Answer:
Didi you get it?we got the same class
Explanation:
When copper metal is heated to 1100 oC it melts. Is this a chemical or physical change? Explain your answer
Answer:
it is a physical change
If the chemical reaction AB + CD → AD + BC releases heat, what is true of the stored bond energy of the reactants and products?
Answer:
Being a reaction that releases heat, it is considered exothermic.
Explanation:
That is why if we consider it exothermic, the heat that is released to the medium is chemical energy lost from the interaction between the chemical bonds throughout the reaction. Having said this, we can affirm that the energy of the links of the products IS LESS than that of the REAGENTS, otherwise it happens in the endothermic ones, where it occurs in a vice versa.
These processes tend to have greater entropy and greater disorder in the reaction, greater kinetic energy between the particles.
Density = Mass / Volume Density = 35.062g / 23.50 mL =
Answer:
Density = 1.492g/mL
Explanation:
hope that will help you
A solid block with a length of 6.0 cm, a width of 3.0 cm, and a height of 3.0 cm has a mass of 146 g. What is the block’s density? Show all work.
What are major companies that sell most plastic straws ?
Answer:
One of the biggest global suppliers of plastic straws is Tetra Pak:
Plant cells have large central ________________ . These are also found in animal cells but are much smaller Question 3 options: Chloroplast Vacuole Mitochondria Cell Membrane
Answer:
vacuoles
Explanation:
Vacuoles are not only found in animal and plant cells, but on every given diagram vacuoles are huge and singular on a plant cell. Animals however, there are multiple and are much smaller
To produce 3.00 L of a 1.90 M solution of sodium hydroxide (NaOH), how many grams of sodium hydroxide must be dissolved?
Therefore, to make 3.00 L of a 1.90 M solution of sodium hydroxide, 228 grammes of sodium hydroxide must be dissolved.
For a 1M NaOH solution, how much NaOH dissolves in 1 gallon of water?We need to dilute 40 grammes of sodium hydroxide in one litre of water in order to create a solution with a 1 molar concentration. You can make 1M NaOH solution by weighing 39.9 g of NaOH granules and dissolving them in 1 litre of water.
We can use the following method to calculate the mass of sodium hydroxide needed to make the solution:
m = M × V × MW
where:
m = mass of solute (in grams)
M = molarity of the solution (in moles per liter)
V = volume of the solution (in liters)
MW = molecular weight of the solute (in grams per mole)
Substituting the given values, we get:
m = 1.90 mol/L × 3.00 L × 40.00 g/mol
m = 228 g.
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24. A hypothesis cannot be considered a
a. possible explanation,
b. preliminary conclusion.
c. good guess.
d. concept
Answer:
B. Preliminary conclusion
Explanation:
The answer is B because a hypothesis is really an educated guess you make in regards to a question, usually before performing an experiment, so it can't be a preliminary conclusion because you don't really have any solid evidence to support your hypothesis, you only have background information. You will either be able/not be able to support your hypothesis after your expirement has concluded.
Explain how original mass of dry ice compares with the mass of carbon dioxide gas?
Can someone pls help me I appreciate it
Answer:
b, e, f
Explanation:
A coyote and an oak tree both reproduce ?
Answer:
YESExplanation:
Coyotes and oak trees are multicellular organisms and multicellular organisms reproduce asexually and sexually.
Many multicellular lower plants give off asexual spores, either aerial or motile and aquatic (zoospores), which may be uninucleate or multinucleate.
Calculate the following using the correct significant digits: 12.354 + 17.5?
Answer:
29.854
Explanation:
12+17=29
.354+.5= 854
what is the molecular formula of Alkyne?
Answer:
CnH2n-2 where n is the number of carbon atoms
Explanation:
for example :
pentayne
C5 H (5x2 -2 )
C5H8
Say the Tuna is removed from the ocean food web, how would it affect other organisms in the food web?
Answer:
removing a top predator may cause its prey to become more abundant, as fewer individuals are eaten. But with more prey around, the organisms that it eats may become scarcer. Seemingly simple changes can have complex effects, with direct and indirect interactions rippling throughout entire ecosystems.
Explanation:
The mere exposure effect _____.
A.happens when familiar things are selectively ignored
B.causes people to dislike things they are familiar with
C.can cause people to reject unfamiliar things
D.is a bias against familiar things
Answer: A
Happens when familiar things are selectively ignored.
Atoms of different
can be distinguished from
each other by the number of protons (atomic number) in their
nucleus.
Answer:
Elements
Explanation:
An element is defined by the number of protons in its nucleus.
For groups 13 through 18, the number of valence electrons is equal to the group number?
plus 1
plus the period number
minus the period number
minus 10
Answer:
22
Explanation:
There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. Therefore, the correct option is option D.
What is periodic table?Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.
Periodic table help a scientist to know what are the different types of elements are present in periodic table so that they can discover the new elements that are not being discovered yet. For groups 13 through 18, the number of valence electrons is equal to the group number minus 10.
Therefore, the correct option is option D.
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4. What are some reasonable safety precautions for field investigations? (1 poi
O None; there are no hazards in the field.
O Always wear goggles and aprons.
O Be prepared and use common sense.
O Always go into the field alone.
The correct answer is Be prepared and use common sense
Explanation:
Field investigations involve studying a phenomenon in a natural environment or setting. For example, the habits of spiders can be studied through field investigation by observing the behavior of spiders in their habitat. This is the opposite of laboratory investigations.
Moreover, as any other investigation, safety precautions are needed to avoid any hazard, and because field investigations can occur in any natural setting and can be related to different hazards, the key rule is to be prepared to work in a specific environment, for example, if the setting is the ocean special suits are required to get in the water and most importantly use common sense about safety.
An electron has a mass
HELP THIS HAS TO BE TURNED IN IN AN HOUR
Answer:
B
Explanation:
Is pure Iron a pure substance or mixture
Answer:
Pure iron is a pure substance.
Explanation:
Pure iron is a pure substance because it's chemical composition stays uniform regardless of it's sample size. It's matter that appears uniform in appearance and composition, no matter how small the sample size. An example of a pure substance includes pure iron
What is the mass of a 15mL sample of mercury? (Density of mercury is: 13.55 g/cm3) (show your work)
Answer:
The answer is
203.25 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume of mercury = 15 mL
density = 13.55 g/cm³
The mass is
mass = 13.55 × 15
We have the final answer as
203.25 gHope this helps you
A patient’s blood sample is 8.5mL, and 3 drops of a chemical are added to test the solution. Each drop is 0.05mL. What is the final volume of the solution
Answer:
4tbs
Explanation:
A 75-lb dog must be dewormed. If the daily dose of the dewormer is 1 tsp/25 lb of body weight for 3 days, approximately how much should be given each day?
1 tbs = 3 tsp
answer: 1 tbs
Can anybody can solve this PLEASE
Answer:
B has highest stability
Explanation:
as its octet is complete
plz mark brainliest if it helps
Which statement describes a property that is unique to metalloids?
Metalloids are shiny.
Metalloids are semiconductive.
O Metalloids are solid.
O Metalloids are brittle.
The statement that described a property that is unique to metalloids would be that they are semiconductive.
Generally, semiconductors are material that at equilibrium between the conductive nature of conductors and non-conductive nature of insulators. In other words, semiconductors are not as conductive as conductors neither are they total insulators.
Semiconductivity is a property that is unique to metalloids because their electrons are more strongly bound to the nucleus of their atoms than those of metals.
Shiny, solid, and brittleness are properties that are shared among a wide variety of materials but semiconductivity is a property that is unique to metalloids.
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Answer: Bbbbb
Explanation:
Which of the following describes what a scientist does?
Answer:
people who discover new things fyi you dont have any answer choices on there
Explanation:
there are different type of scientist
Answer:
A scientist asks questions about the world.
Explanation:
why do neutral atoms lose or gain electron?
Answer: Atoms that lose electrons acquire a positive charge as a result because they are left with fewer negatively charged electrons to balance the positive charges of the protons in the nucleus. Positively charged ions are called cations.
Atoms are made up of subatomic particles and gain or lose electrons to achieve the full electronic configuration and its octet.
What is an atom?The particle of matter has been constituted of at least a proton termed an atom. The electrons in orbitals and the protons and neutrons organized in a nucleus make up the main components of an atom.
Cations are the name given to ions that donate their electron. While anions are atoms that get extra electrons from other species. Seventeen protons and seventeen electrons make up a neutral chlorine atom. The octet needs one electron to be complete. Chlorine has the electrical configurations 2, 8, and 7, and will remain stable if it accepts an electron from a cation.
Therefore, atoms frequently absorb and lose electrons to maintain stability.
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How many protons are in the following atom?
Answer:
This is Lithium and Lithium had 3 protons
Explanation:
Note:The number that is red (3) is the proton number.
The top left number(7) is the nucleon number.
If the question ask the electron number.. It's also 3 because PROTON AND ELECTRON ARE THE SAME
Hope this is correct and helpful
HAVE A GOOD DAY!
A freighter ship carrying a cargo of uranium hexafluoride sank in the English Channel in late August 1984. The cargo of uranium hexafluoride weighed 7.51 x 104 kg and contained 1.47 x 106 L of UF6. What is the density, in g/mL, of uranium hexafluoride?
Your
a) 0.0511 g/mL
b)1.53 g/mL
c)5.11 g/mL
d)2.25 g/mL
e)0.196 g/mL
Answer: A.) 0.0511 g/mL
Explanation:
Given the following :
Mass of uranium hexafluoride = 7.51 x 10⁴kg
Volume of uranium hexafluoride = 1.47 x 10^6 L
Density of uranium hexafluoride in g/mL
Mass in g = (7.51 x 10⁴) * 1000 = 7.51 × 10^7
Volume in mL :
1 L = 1000 mL
1.47 x 10^6L = (1.47 x 10^6)×1000 = 1.47 x 10^9 mL
Density = mass / volume
Density = 7.51 × 10^7 g / 1.47 x 10^9 mL
Density = 5.1088435 × 10^7-9
Density = 5.1088435 × 10^-2 g/mL
= 0.0510884
Density = 0.0511 g/mL
*BRAINLEST* is nitrogen gas an element, compound, homogenous mixture, or a heterogeneous mixture? :)))
Answer:
Nitrogen gas is a homogenous mixture!
Neither a compound nor a combination, nitrogen gas ([tex]\rm N_2[/tex]) is neither. It is an element.
A pure material made up of just one kind of atom is called an element. When it comes to nitrogen gas, two nitrogen atoms are chemically linked together to form diatomic nitrogen molecules. A compound, on the other hand, is a substance that is created through the chemical fusion of two or more elements in a predetermined ratio. Since there is no chemical link between any other elements and the nitrogen atoms that make up nitrogen gas ([tex]\rm N_2[/tex]), it is not a complex.
It is crucial to remember that mixes entail the blending of several chemicals, regardless of whether nitrogen gas is homogenous or heterogeneous. Nitrogen gas, on the other hand, is not a mixture either. It is made entirely of identical nitrogen molecules and is a pure material.
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