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Alenkasestr [34]
3 years ago
6

When a substance changes its state, all BUT ONE of these statements is true. That isA)Mass remains constant.

Biology
2 answers:
emmasim [6.3K]3 years ago
7 0
Mass does remain constant. A is true.

Only the form changes. ( I take that means that a solid is different from a liquid) and that is also true.

Kinetic energy changes. This one is kind of iffy. that means that the temperature will change. Temperature is a measurement of KE. If the change is so much as 1 degree or 1/2 a degree or a millionth of a degree, this is true. It's not very likeable though.

The last one is false. Chemical reactions produce new things. State change only produces something going (say) from a liquid to a solid. There's nothing new being created.

Answer D
soldier1979 [14.2K]3 years ago
4 0

During a physical change, a substance changes form or state, matter or mass is conserved. Additionally, the kinetic energy of the particles can increase with heating or decrease with cooling. D) Something new is formed.


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4 0
3 years ago
if the ratio of the ages of kisii and esinam is 3:5 and that of Esinam and Larry is 3:5 and the sum of the ages of all three is
larisa [96]

Answer:

The age difference between the oldest and the youngest is 48.

Explanation:

Given the following data;

The ratio of the ages of Kisii (K) and Esinam (E) is 3:5.

The ratio of the ages of Esinam (E) and Larry (L) is 3:5.

The sum of the ages of all three is 147.

Since the age of Esinam is common in both ratios, we find the lowest common multiple (LCM);

LCM of 3,5 = 15.

Hence, the ratio of the three ages is now;

K:E:L = 9:15:25

Let their ages be denoted by x;

K:E:L = 9x:15x:25x

The sum of all three ages is;

9x + 15x + 25x = 147

49x = 147

x = 147/49

x = 3.

To find the age difference between the oldest and the youngest;

The oldest is Esinam = 25x

The youngest is Kisii = 9x

Therefore, 25x - 9x = 16x

Substituting the value of x, we have;

x = 3; 16x = 16(3) = 48.

The age difference between the oldest and the youngest is 48.

6 0
3 years ago
You are conducting a case control study to determine if an association exists between melanoma and indoor tanning. From a statew
Aleksandr-060686 [28]

Answer:

a. Odds ratio = 1.58

b.  Inasmuch the odds ratio is greater than 1, this means that higher odds of melanoma exist in people exposed to indoor tanning, than in those not exposed to indoor tanning

Explanation:

For case  study                                                  

Let 'a'  represent the total population of people with melanomia = 696                                                      

Let 'b' represent the total number of people with melanomia exposed to indoor tanning  =  1107 – 696 = 411 people

For  control study

Let 'c' represent the total population = 1500

Let 'd' represent the total number of people not exposed to indoor tanning = 1500 - (0.428 * 1500)

                                                          =  1500 - 723

Total number of people not exposed to indoor tanning   = 777 people

                                                       

a. Odds ratio = (a/b) / (d/c) = (696/411) / (777/723)

                                                = 1.69 / 1.07 = 1.58

b. Inasmuch the odds ratio is greater than 1, this means that higher odds of melanoma exist in people exposed to indoor tanning, than in those not exposed to indoor tanning.

7 0
3 years ago
A(n) _____ is a possible explanation or an answer to a question that can be tested.
ValentinkaMS [17]
Im pretty sure its hypothesis

3 0
3 years ago
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