Answer:
. an air-conditioning system
a student places iron metal over a flame, and begins to react with oxygen gas in the air. A red, powdery solid begins to form on the iron. What is the name of the red solid?
Answer:
Iron, as well as iron alloys, rusts because of a chemical reaction known as oxidation. When iron is exposed to moisture or oxygen, oxidation occurs. During this chemical reaction, iron is converted into iron oxide
Which state(s) of matter is/are easily compressible? Select all that apply
solid
liqued
gas
Answer:
gas is the answer
Explanation:
gasses are characterized by having no definite shape or volume.
On what two days would the UK, Chile, South Africa, and Japan have an equal amount of day and night? O Winter Solstice and Summer Solstice 0 Spring Equinox and Fall Equinox 0 Fall Equinox and Summer Solstice O Winter Solstice and Spring Equinox
Group 8A (noble gases) don’t react with other elements because
a
they can have either a positive or a negative charge.
b
their outermost energy level is missing one electron.
c
their outermost energy level is full.
d
they readily form positive ions.
How do you determine the name of an element using protons, neutrons, and electrons?
Answer:How do you determine the name of an element using protons, neutrons, and electrons?
By knowing the number of protons, you know the atomic number. If you know the atomic number you know which element it is in the Periodic Chart. A good Periodic chart should give you enough information to determine the name of the element.
Explanation:
please mark me as brainliest
Calculate how many moles of potassium (K) are present in a sample of 8.12x10^23 atoms of K
Answer:
1.35 moles
Explanation:
Calculate how many
of potassium (K) are present in a sample of 8.12x10^23 atoms of K
6.02 X 10^23 atoms are 1 mole. how many 6.02 X 10^23 are in
8.12 X 10^23
divide 8.12 X 10^23 into sets of 6.02 X 10^23
(8.12 X 10^23)/(6.02 X 10^23) =1.35 moles
How does the equation below support the idea that matter is not created or destroyed?
6H20 + 6CO2 -----> C6H12O6+ 602
Answer:
The reaction 6CO2 + 6H2O ---> C6H12O6 + 6O2 is the chemical equation for photosynthesis. In this reaction, carbon dioxide and water
Explanation:
give me brainlest please
how does an indicator work
Answer: Indicators are substances whose solutions change color due to changes in pH
Explanation:
Answer:
EXPLANATION
Explanation:
[not sure exactly what you mean by indicator but here's my very basic answer lol] They are substances that change color due to changes in pH levels.
Erosion and weathering _____.
are usually slow processes
can only happen in dry climates
do not change landforms
do not significantly change Earth's surface
is stretching a rubber band endothermic or exothermic
Answer:
exothermic
Explanation:
take a rubber band between the first two finger of each hand
stretch it, release, stretch is release over and over fast
put the rubber band on you cheek and feel the heat
You RELEASED HEAT, HEAT CAME OUT, HEAT EXITED THE RUBBER
so the process is EXO(EXITS)-THERMIC (HEAT)
Gay-Lussac's Law explains how the temperature of a gas is related to its' .
Answer:
volume
Explanation:
口
10. Which describes an element?
O They can combine with other elements to form atoms.
They were created in the Earth's core.
O They cannot be broken down any further.
O They were all discovered at the same time.
Someone just help me fr UWU
Answer:
They were created in the Earth's core.
The rest make no sense
What is an observation of matter that is measured without changing the identity of the substance.
a. A physical Property
b. A chemical property
c. A physical change
d. A chemical change.
A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. Physical properties include color, density, hardness, and melting and boiling point.
Explanation:
Physical Property. have a great day..
Identify which level of organization is shown in the pictures. choose from the box. some words may be used more than once
Words in box: Organism, Cell, Tissue, Organ, Organ System
Answer:
1) Organ
2) Organism
3) Organ System
4) Tissue
5) Cell or Tissue (im not sure)
6) Organism
7) Organ
8) Organism
9) Organism
A gas has a volume of 0.215 L and a temperature of -20.0 oC. The gas is heated to 60.0 oC at constant pressure. What will happen to the volume of the gas
Answer:
V1/T1 = V2/T2
we must convert temperature from °c to kelvin
so T1= -20+273.15=253.15
and T2 = 60 +273.15= 333.15
0.215/253.15= V2/333.15
V2= 0.28L
hence, volume increases a little bit
Look at the window on the left side of the simulation. It shows the reaction A + BC ⇌ AB + C. How does this reaction differ from the reaction by which ammonia is synthesized?
Answer:
A + BC → AB + C "single replacement reaction" while ammonia synthesis is a "synthesis reaction".
Explanation:
A single replacement reaction, is a reaction by which one element replaces an/other element in a compound.
It can be represented generically as: A + B-C → A-C + B This will most often occur if A is more reactive than B, thus giving a more stable product.
A synthesis reaction is a type of chemical reaction in which two or more simple substances combine to form a more complex product. The reactants may be elements or compounds, while the product is always a compound.
Example: ammonia synthesis,
N₂ + 3H₂ ⇄ 2NH₃
I need help with this
Answer:
I think that 142.5 is the answer.
what is the volume of the graduated cylinder what is the volume of the graduated cylinder
Answer real 100% Graduated cylinders commonly range in size from 5 mL to 500 mL. Some can even hold volumes of more than a liter.
PLEASE HELP ASAP
Question 2 of 10
Which is required for karst topography to form?
A. Limestone
B. Basalt
C. Quartz
O D. Granite
Answer:
Limestone
Explanation:
Limestone is required , hope it helps :)
A is the answer
Answer: Karst is a topography formed from the dissolution of soluble rocks such as limestone, dolomite, and gypsum. It is characterized by underground drainage systems with sinkholes and caves
answer asap please!!!!!!!!!!!!!!!!!!!!!
Answer: c.
Explanation: Because it will increase temperature on thermometer y will decease.
Muscle Activity
A
B
с
8. The flow of energy through an ecosystem
Sun Food ATP
involves many energy transfers. The diagram
below summarizes the transfer of energy that
eventually powers muscle activity. The process of cellular respiration is
represented by
a. arrow A, only
c. arrow B, only
b. arrow C, only
d. arrows A. B. and C
WILL MARK AS BRAINLIEST IF CORRECT
[tex]\huge\bold{\purple{\bold{⚡Q16. B⚡}}} [/tex]
Because: The balanced equation is - 2BrF5--->Br2+5F2[tex]\huge\bold{\orange{\bold{⚡Q17.A,C,E⚡}}} [/tex]
A because 2 is in subscriptNot B because there are 3 atoms of oxygen in ozone, not in oxygen. C because 3 indeed is its coefficient Not D because 3 is coefficient not subscriptE is trueNot F because 3 is a coefficient, not 2
When forming an ionic bond, how does the configuration of valence electrons change
Answer:
Ionic bonds are a class of chemical bonds that result from the exchange of one or more valence electrons from one atom, typically a metal, to another, typically a nonmetal. This electron exchange results in an electrostatic attraction between the two atoms called an ionic bond.
Explanation:
Answer:
The electrons are transferred from one atom to another. The atom that loses electrons becomes positive.
Explanation:
I don't really understand what form of an answer you need but I hope this helps?
Now experiment with the simulation. Send waves of various sizes at the three houses. See how large a wave has to be to destroy each kind of house. Write down your observations.
Answer:
Brick House: 22 feet
Wood House: 10 feet
Straw house: 5 feet
Explanation:
Which of the following is the correct path of light through a reflecting telescope?
eyepiece → primary mirror → secondary mirror → eye
primary mirror → eyepiece → secondary mirror → eye
primary mirror → secondary mirror → eyepiece → eye
secondary mirror → primary mirror → eye → eyepiece
Ice waters melt to form liquid water The water spreads out to match the shape of its container after heating on the stove the water begins to boil and change into steam which statement is true about this process
Answer:the water starts to boil and creates steam
Explanation:
What is true about wind?(1 point)
Wind can only be warm.
Wind can only be warm.
Wind cannot cause things to move.
Wind cannot cause things to move.
Wind can be still.
Wind can be still.
Wind is always safe.
Wind is always safe.
Answer:
safe? I guess it to me
Answer:
I think c.
Explanation:
I am not sure tho
In a circus, a 50 kg clown is shot out of a cannon at 20 m/s. What is his momentum?
Answer: 1000 kg * m / s
Explanation:
momentum is equal to mass times velocity!
50 times 20 is
1000
so momentum is 1000 kg * m/s
Explain the different types of chemicals?
What is the Molarity of a Ca(OH)2 solution if 30.0mL of the solution is neutralized by 26.4mL of 0.25M HCI
solution?
Answer:
0.11M
Explanation:
What is the Molarity of a Ca(OH)2 solution if 30.0mL of
the solution is neutralized by 26.4mL of 0.25M HCI solution?
1L (1000 ml) of the HCl contains 0.25 moles of H ion
26.4 ml contains ( 26.4 X0.25/1000) moles of H ion ion
=0.0066 moles H ion
2HCl +Ca (OH)2-----> 2H2O +CaCl2
SO 2 H IONS NEUTRALIZE 1 Ca(OH)2 MOLECULE
00066 moles H ion neutralize 0.0033 moles Ca(OH)2
the 0.0033 moles are distributed over 30 ml, so the concentration of the
Ca(OH)2 IS 0,0033/(30/1000) =0.11 moles/liter or 0.11M
identify ways to reduce the risk of liquid bumping while heating.
The most common way of preventing bumping is by adding one or two boiling chips to the reaction vessel. However, these alone may not prevent bumping and for this reason it is advisable to boil liquids in a boiling tube, a boiling flask, or an Erlenmeyer flask.
