Answer:
no
Explanation:
In Non-metals
Period - reactivity increases as you go from the left to the right. Group - reactivity decreases as you go down the group
In Metals
Reactivity increases down a group because as nuclear shielding increases and the nucleus' hold on the valence electron weakens, therefore it is easier to remove valence electrons.
Why is it important to pasteurize certain liquids?
Answer:
Pasteurization involves heating liquids at high temperatures for short amounts of time, it can make it better if you wanted hot cocoa but bad for milk
Explanation:
Answer:
Pasteurization kills harmful microbes in milk without affecting the taste or nutritional value
Explanation:
Two liquids A & B are miscible with each other at room temperature. Which separation technique will you apply to separate the mixture of A & B if the difference in their boiling points is 27-degree celsius
Fractional distillation
How many molecules of H2O are in 8.54 moles of H2O?
Select one:
a. 5.14 * 10^24 molecules H2O
b. 2.86 * 10^23 molecules H2O
c. 6.02 * 10^23 molecules H2O
d. 5.14 * 10^23 molecules H2O
Answer:
[tex]\boxed {\boxed {\sf A. \ About \ 5.14 *10^{24} \ molecules \ H_2O}}[/tex]
Explanation:
To convert from moles to units, we must use Avogadro's Number: 6.022 * 10²³
This tells us the number of units (molecules of water in this problem) in 1 mole of a substance (water). We can use it as a ratio or fraction.
[tex]\frac{6.022 *10^{23} \ molecules \ H_2O}{1 \ mol \ H_2 O}[/tex]
Now, we can multiply this fraction by the moles of water (8.54) given.
[tex]8.54 \ mol \ H_2O*\frac{6.022 *10^{23}\ molecules \ H_2O}{1 \ mol \ H_2 O}[/tex]
When we multiply, the moles of water will cancel out.
[tex]8.54 *\frac{6.022 \ molecules \ H_2O}{1 \ }[/tex]
Since the fraction has a 1 as a denominator, we can remove it. The problem will be a simple multiplication problem.
[tex]8.54*6.022 \ molecules \ H_2O[/tex]
[tex]5.142788*10^{24} \ molecules \ H_2O[/tex]
The original measurement of 8.54 has 3 significant figures (8, 5, and 4). Therefore, we must round our answer to 3 sig figs, which is the hundredth place in this case.
The 2 in the thousandth place tells us to leave the 4 in the hundredth place.
[tex]5.14 *10^{24} \ molecules \ H_2 O[/tex]
There are about 5.14*10²⁴ molecules of water in 8.54 moles.
Answer:
5.14 x 10^24 molecules of H2O.
Explanation:
just took the test
When a chemical reaction takes place, the number of atorns of each element in the reactants
nunber of atorms of each element in the products.
will be dferent from
must be equal to
Answer:
The law of conservation of matter says that matter cannot be created or destroyed. In chemical equations, the number of atoms of each element in the reactants must be the same as the number of atoms of each element in the products
Explanation:
What is the value for AG at 100 Kif AH = 27 kJ/mol and AS = 0.09 kJ/(mol-K)?
A. AG = 2700 kJ/mol
B. AG = -36 kJ/mol
C. AG = 0 kJ/mol
D. AG = 18 kJ/mol
Answer:
ΔG = 18KJ/mol
Explanation:
Given data:
ΔS = 0.09 Kj/mol.K
ΔH = 27 KJ/mol
Temperature = 100 K
ΔG = ?
Solution:
Formula:
ΔG = ΔH - TΔS
ΔH = enthalpy
ΔS = entropy
by putting values,
ΔG = 27 KJ/mol - 100K(0.09 Kj/mol.K)
ΔG = 27 KJ/mol - 9 KJ/mol
ΔG = 18KJ/mol
HELP IN 8TH GRADE ADV SCIENCE
Answer:
protons: 36
neutrons: 48
electrons: 36
How did humans create cow breeds that survive well in cold weather?
Select one:
O
They identified cows that did well in cold weather and mated them.
O
They mated cows with sheep that had very thick wool.
O
They mated cows with caribou that tolerated the cold well.
O
They identified cows that did well in hot weather and mated them
Answer: They identified cows that did well in cold weather and mated them. This is known as selective breeding. All the other answers either cannot work as cross-species breeds generally don't work, or they target cows that survive well in hot weather.
Please help me !!!!
Answer:
1) clouds 2) quick 3) near 4) levels 5)nucleus 6) two 7) eight 8) eighteen 9) pairs 10) properties
Explanation:
hope i helped!
Answer:
1. clouds
2. quick
3. near
4. levels
5. nucleus
6. two
7. eight
8. eighteen
9. pairs
10. properties
I do not know if I got 6-8 correctly but I got the other answersHUGE REWARD - 30 POINTS AND BRAINLY!
What is the atomic number of this element?
Answer:
7
Explanation:
ATOMIC NUMBER IS NUMBER OF PROTONS
PROTONS have positive charge
Answer:
7
Explanation:
sorry i accidentally put a 2 first
Which of the following chemical formulas contains the most molecules?
A. 5CO
B. 3H2O
C. 2Fe2O3
D. 4C3H8
Can someone tell me how to identify the number of significant figures?
I solved a molarity word problem and I got the answer 1.138 moles. I need to find the number of significant figures for this number. If you could use 1.138 as an example, that'd be great.
Answer:
Non-zero digits are always significant.
Any zeros between two significant digits are significant.
A final zero or trailing zeros in the decimal portion ONLY are significant. If a number ends in zeros to the right of the decimal point, those zeros are significant.
Explanation:
1.138 has 4 significant figures, which are 1, 1, 3 and 8. The numbers after the decimal point are decimals and are significant figures.
Airplanes typically fly at an altitude of about 10,000 meters. At this altitude the atmospheric pressure is significantly less than it is at sea-level. Because of this, airplane cabins must be pressurized so that the people on board can continue to get enough oxygen. If a typical 747 has a volume of 28,000 m3 and is filled with air at 101.3 kPa on the ground, what is the new volume of air inside when the cabin is pressurized to 75 kPa once it is in flight?
Answer:
37,818.67 m3
Explanation:
The pressure a gas will exert on a container is inversely proportional to the volume of the gas. According to Boyle's law, at a constant temperature, the pressure of a gas is inversely proportional to its volume. The law can be mathematically represented thus:
P1V1 = P2V2
In this case, P1 = 101.3 kPa, V1 = 28,000 m3, P2 = 75 kPa, V2 = ?
V2 = P1V1/P2
= 101.3 x 28,000/75
= 37,818.67 m3
Hence, the new volume of the air inside the cabin after pressurizing would be 37,818.67 m3.
12 blue cups ,9 red cups ,and 14 white cups,
HELP!! I WILL GIVE BRAINLIEST
Earth's magnetic reversals are recorded in
A. the asthenosphere
B. sea-floor rock
C. deep-ocean trenches
D. the mantle
What caused space technology to improve so quickly?
Answer:
“spinoff”
Explanation:
Here is just a sampling of the many “spinoff” technologies, as NASA refers to them, resulting from space research and development that we now use in everyday life.
hhhhhheeeeelpppppp willl give brainliest
Answer:
w = d x f
Explanation:
hope it helps u
what is CdF^4 compound name
Answer:
well it might be 1.)Cadmium Fluoride CdF2 150.4078
2.)Cadmium(II) Perfluorate Cd(FO4) 2278.403
3.)Cadmium Ferrocyanide Cd2Fe(CN) 6436.7714
Explanation:
Is radium usually considered as part of the alkaline earth category in terms of chemistry?
Explanation:
Radium (atomic number 88) has similar properties to barium and is also in the Group 2 category. However, radium is a radioactive element and is generally under the category of radioisotopes in addition to being an alkaline earth metal, because it is not a stable element.
what is love made out of ?
Careless work, fraud, biases, confirmation bias, are all examples of ________________.
Question 10 options:
poor science
good science
higher level science
popular science
Answer:
Poor Science
Explanation:
I took the quiz also just think that doesn't seem like a good, higher level scientist, or popular one, SO THERE YOU GUYS GO!!!
Answer:
poor science
Explanation:
the structural formula for CF4 is
Answer:
PubChem CID 6393
Structure
Find Similar Structures
Chemical Safety
Compressed Gas
Laboratory Chemical Safety Summary (LCSS) Datasheet
Molecular Formula CF4
Molecular Weight
88.004 g/mol
Explanation:
How many grams are in the quantity: 2.5 mol of NaCl
Answer: The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles NaCl, or 58.44277 grams.
Explanation:
Read the clues given below to classify an unknown organism.
Clue 1: A unicellular organism
Clue 2: Lives in the human body
What is the correct classification of the organism?
A. Domain Bacteria; Kingdom Eubacteria
B. Domain Archaea; Kingdom Eubacteria
C. Domain Bacteria; Kingdom Archaebacteria
D. Domain Archaea; Kingdom Archaebacteria
Answer:
c
Explanation:
bacteria can be a single cell and archaebacteria live in the human body
Answer:
c
Explanation:
What is a general rule that you can make that would help you to figure out how to bond ions together
Answer:
metal and non metal-electrovalent
Complete the passage:
During the process of polymerization____
combine by sharing electrons. This process forms a
,____which is made of repeating subunits. The resulting material is used in a variety of ways.
Answer:
During the process of polymerization, monomers
combine by sharing electrons. This process forms a polymer, which is made of repeating subunits. The resulting material is used in a variety of ways.
Answer:
monomers and polymer.
Explanation:
500 mL of He at 98 kPa expands to 750 mL.
500 mL of He at 98 kPa expands to 750 mL. Find P2.
P₂ = 65.3 kPa
Further explanationGiven
V₁=500 ml
P₁=98 kPa
V₂=750 ml
Required
P₂
Solution
Boyle's Law
At a constant temperature, the gas volume is inversely proportional to the pressure applied
[tex]\rm p_1V_1=p_2.V_2\\\\\dfrac{p_1}{p_2}=\dfrac{V_2}{V_1}[/tex]
Input the value :
[tex]\tt P_2=\dfrac{P_1.V_1}{V_2}\\\\P_1=\dfrac{98.500}{750}\\\\P_2=65.3~kPa[/tex]
What is the mass of hydrogen produced when 8.0 g of sodium
reacts with an excess of water to produce hydrogen and sodium
hydroxide? The equation is given.
2 Na + 2 H2O → 2NaOH + H2
Answer:
Mass = 0.35 g
Explanation:
Given data:
Mass of sodium = 8.0 g
Mass of hydrogen produced = ?
Solution:
Chemical equation:
2Na + 2H₂O → 2NaOH + H₂
Number of moles of sodium:
Number of moles = mass/molar mass
Number of moles = 8.0 g/ 23 g/mol
Number of moles = 0.35 mol
now we will compare the moles of sodium and hydrogen
Na : H₂
2 : 1
0.35 : 1/2×0.35 = 0.175 mol
Mass of hydrogen:
Mass = number of moles × molar mass
Mass = 0.175 mol × 2 g/mol
Mass = 0.35 g
Jolene wants to experiment with sugar cubes. Which of the following causes a sugar cube to only change physically, not chemically
An acid that can donate only one hydrogen ion is called a _____ acid.
Answer:monoprotic
Explanation:
15. An increase in atomic number is related to an increase in atomic mass because
a. more electrons are present in the atomic nucleus
b. more electrons are orbiting the atomic nucleus
c. more protons are present in the atomic nucleus
d. more protons are orbiting the atomic nucleus
Answer:
[tex]\boxed {\boxed {\sf C. \ More \ protons \ are \ present \ in \ the \ atomic \ nucleus}}[/tex]
Explanation:
First, let's define atomic number.
⇒ The number of protons in an atom.
⇒ This number determines the identity and properties of the atom
So, atomic number relates to protons. There is an increase in atomic number, so there must be more protons in the atom. We can eliminate choices A and B, because they pertain to electrons.
We are left with choices C and D. The difference between them is the location of the protons.
Protons are part of the nucleus of the atom: the dense, central region of the atom comprised of nucleons: protons and neutrons.
Electrons, not protons, orbit the nucleus, so D is not correct.
We are left with choice C: more protons are present in the atomic nucleus