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solmaris [256]
3 years ago
15

Round to 4 significant figures. 0.00238866

Chemistry
2 answers:
Nikitich [7]3 years ago
6 0

Answer:

0.002389

Explanation:

look at the first non-zero digit if rounding to one significant figure

look at the digit after the first non-zero digit if rounding to two significant figures

draw a vertical line after the place value digit that is required

look at the next digit

if it's 5 or more, increase the previous digit by one

if it's 4 or less, keep the previous digit the same

fill any spaces to the right of the line with zeros, stopping at the decimal point if there is one

Assoli18 [71]3 years ago
6 0

Answer:

six

Explanation:

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Do radio waves and microwaves have longer or shorter wavelengths than visible light?
lesya [120]
Radio and microwaves have longer wavelengths than visible light.

If you go take a look at the electromagnetic spectrum, you will be able to see that visible light waves have a higher frequency and a shorter wavelength (10^{-6}).
4 0
4 years ago
What volume of 1.25 M solution is needed to make 250 mL of 0.75 M solution?
zysi [14]

Answer:

V1= 150ml

Explanation:

C1= 1.25, V1=?, C2= 0.75, V2= 250ml

Applying dilution formula

C1V1= C2V2

V1= (0.75×250)/1.25 = 150ml

6 0
3 years ago
Please help , I don't know about big bang I'm sorry
Tresset [83]

1. When our Galaxy was forming why was the center dense?

Answer: <u>Stars are believed to originate as from gas clouds in space. Gravitational forces cause this gas to contract forming a dense center of gravitational force.Eventually this extreme pressure at the center of the star causes nuclear fusion reactions to occur.</u>

2. Why did hydrogen atoms collide in the dense center of the Galaxy?

Answer: <u>Compression would heat the gas to temperatures above 1,000 kelvins. Some hydrogen atoms would pair up in the dense, hot gas, creating trace amounts of molecular hydrogen. The hydrogen molecules would then start to cool the densest parts of the gas by emitting infrared radiation after they collide with hydrogen atoms.</u>

3 0
3 years ago
Radioactive americium-241 is used in household smoke detectors and in bone mineral analysis.
Varvara68 [4.7K]

Answer:

Electrons- 95

Protons- 95

Neutrons-146

Explanation:

An atoms is made up of three fundamental particles; electrons, protons and neutrons,

Americium belongs to the f block in the periodic table. It is an actinide element.

An atom of Am-241 contains 95 protons, 95 electrons and 146 neutrons.

4 0
3 years ago
How many cubic cm^3 would be present in a space that is 5.00 in x 4.00 in x 7.00 in?​
Sliva [168]
Okay so just add all of them up the fine the x and the y and d the times that by the size of yiurn four head
5 0
3 years ago
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