Plastic or rubber as non metal are bad conductor of electricity.
What is the relationship between the circulatory and respiratory systems?
A. They work together to store the waste that blood collects from the body.
B. The circulatory system provides oxygen that the respiratory system uses to fill the lungs
C. The respiratory system provides blood that the circulatory system uses to transport nutrients.
D. They work together to supply oxygen to tissues and rid the body of carbon dioxide
Answer:
The circulatory and respiratory systems work together to circulate blood and oxygen throughout the body. Air moves in and out of the lungs through the trachea, bronchi, and bronchioles. Blood moves in and out of the lungs through the pulmonary arteries and veins that connect to the heart
Explanation:
This should help you out
Define symbol ..........
Answer:
Hey mate here's your answer ⤵️
a mark or character used as a conventional representation of an object, function, or process, e.g. the letter or letters standing for a chemical element or a character in musical notation.
Hope it was helpfulllnoun: letter, character, sign of written communication
Something used for or regarded as representing something else; a material object representing something,
or a character of some kind
Example:
Often something immaterial; emblem, token, or sign: "$"<< the dollar sign is a symbol used to show / means money
Hope this kinda helped
How many atoms of aluminum (Al) are in 3.94 mol of aluminum
Answer:
26.9
Explanation:
that is my answer I try to it
Iron is more reactive than copper. Write an activity to show this. Write word equation of the reaction involved.
Answer:
This can be proved by the following activity: Take some Iron fillings and dip them in the Copper sulphate solution. After some time you will notice that there is a colour change in the solution which is caused due to the displacement of Copper from it solution.
Explanation:
Francium must lose one electron to get a full outer shell. What is the name of the group to which francium belongs
Answer:
Francium (Fr), heaviest chemical element of Group 1 (Ia) in the periodic table, the alkali metal group. It exists only in short-lived radioactive forms.
There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. Francium belongs to alkali metals group.
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.
Francium is a radioactive element, the electronic configuration of Francium is [ R n] 7s¹. The number of electron in outermost shell s is 1. This shows that francium belongs to group 1 of periodic table that is alkali metals.
Therefore, Francium belongs to alkali metals group.
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Which of the following elements can form a covalent (molecular) bond with nitrogen?
A. Oxygen
B. Magnesium
C. Sodium
D. Neon
Oxygen can form a covalent (molecular) bond with nitrogen. Hence, option A is correct.
What is a covalent bond?A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms.
Two covalent bonds form between the two oxygen atoms because oxygen requires two shared electrons to fill its outermost shell.
Nitrogen atoms will form three covalent bonds (also called triple covalent) between two atoms of nitrogen because each nitrogen atom needs three electrons to fill its outermost shell.
Hence, option A is correct.
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⚠️help pls ⚠️
80 kg of element X decays so that 2.5 kilograms remain after 40.35 days.
a.What is the half-life of element X?
b. Identify element x.
C. Write a decay equation for the process.
⚠️WILL GIVE BRAINLIEST⚠️
Answer:
A half life of element is 8.07 days
B iodine 131
C check equation in attached image
Explanation:
80/2 =40
40/2=20
20/2=10
10/2=5
5/2=2.5
After 5 half lives it becomes 2.5 kg
n is the number of half-lives that pass in a given period of time
n= period of time/ half-life
Half life =period of time / n
Half life = 40.35/5= 8.07 days
odine-131 → xenon-131 + beta particle
Plz help!
What must change in order to change the amount of power?
Answer:
Mass
Explanation:
As the radius of a star increases, how do you think its luminosity might change?
Answer:
As the size of a star increases, luminosity increases. If you think about it, a larger star has more surface area. That increased surface area allows more light and energy to be given off.
true or false? no atoms are gained or lost in a chemical reaction
Answer: this is true
The two main postulates that was given by Antoine Lavoisier are, oxygen play an important role in combustion and the other is mass of the reactant and product is conserved. Therefore, the given statement is true.
What is law of conservation of mass?
According to Law of conservation of mass, mass can neither be created nor be destroyed. Mass can only be transformed from one form to another. The law of conservation of mass was given by Antoine Lavoisier. Every reaction in nature follow the law given by Antoine Lavoisier that is mass is always conserved.
According to this law, the number and types of atoms on reactant and product side is same. The statement " no atoms are gained or lost in a chemical reaction" is very much correct.
Therefore, the given statement is true.
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When water is heated a physical change occurs and it forms steam. When a lighted splint is applied to hydrogen gas, a chemical change occurs producing water in the form of steam. Explain how these two statements show two differences between physical and chemical changes.
Answer:
- A new substance was formed in the chemical change while no be substance was formed in the physical change
- The chemical change involved a change in chemical composition while the physical change involved no change in chemical composition
Please find the explanation below.
Explanation:
A physical change is a change that does not alter the chemical content of the substances involved, hence, no new substances are produced while a chemical change alters the chemical composition, hence, new substances results.
In this question,
- Water is heated till it forms steam is characterized as a physical change
- Lighted splint is applied to hydrogen gas to produce water in the form of steam is characterized as a chemical change.
- The first process is a PHYSICAL CHANGE because it involved only a change of state i.e. from liquid to gas, hence, no alteration to the chemical composition of the molecule and also no new substance is produced.
- The second process is a CHEMICAL CHANGE because there was a chemical combination of hydrogen gas and the oxygen in the lighted splint to yield water molecules ( a new substance). Therefore, it involved a chemical reaction and formation of a new substance
What object can an S wave travel through?
-air
-magma
-soil
-water
Answer:
Magma
Explanation: cuz S waves travel through solids water, soil, and air are not solids so ur answer is B; magma
Answer:
c. soil
Explanation:
this is the correct answer not the one above...
What pressure, in atmospheres, is exerted by 0.325 mol of hydrogen gas in a 4.08 L container at 35*C?
Answer: 2.0 atm
Explanation:
PV = nRT
P- the pressure of the gas
V- the volume it occupies
n- the number of moles of gas
R- the universal gas content
T- the absolute temp. of the gas
The pressure, in atmospheres, is exerted by 0.325 mol of hydrogen gas in a 4.08 L container at 35°C is 7.03atm.
What is ideal gas equation?The ideal gas law relates the pressure, volume, temperature, and number of moles of a gas through the equation:
PV = nRT
where P is the pressure in atmospheres, V is the volume in liters (L), n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin (K).
T = 35°C + 273.15 = 308.15 K
Substituting the given values into the ideal gas law equation, we get:
P × 4.08 L = 0.325 mol × 0.08206 × 308.15 K
Simplifying and solving for P, we get:
P = (0.325 mol × 0.08206× 308.15 K) / 4.08 L
P = 7.03 atm
Thus, the pressure exerted by 0.325 mol of hydrogen gas in a 4.08 L container at 35°C is 7.03 atm.
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What is the density of Iodine gas at 2.36 atm and 65.0 °C?
A) 0.026 g/L
B) 0.046 g/L
C) 21.6 g/L
D) 38.3 g/L
Answer:
C
Explanation:
The gas equation can be written as PV = nRT, where
T is in kelvin, so 65 + 273 = 338K
P = 2.36 atm
Mass of Iodine gas = 254 g
R = 0.0821 (gas constant)
So,
P = (2.36*254)/(0.0821*338) = 21.63 g/L
"The density of iodine gas at 2.36 atm and 65.0 °C is 21.63 g/L."
What is density?
A substance's density will be its mass per unit volume. The most common symbol for density is D.
The formula of density can be written as:
D= P×MW/RT
where, P is pressure, MW is molecular weight( MW of iodine is 254) and R is gas constant( 0.082).
Now, put the value of given data in above equation.
D= 2.36×254/0.082×338= 21.63 g/L.
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what information do the coefficients of a balanced equation give about the reactants
which description shows copper at rtp?
Answer:
It is malleable, ductile, and an extremely good conductor of both heat and electricity. It is softer than zinc and can be polished to a bright finish. It is found in group Ib of the periodic table, together with silver and gold. Copper has low chemical reactivity.
Why are we measuring the bubbles to determine the rate of photosynthesis?
Photosynthesis produces glucose and molecular oxygen. The bubbles formed here, is oxygen gas and which can be measured to determine the rate of photosynthesis.
What is photosynthesis?Photosynthesis is a biochemical process by which plants produce energy and oxygen gas with the aid of light. Chlorophyll in green leaves are the photoactive substance which absorbs light energy.
The overall reaction of photosynthesis is written as below:
[tex]\rm 6H_{2}O (l) +6CO_{2} (g) \rightarrow C_{6}H_{6}O_{12}(aq) +6 O_{2} (g)[/tex]
Here, six moles of water and 6 moles of carbon dioxide reacts together to form glucose and 6 moles of oxygen.
The rate of a reaction can be determined by analyzing the product formed at regular interval. Therefore, by measuring the oxygen gas released from photosynthetic reaction in the form of bubbles the rate of reaction can be studied.
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35.46 g silver nitrate reacts with 52.61 g sodium chloride to produce silver chloride and sodium nitrate.
How much silver chloride solid will be produced?
Here are the steps hope it helps
URGENT !! PLEASE ANSWER !!
Is C-O a nonpolar or polar covalent bond? why?
1. What type of element (metal, nonmetal, metalloid) is present that accounts for the flame coloration?
Answer:
Metals i guess
Explanation:
Because each element has an exactly defined line emission spectrum, scientists are able to identify them by the color of flame they produce. For example, copper produces a blue flame, lithium and strontium a red flame, calcium an orange flame, sodium a yellow flame, and barium a green flame.
What voltage will produce 3 A through a circuit that has 15
ohms of resistance?
Answer:
5 ohms of resistance
Explanation:
15/3=5
Look at position 2 on the roller coaster
Is there more potential or kinetic energy , why ?
Which of the following groups of elements has two valence electrons and is highly reactive?
Select one:
a. Alkali metals
b. Alkaline-earth metals
c. Halogens
d. Noble gases
explain why the weight of an object changes if taken to the moon but not its mass
Answer:
Because the gravitational force alters
Explanation:
how dose the scientist know the substances goes through a change of state during the time period labeled B on the graph?
Answer:
The temperature remains constant
Explanation:
In a plot of temperature against time, it is easy to spot the points on the graph where a change of state is taking place.
During a change of state, the temperature does not not change with time. These are points that are plateaus on the temperature-time graph.
This is because, during phase change, the heat that is added is used in breaking intermolecular forces therefore a temperature change is not observed until the phase change is complete.
write down the cell equation. please
Answer:
see explanation
Explanation:
symbiology is (oxidation rxn || reduction rxn)
=> Zn°|Zn⁺² || Cu⁺²|Cu° => Zn°(s) + Cu⁺²(aq) => Zn⁺²(aq) + Cu°(s)
When are kids ready to assume adult responsibilities?
Answer:
18 years old or when they become mature.
Explanation:
Giving brainliest !!!
Answer:
a and i thinkc
Explanation:
Why are prefixes not needed in naming ionic compounds?
Answer:
its A
Explanation:
Answer:
C. Ions combine in only one ratio
Explanation:
Just took the quiz
The chlorophyll processes the ingredients to make
(plant food) and
The chlorophyll processes the ingredients to make
(plant food) and
Answer:
oxygen
Explanation: