

2. Calculate the mass of CoF₂

m = \text{0.0157 mol} \times \dfrac{\text{96.93 g}}{\text{1 mol}}  = \text{1.52 g}\\\\\text{ The student must measure out $\large \boxed{\textbf{1.52 g}}$ of cobalt(II) fluoride}

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3 years ago
What is the mole ratio of oxygen to pentane
Katarina [22]
The answer I got is 8:1 
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Xenon is an element similar to Neon. Its density can be found on the Reference Table. Convert Xenon’s density to scientific nota
Nady [450]

The Scientific Notation of  Xenon’s density : 1.31293 × 10²

<h3>Further explanation</h3>

Scientific Notation consists of 2 parts

1. the first part: the first digit followed by the decimal point

2. The second part: the power of 10 which shows the number of digits after the decimal point

Xenon's density = 131.293

First digit = 1, then we give the decimal point and the next digit

The power of 10 is determined from the number of decimal points moved from the original decimal point

Because we move the decimal point two digits to the left, the power of 10 has the number 2 (10²)

So that the Scientific Notation form becomes:

1.31293 × 10²

8 0
3 years ago
how does the increased salinity of the dead sea due to fertiliser industry impact the microscopic organisms that live there​
polet [3.4K]
The sea is called "dead" because its high salinity prevents macroscopic aquatic organisms, such as fish and aquatic plants, from living in it, though minuscule quantities of bacteria and microbial fungi are present. In times of flood, the salt content of the Dead Sea can drop from its usual 35% to 30% or lower.
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3 years ago
How much heat will be given off when 1500 g of water cools down by 20 C? please help and explain:)))
docker41 [41]

Answer:

126000J

Explanation:

From the question given, we obtained the following information:

M = 1500g

C = 4.2J/g°C

ΔT = 20°C

Q =?

Q= MCΔT

Q = 1500 x 4.2 x 20 =

Q = 126000J

7 0
3 years ago
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