3 years ago

Explain how medeleeves periodic table differs from mosley

1 answer:

7 0

Answer: Mendeleev's periodic law was that the properties of elements varies periodically with the atomic weight. Moseley's periodic law or modern periodic law is that the properties of elements are periodic function of their atomic number

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Match each number to how it would appear in scientific notation.

Verdich [7]

A. 8,330 --> 8.33 × 10^3
B. 83.3 --> 8.33 × 10^1
C. 0.00833 --> 8.33 × 10^-3
D. 0.0833 --> 8.33 × 10^-2
E. 83,330 --> 8.33 × 10^4

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4 0

3 years ago

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A cubic object has a volume of 250 cm. What is its density if its mass is 5 points<br> 257.3 g?

ira [324]

Answer:

<h3>The answer is 1.03 g/cm³</h3>

Explanation:

The density of a substance can be found by using the formula

$density = \frac{mass}{volume} \\$

From the question

mass = 257.3 g

volume = 250 cm³

We have

$density = \frac{257.3}{250} \\ = 1.0292$

We have the final answer as

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3 years ago

Use the following chemical equation to answer the question. 4K(s) + O2(g) → 2 K2O(s). If a staff member at a laboratory has 12.0

Allushta [10]

Answer:14.5 grams of K2O

Explanation:

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3 years ago

Xà phòng hóa hoàn toàn 17,6 gam hỗn hợp 2 este là etyl axetat và metyl propionat bằng lượng vừa đủ V (ml) dung dịch Na0H 0,5M. V

Igoryamba

Answer:

0,5m

Explanation:

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3 years ago

A surface wave is a combination of what two waves

Alika [10]

transverse wave and a longitudinal wave

Hope it helps have a blessed day!:)

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4 years ago

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