Chemistry Middle School

Which of these is an example of how a scientist might use a model?

A) using a stopwatch to clock a runner's mile time
B) measuring the mass of an object with a scale
C) magnifying a group of cells with a microscope
D) building a brain made of plastic with many of its parts labeled

Answers

Answer 1

Answer: Marbles placed inside a hollow sphere are used to describe protons in a nucleus.

Answer 2
D, because it’s a model, not a real life subject. Have a great day!

Related Questions

What are the four main categories of stars?
How does each of these types of stars differ in size, brightness, and temperature? *Answer both, please!* :)

Answers

Answer:

Read below:

Explanation:

1. The four main categories of stars are:

O-type stars: These are the hottest and most massive stars. They are extremely bright and have surface temperatures of more than 30,000 K.B-type stars: These stars are slightly cooler and less massive than O-type stars. They have surface temperatures of around 10,000 K and are also very bright.A-type stars: These stars are cooler and less massive than B-type stars. They have surface temperatures of around 7,500 K and are relatively bright.M-type stars: These stars are the coolest and least massive of the four categories. They have surface temperatures of less than 3,500 K and are not very bright.

2. In general, O-type stars are the largest and most luminous, while M-type stars are the smallest and least luminous. B-type and A-type stars fall in between these two extremes in terms of size, brightness, and temperature. However, there is a lot of variation within each of these categories, and there is not a hard and fast rule for how these characteristics relate to one another. The size, brightness, and temperature of a star depend on a variety of factors, including its mass, age, and composition.

(Repost) How would you balance the following chemical equation:
A) Place a 2 in front of Ca2
B) Place a 2 in front of O2
C) Place a 2 in front of CaO
D) It is already balanced

Answers

Answer:

C) Place a 2 in front of CaO

Explanation:

The equation:

Ca2 +O2 → CaO is not balanced as there are 2 atoms of Ca from Ca2 on the left side and there is 1 atom of Ca from CaO on the right side, so add a 2 in front of CaO.

Ca2+O2 → 2CaO

On the left we have:

2 atoms of Ca

2 atoms of O

On the right we have:

2 atoms of Ca

2 atoms of O

The equation is now balanced as there are equal numbers of atoms of each side

C, the reactants have an equal charge so there isn’t a need to have multiple of them. Because there’s two of each, there will we 2 of the product

This photo shows the results of one kind of reproduction




Which statement Best describes this kind of reproduction?


A. Each parent passes half of it's genes to every offspring
B. all the offspring of a set of parents have identical genes
C. Each parent passed all of it's genes to every offspring
D. Only one parent is required to produce offspring

Answers

Answer:

b

Explanation:

their genetics come from the same two parents so if their genetics looked different it would mean that a offspring wasnt one of the parents.

To solve this, we must know each and every concept behind reproduction. Therefore, all the offspring of a set of parents have identical genes best describes this kind of reproduction. the correct option is option B.

What is reproduction?

The process through which organisms duplicate themselves is known as reproduction. In general, reproduction is among the most essential notions in biology: it involves creating a replica, a likeness, and so ensuring the survival of species.

Their genetics are derived from the exact two parents, thus if their genetics differed, it meant that an offspring was not one of the mom and dad. "All the offspring of a set of parents have identical genes"  best describes this kind of reproduction.

Therefore, all the offspring of a set of parents have identical genes best describes this kind of reproduction. the correct option is option B.

To know more about reproduction, here:

https://brainly.com/question/14329745

#SPJ1

What makes the Oxygen Family unique?

Answers

Answer:

Oxygen is in group 16 in the periodic table.  All the elements in this group have in common the number of valence electrons in their outer shell (6 valence electrons).  The only reason I can see that they may be considered "mixed"  is because the group includes non metals and metalloids.

Explanation:

What is the net force on the object in this diagram?

A) 336 N upward
B) 90 N to the right
C) 590 N to the left
D) 90 N to the left

Answers

I think the answer is d
Option D :- 90N towards the left

What do elements in the Oxygen Group have in common?

Answers

Answer:

Oxygen is in group 16 in the periodic table.  All the elements in this group have in common the number of valence electrons in their outer shell (6 valence electrons).  The only reason I can see that they may be considered "mixed"  is because the group includes non metals and metalloids.

Explanation:

Answer:

Elements in the Oxygen Group (also called the Chalcogen Group) are all non-metal elements that are located in Group 16 of the periodic table. They include oxygen, sulfur, selenium, tellurium, and polonium. These elements all have similar properties because they have a similar number of valence electrons, which are the electrons in the outermost energy level of an atom. They all also tend to form compounds by gaining two electrons to become negatively charged ions.

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Which of these is a characteristic of index fossils?


Found in the topmost rock layer

Found in many layers of the same rock

Have already established relative age

Are limited to a particular geographic location

Answers

Answer: It is the third one.

Explanation:

An index fossil is something that a human can estimate the age of the fossil by looking at it.

The answer is the third one.

Index fossils are distinct in nature and recognisable. It is also widely present across the world. It is abundant and found everywhere.

Which of the following is a type of liquid solution?
solid-liquid
liquid-liquid
all of the above
gas liquid

Answers

Answer:

all of the above

Explanation:

All of the above is the answer to your question

Which of these is a characteristic of index fossils?

Found in the topmost rock layer
Found in many layers of the same rock
Have already established relative age
Are limited to a particular geographic location

Answers

Answer:

Which of these is a characteristic of index fossils?

Found in the topmost rock layer

Found in many layers of the same rock

Have already established relative age X

Are limited to a particular geographic location

Found in many layers of the same rock
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