Answer:
Homozygous dominant
Explanation:
The balloon in this image was rubbed with a piece of wool material. Now, it is negatively charged. What force allows the charged balloon to "pick up" the small pieces of paper off of the table?
The negatively charged balloon is attracted to negative static charges in the paper..
The negatively charged balloon is attracted to the north pole of the paper pieces.
The negatively charged balloon is attracted to the south pole of the paper pieces.
The negatively charged balloon is attracted to the positive static charges in the paper.
What is the best explanation of electric current in a wire?
Electrons build up in the wire and create a charge.
Electrons flow because of electrical attraction and repulsion.
Protons are pushed along by electric forces.
Atoms move because of heat.
Why does the light bulb in a circuit turn on when you close the switch?
The switch absorbs the electrical energy.
The switch changes the direction of the flow of electrons.
Closing the switch completes the circuit, making it a closed circuit.
The switch changes the circuit from series to parallel.
Earth is dipolar, like a bar magnet.
What does this mean about its magnetic poles?
There is only a magnetic south pole.
There is only a magnetic north pole.
There are both magnetic north and south poles.
There are two magnetic north poles.
Which arrangement described below would result in magnetic poles that attract one another?
North Pole + South Pole
South Pole + West Pole
East Pole + North Pole
North Pole + North Pole
Why is an electromagnet a temporary magnet?
An electromagnet only attracts other permanent magnets.
An electromagnet becomes a magnet when a current flows through the wire. An electromagnet no longer acts as a magnet when the current flow stops.
An electromagnet cannot be turned on and off.
An electromagnet is a magnet when no current flows through the wire. The electromagnet no longer acts as a magnet when current flows through the wire.
What set of materials listed below could be used to create a complete electromagnet?
wires and battery
iron nail and battery
iron nail, magnet, and wire
battery, iron nail, copper wire
Where is a bar magnet's magnetic field the strongest?
red part of the magnet
longest part of the magnet
magnetic poles (N + S)
center of the magnet
A(n) ___________ is represented in the diagram it converts electrical energy into mechanical motion.
generator
electromagnet
parallel circuit
motor
Answer:
I actually have no idea
Explanation:
Sorry my man
Answer:
Explanation:
generator
Which has the highest rate of effusion oxygen or hydrogen
Answer:
Hydrogen has the highest rate of effusion
The ___________________ is an early theory which states that our solar system was formed by the gravitational collapse of a massive giant cloud.
A) Nebular Theory
B) Capture Theory
C) Proto-planet Theory
D) Schmidt-Lyttleton accretion theory
Answer: A) Nebular Theory
Explanation:
Answer:
A)
Explanation:
(Multiple Choice, 30 pts)
A student wants to determine whether an unknown solid is an ionic compound. He puts some in water and finds that it does not dissolve. He says that this proves the solid is ionic. Which best evaluates the student's reasoning?
A. He is incorrect, because water can dissolve ionic solids.
B. The test proves nothing, because water dissolves all solids.
C. He is correct, because polar liquids cannot dissolve ionic solids.
D. The test proves nothing, because it only shows that the solid is a compound.
(I know water is polar, so I think its a?)
The student cannot prove that if the compound is ionic or covalent because not all ionic compounds dissolves in water. Some ionic compounds have higher lattice energy results in lower solubility. Thus, option D could be correct.
What are ionic compounds?Ionic compounds are formed between metals and non metals. Metals are electron rich and they easily donate electrons to the non-metals. Non-metals are generally electronegative and they easily gains electrons from the metals.
Donating electrons make metals acquire positive charge and the non-metals acquire a negative charge. This charge separation make the compound possess a permanent dipole moment. Which make them easily soluble in water by ion-dipole interaction.
However, some ionic compounds have very strong ionic bonds and their binding energy will be greater so that cannot be easily dissolved in water. For example, AgCl. Therefore, we cannot predict weather the compound is ionic or not by simply noting it solubility in water.
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please help me please
Answer:
b
Explanation:
i read this once and remember,trust me!
Answer:
20 is b and 21 is a.
Discribe how an internal combustion engine works. What is drawback to the type of power?
Answer:
An internal combustion engine is a heat engine in which the combustion of a fuel occurs with an oxidizer in a combustion chamber. The force of combustion is converted into mechanical energy through the use of levers and gears. The by products of combustion include energy, water vapor, carbon dioxide (CO2), nitric oxide (NO), nitrogen dioxide (NO2), and carbon monoxide (CO). The two primary drawbacks to the internal combustion engine are the primary energy source is non-renewable (fossil fuels) and the by products can have damaging effects on the environment.
Explanation:
How is the atmospheric oxygen that is taken in by living things for respiration replaced?
A) After living things use oxygen for respiration, they exhale the oxygen back to the atmosphere.
B) Photosynthesis uses the carbon dioxide that is exhaled by living things to make oxygen.
C) Weathering releases oxygen that is locked in rocks due to sedimentation.
D) Oxygen that is dissolved in water such as oceans is released.
Answer:
B.) Photosynthesis uses the carbon dioxide that is exhaled by living things to make oxygen.
Explanation:
How do American cities now protect their water resources
Answer:
They can use man made materials or they can also have designed areas that people can’t go into
Explanation:
Ca(OH)2
Name this compound according to IUPAC nomenclature.
A) calcium hydroxide
B) calcum oxide hydride
C) calcium (II) hydroxide
D) calcium (II) oxide hydride
Help Chem asap!!!!! Brainslist
Answer:
OH-
Explanation:
Which pair of elements would combine to form an ionic compound?
а
b
sodium and calcium
sodium and chlorine
carbon and oxygen
carbon and sulfur
с
d
sodium and chlorine Because Sodium and chlorine make Salt which are ionic compound.
Explain the effects that different frequencies of electromagnetic radiation have when absorbed by matter.
As the frequency of the radiation increases further, into the visible light spectrum, it can cause electronic transitions in atoms and molecules, leading to the emission of light and other optical effects.
What is electromagnetic radiation?Electromagnetic radiation is a form of energy that travels through space in the form of waves, without the need for a medium to propagate. It is characterized by oscillating electric and magnetic fields that are perpendicular to each other and the direction of propagation.
At low frequencies, such as radio waves and microwaves, the radiation typically only causes heating of the matter, as it transfers energy to the molecules in the material.
At higher frequencies, such as infrared radiation, the radiation can cause vibrations in the atoms and molecules of matter, leading to heating and thermal effects.
Thus, When matter absorbs electromagnetic radiation, the effects that it has on the matter depend on the frequency of the radiation.
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People who live in hot, dry climates often rely on _________________________ for their drinking water
Answer:
People who live in hot, dry climates often rely on desalination plants for their drinking water.
Explanation:
This is your answer.
A neutralization reaction has what two reactants?
A — acid and base
B —- hydrocarbon and water
C— acid and salt
D—hydrocarbon and base
Answer:
it's a, acid and base
Explanation:
a neutralization reaction occurs between strong acids and strong bases and result in the formation of a salt and water
Question 2 options: The Galápagos tortoises are native to seven of the Galápagos Islands, a volcanic archipelago about 620 miles west of the Ecuadorian mainland. With lifespans in the wild of over ____________years, it is one of the longest-lived vertebrates. A captive individual lived at least ______________years!
Answers:
in the wild of over 100 years,...
A captive individual lived at least 255 years!
Explanation:
The giant Galapagos tortoises (Chelonoidis nigra) are famous because this species was observed by Darwin during his travel. This species is native from the Galapagos Islands and currently is in danger of extinction. Galapagos tortoises are recognized as one of the longest vertebrates. In this regard, it is worthy to note that a giant tortoise named Harriet lived 255 years, this specimen was in the Australian Zoo.
in a titration 20.0 mL of 0.150 M NaOH(aq) Solution exactly neutralize is 24.0 mL of an HCl solution what is the concentration of the HCl solution
Answer:
0.125
Explanation:
i took a test and got it right choosing this answer hopes this help
Select the single best answer.
Predict the pH (> 7, < 7, or = 7) of a LiHCO3 solution.
Answer:
LiHCO3 its PH >7
Explanation:
the real ph for it is 11.3 so it makes it more than 7
and if you know it is a conjugate base coming from the weak acid H2CO3 so LiHCO3 is a base
How are renewable fuels different from fossil fuels
Answer:
Renewable energy
Explanation:
on the other hand, typically emits less CO2 than fossil fuels. In fact, renewables like solar and wind power—apart from construction and maintenance—don't emit any CO2 at all. With renewable energy, you can breathe easier, stay cooler, and create a more comfortable world for generations to come.
Answer:
renewable energy comes from natural resources that can be replenished or replaced during an average human lifetime ; eg, Hydro, solar, wind etc.
fossil fuels can take thousands or even millions of years to naturally replenish; eg, natural gas, coal, oil.
The half-life of gold-198 is 2.7 days. After
amount of gold-198 will remain.
days, 1/4 of the original
Answer: 8.1 days
Explanation:
Expression for rate law for first order kinetics is given by:
[tex]t=\frac{2.303}{k}\log\frac{a}{a-x}[/tex]
where,
k = rate constant
t = age of sample
a = let initial amount of the reactant = x
a - x = amount left after decay process= [tex]\frac{x}{4}[/tex]
a) to find rate constant
Half life is the amount of time taken by a radioactive material to decay to half of its original value.
[tex]t_{\frac{1}{2}}=\frac{0.693}{k}[/tex]
[tex]k=\frac{0.693}{2.7days}=0.257days^{-1}[/tex]
b) for completion of one fourth of reaction
[tex]t=\frac{2.303}{k}\log\frac{x}{\frac{x}{4}}[/tex]
[tex]t=\frac{2.303}{0.257}\log{4}[/tex]
[tex]t=8.1days[/tex]
Thus after 8.1 days , one fourth of original amount will remain.
Sulfuric acid (H2SO4) has a molar mass of 98.1 g/mol. How many oxygen atoms are found in 75.0 g of H2SO4? A. 1.15 × 10^23 B. 1.84 × 10^24 C. 4.61 × 10^23 D. 7.87 × 10^23
Answer:
B
Explanation:
first find the no. Of moles of H2SO4
= 75/98.1
= 0.7645
Next step
In on mole of H2SO4 the no.of oxygen atom is 4.
1 H2SO4 : 4 O
0.7645 : x x= 0.7645x4= 3.0581
next multiply avogadros constant
3.0581 x 6.022× 10^23 =1.84x10^24
Mass present in 1 gram of mole substance is called molar mass. Molar mass is calculated by: dividing the mass of the compound in grams by the number of moles present in the substances.
The correct answer is:
option B. 1.84 × 10²⁴
Given,
The mass of sulfuric acid =75.0 gThe molar mass of sulfuric acid = 98.1 g/mol
1.The moles of sulfuric acid can be calculated by
M = m ÷ n
where M is molar mass, m is mass and n moles.
moles of sulfuric acid = mass ÷ molar mass
= 75 g ÷ 98.1 g/mol
=0.7645 moles
Hence moles of sulfuric acid present is 0.7645 moles.
2. 1 mole of sulfuric acid = 4 oxygen atoms.
Then, 0.7645 moles of sulfuric will contain: 0.7645 × 4 = 3.0581 atoms of oxygen
3. Oxygen atoms present in 75.0 g of H₂SO₄ will be calculated by multiplying it with Avogadro's constant:
= 3.0581 x 6.022× 10²³
= 1.84x10²⁴
Therefore, 1.84 × 10²⁴ oxygen atoms will be found in 75.0 g of H₂SO₄.
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Ms. Clark is teaching her class about how plants make food for themselves. On the board, she has written this: __________ + air + water = food for plants
Answer:
sunlight
Explanation:
help me name these molecules please
Answer:
1. carboxylic acid
2. ether
3. ester
4. aldehyde
5. ketone
6. amine
7. alcohol
Explanation:
Know the functional groups. If you would like to learn them, let me know.
- Hope that helps! Please let me know if you need further explanation.
PLS HELP
In the balanced equation:
H3PO4(aq) + NH3(aq) ↔ X(aq) + NH4+(aq)
The particle represented by X(aq) is
A) H2PO4–(aq)
B) HPO42–(aq)
C) PO43–(aq)
D) H3PO4(aq)
Answer:
The particle represented by X(aq) is A) H₂PO₄⁻(aq)
Explanation:
According to the Brønsted-Lowry Theory, a base is a substance capable of accepting protons (H⁺) in solution. Conversely, a substance acts as an acid if it acts as a proton donor.
A proton transfer then occurs, requiring the presence of a proton donor (an acid) and a base that accepts them.
When an acid gives up a proton, it becomes an anion, generating a conjugate base. That is, a conjugate base is an ion or molecule resulting from the acid that loses the proton. Conversely, a conjugated acid is an ion or molecule resulting from the base that the proton gains.
In this NH₃ / NH₄⁺ pair that NH₄⁺ is the conjugate acid of the NH₃ base, the latter acting as a base since it accepts a proton. H₃PO₄ then acts as an acid, yielding a proton and generating the conjugate base H₂PO₄⁻.
So, the particle represented by X(aq) is A) H₂PO₄⁻(aq)
what is the compound of libr
Answer:
Lithium Bromide
Explanation:
Answer:
El bromuro de litio es un compuesto químico de litio y bromo. Su carácter higroscópico extremo hace que LiBr sea útil como desecante en ciertos sistemas de aire acondicionado.
Explanation:
HELP CHEM ASAP!!!!!!
Answer:
0.132
Explanation:
is the only part i know
10) Intravenous saline solutions have a concentration of 1.5 M NaCl. How many liters of saline can be prepared from 50.0 g of NaCl?
Answer:
0.57 mol/L
Explanation:
Molarity (M) is defined as the number of moles of solute per liter of solution (moles/Liter).
Molarity = [tex]\frac{moles of solute}{liters of solution}[/tex] or Moles = molarity × litres
so, the mass of Nacl in 1 mol is 58.44 g,
Moles of NaCl = 50.0g x 1 mole NaCl / 58.44 g
= 0.855 mol NaCl
Moles = molarity × litres
0.855 = 1.5 M x L
L = 0.57 mol/L
Hence, 0.57 mol/L can be prepared from 50.0 g of NaCl.
Identify three details for how the Earth and Moon are different
What’s the two products of H2Co3
Answer:
Hydrogen and Cobalt
Explanation:
Break up each individual element
- Hope that helps! Please let me know if you need further explanation.
I’ll give Brainliest to the first answer
The amount of elements on the reactants side of an isolated equation are ___________ the amount of __________ that are formed on the ________ side. *
A)close to, ice crystals, cold
B)less than, properties, chemical
C)equal to, elements, products
D)similar, molecules, present
E)more than, elements, products
Answer:
C. equal to, elements, products
Explanation:
I took a quiz and it said this was right
The map shows the main streams and the the rivers near City A and City B, as well as the nearby factories and farmland, The arrows in
the diagram show the direction of the water flow. City A gets its water from the sunset River and City B gets its water from the Moth Lake. A liquid herbicide was applied to a farmland. What is the greatest risk of using the herbicide?
Select One:
It will pollute the water source for the city A
It will pollute the air for the City B
It will pollute the water source of city B
It will pollute the air for the city A
Answer:
c
Explanation:
the map shows water near the factories go into moth lake so all of the waist will end up there
