Which of the following statements describes a scientific law?a. A scientific law explains a set of events.
b. A scientific law describes what occurs every time in a situation.
c. A scientific law is constantly modified.
d. A scientific law is developed without experimentation.

Answers

Answer 1

Answer:

The correct answer is B.

scientific law which describes what occurs every time in a situation. Scientific law always applies under same condition.

Laws differs from scientific theory because they does not posit explanation of phenomena.

Different laws takes mathematical forms. Scientific law is being associated with natural science but social sciences also contains laws.

A good example of scientific law in social sciences is Zipf's law.

Answer 2

Answer:

Answer:

B. a law is a proven fact that cannot be changed.

Explanation:

Related Questions

When you buy muriatic acid at the hardware store, you are actually buying hydrochloric acid. if you poor it directly on your concrete, and if your concrete contains enough limestone in it, you can actually get a pretty cool reaction. what numbers, in the correct order from left to right, would go in the blanks in order to balance this equation: ___hcl(aq) ___caco3(s) → ___cacl2(aq) ___ co2(aq) ___ h2o(aq)
Which component is required for the activation of some enzymes?a) Presence of a co-factor b) Basic pH levels in the substrate c) Higher enzyme concentration d) Lower temperature in the substrate
Which element is likely to be the most brittle
Which compound has the strongest hydrogen bonding between its molecules?(1) HBr (3) HF (2) HCl (4) HI
A scientist wants to perform a controlled experiment to test the effect of rust on chemically treated iron. which action would be most important to perform in a controlled experiment? design an experiment that is based on previously published results. expose the treated iron to the corrosive effects of the air. test a large piece of treated iron and a small piece of untreated iron. test a piece of treated iron and a piece of untreated iron under the same conditions.

You are throwing an object with a force of 140 N. The object accelerates 19.0 m/s/s. What is the mass of the object?

Answers

Answer:

7.4

Explanation:

F = m × a

F/a = m

m = 140 / 19

m = 7.4

MATCH THE FOLLOWING!!!(match each instrument with its description)

1. weather maps/satellite
2. Doppler radar
3. radiosonde
4. wind vane
5. psychrometer
__________________________________________________________________________
A. uses two thermometers; a dry and wet bulb
B. points in the direction winds are coming from
C. uses frequency waves to track particle movement
D. used to help track air masses and fronts
E. carried with a weather balloon

Answers

Answer: The correct matching sequence is:

1 -D , 2-C, 3-E, 4-B , 5-A

Explanation:

Weather maps/satellite:These are the satellites used to monitor the climate on the Earth in day and night.Like moc=vment of clouds, El Nino. La Nina ertc

Doppler radar is a system used to track the velocity or motion of the rain , storm or precipitation.It emit microwave signals to check the change in frequency of the wave due to the motion of the particles.

Radiosonde is an instrument carried away by balloon or any other means into different layers of atmosphere and sends information via radio.

Wind vane is an instrument used to show the direction of the wind. P

Psychrometer is an instrument used to measure atmospheric humidity.It consist of two thermometer that is wet bulb thermometer and dry bulb thermometer.

Match each weather instrument with its description.

weather maps/satellite - used to help track air masses and fronts
Doppler radar - uses frequency waves to track particle movement
radiosonde - carried with a weather balloon
wind vane - points in the direction winds are coming from
psychrometer - uses two thermometers; a dry and wet bulb

The amount of oxygen formed when 12.26 g of KClO3 is heated is ________.

Answers

Answer:

approximately 4.8 grams of oxygen gas is formed.

Explanation:

To determine the amount of oxygen (O2) formed when 12.26 grams of potassium chlorate (KClO3) is heated, we need to consider the chemical reaction that occurs during this process. When KClO3 is heated, it decomposes into potassium chloride (KCl) and oxygen gas (O2).

The balanced chemical equation for this reaction is:

2 KClO3(s) → 2 KCl(s) + 3 O2(g)

From the equation, we can see that 2 moles of KClO3 produce 3 moles of O2.

Calculate the molar mass of KClO3:

K: 39.10 g/mol

Cl: 35.45 g/mol

O: 16.00 g/mol

Molar mass of KClO3 = (39.10 + 35.45 + 3 * 16.00) g/mol = 122.55 g/mol

Calculate the number of moles of KClO3 in 12.26 grams:

Moles of KClO3 = (12.26 g) / (122.55 g/mol) = 0.1 moles

Now, we can determine the number of moles of O2 produced using the mole ratio from the balanced equation:

Moles of O2 = (0.1 moles of KClO3) * (3 moles of O2 / 2 moles of KClO3) = 0.15 moles

Finally, convert moles of O2 to grams:

Mass of O2 = (0.15 moles) * (32.00 g/mol for O2) = 4.8 grams

So, when 12.26 grams of KClO3 is heated, approximately 4.8 grams of oxygen gas is formed.

Calculate the number of moles 3.16 g of KMnO4 32.33 g of K2CrO4 100 g of KHCO3

Answers

The number of moles:
3.16g of $KMnO_(4)$
1 mole of $KMnO_(4)$ - 158g.
x moles of $KMnO_(4)$ - 3.16g.
$x=(1\ mole*3.16g)/(158g)=(3.16)/(158)=0.02\ mole$

The number of moles:
32.33g of $K_(2)CrO_(4)$
1 mole of $K_(2)CrO_(4)$ - 194g.
x moles of $K_(2)CrO_(4)$ - 32.33g.
$x=(1\ mole*32.33g)/(194g)=(32.33)/(194)=0.17\ mole$

The number of moles:
100g of $KHCO_(3)$
1 mole of $KHCO_(3)$ - 100.1g.
x moles of $KHCO_(3)$ - 100g.
$x=(1\ mole*100g)/(100.1g)=(100)/(100.1)=0.999\ mole$

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A graduated cylinder has 20 ml (cm3) of water placed in it. An irregularly shaped rock is then dropped in the graduated cylinder and the volume of the rock and water in the cylinder now reads 30 ml (cm3). The mass of the rock dropped into the graduated cylinder is 23 grams. a.) Find the volume of the rock dropped into the graduated cylinder.
b.) Find the density of the rock dropped into the graduated cylinder.

Answers

Answer:

$\boxed {\boxed {\sf v=10 \ mL \ and \ d=2.3 \ g/mL}}$

Explanation:

Answer:

Explanation:

A. Volume

The volume was found using water displacement. Subtract the initial volume from the final volume.

$final \ volume - initial \ volume$

The graduated cylinder had 20 milliliters of water (initial volume).

After the rock was added, the graduated cylinder read 30 milliliters (final volume).

Substitute the values in and subtract.

$30 \ mL- 20 \ mL$

$10 \ mL$

The volume of the rock is 10 milliliters.

B. Density

Density can be found by dividing the mass by the volume.

$d=(m)/(v)$

The mass of the rock is 23 grams. We just found the volume of 10 milliliters.

$m= 23 \ g\nd= 10 \ mL$

Substitute the values in and divide.

$d=(23 \ g)/(10 \ mL)$

$d= 2.3 \ g/mL$

The density of the rock is 2.3 grams per milliliter.

Answer:

Volume = 10 cm3

Density = 2.3g/cm3

Explanation:

volume:

30ml - 20ml = 10ml = 10cm3

density:

density = mass/volume

23/10

2.3g/cm3

What volume of oxygen at STP is required for the complete combustion of 100.50 mL of C2H2?

Answers

The given substance combusts following the reaction:

C2H2 + (5/2)O2 -> 2CO2 + H2O

Assume C2H2 is an ideal gas. At STP, 1 mol of an ideal gas occupies 22.4 L. Given 100.50 mL of C2H2, this means that there is 4.4866 x 10^(-3) mol. Combusting 1 mol of C2H2 consumes (5/2) mol of O2, then combusting the given amount of C2H2 consumes 0.01121 mol of O2. At STP, this amount of O2 occupies 251.25 mL.

Answer: 251.25 ml

Explanation: $2C_2H_2(g)+5O_2(g)\rightarrow 4CO_2+2H_2O$