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3 years ago

What is a constant in an experiment?

2 answers:

7 0

Science experiments usually include an independent variable, dependent variable, and control.Science experiments also include something called constants. A constant is the part that doesn't change during the experiment.A constant variable does not change. A control variable on the other hand changes, but is intentionally kept constant throughout the experiment so as to show the relationship between dependent and independent variables.A scientific control is an experiment or observation designed to minimize the effects of variables other than the independent variable. This increases the reliability of the results, often through a comparison between control measurements and the other measurements

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Ulleksa [173]3 years ago

6 0

Science experiments usually include an independent variable, dependent variable, and control. ... Science experiments also include something called constants. A constant is the part that doesn't change during the experiment.

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The total mass of reactants and products is _______ during a chemical reaction

SIZIF [17.4K]

Answer: The total mass of reactants and products is the same during a chemical reaction.

Explanation:

the total mass of reactants is equal to the total mass of products.

5 0

3 years ago

10. A 38.0-g sample of NaOH is dissolved in water, and the solution is diluted to give a final

Sonbull [250]

Answer:

B.0.558M

Explanation:

M=n/L

n=m/Mm

Mm=NaOH

=23+16+1

=40g/mol

n=m/Mm

= 38/40

=0.95

M=n/L

=0.95/1.70

=0.558

8 0

3 years ago

Hello can somone help me ?

zalisa [80]

$174 \; \text{protons} / (29 \; \text{copper atoms} \cdot \text{proton}^{-1}) = 6 \; \text{copper atoms}$

Thus 174 protons would make at most 6 copper atoms. However, it would take 174 extra electrons (29 per atom) and even more neutrons than that to construct neutral copper atoms with stable nuclei.

7 0

3 years ago

How many atoms are in .190g of P2O5?

jasenka [17]

To go from grams to atoms, you first have to convert to moles and them to atoms. To do that, divide the amount in grams by the atomic weight (141.95 in this case) and then multiply by avagadros number (6.022×10^23). After you do all of this, you should get 8.06×10^20.

7 0

3 years ago

Define the terms octet rule.

luda_lava [24]

Answer:

The octet rule is a chemical rule of thumb that reflects the theory that main-group elements tend to bond in such a way that each atom has eight electrons in its valence shell, giving it the same electronic configuration as a noble gas.

8 0

3 years ago