All categories

3 years ago

A spaceship is traveling through space. Suddenly, its speed increases. What can

Chemistry

1 answer:

asambeis [7]3 years ago

6 0

Answer:

A. The kinetic energy increases as its speed increases.

Explanation:

The kinetic energy of an object is energy possessed by an object by virtue of its motion.

Now, kinetic energy of a moving body is given by;

KE = 1/2 mv^2

Where;

m = mass of the body

v = velocity (speed) of the body

It follows that if the mass of the spaceship is constant, a sudden increase in speed leads to a corresponding increase in the kinetic energy of the spaceship in accordance with the relationship show above.

You might be interested in

How many moles of O2 are needed to react completely with 35.0 mol of 10 points

yKpoI14uk [10]

D.10.0 mol is the correct

4 0

3 years ago

A 50.0-g sample of liquid water at 25.0 Â°c is mixed with 23.0 g of water at 79.0 Â°c. the final temperature of the water is ___

I am Lyosha [343]

m1ΔT1+m2ΔT2=0

m1(Tfl–lT∘1)+m2(Tfl–lT∘2)=0

50.0g×(Tfl–l25.0 °C)+23.0g×(Tfl–l57.0 °C)=0

50.0Tf−1250 °C+23.0Tf – 1311 °C=0

73.0Tf=2561 °C

Tf=2561 °C73.0=35.1 °C

8 0

3 years ago

What is the chemical formula for a compound between Li and Br?

natima [27]

LiBr.

<h3>Explanation</h3>

Note that the group number in this answer refers to the new IUPAC group number, which ranges from 1 to 18. Counts from the left. Start with the first two column (group 1 and 2), go on to the transition elements (Sc, Ti, etc. in group 3 through 12), and continue with the nonmetals (group 13 through 18).

Li is a group 1 metal. As a metal, it tends to form positive ions ("cations"). Metals in group 1 and 2 are main group metals. The charge on main group metal ions tends to be the same as the group number of the metal. Li is in group 1. The charge on an Li ion will be +1. Formula of the Li ion will be $\text{Li}^{+}$ .

Br is a group 17 nonmetal. As a nonmetal, it tends to form negative ions ("anions"). The charge on nonmetal ions excepting for H tends to equal the group number of the nonmetal minus 18. Br is in group 17. The charge on a Br ion will be 17 - 18 = -1. Formula of the Br ion will be $\text{Br}^{-}$

All the ions in an ionic compound carry charge. However, some of the ions like $\text{Li}^+$ are positive. Others ions like $\text{Br}^{-}$ are negative. Charge on the two types of ions balance each other. As a result, the compound is overall neutral.

1 × (+1) + 1 × (-1) = 0. The positive charge on one $\text{Li}^{+}$ ion balances the negative charge on one $\text{Br}^{-}$ ion. The two ions would pair up at a 1:1 ratio.

The empirical formula for an ionic compound shows all the ions in the compound. Positive ions are written in front of negative ions. $\text{Li}^{+}$ is positive and $\text{Br}^{-}$ is negative. The formula shall also show the simplest ratio between the ions. For the compound between Li and Br, a 1:1 ratio will be the simplest. The "1" subscript in an empirical formula can be omitted. Hence the formula: LiBr.

5 0

3 years ago

Given the reaction:

tino4ka555 [31]

4 moles of NaCl is produced from 2 moles of Na₂CrO₄.

Explanation:

Given reaction is

PbCl₂(aq) + Na₂CrO₄(aq)→ PbCrO₄(s) + 2 NaCl (aq)

It is the balanced equation which means that on both sides of the equation, number of atoms of each element are equal.

From the above balanced equation it says that molar ratio of Na₂CrO₄ to NaCl is 1 : 2.

That is 1 mole of Na₂CrO₄ produces 2 moles of NaCl, so the molar ratio is 1:2.

2 moles of Na₂CrO₄ produces 4 moles of NaCl.

So the molar ratio of Na₂CrO₄ to NaCl is 2: 4.

6 0

3 years ago

Which of the following has the greatest electronegativity difference between the bonded atoms? View Available Hint(s) Which of t

Reptile [31]

Answer: A group 1 alkali metal bonded to fluoride, such as LiF.

Explanation:

Electronegativity is defined as the property of an element to attract a shared pair of electron towards itself. The size of an atom increases as we move down the group because a new shell is added and electron gets added up.

1. A strong acid made of hydrogen and a halogen, such as HCl : A polar covalent bond is defined as the bond which is formed when there is a difference of electronegativities between the atoms. Electronegativity difference = electronegativity of chlorine - electronegativity of hydrogen = 3-2.1= 0.9

2. A group 1 alkali metal bonded to fluoride, such as LiF: Ionic bond is formed when there is complete transfer of electron from a highly electropositive metal to a highly electronegative non metal.

Electronegativity difference = electronegativity of fluorine - electronegativity of lithium= 4-1= 3

3. Carbon bonded to a group 6A (16) nonmetal chalcogen, such as in CO: A polar covalent bond is defined as the bond which is formed when there is a difference of electronegativities between the atoms.

Electronegativity difference = electronegativity of oxygen - electronegativity of carbon= 3.5-2.5= 1.0

4. A diatomic gas, such as nitrogen $(N_2)$ : Non-polar covalent bond is defined as the bond which is formed when there is no difference of electronegativities between the atoms.

Electronegativity difference = 0

Thus the greatest electronegativity difference between the bonded atoms is in LiF.

7 0

3 years ago