Which statement best explains why chlorine is added to drinking water?
A. Chlorine protects people's teeth against cavities.
B. Chlorine cures infections caused by bacteria or other
microorganisms.
C. Chlorine prepares the body to fight future infections.
D. Chlorine kills most pathogens in water.
SUBMIT
help
Explanation:
D) chlorine kills most pathogens in water.
help on this too please!!
Identify the following ions as cations or anions
Mg=
F=
Zn=
K=
P=
Fe=
O=
What is true of a Brønsted-Lowry base?
A. A Brønsted-Lowry base accepts H+ ions.
B. A Brønsted-Lowry base donates electrons.
C. A Brønsted-Lowry base donates OHions.
D. A Brønsted-Lowry base accepts OH-ions.
Answer:
I think the answer is A sorry if I am wrong :c
A Brønsted-Lowry base is a species that accepts H⁺ ions (A).
What is Brønsted-Lowry theory?It is an acid-base theory.
Brønsted-Lowry acid: is a species that donates H⁺.Brønsted-Lowry base: is a species that accepts H⁺.What is true of a Brønsted-Lowry base?
A. A Brønsted-Lowry base accepts H⁺ ions. True.
B. A Brønsted-Lowry base donates electrons. False. This is a Lewis base.
C. A Brønsted-Lowry base donates OH⁻ ions. False. This is an Arrhenius base.
D. A Brønsted-Lowry base accepts OH⁻ ions. False. This is not part of any acid-base theory.
A Brønsted-Lowry base is a species that accepts H⁺ ions (A).
Learn more about Brønsted-Lowry acid and bases here: https://brainly.com/question/7256753
WILL MARK BRAINLIEST WConsider two elements. Element A has a low ionization
energy of 500 kJ/mol and element B has a high ionization
energy of 1050 kJ/mol. Which element is most likely to form
a positive ion? [Select ]
In which block would you most likely find Element A?
Select)
In which block would you most likely find Element B?
[Select]
Answer:
the one with the lower ionization energy is more likely to be positive as it is easier to remove the valence electron that causes the positive charge
element a is likely in the s block as that is a low ionization energy and they get larger as you move up and to the R in the table
and element b is likely in the p block for the same reason
Explanation:
What is the mass of a boy that weighs 270 N?|
The mass of boy weighing 270 N has been 27.55 kg.
The mass of the object has been determining the quantity of the matter, while weight of the object has been the mass with the gravitational pull.
The weight of the object has been given as:
Weight = mass × gravitational constant
Weight of boy = 270 N
Gravitational constant = 9.8
The mass of boy is:
270 = mass × 9.8
[tex]\rm Mass\;=\;\dfrac{270}{9.8}[/tex]
Mass = 27.55 kg.
The mass of boy weighing 270 N has been 27.55 kg.
For more information about the weight of object, refer to the link:
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What is a mixture called when it has its different components mixed unevenly within the substance?
Heterogeneous mixture
Homogeneous mixture
Impure mixture
Pure mixture
Answer:
When 2 or more pure substances are mixed together they form a mixture. If the mixture has its different components mixed evenly within the substance it is a homogeneous mixture. Whereas if the mixture has its different components mixed unevenly within the substance it is a heterogeneous mixture
Magnetite
Chalcopyrite
Siderite
Heamatite
Which of the following ore doesn't contain iron?
Answer:
Chalcopyrite
Explanation:
Pure magnetite contains 72.4 percent iron, hematite 69.9 percent, limonite 59.8 percent, and siderite 48.2 percent,
What does this weather map symbol represent
A) moving front
B) stationary front
C) cold front
D) warm front
Answer:
B
Explanation:
Blue triangles are a cold front and red bowls are warm front
Stationary front is a combination
HOPE I helped :]
Answer:
stationary front
Explanation:
on a weather map, a stationary front is shown as alternating red semicircles and blue triangles like in the image at the left. notice how the blue triangles point in one direction, and the red semicircles point in the opposite direction.
Fossils can be body parts of ancient organisms, or they can be traces. Give five examples of traces. Help this is due today!!!!!7 grade
Burrows, tracks, coprolites, nests and footprints are examples of traces that can be found in a fossil.
When elements bond, what is the part of the atom doing the bonding?
Answer:
the valance electrons
Explanation:
What's the correct answer?
Answer:
smoother and less jagged
Explanation:
PLS HELP i will give 10 points
In Mendeleev’s Periodic Table, why was there no mention of Noble gases like Helium, Neon and Argon?
Answer:Answer choices are:
A. These elements did not fit in with his pattern.
B. These elements are gases and he didn't include gases.
C. The atoms of these elements had no atomic mass.
D. These elements had not yet been discovered.
___________________________________________________________
Correct answer choice is:
D. These elements had not yet been discovered.
Venus is the second planet from the Sun. It takes about 225 days for it to complete one revolution. What would make Venus have a longer revolution?
if Venus rotated slower
if Venus were closer to the Sun
if Venus rotated faster
if Venus were farther away from the Sun
Answer:
if venus were farther away from the sun
Explanation:
it is because far the planet is long the orbit is which make revolution longer
Which process has the greatest potential for genetic variability?
A.
cell differentiation
B.
interkinesis
C.
meiosis
D.
mitosis
Help ASAP I will mark brainliest for the correct answer !!!⚡️
Answer:
motion
Explanation:
Please help me with this! I’ll mark you brainiest if it’s correct.
I do know it’s either A or C
Answer:
the correct answer is A
Explanation:
All the elements in group 1 react with water to form a hydroxide. What other substance is also
produced?
Cold water causes a strong reaction between all alkali metals. Each reaction results in the release of hydrogen gas and the production of metal hydroxide.
What are alkali metals ?The six chemical elements that make up Group 1 ( Ia ) of the periodic table—lithium ( Li ), sodium ( Na ), potassium ( K ), rubidium ( Rb ), cesium ( Cs ), and francium—are together referred to as alkali metals ( Fr ). The name "alkali metals" refers to how they react with water to produce alkalies.
The elements in Group 1 are all extremely reactive. To protect them against air and water, they must be kept under oil when being stored. Group 1 elements produce alkaline metal hydroxides when they interact with water (with a pH above 7). They are known as "alkali metals" for this reason.
Thus, the elements in group 1 react with water to form a hydroxide and hydrogen gas is produced.
To learn more about alkali metals refer the link below;
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brainiest plsss helpp
Answer:
[tex]\boxed {\boxed {\sf A. \ 19,320 \ kg/m^3}}[/tex]
Explanation:
We want to find the density. The formula is mass over volume.
[tex]\rho = \frac{m}{v}[/tex]
The mass is 500 kilograms. The volume is 0.026 cubic meters.
[tex]m= 500 \ kg \\v=0.026 \ m^3[/tex]
Substitute the values into the formula.
[tex]\rho= \frac{ 500 \ kg}{ 0.026 \ m^3}[/tex]
Divide.
[tex]\rho = 19230.7692 \ kg/m^3[/tex]
This is just about equal to 19,320 kg/m³, so choice A is correct.
Answer:
A) 19230 kg/ m3
Explanation:
divided it's mass by its volume ti get it's density
500/0.026 = 19230
What is the molar mass of NaCrO4?
Answer:
Molar Mass: 138.9818 g/mol
Explanation:
What is the electron configuration for iron?
Answer:
1s2 2s2 2p6 3s2 3p6 4s2 3d6
Explanation:
Mendel also developed the law of
dominance. He did many experiments
with pea plants. This is how he came
up with the law. It shows how certain
traits come to be. One allele is
dominant. It exerts a greater influence.
He based this on an uncertain belief
that each plant carried two trait units.
One of them dominated the other.
Which sentence from this paragraph explains what a dominant allele does?
A. Mendel also developed the law of dominance
B. He did many experiments with pea plants
C. It exerts a greater influence
D. He based this on an uncertain belief that each plant carried two traits
Answer:
They mask the recessive alleles
If the mass of the products of a chemical reaction was 100 g, what was
the mass of the reactants? Explain. -
How many total electrons are transferred in the redox reaction?
Al (s) + Cr(NO3)2 (aq) – Cr (s) + Al(NO3)3 (aq)
A. 2
B. 3
C. 5
D. 6
Answer:
Option D.
Explanation:
Let's balance the hole reaction by the ion electron method.
Al (s) + Cr(NO₃)₂ (aq) – Cr (s) + Al(NO₃)₃ (aq)
We know that oxidation state at ground state is 0.
We determine the half reactions:
Al ⇆ Al³⁺ + 3e⁻
Aluminum increase the oxidation state. This is the oxidation.
Cr²⁺ + 2e⁻ ⇄ Cr
Chromium decrease the oxidation state. It changed from +2 to 0.
This is the reduction. In order to balance the half reactions, we need to multiply by 2 and by 3. In that way, we can cancel the electrons:
(Al ⇆ Al³⁺ + 3e⁻) . 2
(Cr²⁺ + 2e⁻ ⇄ Cr) . 3
We sum the half reactions:
2 Al + 3 Cr²⁺ + 6e⁻ ⇄ 2Al³⁺ + 6e⁻ + 3Cr
We cancel the electrons, so now the balanced reaction is:
2Al + 3Cr(NO₃)₂ → 3Cr + 2Al(NO₃)₃
Final answer: 6 electrons are transferred in the redox reaction.
What holds all the planets and objects in the solar system in place?
Where does it come from?
Answer:
Gravity
Explanation:
i dont rlly know where it comes from...
Which of the following elements exists as a diatomic element?
Neon
Aluminum
Lithium
Nitrogen
Answer:
Nitrogen
Explanation:
because a rule i use called the "en,ne" rule
Any element that ends with this is diatomic
can you pleasehelp me on this
Answer: Trade winds!
Explanation:
What mass of Cl2 can be produced at STP when 3.3 moles of HCl are reacted with excess MnO2?
Which layer over time due to chemical and physical weathering leads to the other layers?
Answer:
chemical weathering occurs on the surface of minerals, the water and acids that control chemical weathering require access to the surface. Physical weathering breaks the rock to provide that surface
1. Which of the following is an Environmental Issue?
(1 Point)
Land Pollution
Water Quality
All of the Above
Answer:Land Population