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2 years ago

What is called a measurement and does involve a number and unit in chemistry?

Chemistry

1 answer:

marta [7]2 years ago

3 0

Answer:

1.1: Taking Measurements. Chemists measure the properties of matter and express these measurements as quantities. A quantity is an amount of something and consists of a number and a unit. The number tells us how many (or how much), and the unit tells us what the scale of measurement is.

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7. Propane, C₂H₁, has become a popular gas to use in fireplaces.

kramer

Answer:

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8 0

2 years ago

Liquid sodium is being considered as an engine coolant. How many grams of liquid sodium (minimum) are needed to absorb 1.30 MJ o

Sunny_sXe [5.5K]

Answer:

97 000 g Na

Explanation:

The absortion (or liberation) of energy in form of heat is expressed by:

q=m*Cp*ΔT

The information we have:

q=1.30MJ= 1.30*10^6 J

ΔT = 10.0°C = 10.0 K (ΔT is the same in °C than in K)

Cp=30.8 J/(K mol Na)

If you notice, the Cp in the question is in relation with mol of Na. Before using the q equation, we can find the Cp in relation to the grams of Na.

To do so, we use the molar mass of Na= 22.99g/mol

$Cp= \frac{30.8J}{K*mol Na}*\frac{1 mol Na}{22.99 g Na}=1.34\frac{J}{K*g Na}$

Now, we are able to solve for m:

$m=\frac{1.30*10^6 J}{1.34\frac{J}{K*g Na} *10.0K}=\frac{1.30*10^6J}{13.4\frac{J}{g Na} } = 9.70*10^4 g Na=97 Kg Na$ =97 000 g Na

7 0

3 years ago

Read 2 more answers

What is a good essential question for the subject molecular compounds

Mashutka [201]

Why do molecules combined into chains?

6 0

3 years ago

5.82 760. Х 425.976 answer should have sig.figs. calculated answer:

Mekhanik [1.2K]

Answer:

2482.4177376

Explanation:

1: 5.82 760 times 425.976

2: You will find the answer that is 2482.4177376

Hope this helps.

7 0

3 years ago

How many fluorine atoms bond with calcium to form calcium fluoride? one two three four five

Elena-2011 [213]

Calcium fluoride.
Ca is metal, F is non-metal, so they form ionic bond.
Ca as metal can form only positive ion. Ca in the second group, so the charge of Ca ion is 2+. Ca²⁺
F is in the 17th group, so it has 7 electrons on the last level. It is non-metal, non-metal, so it has negative charge -(8-7)=-1. "8" because on the last level cannot be more than 8 electrons. F-ion is F¹⁻.

Ca²⁺ F¹⁻
Number of positive charges should be equal to number of negative charges,
Formula of calcium fluoride
CaF2.
2 atoms Fluorine bond with Calcium.

7 0

3 years ago

What is called a measurement and does involve a number and unit in chemistry?​

What is called a measurement and does involve a number and unit in chemistry?