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Assoli18 [71]
4 years ago
14

Which symbol(s) represent SI units for temperature? Check all that apply.

Chemistry
2 answers:
Arisa [49]4 years ago
6 0
I think its the first 1 C i remember answering this question on my school work

miss Akunina [59]4 years ago
6 0

Answer : The correct option is, K

Explanation :

S.I : It is known as the international System of Units. It is defined as a scientific method that express the magnitude of the several basics units.

As we know that there are seven basic units in the system from which the other units are derived.

The seven base unit used are, meter for length, kilogram for mass, second for time, ampere for current, kelvin for temperature, mole for amount of substance and candela for intensity.

As per question, the symbol represent S.I unit for the temperature is, Kelvin which is denoted as, (K).

Hence, the correct option is, K

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A compound made of two elements, iridium (Ir) and oxygen (O), was produced in a lab by heating iridium while exposed to air. The
natima [27]
1) Compund Ir (x) O(y)

2) Mass of iridium = mass of crucible and iridium - mass of crucible = 39.52 g - 38.26 g = 1.26 g

3) Mass of iridium oxide = mass of crucible and iridium oxide - mass of crucible = 39.73g - 38.26g = 1.47g

4) Mass of oxygen = mass of iridum oxide - mass of iridium = 1.47g - 1.26g = 0.21g

5) Convert grams to moles

moles of iridium = mass of iridium / molar mass of iridium = 1.26 g / 192.17 g/mol = 0.00656 moles

moles of oxygen = mass of oxygen / molar mass of oxygen = 0.21 g / 15.999 g/mol = 0.0131

6) Find the proportion of moles

Divide by the least of the number of moles, i.e. 0.00656

Ir: 0.00656 / 0.00656 = 1

O: 0.0131 / 0.00656 = 2

=> Empirical formula = Ir O2 (where 2 is the superscript for O)

Answer: Ir O2
5 0
4 years ago
Read 2 more answers
To identify a diatomic gas (X2), a researcher carried out the following experiment: She weighed an empty 4.6-L bulb, then filled
snow_tiger [21]

Answer:

The chemical formula of the gas is N_2.

Explanation:

The difference between the container with gas and empty container is equal to the mass of the gas.

Let the gas be X_2

Mass of the gas = m

Molar mass of diatomic gas = M

Pressure of the gas = P = 1.80 atm

Volume of the gas = V = 4.6 L

Temperature of the gas= T = 27.0 C = 27.0 + 273 K = 300 K

Moles of diatomic gas = n = \frac{m}{M}

Using ideal gas equation:

PV=nRT

PV=\frac{m}{M}RT

M=\frac{mRT}{PV}=\frac{9.5 grams \times 0.0821 atm L/mol K\times 300 K}{1.80 atm\times 4.6 L}=28.26 g/mol\approx 28 g/mol

Atomic mass of the element X = \frac{28 g/mol}{2}=14 g/mol

The element is nitrogen and the diatomic gas is N_2.

5 0
3 years ago
Someone please help fast!!!please
Crank

Answer:

7276783

Explanation:

8765467

4 0
3 years ago
The correct number of significant figures in the following measurement is: 0.0760100 x 10^3
tester [92]

Answer:

4

Explanation:

7.60100, but we count as significant figures only the 0s b/n non-zero numbers

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4 years ago
Elements that have some properties of metals and some properties of nonmetals
GalinKa [24]

Answer:

metalloids aka semimetals

Explanation:

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