Answer:
A
Explanation:
A chemical change is when a new substance is created, which often has its own chemical properties, so A is the correct answer.
Answer:
D.
Explanation:
The weighted average of the masses of the isotopes.
A rain gauge<span> (also known as an udometer, pluviometer, or an ombrometer) is an instrument used by meteorologists and hydrologists to gather and measure the amount of liquid precipitation over a set period of time.
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Answer:
The new volume of the gas is 70 mL (option A)
Explanation:
Step 1: Data given
Volume of the gas = 93 mL = 0.093 L
Temperature = 91 °C = 364 K
The temperature is reduced to 0°C = 273 K
The pressure doesn't change
Step 2: Calculate the new volume of the gas
V1/T1 = V2/T2
⇒with V1 = the initial volume of the gas = 0.093 L
⇒with T1 = the initial temperature of the gas = 364 K
⇒with V2 = the new volume = TO BE DETERMINED
⇒with T2 = the reduced temperature = 273 K
0.093L/364K = V2/273 K
V2 = 0.06975 L = 69.75 mL ≈ 70 mL
The new volume of the gas is 70 mL (option A)
Answer:
Atomic Number
Neutral atoms of an element contain an equal number of protons and electrons. The number of protons determines an element's atomic number (Z) and distinguishes one element from another.
Explanation: