Chemistry Middle School

Please help asap!! How many groups did Mendeleev's original Periodic Table of Elements have?

A) 18

B) 5

C) 13

D) 8

Answers

Answer 1
The columns, called groups, contain elements with similar chemical behaviours. Six groups have accepted names as well as assigned numbers: for example, group 17 elements are the halogens; and group 18 are the noble gases.




Hope this helps :)

Related Questions

HELPPPPP
Which item is made from a basic ingredient?

answer choices

Soda

Wine

Leafy vegetables

Toothpaste

Answers

Answer:

Leafy vegetables?

Explanation:

If by a basic ingredient you mean a single ingredient then the answers is leafy vegetables

Please answer this!!!!!!!!!!!!!

Answers

What’s the question?

Answer:

oo ok and please i like your pfp

ANSWER ASAP!!

In your own words name two types of acids and two types of bases. Describe how each are used..

Answers

Answer:

Acids sulfuric acid, hydrochloric acid. Bases ammonia water, sodium hydroxide.

Explanation:

Answer:

Acids sulfuric acid, hydrochloric acid. Bases ammonia water, sodium hydroxide.

Explanation:

please help!will give brainiliest

Answers

Answer:

nuetrons

Explanation:

some helium atoms just a little thick and packing extra neutrons

Neutrons is the correct answer

HELP THIS IS SCIENCE I HAVING TROUBLE

Answers

Answer:

1/2 of the way down

Explanation:

Answer is 1/2 way down

For thousands of years, scientists didn’t know cells existed. What major invention helped open their eyes to the world of cells?

The invention of the wheel allowed for faster travel allowing scientists to meet to discuss new ideas.
The invention of the telegraph allowed for faster communication between scientists.
The invention of the microscope allowed scientists to see smaller things in greater detail.
The invention of the telescope gave scientists an opportunity to magnify larger things in greater detail.

Answers

Answer: microscope?

Explanation:

I'm not exactly sure it could even be an invension of some kind of test or experiment

PLS HELP!! WILL GIVE BRAINLY!!

Answers

Answer:

2. Mechanical

3. Chemical

4. Mechanical

5. Mechanical

6. Chemical

7. Mechanical

8. Mechanical

9. Mechanical

10. Chemical

Explanation:

what answer should i put and the box right answer will get brainliest

Answers

Answer: x + 20

Explanation:

MARKING BRAINLIEST!!
Objective(s):
In your own words, what was the purpose of this lab?


Hypothesis:
In this section, please include the if/then statements you developed during your lab activity. These statements reflect your predicted outcomes for the experiment.

If predators are increased, then the cricket frog population will (increase/decrease/stay the same) over the span of five years.

If pollution is increased, then the cricket frog population will (increase/decrease/stay the same) over the span of five years.

If the amount of food available is increased, then the cricket frog population will (increase/decrease/stay the same) over the span of five years.


Procedure:
The procedures are listed in your virtual lab. You do not need to repeat them here. Please be sure to identify the test variable (independent variable), outcome variable (dependent variable), and control group for this experiment.

Reminder: The test variable is the item that is changing in this investigation. The outcome variable is the item that you are measuring in this investigation. The control group is the group in the experiment where the factors being tested are not applied. It allows scientists to set a baseline to compare the experimental groups that do have factors applied to them.

Test variable (independent variable):

Outcome variable (dependent variable):

Control group:


Data:
Record your data from each trial in the data chart below:

Type of Factor Beginning Frog Count Simulation 1 (Low) Simulation 2 (High)
Predators (alligators)
Pollution
Food (mosquitoes)
Graphs
Use the graphs you printed from the data chart in the virtual lab and analyze the data. Make a note of any trends that you discover.

Predators (alligators):
Pollution:
Food (mosquitoes):


Conclusion:
Your conclusion will include a summary and an interpretation of the lab results. Please write in complete sentences.

Which limiting factor(s) in this lab simulation are biotic?
Which limiting factor(s) in this lab simulation are abiotic?
Which limiting factor impacted the cricket frog population the most? Use evidence to support your answer.
Which limiting factor impacted the cricket frog population the least? Use evidence to support your answer.
Mosquitoes can carry and transmit disease to animals and humans. Explain how the cricket frog plays an important role in limiting the spread of mosquito-borne illnesses like West Nile virus and malaria.
Predict the long-term effects of these limiting factors on the cricket frog population in the pond ecosystem.

Answers

Answer:

IT CAN PROVIDE RESEARCH THAT CAN FIGHT THEORIES AND ARGUE OTHERS

HOPE THIS HELPS THIS IS MY FIRST ANSWER

(PLZ MARK ME BRAINLEST)

Choose three different items that are magnetic.

Answers

Answer: magnet, fridge and uh......metal

Explanation:

Answer:

Heres a few, I hope this is what you are talking about :)

Iron

Nickel

Cobalt

Neodymium

Speakers

Earbuds

Headphones

Cabinet Latch

Explanation:

What are weather balloons? (3 points)
a Locations with instruments that measure weather conditions in specific land areas

b Numerical equations based on weather-related factors that forecast weather

c Objects that carry instruments into the stratosphere to measure atmospheric conditions

d Structures that orbit Earth in the exosphere to capture images and collect data

Answers

c! objects that carry instruments into the stratosphere to measure atmospheric conditions
The answer is c, they measure the conditions of the atmosphere to gather weather information

What biome/environment do you find at the high and dry belts?

a Tropical rainforests
b Temperate forests
c Deserts
d Tundra

Answers

The biome that has high and dry belts is deserts
The answer to your question is c, Deserts!

Let’s say there are 2 planets similar in size, but one has much more mass. How will that affect the number of moons?

Answers

Answer:

0 because no value of mass at to be same

No value of mass is the same

Hi! Which of the following decreases kinetic energy of solvent molecules? ( I need this handed in quickly!)
A. Decreasing the pressure
B. Not stirring the solution
C. Decreasing the contact area between solvent and solute

When a drop of water sits on a leaf, It looks like it has a skin. What is this “skin” a result of? Explain.

What does adding soap do in terms of dissolving solutes? Explain.

Which solution will contain a higher concentration of iodide ions, 0.25 mol/L calcium iodide or .45 mol/L potassium iodide?

Thank you so much! I hope you have a great day!❤️

Answers

Answer:

c

Explanation:

According to the forces of attraction, decreasing the contact area between solvent and solute decreases kinetic energy of solvent molecules.

What are forces of attraction?

Forces of attraction is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

Learn more about forces of attraction,here:

https://brainly.com/question/23841038

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What is true in a saturated solution?
A. No more solute can be dissolved.
B. No more solution can be made.
C. The concentration cannot be decreased.
D. No more solvent can be dissolved.

Answers

Answer:

A ) because no more solute can be dissolved

The correct answer is A
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