how elements are arranged in the groups of periodic table
Answer:
Explanation:
The chemical elements are arranged in order of increasing atomic number. The horizontal rows are called periods and the vertical columns are called groups. Elements in the same group have similar chemical properties. This is because they have the same number of outer electrons and the same valency.
Which statement best describes how deflating a soccer ball is evidence of matter?
a) The ball changes shape from round to flat.
b) The ball increases size and shape.
c) The mass of the ball has increased.
d) The temperature outside the ball has changed.
Answer:
The temperature outside the ball has changed
In an experiment, the one variable that is changed is called the
what is the significance of tempreture to °c?
Calculate the average atomic mass of an element if an isotope with a mass of 55 amu has a natural abundance of 15% and an isotope with a mass of 56 amu has a percentage abundance of 85%. Please show your work and include appropriate units with your answer.
Answer:
Average atomic mass = F
1
M
1
+F
2
M
2
+...+F
n
M
n
Where F
1
,F
2
,...F
n
is the fraction representing the natural abundance of the isotope and M is the weight of the isotope.
Avg. At. Mass = (0.85×11)+(0.10×12)+(0.05×13)
= 9.35+1.2+0.65
Therefore, the average atomic mass = 11.2
I need help please!!!
Answer:
Al has a charge of +3
Cl has -1
So you want al Cl to cancel out the charges
Explanation:
Hence Al=+3
Cl=-1 x 3
Together they have a charge of 0
so The blue is +3
Red is -1
Left green is 1 right green is 3 (these have no sign)
Determine the number of protons, neutrons and electrons in isotopes written in general format and hyphen notation.
The number of protons defines an element. If you know the element, you automatically know the number of protons. The number of protons is the same as the atomic number. A list or periodic table of the elements sorted by atomic number will tell you the number of protons. Example Every oxygen atom has 8 protons.
The number of electrons equals the number of protons in the atom unless it is ionized. The number of electrons is usually considered equal to the number of protons. The number of neutrons depends on the element. These variations in neutron number are called isotopes of the element. Adding the number of protons and the number of neutrons gives the atomic mass. Atomic weights are usually given as numbers following the hyphen after the element name. Example: Oxygen-18. Atomic weights may appear in superscripts before element symbols. Ex 18O. To get the number of neutrons, simply subtract the number of protons from the atomic mass.
Oxygen 17 is oxygen so it has 8 protons and if it is uncharged it probably has 8 choices and 17–8 = 9 neutrons. Similarly, oxygen 18 has 8 protons, 8 electrons and 10 neutrons.
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BALANCE the following equations then write the NET IONIC EQUATION for each one: ____Ni(NO 3 ) 2(aq) + ____NaOH (aq) → _____ Ni(OH) 2(s) + _____ NaNO 3(aq)
Answer:
Ni(NO3)2 + 2NaOH → Ni(OH)2 + 2NaNO3
NET IONIC EQUATION :
Ni +2(aq) + 2(NO3) -1(aq) + 2Na +1(aq) + 2OH -1(aq)
→ Ni(OH)2 (s) + 2Na +1(aq) + 2(NO3) -1(aq)
sorry there is no space to write the reaction in one line...
A strand of DNA has the following order of bases: CGTATGCA. What is the matching ( complimentary) strand
Answer:
GCATACGT
Explanation:
A=T
G=C
C=G
T=A
This key goes with any complementary DNA strand.
Hope this helps you out!
Functionally, the endocrine system is like what other human body system, in that it sends information throughout the body?
A: muscular system
B: skeletal system
C: digestive system
D: nervous system
Answer:
Nervous System
Explanation:
They work together
which two terms describe how waves of dim blue light are different from wave of bright red light
Answer:
A, D
Lower amplitude and Shorter wavelength.
Explanation:
The blue light is having higher frequency and lower wavelength than red light. Red light is the longest wave. Hence, the two terms for blue light compared to red is lower amplitude and shorter wavelength.
What is wavelength ?Wavelength of an electromagnetic wave is the distance between its two consecutive crest or troughs. The wavelength of a wave is inversely proportional to the frequency of the wave.
Frequency of a wave is the number of wave cycles per unit time. As the frequency of the wave increases, its energy increases. Increment in energy generates higher amplitude waves.
However, the dim light has lower amplitude. Higher amplitude make the light brighter. Violet - blue region are shorter wavelength and towards red, wavelength increases.
Therefore, the dim blue light has shorter wavelength and lower amplitude than bright red light.
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1 points)
You have 300 grams of Al2(CO3)3. How many moles are produced?
Answer:
0.5133805136 moles.
Explanation:
1 gram of Al2(Co3)3 equals 0.0017112683785004 moles, we need the amount of moles produced in 300 grams of Al2(CO3)3, so we have to multiply 1 gram of Al2(CO3)3 times 300: 0.0017112683785004 x 300, in conclusion,
300 grams of Al2(Co3)3 equals 0.5133805136.
Which prefix is the smallest?
Answer:could it be kilo
Explanation:it looks like it has the least letters
If an object has a density of 500g/ml and a volume of 50ml, what is its mass?
A.100ml
B.250g
C.55ml
D.45mk
PLEASE HELP ME OUT
The table lists some characteristics of two planets
Mercury Mars
Mass 3.3x10^23kg 6.42x10^23kg
gravity 3.7 m/s^2 3.7 m/s^2
Distance 4879km 6792km
Which statement is true?
A. mars diameter is less than mercury's
B. Objects weight is the same everywhere in the universe
C Mercury and Mars have the same gravitational force.
D. Mars's mass is less than Mercury's
Answer: C
Explanation: Mercury and Mars have the same gravitational force. I got it right
AAAAAAAAAAAAAA MATIAS IS HERERERERE
Answer:
who?? is he a tiktoker?
Explanation:
What happens when a wave hits an object?
A) the wave is reflected
B) the wave continues on
C) the wave is interfered with
D) the wave stops
Answer:
C) the wave is interfered with
Which metal cations form a white precipitate with both H2SO4(aq) and Na2S2O4(aq)? 1. Ba2+ 2. Sr2+ 3. Fe2+ 4. Cu2+
it can be more than 1
Answer:
1. Ba2+ 2. Sr2+
Explanation:
When a solution contains the Barium ,Ba²⁺ ion or Strontium, Sr²⁺ ion, they reacts with either H₂SO₄(aq) or Na₂SO₄(aq) to produce a white precipitate of BaSO₄(s) and SrSO₄(s) respectively
The chemical reactions are given below
Ba²⁺ + H₂SO₄(aq) ⇒ BaSO₄(s) + 2H⁺ (aq)
Ba²⁺ + Na₂SO₄(aq) ⇒ BaSO₄(s) + 2Na⁺ (aq)
Sr²⁺ + H₂SO₄(aq) ⇒ SrSO₄(s) + 2H⁺ (aq)
Sr²⁺ + Na₂SO₄(aq) ⇒ SrSO₄(s) + 2Na⁺ (aq)
What is the order of complexity of solids from least to greatest?
Explanation:
The solids can be classified on the basis of bond they are joined with. There are four types of solids on the basis of bond. There are four type of crystalline solids: namely, molecular solids, network solids, ionic solids, and metallic solids. The molecular and the structure of the solid determines its properties likes conductivity, solibility, heat conductivity, and density. Solids are incompressible and rigid as there molecules are fixed in place.
Answer:
Atoms, Molecules, Extended Structures, and Substances
Explanation:
High arky of solids
(multiple choice) What is the SI unit of mass?
Newton
Gram
Ounce
Pound
I don't understand and I'm getting multiple answers but I have one attempt so please please provide an explanation!!
Answer:
Gram
Explanation:
The SI unit of mass is grams.
Mass is the measure of matter contained in a substance. It is usually determined by weighing an amount of substance on a balance or scale.
Mass is a fundamental quantitySo, the unit of mass is grams. Ounce and pounds are other units but not the standard one. Newton is the unit of force and weight.can mercury turn on a light?
Answer:
Mercury is useful in lighting because it contributes to the bulbs' efficient operation and life expectancy. Fluorescent and other mercury-added bulbs are generally more energy efficient and last longer than incandescent and other equivalent forms of lighting.
Explanation:
Determine the mass of antimony produced when 1.50 grams of antimony(III) oxide reacts.
g Sb
Sb2O3(s) + 3 C(s) --> 2 Sb(s) + 3 CO(g)
**Report your answer to the correct number of significant digits!
Answer:
Mass = 1.217 g
Explanation:
Given data:
Mass of Sb₂O₃ = 1.50 g
Mass of Sb produced = ?
Solution:
Chemical equation:
Sb₂O₃ + 3C → 2Sb + 3CO
Number of moles of Sb₂O₃:
Number of moles = mass/ molar mass
Number of moles = 1.50 g/ 291.49 g/mol
Number of moles = 0.005 mol
now we will compare the moles of Sb₂O₃ and Sb.
Sb₂O₃ : Sb
1 : 2
0.005 : 2/1×0.005 = 0.01
Mass of Sb:
Mass = number of moles × molar mass
Mass = 0.01 mol × 121.76 g/mol
Mass = 1.217 g
Write the empirical formulas for the following compounds:
a) C,H,O,
b)
boron trichloride
c)
methane
d)
CH20.
SOMEONE HELP ME PLEASEEE
Q 1: Fill in the blanks:-
1. Matter is made up of small_________
2. The forces of attraction between the particles are _______ in solids, ______ in liquids and _________ in gases.
3. __________ is the change of gaseous state directly to solid state without going through liquid state, and vice-versa.
4. Evaporation causes __________
5. Latent heat of fusion is the amount of heat energy required to change 1 kg of solid into liquid at its ________
6. Solid, liquid and gas are called the three _______ of matter
7. The smell of perfume gradually spreads across a room due to ______
8. Rapid evaporation depends on the ______ area exposed to atmosphere
9. As the temperature of a system increases, the pressure of the gases ______
10. As the volume of a specific amount of gas decreases, it’s pressure _______
11. Gas molecules at higher temperatures have more _______ than at cooler temperatures.
12. Usually the total charge of a plasma is _______
13. The pressure inside of a sealed tube if you raise the temperature go ______
14. Forces of attraction in liquids are _______ than in solid
15. Liquids that move quickly downhill are described as having _____
16. A mixture contains more than ______ substance mixed in ______ proportion.
17. A solution is defined as a mixture that is----------
18. We can remove salts from a solution by using the process of ----------
19. A pure substance has a fixed__________ or ______ at constant temperature.
20. An element is made up of only one kind of _________.
21. Miscible liquids are separated by ________
22. Immiscible liquids are separated by using a _______
23. Alloy is a _______
24. Sublimation of camphor is a _________ change.
25. Most common chemical change we observe in our routine life is rusting of______.
Answer:
i think there should be some options
Which is a difference between plant and animal cells?
Question 7 options:
An animal cell can produce energy, because it has mitochondria.
A plant cell has a well defined shape, because it has a cell wall.
A plant cell can store genetic information, because it has a nucleus.
Molecules can only pass into an animal cell because it has a cell membrane.
Answer:A plant cell has a well defined shape, because it has a cell wall.
Explanation:
Elements in period 1 are
Answer:
Hydrogen - - helium..
...
Which molecule contains a non polar covalent bond? 1) O=C=O 2) C=O 3) Br-Br 4) CCL4
Answer:
3) Br-Br
Explanation:
Polarity occurs between Two atoms of unequal electronegativities.
since Br-Br contain only one atom ( ie.Bromine), they have equal electronegativity. So they can't be polar.
How many atoms of phosphorus are in 6.00 mol of copper(II) phosphate?
The number of atoms of phosphorus in copper(II) phosphate is 7.23 x 10²⁴ atoms.
What is number of moles?The number of moles of a substance equals the ratio of its given mass in a chemical reaction to the mass of one mole of that substance.
One mole of any substance equals Avogadro's number, that is, 6.023 × 10²³ atoms.
Number of moles of phosphorous in the compoundcopper(II) phosphate is written as Cu₃(PO₄)₂.
1 mole of copper(II) phosphate = 2 moles of phosphorous
6.0 moles of copper(II) phosphate = ?
= 2 x 6
= 12 moles of phosphorous
1 mole of phosphorous = 6.023 x 10²³ atoms
12 moles of phosphorous = ?
= 12 x 6.023 x 10²³
= 7.23 x 10²⁴ atoms.
Thus, the number of atoms of phosphorus in copper(II) phosphate is 7.23 x 10²⁴ atoms.
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When a paper towel absorbs water, is it a physical or chemical change?
Answer:
It is a physical change.
Explanation:
At 5 atmosphere pressure, the volume of a gas is 1200 ml. What pressure is required to reduce
the volume of a gas to 2000 ml without changing the temperature?
Answer:
3 atmExplanation:
The new pressure can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
Since we are finding the new pressure
[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]
From the question we have
[tex]P_2 = \frac{5 \times 1200}{2000} = \frac{6000}{2000} = \frac{6}{2} = 3 \\ [/tex]
We have the final answer as
3 atmHope this helps you