The combination
nation of two or more atoms from same or different elements creates a(n)

electrons are one of the ________, or pieces, that make up an atom

help it is due tomorrow ​

Suppose that 273 g of the substances listed displaces 26 mL of water. What is the substance?

Substances:
Zinc=7.13
Silver=10.50
Lead=11.35

How many hydrogen atoms in 5 H2O?
[ Select ]
A:3
B:10
C:7
D:5
How many oxygen atoms in 5 H2O?
Select
A:3
B:10
C:7
D:5

How many different types of atoms in 5 H2O?
[ Select ]
A:10
B:3
C:7
D:5
How many total atoms in 5 H2O?
[ Select ]
A:10
B:3
C:5
D:2
5 H2O is a
A: element
B: compound

In which of the following examples would you see a chemical change occur?

A. Candle wax melting
B. Lighting a match
C. Salt dissolving in water
D. Water freezing

Which phrase provides the best definition of a landform region?

a large area where the topography contains the three main landforms
the border where two different landforms meet
a large area where the topography is made up of one landform
a large area where the topography is inconsistent and contains multiple landforms

Describe one example of an energy transformation in this diagram and explain why it is a transformation. Repeat this description and explanation for an energy transfer.

If it rained, what would be the deepest layer the water would go through?

If you weighed the atoms that appear on the reactant side of the equation, would they have the same mass as the atoms that appear on the product side? for N2 + H2 -> NH3

1) a cold air mass and meets warm air mass. what will happen, in terms of the difference in their densities?


2) archie needs to find the density of an intricately crafted crown, to see if it is pure gold. he has no trouble measuring mass, but he doesnt know what to do next. what should he do?


I NEED HELP PLEASEEE

Which element would react faster with oxygen because of the properties it possesses?
Berryllium, Potassium, Neon, Barium

Does stirring a liquid make it cool down faster?

Hello brainly user can you help me out thanks!

list the following items from smallest to largest

Grain of salt
E. coli bacteria
human
water molecule
skin cell

Correctly sequence the following from smallest to largest in mass: protons, atom, electrons.

Buying fruit and vegetables needs to be done more often as these types of foods can quickly go rotten. What could you do to slow down the chemical change of fruits and vegetables rotting? Give a reason to support your answer.

what is the product of a physical or a chemical change?

You decided you want to make spaghetti for supper. You first light the gas stove because you need to cook the meat. When the meat is cooked, you add sauce to it. Then you put a pot of water on the stove to get it boiling. The next step is putting the spaghetti noodles in to boil. Finally, you drain the spaghetti noodles and add the sauce. Which of the following describes the chemical changes happening?

A Cooking the meat and boiling the water are both chemical changes.
B Lighting the stove and cooking the meat are both chemical changes.
C Light the stove with a match and boiling the noodles are both chemical changes.
D Mixing the pasta sauce with the meat and boiling the noodles are both chemical changes.

2H2+O2→2H2O
There are four atoms of hydrogen (H) before the reaction. How many atoms of hydrogen are present after the reaction?

4

8

5

2

Which is the highest peak of North America?

can u help me and ty :))

In recording data, it is important to use the proper unit. Which unit is used to measure how warm or cool the air is?
liters (L)
grams (g)
millimeters (mm)
degrees Celsius (°C)

Which of the following happens to a material when it goes through a chemical change?

A The substance changes size.
B The substance changes state.
C The substance changes shape.
B The substance changes into a new substance.

Which of the following is the best way to explain how baking a cake or frying an egg is a chemical change?

A Both are changing size and shape.
B Heat is changing the texture of both substances.
C Heat is being added to both, causing a phase change.
D The end products of both cannot be reversed to their original forms.

All the balls described below are the same size. Which of the balls has the highest density?
A. a ball filled with plastic
B. a ball filled with feathers
C. a ball filled with air
D. a ball filled with solid metal

What do I do when I have A test on Measuring and Density


How do I measure the length?

What are characteristics of metals? What is the only metal that is a liquid at room temperature?

In this experiment, you will measure mass and volume of various sport balls, both regularly shaped ball and irregularly shaped. What property of an object can you determine using mass and volume? In the space below, write a scientific question that you will answer by doing this experiment.

One of the major ways humans depend on marine plants is for which of the following?

A.) Production of oxygen

B.) Regulation of ocean temperature

C.) Increasing atmospheric carbon dioxide

D.) Maintaining the concentration of salt

1) you are building a model plane that needs small block inside to balance its weight. you find that the block material you are using has half the density you thought it did. you still need the same weight for the blocks in the plane, and they must have the same width and length. how you can keep the weight the same?


2) your teachers set two cups on a bench at the front of the class. one contains water dyed blue and the other clear water. the teacher says one cup is very salty water and the other one is freshwater. how would you figure out which one is salty and which one is fresh.


3) In much of the world, SI units are used everyday life and not just in science. why would it make sense for people in the united states to use SI in everyday life, too? explain using math terms such as calculate and convert.



HELP ME PLEASEE

Eriq, a chemist, is running tests with four unknown elements. He has found that they all bond the same way, so he knows that they are in the same group on the periodic table of elements. The table shows other properties that Eriq observed.

A 4-column table with 4 rows titled properties of four unknown elements. The first column titled element number has entries 1, 2, 3, 4. The second column titled melting point has entries 266 K, 172 K, 387 K, 53 K. The third column titled boiling point has entries 332 K, 239 K, 457 K, 85 K. The fourth column titled phase at room temperature has entries liquid, gas, solid, gas.

These four elements are most likely in group

15.
16.
17.
18.