A substance that can be separated into two or more substances only by a chemical change is

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Answer 1

Answer: A substance that can be separated into two or more substances only by a chemical change is known as a heterogeneous mixture

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The metal wire in an incandescent light bulb glows when the light is switched on and stops glowing when it is switched off. This simple process is which kind of a change?

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physical change because the matter in the object is not chemically changing

A scientist is performing an experiment on a powder. Which of the following is a sign that a chemical change has definitely occurred during his experiment?The powder catches on fire.
The powder releases bubbles.
The powder heats up.
The powder breaks apart into smaller particles.

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The powder catches fire. The rest of the choices pertains to physical changes on the powder. When the powder catches fire a chemical change happens. For example, if the powder is organic, carbon dioxide and water will result during the combustion.

Answer:

➢ⅇ powder catches on fire

....….that would be your answer

Explanation:

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The nucleus of an atom of K-42 contains(1) 19 protons and 23 neutrons
(2) 19 protons and 42 neutrons
(3) 20 protons and 19 neutrons
(4) 23 protons and 19 neutrons

Answers

The atomic number is the number of protons, while the atomic mass is the number of protons added to the number of neutrons. By definition, potassium (K) has atomic number 19, so it should have 19 protons. If it has a mass of 42, then the number of neutrons is 42 - 19 = 23 neutrons. This is choice (1).

Number of proton K => 19
therefore, 42 - 19 = 23.

So the answer is 19 protons and 23 neutrons.

Allicin contains 59.9 g of carbon, 21.7 g of hydrogen, 24.4 g of oxygen, and sulfur. What is the mass percent of sulfur in a 162 g sample of the compound?"

Answers

Answer: The mass percentage of sulfur in the given compound is 34.56 %.

Explanation:

We are given:

Mass of carbon in compound = 59.9 g

Mass of oxygen in compound = 24.4 g

Mass of Hydrogen in compound = 21.7 g

Mass of the compound = 162 g

Mass of sulfur in compound = $162-(59.9+24.4+21.7)=56g$

To calculate the mass percent of an element in a compound, we use the equation:

$\text{Mass percent of sulfur}=\frac{\text{Mass of sulfur in compound}}{\text{Mass of the compound}}* 100$

Putting values in above equation, we get:

$\text{Mass percent of sulfur}=(56g)/(162g)* 100 = 34.56\%$

Hence, the mass percentage of sulfur in the given compound is 34.56 %.

You can get the mass of sulfur on this compound by minus other element mass from total mass. So the mass is 162-59.9-21.7-24.4=56 g. The mass percent is 56/162*100%=34.57 %.

The two ends of a solenoid act likea. electrons.
b. a compass needle.
c. a circuit.
d. poles.

Answers

Answer:

d. poles

Explanation:

Magnetic field created by a solenoid:

The magnetic field created by a solenoid is increased by increasing the intensity of the current, by increasing the number of turns and by introducing a piece of iron inside the coil (electromagnet).

Solenoid coil with air core constructed with bare copper wire spirally wound and protected with insulating varnish. If we supply this coil with electric current using any source of electromotive force, such as a battery, for example, the flow of the current that will circulate through the coil will lead to the appearance of a magnetic field of a certain intensity around it.

Solenoid coil to which a metal core such as iron (Fe) has been introduced. If we compare the previous coil with air core with the coil of this illustration, we will see that now the lines of magnetic force are much more intensified as they have become an electromagnet.

D) The Answer Is Poles

Is amber eye color considered brown?

Answers

Hello,

Amber eye color is not considered brown. The colors in the amber eye color are golden or copper.

Thanks for using brainly.

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