2 years ago

Which of the following suggests that a physical change has taken place in an ice cube

Chemistry

1 answer:

zaharov [31]2 years ago

7 0

The melting of the ice cube indicates physical change has taken place

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The element californium (cf) sells for $1000 per µg. assuming 6.02 x 1023 atoms of cf have a mass of 251 grams, how many atoms o

saveliy_v [14]

Answer:- $2.40*10^1^0atoms$

Solution:- It is a simple unit conversion problem. We could solve this using dimensional analysis.

We know that, 1 US dollar = 100 cents

1 cent = 1 US penny

So, 1 US dollar = 100 US pennies

$1g=10^6\mu g$

Let's make the set up starting with 1 penny as:

$1penny(\frac{$1}{100pennies})(\frac{1\mu g}{$1000})(\frac{1g}{10^6\mu g})(\frac{6.02*10^2^3atoms}{251g})$

= $2.40*10^1^0atoms$

Therefore, we can bye $2.40*10^1^0atoms$ of Cf in one US penny.

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2 years ago

An element has a half-life of 30 years. if 1.0 mg of this element decays over a period of 90 years, how many mg of this element

labwork [276]

Answer:

144.6

Explanation:

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2 years ago

Which of these elements is the most reactive

mr_godi [17]

Answer:

What elements?

Explanation:

The alkali metals are softer than most other metals. Cesium and francium are the most reactive elements in this group. Alkali metals can explode if they are exposed to water.

Not sure if this what you were talking about but here

This from google btw not gonna lie

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2 years ago

a solar eclipse only happens during a Moon

stepan [7]

Answer:

A. New

Explanation:

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What does quantities data mean?

aliina [53]

Data that can be measured, deals with numbers and length,height,area,volume etc.

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3 years ago