Question 1 (1 point) Why can a solution be classified as a mixture?

Question 1 options:

Both are made up of two substances that are not chemically combined.

Both are always homogeneous.

It is made up of only one substance.

Both are made up of two substances that are chemically combined.

Question 2 (1 point)
Which choice is an element?

Question 2 options:

air (N2 mixed with O2 , and CO2 )

oxygen (O2 )

sodium chloride (NaCl)

water (H2O )

Question 3 (1 point)
Which choice is a compound?

Question 3 options:

air (N2, O2 mixed with CO2)

carbon (C)

carbon dioxide (CO2 )

oxygen (O2)

Question 4 (1 point)
Which choice is a mixture?

Question 4 options:

carbon dioxide (CO2)

oxygen (O­2)

air (N2 mixed with O­2 and CO2)

carbon (C)

Question 5 (1 point)
How is a pure substance different from a mixture?

Question 5 options:

A pure substance is heterogeneous.

Pure substances cannot be separated by physical means.

A mixture is made of one substance.

Mixtures cannot be separated by physical means.

Please help!!

Quickly! brainliest if two people answer! 1. the blood has red blood cells, white blood cells and platelets. red blood cells carry oxygen to other cells in the body. cells need oxygen to live. white blood cells destroy certain germs. they protect our bodies from disease. which question is answered in this paragraph? (a) what is the role of blood vessels? (b) what type of cells are attached to bones? (c) what type of blood cell to clot your blood? (d) what are the different types of blood cells? 2. which sentence from the section "stem cells" best explains the role of stem cells? (a) when one kind of cell stops working, stem cells can . (b) they can turn into that cell and take its place. (c) scientists are studying new ways to use stem cells. (d) these cells can people heal faster. 3. read the selection from the section "nerve cells." nerve cells send messages to the rest of our bodies. these messages move between the brain, spinal cord and various organs. nerve cells are also called neurons. fill in the blank. a "neuron" is a (a) cell that moves information from the brain to other parts of the body (b) stem cell that has both an axon and a dendrite (c) cell that controls the fingers of a body (d) cell that makes up the spinal cord 4. some muscles in our body move without us telling them to. these are called involuntary muscles. some examples are the cardiac muscle cells inside the heart. these cells the heart relax and fill with blood. what is the best definition of "involuntary" based on the context clues? (a) something that happens on its own (b) trying hard to do something (c) something moving back and forth (d) easily moved

650.j is the same amount of energy as? 2720cal1550cal650.cal2.72cal

Need ! asap will mark 10 pts using the room temperature line (orange line) and your periodic table, make lists that identify the state of matter (gas, liquid, or solid) in which each element you plotted exists at room temperature. explain your answers