I need help with this science test im in 8th grade not high school btw Question 1 Which two groups of elements in the periodic table are the most reactive?

A halogens and noble gases
B alkaline earth metals and halogens
C alkali metals and halogens
D noble gases and alkali metals

Number 2 Which statement about nitrogen (N) and phosphorus (P) is correct?

A They have the same number of electron shells.
B They have the same number of valence electrons.
C They are both inert.
D They are both classified as halogens.

number 3 Which property do transition metals have in common?

A They are usually very soft.
B They usually have low densities.
C They usually have high melting points.
D They are usually very reactive.

Question 4 Neon and argon are both in Group 18 of the periodic table. Which property do they most likely share?

A strong odor
B silver color
C low or no reactivity
D metallic texture

Question 5 scientist studies an element that has seven electrons in its outer shell, is fairly toxic, is a gas at room temperature, and is highly reactive. To which group of the periodic table does this element belong?

A 2 - alkaline earth metals
B 17 - halogens
C 1 - alkali metals
D 18 - noble gases

Which of the following represents the chemical reaction of hydrazine and hydrogen peroxide to produce nitrogen and water? a. nitrogen + hydrogen peroxide → hydrazine + water b. nitrogen + water → hydrazine + hydrogen peroxide c. hydrazine + hydrogen peroxide → nitrogen + water d. water + hydrogen peroxide → nitrogen + hydrazine

Interpret the model. a three-part model with black right-arrows between the parts. left part: a large green apple-shaped component with a w-shaped indentation centered on top. a small blue apple-slice shape sits above the left indentation and an arrow points from the shape to the indentation. a small purple apple-slice shape and arrow sit above the right indentation and an arrow points from the shape to the indentation. middle part: a large green apple-shaped component with a square indentation centered on top. sitting in the left side of the indentation is a blue apple-slice shape with a flat bottom, fused to a purple apple-slice shape with a flat bottom on the right side of the indentation. right part: a large green apple-shaped component with a w-shaped indentation centered on top. an up-arrow is centered above the indentation pointing to a fused blue and purple apple-slice-shaped flat-bottom component sitting above the indentation. assigne "true" or "false" to the end of each statement. the model shows a shape change occurring in the enzyme after the substrate is bound in the active site. t/fthere are two products in this model. t? f there are three substrates in this model. t/f the model shows two different enzymes. t/f

What is true of all organisms in the kingdoms protista, plantae, fungi, and animalia? a. they are multi-celled. b. they are photosynthetic. c. they have cells that contain membrane-bound organelles. d. they contain cells that lack membrane-bound organelles.