Chemistry, 16.12.2020 17:00 jkw1222p0ttvq

SOMEONE, PLEASE HELP ME AND ILL HELP YOU THIS TAKES MY WHOLE GRADE What is a pure substance?

A. a material that cannot be physically separated into its parts
B. a substance that cannot be separated or broken down into simpler substances by chemical means
C. the smallest unit of an element that has the chemical identity of that element
D. an arrangement of all the known elements in order of their atomic number

#2 - TRUE OR FALSE: Smelting is a process that uses heat to separate pure metals from a mixture that also contains other substances.

A. True
B. False

#3 - TRUE OR FALSE: Currently, 200 elements are known.

A. True
B. False

#4 - What is an element?

A. a material that cannot be physically separated into its parts
B. the smallest unit of an element that has the chemical identity of that element
C. a substance that cannot be separated or broken down into simpler substances by chemical means
D. an arrangement of all the known elements in order of their atomic number

#5 - TRUE OR FALSE: Only two elements can have exactly the same set of properties

A. True
B. False

#6 - What is an atom?

A. a substance that cannot be separated or broken down into simpler substances by chemical means
B. an arrangement of all the known elements in order of their atomic number
C. a material that cannot be physically separated into its parts
D. the smallest unit of an element that has the chemical identity of that element

#7 - TRUE OR FALSE: Atoms are so tiny that they cannot be seen with an optical microscope.

A. True
B. False

#8 - TRUE OR FALSE: Gold and silver are both soft metals that react vigorously with water and air.

A. True
B. False

#9 - What is the periodic table?

A. a substance that cannot be separated or broken down into simpler substances by chemical means
B. a material that cannot be physically separated into its parts
C. the smallest unit of an element that has the chemical identity of that element
D. an arrangement of all the known elements in order of their atomic number

#10 - TRUE OR FALSE: The first column of the table contains a group of very reactive metal elements.

A. True
B. False

Answers: 1

Show answers

Another question on Chemistry

Chemistry, 22.06.2019 03:30

Asample of ammonia reacts with oxygen as shown. 4nh3(g) + 5o2(g) 4no(g) + 6h2o(g) what is the limiting reactant if 4.0 g of nh3 react with 8.0 g of oxygen? o2 because it produces only 0.20 mol of no. nh3 because it produces only 0.20 mol of no. o2 because it produces two times less no than nh3. nh3 because it produces three times more no than o2.

Answers: 3

Answer

Chemistry, 22.06.2019 04:30

How do i complete this electrolysis of water lab? i’m at home, so i don’t have the materials, and the lab didn’t properly work and was incomplete at school.

Answers: 1

Answer

Chemistry, 22.06.2019 22:00

Does the number of ions in solution increase, decrease, or remain constant? it continuously decreases. it continuously increases. it decreases at first, then increases. it increases at first, then decreases.

Answers: 3

Answer

Chemistry, 22.06.2019 23:00

Need asap question 1 minerals are organic compounds. true false question 2 what vitamin can be found in foods like oranges, grapefruits, and broccoli? a. vitamin a b. vitamin k c.vitamin c d. vitamin d question 3 what are minerals? a. chemical elements that are needed for body processes. b. organic compounds that the body needs in small amounts to function properly. c. small molecules used to build proteins. d. an organic compound that is insoluble in water and includes fats. question 4 how many types of vitamins does the human body need? a. 15 b. 11 c. 13 d. 17 question 5 vitamins are a good source of energy. true false

Answers: 1

Answer

You know the right answer?

SOMEONE, PLEASE HELP ME AND ILL HELP YOU THIS TAKES MY WHOLE GRADE What is a pure substance?
...

Questions