Which of the following is a sign that a physical change has occurred?

Which type of change is this?

Fireworks exploding in the sky undergo a physical change.

Rusting of iron is a _______________ change

Which state of matter does this picture show?

Which of the following signs show that a chemical change has taken place?

A sign of a chemical change on a piece of iron that has an orange colour?

Which is an example of a different substance being formed?

Which substance is used to prove that an unknown gas is carbon dioxide?

What is the function of the teeth in digestion?

人们用发霉的豆腐制作腐乳，这个过程发生了

Which of the following is an example of a chemical change?

一位同学在做小苏打和白醋混合的实验时，将第一勺小苏打加入白醋中，看到杯子中产生气泡，当他加到第四勺小苏打时杯子里不再有气泡产生，这个时候杯子里肯定没有（ ）。

下列不能防止铁生锈的做法是

含有淀粉的物质（比如面包）遇到碘酒会变成

烟花爆炸后消失在天际，说明物质会消失

“春蚕到死丝方尽，蜡炬成灰泪始干”中描述的情景不包括化学变化

Which class of animals is warm-blooded?

用完菜刀后将其清洗并擦干水分再放到干燥的地方，这是为了切断铁和（ ）的接触，以防止生锈这种（ ）的发生

我们的呼吸离不开氧气，大气中的氧气主要是由（ ）制造的。

下列变化中属于化学变化的是

把一根燃烧的火柴伸进刚混合有白醋和小苏打的玻璃杯中，火柴会（ ）

Alex将收集到的二氧化碳气体通入到澄清石灰水中，发现澄清的石灰水变浑浊（生成了白色沉淀），由此可推断该变化为（ ）

金属生锈后，用砂纸把铁锈磨下去，金属就不会再生锈了

红墨水滴入净水中，水的颜色慢慢由透明变成淡红色，这个过程发生了颜色的变化，所以是化学变化

下列食物中，淀粉含量最高的是

导致米饭在口腔内发生化学变化的主要原因是

Most chemical changes cannot be reversed.

What is an example of a physical change?

The chocolate bar in this picture turns into liquid chocolate by ______________

Which group of characteristics are inherited?

Why do children often look like their parents?

Sam is tall, enjoys playing baseball, loves vegetables, and runs track. Which characteristic is inherited from his parents?

Mammals, fish, birds, reptiles and amphibians are all ___.

Which group does it belong to?

What is the major difference between vertebrates and invertebrates?

Animals with fur that give birth to live young are called_____ .

Is the animal a vertebrate or invertebrate?

I am cold blooded, covered in dry scales and I lay eggs. What am I?

Fish take in oxygen through their _______ .

I am cold blooded, covered in scales, use gills to breathe under water, and I lay eggs. What am I?

I am warm blooded, covered in feathers and I lay eggs. What am I?

Which group does it belong to?

Are there more vertebrates or invertebrates on Earth?

I am warm blooded, breathe through my lungs. I have tiny hairs, and give both to live young. I am a(n) ________ .

Jellyfish, spiders, starfish, and worms are ________.

Animals That body temperature changes depending on surrounding is called

Animal that body temperature stays the same all the time is called

Which of the following pets are vertebrates? Check all that apply.

Most fish have _________________ to protect their bodies.

Which of the following statements is true of reptiles?

Invertebrates do NOT have a

Asia keeps seeing a small animal in her backyard. She observed the animal has a backbone, four legs and a long tail, and its body is covered with scales. What is the classification for this animal?

The picture shows a unique animal called a pangolin. The pangolin has scales, is warm-blooded, gives live birth and nurses its young. What group of animals is the pangolin mostlike?

What does classification mean?

If you are creating a classification key for a group of animals found on an island, which

question would not separate turtles and birds?

What uses a series of questions in order to identify unknown plants or animals?

The plant kingdom is divided into two important groups. What are they?