Concentration is the amount of a substance in a given volume.

True or False

Answer:

True?

Explanation:

Answer:

i think its true but im not to sure

Explanation:

The concentration of a substance is the quantity of solute present in a given quantity of solution. Concentrations are usually expressed in terms of molarity, defined as the number of moles of solute in 1 L of solution.

Determine the number of atoms in the following chemical formulas. Make sure you list the elements, how many atoms of each element, and how many total atoms. Numbers 1 and 6 have been completed as examples.

8NaCl = 8+8=16 (To find the total number of atoms add the total number of atoms)
Na=1x8=8 (remember to multiply the subscript by the coefficient)
Cl=1x8=8

H₂SO₄ = _______
H=
S=
O=

4KNO₃ = _______
K=
N=
O=

CaCl₂ = _______
Ca=
Cl=

3C₂H₆ = _______
C=
H=

Irrigation is a method used to water farm land. Identify two effects irrigation has on the water cycle and environment. A Irrigation can decrease the Earth's temperature, B. Irrigation can produce run-off that pollutes streams and rivers with fertilizers, C. Irrigation can cause erosion and take nutrients from the soil or D. Irrigation can increase global winds.
Please help and explain well because I really don't understand.

Guillermo was finding it difficult to walk up the steps to his family’s apartment. His doctor thinks that his cells might not be getting enough oxygen or glucose Why does having low levels of glucose or oxygen in his cells make it difficult for Guillermo to walk up steps? (Sentence starter: It is difficult for Guillermo to walk up steps because...

Which of the following is the best example of chemical weathering?
a Limestone rocks dissolving in water

b Plant roots growing through concrete and cracking it

c Waves carrying sand away from a beach

d A large rock splitting into pieces because of ice

Which wave has a wavelength that is most likely seen as red light?

In two to four sentences, explain how you ranked the plants from most desirable to least desirable. Be sure to cite evidence from the data to support your rankings.

If energy is released or absorbed during a chemical reaction, where is the energy going?

Susanna was hiking in the mountains, and she discovered an interesting, shiny rock. She wondered if this sample was actually a rock or if it might be a mineral. As she observed it more closely, she noted that it was solid and naturally occurring, with a definite chemical composition. The sample did not appear to have a crystal structure.
Could Susanna have found a mineral? Explain why or why not.
please help me out

A map. The map shows the physical features of the Fertile Crescent. The Fertile Crescent begins at the northern end of the Persian Gulf, continues north and west following the Euphrates River and Tigris River, and narrows down the western coast of the Syrian Desert ending in Upper Egypt. The empires of Mesopotamia, Akkad, Babylonia, and Sumer are within the Fertile Crescent. East of Sumer are the Zagros Mountains. Use the drop-down menus to identify the physical features on the map. The area south of the Fertile Crescent is the . The body of water that crosses the Fertile Crescent is the . One body of water that borders the Fertile Crescent is the . One physical feature located east of the Fertile Crescent is the .

Which statement describes the condition in which diamonds form?
A. They grow underground, in most regions of Earth
B. They form as water evaporates on the shore any body of water
C. They form deep underground, in certain areas that are under a great deal of pressure
D. They form as water evaporates on the shores of very salty bodies of water

5. How does skin keep germs from getting in your body? (1 point) Cells have many layers to protect us.


6. How do the students enter the lower layers of Arnold’s and Pheobe’s skin? (1 point)

7. Your body is made of living cells that _________ and ________________. (2 points)


8. In which organ do the students discover that Sea Weedies are actually orange in color? (1 point)

9. The ________________ is the organ that absorbs all the good things and nutrients from the food we wat, and transports it to the blood stream. (1 point)


10. The __________, also made of cells, move food into the ________________________. (1 point)


11. What are some of the different types of body cells that Ms. Frizzle lists (at least 3)? (3 points)


12. As Ms. Frizzle says, “We are what we ____!” What does she mean by this phrase? (2 points)

13. Roughly how long would it take for new skin cells to regenerate and grow from the bottom layers, then reach the surface of the skin? (1 point)

Israel observed a bolt of lightning during a storm. Which form of energy does a bolt of lightning produce?
A. light C. nuclear
B. mechanical D. potential

The diagram below shows part of the rock cycle. (4 points)
Rock cycle with a volcanic eruption at the top. Moving counterclockwise, there is an arrow pointing to Rock B. From Rock B there is an arrow labeled sediment and compaction pointing to Rock C. From Rock C there is an arrow labeled heat and pressure pointing to Rock A. From Rock A there is an arrow labeled magma pointing back to volcanic eruption.
Which type of rock does B represent?
Answer Choices
1)Igneous rock
2)Metamorphic rock
3)Rock formed by compaction
4)Rock formed by heat and pressure

Which material absorbs the MOST solar radiation? a.Sand b.Grassy Field C.Fresh snow d.Forest

Which is not needed for a hurricane to form?

I'm in need of help! Thanks.

Please help me I will give you the brain thing and extra points. image below part

Which of these events leaves small pieces of rocks in new places?
a Deposition

b Weathering

c Erosion

d Oxidation

i need help with this pls answer this asap

What is a doldrum?


a. a calm area of sinking air

b. when wind blows East to West

c. a calm area of rising air

D. When wind blows West to East

Which of the following is an example of chemical weathering?
a Frost wedging

b Animal activity

c Plant growth

d Acid rain

There are many ways that you can tell whether a chemical change has occurred. Which of the following is NOT a sign of chemical change?

-presence of bubbles
-liquid boiling
-change in color
-a release of an odor

Which of the following is an example of physical weathering?

a frost wedging

b Acid rain


c Oxidation


d Carbonic acid

Dr. Grey performed an experiment to test how temperature affects activity levels in mice. She put one group of mice in a cold environment and another group of mice in a hot environment. Everything else about the two environments was the same, including the type and amount of food and water. She allowed the experiment to last for a few generations of mice and tested the activity levels of the different groups. There was no change in the activity levels of the mice, but she noticed that the mice in the cold environment had much darker, thicker fur than the mice in the hot environment. What scientific question could she ask based on her results? A. Does temperature have an effect on fur color and thickness in mice? B. Do the mice in the cold environment run faster than the mice in the hot environment? C. Which group of mice is the most attractive? D. Does food type have an effect on fur color and thickness in mice?

TRUE OR FALSE 3 QUESTION If the statement is true, write true. If the statement is false, change the capitle word to make the statement true.

1) Cell growth and production of new organelles and enzymes are
characteristics of PROPHASE.

2) It would take FIVE cell divisions for one original cell to produce 128 new cells.

3) he two rod-like parts that make up a chromosome are called
CHROMATIDS.

Help Please! Thanks!

Calculate the estimated density of each ball. Use the formula

D = m/V
where D is the density, m is the mass, and V is the volume. Record your calculations in Table A of your Student Guide.

Given that the density of water is 1.0 g/cm3, make a prediction about whether each ball will float in water. Record your prediction in Table A.

What is the estimated density of the table tennis ball? Record your answer to the nearest hundredth.

_______g/cm3

What is the estimated density of the golf ball? Record your answer to the nearest hundreth.

________ g/cm3

what are at least 6 compounds of potassium ?

If a solution contains all the solute it can hold at a given temperature, it is said to be ________________

A.) dilute
B.)saturated

Guillermo was finding it difficult to walk up the steps to his family’s apartment. His doctor thinks that his cells might not be getting enough oxygen or glucose Which body systems should the doctor test in order to find out whether Guillermo’s cells are getting enough oxygen and glucose and why? (Sentence starter: The body systems Guillermo should have tested are...