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svetlana [45]
3 years ago
6

Select all that apply. A scientific law: A- is generally accepted as true B- has never been found to be in error C- has no known

contradictions D- must be reverified occasionally
Chemistry
2 answers:
Anon25 [30]3 years ago
6 0

A and D

They are sometimes proven wrong and contradicted, so these would make the most sense

Sidana [21]3 years ago
4 0

Answer:

A) is generally accepted as true

D)must be re verified occasionally

Explanation:

A scientific law is proposed based on some scientific studies including hypothesis, thesis , verification etc.

These when proposed are considered as true that is why they are accepted.

However with time they must be re verified occasionally so that if chance of some contradiction and error can be minimized. For example periodic law proposed by Mendleev was based on atomic weight which was later on changed to be based on atomic number.

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An aluminum ion has a charge of +3, and an oxide has a charge of -2. What would be the product of a reaction between these two e
kozerog [31]

The product of a reaction between these two elements is Al_{2} O_{3}.

Explanation:

The oxidation state of an ion in a compound is equal to its charge.

The aluminum having a charge of +3 because oxidation state is +3

The oxide is having charge of -2

The product of these reactants will produce a chemical compound.

The compound formed is Al_{2} O_{3}  i.e Aluminium oxide. The compound while getting formed will share the charge and cation A+ will have the charge of anion and anion will have the charge of cation. This will result in a compound as there should be a neutral charge on the compound formed.

The <em>+</em><em>3 charge of the cation Al+ will go to anion oxide O2- and the charge of anion -2 will go with cation Al+. </em>

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8 0
3 years ago
A gas has a volume of 490. mL at a temperature of -35.0 degrees C. What volume would the gas occupy at 42.0 degrees Celsius? Ple
miskamm [114]

Answer:

648.5 mL

Explanation:

Here we will assume that the pressure of the gas is constant, since it is not given or specified.

Therefore, we can use Charle's law, which states that:

"For an ideal gas kept at constant pressure, the volume of the gas is proportional to its absolute temperature"

Mathematically:

\frac{V}{T}=const.

where

V is the volume of the gas

T is its absolute temperature

The equation can be rewritten as

\frac{V_1}{T_1}=\frac{V_2}{T_2}

where in this problem we have:

V_1=490 mL is the initial volume of the gas

T_1=-35.0^{\circ} + 273 = 238 K is the initial temperature

T_2=42.0^{\circ}+273=315 K is the final temperature

Solving for V2, we find the final volume of the gas:

V_2=\frac{V_1 T_2}{T_1}=\frac{(490)(315)}{238}=648.5 mL

8 0
4 years ago
How are muscles able to keep making energy even when no food is eaten and glucose levels are low?
erastova [34]

Although lipids hold the majority of the body's energy reserves, glycogen is the body's primary energy source.

Glucose is a polymer that makes up glycogen. Our body's primary source of energy is carbs. The remaining glucose in the body is turned into glycogen and stored in various places, but the majority of our body's energy reserves are found in fats, which are kept in the form of lipids.

Where does the energy come from in the muscles?

The chemical energy that is stored in our meals is used by muscles to produce heat and motion energy (kinetic energy). Energy is necessary for maintaining body temperature, promoting physical activity, and enabling tissue growth and repair. Foods high in protein, fat, and carbohydrates provide energy.

What Takes Place to Muscles in the Absence of Glucose?

Your body converts carbs, such as those found in bread or fruit, into glucose after consumption. Glycogen is the form of glucose that is stored in your muscles and liver and is used for energy when you are not eating or while you are exercising.

To learn more about source of energy in body, visit

brainly.com/question/7493628

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7 0
1 year ago
Identify the functional groups attached to the benzene ring as either, being electron withdrawing, electron donating, or neither
Dominik [7]
-OH is elctron donating  -C=-N is electron withdrawing  -O-CO-CH3 is electron withdrawing  -N(CH3)2 is electron donating  -C(CH3)3 is electron donating  -CO-O-CH3 is electron withdrawing  -CH(CH3)2 is electron donating  -NO2 is electrong withdrawing  -CH2
8 0
4 years ago
Apply the law of conservation of mass to explain how mass is conserved when water evaporates 
frutty [35]
The law of conservation holds that mass can not be destroyed but can only take on different forms. So if 5 g of water becomes a gas it becomes 5 g of water vapor. The mass of the liquid water is simply transferred into the mass of the newly formed water vapor. 
8 0
4 years ago
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