All categories

3 years ago

PLS HELP FOR BRA.INLIEST

Chemistry

2 answers:

Charra [1.4K]3 years ago

4 0

Answer:

D. 100%

Explanation:

T _T_

t | Tt Tt

snow_tiger [21]3 years ago

3 0

C bc the answer is 75

You might be interested in

As you move from row ______ to row ______ in the periodic table, the atomic radius of the elements DECREASES.

Len [333]

Answer:

C) 7 to 1

Explanation:

The periodic trend of Atomic Radii for the Periodic Table of Elements is down and to the left the atomic radii increases.

So, from period 1 to 7 and group 18 to group 1, the atomic radii increases.

The opposite (decreasing) would be from period 7 to 1 and group 1 to group 18.

Therefore, our answer is C.

5 0

3 years ago

A 24% acid solution is mixed with a 14% acid solution to form a 19% acid solution. How many liters of the 24% acid solution are

Kay [80]

Answer: 5 Liters

Explanation:

According to the dilution law,

$M_1V_1+M_2V_2=M_3V_3$

where,

$M_1$ = concentration of first solution = 24%

$V_1$ = volume of first solution = x L

$M_2$ = concentration of second solution = 14%

$V_2$ = volume of second solution = (10-x) L

$M_3$ = concentration of final solution = 19%

$V_2$ = volume of final solution = 10 L

Putting i the values, we get:

$24\times x+14\times (10-x)=19\times 10$

$x=5L$

Therefore, 5 Liters of the 24% acid solution are used to make 10 liters of the 19% acid solution.

4 0

4 years ago

PLS HELP

kipiarov [429]

Answer:

Change in plate tectonic leads to change in earth surfaces.

Plate tectonics have changed Earth’s surface over time because the earth surface is placed on these plate tectonics. Earth's outer surface is divided into various plates that slowly move over the mantle which changes Earth's surface over time by merging and separating of landmasses that turn into continents.

The movement of tectonic plates is responsible for the creation of landforms such as volcanoes and ridges. Some volcanoes are formed when the tectonic plates pull apart from one another whereas some volcanoes are produced when a tectonic plate slides over one another so we can conclude that change in plate tectonic leads to change in earth land forms.

Explanation:

3 0

3 years ago

The colour imparted to a flame by calcium ion?

igor_vitrenko [27]

I not sure, but i know that is soft yellow no white not yellow.

7 0

3 years ago

Classify the following substances as a Bronsted-Lowry acid, Bronsted-Lowry base, Lewis acid, and/or Lewis base.A. HCl, BF_3,B. C

ZanzabumX [31]

Answer:

A. HCl -> Bronsted-Lowry acid, BF3 -> Lewis acid

B. CCl3 -> Lewis acid, -HC -> Lewis acid or Bronsted-Lowry acid

C. H2O -> Bronsted-Lowry acid or Bronsted-Lowry base, CH3Cl -> Lewis base

D.-OCH3 -> Lewis base, NH3 -> Bronsted-Lowry acid or Lewis base.

Explanation:

For the Bronsted-Lowry theory, acids are the substances that can donate a proton H+ and bases are the substances that can receive a pronto H+.

For the Lewis theory, acid is the substance that can gain a pair of electrons, and the base is the substances that can donate the pair of electrons.

A. HCl -> The substance has a proton (H+) and it can donate it, so it's a Bronsted-Lowry acid. BF3 -> The boron (B), still has space in its shells to receive a pair of electrons, so it's a Lewis acid.

B. CCl3 -> The carbon didn't make all the bonds it can do (4), so it still can receive electrons, thus it's a Lewis acid. -HC-> It can lose the proton (H+) as a Bronsted-Lowry acid, os gains a pair of electrons at the carbon, as a Lewis acid.

C. H2O -> It can gain a proton and forms the ion H3O+, or it can lose a proton and form the ion OH-, so it can be a Brosted-Lowy acid or a Bronsted-Lowry base. CH3Cl -> It can donate pair of electrons (the hydrogen is to attached to the carbon, so it will not be lost), so it works as a Lewis base.

D. -OCH3 -> The oxygen still has pairs of electrons, which it can donate, so it's a Lewis base. NH3 -> It can gain a proton and forms the ion NH4+, so it'll be a Bronsted-Lowry acid, but the nitrogen still has electrons, which it can donate, working as a Lewis base.

6 0

3 years ago