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jok3333 [9.3K]
3 years ago
13

I need help please and give me an explanation

Chemistry
1 answer:
jeyben [28]3 years ago
5 0
Column 1 because it has 1/8 valence electrons and alkaline metals are reactive
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Earth is currently 150 million km away from the Sun. If Earth was 200 million km away from the Sun, why would it no longer be ab
timurjin [86]

Answer:

The temperature would be too cold

Explanation:

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3 years ago
Which is the top layer of groundwater?
Ivanshal [37]

Answer:

An aquifer is a layer of porous substrate that contains and transmits groundwater. ... The upper level of this saturated layer of an unconfined aquifer is called the water table or phreatic surface. Below the water table, where in general all pore spaces are saturated with water, is the phreatic zone.

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3 years ago
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An interpretation of the results of many tests is called A) an experiment. B) a prediction D) a theory
nydimaria [60]

Answer:

B) a prediction

Explanation:

It is not option A because an experiment is one or more tests to see the check of a phenomenon in certain circumstances.

The idea is to validate or refute a hypothesis.

It is not option C because one theory is based on many proven hypotheses.

The correct option is B, a prediction. It is the principle that will lead us to a theory.

5 0
3 years ago
If the density of carbon tetrachloride is 0.893 g/mL, and a sample has a volume of 9.29 mL, what is the mass?
NNADVOKAT [17]

Answer:

8.3g

Explanation:

d=m/v

m=d*v

m=0.893*9.29

m=8.3g

3 0
3 years ago
How many kilocalories are required to increase the temperature of 15.6 g of iron from 122 °c to 355 °c. the specific heat of iro
Dmitriy789 [7]

Heat require to boil 15.6 g iron from 122 C0to 355 C0 whereas,

Q = m s dT

Where, m is mass of iron

s is specific heat of iron

d T is change in temperature in celcius

= 15.6 g * 0.45 J /g /C * (355 - 122)  = 1.63 * 10^3 J

If  

1 cal = 4.2 J

Then,  

Q = (1.63 * 10^3) /4.2 = 0.389 K cal

Thus 0.389 k cal of enrgy  is required by a 15.6 g Fe to reach to 355 C^0

4 0
4 years ago
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