Answer:
Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding. Often, physical changes can be undone, if energy is input.
Explanation:
Is acid a chemical weather
Yes or no
Is carbon dioxide a chemical weather
Yes or no
Is water a chemical weather
Yes or no
Is oxygen a chemical weather
Yes or no
Answer:NO
Explanation:NO
What is the mass of 15 ml of aluminum if the density is 2.70 g/ml?
Answer:
40.5g
Explanation:
desnity = mass/volume
2.7 = mass/15
mass = 2.7 x 15
mass = 40.5 g
can you guys help me please? I dont get what im supposed to do here.
Which substances from the simulation are more alkaline than water?
Which
Answer:
The substances more alkaline than water are;
1) Spit, 2) Blood, 3) Hand Soap, and 4) Drain Cleaner
Explanation:
The diagram in the simulation displays a list of liquid substances, arranged from bottom to top in the order of increasing alkalinity.
The ph of water is 7.0
The ph of spit (saliva) is between 6.2 and 7.6
The ph of blood is about 7.4
The ph of hand soap is between 9 and 10
The ph of drain cleaner is between 12 and 14.
4. Which elements would have similar properties to potassium?
A. Lithium and Sodium
B. Bromine and Krypton
C. Calcium and Scandium
D. Cobalt and Rhodium
Answer:
The answer is A. Lithium and Sodium
Explain in your own words what chemical change is
Answer:
A chemical change happens when one chemical substance is transformed into one or more different substances, such as when iron becomes rust.
Explanation:
Answer: when one chemical substance is transformed into one or more different substances.
Explanation:
Bill Nye said the air pressure makes things what?
Billy is trying to figure out what type of wood to use for building a model boat. He has a block of wood with a volume of 8.0 cubic centimeters (cm3) and a mass of 4.0 grams (g). What is the density of the block of wood in g/cm3 to the nearest tenth?
A 0.5
B 2.0
C 4.0
D 32.0
Answer:
A; 0.5
Explanation:
To find the density, you have to do the Mass divided by the Volume; in this case, it's 8.0/4.0.
8/4 = 0.5
Zinc has an average atomic mass of 65.37 amu. Jack is trying to figure out what the most abundant isotope of zinc is, but he doesn't have access to the internet, so the average atomic mass is the only information he has. Jack decides to made an educated guess as to the most abundant isotope of zinc by assuming there are only two isotopes of zinc. If Jack assumes there are only two isotopes of Zn, what he be most likely to decide is zinc's most abundant isotope?
Question 5 options:
Zinc-64
Zinc-65
Zinc-68
Zinc-66
Zinc's most abundant isotope : Zinc-65
Further explanationIsotopes are atoms whose no-atom has the same number of protons while still having a different number of neutrons.
So Isotopes are elements that have the same Atomic Number (Proton)
Atomic mass is the average atomic mass of all its isotopes
In determining the mass of an atom, as a standard is the mass of 1 carbon-12 atom whose mass is 12 amu
Mass atom X = mass isotope 1 . % + mass isotope 2.%
To decide zinc's most abundant isotope, then choose the closest mass number
or we can check the difference with the average mass number, if the value is the smallest, then that isotope has the largest abundant
Zinc-64[tex]\tt \dfrac{65.37-64}{65.37}=0.021[/tex]
Zinc-65[tex]\tt \dfrac{65.37-65}{65.37}=0.005[/tex]
Zinc-68[tex]\tt \dfrac{68-65.37}{65.37}=0.04[/tex]
Zinc-66[tex]\tt \dfrac{66-65.37}{65.37}=0.009[/tex]
The closest = Zinc-65(the smallest)
Express the measurement using the appropriate SI prefix. For example, 10.72 x 103m is the same as 10.72 km because the “k” stands for 103
8.09 x 10-6g
(I got super stuck on this)
Answer:
[tex]10.72 \times 10 {}^{3} m = 10.72km \\ 8.09 \times 10 {}^{ - 6} g = 8.09 \times 10 {}^{ - 9} kg \\ \\ note : \\ to \: convert \: to \: \: k(units) \: you \: divide \: the \: value \: by \: {10}^{3} . \\ 5m \: to \: km \: will \: be : \\ \frac{5}{1000} km = {5 \times 10}^{ - 3} km[/tex]
Pleaseee help ASAP
will mark brainliest!!! <3
Answer:
Fluorine belongs to the group 7 A so it must have 7 electrons in the oribits so the answer would be A as u count the electrons in the orbits, There are exactly 7 electron
Explanation:
If Maria winks exactly 5 times every minute while she is awake and she sleeps exactly 8 hours a day, how many times does Maria wink in a day? winks/day.
Answer:4,800
Explanation:
5 winks a minute, 60 minutes in an hour.
300 winks an hour, 16 hours a day.
4,800.
Answer:
The answer is 4,800 winks per day.
Explanation: There are 24 hours in a day, 24 minus the 8 hours shes asleep is 16. There are 60 minutes in an hour. 5 x 60 is 300. 300 winks an hour multiplied by the 16 hours she's awake is 4,800.
How does the snake's skull allow it to eat large prey?
A. The jaw can crush the prey,
B. The teeth can grind the prey.
O C. The jaw can open wide around the prey.
D. The teeth can lock together around the prey,
Which characteristic of a substance is considered a chemical property?
its boiling point
its reactivity
its density
its conductivity
Answer:
Reactivity
Explanation:
a chemical reacting to another chemical is considered a Chemical property because chemicals react with other chemicals differently. Pls PLs give me brainliest
Answer:
reactivity
Explanation:
Why does oil float and not sink?
Answer:
because it has more density than water
Answer:
This is because oil is less dense than water and therefore it floats to the surface.
Which statement best describes how entrepreneurship affects a society's
economy?
A. It encourages people to take risks to create new products.
B. It organizes the people who help a business operate.
C. It provides the raw materials needed to produce goods.
D. It supplies businesses with the tools they need to function.
Answer:it’s a
Explanation:cause
what is the term for photosynthesis
Describe the three phases of matter (solid, liquid, and gas) in terms of particle spacing, ability to fill shape and volume of container, energy of particles , and strength of intermolecular forces
Answer: solids are tense but spread out. Gas is spread out completely and liquid is all together
Explanation:
This element has 2 fewer protons than Titanium. What element is it?
Answer:
calcium.
Explanation:
because of
thanks
A 10-kg ball is accelerated 500 m / s2 by a force of
Answer:
The answer is 5000 NExplanation:
The force acting on a body can be found by using the formula
force = mass × accelerationFrom the question
mass = 10 kg
acceleration = 500 m/s²
We have
force = 10 × 500
We have the final answer as
5000 NHope this helps you
Compare and Contrast Heating and
Cooling curves.
Answer: Heating curves show how the temperature changes as a substance is heated up. Cooling curves are the opposite. They show how the temperature changes as a substance is cooled down. Just like heating curves, cooling curves have horizontal flat parts where the state changes from gas to liquid, or from liquid to solid.
Explanation: Have a blessed day hopefully this helped!
What subatomic particle identifies any type of
atom?
Answer:
hope it helps..
Explanation:
Number of protons
More information: The atomic number is used to identify an element, and the atomic number is the number of protons in the nuclei of an element. Every element has its own unique number of protons, and therefore, atomic number.
Help plsss!
If the average atomic mass is 39.948amu, which isotope is more abundant?
Answer:
It depends on which element you are talking about. I appears that no element has an average atomic mass of that number. So, for the question, if it assumes that there are two isomers with 39 amu and 40 amu, then the 40 amu one would be more abundant. But again, there are different possible isotopes and I can't tell what the question wants.
what is chemistry about
Answer:
Explanation:
Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything.
Answer:
its the science that deals with the properties, composition, and structure of substances like elements and compounds, the transformations they undergo, and the energy that is released or absorbed during these processes
helpppp
Chemical bond formation might take place due to the interaction between a(n) _______ and an anion
A.magnetic
B.valence
C.electrostatic
D.cation
PLEASE HELP IM ON A TIME LIMIT!!!!
Which mathematical statement shows the relationship between gravity and mass?
F g ~d^/m
F g~m/d^2
F g ~ m/d
F g ~m^2/d
Answer:
The corect answer is F g~m/d^2
Explanation:
Answer:
F g~m/d^2
Explanation:
what is the mass of 4.900 x 10^25 atoms of He
plz help meeeeeeeeeeeee
PLEASE SOMEONE HELPP
Answer:
D
Explanation:
A scientist is studying the liquid shown here. She thinks the liquid is a mixture. Describe an investigation she could do to demonstrate that the liquid is in fact a combination of substances.
( please help it’s due today lol! i will mark your answer as brainliest or whatever .)
Answer: Measure the density
Explanation: pretty sure the density could identify if it is a mixture or a pure substance