Answer:
bc the water molecules freeze
Determine the mass of the negative electrode at the start of the experiment use figure 3
please help , i’m doing a test and i’m really bad at science , lol , thank you !
it cannot be passed to the next generation meaning A chromosome will be eliminated
PLS HELP ASAP IM MARKING BRAINLIEST. This is science
Answer:
Random
Explanation:
Materials have numerous domains. Domains have a north and south side. In magnetic metals, all of the domains are pointed in the same direction. This creates an overall magnetic field that gives the material its magnetic property.
On the other hand, non-magnetic materials still have domains but they don't face the same direction. Instead, they are randomly directed. This means that the material cannot have the same magnetic properties that ferromagnetic materials have.
What happens when a chemical hand warmer is unwrapped and starts to work?
A. A physical change absorbs thermal energy.
B. A chemical reaction absorbs thermal energy.
C. A physical change releases thermal energy.
D. A chemical reaction releases thermal energy.
Answer: D. A chemical reaction releases thermal energy.
Explanation:
Hope this helps! <3 :)
Which sentence explains why gases can change volume but liquids cannot?
A. Gravity affects liquid atoms more than gas atoms.
B. The forces holding atoms together are stronger in a liquid than in
a gas.
O c. The forces holding a liquid together are more flexible than those in
a gas.
D. Liquid atoms are more like solid atoms than gas atoms.
Answer:
B. The forces holding atoms together are stronger in a liquid than in
a gas
I hope that this helps!
Which substance is a heterogeneous mixture
Answer:
Is there any options?
Explanation:
Please help brainiest is award.
Answer:
2 i think if not than its 4
Explanation:
Answer:
3 if its not than 4
Explanation:
Plz solve anyone...........................
Answer:
no (units don't cancel each other out)
yes (convert both to same unit and multiply)
yes (multiply)
Explanation:
Importance of iron metals ions in biological System
Answer:
Metal ions are fundamental elements for the maintenance of the lifespan of plants, animals and humans. Their substantial role in biological systems was recognized a long time ago. They are essential for the maintenance of life and their absence can cause growth disorders, severe malfunction, carcinogenesis or death
Explanation:
:)
help me match the cards because there is a lot ill add more points please and thank you
Answer:
thats alot and makes no since
A ball moving at a 7.0 m/s has a momentum of 98 kg•m/s. What is the ball's mass?
Answer:
Explanation:
Momentum has the formula of kg m/s and is represented by m*v
Formula
momentum= mv
Givens
m =??
v = 7 m/s
mv = 98 kg m/s
Solution
98 = 7 * m
98/7 = m
m = 14 kg
Chemistry is the branch of science which make physis and biology clear true or false
Answer:
yes it is branch science make physics and biology in physics make therom and biology make defination
A pile of feathers has a mass of 57 g and a volume of 300 mL. Calculate the density.
Find the density of a brick that has a mass of 57 g and a volume of 12 mL.
A sample has a mass of 15 g and a volume of 3 mL. Calculate the density.
[tex]density = \frac{mass}{volume} [/tex]
1. density = 57/300
= 0.19 g/ml
2. density = 57/12
= 4.75 g/ml
3. density = 15/3
= 5.0 g/ml
please help !!!!!!!!!!!!!!!!
Answer:
covalen and ionic compound
how many significant figures does 0.00003 have?
the neutralization reaction gets its name from.the fact that the products of the reaction are
Answer:
Neutral
Explanation:
Neutralization reaction gets its name from the fact that the products of the reaction are _____.
neutral
i need help with number 1 :/ please help me, thank you
Answer:
Amplitude is measured from the center line to the highest point in the waves.
Wavelength is the distance between one wave to the other from the highest point.
Frequency is the rate of the waves.
balancing chemical equations
What is one key physical difference between transition
metals and poor metals?
А.Atomic mass
B.Hardness
C.Reactivity
D.Charge
PLEASE HELP ME!!
Write formulas for the following compounds:
a. lithium fluoride, lithium chloride, lithium bromide, lithium iodide, lithium oxide, lithium sulfide
b. sodium fluoride, sodium chloride, sodium bromide, sodium iodide, sodium oxide, sodium sulfide
c. potassium fluoride, potassium chloride, potassium bromide, potassium iodide, potassium oxide, potassium sulfide
d. ammonium fluoride, ammonium chloride, ammonium bromide, ammonium iodide, ammonium sulfide
Answer:
a).lithium fluoride => LiF
lithium chloride =>LiCl
lithium bromide => LiBr
lithium iodide => Lil
lithium oxide =>Li₂O
lithium sulfide => Li₂
b).sodium fluoride => NaF
sodium chloride => NaCl
sodium bromide => NaBr
sodium iodide => Nal
sodium oxide => Na₂O
sodium sulfide => Na₂S
c).potassium fluoride => KF
potassium chloride => KCl
potassium bromide => KBr
potassium iodide => KI
potassium oxide => K₂O
potassium sulfide => K₂S
d).ammonium fluoride =>NH₄F
ammonium chloride => NH₄Cl
ammonium bromide => NH₄Br
ammonium iodide => NH₄I
ammonium sulfide => (NH₄)₂S
What is the formula unit for a compound made from Pb4+ and oxygen? (3 points)
PbO2
O2Pb
Pb4O2
O4Pb2
The formula unit of compound made up from Pb4+ and oxygen is PbO2.
The formula unit for a compound made from Pb⁴⁺ and oxygen is PbO₂. Therefore, option (1) is correct.
What is the formula unit?A formula unit represents the lowest whole number ratio of ions in an ionic compound. The formula mass of a substance is the sum of the atomic masses of the ions present in the formula unit of an ionic compound.
Formula unit is the empirical formula of any covalent or ionic solid compound which is used as an independent entity for stoichiometric calculations. Formula mass is also defined as the sum of atomic masses of constituent atoms in an ionic compound.
A molecule is made up of two or more elements that are covalently bonded. Also, the molecular mass gives the mass of a molecule relative to that of a carbon twelve atom which has a mass of twelve units.
As we know the valency of lead is 4 and the valency of oxygen is 2. To satisfy the valency of each other two oxygen combine with one lead (IV). Therefore, the formula unit of the compound is PbO₂.
Learn more about formula unit, here:
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transition elements have variable valency why
Answer:
The transition elements have their valence electrons in two different sets of orbitals that are (n-1)d and ns. Thus, transition elements show variable valencies due to the involvement of penultimate d shell electrons.
Explanation:
What is the cause of rejection of classical concept of oxidation and reduction reaction?
Answer:
Oxidation is the loss of electrons or an increase in the oxidation state of an atom, an ion, or of certain atoms in a molecule. Reduction is the gain of electrons or a decrease in the oxidation state of an atom, an ion, or of certain atoms in a molecule.
Explanation:
To solve such this we must know the concept of redox reaction. Therefore, The cause of rejection of classical concept of oxidation and reduction reaction is in any process, oxidation can occur only if reduction is also taking place side by side and vice versa.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
Oxidation and reduction reaction involves gain of electron and loss of electron simultaneously. This type of reaction is called redox reaction. The cause of rejection of classical concept of oxidation and reduction reaction is in any process, oxidation can occur only if reduction is also taking place side by side and vice versa.
Therefore, the cause of rejection of classical concept of oxidation and reduction reaction is in any process, oxidation can occur only if reduction is also taking place side by side and vice versa.
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Rank lead, phosphorus, and barium in order of increasing ionization energy.
Answer:
D) Ba < Pb < P
Explanation:
Barium (Ba): 5,2117
Lead (Pb): 7,4167
Phosphorus (P): 10,4867
Can somebody list only 2 ways whales are different from fish?
(Make it only like 1 sentence)
(WILL MARK BRAINLIEST)
:D
Answer:
1. whales are mammals and fish are not
2. Fish have gills which extract oxygen from the water and thus allow it to live underwater its entire life. Whales on the other hand do not have gills but instead have one or two blowholes
3. whales provide milk to their young and fish do not!
Explanation:
What is potential energy?
Answer:
Potential energyPotential energy is the energy possessed by an object because of its position with respect to a reference.
Explanation:
The energy obtained because of its location or position is called potential energy.
》Example:
Water in a dam stores potential energy because of its height.
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°• Answer By Yoland •°
Consider the reaction below. upper c upper c l subscript 5 (g) double-headed arrow upper p upper c l subscript 3 (g) plus upper c l subscript 2 (g). at 500 k, the reaction is at equilibrium with the following concentrations. [pci5]= 0.0095 m [pci3] = 0.020 [ci2] = 0.020 m what is the equilibrium constant for the given reaction? 0.042 0.42 2.4 24
The equilibrium constant for the given reaction is 0.0421.
What is equilibrium constant?Equilibrium constant of any reaction is define as the ration of the product of concentration of products to the product of the concentration of reactants, with raise to the respective coefficients.
Given chemical reaction is:
PCl₅ → PCl₃ + Cl₂
The equilibrium constant's for this reaction is:
Kc = [PCl₃] [Cl₂] / [PCl₅], where
Concentration of [PCl₃] = 0.020M
Concentration of [Cl₂] = 0.020M
Concentration of [PCl₅] = 0.0095M
Putting all these values in the above equation we get,
Kc = (0.02 x 0.02) / 0.0095 = 0.0421
Hence, 0.0421 is the equilibrium constant.
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Answer:
A on edg
Explanation:
im doin it rn
2. What element is steel mainly
composed of?
A Iron
B. Carbon
C. Manganese
D. Silver
Answer:
Carbon
Explanation:
Steel is an alloy of iron and carbon. Stainless steels are steels containing at least 10.5% chromium, less than 1.2% carbon and other alloying elements
Answer: B
Explanation:Steel is an alloy of iron and carbon.
Which of the following are NOT SAFE things to do, as we might get an electric shock?
1) Touching the switch of a geyser with dry hand.
2) Standing on a wooden stool to check a plug point.
3) Poking a metal rod into an electrical socket.
4) Touching the water in which an immersion heater is kept.
What will a cathode ray do if a positive electrode is placed near the beam?
Answer:
The function of the cathode ray tube is to convert an electrical signal into a visual display. Cathode rays or streams of electron particles are quite easy to produce, electrons orbit every atom and move from atom to atom as an electric current.