what method is suitable to determine whether barium is more reactive than calcium​

Answer:

primary source: documents the result of original researche.

: is written by those who have conducted researche.

: includes firsthand information about their methodologies, data, results or conclusions.

Secondary source: summarizes, compares, critiques or interprets the primary source.

Explanation:

Primary source is the research articles published in scholarly, peer reviewed journal.

Secondary source is the summarises, critiques or interpretations of primary source.

Answer:

Same # of protons.

Explanation:

It's right cuz I took the test like last year and I still remember the answer

Answer:

0.24%

Explanation:

To find the percent error, first subtract the actual value by the expected value.  You can ignore the sign of the difference.

42.0 - 42.1 = -0.1 = 0.1

Divide the difference by the expected value and multiply by 100%.

0.1/42.1 = 0.0024 × 100% = 0.24%

The percent error is 0.24%.

Answer: 10.63

Explanation: You divide the mass by volume.

Answer:

10.64g/cm³

Explanation:

1cm³ = 1ml

22 × 1cm³ = 22cm³

Density = Mass ÷ Volume

234 ÷ 22

Density = 10.64g/cm³ or 10640kg/m³

Mental models also guide your perception and behavior. They are the thinking tools that you use to understand life, make decisions, and solve problems. Learning a new mental model gives you a new way to see the world—like Richard Feynman learning a new math technique. Mental models are imperfect, but useful.

hope this helped :)

Answer:

When marshmallows are toasted, a chemical change occurs. The sugar molecules in the marshmallow are being changed into carbon (1). Sugar can be changed into water molecules. ... The flame on stage - oxygen diffuses to the surface of the marshmallow from the surrounding air.

Answer:

given is 7200 km in 9 hours, formula is s=d/t, work is 7200/9, answer is 800km/h

Explanation:

first of all you should know that

1 ml = 1 cm³

therefore

increase in volume after putting stone=∆volume

= 52 - 40

= 12 ml

= 12 cm^3

therefore volume of the rock= change in volume= 12cm^3

The volume of the rock dropped into a cylinder containing 40 mL of water is 12 mL.

From the question given above, the following data were obtained:

Volume of water = 40 mL

Volume of water + rock = 52 mL

The volume of the rock can be obtained as follow:

Volume of rock = (Volume of water + rock) – (Volume of water)

Volume of rock = 52 – 40

Thus, the volume of the rock is 12 mL.

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Answer:

nuclear vision provides energy for nuclear power and drives the explosion of nuclear weapons both uses are possible because certain substances called nuclear fuels undergo visions when struck by fishing neutrons and turned into emit neutrons when they break apart

Explanation:

I remember taking this test and seen this on the test and it was correct

Answer:

ya um i though i know it

Explanation:

Answer:

The number of electrons in the outermost shell of an atom determines its reactivity. Noble gases have low reactivity because they have full electron shells. Halogens are highly reactive because they readily gain an electron to fill their outermost shell.

Explanation:

Answer:

A

Explanation:

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Formula mass of CaCO3 is

40 + 12 + 3-100amu....

100g CaCO3 = 1 mole..

50g of CaCO3 = 1÷ 100x 5 = 0.5mole...

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Hope it helps you..

Thanks...

Answer:

There are 1000 mg in 1. g

There are 1000 g in 1 kg

Each students needs 2,250 mg of clay

Explanation:

In order to determine the amount of how many kilograms to order, the teacher will need to find out the total mass of clay required by the students and then the teacher will have to convert the total mass to the units required for the purchase.

The teacher would have to find out how many milligrams make one kilogram as follows

1 kg = 1000 g

1 g = 1000 mg

Therefore, 2,250 mg = 2250/1000 g = 2.25 g

2.25 g = 2.25/1000 kg = 0.00225 kg.

Answer:

Increase

Explanation:

Density = Mass ÷ Volume

Let the mass be 100 for instance and the original volume to be 4.

100 ÷ 4 = 25

The new volume let it be 2.

100 ÷ 2 = 50

50 is more than 25 so the density increases

Answer:

3 different elements make up Glucose

Explanation:

C = Carbon ( *6 )

H = Hydrogen ( *12 )

O = Oxygen ( *6 )

Explanation:

from producer to primary consumer is the correct answer of this question

Answer:

The answer is B.

Explanation:

"From producer to primary consumer"

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Answer:

The options are not really clear, however, the answer is 3.2 × 10^3ug

Explanation:

Milligram (mg) and microgram (ug) are interconvertible measurements of mass or weight. One microgram (ug) is a millionth gram while one milligram (mg) is a thousandth gram.

Hence, one milligram is a thousandth microgram i.e. 1 mg = 1000 ug

Therefore, a measurement of 3.2mg in ug will be; 3.2 × 1000

= 3200

= 3.2 × 10^3 ug

Hence, an equivalent measurement of 3.2mg is 3.2 × 10^3ug.

Answer:

c) 90

Explanation:

Answer:

C

Explanation:

The amount of heat required to increase temperature by  Δ T of an object with mass  m  and specific heat  s  is given by  Q = m s Δ T . For copper specific heat  s = 0.09   c a l / go C

Answer:

it denotes 6.52× 10⁸ in scientific notation

Answer:

D) 21.9

Explanation:

1 kilocalorie is equal to 4184 joules

0.001 kilocalorie is equal to 1 calorie

so 5.25 calorie=21.966 joules

Negative and positive ions alternate in the ionic crystals. For instance, the melting point of calcium fluoride (CaF[tex]_2[/tex]) is 1418 °C. Therefore, the correct option is option C.

The description of crystalline solid states that it is a substance whose atoms or even subatomic particles are organized in a highly structured form.  Atomic nuclei in metallic crystals are surrounded by a "sea" of delocalized electrons.

Molecules of many types make up molecular crystals. Atoms that are covalently bound to one another make up covalent network crystals. Jewelry is crafted with diamond. Quartz is used to create things like watches and wall clocks. Among all the given options diamond is the only compound which is Crystalline Solid.

Therefore, the correct option is option C.

To learn more about Crystalline Solid, here:

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Answer:

1,760

Explanation:

There are 880 fathoms in a mile. To convert miles to fathoms, multiply the mile value by 880.

So, 2.00 × 880 = 1,760

Answer:

The correct answer would be - c.  A solid was added to water and the mixture was stirred until the solid was no longer visible

Explanation:

Photostabalizing is the process where a solid change its color in the presence of ultraviolet light, it is a chemical change, so the first option would not be the correct answer.

when two liquid or aqueous solutions are mixed together and form a solid substance, this reaction is known as precipitation and it is a chemical reaction too.

When a solid is placed in a liquid and after stirring it makes the solid vanish is a physical change known as dissolving character.

Thus, the correct answer is option C.

Answer:

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Answer:

ancient Egyptian event lighthouses including the huge lighthouse of Alexandria

Explanation:

-250 BCE

Answer:

The correct option is;

C. Yes, it would hurt because the bricks would still have the same mass

Explanation:

Given that the expression "like a ton of brick" refers to the tendency of an object being crushed by another object, which is due to the impact of the force, and from Newton's law a force is proportional to the rate of change of momentum produced, therefor if the brick of the same mass is given the same velocity as it had on the Earth while the person remains stationary, it will hurt if the brick hits the person.

Answer:

To say his data is precise, he has to discard option b - 85.6 degrees Celsius

Explanation:

During laboratory experiments, the precision of a result data covers the sameness of the data generated or results got each time the experiment is performed.

For the results to be seen as precise, the temperatures recorded during each experiment should be the same, or really close to each other.

Judging based on that, option B does not fit in as it is quite different from the other results by about 2 degrees Celsius. It also indicates that some errors may have occurred during the experiment.

To say his data is precise, he has to discard option b - 85.6 degrees Celsius.

The other temperatures recorded are close to each other. This would now make the data precise.