CHEMISTRY MIDDLE SCHOOL

2 or more components - Substance is two or more diltermore different types of source material.
Chemically combined

Answers

Answer 1

Answer:

Answer:

A compound

Explanation:

A compound is a substance made up of two or more components that are chemically combined together.

The substances that combines to form a compound is called elements.

The properties of compounds are distinct and different from the elements that combines to make them.

A wide array of compounds are known and they arise from different arrangements of atoms of elements.

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Which of the following is an example of a model?A. The solar system
B. A globe
C . A planet
D. A padlock

Answers

The answer is B a globe
Hope this helped

B: a globe
You can see the fratures of the planet & the names as well all depending WHICH globe you get

A mass of 9.2 kg is accelerated at 2.1 m/s^{2}. what is the force?

Answers

Answer:

The force is 19.3N

Explanation:

F = m × a

= 9.2 × 2.1

= 19.3N (3sf)

What does the number next to isotopes signify?

Answers

The number next to isotopes signifies the sum of the number of protons plus the number of neutrons in the nucleus of an atom. An isotope is a version of an atom that has the same number of protons but different numbers of neutrons. Isotopes are very important in nuclear chemistry. A proton is a is a particle in the nucleus of an atom that has a positive charge. A neutron is also a particle in the nucleus of an atom, but it does not have an electric charge.

Which reaction is endothermic

Answers

The second one is endothermic as endothermic reactions require energy for the reaction to take place.

Answer: the second one

Explanation: i got it right on edg2020

In the reaction Mg (s) + 2HCl (aq) H2 (g) + MgCl2 (aq), how many moles of hydrogen gas will be produced from 75.0 milliliters of a 1.0 M HCl in an excess of Mg?