<span>In the laws of mathematics, especially in rounding off digits, you
should take note of the digit following that number no matter how long or short
a number is. If the numberis preceded by numbers between 0-4, the number does
not change. However if its is preceded by numbers between 5-9, add one to the
number. For example, 145698. If it is rounded off to the nearest hundreds,
since 9 is the number after 6, add 1 to 6 and it becomes 145700. If it is
rounded off to the nearest hundred thousands, since 4 is the number after 1,
you do not add, the number stays the same and it becomes 100000</span>
Answers:
Question 1) d. 4 moles
question 2) a. single displacement reaction
question 3) c. 2N2H4 + N2O4 ==>3N2+4H2O
question 4) a. 40 ml alcohol in 100 ml water
Answer is: 31,45%.
mrs₁(C₉H₁₆O₄-<span>azelaic acid) = 12g.
mr</span>₂(C₉H₁₆O₄) = 50g.
ω₂(C₉H₁₆O₄) = 15% = 0,15.
mrs₂(C₉H₁₆O₄) = mr₂·ω₂ = 50g·0,15 = 7,5g.
mrs₃(C₉H₁₆O₄) = mrs₁ + mr₂ = 12g + 7,5g = 19,5g.
mr₃ = mr₂ + mr₂ = 50g + 12g = 62g.
ω₃ = mrs₃÷mr₃ = 19,5g ÷ 62g = 31,45% = 0,3145.
Answer:
a supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation.
Explanation:
simpler definition: It's just a thing that you're willing to define before your experiment begins. You're predicting what'll happen, or what you'll earn through your experiment.
Let's say that you're doing an experiment based on using fertilizer on your plant. Your hypothesis can end up like this, "If I add fertilizer to my garden, then my plants will grow faster."
Please correct me if I'm wrong.
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The answer is "<span>the quantity of heat that is required to raise 1 g of the sample by 1°C (Kelvin) at a constant pressure"</span>