Lead Melting
a
Chemical Change
b
Physical Change
Answer:
Melting is an example of physical change.
Explanation:
When react with water, element A shows a mild explosion along with Hydrogen gases produced. Meanwhile, element B shows a spark of fire and duced less Hydrogen gases. Predict the position of element A and B in the periodic table using reactivity trends.
The position of element A is first group i.e. alkali metals whereas element B belongs to other groups.
It is because alkali metals reacts violently with water that leads to little explosion and also produced hydrogen gas while on the other hand, element B belongs to next groups in the periodic table. The reactivity of element A is higher than element B due to lack of one electron in the outermost shell which make it highly reactive as compared to element B which is less reactive in nature.
https://brainly.com/question/24466280
So I had a question which was, What is the charge on a neutron?
A. neutral
Bon positive
C. negative
(Which one of those is right choice?)
Answer:
A. neutral
Explanation:
It's net charge is 0.
Hope it is helpful....Answer:
A. neutral
Explanation:
A neutron is given by formular
[tex]» \: \: {}^{1}_{0}n[/tex]
hence it's net charge is zero
How does chemistry affect sports?
A. Athletes can work out on machines to increase their muscle mass.
B. Data can be collected by à computer to determine a particular
player's strengths.
C. Safety equipment is made of synthetic materials that are
lightweight yet strong.
D. The path of a ball can be predicted using the laws of motion.
Answer:
c
Explanation:
Compare and contrast the three types of mixtures (solutions, colloids, and suspensions).
Answer:
solutions is a homogenous mixture while colloids and suspensions are heterogeneous mixtures made up of 3 or more substances
Explanation:
homogeneous- made up of one thing
heterogeneous- made up of 2 or more things
The solubility of sugar at 30 degree celsius is 22o. what does it mean ?
please help me ..
Answer:
So, that if you put 100 mL of 30 degree water in a beaker, you could add up to 220 grams of sugar and it would eventually dissolve. In other words, that mass of sugar should dissolve in 100 mL of water to make a solution that is just saturated.
From
its position in the periodic table, determine which atom in each pair is more electronegative:
a. Br or Cl
b. N or O
c. S or O
d. P or S
e. Si or N
f. Ba or P
g. N or K
Answer:
a.cl
b.O
c.O
d.S
e.N
f.p
g.N
What is the ability to do work
Answer:
The ability to do work is called energy.
Which of the following is NOT. A property of salt in the ionic and covalent properties lab?
Answer:
im thinking Low melting point
because NaCl (salt has mp 801 degC)
and pretty sure water has mp 0 degC
Explanation:
Which describes a relationship when calculating the energy of a photon? The energy of the photon is directly proportional to frequency. The energy of the photon is inversely proportional to frequency. As the energy of the photon increases, Planck’s constant increases. As the energy of the photon increases, Planck’s constant decreases.
Answer:
The photon is directly proportional to frquency
Explanation:
E=hf
where E is energy
h is plancks constant and
f is frequency
Answer:
A
Explanation:
Edge 2022
I need help ASAP!!!!
Which of these choices describes a solid substance?
A. The volume of the substance depends on the container its in.
B. Volume of the substance changes depending on its location.
C. The shape of the substance changes often.
D. The shape of the substance is fixed and volume is constant.
THIS IS URGENT meant to be due today can someone help out please I’ll brainlist :)!
Hi,
These are the answers
•Question 6. B, Yogurt and sour milk
•Question 7. B, turn litmus paper red
•Question 8. B, used to find pH of a solution
•Question 9. A, names of products and reactants of a chemical reaction in words
•Question 10. B, feel slippery
Hope it help you. Pls mark brainliest if it helped you
conversions please help me with 6 & 7
6.
7. 6 × 7 = 42
42 ÷ 10 = 4,2 Pizzas
You need to buy 4 or 5 Pizzas.
is it correct what I have done
Anss\zyew:yes,the answer is very normal and well done
Is it possible to prove that something is real or true of you can’t directly observe it? If no, why not? If yes, how would you do that?
Answer:
I don't know if you can directly prove it with evidence if you haven't observed it but you can maybe take an educated guess by the aftermath of it?
For example, you see a burnt log. At this time, people don't know what fire is. After we study the log, we could see that it takes extreme temperature in order to burn the log and that would help people see that there is a force like fire that can cause this. In a way, finding out that extreme temperatures burns stuff is another step closer to the discovery and proof of fire
I hope that makes sense
how does bias in the data affect experimental results?
Answer:
Bias can cause the results of a scientific study to be disproportionately weighted in favor of one result or group of subjects. This can cause misunderstandings of natural processes that may make conclusions drawn from the data unreliable.
Explanation:
what is sublimation
Explanation:
Sublimation is the conversion of a substance from the solid to the gaseous state without its becoming liquid. ... Freeze-drying of food to preserve it involves sublimation of water from the food in a frozen state under high vacuum. See also vaporization; phase diagram.
literally anyone pls
Answer:
0.5851 g/cm3
Explanation:
(45.62) ÷ (4.272)³ = 0.5851
Element Z has 2 natural isotopes. One isotope has a mass of 15.0 amu and a relative abundance of 30%. The other isotope has a mass of 16.0 amu. What is the second isotope's relative abundance?
Answer:
70%
Explanation:
Just substract 100 % - 30%
Is it possible to prove that something is real or true of you can’t directly observe it? If no, why not? If yes, how would you do that?
Explain the pH difference between acid and water.
gots another for you guys thanks inn advance
Answer:
c. the center of curvature of the two sides of the lens
Which of the following are testable?
hypotheses
laws
theories
Answer: all of them
Answer:
all the above
Explanation:
Hey! There genius is?
Again am here with questions, which is continuou with yesterday question. Topic, Neutralisation!
Could you spare a moment?
I will really appreciate what you have done on this question's answer.
So All Genius Who Answer This, Complete all the questions.
Thanks!!!!! Open your eye to see my question Genius...........
bye!!!! Catch you later.
Answer:
1. A neutralization reaction is when an acid a base react to form water and salt and involves the combination of H+ ions and OH- negative ions to generate water.
2. starchy refined carbohydrates such as chips, bread, pasta, etc
3.a. brush with fluoride toothpaste after eating or drinking
b. rinse your mouth
c. visit your dentist regularly
d. consider dental sealants
e. drink some tap water
f. avoid frequent snacking and sipping
g.eat tooth- healthy foods
h. consider fluoride treatments
I. ask about antibacterial treatments
j.combined treatments
4. Add diary: the fiery chemical in hot chillies, capsaicin, likes to bound itself onto a compound in milk, which neutralises the burn. Add a generous dollop sour cream, creme fraiche, yogurt or even a touch of milk or cream to spicy foods . For best results tho go with full fat diary.
5.a. Gypsum ( calcium sulphate, CaSo4. 2H2O)
b. baking soda or zinc carbonate
c. lithium hydroxide
d. lemon juice and ordinary vinegar
e.distilled white vin6
19 yards is the same as how many meters?
FeS + ….HNO3 …….……..+ ….H2SO4 + ….NO + ……….
Answer:
hey it's mistake in the question please check it
Which is an example of a polymer?
A. diamond
B. carbon monoxide
C. sodium chloride
D. cellulose
Answer:
[tex]d)cellulose \\ monomer \: is \: glucose \\ thank \: you[/tex]
Answer:
cellulose
Explanation:
cuantos gramos de soluto y solvente tendra 127 gramos de solición cuya concentración es 14% m/m ayuda para resolverlo
banetshegtsjegsgeheb
Cats are aliens send to spy on us. Is the statement printed on this poster about cats scientific theory? Explain your answerr, including whether you can provide evidence to support the statement
Answer:
No, there is no evidence or proof that proves the scientific theory. Therefore, the statement is not a scientific theory.