Answer:
why is most space exploration accomplished with spacecraft that do not have crews on board? humans face many challenges in space. what is one advantage of using an orbiter to study objects in space? can be used for long periods of time.
Give the names for the following compounds:
a. Ag2O
b. Ca(OH)2
c. KClO3
d. NH4Cl
e. Fe2(CrO4)3
f. KClO
Answer:
b. CA(OH)2 - Calcium hydroxide
is ironing clothes conduction, convection or radiation
Ironing clothes is Conduction.
What is Conduction?Conduction is one of the means of Heat transfer ,others includes
Convection RadiationConduction is the transfer of heat energy from one object to another object from particles in a hotter object to particles in a cooler object, For Example: Ironing clothes is conduction.
This is because The heat from the iron which transfers to the clothes is conduction.
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Which uses more energy?
Question 1 options:
Washing machine
Dryer
Answer:
What's surprising, however, is that a washing machine requires way less electricity than a dryer. An average cycle for a washing machine is 30 minutes. This appliance, which is a widely used Energy Star model, needs 500 watts per hour to run, which means it requires 250 Wh, or 2.25 kWh, to run for 30 minutes.
Answer:
[tex]I'm~here~to~help![/tex]
The correct option is B. Dryer, because a washing machine uses 1,200 or 3,000 watts on average, while a dryer uses 1,800 or 5,000 watts. That is a lot of watts!
how many units of NaOH are in 80 grams of NaOH
Answer:
0.17637 pounds
Explanation:
hope this help
The number of units of NaOH are in 80 grams is 12.046 x 10²³ Particles of NaOH.
What is Mole concept ?The mole, symbol mol, is the SI base unit of amount of substance.
The quantity amount of substance is a measure of how many elementary entities of a given substance are in an object or sample.
Formula to calculate number of Particles when weight of the sample is given ;
N = given weight / Molecular weight x Nₐ
= 80 / 40 x 6.023 x 10²³ Particles
= 12.046 x 10²³ Particles of NaOH
Hence, The number of units of NaOH are in 80 grams is 12.046 x 10²³ Particles of NaOH.
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Ivana is studying insect life cycles. She placed a male and a female gnat inside a terrarium. The female gnat laid eggs. Ivana observed and recorded all of the stages she saw the eggs go through. Her results are shown in the table below.
Answer:
B. A gnat completes its life cycle in about 1 month.
Explanation:
Stage Time in Stage
egg 24 hours
larva 7 days
pupa 6 days
adult 2 weeks
Which of the following is a valid conclusion that Ivana can draw from her data?
A. Agnat generally does not live for more than 1 week.
B. Agnat completes its life cycle in about 1 month.
C. Agnat life cycle has more than five stages.
D. Agnat is a crustacean, not an insect.
What is the oxidation number of each element in PbO2
Answer:
+4
Explanation:
In PbO
2
, oxygen exhibits an oxidation number of −2 (since it's not a peroxide or superoxide).
Let the oxidation number of Pb be x. Then, for the compound to be neutral, the oxidation numbers of all atoms should add up to zero.
⇒x+(−2)+(−2)=0
x=+4
So the oxidation no. of Pb is +4.
The lead (Pb) oxidation number in [tex]\rm PbO_2[/tex] is +4, whereas the oxygen (O) oxidation number is -2.
The idea of oxidation number, also known as oxidation state, is used in chemistry to describe the potential charge that an atom would have if electrons were completely transported in a chemical bond or reaction. It is a valuable instrument for tracking electron distribution in a chemical or ion and understanding redox (oxidation-reduction) reactions. Understanding redox processes, which involve the transfer of electrons between reactants, requires an understanding of oxidation numbers.
Oxidation number of Pb is given as:
(+x) + 2(-2) = 0
x - 4 = 0
x = +4
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me need help...................!!!!!!!!!!!
Answer:
Explanation:
As the distance to the outermost electron of the Group 1 element increases, the amount of energy required to remove an electron decreases.
That's D
A: and C: are both incorrect for the same reason. Group 1 elements don't add electrons -- they try and give those electrons away.
B: all of the group one have only 1 valence electron,
please help
Which of the following diagrams shows how osmosis would affect a plant cell when placed in a solution with a lower solute concentration than its own?
A.
Diagram Y
B.
Osmosis is not dependent on solute concentration.
C.
Diagram Z
D.
Diagram X
Answer:
Diagram Z
Explanation:
A cell placed into a hypotonic solution will swell and expand until it eventually burst through a process known as cytolysis.
Answer:
Diagram Y
Explanation:
Osmosis is the passive movement of water molecules across (into or out of) a cell membrane. "Passive" means that the process occurs automatically without the need for chemical energy.
In the diagrams above, a plant cell is shown as it would appear in a solution with a solute concentration more than its own (X), a solution with a solute concentration equal to its own (Y), and a solution with a solute concentration less than it own (Z). The movement of water is toward the area of more solute concentration (and therefore less water concentration).
The answer, then, is Diagram Y.
(Trust me, I just did it)
Convert 7.6 × 105 cal to kiloJoules
help! this is science, Palmas is closer to the equator than Neuquén. Which location has a warmer air temperature and why?
Answer:
Palmas, because more energy is transferred from the sun directly to the surface and then from the surface to the air.
Explanation:
Hope this helps:)....if not then sorry for wasting your time and may God bless you:)
In terms of drug development, rank the following microbes from most difficult (1) to least difficult (3):
Answer:
See below ↓↓↓
Explanation:
Helminths = 1 Most Difficult
Fungi = 2 Moderately Difficult [Option not given, but 2 is right answer]
Bacteria = 3 Least Difficult
Qi/ a cargo ship travels at an average speed of 20m/s. how long will it take to travel between two
ports which are 1000km apart?
Answer:
50000 seconds
Explanation:
Classic dimensional analysis question!
[tex]\frac{1000\text{km}}{20\text{m/s}} * \frac{1000\text{m}}{1\text{km}}=50000\text{s}[/tex]
PLS HURRRRRRRRYYYY!!!!
Research a type of plant tropism not presented in the lessons. Create a meme below that name and describes the tropism.
In an ecosystem, plant tropism represented is phototropism which is towards the direction of light.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
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How many nickel atoms are contained in a 92.02 mole sample
Answer:
By definition, and this is what Avogadro's constant tells you, 1 mole of nickel must contain 6.022⋅1023 atoms of nickel.
Explanation:
4Al + 3O2 --> 2Al2O3 coefficients
Answer:
coefficients: 4, 3, 2
Explanation:
Which is the goal of technology?
to expand comprehension
to make life easier
to apply knowledge
to improve communication
Answer:
B. To make life easier.
Explanation:
Although all of the above makes sense, the answer should be B. because it is to help improve how we live.
I hope it helps! Have a great day!
Muffin~
The goal of technology is to make life easier.
What is goal?A goal is "an idea of the future or desired result that a person or a group of people envision, plan and commit to achieve".
What is technology?
Technology is "the use of scientific knowledge for practical purposes or applications, whether in industry or in our everyday lives".
Hence, the goal of technology is to make our life better.
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Calculate: Describe the RGB value and color you would obtain with each combination described below. Use the Gizmo to check your answers.
RGB value Color
Yellow (255, 255, 0) and blue (0, 0, 255) ______________ ______________
Plum (120, 0, 120) and dark green (0, 120, 0) ______________ ______________
Teal (0, 90, 90) and bronze (185, 150, 0) ______________ ______________
In the RGB color model, each color is represented by a numerical code that is written in parentheses and separated by commas.
What is the RGB model?RGB is a color model with which it is possible to represent a color by mixing by adding the three primary colors of light.
A special feature of this model is that it is not a reference point for defining the color red, green, or blue because the same RGB values can display noticeably different colors on different devices.
To form a color, it must be taken into account that in the RGB model the incidence of each color (red, green or blue) is measured on a scale that goes from 0 to 255.
These values are represented in parentheses, separated by commas as shown in the image below:
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1a. Review What holds the hydrogen and oxygen
atoms together in a water molecule?
Please help solve this I’ll award brainliesttt
Answer:
types of elements nacl MGS
behavior shared between atoms tranferred from one to another
properties high melting poin low melting point
example SI-o metal + non metal
example H-H only non metal elements
Explanation:
A diverâs backup oxygen tank reads 900 mm Hg while on her boat, where the temperature is 27 degrees C. When she dives down to the bottom of an unexplored methane lake on a recently discovered moon of Neptune, the temperature will drop to -183 degrees C. What will the pressure in her backup tank be at that temperature?
Taking into account the Gay Lussac's law, the pressure in the backup tank at -183 °C is 270 mmHg.
Gay Lussac's lawGay Lussac's law establishes the relationship between the temperature and pressure of a gas when the volume is constant.
This law says that the pressure of the gas is directly proportional to its temperature: when there is a constant volume, as the temperature increases, the pressure of the gas increases. And when the temperature is decreased, gas pressure decreases.
Mathematically, Gay-Lussac's law states that the ratio between pressure and temperature has the same value:
[tex]\frac{P}{T} =k[/tex]
Studying an initial state 1 and a final state 2, it is fulfilled:
[tex]\frac{P1}{T1} =\frac{P2}{T2}[/tex]
Pressure in the backup tankIn this case, you know:
P1= 900 mmHgT1= 27 C= 300 K (being 0C= 273 K)P2= ?T2= -183 C= 90 KReplacing in the Gay-Lussac's law:
[tex]\frac{900 mH}{300 K} =\frac{P2}{90 K}[/tex]
Solving:
[tex]P2=90K\frac{900 mH}{300 K}[/tex]
P2=270 mmHg
Finally, the pressure in the backup tank at -183 °C is 270 mmHg.
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A 6.39L balloon filled with gas is warmed from 239.3K to 305.9K. What is the volume of the gas after it is heated?
Answer:
69.271837183727718371
Can someone please help me?? :(
Answer:
A and B is the answer
Answer:
option b
Explanation:
state 3 commercial uses of oxygen
Answer:
Brainliest Please !!!!!
The buffer that is adjusted to control acid-base balance is ________. plasma protein hemoglobin phosphate buffer bicarbonate: carbonic acid buffer
The buffer that is adjusted to control acid-base balance is referred to as a bicarbonate buffer.
What is a Buffer?This consists of a weak acid and its conjugate base, or vice versa and resist changes in the pH of the solution.
The bicarbonate buffer is involved in acid-base homeostasis by removing CO2 and hydrogen ions, respectively, from the body.
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62. Write formulas for the following substances and
designate their physical states.
a. nitrogen dioxide gas
b. liquid gallium
c. barium chloride dissolved in water
d. solid ammonium carbonate
The formulas for the substances and designate their physical states as follows:
a. nitrogen dioxide gas NO₂(g)
b. liquid gallium GA (I)
c. barium chloride dissolved in water BaCI₂ (aq)
d. solid ammonium carbonate (NH₄) 2CO₃ (s)
What is chemical formula ?The term chemical formula is defined as an expression that presents the elements in a compound and the relative proportions of those elements.
If only one atom of a particular type is present, no subscript is used. For atoms that have two or more of a particular type of atom present, a subscript is written after the symbol for that atom.
It presents the constituent element and the number of atoms of each element present in one molecule of the compound. It also corresponds to the molecular mass of the compound.
Thus, The formula of nitrogen dioxide gas is NO₂(g).
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what are the products for the following equation?
NaCl + H2O ->
Answer:
NaOH + HCI
Explanation:
yesssssssssssss
A film crew is setting up a scene to show the effects of a blast wave on nearby cars. Why do you think the cars are hanging from cables?
The cars are hanging from cables so that there is presence of more medium of propagation to make it look real.
What is a Blast wave?This is referred to as a violent propagating disturbance, produced by an explosion in air.
Hanging the cars in the air will ensure an accurate description of the effect of the blast wave on them.
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Choose the general equation for a decomposition reaction.
Answer:
A decompositon reaction is a reaction that takes place when one reactant breaks down into two or more simpler substances. The decomposition reaction can be represented by the general equation: AB → A + B. Most of the decomposition reactions require an input of energy in the form of heat, light or electricity
Explanation:
what is the purpose of the lab ? PLSSS HELPPPPP
Answer:
To keep apparatus, chemicals and carry out experiments
Why is the magnitude of the electron affinity for a given element smaller than the magnitude of the first ionization g