Chemistry

Question 1

Q1: What is matter?

Answer 1

A1: Anything that has mass and takes up space.

Question 2

Q2: What does the particle theory state?

Answer 2

A2: Matter is made of tiny particles always in motion.

Question 3

Q3: What are the three states of matter?

Answer 3

A3: Solid, liquid, and gas.

Question 4

Q4: How do particles behave in solids?

Answer 4

A4: They are tightly packed and vibrate in place.

Question 5

Q5: How do particles behave in liquids?

Answer 5

A5: They are close together but move around each other.

Question 6

Q6: How do particles behave in gases?

Answer 6

A6: They are far apart and move freely.

Question 7

Q7: What is a pure substance?

Answer 7

A7: Matter made of only one type of particle.

Question 8

Q8: What is a mixture?

Answer 8

A8: Matter made of two or more types of particles.

Question 9

Q9: What is an element?

Answer 9

A9: A pure substance made of only one type of atom.

Question 10

Q10: What is a compound?

Answer 10

A10: A pure substance made of two or more elements chemically combined.

Question 11

Q11: What is a homogeneous mixture (solution)?

Answer 11

A11: A mixture that looks uniform throughout, like saltwater.

Question 12

Q12: What is a heterogeneous mixture (mechanical mixture)?

Answer 12

A12: A mixture where you can see the different parts, like trail mix.

Question 13

Q13: What are physical properties?

Answer 13

A13: Characteristics of matter that can be observed or measured without changing the substance.

Question 14

Q14: What is a qualitative property?

Answer 14

A14: A property described without numbers, like color or texture.

Question 15

Q15: What is a quantitative property?

Answer 15

A15: A property measured with numbers, like mass or volume.

Question 16

Q16: What is a physical change?

Answer 16

A16: A change in appearance but not the substance, like melting ice.

Question 17

Q17: What is density?

Answer 17

A17: The mass of a substance divided by its volume.

Question 18

Q18: What is the formula for density?

Answer 18

D = m/v (m = mass, v = volume)

Question 19

Q19: What are the units for density?

Answer 19

A19: Grams per cubic centimeter (g/cm³) or grams per milliliter (g/mL).

Question 20

Q20: What are chemical properties?

Answer 20

A20: Characteristics that describe how a substance reacts, like flammability.

Question 21

Q21: What is a chemical change?

Answer 21

A21: A change that forms new substances, like rusting metal.

Question 22

Q22: What are signs of a chemical change?

Answer 22

A22: Color change, gas produced, heat/light, or a new substance forms.

Question 23

Q23: What is an atom?

Answer 23

A23: The smallest unit of an element.

Question 24

Q24: What is the periodic table?

Answer 24

A24: A chart that organizes elements by their properties.

Question 25

Q25: What are metals?

Answer 25

A25: Elements that are shiny, good conductors, and malleable.

Question 26

Q26: What are nonmetals?

Answer 26

A26: Elements that are dull, poor conductors, and brittle.

Question 27

Q27: What is the reactivity of an element?

Answer 27

A27: How easily it reacts with other substances.

Question 28

Q28: What is a Bohr-Rutherford diagram?

Answer 28

A28: A model showing the nucleus and electron orbits of an atom.

Question 29

Q29: How many electrons fit in the first shell?

Answer 29

A29: 2 electrons.

Question 30

Q30: How many electrons fit in the second shell?

Answer 30

A30: 8 electrons.

Question 31

Q31: What is a compound?

Answer 31

A31: A substance made of two or more elements chemically combined.

Question 32

Q32: How do you count atoms in a chemical formula?

Answer 32

A32: Multiply the subscript by the coefficient for each element.

Question 33

Q33: What is the chemical formula for water?

Answer 33

A33: H20

Question 34

How many atoms are in H2SO4?

Answer 34

A34: 2 hydrogen, 1 sulfur, and 4 oxygen atoms.